137b74a387bb3993387029859c2d9d051c41c724eStephen Hines//===- ARMRelocator.cpp --------------------------------------------------===// 25460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// 35460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// The MCLinker Project 45460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// 55460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// This file is distributed under the University of Illinois Open Source 65460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// License. See LICENSE.TXT for details. 75460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// 837b74a387bb3993387029859c2d9d051c41c724eStephen Hines//===----------------------------------------------------------------------===// 937b74a387bb3993387029859c2d9d051c41c724eStephen Hines#include "ARMRelocator.h" 1037b74a387bb3993387029859c2d9d051c41c724eStephen Hines#include "ARMRelocationFunctions.h" 1137b74a387bb3993387029859c2d9d051c41c724eStephen Hines 1237b74a387bb3993387029859c2d9d051c41c724eStephen Hines#include "mcld/IRBuilder.h" 1337b74a387bb3993387029859c2d9d051c41c724eStephen Hines#include "mcld/LinkerConfig.h" 1437b74a387bb3993387029859c2d9d051c41c724eStephen Hines#include "mcld/LD/ELFFileFormat.h" 1537b74a387bb3993387029859c2d9d051c41c724eStephen Hines#include "mcld/LD/LDSymbol.h" 1637b74a387bb3993387029859c2d9d051c41c724eStephen Hines#include "mcld/Object/ObjectBuilder.h" 1737b74a387bb3993387029859c2d9d051c41c724eStephen Hines#include "mcld/Support/MsgHandling.h" 185460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 195460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao#include <llvm/ADT/Twine.h> 205460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao#include <llvm/Support/DataTypes.h> 215460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao#include <llvm/Support/ELF.h> 22affc150dc44fab1911775a49636d0ce85333b634Zonr Chang#include <llvm/Support/Host.h> 235460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 2437b74a387bb3993387029859c2d9d051c41c724eStephen Hinesnamespace mcld { 255460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 2687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines//=========================================// 2787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines// Relocation helper function // 2887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines//=========================================// 2937b74a387bb3993387029859c2d9d051c41c724eStephen Hinesstatic Relocator::DWord getThumbBit(const Relocation& pReloc) { 3087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // Set thumb bit if 3187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // - symbol has type of STT_FUNC, is defined and with bit 0 of its value set 3287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines Relocator::DWord thumbBit = 3337b74a387bb3993387029859c2d9d051c41c724eStephen Hines ((!pReloc.symInfo()->isUndef() || pReloc.symInfo()->isDyn()) && 3437b74a387bb3993387029859c2d9d051c41c724eStephen Hines (pReloc.symInfo()->type() == ResolveInfo::Function) && 3537b74a387bb3993387029859c2d9d051c41c724eStephen Hines ((pReloc.symValue() & 0x1) != 0)) 3637b74a387bb3993387029859c2d9d051c41c724eStephen Hines ? 1 3737b74a387bb3993387029859c2d9d051c41c724eStephen Hines : 0; 3887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines return thumbBit; 3987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines} 4087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 4187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines// Using uint64_t to make sure those complicate operations won't cause 4287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines// undefined behavior. 4337b74a387bb3993387029859c2d9d051c41c724eStephen Hinesstatic uint64_t helper_sign_extend(uint64_t pVal, uint64_t pOri_width) { 4487f34658dec9097d987d254a990ea7f311bfc95fStephen Hines assert(pOri_width <= 64); 4587f34658dec9097d987d254a990ea7f311bfc95fStephen Hines if (pOri_width == 64) 4687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines return pVal; 4787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 4887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines uint64_t mask = (~((uint64_t)0)) >> (64 - pOri_width); 4987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines pVal &= mask; 5087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // Reverse sign bit, then subtract sign bit. 5187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines uint64_t sign_bit = 1 << (pOri_width - 1); 5287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines return (pVal ^ sign_bit) - sign_bit; 5387f34658dec9097d987d254a990ea7f311bfc95fStephen Hines} 5487f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 5537b74a387bb3993387029859c2d9d051c41c724eStephen Hinesstatic uint64_t helper_bit_select(uint64_t pA, uint64_t pB, uint64_t pMask) { 5637b74a387bb3993387029859c2d9d051c41c724eStephen Hines return (pA & ~pMask) | (pB & pMask); 5787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines} 5887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 5987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines// Check if symbol can use relocation R_ARM_RELATIVE 6037b74a387bb3993387029859c2d9d051c41c724eStephen Hinesstatic bool helper_use_relative_reloc(const ResolveInfo& pSym, 6137b74a387bb3993387029859c2d9d051c41c724eStephen Hines const ARMRelocator& pFactory) { 6287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // if symbol is dynamic or undefine or preemptible 6337b74a387bb3993387029859c2d9d051c41c724eStephen Hines if (pSym.isDyn() || pSym.isUndef() || 6487f34658dec9097d987d254a990ea7f311bfc95fStephen Hines pFactory.getTarget().isSymbolPreemptible(pSym)) 6587f34658dec9097d987d254a990ea7f311bfc95fStephen Hines return false; 6687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines return true; 6787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines} 6887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 6987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines// Strip LSB (THUMB bit) if "S" is a THUMB target. 7037b74a387bb3993387029859c2d9d051c41c724eStephen Hinesstatic inline void helper_clear_thumb_bit(Relocator::DWord& pValue) { 7187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines pValue &= (~0x1); 7287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines} 7387f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 7437b74a387bb3993387029859c2d9d051c41c724eStephen Hinesstatic Relocator::Address helper_get_GOT_address(ResolveInfo& pSym, 7537b74a387bb3993387029859c2d9d051c41c724eStephen Hines ARMRelocator& pParent) { 7687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines ARMGOTEntry* got_entry = pParent.getSymGOTMap().lookUp(pSym); 7737b74a387bb3993387029859c2d9d051c41c724eStephen Hines assert(got_entry != NULL); 7887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines return pParent.getTarget().getGOT().addr() + got_entry->getOffset(); 7987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines} 8087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 8137b74a387bb3993387029859c2d9d051c41c724eStephen Hinesstatic ARMGOTEntry& helper_GOT_init(Relocation& pReloc, 8237b74a387bb3993387029859c2d9d051c41c724eStephen Hines bool pHasRel, 8337b74a387bb3993387029859c2d9d051c41c724eStephen Hines ARMRelocator& pParent) { 8487f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // rsym - The relocation target symbol 8587f34658dec9097d987d254a990ea7f311bfc95fStephen Hines ResolveInfo* rsym = pReloc.symInfo(); 8687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines ARMGNULDBackend& ld_backend = pParent.getTarget(); 8737b74a387bb3993387029859c2d9d051c41c724eStephen Hines assert(pParent.getSymGOTMap().lookUp(*rsym) == NULL); 8887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 8987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines ARMGOTEntry* got_entry = ld_backend.getGOT().createGOT(); 9087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines pParent.getSymGOTMap().record(*rsym, *got_entry); 9187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // If we first get this GOT entry, we should initialize it. 9287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines if (!pHasRel) { 9387f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // No corresponding dynamic relocation, initialize to the symbol value. 9487f34658dec9097d987d254a990ea7f311bfc95fStephen Hines got_entry->setValue(ARMRelocator::SymVal); 9537b74a387bb3993387029859c2d9d051c41c724eStephen Hines } else { 9687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // Initialize corresponding dynamic relocation. 9787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines Relocation& rel_entry = *ld_backend.getRelDyn().create(); 9887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines if (rsym->isLocal() || helper_use_relative_reloc(*rsym, pParent)) { 9987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // Initialize got entry to target symbol address 10087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines got_entry->setValue(ARMRelocator::SymVal); 10187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines rel_entry.setType(llvm::ELF::R_ARM_RELATIVE); 10287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines rel_entry.setSymInfo(NULL); 10337b74a387bb3993387029859c2d9d051c41c724eStephen Hines } else { 10487f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // Initialize got entry to 0 for corresponding dynamic relocation. 10587f34658dec9097d987d254a990ea7f311bfc95fStephen Hines got_entry->setValue(0); 10687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines rel_entry.setType(llvm::ELF::R_ARM_GLOB_DAT); 10787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines rel_entry.setSymInfo(rsym); 10887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines } 10987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines rel_entry.targetRef().assign(*got_entry); 11087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines } 11187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines return *got_entry; 11287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines} 11387f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 11437b74a387bb3993387029859c2d9d051c41c724eStephen Hinesstatic Relocator::Address helper_GOT_ORG(ARMRelocator& pParent) { 11587f34658dec9097d987d254a990ea7f311bfc95fStephen Hines return pParent.getTarget().getGOT().addr(); 11687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines} 11787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 11837b74a387bb3993387029859c2d9d051c41c724eStephen Hinesstatic Relocator::Address helper_get_PLT_address(ResolveInfo& pSym, 11937b74a387bb3993387029859c2d9d051c41c724eStephen Hines ARMRelocator& pParent) { 12087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines ARMPLT1* plt_entry = pParent.getSymPLTMap().lookUp(pSym); 12137b74a387bb3993387029859c2d9d051c41c724eStephen Hines assert(plt_entry != NULL); 12287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines return pParent.getTarget().getPLT().addr() + plt_entry->getOffset(); 12387f34658dec9097d987d254a990ea7f311bfc95fStephen Hines} 12487f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 12537b74a387bb3993387029859c2d9d051c41c724eStephen Hinesstatic ARMPLT1& helper_PLT_init(Relocation& pReloc, ARMRelocator& pParent) { 12687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // rsym - The relocation target symbol 12787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines ResolveInfo* rsym = pReloc.symInfo(); 12887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines ARMGNULDBackend& ld_backend = pParent.getTarget(); 12937b74a387bb3993387029859c2d9d051c41c724eStephen Hines assert(pParent.getSymPLTMap().lookUp(*rsym) == NULL); 13087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 13187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // initialize the plt and the corresponding gotplt and dyn relocation 13287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines ARMPLT1* plt_entry = ld_backend.getPLT().create(); 13387f34658dec9097d987d254a990ea7f311bfc95fStephen Hines pParent.getSymPLTMap().record(*rsym, *plt_entry); 13487f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 13537b74a387bb3993387029859c2d9d051c41c724eStephen Hines assert(pParent.getSymGOTPLTMap().lookUp(*rsym) == NULL && 13687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines "PLT entry not exist, but DynRel entry exist!"); 13787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines ARMGOTEntry* gotplt_entry = ld_backend.getGOT().createGOTPLT(); 13887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines pParent.getSymGOTPLTMap().record(*rsym, *gotplt_entry); 13987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 14087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines Relocation& rel_entry = *ld_backend.getRelPLT().create(); 14187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines rel_entry.setType(llvm::ELF::R_ARM_JUMP_SLOT); 14287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines rel_entry.targetRef().assign(*gotplt_entry); 14387f34658dec9097d987d254a990ea7f311bfc95fStephen Hines rel_entry.setSymInfo(rsym); 14487f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 14587f34658dec9097d987d254a990ea7f311bfc95fStephen Hines return *plt_entry; 14687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines} 14787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 14887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines// Get an relocation entry in .rel.dyn and set its type to pType, 14987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines// its FragmentRef to pReloc->targetFrag() and its ResolveInfo to 15087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines// pReloc->symInfo() 15137b74a387bb3993387029859c2d9d051c41c724eStephen Hinesstatic void helper_DynRel_init(Relocation& pReloc, 15237b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::Type pType, 15337b74a387bb3993387029859c2d9d051c41c724eStephen Hines ARMRelocator& pParent) { 15487f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // rsym - The relocation target symbol 15587f34658dec9097d987d254a990ea7f311bfc95fStephen Hines ResolveInfo* rsym = pReloc.symInfo(); 15687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines ARMGNULDBackend& ld_backend = pParent.getTarget(); 15787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 15887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines Relocation& rel_entry = *ld_backend.getRelDyn().create(); 15987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines rel_entry.setType(pType); 16087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines rel_entry.targetRef() = pReloc.targetRef(); 16187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 16287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines if (pType == llvm::ELF::R_ARM_RELATIVE) 16387f34658dec9097d987d254a990ea7f311bfc95fStephen Hines rel_entry.setSymInfo(NULL); 16487f34658dec9097d987d254a990ea7f311bfc95fStephen Hines else 