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/* $OpenBSD: elf.c,v 1.6 2004/05/04 23:07:53 mickey Exp $ */
/*
* Copyright (c) 2003 Michael Shalayeff
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#if ELF_TARG_CLASS == ELFCLASS32
#define swap_addr swap32
#define swap_off swap32
#define swap_sword swap32
#define swap_word swap32
#define swap_sxword swap32
#define swap_xword swap32
#define swap_half swap16
#define swap_quarter swap16
#elif ELF_TARG_CLASS == ELFCLASS64
#define swap_addr swap64
#define swap_off swap64
#ifdef __alpha__
#define swap_sword swap64
#define swap_word swap64
#else
#define swap_sword swap32
#define swap_word swap32
#endif
#define swap_sxword swap64
#define swap_xword swap64
#define swap_half swap64
#define swap_quarter swap16
#else
#error "Unsupported ELF class"
#endif
#define ELF_SBSS ".sbss"
#define ELF_PLT ".plt"
int
elf_fix_header(Elf_Ehdr *eh)
{
/* nothing to do */
if (eh->e_ident[EI_DATA] == ELF_TARG_DATA)
return (0);
eh->e_type = swap16(eh->e_type);
eh->e_machine = swap16(eh->e_machine);
eh->e_version = swap32(eh->e_version);
eh->e_entry = swap_addr(eh->e_entry);
eh->e_phoff = swap_off(eh->e_phoff);
eh->e_shoff = swap_off(eh->e_shoff);
eh->e_flags = swap32(eh->e_flags);
eh->e_ehsize = swap16(eh->e_ehsize);
eh->e_phentsize = swap16(eh->e_phentsize);
eh->e_phnum = swap16(eh->e_phnum);
eh->e_shentsize = swap16(eh->e_shentsize);
eh->e_shnum = swap16(eh->e_shnum);
eh->e_shstrndx = swap16(eh->e_shstrndx);
return (1);
}
int
elf_fix_shdrs(Elf_Ehdr *eh, Elf_Shdr *shdr)
{
int i;
/* nothing to do */
if (eh->e_ident[EI_DATA] == ELF_TARG_DATA)
return (0);
for (i = eh->e_shnum; i--; shdr++) {
shdr->sh_name = swap32(shdr->sh_name);
shdr->sh_type = swap32(shdr->sh_type);
shdr->sh_flags = swap_xword(shdr->sh_flags);
shdr->sh_addr = swap_addr(shdr->sh_addr);
shdr->sh_offset = swap_off(shdr->sh_offset);
shdr->sh_size = swap_xword(shdr->sh_size);
shdr->sh_link = swap32(shdr->sh_link);
shdr->sh_info = swap32(shdr->sh_info);
shdr->sh_addralign = swap_xword(shdr->sh_addralign);
shdr->sh_entsize = swap_xword(shdr->sh_entsize);
}
return (1);
}
int
elf_fix_phdrs(Elf_Ehdr *eh, Elf_Phdr *phdr)
{
int i;
/* nothing to do */
if (eh->e_ident[EI_DATA] == ELF_TARG_DATA)
return (0);
for (i = eh->e_phnum; i--; phdr++) {
phdr->p_type = swap32(phdr->p_type);
phdr->p_flags = swap32(phdr->p_flags);
phdr->p_offset = swap_off(phdr->p_offset);
phdr->p_vaddr = swap_addr(phdr->p_vaddr);
phdr->p_paddr = swap_addr(phdr->p_paddr);
phdr->p_filesz = swap_xword(phdr->p_filesz);
phdr->p_memsz = swap_xword(phdr->p_memsz);
phdr->p_align = swap_xword(phdr->p_align);
}
return (1);
}
int
elf_fix_sym(Elf_Ehdr *eh, Elf_Sym *sym)
{
/* nothing to do */
if (eh->e_ident[EI_DATA] == ELF_TARG_DATA)
return (0);
sym->st_name = swap32(sym->st_name);
sym->st_shndx = swap16(sym->st_shndx);
sym->st_value = swap_addr(sym->st_value);
sym->st_size = swap_xword(sym->st_size);
return (1);
}
/*
* Devise nlist's type from Elf_Sym.
* XXX this task is done as well in libc and kvm_mkdb.
*/
int
elf2nlist(Elf_Sym *sym, Elf_Ehdr *eh, Elf_Shdr *shdr, char *shstr, struct nlist *np)
{
const char *sn;
if (sym->st_shndx < eh->e_shnum)
sn = shstr + shdr[sym->st_shndx].sh_name;
else
sn = "";
#if 0
{
extern char *stab;
printf("%d:%s %d %s\n", sym->st_shndx, sn,
ELF_ST_TYPE(sym->st_info), stab + sym->st_name);
}
#endif
switch(ELF_ST_TYPE(sym->st_info)) {
case STT_NOTYPE:
switch (sym->st_shndx) {
case SHN_UNDEF:
np->n_type = N_UNDF | N_EXT;
break;
case SHN_ABS:
np->n_type = N_ABS;
break;
case SHN_COMMON:
np->n_type = N_COMM;
break;
default:
if (sym->st_shndx >= eh->e_shnum)
np->n_type = N_COMM | N_EXT;
else if (!strcmp(sn, ELF_TEXT))
np->n_type = N_TEXT;
else if (!strcmp(sn, ELF_RODATA)) {
np->n_type = N_DATA;
np->n_other = 'r';
} else if (!strcmp(sn, ELF_DATA))
np->n_type = N_DATA;
else if (!strncmp(sn, ELF_GOT, sizeof(ELF_GOT) - 1))
np->n_type = N_DATA;
else if (!strncmp(sn, ELF_PLT, sizeof(ELF_PLT) - 1))
np->n_type = N_DATA;
else if (!strcmp(sn, ELF_BSS))
np->n_type = N_BSS;
else if (!strcmp(sn, ELF_SBSS))
np->n_type = N_BSS;
else
np->n_other = '?';
break;
}
break;
case STT_FUNC:
np->n_type = N_TEXT;
if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
np->n_type = N_INDR;
np->n_other = 'W';
} else if (sym->st_shndx == SHN_UNDEF)
np->n_type = N_UNDF | N_EXT;
else if (strcmp(sn, ELF_INIT) &&
strcmp(sn, ELF_TEXT) &&
strcmp(sn, ELF_FINI)) /* XXX GNU compat */
np->n_other = '?';
break;
case STT_OBJECT:
np->n_type = N_DATA;
if (sym->st_shndx == SHN_ABS)
np->n_type = N_ABS;
if (sym->st_shndx == SHN_COMMON)
np->n_type = N_COMM;
else if (sym->st_shndx >= eh->e_shnum)
break;
else if (!strcmp(sn, ELF_SBSS))
np->n_type = N_BSS;
else if (!strcmp(sn, ELF_BSS))
np->n_type = N_BSS;
else if (!strcmp(sn, ELF_RODATA))
np->n_other = 'r';
break;
case STT_FILE:
np->n_type = N_FN | N_EXT;
break;
/* XXX how about cross-nm then ? */
#ifdef STT_PARISC_MILLI
case STT_PARISC_MILLI:
np->n_type = N_TEXT;
break;
#endif
default:
np->n_other = '?';
break;
}
if (np->n_type != N_UNDF && ELF_ST_BIND(sym->st_info) != STB_LOCAL) {
np->n_type |= N_EXT;
if (np->n_other)
np->n_other = toupper(np->n_other);
}
return (0);
}
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