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/* PPC specific symbolic name handling.
Copyright (C) 2004, 2005 Red Hat, Inc.
Written by Ulrich Drepper <drepper@redhat.com>, 2004.
This program is Open Source software; you can redistribute it and/or
modify it under the terms of the Open Software License version 1.0 as
published by the Open Source Initiative.
You should have received a copy of the Open Software License along
with this program; if not, you may obtain a copy of the Open Software
License version 1.0 from http://www.opensource.org/licenses/osl.php or
by writing the Open Source Initiative c/o Lawrence Rosen, Esq.,
3001 King Ranch Road, Ukiah, CA 95482. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <assert.h>
#include <elf.h>
#include <stddef.h>
#include <string.h>
#define BACKEND ppc_
#include "libebl_CPU.h"
/* Check for the simple reloc types. */
Elf_Type
ppc_reloc_simple_type (Ebl *ebl __attribute__ ((unused)), int type)
{
switch (type)
{
case R_PPC_ADDR32:
case R_PPC_UADDR32:
return ELF_T_WORD;
case R_PPC_UADDR16:
return ELF_T_HALF;
default:
return ELF_T_NUM;
}
}
const char *
ppc_dynamic_tag_name (int64_t tag, char *buf __attribute__ ((unused)),
size_t len __attribute__ ((unused)))
{
switch (tag)
{
case DT_PPC_GOT:
return "PPC_GOT";
default:
break;
}
return NULL;
}
bool
ppc_dynamic_tag_check (int64_t tag)
{
return tag == DT_PPC_GOT;
}
/* Look for DT_PPC_GOT. */
static bool
find_dyn_got (Elf *elf, GElf_Ehdr *ehdr, GElf_Addr *addr)
{
for (int i = 0; i < ehdr->e_phnum; ++i)
{
GElf_Phdr phdr_mem;
GElf_Phdr *phdr = gelf_getphdr (elf, i, &phdr_mem);
if (phdr == NULL || phdr->p_type != PT_DYNAMIC)
continue;
Elf_Scn *scn = gelf_offscn (elf, phdr->p_offset);
GElf_Shdr shdr_mem;
GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
Elf_Data *data = elf_getdata (scn, NULL);
if (shdr != NULL && shdr->sh_type == SHT_DYNAMIC && data != NULL)
for (unsigned int j = 0; j < shdr->sh_size / shdr->sh_entsize; ++j)
{
GElf_Dyn dyn_mem;
GElf_Dyn *dyn = gelf_getdyn (data, j, &dyn_mem);
if (dyn != NULL && dyn->d_tag == DT_PPC_GOT)
{
*addr = dyn->d_un.d_ptr;
return true;
}
}
/* There is only one PT_DYNAMIC entry. */
break;
}
return false;
}
/* Check whether given symbol's st_value and st_size are OK despite failing
normal checks. */
bool
ppc_check_special_symbol (Elf *elf, GElf_Ehdr *ehdr, const GElf_Sym *sym,
const char *name, const GElf_Shdr *destshdr)
{
if (name == NULL)
return false;
if (strcmp (name, "_GLOBAL_OFFSET_TABLE_") == 0)
{
GElf_Addr gotaddr;
if (find_dyn_got (elf, ehdr, &gotaddr))
return sym->st_value == gotaddr;
return sym->st_value == destshdr->sh_addr + 4;
}
const char *sname = elf_strptr (elf, ehdr->e_shstrndx, destshdr->sh_name);
if (sname == NULL)
return false;
if (strcmp (name, "_SDA_BASE_") == 0)
return (strcmp (sname, ".sdata") == 0
&& sym->st_value == destshdr->sh_addr + 0x8000
&& sym->st_size == 0);
if (strcmp (name, "_SDA2_BASE_") == 0)
return (strcmp (sname, ".sdata2") == 0
&& sym->st_value == destshdr->sh_addr + 0x8000
&& sym->st_size == 0);
return false;
}
/* Check if backend uses a bss PLT in this file. */
bool
ppc_bss_plt_p (Elf *elf, GElf_Ehdr *ehdr)
{
GElf_Addr addr;
return ! find_dyn_got (elf, ehdr, &addr);
}
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