16587f34658dec9097d987d254a990ea7f311bfc95fStephen Hines rel_entry.setSymInfo(rsym); 16687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines} 16787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 16837b74a387bb3993387029859c2d9d051c41c724eStephen Hinesstatic Relocator::DWord helper_extract_movw_movt_addend( 16937b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord pTarget) { 17087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // imm16: [19-16][11-0] 17187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines return helper_sign_extend((((pTarget >> 4)) & 0xf000U) | (pTarget & 0xfffU), 17287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 16); 17387f34658dec9097d987d254a990ea7f311bfc95fStephen Hines} 17487f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 17537b74a387bb3993387029859c2d9d051c41c724eStephen Hinesstatic Relocator::DWord helper_insert_val_movw_movt_inst( 17637b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord pTarget, 17737b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord pImm) { 17887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // imm16: [19-16][11-0] 17987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines pTarget &= 0xfff0f000U; 18087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines pTarget |= pImm & 0x0fffU; 18187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines pTarget |= (pImm & 0xf000U) << 4; 18287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines return pTarget; 18387f34658dec9097d987d254a990ea7f311bfc95fStephen Hines} 18487f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 18537b74a387bb3993387029859c2d9d051c41c724eStephen Hinesstatic Relocator::DWord helper_extract_thumb_movw_movt_addend( 18637b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord pValue) { 18787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // imm16: [19-16][26][14-12][7-0] 18837b74a387bb3993387029859c2d9d051c41c724eStephen Hines return helper_sign_extend( 18937b74a387bb3993387029859c2d9d051c41c724eStephen Hines (((pValue >> 4) & 0xf000U) | ((pValue >> 15) & 0x0800U) | 19037b74a387bb3993387029859c2d9d051c41c724eStephen Hines ((pValue >> 4) & 0x0700U) | (pValue & 0x00ffU)), 19137b74a387bb3993387029859c2d9d051c41c724eStephen Hines 16); 19287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines} 19387f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 19437b74a387bb3993387029859c2d9d051c41c724eStephen Hinesstatic Relocator::DWord helper_insert_val_thumb_movw_movt_inst( 19537b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord pValue, 19637b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord pImm) { 19787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // imm16: [19-16][26][14-12][7-0] 19887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines pValue &= 0xfbf08f00U; 19987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines pValue |= (pImm & 0xf000U) << 4; 20087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines pValue |= (pImm & 0x0800U) << 15; 20187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines pValue |= (pImm & 0x0700U) << 4; 20287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines pValue |= (pImm & 0x00ffU); 20387f34658dec9097d987d254a990ea7f311bfc95fStephen Hines return pValue; 20487f34658dec9097d987d254a990ea7f311bfc95fStephen Hines} 20587f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 20637b74a387bb3993387029859c2d9d051c41c724eStephen Hinesstatic Relocator::DWord helper_thumb32_branch_offset( 20737b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord pUpper16, 20837b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord pLower16) { 20937b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord s = (pUpper16 & (1U << 10)) >> 10, // 26 bit 21037b74a387bb3993387029859c2d9d051c41c724eStephen Hines u = pUpper16 & 0x3ffU, // 25-16 21137b74a387bb3993387029859c2d9d051c41c724eStephen Hines l = pLower16 & 0x7ffU, // 10-0 21237b74a387bb3993387029859c2d9d051c41c724eStephen Hines j1 = (pLower16 & (1U << 13)) >> 13, // 13 21337b74a387bb3993387029859c2d9d051c41c724eStephen Hines j2 = (pLower16 & (1U << 11)) >> 11; // 11 21437b74a387bb3993387029859c2d9d051c41c724eStephen Hines 21537b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord i1 = j1 ^ s ? 0 : 1, i2 = j2 ^ s ? 0 : 1; 21687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 21787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // [31-25][24][23][22][21-12][11-1][0] 21887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // 0 s i1 i2 u l 0 21937b74a387bb3993387029859c2d9d051c41c724eStephen Hines return helper_sign_extend( 22037b74a387bb3993387029859c2d9d051c41c724eStephen Hines (s << 24) | (i1 << 23) | (i2 << 22) | (u << 12) | (l << 1), 25); 22187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines} 22287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 22337b74a387bb3993387029859c2d9d051c41c724eStephen Hinesstatic Relocator::DWord helper_thumb32_branch_upper(Relocator::DWord pUpper16, 22437b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord pOffset) { 22587f34658dec9097d987d254a990ea7f311bfc95fStephen Hines uint32_t sign = ((pOffset & 0x80000000U) >> 31); 22687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines return (pUpper16 & ~0x7ffU) | ((pOffset >> 12) & 0x3ffU) | (sign << 10); 22787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines} 22887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 22937b74a387bb3993387029859c2d9d051c41c724eStephen Hinesstatic Relocator::DWord helper_thumb32_branch_lower(Relocator::DWord pLower16, 23037b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord pOffset) { 23187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines uint32_t sign = ((pOffset & 0x80000000U) >> 31); 23237b74a387bb3993387029859c2d9d051c41c724eStephen Hines return ((pLower16 & ~0x2fffU) | ((((pOffset >> 23) & 1) ^ !sign) << 13) | 23337b74a387bb3993387029859c2d9d051c41c724eStephen Hines ((((pOffset >> 22) & 1) ^ !sign) << 11) | ((pOffset >> 1) & 0x7ffU)); 23487f34658dec9097d987d254a990ea7f311bfc95fStephen Hines} 23587f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 23637b74a387bb3993387029859c2d9d051c41c724eStephen Hinesstatic Relocator::DWord helper_thumb32_cond_branch_offset( 23737b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord pUpper16, 23837b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord pLower16) { 23987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines uint32_t s = (pUpper16 & 0x0400U) >> 10; 24087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines uint32_t j1 = (pLower16 & 0x2000U) >> 13; 24187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines uint32_t j2 = (pLower16 & 0x0800U) >> 11; 24287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines uint32_t lower = (pLower16 & 0x07ffU); 24387f34658dec9097d987d254a990ea7f311bfc95fStephen Hines uint32_t upper = (s << 8) | (j2 << 7) | (j1 << 6) | (pUpper16 & 0x003fU); 24487f34658dec9097d987d254a990ea7f311bfc95fStephen Hines return helper_sign_extend((upper << 12) | (lower << 1), 21); 24587f34658dec9097d987d254a990ea7f311bfc95fStephen Hines} 24687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 24737b74a387bb3993387029859c2d9d051c41c724eStephen Hinesstatic Relocator::DWord helper_thumb32_cond_branch_upper( 24837b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord pUpper16, 24937b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord pOffset) { 25087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines uint32_t sign = ((pOffset & 0x80000000U) >> 31); 25187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines return (pUpper16 & 0xfbc0U) | (sign << 10) | ((pOffset & 0x0003f000U) >> 12); 25287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines} 25387f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 25437b74a387bb3993387029859c2d9d051c41c724eStephen Hinesstatic Relocator::DWord helper_thumb32_cond_branch_lower( 25537b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord pLower16, 25637b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord pOffset) { 25787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines uint32_t j2 = (pOffset & 0x00080000U) >> 19; 25887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines uint32_t j1 = (pOffset & 0x00040000U) >> 18; 25987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines uint32_t lo = (pOffset & 0x00000ffeU) >> 1; 26087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines return (pLower16 & 0xd000U) | (j1 << 13) | (j2 << 11) | lo; 26187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines} 26287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 26387f34658dec9097d987d254a990ea7f311bfc95fStephen Hines// Return true if overflow 26437b74a387bb3993387029859c2d9d051c41c724eStephen Hinesstatic bool helper_check_signed_overflow(Relocator::DWord pValue, 26537b74a387bb3993387029859c2d9d051c41c724eStephen Hines unsigned bits) { 26687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines int32_t signed_val = static_cast<int32_t>(pValue); 26787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines int32_t max = (1 << (bits - 1)) - 1; 26887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines int32_t min = -(1 << (bits - 1)); 26987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines if (signed_val > max || signed_val < min) { 27087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines return true; 27187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines } else { 27287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines return false; 27387f34658dec9097d987d254a990ea7f311bfc95fStephen Hines } 27487f34658dec9097d987d254a990ea7f311bfc95fStephen Hines} 27587f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 27637b74a387bb3993387029859c2d9d051c41c724eStephen Hines//===----------------------------------------------------------------------===// 27767e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao// Relocation Functions and Tables 27837b74a387bb3993387029859c2d9d051c41c724eStephen Hines//===----------------------------------------------------------------------===// 2795460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei LiaoDECL_ARM_APPLY_RELOC_FUNCS 2805460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 28167e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao/// the prototype of applying function 282d0fbbb227051be16931a1aa9b4a7722ac039c698Shih-wei Liaotypedef Relocator::Result (*ApplyFunctionType)(Relocation& pReloc, 283d0fbbb227051be16931a1aa9b4a7722ac039c698Shih-wei Liao ARMRelocator& pParent); 28467e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao 28567e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao// the table entry of applying functions 28637b74a387bb3993387029859c2d9d051c41c724eStephen Hinesstruct ApplyFunctionTriple { 28767e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao ApplyFunctionType func; 28867e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao unsigned int type; 28967e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao const char* name; 29067e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao}; 29167e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao 29267e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao// declare the table of applying functions 29367e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liaostatic const ApplyFunctionTriple ApplyFunctions[] = { 29437b74a387bb3993387029859c2d9d051c41c724eStephen Hines DECL_ARM_APPLY_RELOC_FUNC_PTRS}; 29567e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao 29637b74a387bb3993387029859c2d9d051c41c724eStephen Hines//===----------------------------------------------------------------------===// 297d0fbbb227051be16931a1aa9b4a7722ac039c698Shih-wei Liao// ARMRelocator 29837b74a387bb3993387029859c2d9d051c41c724eStephen Hines//===----------------------------------------------------------------------===// 299f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen HinesARMRelocator::ARMRelocator(ARMGNULDBackend& pParent, 300f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines const LinkerConfig& pConfig) 30137b74a387bb3993387029859c2d9d051c41c724eStephen Hines : Relocator(pConfig), m_Target(pParent) { 3025460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 3035460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 30437b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::~ARMRelocator() { 3055460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 3065460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 30737b74a387bb3993387029859c2d9d051c41c724eStephen HinesRelocator::Result ARMRelocator::applyRelocation(Relocation& pRelocation) { 3085460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao Relocation::Type type = pRelocation.type(); 30937b74a387bb3993387029859c2d9d051c41c724eStephen Hines if (type > 130) { // 131-255 doesn't noted in ARM spec 310d0fbbb227051be16931a1aa9b4a7722ac039c698Shih-wei Liao return Relocator::Unknown; 3115460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 3125460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 31322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao return ApplyFunctions[type].func(pRelocation, *this); 3145460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 3155460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 31637b74a387bb3993387029859c2d9d051c41c724eStephen Hinesconst char* ARMRelocator::getName(Relocator::Type pType) const { 31767e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao return ApplyFunctions[pType].name; 31867e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao} 3195460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 32037b74a387bb3993387029859c2d9d051c41c724eStephen HinesRelocator::Size ARMRelocator::getSize(Relocation::Type pType) const { 3216f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines return 32; 3226f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines} 3236f75755c9204b1d8817ae5a65a2f7e5af0ec3f70Stephen Hines 32437b74a387bb3993387029859c2d9d051c41c724eStephen Hinesvoid ARMRelocator::addCopyReloc(ResolveInfo& pSym) { 32587f34658dec9097d987d254a990ea7f311bfc95fStephen Hines Relocation& rel_entry = *getTarget().getRelDyn().create(); 326f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines rel_entry.setType(llvm::ELF::R_ARM_COPY); 327f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines assert(pSym.outSymbol()->hasFragRef()); 328f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines rel_entry.targetRef().assign(*pSym.outSymbol()->fragRef()); 329f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines rel_entry.setSymInfo(&pSym); 330f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines} 331f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 332f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines/// defineSymbolForCopyReloc 333f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines/// For a symbol needing copy relocation, define a copy symbol in the BSS 334f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines/// section and all other reference to this symbol should refer to this 335f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines/// copy. 336f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines/// This is executed at scan relocation stage. 