ARMJITInfo.cpp revision 770d718405114860f3874871848e345873bf7cb4
1f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman//===-- ARMJITInfo.cpp - Implement the JIT interfaces for the ARM target --===// 2f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman// 3f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman// The LLVM Compiler Infrastructure 4f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman// 5081ce940e7351e90fff829320b7dc6738a6b3815Chris Lattner// This file is distributed under the University of Illinois Open Source 6081ce940e7351e90fff829320b7dc6738a6b3815Chris Lattner// License. See LICENSE.TXT for details. 7f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman// 8f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman//===----------------------------------------------------------------------===// 9f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman// 10f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman// This file implements the JIT interfaces for the ARM target. 11f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman// 12f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman//===----------------------------------------------------------------------===// 13f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman 14f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman#define DEBUG_TYPE "jit" 15f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman#include "ARMJITInfo.h" 16668d0df68e2c40e4f4073535afcc5ec210d7d200Evan Cheng#include "ARMInstrInfo.h" 175a033a6c9c08d06f316e42b111cc79756c672733Evan Cheng#include "ARMConstantPoolValue.h" 18f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman#include "ARMRelocations.h" 19f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman#include "ARMSubtarget.h" 202b483b5fb10fd3e6223b824726c9403bb47c1e1cNicolas Geoffray#include "llvm/Function.h" 211ea31ff434f7966f3d8b2c158b4f20950e94e80dBruno Cardoso Lopes#include "llvm/CodeGen/JITCodeEmitter.h" 22f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman#include "llvm/Config/alloca.h" 235120b9fa2d6559eb94dab3079ff346926c73940fEvan Cheng#include "llvm/Support/Debug.h" 243cb884811f68c27210391441d631146faa74f55eEdwin Török#include "llvm/Support/ErrorHandling.h" 25c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach#include "llvm/Support/Streams.h" 26005975c04c5ffc4ee07107ad60dd7d465464e6f7Daniel Dunbar#include "llvm/Support/raw_ostream.h" 27c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach#include "llvm/System/Memory.h" 28f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman#include <cstdlib> 29f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohmanusing namespace llvm; 30f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman 31f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohmanvoid ARMJITInfo::replaceMachineCodeForFunction(void *Old, void *New) { 323cb884811f68c27210391441d631146faa74f55eEdwin Török llvm_report_error("ARMJITInfo::replaceMachineCodeForFunction"); 33f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman} 34f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman 35f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman/// JITCompilerFunction - This contains the address of the JIT function used to 36f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman/// compile a function lazily. 37f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohmanstatic TargetJITInfo::JITCompilerFn JITCompilerFunction; 38f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman 395d582a69ee011cf14e31b5d27b0401db0102ce89Evan Cheng// Get the ASMPREFIX for the current host. This is often '_'. 