272 lines
6.7 KiB
C
272 lines
6.7 KiB
C
/*-
|
|
* Copyright (c) 1999 Marcel Moolenaar
|
|
* 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
|
|
* in this position and unchanged.
|
|
* 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.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software withough specific prior written permission
|
|
*
|
|
* 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 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 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#if defined(arch_i386)
|
|
#include <sys/elf32.h>
|
|
#define __ELF_WORD_SIZE 32
|
|
#elif defined(arch_alpha)
|
|
#include <sys/elf64.h>
|
|
#define __ELF_WORD_SIZE 64
|
|
#else
|
|
#error unknown or missing architecture
|
|
#endif
|
|
#include <sys/elf_generic.h>
|
|
|
|
#include <err.h>
|
|
#include <fcntl.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
const char s_data[] = ".data";
|
|
const char s_strtab[] = ".strtab";
|
|
const char s_symtab[] = ".symtab";
|
|
const char assym[] = "assym_";
|
|
|
|
int fd;
|
|
char *objfile;
|
|
Elf_Ehdr ehdr;
|
|
Elf_Shdr *shdr;
|
|
char *shstr;
|
|
|
|
int
|
|
my_byte_order(void)
|
|
{
|
|
static unsigned short s = 0xbbaa;
|
|
int byte0;
|
|
|
|
byte0 = *(unsigned char *)&s;
|
|
if (byte0 == 0xaa)
|
|
return (ELFDATA2LSB);
|
|
else if (byte0 == 0xbb)
|
|
return (ELFDATA2MSB);
|
|
return (ELFDATANONE);
|
|
}
|
|
|
|
void *
|
|
read_section(int index)
|
|
{
|
|
void *buf;
|
|
size_t size;
|
|
ssize_t bytes;
|
|
|
|
size = shdr[index].sh_size;
|
|
buf = malloc(size);
|
|
if (buf == NULL)
|
|
return (NULL);
|
|
if (lseek(fd, shdr[index].sh_offset, SEEK_SET) == -1)
|
|
return (NULL);
|
|
bytes = read(fd, buf, size);
|
|
if (bytes == -1)
|
|
return (NULL);
|
|
if (bytes != size)
|
|
warnx("%s: section %d partially read", objfile, index);
|
|
return (buf);
|
|
}
|
|
|
|
int section_index(const char *section)
|
|
{
|
|
int i;
|
|
|
|
for (i = 1; i < ehdr.e_shnum; i++)
|
|
if (!strcmp(section, shstr + shdr[i].sh_name))
|
|
return (i);
|
|
return (-1);
|
|
}
|
|
|
|
char *
|
|
filter(char *name)
|
|
{
|
|
char *dot;
|
|
|
|
name += sizeof(assym) - 1;
|
|
dot = strchr(name, '.');
|
|
if (dot != NULL)
|
|
*dot = '\0';
|
|
return (name);
|
|
}
|
|
|
|
void usage(void)
|
|
{
|
|
fprintf(stderr, "usage: genassym [-o outfile] objfile\n");
|
|
exit(1);
|
|
/* NOT REACHED */
|
|
}
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
Elf_Sym *sym;
|
|
char *data, *name, *symbols;
|
|
char *outfile;
|
|
void *valp;
|
|
size_t size;
|
|
ssize_t bytes;
|
|
int ch, i, numsym, warn_ld_bug;
|
|
int si_data, si_strtab, si_symtab;
|
|
u_int64_t value;
|
|
|
|
outfile = NULL;
|
|
warn_ld_bug = 1;
|
|
|
|
while ((ch = getopt(argc, argv, "o:")) != -1) {
|
|
switch (ch) {
|
|
case 'o':
|
|
outfile = optarg;
|
|
break;
|
|
default:
|
|
usage();
|
|
/* NOT REACHED */
|
|
}
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
if (argc == 0) {
|
|
usage();
|
|
/* NOT REACHED */
|
|
}
|
|
if (argc > 1)
|
|
warnx("ignoring trailing arguments");
|
|
|
|