33737b74a387bb3993387029859c2d9d051c41c724eStephen HinesLDSymbol& ARMRelocator::defineSymbolforCopyReloc(IRBuilder& pBuilder, 33837b74a387bb3993387029859c2d9d051c41c724eStephen Hines const ResolveInfo& pSym) { 339f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // get or create corresponding BSS LDSection 340f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines LDSection* bss_sect_hdr = NULL; 341f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines ELFFileFormat* file_format = getTarget().getOutputFormat(); 342f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (ResolveInfo::ThreadLocal == pSym.type()) 343f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines bss_sect_hdr = &file_format->getTBSS(); 344f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines else 345f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines bss_sect_hdr = &file_format->getBSS(); 346f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 347f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // get or create corresponding BSS SectionData 348f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines SectionData* bss_data = NULL; 349f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (bss_sect_hdr->hasSectionData()) 350f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines bss_data = bss_sect_hdr->getSectionData(); 351f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines else 352f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines bss_data = IRBuilder::CreateSectionData(*bss_sect_hdr); 353f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 354f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // Determine the alignment by the symbol value 355f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // FIXME: here we use the largest alignment 356f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines uint32_t addralign = config().targets().bitclass() / 8; 357f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 358f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // allocate space in BSS for the copy symbol 359f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines Fragment* frag = new FillFragment(0x0, 1, pSym.size()); 36037b74a387bb3993387029859c2d9d051c41c724eStephen Hines uint64_t size = ObjectBuilder::AppendFragment(*frag, *bss_data, addralign); 361f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines bss_sect_hdr->setSize(bss_sect_hdr->size() + size); 362f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 363f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // change symbol binding to Global if it's a weak symbol 364f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines ResolveInfo::Binding binding = (ResolveInfo::Binding)pSym.binding(); 365f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (binding == ResolveInfo::Weak) 366f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines binding = ResolveInfo::Global; 367f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 368f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // Define the copy symbol in the bss section and resolve it 369f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines LDSymbol* cpy_sym = pBuilder.AddSymbol<IRBuilder::Force, IRBuilder::Resolve>( 37037b74a387bb3993387029859c2d9d051c41c724eStephen Hines pSym.name(), 37137b74a387bb3993387029859c2d9d051c41c724eStephen Hines (ResolveInfo::Type)pSym.type(), 37237b74a387bb3993387029859c2d9d051c41c724eStephen Hines ResolveInfo::Define, 37337b74a387bb3993387029859c2d9d051c41c724eStephen Hines binding, 37437b74a387bb3993387029859c2d9d051c41c724eStephen Hines pSym.size(), // size 37537b74a387bb3993387029859c2d9d051c41c724eStephen Hines 0x0, // value 37637b74a387bb3993387029859c2d9d051c41c724eStephen Hines FragmentRef::Create(*frag, 0x0), 37737b74a387bb3993387029859c2d9d051c41c724eStephen Hines (ResolveInfo::Visibility)pSym.other()); 378f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines return *cpy_sym; 379f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines} 380f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 381f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines/// checkValidReloc - When we attempt to generate a dynamic relocation for 382f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines/// ouput file, check if the relocation is supported by dynamic linker. 38337b74a387bb3993387029859c2d9d051c41c724eStephen Hinesvoid ARMRelocator::checkValidReloc(Relocation& pReloc) const { 384f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // If not PIC object, no relocation type is invalid 385f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (!config().isCodeIndep()) 386f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines return; 387f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 38837b74a387bb3993387029859c2d9d051c41c724eStephen Hines switch (pReloc.type()) { 389f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_RELATIVE: 390f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_COPY: 391f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_GLOB_DAT: 392f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_JUMP_SLOT: 393f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_ABS32: 394f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_ABS32_NOI: 395f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_PC24: 396f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_TLS_DTPMOD32: 397f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_TLS_DTPOFF32: 398f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_TLS_TPOFF32: 399f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines break; 400f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 401f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines default: 40237b74a387bb3993387029859c2d9d051c41c724eStephen Hines error(diag::non_pic_relocation) << getName(pReloc.type()) 403f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines << pReloc.symInfo()->name(); 404f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines break; 405f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines } 406f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines} 407f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 40837b74a387bb3993387029859c2d9d051c41c724eStephen Hinesbool ARMRelocator::mayHaveFunctionPointerAccess( 40937b74a387bb3993387029859c2d9d051c41c724eStephen Hines const Relocation& pReloc) const { 4100dea6bc96bb52346737966839ac68644f7939f58Stephen Hines switch (pReloc.type()) { 4110dea6bc96bb52346737966839ac68644f7939f58Stephen Hines case llvm::ELF::R_ARM_PC24: 4120dea6bc96bb52346737966839ac68644f7939f58Stephen Hines case llvm::ELF::R_ARM_THM_CALL: 4130dea6bc96bb52346737966839ac68644f7939f58Stephen Hines case llvm::ELF::R_ARM_PLT32: 4140dea6bc96bb52346737966839ac68644f7939f58Stephen Hines case llvm::ELF::R_ARM_CALL: 4150dea6bc96bb52346737966839ac68644f7939f58Stephen Hines case llvm::ELF::R_ARM_JUMP24: 4160dea6bc96bb52346737966839ac68644f7939f58Stephen Hines case llvm::ELF::R_ARM_THM_JUMP24: 4170dea6bc96bb52346737966839ac68644f7939f58Stephen Hines case llvm::ELF::R_ARM_SBREL31: 4180dea6bc96bb52346737966839ac68644f7939f58Stephen Hines case llvm::ELF::R_ARM_PREL31: 4190dea6bc96bb52346737966839ac68644f7939f58Stephen Hines case llvm::ELF::R_ARM_THM_JUMP19: 4200dea6bc96bb52346737966839ac68644f7939f58Stephen Hines case llvm::ELF::R_ARM_THM_JUMP6: 4210dea6bc96bb52346737966839ac68644f7939f58Stephen Hines case llvm::ELF::R_ARM_THM_JUMP11: 4220dea6bc96bb52346737966839ac68644f7939f58Stephen Hines case llvm::ELF::R_ARM_THM_JUMP8: { 4230dea6bc96bb52346737966839ac68644f7939f58Stephen Hines return false; 4240dea6bc96bb52346737966839ac68644f7939f58Stephen Hines } 42537b74a387bb3993387029859c2d9d051c41c724eStephen Hines default: { return true; } 4260dea6bc96bb52346737966839ac68644f7939f58Stephen Hines } 4270dea6bc96bb52346737966839ac68644f7939f58Stephen Hines} 4280dea6bc96bb52346737966839ac68644f7939f58Stephen Hines 42937b74a387bb3993387029859c2d9d051c41c724eStephen Hinesvoid ARMRelocator::scanLocalReloc(Relocation& pReloc, 43037b74a387bb3993387029859c2d9d051c41c724eStephen Hines const LDSection& pSection) { 431f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // rsym - The relocation target symbol 432f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines ResolveInfo* rsym = pReloc.symInfo(); 433f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 43437b74a387bb3993387029859c2d9d051c41c724eStephen Hines switch (pReloc.type()) { 435f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // Set R_ARM_TARGET1 to R_ARM_ABS32 436f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // FIXME: R_ARM_TARGET1 should be set by option --target1-rel 437f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // or --target1-rel 438f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_TARGET1: 43937b74a387bb3993387029859c2d9d051c41c724eStephen Hines pReloc.setType(llvm::ELF::R_ARM_ABS32); 440f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_ABS32: 441f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_ABS32_NOI: { 442f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // If buiding PIC object (shared library or PIC executable), 443f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // a dynamic relocations with RELATIVE type to this location is needed. 444f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // Reserve an entry in .rel.dyn 445f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (config().isCodeIndep()) { 44687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines helper_DynRel_init(pReloc, llvm::ELF::R_ARM_RELATIVE, *this); 447f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // set Rel bit 448f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines rsym->setReserved(rsym->reserved() | ReserveRel); 449f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines getTarget().checkAndSetHasTextRel(*pSection.getLink()); 450f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines } 451f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines return; 452f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines } 453f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 454f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_ABS16: 455f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_ABS12: 456f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_THM_ABS5: 457f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_ABS8: 458f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_BASE_ABS: 459f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_MOVW_ABS_NC: 460f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_MOVT_ABS: 461f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_THM_MOVW_ABS_NC: 462f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_THM_MOVT_ABS: { 463f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // PIC code should not contain these kinds of relocation 464f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (config().isCodeIndep()) { 46537b74a387bb3993387029859c2d9d051c41c724eStephen Hines error(diag::non_pic_relocation) << getName(pReloc.type()) 466f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines << pReloc.symInfo()->name(); 467f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines } 468f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines return; 469f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines } 470f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_GOTOFF32: 471f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_GOTOFF12: { 472f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // FIXME: A GOT section is needed 473f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines return; 474f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines } 475f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 476f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // Set R_ARM_TARGET2 to R_ARM_GOT_PREL 477f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // FIXME: R_ARM_TARGET2 should be set by option --target2 478f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_TARGET2: 479f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines pReloc.setType(llvm::ELF::R_ARM_GOT_PREL); 480f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_GOT_BREL: 481f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_GOT_PREL: { 482f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // A GOT entry is needed for these relocation type. 483f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // return if we already create GOT for this symbol 48487f34658dec9097d987d254a990ea7f311bfc95fStephen Hines if (rsym->reserved() & ReserveGOT) 485f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines return; 48687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 487f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // If building PIC object, a dynamic relocation with 488f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // type RELATIVE is needed to relocate this GOT entry. 