405d582a69ee011cf14e31b5d27b0401db0102ce89Evan Cheng#ifndef __USER_LABEL_PREFIX__ 415d582a69ee011cf14e31b5d27b0401db0102ce89Evan Cheng#define __USER_LABEL_PREFIX__ 425d582a69ee011cf14e31b5d27b0401db0102ce89Evan Cheng#endif 435d582a69ee011cf14e31b5d27b0401db0102ce89Evan Cheng#define GETASMPREFIX2(X) #X 445d582a69ee011cf14e31b5d27b0401db0102ce89Evan Cheng#define GETASMPREFIX(X) GETASMPREFIX2(X) 455d582a69ee011cf14e31b5d27b0401db0102ce89Evan Cheng#define ASMPREFIX GETASMPREFIX(__USER_LABEL_PREFIX__) 465d582a69ee011cf14e31b5d27b0401db0102ce89Evan Cheng 47f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman// CompilationCallback stub - We can't use a C function with inline assembly in 48c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach// it, because we the prolog/epilog inserted by GCC won't work for us (we need 49c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach// to preserve more context and manipulate the stack directly). Instead, 50770d718405114860f3874871848e345873bf7cb4Jim Grosbach// write our own wrapper, which does things our way, so we have complete 51c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach// control over register saving and restoring. 52f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohmanextern "C" { 53f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman#if defined(__arm__) 54f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman void ARMCompilationCallback(void); 55f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman asm( 56f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman ".text\n" 57f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman ".align 2\n" 585d582a69ee011cf14e31b5d27b0401db0102ce89Evan Cheng ".globl " ASMPREFIX "ARMCompilationCallback\n" 595d582a69ee011cf14e31b5d27b0401db0102ce89Evan Cheng ASMPREFIX "ARMCompilationCallback:\n" 60c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // Save caller saved registers since they may contain stuff 61c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // for the real target function right now. We have to act as if this 62c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // whole compilation callback doesn't exist as far as the caller is 63c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // concerned, so we can't just preserve the callee saved regs. 648eab1c8c9852bb78231148ac4fb2d93b975f4ccdJim Grosbach "stmdb sp!, {r0, r1, r2, r3, lr}\n" 65643484ec3ec819eccc87f9bf4ec3ab7ee7fce7ccEvan Cheng#ifndef __SOFTFP__ 66649de51e103995ae3efa6ff4aab7c0a7e480bc56Evan Cheng "fstmfdd sp!, {d0, d1, d2, d3, d4, d5, d6, d7}\n" 67649de51e103995ae3efa6ff4aab7c0a7e480bc56Evan Cheng#endif 68c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // The LR contains the address of the stub function on entry. 69c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // pass it as the argument to the C part of the callback 70c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach "mov r0, lr\n" 71c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach "sub sp, sp, #4\n" 72c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // Call the C portion of the callback 73c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach "bl " ASMPREFIX "ARMCompilationCallbackC\n" 74c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach "add sp, sp, #4\n" 75c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // Restoring the LR to the return address of the function that invoked 76c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // the stub and de-allocating the stack space for it requires us to 77c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // swap the two saved LR values on the stack, as they're backwards 78c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // for what we need since the pop instruction has a pre-determined 79c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // order for the registers. 80c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // +--------+ 81c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // 0 | LR | Original return address 82770d718405114860f3874871848e345873bf7cb4Jim Grosbach // +--------+ 83c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // 1 | LR | Stub address (start of stub) 84c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // 2-5 | R3..R0 | Saved registers (we need to preserve all regs) 85649de51e103995ae3efa6ff4aab7c0a7e480bc56Evan Cheng // 6-20 | D0..D7 | Saved VFP registers 86770d718405114860f3874871848e345873bf7cb4Jim Grosbach // +--------+ 87c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // 88643484ec3ec819eccc87f9bf4ec3ab7ee7fce7ccEvan Cheng#ifndef __SOFTFP__ 89649de51e103995ae3efa6ff4aab7c0a7e480bc56Evan Cheng // Restore VFP caller-saved registers. 