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Diffstat (limited to 'src/stabs.c')
| -rw-r--r-- | src/stabs.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/src/stabs.c b/src/stabs.c new file mode 100644 index 0000000..c0a5a6a --- /dev/null +++ b/src/stabs.c @@ -0,0 +1,188 @@ +/* Copyright (C) 2001, 2005, 2006 Red Hat, Inc. + Written by Jakub Jelinek <jakub@redhat.com>, 2001. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software Foundation, + Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +#include <config.h> +#include <assert.h> +#include <byteswap.h> +#include <endian.h> +#include <error.h> + +#include "prelink.h" + +#define N_ZERO 0x00 +#define N_GSYM 0x20 +#define N_FNAME 0x22 +#define N_FUN 0x24 +#define N_STSYM 0x26 +#define N_LCSYM 0x28 +#define N_MAIN 0x2a +#define N_BNSYM 0x2e +#define N_PC 0x30 +#define N_NSYMS 0x32 +#define N_NOMAP 0x34 +#define N_OBJ 0x38 +#define N_OPT 0x3c +#define N_RSYM 0x40 +#define N_M2C 0x42 +#define N_SLINE 0x44 +#define N_DSLINE 0x46 +#define N_BSLINE 0x48 +#define N_BROWS 0x48 +#define N_DEFD 0x4a +#define N_ENSYM 0x4e +#define N_EHDECL 0x50 +#define N_MOD2 0x50 +#define N_CATCH 0x54 +#define N_SSYM 0x60 +#define N_SO 0x64 +#define N_LSYM 0x80 +#define N_BINCL 0x82 +#define N_SOL 0x84 +#define N_PSYM 0xa0 +#define N_EINCL 0xa2 +#define N_ENTRY 0xa4 +#define N_LBRAC 0xc0 +#define N_EXCL 0xc2 +#define N_SCOPE 0xc4 +#define N_RBRAC 0xe0 +#define N_BCOMM 0xe2 +#define N_ECOMM 0xe4 +#define N_ECOML 0xe8 +#define N_LENG 0xfe + +static uint32_t +read_native (char *p) +{ + return *(uint32_t *)p; +} + +static uint32_t +read_swap (char *p) +{ + return bswap_32 (*(uint32_t *)p); +} + +static void +write_native (char *p, uint32_t v) +{ + *(uint32_t *)p = v; +} + +static void +write_swap (char *p, uint32_t v) +{ + *(uint32_t *)p = bswap_32 (v); +} + +int +adjust_stabs (DSO *dso, int n, GElf_Addr start, GElf_Addr adjust) +{ + Elf_Data *data = NULL; + Elf_Scn *scn = dso->scn[n]; + off_t off; + uint32_t (*read_32) (char *p); + void (*write_32) (char *p, uint32_t v); + uint32_t value; + int sec, type; + + assert (dso->shdr[n].sh_entsize == 12); + data = elf_getdata (scn, NULL); + assert (data != NULL && data->d_buf != NULL); + assert (elf_getdata (scn, data) == NULL); + assert (data->d_off == 0 && data->d_size == dso->shdr[n].sh_size); +#if __BYTE_ORDER == __BIG_ENDIAN + if (dso->ehdr.e_ident[EI_DATA] == ELFDATA2MSB) +#elif __BYTE_ORDER == __LITTLE_ENDIAN + if (dso->ehdr.e_ident[EI_DATA] == ELFDATA2LSB) +#else +# error Not supported host endianess +#endif + { + read_32 = read_native; + write_32 = write_native; + } +#if __BYTE_ORDER == __BIG_ENDIAN + else if (dso->ehdr.e_ident[EI_DATA] == ELFDATA2LSB) +#elif __BYTE_ORDER == __LITTLE_ENDIAN + else if (dso->ehdr.e_ident[EI_DATA] == ELFDATA2MSB) +#endif + { + read_32 = read_swap; + write_32 = write_swap; + } + else + { + error (0, 0, "%s: Wrong ELF data enconding", dso->filename); + return 1; + } + + for (off = 0; off < data->d_size; off += 12) + { + switch ((type = *(uint8_t *)(data->d_buf + off + 4))) + { + case N_FUN: + /* If string is "", N_FUN is function length, otherwise + it is function start address. */ + if (read_32 (data->d_buf + off) == 0) + break; + /* FALLTHROUGH */ + case N_STSYM: + case N_LCSYM: + case N_CATCH: + case N_SO: + case N_SOL: + case N_BNSYM: + case N_ENSYM: + value = read_32 (data->d_buf + off + 8); + sec = addr_to_sec (dso, value); + if (sec != -1) + { + addr_adjust (value, start, adjust); + write_32 (data->d_buf + off + 8, value); + } + break; + /* These should be always 0. */ + case N_GSYM: + case N_BINCL: + case N_EINCL: + case N_EXCL: + case N_BCOMM: + case N_ECOMM: + /* These contain other values. */ + case N_ZERO: + case N_NSYMS: + case N_NOMAP: + case N_RSYM: + case N_LSYM: + case N_PSYM: + case N_OPT: + /* These are relative. */ + case N_LBRAC: + case N_RBRAC: + case N_SLINE: + case N_BSLINE: + case N_DSLINE: + break; + default: + error (0, 0, "%s: Unknown stabs code 0x%02x\n", dso->filename, type); + return 1; + } + } + + elf_flagscn (scn, ELF_C_SET, ELF_F_DIRTY); + return 0; +} |