48987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines if (config().isCodeIndep()) 49037b74a387bb3993387029859c2d9d051c41c724eStephen Hines helper_GOT_init(pReloc, true, *this); 49187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines else 49237b74a387bb3993387029859c2d9d051c41c724eStephen Hines helper_GOT_init(pReloc, false, *this); 493f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // set GOT bit 49487f34658dec9097d987d254a990ea7f311bfc95fStephen Hines rsym->setReserved(rsym->reserved() | ReserveGOT); 495f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines return; 496f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines } 497f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 498f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_BASE_PREL: { 499f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // FIXME: Currently we only support R_ARM_BASE_PREL against 500f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // symbol _GLOBAL_OFFSET_TABLE_ 501f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (rsym != getTarget().getGOTSymbol()->resolveInfo()) 50237b74a387bb3993387029859c2d9d051c41c724eStephen Hines fatal(diag::base_relocation) << static_cast<int>(pReloc.type()) 50337b74a387bb3993387029859c2d9d051c41c724eStephen Hines << rsym->name() 504f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines << "mclinker@googlegroups.com"; 505f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines return; 506f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines } 507f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_COPY: 508f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_GLOB_DAT: 509f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_JUMP_SLOT: 510f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_RELATIVE: { 511f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // These are relocation type for dynamic linker, shold not 512f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // appear in object file. 51337b74a387bb3993387029859c2d9d051c41c724eStephen Hines fatal(diag::dynamic_relocation) << static_cast<int>(pReloc.type()); 514f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines break; 515f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines } 51637b74a387bb3993387029859c2d9d051c41c724eStephen Hines default: { break; } 51737b74a387bb3993387029859c2d9d051c41c724eStephen Hines } // end switch 518f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines} 519f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 520f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hinesvoid ARMRelocator::scanGlobalReloc(Relocation& pReloc, 521f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines IRBuilder& pBuilder, 52237b74a387bb3993387029859c2d9d051c41c724eStephen Hines const LDSection& pSection) { 523f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // rsym - The relocation target symbol 524f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines ResolveInfo* rsym = pReloc.symInfo(); 525f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 52637b74a387bb3993387029859c2d9d051c41c724eStephen Hines switch (pReloc.type()) { 527f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // Set R_ARM_TARGET1 to R_ARM_ABS32 528f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // FIXME: R_ARM_TARGET1 should be set by option --target1-rel 529f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // or --target1-rel 530f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_TARGET1: 531f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines pReloc.setType(llvm::ELF::R_ARM_ABS32); 532f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_ABS32: 533f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_ABS16: 534f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_ABS12: 535f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_THM_ABS5: 536f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_ABS8: 537f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_BASE_ABS: 538f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_MOVW_ABS_NC: 539f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_MOVT_ABS: 540f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_THM_MOVW_ABS_NC: 541f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_THM_MOVT_ABS: 542f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_ABS32_NOI: { 543f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // Absolute relocation type, symbol may needs PLT entry or 544f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // dynamic relocation entry 545f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (getTarget().symbolNeedsPLT(*rsym)) { 546f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // create plt for this symbol if it does not have one 54737b74a387bb3993387029859c2d9d051c41c724eStephen Hines if (!(rsym->reserved() & ReservePLT)) { 548f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // Symbol needs PLT entry, we need to reserve a PLT entry 549f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // and the corresponding GOT and dynamic relocation entry 55087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // in .got and .rel.plt. 55187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines helper_PLT_init(pReloc, *this); 552f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // set PLT bit 553f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines rsym->setReserved(rsym->reserved() | ReservePLT); 554f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines } 555f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines } 556f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 55737b74a387bb3993387029859c2d9d051c41c724eStephen Hines if (getTarget() 55837b74a387bb3993387029859c2d9d051c41c724eStephen Hines .symbolNeedsDynRel( 55937b74a387bb3993387029859c2d9d051c41c724eStephen Hines *rsym, (rsym->reserved() & ReservePLT), true)) { 560f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (getTarget().symbolNeedsCopyReloc(pReloc, *rsym)) { 561f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines LDSymbol& cpy_sym = defineSymbolforCopyReloc(pBuilder, *rsym); 562f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines addCopyReloc(*cpy_sym.resolveInfo()); 56337b74a387bb3993387029859c2d9d051c41c724eStephen Hines } else { 564f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines checkValidReloc(pReloc); 565f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // set Rel bit 56687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines if (helper_use_relative_reloc(*rsym, *this)) 56787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines helper_DynRel_init(pReloc, llvm::ELF::R_ARM_RELATIVE, *this); 56887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines else 56987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines helper_DynRel_init(pReloc, pReloc.type(), *this); 570f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines rsym->setReserved(rsym->reserved() | ReserveRel); 571f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines getTarget().checkAndSetHasTextRel(*pSection.getLink()); 572f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines } 573f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines } 574f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines return; 575f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines } 576f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 577f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_GOTOFF32: 578f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_GOTOFF12: { 579f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // FIXME: A GOT section is needed 580f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines return; 581f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines } 582f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 583f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_BASE_PREL: 584f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_THM_MOVW_BREL_NC: 585f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_THM_MOVW_BREL: 586f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_THM_MOVT_BREL: 587f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // FIXME: Currently we only support these relocations against 588f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // symbol _GLOBAL_OFFSET_TABLE_ 589f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (rsym != getTarget().getGOTSymbol()->resolveInfo()) { 59037b74a387bb3993387029859c2d9d051c41c724eStephen Hines fatal(diag::base_relocation) << static_cast<int>(pReloc.type()) 59137b74a387bb3993387029859c2d9d051c41c724eStephen Hines << rsym->name() 592f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines << "mclinker@googlegroups.com"; 593f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines } 594f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_REL32: 595f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_LDR_PC_G0: 596f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_SBREL32: 597f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_THM_PC8: 598f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_MOVW_PREL_NC: 599f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_MOVT_PREL: 600f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_THM_MOVW_PREL_NC: 601f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_THM_MOVT_PREL: 602f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_THM_ALU_PREL_11_0: 603f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_THM_PC12: 604f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_REL32_NOI: 605f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_ALU_PC_G0_NC: 606f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_ALU_PC_G0: 607f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_ALU_PC_G1_NC: 608f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_ALU_PC_G1: 609f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_ALU_PC_G2: 610f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_LDR_PC_G1: 611f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_LDR_PC_G2: 612f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_LDRS_PC_G0: 613f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_LDRS_PC_G1: 614f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_LDRS_PC_G2: 615f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_LDC_PC_G0: 616f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_LDC_PC_G1: 617f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_LDC_PC_G2: 618f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_ALU_SB_G0_NC: 619f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_ALU_SB_G0: 620f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_ALU_SB_G1_NC: 621f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_ALU_SB_G1: 622f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_ALU_SB_G2: 623f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_LDR_SB_G0: 624f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_LDR_SB_G1: 625f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_LDR_SB_G2: 626f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_LDRS_SB_G0: 627f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_LDRS_SB_G1: 628f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_LDRS_SB_G2: 629f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_LDC_SB_G0: 630f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_LDC_SB_G1: 631f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_LDC_SB_G2: 632f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_MOVW_BREL_NC: 633f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_MOVT_BREL: 634f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_MOVW_BREL: { 635f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // Relative addressing relocation, may needs dynamic relocation 63637b74a387bb3993387029859c2d9d051c41c724eStephen Hines if (getTarget() 63737b74a387bb3993387029859c2d9d051c41c724eStephen Hines .symbolNeedsDynRel( 63837b74a387bb3993387029859c2d9d051c41c724eStephen Hines *rsym, (rsym->reserved() & ReservePLT), false)) { 639f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // symbol needs dynamic relocation entry, reserve an entry in .rel.dyn 640f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (getTarget().symbolNeedsCopyReloc(pReloc, *rsym)) { 641f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines LDSymbol& cpy_sym = defineSymbolforCopyReloc(pBuilder, *rsym); 642f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines addCopyReloc(*cpy_sym.resolveInfo()); 64337b74a387bb3993387029859c2d9d051c41c724eStephen Hines } else { 644f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines checkValidReloc(pReloc); 645f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // set Rel bit 64637b74a387bb3993387029859c2d9d051c41c724eStephen Hines helper_DynRel_init(pReloc, pReloc.type(), *this); 647f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines rsym->setReserved(rsym->reserved() | ReserveRel); 648f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines getTarget().checkAndSetHasTextRel(*pSection.getLink()); 649f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines } 650f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines } 651f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines return; 652f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines } 653f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 654f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_PC24: 655f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_THM_CALL: 656f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_PLT32: 657f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_CALL: 658f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_JUMP24: 659f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_THM_JUMP24: 660f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_SBREL31: 661f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_PREL31: 662f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_THM_JUMP19: 663f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_THM_JUMP6: 664f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_THM_JUMP11: 665f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_THM_JUMP8: { 666f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // These are branch relocation (except PREL31) 667f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // A PLT entry is needed when building shared library 668f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 669f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // return if we already create plt for this symbol 670f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (rsym->reserved() & ReservePLT) 671f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines return; 672f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 673f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // if the symbol's value can be decided at link time, then no need plt 674f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (getTarget().symbolFinalValueIsKnown(*rsym)) 675f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines return; 676f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 677f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // if symbol is defined in the ouput file and it's not 678f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // preemptible, no need plt 679f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (rsym->isDefine() && !rsym->isDyn() && 680f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines !getTarget().isSymbolPreemptible(*rsym)) { 681f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines return; 682f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines } 683f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 684f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // Symbol needs PLT entry, we need to reserve a PLT entry 685f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // and the corresponding GOT and dynamic relocation entry 68687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // in .got and .rel.plt. 68787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines helper_PLT_init(pReloc, *this); 688f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // set PLT bit 689f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines rsym->setReserved(rsym->reserved() | ReservePLT); 690f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines return; 691f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines } 692f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 693f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // Set R_ARM_TARGET2 to R_ARM_GOT_PREL 694f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // FIXME: R_ARM_TARGET2 should be set by option --target2 695f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_TARGET2: 696f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines pReloc.setType(llvm::ELF::R_ARM_GOT_PREL); 