90649de51e103995ae3efa6ff4aab7c0a7e480bc56Evan Cheng "fldmfdd sp!, {d0, d1, d2, d3, d4, d5, d6, d7}\n" 91649de51e103995ae3efa6ff4aab7c0a7e480bc56Evan Cheng#endif 92649de51e103995ae3efa6ff4aab7c0a7e480bc56Evan Cheng // 93c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // We need to exchange the values in slots 0 and 1 so we can 94c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // return to the address in slot 1 with the address in slot 0 95c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // restored to the LR. 96c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach "ldr r0, [sp,#20]\n" 97c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach "ldr r1, [sp,#16]\n" 98c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach "str r1, [sp,#20]\n" 99c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach "str r0, [sp,#16]\n" 100c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // Return to the (newly modified) stub to invoke the real function. 101c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // The above twiddling of the saved return addresses allows us to 102c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // deallocate everything, including the LR the stub saved, all in one 103c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // pop instruction. 1048eab1c8c9852bb78231148ac4fb2d93b975f4ccdJim Grosbach "ldmia sp!, {r0, r1, r2, r3, lr, pc}\n" 1055d582a69ee011cf14e31b5d27b0401db0102ce89Evan Cheng ); 1065d582a69ee011cf14e31b5d27b0401db0102ce89Evan Cheng#else // Not an ARM host 107f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman void ARMCompilationCallback() { 108bd448e3ca993226084d7f53445388fcd8e46b996Edwin Török llvm_unreachable("Cannot call ARMCompilationCallback() on a non-ARM arch!"); 109f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman } 110f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman#endif 111f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman} 112f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman 113770d718405114860f3874871848e345873bf7cb4Jim Grosbach/// ARMCompilationCallbackC - This is the target-specific function invoked 114770d718405114860f3874871848e345873bf7cb4Jim Grosbach/// by the function stub when we did not know the real target of a call. 115770d718405114860f3874871848e345873bf7cb4Jim Grosbach/// This function must locate the start of the stub or call site and pass 116c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach/// it into the JIT compiler function. 117c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbachextern "C" void ARMCompilationCallbackC(intptr_t StubAddr) { 118c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // Get the address of the compiled code for this function. 119c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach intptr_t NewVal = (intptr_t)JITCompilerFunction((void*)StubAddr); 120f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman 121f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman // Rewrite the call target... so that we don't end up here every time we 122c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // execute the call. We're replacing the first two instructions of the 123c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // stub with: 124c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // ldr pc, [pc,#-4] 125c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // <addr> 126886dafe6e0958d8da971a539954ae4c050c783daEvan Cheng if (!sys::Memory::setRangeWritable((void*)StubAddr, 8)) { 127bd448e3ca993226084d7f53445388fcd8e46b996Edwin Török llvm_unreachable("ERROR: Unable to mark stub writable"); 