125b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* PPC specific symbolic name handling. 225b3c049e70834cf33790a28643ab058b507b35cBen Cheng Copyright (C) 2004, 2005, 2007 Red Hat, Inc. 325b3c049e70834cf33790a28643ab058b507b35cBen Cheng This file is part of Red Hat elfutils. 425b3c049e70834cf33790a28643ab058b507b35cBen Cheng Written by Ulrich Drepper <drepper@redhat.com>, 2004. 525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 625b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat elfutils is free software; you can redistribute it and/or modify 725b3c049e70834cf33790a28643ab058b507b35cBen Cheng it under the terms of the GNU General Public License as published by the 825b3c049e70834cf33790a28643ab058b507b35cBen Cheng Free Software Foundation; version 2 of the License. 925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 1025b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat elfutils is distributed in the hope that it will be useful, but 1125b3c049e70834cf33790a28643ab058b507b35cBen Cheng WITHOUT ANY WARRANTY; without even the implied warranty of 1225b3c049e70834cf33790a28643ab058b507b35cBen Cheng MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 1325b3c049e70834cf33790a28643ab058b507b35cBen Cheng General Public License for more details. 1425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 1525b3c049e70834cf33790a28643ab058b507b35cBen Cheng You should have received a copy of the GNU General Public License along 1625b3c049e70834cf33790a28643ab058b507b35cBen Cheng with Red Hat elfutils; if not, write to the Free Software Foundation, 1725b3c049e70834cf33790a28643ab058b507b35cBen Cheng Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. 1825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 1925b3c049e70834cf33790a28643ab058b507b35cBen Cheng Red Hat elfutils is an included package of the Open Invention Network. 2025b3c049e70834cf33790a28643ab058b507b35cBen Cheng An included package of the Open Invention Network is a package for which 2125b3c049e70834cf33790a28643ab058b507b35cBen Cheng Open Invention Network licensees cross-license their patents. No patent 2225b3c049e70834cf33790a28643ab058b507b35cBen Cheng license is granted, either expressly or impliedly, by designation as an 2325b3c049e70834cf33790a28643ab058b507b35cBen Cheng included package. Should you wish to participate in the Open Invention 2425b3c049e70834cf33790a28643ab058b507b35cBen Cheng Network licensing program, please visit www.openinventionnetwork.com 2525b3c049e70834cf33790a28643ab058b507b35cBen Cheng <http://www.openinventionnetwork.com>. */ 2625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 2725b3c049e70834cf33790a28643ab058b507b35cBen Cheng#ifdef HAVE_CONFIG_H 2825b3c049e70834cf33790a28643ab058b507b35cBen Cheng# include <config.h> 2925b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif 3025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3125b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <assert.h> 3225b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <elf.h> 3325b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <stddef.h> 3425b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <string.h> 3525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3625b3c049e70834cf33790a28643ab058b507b35cBen Cheng#define BACKEND ppc_ 3725b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include "libebl_CPU.h" 3825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 4025b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Check for the simple reloc types. */ 4125b3c049e70834cf33790a28643ab058b507b35cBen ChengElf_Type 4225b3c049e70834cf33790a28643ab058b507b35cBen Chengppc_reloc_simple_type (Ebl *ebl __attribute__ ((unused)), int type) 4325b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 4425b3c049e70834cf33790a28643ab058b507b35cBen Cheng switch (type) 4525b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 4625b3c049e70834cf33790a28643ab058b507b35cBen Cheng case R_PPC_ADDR32: 4725b3c049e70834cf33790a28643ab058b507b35cBen Cheng case R_PPC_UADDR32: 4825b3c049e70834cf33790a28643ab058b507b35cBen Cheng return ELF_T_WORD; 4925b3c049e70834cf33790a28643ab058b507b35cBen Cheng case R_PPC_UADDR16: 5025b3c049e70834cf33790a28643ab058b507b35cBen Cheng return ELF_T_HALF; 5125b3c049e70834cf33790a28643ab058b507b35cBen Cheng default: 5225b3c049e70834cf33790a28643ab058b507b35cBen Cheng return ELF_T_NUM; 5325b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 5425b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 5525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5725b3c049e70834cf33790a28643ab058b507b35cBen Chengconst char * 5825b3c049e70834cf33790a28643ab058b507b35cBen Chengppc_dynamic_tag_name (int64_t tag, char *buf __attribute__ ((unused)), 5925b3c049e70834cf33790a28643ab058b507b35cBen Cheng size_t len __attribute__ ((unused))) 6025b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 6125b3c049e70834cf33790a28643ab058b507b35cBen Cheng switch (tag) 6225b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 6325b3c049e70834cf33790a28643ab058b507b35cBen Cheng case DT_PPC_GOT: 6425b3c049e70834cf33790a28643ab058b507b35cBen Cheng return "PPC_GOT"; 6525b3c049e70834cf33790a28643ab058b507b35cBen Cheng default: 6625b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 6725b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 6825b3c049e70834cf33790a28643ab058b507b35cBen Cheng return NULL; 6925b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 7025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 7125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 7225b3c049e70834cf33790a28643ab058b507b35cBen Chengbool 7325b3c049e70834cf33790a28643ab058b507b35cBen Chengppc_dynamic_tag_check (int64_t tag) 7425b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 7525b3c049e70834cf33790a28643ab058b507b35cBen Cheng return tag == DT_PPC_GOT; 7625b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 7725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 7825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 7925b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Look for DT_PPC_GOT. */ 8025b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic bool 