697f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_GOT_BREL: 698f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_GOT_ABS: 699f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_GOT_PREL: { 700f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // Symbol needs GOT entry, reserve entry in .got 701f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // return if we already create GOT for this symbol 70287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines if (rsym->reserved() & ReserveGOT) 703f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines return; 704f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // if the symbol cannot be fully resolved at link time, then we need a 705f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // dynamic relocation 70687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines if (!getTarget().symbolFinalValueIsKnown(*rsym)) 70787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines helper_GOT_init(pReloc, true, *this); 70887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines else 70987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines helper_GOT_init(pReloc, false, *this); 710f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // set GOT bit 711f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines rsym->setReserved(rsym->reserved() | ReserveGOT); 712f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines return; 713f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines } 714f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 715f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_COPY: 716f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_GLOB_DAT: 717f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_JUMP_SLOT: 718f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines case llvm::ELF::R_ARM_RELATIVE: { 719f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // These are relocation type for dynamic linker, shold not 720f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // appear in object file. 72137b74a387bb3993387029859c2d9d051c41c724eStephen Hines fatal(diag::dynamic_relocation) << static_cast<int>(pReloc.type()); 722f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines break; 723f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines } 72437b74a387bb3993387029859c2d9d051c41c724eStephen Hines default: { break; } 72537b74a387bb3993387029859c2d9d051c41c724eStephen Hines } // end switch 726f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines} 727f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 728f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hinesvoid ARMRelocator::scanRelocation(Relocation& pReloc, 729f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines IRBuilder& pBuilder, 730f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines Module& pModule, 73187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines LDSection& pSection, 73237b74a387bb3993387029859c2d9d051c41c724eStephen Hines Input& pInput) { 733f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // rsym - The relocation target symbol 734f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines ResolveInfo* rsym = pReloc.symInfo(); 73537b74a387bb3993387029859c2d9d051c41c724eStephen Hines assert(rsym != NULL && 736f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines "ResolveInfo of relocation not set while scanRelocation"); 737f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 73837b74a387bb3993387029859c2d9d051c41c724eStephen Hines assert(pSection.getLink() != NULL); 73937b74a387bb3993387029859c2d9d051c41c724eStephen Hines if ((pSection.getLink()->flag() & llvm::ELF::SHF_ALLOC) == 0) 740f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines return; 741f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 742f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // Scan relocation type to determine if an GOT/PLT/Dynamic Relocation 743f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // entries should be created. 744f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // FIXME: Below judgements concern nothing about TLS related relocation 745f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 746f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // rsym is local 747f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (rsym->isLocal()) 748f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines scanLocalReloc(pReloc, pSection); 749f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 750f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // rsym is external 751f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines else 752f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines scanGlobalReloc(pReloc, pBuilder, pSection); 753f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 754f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // check if we shoule issue undefined reference for the relocation target 755f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // symbol 756f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (rsym->isUndef() && !rsym->isDyn() && !rsym->isWeak() && !rsym->isNull()) 75787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines issueUndefRef(pReloc, pSection, pInput); 7585460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 7595460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 76037b74a387bb3993387029859c2d9d051c41c724eStephen Hinesuint32_t ARMRelocator::getDebugStringOffset(Relocation& pReloc) const { 76137b74a387bb3993387029859c2d9d051c41c724eStephen Hines if (pReloc.type() != llvm::ELF::R_ARM_ABS32) 76237b74a387bb3993387029859c2d9d051c41c724eStephen Hines error(diag::unsupport_reloc_for_debug_string) 76337b74a387bb3993387029859c2d9d051c41c724eStephen Hines << getName(pReloc.type()) << "mclinker@googlegroups.com"; 76437b74a387bb3993387029859c2d9d051c41c724eStephen Hines 76537b74a387bb3993387029859c2d9d051c41c724eStephen Hines if (pReloc.symInfo()->type() == ResolveInfo::Section) 76637b74a387bb3993387029859c2d9d051c41c724eStephen Hines return pReloc.target(); 76737b74a387bb3993387029859c2d9d051c41c724eStephen Hines else 76837b74a387bb3993387029859c2d9d051c41c724eStephen Hines return pReloc.symInfo()->outSymbol()->fragRef()->offset() + 76937b74a387bb3993387029859c2d9d051c41c724eStephen Hines pReloc.target() + pReloc.addend(); 77037b74a387bb3993387029859c2d9d051c41c724eStephen Hines} 77137b74a387bb3993387029859c2d9d051c41c724eStephen Hines 77237b74a387bb3993387029859c2d9d051c41c724eStephen Hinesvoid ARMRelocator::applyDebugStringOffset(Relocation& pReloc, 77337b74a387bb3993387029859c2d9d051c41c724eStephen Hines uint32_t pOffset) { 77437b74a387bb3993387029859c2d9d051c41c724eStephen Hines pReloc.target() = pOffset; 77537b74a387bb3993387029859c2d9d051c41c724eStephen Hines} 77637b74a387bb3993387029859c2d9d051c41c724eStephen Hines 7775460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao//=========================================// 7785460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// Each relocation function implementation // 7795460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao//=========================================// 7805460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 7815460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// R_ARM_NONE 78237b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::Result none(Relocation& pReloc, ARMRelocator& pParent) { 783551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 7845460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 7855460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 7865460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// R_ARM_ABS32: (S + A) | T 78737b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::Result abs32(Relocation& pReloc, ARMRelocator& pParent) { 7885460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao ResolveInfo* rsym = pReloc.symInfo(); 789551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord T = getThumbBit(pReloc); 790551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord A = pReloc.target() + pReloc.addend(); 791551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord S = pReloc.symValue(); 792f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (T != 0x0) 793f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines helper_clear_thumb_bit(S); 7945460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 79537b74a387bb3993387029859c2d9d051c41c724eStephen Hines // If the flag of target section is not ALLOC, we will not scan this 79637b74a387bb3993387029859c2d9d051c41c724eStephen Hines // relocation 797affc150dc44fab1911775a49636d0ce85333b634Zonr Chang // but perform static relocation. (e.g., applying .debug section) 79837b74a387bb3993387029859c2d9d051c41c724eStephen Hines if ((llvm::ELF::SHF_ALLOC & 79937b74a387bb3993387029859c2d9d051c41c724eStephen Hines pReloc.targetRef().frag()->getParent()->getSection().flag()) == 0) { 800affc150dc44fab1911775a49636d0ce85333b634Zonr Chang pReloc.target() = (S + A) | T; 801551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 802affc150dc44fab1911775a49636d0ce85333b634Zonr Chang } 803affc150dc44fab1911775a49636d0ce85333b634Zonr Chang 804affc150dc44fab1911775a49636d0ce85333b634Zonr Chang // An external symbol may need PLT and dynamic relocation 805affc150dc44fab1911775a49636d0ce85333b634Zonr Chang if (!rsym->isLocal()) { 806f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (rsym->reserved() & ARMRelocator::ReservePLT) { 80787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines S = helper_get_PLT_address(*rsym, pParent); 80837b74a387bb3993387029859c2d9d051c41c724eStephen Hines T = 0; // PLT is not thumb 8095460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 8105460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // If we generate a dynamic relocation (except R_ARM_RELATIVE) 8115460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // for a place, we should not perform static relocation on it 8125460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // in order to keep the addend store in the place correct. 81387f34658dec9097d987d254a990ea7f311bfc95fStephen Hines if ((rsym->reserved() & ARMRelocator::ReserveRel) && 81487f34658dec9097d987d254a990ea7f311bfc95fStephen Hines (!helper_use_relative_reloc(*rsym, pParent))) 815551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 8165460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 8175460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 8185460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // perform static relocation 8195460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao pReloc.target() = (S + A) | T; 820551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 8215460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 8225460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 8235460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// R_ARM_REL32: ((S + A) | T) - P 82437b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::Result rel32(Relocation& pReloc, ARMRelocator& pParent) { 8255460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // perform static relocation 826551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::Address S = pReloc.symValue(); 82737b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord T = getThumbBit(pReloc); 82837b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord A = pReloc.target() + pReloc.addend(); 82922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 83087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // An external symbol may need PLT (this reloc is from a stub/veneer) 83122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (!pReloc.symInfo()->isLocal()) { 832f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (pReloc.symInfo()->reserved() & ARMRelocator::ReservePLT) { 83387f34658dec9097d987d254a990ea7f311bfc95fStephen Hines S = helper_get_PLT_address(*pReloc.symInfo(), pParent); 83422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao T = 0; // PLT is not thumb. 83522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 83622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao } 83722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 83887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines if (T != 0x0) 83987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines helper_clear_thumb_bit(S); 84087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 84122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // perform relocation 84222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao pReloc.target() = ((S + A) | T) - pReloc.place(); 84322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 844551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 8455460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 8465460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 8475460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// R_ARM_BASE_PREL: B(S) + A - P 84837b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::Result base_prel(Relocation& pReloc, ARMRelocator& pParent) { 8495460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // perform static relocation 850551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord A = pReloc.target() + pReloc.addend(); 85122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao pReloc.target() = pReloc.symValue() + A - pReloc.place(); 852551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 8535460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 8545460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 8555460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// R_ARM_GOTOFF32: ((S + A) | T) - GOT_ORG 85637b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::Result gotoff32(Relocation& pReloc, ARMRelocator& pParent) { 857551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord T = getThumbBit(pReloc); 858551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord A = pReloc.target() + pReloc.addend(); 859551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::Address GOT_ORG = helper_GOT_ORG(pParent); 860551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::Address S = pReloc.symValue(); 861f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (T != 0x0) 862f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines helper_clear_thumb_bit(S); 8635460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 8645460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao pReloc.target() = ((S + A) | T) - GOT_ORG; 865551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 8665460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 8675460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 8685460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// R_ARM_GOT_BREL: GOT(S) + A - GOT_ORG 86937b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::Result got_brel(Relocation& pReloc, ARMRelocator& pParent) { 87087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines if (!