128886dafe6e0958d8da971a539954ae4c050c783daEvan Cheng } 129886dafe6e0958d8da971a539954ae4c050c783daEvan Cheng *(intptr_t *)StubAddr = 0xe51ff004; // ldr pc, [pc, #-4] 130c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach *(intptr_t *)(StubAddr+4) = NewVal; 131886dafe6e0958d8da971a539954ae4c050c783daEvan Cheng if (!sys::Memory::setRangeExecutable((void*)StubAddr, 8)) { 132bd448e3ca993226084d7f53445388fcd8e46b996Edwin Török llvm_unreachable("ERROR: Unable to mark stub executable"); 133886dafe6e0958d8da971a539954ae4c050c783daEvan Cheng } 134f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman} 135f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman 136f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan GohmanTargetJITInfo::LazyResolverFn 137f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan GohmanARMJITInfo::getLazyResolverFunction(JITCompilerFn F) { 138f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman JITCompilerFunction = F; 139f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman return ARMCompilationCallback; 140f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman} 141f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman 1428af22c446b6eefa8dddd2412c7d779feb4c7bf0aEvan Chengvoid *ARMJITInfo::emitGlobalValueIndirectSym(const GlobalValue *GV, void *Ptr, 1431ea31ff434f7966f3d8b2c158b4f20950e94e80dBruno Cardoso Lopes JITCodeEmitter &JCE) { 1441ea31ff434f7966f3d8b2c158b4f20950e94e80dBruno Cardoso Lopes JCE.startGVStub(GV, 4, 4); 1451ea31ff434f7966f3d8b2c158b4f20950e94e80dBruno Cardoso Lopes JCE.emitWordLE((intptr_t)Ptr); 1461ea31ff434f7966f3d8b2c158b4f20950e94e80dBruno Cardoso Lopes void *PtrAddr = JCE.finishGVStub(GV); 1475120b9fa2d6559eb94dab3079ff346926c73940fEvan Cheng addIndirectSymAddr(Ptr, (intptr_t)PtrAddr); 1485120b9fa2d6559eb94dab3079ff346926c73940fEvan Cheng return PtrAddr; 1492d011f9f433116e91c2d98e8f3c32bb9608ce666Evan Cheng} 1502d011f9f433116e91c2d98e8f3c32bb9608ce666Evan Cheng 1512b483b5fb10fd3e6223b824726c9403bb47c1e1cNicolas Geoffrayvoid *ARMJITInfo::emitFunctionStub(const Function* F, void *Fn, 1521ea31ff434f7966f3d8b2c158b4f20950e94e80dBruno Cardoso Lopes JITCodeEmitter &JCE) { 153f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman // If this is just a call to an external function, emit a branch instead of a 154f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman // call. The code is the same except for one bit of the last instruction. 155f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman if (Fn != (void*)(intptr_t)ARMCompilationCallback) { 1562d011f9f433116e91c2d98e8f3c32bb9608ce666Evan Cheng // Branch to the corresponding function addr. 1575120b9fa2d6559eb94dab3079ff346926c73940fEvan Cheng if (IsPIC) { 1585120b9fa2d6559eb94dab3079ff346926c73940fEvan Cheng // The stub is 8-byte size and 4-aligned. 1595120b9fa2d6559eb94dab3079ff346926c73940fEvan Cheng intptr_t LazyPtr = getIndirectSymAddr(Fn); 1605120b9fa2d6559eb94dab3079ff346926c73940fEvan Cheng if (!LazyPtr) { 1615120b9fa2d6559eb94dab3079ff346926c73940fEvan Cheng // In PIC mode, the function stub is loading a lazy-ptr. 1621ea31ff434f7966f3d8b2c158b4f20950e94e80dBruno Cardoso Lopes LazyPtr= (intptr_t)emitGlobalValueIndirectSym((GlobalValue*)F, Fn, JCE); 163005975c04c5ffc4ee07107ad60dd7d465464e6f7Daniel Dunbar DEBUG(if (F) 164770d718405114860f3874871848e345873bf7cb4Jim Grosbach errs() << "JIT: Indirect symbol emitted at [" << LazyPtr 165005975c04c5ffc4ee07107ad60dd7d465464e6f7Daniel Dunbar << "] for GV '" << F->getName() << "'\n"; 166005975c04c5ffc4ee07107ad60dd7d465464e6f7Daniel Dunbar else 167005975c04c5ffc4ee07107ad60dd7d465464e6f7Daniel Dunbar errs() << "JIT: Stub emitted at [" << LazyPtr 168005975c04c5ffc4ee07107ad60dd7d465464e6f7Daniel Dunbar << "] for external function at '" << Fn << "'\n"); 1695120b9fa2d6559eb94dab3079ff346926c73940fEvan Cheng } 1701ea31ff434f7966f3d8b2c158b4f20950e94e80dBruno Cardoso Lopes JCE.startGVStub(F, 16, 4); 1711ea31ff434f7966f3d8b2c158b4f20950e94e80dBruno Cardoso Lopes