8125b3c049e70834cf33790a28643ab058b507b35cBen Chengfind_dyn_got (Elf *elf, GElf_Ehdr *ehdr, GElf_Addr *addr) 8225b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 8325b3c049e70834cf33790a28643ab058b507b35cBen Cheng for (int i = 0; i < ehdr->e_phnum; ++i) 8425b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 8525b3c049e70834cf33790a28643ab058b507b35cBen Cheng GElf_Phdr phdr_mem; 8625b3c049e70834cf33790a28643ab058b507b35cBen Cheng GElf_Phdr *phdr = gelf_getphdr (elf, i, &phdr_mem); 8725b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (phdr == NULL || phdr->p_type != PT_DYNAMIC) 8825b3c049e70834cf33790a28643ab058b507b35cBen Cheng continue; 8925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 9025b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf_Scn *scn = gelf_offscn (elf, phdr->p_offset); 9125b3c049e70834cf33790a28643ab058b507b35cBen Cheng GElf_Shdr shdr_mem; 9225b3c049e70834cf33790a28643ab058b507b35cBen Cheng GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); 9325b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf_Data *data = elf_getdata (scn, NULL); 9425b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (shdr != NULL && shdr->sh_type == SHT_DYNAMIC && data != NULL) 9525b3c049e70834cf33790a28643ab058b507b35cBen Cheng for (unsigned int j = 0; j < shdr->sh_size / shdr->sh_entsize; ++j) 9625b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 9725b3c049e70834cf33790a28643ab058b507b35cBen Cheng GElf_Dyn dyn_mem; 9825b3c049e70834cf33790a28643ab058b507b35cBen Cheng GElf_Dyn *dyn = gelf_getdyn (data, j, &dyn_mem); 9925b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (dyn != NULL && dyn->d_tag == DT_PPC_GOT) 10025b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 10125b3c049e70834cf33790a28643ab058b507b35cBen Cheng *addr = dyn->d_un.d_ptr; 10225b3c049e70834cf33790a28643ab058b507b35cBen Cheng return true; 10325b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 10425b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 10525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 10625b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* There is only one PT_DYNAMIC entry. */ 10725b3c049e70834cf33790a28643ab058b507b35cBen Cheng break; 10825b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 10925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 11025b3c049e70834cf33790a28643ab058b507b35cBen Cheng return false; 11125b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 11225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 11325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 11425b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Check whether given symbol's st_value and st_size are OK despite failing 11525b3c049e70834cf33790a28643ab058b507b35cBen Cheng normal checks. */ 11625b3c049e70834cf33790a28643ab058b507b35cBen Chengbool 11725b3c049e70834cf33790a28643ab058b507b35cBen Chengppc_check_special_symbol (Elf *elf, GElf_Ehdr *ehdr, const GElf_Sym *sym, 11825b3c049e70834cf33790a28643ab058b507b35cBen Cheng const char *name, const GElf_Shdr *destshdr) 11925b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 12025b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (name == NULL) 12125b3c049e70834cf33790a28643ab058b507b35cBen Cheng return false; 12225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 12325b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (strcmp (name, "_GLOBAL_OFFSET_TABLE_") == 0) 12425b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 12525b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* In -msecure-plt mode, DT_PPC_GOT is present and must match. */ 12625b3c049e70834cf33790a28643ab058b507b35cBen Cheng GElf_Addr gotaddr; 12725b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (find_dyn_got (elf, ehdr, &gotaddr)) 12825b3c049e70834cf33790a28643ab058b507b35cBen Cheng return sym->st_value == gotaddr; 12925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 13025b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* In -mbss-plt mode, any place in the section is valid. */ 13125b3c049e70834cf33790a28643ab058b507b35cBen Cheng return true; 13225b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 13325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 13425b3c049e70834cf33790a28643ab058b507b35cBen Cheng const char *sname = elf_strptr (elf, ehdr->e_shstrndx, destshdr->sh_name); 13525b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (sname == NULL) 13625b3c049e70834cf33790a28643ab058b507b35cBen Cheng return false; 13725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 13825b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (strcmp (name, "_SDA_BASE_") == 0) 13925b3c049e70834cf33790a28643ab058b507b35cBen Cheng return (strcmp (sname, ".sdata") == 0 14025b3c049e70834cf33790a28643ab058b507b35cBen Cheng && sym->st_value == destshdr->sh_addr + 0x8000 14125b3c049e70834cf33790a28643ab058b507b35cBen Cheng && sym->st_size == 0); 14225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 14325b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (strcmp (name, "_SDA2_BASE_") == 0) 14425b3c049e70834cf33790a28643ab058b507b35cBen Cheng return (strcmp (sname, ".sdata2") == 0 14525b3c049e70834cf33790a28643ab058b507b35cBen Cheng && sym->st_value == destshdr->sh_addr + 0x8000 14625b3c049e70834cf33790a28643ab058b507b35cBen Cheng && sym->st_size == 0); 14725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 14825b3c049e70834cf33790a28643ab058b507b35cBen Cheng return false; 14925b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 15025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 15125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 15225b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Check if backend uses a bss PLT in this file. */ 15325b3c049e70834cf33790a28643ab058b507b35cBen Chengbool 15425b3c049e70834cf33790a28643ab058b507b35cBen Chengppc_bss_plt_p (Elf *elf, GElf_Ehdr *ehdr) 15525b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 15625b3c049e70834cf33790a28643ab058b507b35cBen Cheng GElf_Addr addr; 15725b3c049e70834cf33790a28643ab058b507b35cBen Cheng return ! find_dyn_got (elf, ehdr, &addr); 15825b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 159