(pReloc.symInfo()->reserved() & ARMRelocator::ReserveGOT)) 871551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::BadReloc; 87287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 873551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::Address GOT_S = helper_get_GOT_address(*pReloc.symInfo(), pParent); 87437b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord A = pReloc.target() + pReloc.addend(); 875551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::Address GOT_ORG = helper_GOT_ORG(pParent); 8765460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // Apply relocation. 8775460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao pReloc.target() = GOT_S + A - GOT_ORG; 87887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 87987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // setup got entry value if needed 88087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines ARMGOTEntry* got_entry = pParent.getSymGOTMap().lookUp(*pReloc.symInfo()); 88137b74a387bb3993387029859c2d9d051c41c724eStephen Hines if (got_entry != NULL && ARMRelocator::SymVal == got_entry->getValue()) 88287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines got_entry->setValue(pReloc.symValue()); 883551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 8845460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 8855460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 8865460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// R_ARM_GOT_PREL: GOT(S) + A - P 88737b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::Result got_prel(Relocation& pReloc, ARMRelocator& pParent) { 88887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines if (!(pReloc.symInfo()->reserved() & ARMRelocator::ReserveGOT)) { 889551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::BadReloc; 8905460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 891551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::Address GOT_S = helper_get_GOT_address(*pReloc.symInfo(), pParent); 89237b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord A = pReloc.target() + pReloc.addend(); 89337b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::Address P = pReloc.place(); 89422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 8955460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // Apply relocation. 8965460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao pReloc.target() = GOT_S + A - P; 89787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 89887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // setup got entry value if needed 89987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines ARMGOTEntry* got_entry = pParent.getSymGOTMap().lookUp(*pReloc.symInfo()); 90037b74a387bb3993387029859c2d9d051c41c724eStephen Hines if (got_entry != NULL && ARMRelocator::SymVal == got_entry->getValue()) 90187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines got_entry->setValue(pReloc.symValue()); 902551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 9035460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 9045460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 9050dea6bc96bb52346737966839ac68644f7939f58Stephen Hines// R_ARM_THM_JUMP8: S + A - P 90637b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::Result thm_jump8(Relocation& pReloc, ARMRelocator& pParent) { 9070dea6bc96bb52346737966839ac68644f7939f58Stephen Hines Relocator::DWord P = pReloc.place(); 90837b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord A = 90937b74a387bb3993387029859c2d9d051c41c724eStephen Hines helper_sign_extend((pReloc.target() & 0x00ff) << 1, 8) + pReloc.addend(); 9100dea6bc96bb52346737966839ac68644f7939f58Stephen Hines // S depends on PLT exists or not 9110dea6bc96bb52346737966839ac68644f7939f58Stephen Hines Relocator::Address S = pReloc.symValue(); 9120dea6bc96bb52346737966839ac68644f7939f58Stephen Hines if (pReloc.symInfo()->reserved() & ARMRelocator::ReservePLT) 9130dea6bc96bb52346737966839ac68644f7939f58Stephen Hines S = helper_get_PLT_address(*pReloc.symInfo(), pParent); 9140dea6bc96bb52346737966839ac68644f7939f58Stephen Hines 9150dea6bc96bb52346737966839ac68644f7939f58Stephen Hines Relocator::DWord X = S + A - P; 9160dea6bc96bb52346737966839ac68644f7939f58Stephen Hines if (helper_check_signed_overflow(X, 9)) 9170dea6bc96bb52346737966839ac68644f7939f58Stephen Hines return Relocator::Overflow; 9180dea6bc96bb52346737966839ac68644f7939f58Stephen Hines // Make sure the Imm is 0. Result Mask. 9190dea6bc96bb52346737966839ac68644f7939f58Stephen Hines pReloc.target() = (pReloc.target() & 0xFFFFFF00u) | ((X & 0x01FEu) >> 1); 9200dea6bc96bb52346737966839ac68644f7939f58Stephen Hines return Relocator::OK; 9210dea6bc96bb52346737966839ac68644f7939f58Stephen Hines} 9220dea6bc96bb52346737966839ac68644f7939f58Stephen Hines 923f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines// R_ARM_THM_JUMP11: S + A - P 92437b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::Result thm_jump11(Relocation& pReloc, ARMRelocator& pParent) { 925551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord P = pReloc.place(); 92637b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord A = 92737b74a387bb3993387029859c2d9d051c41c724eStephen Hines helper_sign_extend((pReloc.target() & 0x07ff) << 1, 11) + pReloc.addend(); 928f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // S depends on PLT exists or not 929551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::Address S = pReloc.symValue(); 930f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (pReloc.symInfo()->reserved() & ARMRelocator::ReservePLT) 93187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines S = helper_get_PLT_address(*pReloc.symInfo(), pParent); 932f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 933551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord X = S + A - P; 9340dea6bc96bb52346737966839ac68644f7939f58Stephen Hines if (helper_check_signed_overflow(X, 12)) 935551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::Overflow; 936f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // Make sure the Imm is 0. Result Mask. 937f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines pReloc.target() = (pReloc.target() & 0xFFFFF800u) | ((X & 0x0FFEu) >> 1); 938551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 939f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines} 940f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines 94187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines// R_ARM_THM_JUMP19: ((S + A) | T) - P 94237b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::Result thm_jump19(Relocation& pReloc, ARMRelocator& pParent) { 94387f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // get lower and upper 16 bit instructions from relocation targetData 94487f34658dec9097d987d254a990ea7f311bfc95fStephen Hines uint16_t upper_inst = *(reinterpret_cast<uint16_t*>(&pReloc.target())); 94587f34658dec9097d987d254a990ea7f311bfc95fStephen Hines uint16_t lower_inst = *(reinterpret_cast<uint16_t*>(&pReloc.target()) + 1); 94687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 947551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord T = getThumbBit(pReloc); 94837b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord A = 94937b74a387bb3993387029859c2d9d051c41c724eStephen Hines helper_thumb32_cond_branch_offset(upper_inst, lower_inst); 950551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::Address P = pReloc.place(); 951551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::Address S; 95287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // if symbol has plt 95387f34658dec9097d987d254a990ea7f311bfc95fStephen Hines if (pReloc.symInfo()->reserved() & ARMRelocator::ReservePLT) { 95487f34658dec9097d987d254a990ea7f311bfc95fStephen Hines S = helper_get_PLT_address(*pReloc.symInfo(), pParent); 95587f34658dec9097d987d254a990ea7f311bfc95fStephen Hines T = 0; // PLT is not thumb. 95637b74a387bb3993387029859c2d9d051c41c724eStephen Hines } else { 95787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines S = pReloc.symValue(); 95887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines if (T != 0x0) 95987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines helper_clear_thumb_bit(S); 96087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines } 96187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 96237b74a387bb3993387029859c2d9d051c41c724eStephen Hines if (T == 0x0) { 96387f34658dec9097d987d254a990ea7f311bfc95fStephen Hines // FIXME: conditional branch to PLT in THUMB-2 not supported yet 96437b74a387bb3993387029859c2d9d051c41c724eStephen Hines error(diag::unsupported_cond_branch_reloc) 96537b74a387bb3993387029859c2d9d051c41c724eStephen Hines << static_cast<int>(pReloc.type()); 966551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::BadReloc; 96787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines } 96887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 969551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord X = ((S + A) | T) - P; 97087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines if (helper_check_signed_overflow(X, 21)) 971551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::Overflow; 97287f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 97387f34658dec9097d987d254a990ea7f311bfc95fStephen Hines upper_inst = helper_thumb32_cond_branch_upper(upper_inst, X); 97487f34658dec9097d987d254a990ea7f311bfc95fStephen Hines lower_inst = helper_thumb32_cond_branch_lower(lower_inst, X); 97587f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 97687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines *(reinterpret_cast<uint16_t*>(&pReloc.target())) = upper_inst; 97787f34658dec9097d987d254a990ea7f311bfc95fStephen Hines *(reinterpret_cast<uint16_t*>(&pReloc.target()) + 1) = lower_inst; 97887f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 979551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 98087f34658dec9097d987d254a990ea7f311bfc95fStephen Hines} 98187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines 982f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines// R_ARM_PC24: ((S + A) | T) - P 9835460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// R_ARM_PLT32: ((S + A) | T) - P 9845460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// R_ARM_JUMP24: ((S + A) | T) - P 9855460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// R_ARM_CALL: ((S + A) | T) - P 98637b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::Result call(Relocation& pReloc, ARMRelocator& pParent) { 9875460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // If target is undefined weak symbol, we only need to jump to the 988affc150dc44fab1911775a49636d0ce85333b634Zonr Chang // next instruction unless it has PLT entry. Rewrite instruction 989affc150dc44fab1911775a49636d0ce85333b634Zonr Chang // to NOP. 99037b74a387bb3993387029859c2d9d051c41c724eStephen Hines if (pReloc.symInfo()->isWeak() && pReloc.symInfo()->isUndef() && 991affc150dc44fab1911775a49636d0ce85333b634Zonr Chang !pReloc.symInfo()->isDyn() && 992f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines !(pReloc.symInfo()->reserved() & ARMRelocator::ReservePLT)) { 9935460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // change target to NOP : mov r0, r0 9945460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao pReloc.target() = (pReloc.target() & 0xf0000000U) | 0x01a00000; 995551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 9965460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 9975460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 99837b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord T = getThumbBit(pReloc); 99937b74a387bb3993387029859c2d9d051c41c724eStephen Hines Relocator::DWord A = 100037b74a387bb3993387029859c2d9d051c41c724eStephen Hines helper_sign_extend((pReloc.target() & 0x00FFFFFFu) << 2, 26) + 100137b74a387bb3993387029859c2d9d051c41c724eStephen Hines pReloc.addend(); 1002551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::Address P = pReloc.place(); 1003551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::Address S = pReloc.symValue(); 1004f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (T != 0x0) 1005f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines helper_clear_thumb_bit(S); 10065460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 1007f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // S depends on PLT exists or not 1008f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (pReloc.symInfo()->reserved() & ARMRelocator::ReservePLT) { 100987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines S = helper_get_PLT_address(*pReloc.symInfo(), pParent); 10105460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao T = 0; // PLT is not thumb. 10115460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 10125460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 101322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // At this moment (after relaxation), if the jump target is thumb instruction, 101422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // switch mode is needed, rewrite the instruction to BLX 101522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // FIXME: check if we can use BLX instruction (check from .ARM.attribute 101622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // CPU ARCH TAG, which should be ARMv5 or above) 1017affc150dc44fab1911775a49636d0ce85333b634Zonr Chang if (T != 0) { 101822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // cannot rewrite to blx for R_ARM_JUMP24 101922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (pReloc.type() == llvm::ELF::R_ARM_JUMP24) 1020551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::BadReloc; 1021f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (pReloc.type() == llvm::ELF::R_ARM_PC24) 1022551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::BadReloc; 102322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 102437b74a387bb3993387029859c2d9d051c41c724eStephen Hines pReloc.target() = 102537b74a387bb3993387029859c2d9d051c41c724eStephen Hines (pReloc.target() & 0xffffff) | 0xfa000000 | (((S + A - P) & 2) << 23); 10265460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 1027affc150dc44fab1911775a49636d0ce85333b634Zonr Chang 1028551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord X = ((S + A) | T) - P; 10295460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // Check X is 24bit sign int. If not, we should use stub or PLT before apply. 