intptr_t Addr = (intptr_t)JCE.getCurrentPCValue(); 1721ea31ff434f7966f3d8b2c158b4f20950e94e80dBruno Cardoso Lopes JCE.emitWordLE(0xe59fc004); // ldr pc, [pc, #+4] 1731ea31ff434f7966f3d8b2c158b4f20950e94e80dBruno Cardoso Lopes JCE.emitWordLE(0xe08fc00c); // L_func$scv: add ip, pc, ip 1741ea31ff434f7966f3d8b2c158b4f20950e94e80dBruno Cardoso Lopes JCE.emitWordLE(0xe59cf000); // ldr pc, [ip] 1751ea31ff434f7966f3d8b2c158b4f20950e94e80dBruno Cardoso Lopes JCE.emitWordLE(LazyPtr - (Addr+4+8)); // func - (L_func$scv+8) 1765120b9fa2d6559eb94dab3079ff346926c73940fEvan Cheng sys::Memory::InvalidateInstructionCache((void*)Addr, 16); 1775120b9fa2d6559eb94dab3079ff346926c73940fEvan Cheng } else { 1785120b9fa2d6559eb94dab3079ff346926c73940fEvan Cheng // The stub is 8-byte size and 4-aligned. 1791ea31ff434f7966f3d8b2c158b4f20950e94e80dBruno Cardoso Lopes JCE.startGVStub(F, 8, 4); 1801ea31ff434f7966f3d8b2c158b4f20950e94e80dBruno Cardoso Lopes intptr_t Addr = (intptr_t)JCE.getCurrentPCValue(); 1811ea31ff434f7966f3d8b2c158b4f20950e94e80dBruno Cardoso Lopes JCE.emitWordLE(0xe51ff004); // ldr pc, [pc, #-4] 1821ea31ff434f7966f3d8b2c158b4f20950e94e80dBruno Cardoso Lopes JCE.emitWordLE((intptr_t)Fn); // addr of function 1835120b9fa2d6559eb94dab3079ff346926c73940fEvan Cheng sys::Memory::InvalidateInstructionCache((void*)Addr, 8); 1845120b9fa2d6559eb94dab3079ff346926c73940fEvan Cheng } 185f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman } else { 186c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // The compilation callback will overwrite the first two words of this 187770d718405114860f3874871848e345873bf7cb4Jim Grosbach // stub with indirect branch instructions targeting the compiled code. 188c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // This stub sets the return address to restart the stub, so that 189c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // the new branch will be invoked when we come back. 190c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // 1912d011f9f433116e91c2d98e8f3c32bb9608ce666Evan Cheng // Branch and link to the compilation callback. 1922d011f9f433116e91c2d98e8f3c32bb9608ce666Evan Cheng // The stub is 16-byte size and 4-byte aligned. 1931ea31ff434f7966f3d8b2c158b4f20950e94e80dBruno Cardoso Lopes JCE.startGVStub(F, 16, 4); 1941ea31ff434f7966f3d8b2c158b4f20950e94e80dBruno Cardoso Lopes intptr_t Addr = (intptr_t)JCE.getCurrentPCValue(); 195c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // Save LR so the callback can determine which stub called it. 196c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // The compilation callback is responsible for popping this prior 197c599a35bba7259e9b71aad881f5fc877ee34dc3dJim Grosbach // to returning. 1981ea31ff434f7966f3d8b2c158b4f20950e94e80dBruno Cardoso Lopes JCE.emitWordLE(0xe92d4000); // push {lr} 199886dafe6e0958d8da971a539954ae4c050c783daEvan Cheng // Set the return address to go back to the start of this stub. 2001ea31ff434f7966f3d8b2c158b4f20950e94e80dBruno Cardoso Lopes JCE.emitWordLE(0xe24fe00c); // sub lr, pc, #12 201886dafe6e0958d8da971a539954ae4c050c783daEvan Cheng // Invoke the compilation callback. 2021ea31ff434f7966f3d8b2c158b4f20950e94e80dBruno Cardoso Lopes JCE.emitWordLE(0xe51ff004); // ldr pc, [pc, #-4] 203886dafe6e0958d8da971a539954ae4c050c783daEvan Cheng // The address of the compilation callback. 2041ea31ff434f7966f3d8b2c158b4f20950e94e80dBruno Cardoso Lopes JCE.emitWordLE((intptr_t)ARMCompilationCallback); 205886dafe6e0958d8da971a539954ae4c050c783daEvan Cheng sys::Memory::InvalidateInstructionCache((void*)Addr, 16); 206f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman } 207f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman 2081ea31ff434f7966f3d8b2c158b4f20950e94e80dBruno Cardoso Lopes return JCE.finishGVStub(F); 209f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman} 210f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman 2110f63ae111d5a509911fc61246c1acc62f8c58f18Evan Chengintptr_t ARMJITInfo::resolveRelocDestAddr(MachineRelocation *MR) const { 2125a033a6c9c08d06f316e42b111cc79756c672733Evan Cheng ARM::RelocationType RT = (ARM::RelocationType)MR->getRelocationType(); 213668d0df68e2c40e4f4073535afcc5ec210d7d200Evan Cheng switch (RT) { 214668d0df68e2c40e4f4073535afcc5ec210d7d200Evan Cheng default: 215668d0df68e2c40e4f4073535afcc5ec210d7d200Evan Cheng return (intptr_t)(MR->getResultPointer()); 216668d0df68e2c40e4f4073535afcc5ec210d7d200Evan Cheng case ARM::reloc_arm_pic_jt: 217260ae19f81f574a4ec2c4cc648a63bd4278e4615Evan Cheng // Destination address - jump table base. 218260ae19f81f574a4ec2c4cc648a63bd4278e4615Evan Cheng return (intptr_t)(MR->getResultPointer()) - MR->getConstantVal(); 219668d0df68e2c40e4f4073535afcc5ec210d7d200Evan Cheng case ARM::reloc_arm_jt_base: 220260ae19f81f574a4ec2c4cc648a63bd4278e4615Evan Cheng // Jump table base address. 2210f63ae111d5a509911fc61246c1acc62f8c58f18Evan Cheng return getJumpTableBaseAddr(MR->getJumpTableIndex()); 222668d0df68e2c40e4f4073535afcc5ec210d7d200Evan Cheng case ARM::reloc_arm_cp_entry: 223668d0df68e2c40e4f4073535afcc5ec210d7d200Evan Cheng case ARM::reloc_arm_vfp_cp_entry: 224260ae19f81f574a4ec2c4cc648a63bd4278e4615Evan Cheng // Constant pool entry address. 2255a033a6c9c08d06f316e42b111cc79756c672733Evan Cheng return getConstantPoolEntryAddr(MR->getConstantPoolIndex()); 226668d0df68e2c40e4f4073535afcc5ec210d7d200Evan Cheng case ARM::reloc_arm_machine_cp_entry: { 2278600421afe774e20c147d9505e3ddc0c1fc04a99Evan Cheng ARMConstantPoolValue *ACPV = (ARMConstantPoolValue*)MR->getConstantVal(); 2285a033a6c9c08d06f316e42b111cc79756c672733Evan Cheng assert((!ACPV->hasModifier() && !ACPV->mustAddCurrentAddress()) && 2295a033a6c9c08d06f316e42b111cc79756c672733Evan Cheng "Can't handle this machine constant pool entry yet!"); 2305a033a6c9c08d06f316e42b111cc79756c672733Evan Cheng intptr_t Addr = (intptr_t)(MR->getResultPointer()); 2315a033a6c9c08d06f316e42b111cc79756c672733Evan Cheng Addr -= getPCLabelAddr(ACPV->getLabelId()) + ACPV->getPCAdjustment(); 2325a033a6c9c08d06f316e42b111cc79756c672733Evan Cheng return Addr; 2335a033a6c9c08d06f316e42b111cc79756c672733Evan Cheng } 234668d0df68e2c40e4f4073535afcc5ec210d7d200Evan Cheng } 2355a033a6c9c08d06f316e42b111cc79756c672733Evan Cheng} 2365a033a6c9c08d06f316e42b111cc79756c672733Evan Cheng 237f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman/// relocate - Before the JIT can run a block of code that has been emitted, 238f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman/// it must rewrite the code to contain the actual addresses of any 239f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman/// referenced global symbols. 240f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohmanvoid ARMJITInfo::relocate(void *Function, MachineRelocation *MR, 241f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman unsigned NumRelocs, unsigned char* GOTBase) { 242a7b3e7c33f1ef7be844fde18dcd9e24afdc97748Evan Cheng for (unsigned i = 0; i != NumRelocs; ++i, ++MR) { 243a7b3e7c33f1ef7be844fde18dcd9e24afdc97748Evan Cheng void *RelocPos = (char*)Function + MR->getMachineCodeOffset(); 2440f63ae111d5a509911fc61246c1acc62f8c58f18Evan Cheng intptr_t ResultPtr = resolveRelocDestAddr(MR); 245a7b3e7c33f1ef7be844fde18dcd9e24afdc97748Evan Cheng switch ((ARM::RelocationType)MR->getRelocationType()) { 246f07a9b69d1c91187d73667b46aa423d4325ccf04Evan Cheng case ARM::reloc_arm_cp_entry: 247668d0df68e2c40e4f4073535afcc5ec210d7d200Evan Cheng case ARM::reloc_arm_vfp_cp_entry: 248a7b3e7c33f1ef7be844fde18dcd9e24afdc97748Evan Cheng case ARM::reloc_arm_relative: { 24972551daeaad642f5bb9318d269bc0b7834381ef4Raul Herbster // It is necessary to calculate the correct PC relative value. We 25072551daeaad642f5bb9318d269bc0b7834381ef4Raul Herbster // subtract the base addr from the target addr to form a byte offset. 251668d0df68e2c40e4f4073535afcc5ec210d7d200Evan Cheng ResultPtr = ResultPtr - (intptr_t)RelocPos - 8; 25272551daeaad642f5bb9318d269bc0b7834381ef4Raul Herbster // If the result is positive, set bit U(23) to 1. 