103067e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao if (helper_check_signed_overflow(X, 26)) 1031551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::Overflow; 10325460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // Make sure the Imm is 0. Result Mask. 10335460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao pReloc.target() = (pReloc.target() & 0xFF000000u) | ((X & 0x03FFFFFEu) >> 2); 1034551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 10355460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 10365460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 10375460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// R_ARM_THM_CALL: ((S + A) | T) - P 1038f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines// R_ARM_THM_JUMP24: ((S + A) | T) - P 103937b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::Result thm_call(Relocation& pReloc, ARMRelocator& pParent) { 10405460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // If target is undefined weak symbol, we only need to jump to the 1041affc150dc44fab1911775a49636d0ce85333b634Zonr Chang // next instruction unless it has PLT entry. Rewrite instruction 1042affc150dc44fab1911775a49636d0ce85333b634Zonr Chang // to NOP. 104337b74a387bb3993387029859c2d9d051c41c724eStephen Hines if (pReloc.symInfo()->isWeak() && pReloc.symInfo()->isUndef() && 1044affc150dc44fab1911775a49636d0ce85333b634Zonr Chang !pReloc.symInfo()->isDyn() && 1045f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines !(pReloc.symInfo()->reserved() & ARMRelocator::ReservePLT)) { 10465460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao pReloc.target() = (0xe000U << 16) | 0xbf00U; 1047551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 10485460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 10495460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 1050affc150dc44fab1911775a49636d0ce85333b634Zonr Chang // get lower and upper 16 bit instructions from relocation targetData 105122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint16_t upper_inst = *(reinterpret_cast<uint16_t*>(&pReloc.target())); 105222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint16_t lower_inst = *(reinterpret_cast<uint16_t*>(&pReloc.target()) + 1); 10535460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 1054551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord T = getThumbBit(pReloc); 1055551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord A = helper_thumb32_branch_offset(upper_inst, lower_inst); 1056551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::Address P = pReloc.place(); 1057551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::Address S; 10585460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 10595460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // if symbol has plt 1060f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (pReloc.symInfo()->reserved() & ARMRelocator::ReservePLT) { 106187f34658dec9097d987d254a990ea7f311bfc95fStephen Hines S = helper_get_PLT_address(*pReloc.symInfo(), pParent); 10625460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao T = 0; // PLT is not thumb. 106337b74a387bb3993387029859c2d9d051c41c724eStephen Hines } else { 1064affc150dc44fab1911775a49636d0ce85333b634Zonr Chang S = pReloc.symValue(); 1065f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (T != 0x0) 1066f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines helper_clear_thumb_bit(S); 1067affc150dc44fab1911775a49636d0ce85333b634Zonr Chang } 10685460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 1069affc150dc44fab1911775a49636d0ce85333b634Zonr Chang S = S + A; 10705460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 107122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // At this moment (after relaxation), if the jump target is arm 107222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // instruction, switch mode is needed, rewrite the instruction to BLX 1073affc150dc44fab1911775a49636d0ce85333b634Zonr Chang // FIXME: check if we can use BLX instruction (check from .ARM.attribute 1074affc150dc44fab1911775a49636d0ce85333b634Zonr Chang // CPU ARCH TAG, which should be ARMv5 or above) 1075affc150dc44fab1911775a49636d0ce85333b634Zonr Chang if (T == 0) { 107622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // cannot rewrite to blx for R_ARM_THM_JUMP24 107722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao if (pReloc.type() == llvm::ELF::R_ARM_THM_JUMP24) 1078551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::BadReloc; 107922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 1080affc150dc44fab1911775a49636d0ce85333b634Zonr Chang // for BLX, select bit 1 from relocation base address to jump target 1081affc150dc44fab1911775a49636d0ce85333b634Zonr Chang // address 1082affc150dc44fab1911775a49636d0ce85333b634Zonr Chang S = helper_bit_select(S, P, 0x2); 1083affc150dc44fab1911775a49636d0ce85333b634Zonr Chang // rewrite instruction to BLX 108422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao lower_inst &= ~0x1000U; 108537b74a387bb3993387029859c2d9d051c41c724eStephen Hines } else { 1086affc150dc44fab1911775a49636d0ce85333b634Zonr Chang // otherwise, the instruction should be BL 108722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao lower_inst |= 0x1000U; 1088affc150dc44fab1911775a49636d0ce85333b634Zonr Chang } 1089affc150dc44fab1911775a49636d0ce85333b634Zonr Chang 1090551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord X = (S | T) - P; 1091affc150dc44fab1911775a49636d0ce85333b634Zonr Chang 10925460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // FIXME: Check bit size is 24(thumb2) or 22? 1093affc150dc44fab1911775a49636d0ce85333b634Zonr Chang if (helper_check_signed_overflow(X, 25)) { 1094551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::Overflow; 10955460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 10965460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 109722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao upper_inst = helper_thumb32_branch_upper(upper_inst, X); 109822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao lower_inst = helper_thumb32_branch_lower(lower_inst, X); 10995460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 110022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao *(reinterpret_cast<uint16_t*>(&pReloc.target())) = upper_inst; 110122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao *(reinterpret_cast<uint16_t*>(&pReloc.target()) + 1) = lower_inst; 11025460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 1103551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 11045460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 11055460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 11065460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// R_ARM_MOVW_ABS_NC: (S + A) | T 110737b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::Result movw_abs_nc(Relocation& pReloc, ARMRelocator& pParent) { 11085460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao ResolveInfo* rsym = pReloc.symInfo(); 1109551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::Address S = pReloc.symValue(); 1110551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord T = getThumbBit(pReloc); 1111551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord A = 111237b74a387bb3993387029859c2d9d051c41c724eStephen Hines helper_extract_movw_movt_addend(pReloc.target()) + pReloc.addend(); 1113f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (T != 0x0) 1114f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines helper_clear_thumb_bit(S); 11155460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 111622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao LDSection& target_sect = pReloc.targetRef().frag()->getParent()->getSection(); 111722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 111867e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao // If the flag of target section is not ALLOC, we will not scan this 111967e37f1be98c926645219cfb47fab9e90d8c725cShih-wei Liao // relocation but perform static relocation. (e.g., applying .debug section) 112037b74a387bb3993387029859c2d9d051c41c724eStephen Hines if ((llvm::ELF::SHF_ALLOC & target_sect.flag()) != 0x0) { 1121affc150dc44fab1911775a49636d0ce85333b634Zonr Chang // use plt 1122f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (rsym->reserved() & ARMRelocator::ReservePLT) { 112387f34658dec9097d987d254a990ea7f311bfc95fStephen Hines S = helper_get_PLT_address(*rsym, pParent); 112437b74a387bb3993387029859c2d9d051c41c724eStephen Hines T = 0; // PLT is not thumb 1125affc150dc44fab1911775a49636d0ce85333b634Zonr Chang } 11265460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 1127affc150dc44fab1911775a49636d0ce85333b634Zonr Chang 11285460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // perform static relocation 1129551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord X = (S + A) | T; 113037b74a387bb3993387029859c2d9d051c41c724eStephen Hines pReloc.target() = 113137b74a387bb3993387029859c2d9d051c41c724eStephen Hines helper_insert_val_movw_movt_inst(pReloc.target() + pReloc.addend(), X); 1132551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 11335460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 11345460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 11355460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// R_ARM_MOVW_PREL_NC: ((S + A) | T) - P 113637b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::Result movw_prel_nc(Relocation& pReloc, ARMRelocator& pParent) { 1137551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::Address S = pReloc.symValue(); 1138551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord T = getThumbBit(pReloc); 1139551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord P = pReloc.place(); 1140551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord A = 114137b74a387bb3993387029859c2d9d051c41c724eStephen Hines helper_extract_movw_movt_addend(pReloc.target()) + pReloc.addend(); 1142f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (T != 0x0) 1143f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines helper_clear_thumb_bit(S); 1144551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord X = ((S + A) | T) - P; 11455460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 11465460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao if (helper_check_signed_overflow(X, 16)) { 1147551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::Overflow; 11485460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } else { 11495460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao pReloc.target() = helper_insert_val_movw_movt_inst(pReloc.target(), X); 1150551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 11515460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 11525460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 11535460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 11545460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// R_ARM_MOVT_ABS: S + A 115537b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::Result movt_abs(Relocation& pReloc, ARMRelocator& pParent) { 11565460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao ResolveInfo* rsym = pReloc.symInfo(); 1157551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::Address S = pReloc.symValue(); 1158551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord A = 115937b74a387bb3993387029859c2d9d051c41c724eStephen Hines helper_extract_movw_movt_addend(pReloc.target()) + pReloc.addend(); 11605460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 116122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao LDSection& target_sect = pReloc.targetRef().frag()->getParent()->getSection(); 116222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 116337b74a387bb3993387029859c2d9d051c41c724eStephen Hines // If the flag of target section is not ALLOC, we will not scan this 116437b74a387bb3993387029859c2d9d051c41c724eStephen Hines // relocation 1165affc150dc44fab1911775a49636d0ce85333b634Zonr Chang // but perform static relocation. (e.g., applying .debug section) 116637b74a387bb3993387029859c2d9d051c41c724eStephen Hines if ((llvm::ELF::SHF_ALLOC & target_sect.flag()) != 0x0) { 1167affc150dc44fab1911775a49636d0ce85333b634Zonr Chang // use plt 1168f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (rsym->reserved() & ARMRelocator::ReservePLT) { 116987f34658dec9097d987d254a990ea7f311bfc95fStephen Hines S = helper_get_PLT_address(*rsym, pParent); 1170affc150dc44fab1911775a49636d0ce85333b634Zonr Chang } 11715460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 11725460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 1173551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord X = S + A; 11745460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao X >>= 16; 11755460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // perform static relocation 11765460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao pReloc.target() = helper_insert_val_movw_movt_inst(pReloc.target(), X); 1177551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 11785460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 11795460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 11805460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// R_ARM_MOVT_PREL: S + A - P 118137b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::Result movt_prel(Relocation& pReloc, ARMRelocator& pParent) { 1182551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::Address S = pReloc.symValue(); 1183551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord P = pReloc.place(); 1184551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord A = 118537b74a387bb3993387029859c2d9d051c41c724eStephen Hines helper_extract_movw_movt_addend(pReloc.target()) + pReloc.addend(); 1186551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord X = S + A - P; 11875460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao X >>= 16; 11885460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 11895460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao pReloc.target() = helper_insert_val_movw_movt_inst(pReloc.target(), X); 1190551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 11915460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 11925460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 11935460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// R_ARM_THM_MOVW_ABS_NC: (S + A) | T 119437b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::Result thm_movw_abs_nc(Relocation& pReloc, 119537b74a387bb3993387029859c2d9d051c41c724eStephen Hines ARMRelocator& pParent) { 11965460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao ResolveInfo* rsym = pReloc.symInfo(); 1197551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::Address S = pReloc.symValue(); 1198551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord T = getThumbBit(pReloc); 1199f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (T != 0x0) 1200f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines helper_clear_thumb_bit(S); 120122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 120222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // get lower and upper 16 bit instructions from relocation targetData 120322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint16_t upper_inst = *(reinterpret_cast<uint16_t*>(&pReloc.target())); 120422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint16_t lower_inst = *(reinterpret_cast<uint16_t*>(&pReloc.target()) + 1); 1205551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord val = ((upper_inst) << 16) | (lower_inst); 1206551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord A = 120737b74a387bb3993387029859c2d9d051c41c724eStephen Hines helper_extract_thumb_movw_movt_addend(val) + pReloc.addend(); 12085460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 120922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao LDSection& target_sect = pReloc.targetRef().frag()->getParent()->getSection(); 121037b74a387bb3993387029859c2d9d051c41c724eStephen Hines // If the flag of target section is not ALLOC, we will not scan this 121137b74a387bb3993387029859c2d9d051c41c724eStephen Hines // relocation 1212affc150dc44fab1911775a49636d0ce85333b634Zonr Chang // but perform static relocation. (e.g., applying .debug section) 121337b74a387bb3993387029859c2d9d051c41c724eStephen Hines if ((llvm::ELF::SHF_ALLOC & target_sect.flag()) != 0x0) { 1214affc150dc44fab1911775a49636d0ce85333b634Zonr Chang // use plt 1215f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (rsym->reserved() & ARMRelocator::ReservePLT) { 121687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines S = helper_get_PLT_address(*rsym, pParent); 121737b74a387bb3993387029859c2d9d051c41c724eStephen Hines T = 0; // PLT is not thumb 1218affc150dc44fab1911775a49636d0ce85333b634Zonr Chang } 12195460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 1220551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord X = (S + A) | T; 122122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 122222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao val = helper_insert_val_thumb_movw_movt_inst(val, X); 1223f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines *(reinterpret_cast<uint16_t*>(&pReloc.target())) = val >> 16; 1224f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines *(reinterpret_cast<uint16_t*>(&pReloc.target()) + 1) = val & 0xFFFFu; 122522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 1226551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 12275460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 12285460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 12295460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// R_ARM_THM_MOVW_PREL_NC: ((S + A) | T) - P 123037b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::Result thm_movw_prel_nc(Relocation& pReloc, 123137b74a387bb3993387029859c2d9d051c41c724eStephen Hines ARMRelocator& pParent) { 1232551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::Address S = pReloc.symValue(); 1233551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord T = getThumbBit(pReloc); 1234551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord P = pReloc.place(); 1235f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (T != 0x0) 1236f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines helper_clear_thumb_bit(S); 123722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 123822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // get lower and upper 16 bit instructions from relocation targetData 123922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint16_t upper_inst = *(reinterpret_cast<uint16_t*>(&pReloc.target())); 124022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint16_t lower_inst = *(reinterpret_cast<uint16_t*>(&pReloc.target()) + 1); 1241551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord val = ((upper_inst) << 16) | (lower_inst); 1242551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord A = 124337b74a387bb3993387029859c2d9d051c41c724eStephen Hines helper_extract_thumb_movw_movt_addend(val) + pReloc.addend(); 1244551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord X = ((S + A) | T) - P; 12455460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 124622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao val = helper_insert_val_thumb_movw_movt_inst(val, X); 1247f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines *(reinterpret_cast<uint16_t*>(&pReloc.target())) = val >> 16; 1248f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines *(reinterpret_cast<uint16_t*>(&pReloc.target()) + 1) = val & 0xFFFFu; 124922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 1250551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 1251affc150dc44fab1911775a49636d0ce85333b634Zonr Chang} 1252affc150dc44fab1911775a49636d0ce85333b634Zonr Chang 1253affc150dc44fab1911775a49636d0ce85333b634Zonr Chang// R_ARM_THM_MOVW_BREL_NC: ((S + A) | T) - B(S) 1254affc150dc44fab1911775a49636d0ce85333b634Zonr Chang// R_ARM_THM_MOVW_BREL: ((S + A) | T) - B(S) 125537b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::Result thm_movw_brel(Relocation& pReloc, ARMRelocator& pParent) { 1256551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::Address S = pReloc.symValue(); 1257551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord T = getThumbBit(pReloc); 1258551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord P = pReloc.place(); 1259f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (T != 0x0) 1260f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines helper_clear_thumb_bit(S); 126122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 126222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // get lower and upper 16 bit instructions from relocation targetData 126322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint16_t upper_inst = *(reinterpret_cast<uint16_t*>(&pReloc.target())); 126422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint16_t lower_inst = *(reinterpret_cast<uint16_t*>(&pReloc.target()) + 1); 1265551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord val = ((upper_inst) << 16) | (lower_inst); 1266551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord A = 126737b74a387bb3993387029859c2d9d051c41c724eStephen Hines helper_extract_thumb_movw_movt_addend(val) + pReloc.addend(); 1268affc150dc44fab1911775a49636d0ce85333b634Zonr Chang 1269551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord X = ((S + A) | T) - P; 1270affc150dc44fab1911775a49636d0ce85333b634Zonr Chang 127122add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao val = helper_insert_val_thumb_movw_movt_inst(val, X); 1272f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines *(reinterpret_cast<uint16_t*>(&pReloc.target())) = val >> 16; 1273f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines *(reinterpret_cast<uint16_t*>(&pReloc.target()) + 1) = val & 0xFFFFu; 127422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 1275551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 12765460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 12775460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 12785460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// R_ARM_THM_MOVT_ABS: S + A 127937b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::Result thm_movt_abs(Relocation& pReloc, ARMRelocator& pParent) { 12805460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao ResolveInfo* rsym = pReloc.symInfo(); 1281551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::Address S = pReloc.symValue(); 128222add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 128322add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // get lower and upper 16 bit instructions from relocation targetData 128422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint16_t upper_inst = *(reinterpret_cast<uint16_t*>(&pReloc.target())); 128522add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint16_t lower_inst = *(reinterpret_cast<uint16_t*>(&pReloc.target()) + 1); 1286551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord val = ((upper_inst) << 16) | (lower_inst); 1287551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord A = 128837b74a387bb3993387029859c2d9d051c41c724eStephen Hines helper_extract_thumb_movw_movt_addend(val) + pReloc.addend(); 12895460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 129022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao LDSection& target_sect = pReloc.targetRef().frag()->getParent()->getSection(); 1291f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // If the flag of target section is not ALLOC, we will not scan this 1292f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines // relocation but perform static relocation. (e.g., applying .debug section) 129337b74a387bb3993387029859c2d9d051c41c724eStephen Hines if ((llvm::ELF::SHF_ALLOC & target_sect.flag()) != 0x0) { 1294affc150dc44fab1911775a49636d0ce85333b634Zonr Chang // use plt 1295f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (rsym->reserved() & ARMRelocator::ReservePLT) { 129687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines S = helper_get_PLT_address(*rsym, pParent); 1297affc150dc44fab1911775a49636d0ce85333b634Zonr Chang } 12985460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 1299affc150dc44fab1911775a49636d0ce85333b634Zonr Chang 1300551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord X = S + A; 13015460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao X >>= 16; 13025460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 13035460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // check 16-bit overflow 1304f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (helper_check_signed_overflow(X, 16)) 1305551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::Overflow; 1306f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines val = helper_insert_val_thumb_movw_movt_inst(val, X); 1307f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines *(reinterpret_cast<uint16_t*>(&pReloc.target())) = val >> 16; 1308f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines *(reinterpret_cast<uint16_t*>(&pReloc.target()) + 1) = val & 0xFFFFu; 1309551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 13105460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 13115460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 13125460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// R_ARM_THM_MOVT_PREL: S + A - P 1313affc150dc44fab1911775a49636d0ce85333b634Zonr Chang// R_ARM_THM_MOVT_BREL: S + A - B(S) 131437b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::Result thm_movt_prel(Relocation& pReloc, ARMRelocator& pParent) { 1315551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::Address S = pReloc.symValue(); 1316551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord P = pReloc.place(); 131722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 131822add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao // get lower and upper 16 bit instructions from relocation targetData 131922add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint16_t upper_inst = *(reinterpret_cast<uint16_t*>(&pReloc.target())); 132022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao uint16_t lower_inst = *(reinterpret_cast<uint16_t*>(&pReloc.target()) + 1); 1321551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord val = ((upper_inst) << 16) | (lower_inst); 1322551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord A = 132337b74a387bb3993387029859c2d9d051c41c724eStephen Hines helper_extract_thumb_movw_movt_addend(val) + pReloc.addend(); 1324551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord X = S + A - P; 13255460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao X >>= 16; 132622add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 132722add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao val = helper_insert_val_thumb_movw_movt_inst(val, X); 1328f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines *(reinterpret_cast<uint16_t*>(&pReloc.target())) = val >> 16; 1329f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines *(reinterpret_cast<uint16_t*>(&pReloc.target()) + 1) = val & 0xFFFFu; 133022add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao 1331551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 13325460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 13335460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 133422add6ff3426df1a85089fe6a6e1597ee3b6f300Shih-wei Liao// R_ARM_PREL31: ((S + A) | T) - P 133537b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::Result prel31(Relocation& pReloc, ARMRelocator& pParent) { 1336551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord target = pReloc.target(); 1337551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord T = getThumbBit(pReloc); 1338551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord A = helper_sign_extend(target, 31) + pReloc.addend(); 1339551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord P = pReloc.place(); 1340551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::Address S = pReloc.symValue(); 1341f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines if (T != 0x0) 1342f7ac0f19a1c8d0ad14bcf6456ce368b830fea886Stephen Hines helper_clear_thumb_bit(S); 13435460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 13445460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao // if symbol has plt 134537b74a387bb3993387029859c2d9d051c41c724eStephen Hines if (pReloc.symInfo()->reserved() & ARMRelocator::ReservePLT) { 134687f34658dec9097d987d254a990ea7f311bfc95fStephen Hines S = helper_get_PLT_address(*pReloc.symInfo(), pParent); 13475460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao T = 0; // PLT is not thumb. 13485460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao } 13495460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 1350551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines Relocator::DWord X = ((S + A) | T) - P; 13515460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao pReloc.target() = helper_bit_select(target, X, 0x7fffffffU); 1352affc150dc44fab1911775a49636d0ce85333b634Zonr Chang if (helper_check_signed_overflow(X, 31)) 1353551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::Overflow; 1354551ae4ebd3e9d137ea668fb83ae4a55b8cfba451Stephen Hines return Relocator::OK; 13555460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 13565460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 13575460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// R_ARM_TLS_GD32: GOT(S) + A - P 13585460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// R_ARM_TLS_IE32: GOT(S) + A - P 13595460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao// R_ARM_TLS_LE32: S + A - tp 136037b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::Result tls(Relocation& pReloc, ARMRelocator& pParent) { 136137b74a387bb3993387029859c2d9d051c41c724eStephen Hines return Relocator::Unsupported; 13625460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 13635460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao 136437b74a387bb3993387029859c2d9d051c41c724eStephen HinesARMRelocator::Result unsupported(Relocation& pReloc, ARMRelocator& pParent) { 136537b74a387bb3993387029859c2d9d051c41c724eStephen Hines return Relocator::Unsupported; 13665460a1f25d9ddecb5c70667267d66d51af177a99Shih-wei Liao} 136737b74a387bb3993387029859c2d9d051c41c724eStephen Hines 136837b74a387bb3993387029859c2d9d051c41c724eStephen Hines} // namespace mcld 1369