25372551daeaad642f5bb9318d269bc0b7834381ef4Raul Herbster if (ResultPtr >= 0) 254668d0df68e2c40e4f4073535afcc5ec210d7d200Evan Cheng *((intptr_t*)RelocPos) |= 1 << ARMII::U_BitShift; 25572551daeaad642f5bb9318d269bc0b7834381ef4Raul Herbster else { 256668d0df68e2c40e4f4073535afcc5ec210d7d200Evan Cheng // Otherwise, obtain the absolute value and set bit U(23) to 0. 257ba3d8bcb52d332b1af1283585e0d01d636bc2899Evan Cheng *((intptr_t*)RelocPos) &= ~(1 << ARMII::U_BitShift); 258668d0df68e2c40e4f4073535afcc5ec210d7d200Evan Cheng ResultPtr = - ResultPtr; 25972551daeaad642f5bb9318d269bc0b7834381ef4Raul Herbster } 2605a033a6c9c08d06f316e42b111cc79756c672733Evan Cheng // Set the immed value calculated. 261668d0df68e2c40e4f4073535afcc5ec210d7d200Evan Cheng // VFP immediate offset is multiplied by 4. 262668d0df68e2c40e4f4073535afcc5ec210d7d200Evan Cheng if (MR->getRelocationType() == ARM::reloc_arm_vfp_cp_entry) 263668d0df68e2c40e4f4073535afcc5ec210d7d200Evan Cheng ResultPtr = ResultPtr >> 2; 264668d0df68e2c40e4f4073535afcc5ec210d7d200Evan Cheng *((intptr_t*)RelocPos) |= ResultPtr; 2655a033a6c9c08d06f316e42b111cc79756c672733Evan Cheng // Set register Rn to PC. 266668d0df68e2c40e4f4073535afcc5ec210d7d200Evan Cheng *((intptr_t*)RelocPos) |= 267668d0df68e2c40e4f4073535afcc5ec210d7d200Evan Cheng ARMRegisterInfo::getRegisterNumbering(ARM::PC) << ARMII::RegRnShift; 268a7b3e7c33f1ef7be844fde18dcd9e24afdc97748Evan Cheng break; 269a7b3e7c33f1ef7be844fde18dcd9e24afdc97748Evan Cheng } 270260ae19f81f574a4ec2c4cc648a63bd4278e4615Evan Cheng case ARM::reloc_arm_pic_jt: 2715a033a6c9c08d06f316e42b111cc79756c672733Evan Cheng case ARM::reloc_arm_machine_cp_entry: 272f07a9b69d1c91187d73667b46aa423d4325ccf04Evan Cheng case ARM::reloc_arm_absolute: { 2735a033a6c9c08d06f316e42b111cc79756c672733Evan Cheng // These addresses have already been resolved. 274668d0df68e2c40e4f4073535afcc5ec210d7d200Evan Cheng *((intptr_t*)RelocPos) |= (intptr_t)ResultPtr; 275f07a9b69d1c91187d73667b46aa423d4325ccf04Evan Cheng break; 276f07a9b69d1c91187d73667b46aa423d4325ccf04Evan Cheng } 277a7b3e7c33f1ef7be844fde18dcd9e24afdc97748Evan Cheng case ARM::reloc_arm_branch: { 27872551daeaad642f5bb9318d269bc0b7834381ef4Raul Herbster // It is necessary to calculate the correct value of signed_immed_24 27972551daeaad642f5bb9318d269bc0b7834381ef4Raul Herbster // field. We subtract the base addr from the target addr to form a 28072551daeaad642f5bb9318d269bc0b7834381ef4Raul Herbster // byte offset, which must be inside the range -33554432 and +33554428. 28172551daeaad642f5bb9318d269bc0b7834381ef4Raul Herbster // Then, we set the signed_immed_24 field of the instruction to bits 28272551daeaad642f5bb9318d269bc0b7834381ef4Raul Herbster // [25:2] of the byte offset. More details ARM-ARM p. A4-11. 2830f63ae111d5a509911fc61246c1acc62f8c58f18Evan Cheng ResultPtr = ResultPtr - (intptr_t)RelocPos - 8; 28472551daeaad642f5bb9318d269bc0b7834381ef4Raul Herbster ResultPtr = (ResultPtr & 0x03FFFFFC) >> 2; 28572551daeaad642f5bb9318d269bc0b7834381ef4Raul Herbster assert(ResultPtr >= -33554432 && ResultPtr <= 33554428); 286668d0df68e2c40e4f4073535afcc5ec210d7d200Evan Cheng *((intptr_t*)RelocPos) |= ResultPtr; 287a7b3e7c33f1ef7be844fde18dcd9e24afdc97748Evan Cheng break; 288a7b3e7c33f1ef7be844fde18dcd9e24afdc97748Evan Cheng } 2890f63ae111d5a509911fc61246c1acc62f8c58f18Evan Cheng case ARM::reloc_arm_jt_base: { 2900f63ae111d5a509911fc61246c1acc62f8c58f18Evan Cheng // JT base - (instruction addr + 8) 2910f63ae111d5a509911fc61246c1acc62f8c58f18Evan Cheng ResultPtr = ResultPtr - (intptr_t)RelocPos - 8; 292668d0df68e2c40e4f4073535afcc5ec210d7d200Evan Cheng *((intptr_t*)RelocPos) |= ResultPtr; 2930f63ae111d5a509911fc61246c1acc62f8c58f18Evan Cheng break; 2940f63ae111d5a509911fc61246c1acc62f8c58f18Evan Cheng } 295a7b3e7c33f1ef7be844fde18dcd9e24afdc97748Evan Cheng } 296a7b3e7c33f1ef7be844fde18dcd9e24afdc97748Evan Cheng } 297f17a25c88b892d30c2b41ba7ecdfbdfb2b4be9cDan Gohman} 298