objfile = argv[0];
|
|
fd = open(objfile, O_RDONLY);
|
|
if (fd == -1)
|
|
err(1, "%s", objfile);
|
|
|
|
bytes = read(fd, &ehdr, sizeof(ehdr));
|
|
if (bytes == -1)
|
|
err(1, "%s", objfile);
|
|
if (bytes != sizeof(ehdr) ||
|
|
ehdr.e_ident[EI_MAG0] != ELFMAG0 ||
|
|
ehdr.e_ident[EI_MAG1] != ELFMAG1 ||
|
|
ehdr.e_ident[EI_MAG2] != ELFMAG2 ||
|
|
ehdr.e_ident[EI_MAG3] != ELFMAG3)
|
|
errx(1, "%s: not an ELF file", objfile);
|
|
if (ehdr.e_ident[EI_VERSION] != EV_CURRENT)
|
|
errx(1, "%s: unsupported ELF version", objfile);
|
|
if (ehdr.e_ident[EI_DATA] != my_byte_order())
|
|
errx(1, "%s: unsupported byte order", objfile);
|
|
if (ehdr.e_shoff == 0)
|
|
errx(1, "%s: no section table", objfile);
|
|
if (ehdr.e_shstrndx == SHN_UNDEF)
|
|
errx(1, "%s: no section name string table", objfile);
|
|
|
|
size = sizeof(*shdr) * ehdr.e_shnum;
|
|
shdr = malloc(size);
|
|
if (shdr == NULL)
|
|
err(1, "malloc");
|
|
if (lseek(fd, ehdr.e_shoff, SEEK_SET) == -1)
|
|
err(1, "%s", objfile);
|
|
bytes = read(fd, shdr, size);
|
|
if (bytes == -1)
|
|
err(1, "%s", objfile);
|
|
if (bytes != size)
|
|
errx(1, "%s: truncated section table", objfile);
|
|
|
|
shstr = read_section(ehdr.e_shstrndx);
|
|
if (shstr == NULL)
|
|
err(1, "%s[%d]", objfile, ehdr.e_shstrndx);
|
|
|
|
si_data = section_index(s_data);
|
|
if (si_data == -1)
|
|
errx(1, "%s: section %s not present", objfile, s_data);
|
|
data = read_section(si_data);
|
|
if (data == NULL)
|
|
err(1, "%s[%d]", objfile, si_data);
|
|
|
|
si_strtab = section_index(s_strtab);
|
|
if (si_strtab == -1)
|
|
errx(1, "%s: section %s not present", objfile, s_strtab);
|
|
symbols = read_section(si_strtab);
|
|
if (symbols == NULL)
|
|
err(1, "%s[%d]", objfile, si_strtab);
|
|
|
|
si_symtab = section_index(s_symtab);
|
|
if (si_symtab == -1)
|
|
errx(1, "%s: section %s not present", objfile, s_symtab);
|
|
sym = read_section(si_symtab);
|
|
if (sym == NULL)
|
|
err(1, "%s[%d]", objfile, si_symtab);
|
|
|
|
numsym = shdr[si_symtab].sh_size / sizeof(*sym);
|
|
|
|
if (outfile != NULL)
|
|
freopen(outfile, "w", stdout);
|
|
|
|
for (i = 0; i < numsym; i++) {
|
|
name = symbols + sym[i].st_name;
|
|
if (sym[i].st_shndx == si_data &&
|
|
!strncmp(name, assym, sizeof(assym) - 1)) {
|
|
valp = (void*)(data + sym[i].st_value);
|
|
/*
|
|
* XXX - ld(1) on Alpha doesn't store the size of
|
|
* the symbol in the object file. The following
|
|
* fix handles this case quite genericly. It
|
|
* assumes that the symbols have the same size as
|
|
* a word on that architecture, determined by the
|
|
* word size in the ELF object file.
|
|
*/
|
|
if (sym[i].st_size == 0) {
|
|
sym[i].st_size = __ELF_WORD_SIZE >> 3;
|
|
if (warn_ld_bug) {
|
|
warnx("%s: symbol sizes not properly"
|
|
" set", objfile);
|
|
warn_ld_bug = 0;
|
|
}
|
|
}
|
|
switch (sym[i].st_size) {
|
|
case 1:
|
|
value = *(u_int8_t*)valp;
|
|
break;
|
|
case 2:
|
|
value = *(u_int16_t*)valp;
|
|
break;
|
|
case 4:
|
|
value = *(u_int32_t*)valp;
|
|
break;
|
|
case 8:
|
|
value = *(u_int64_t*)valp;
|
|
break;
|
|
default:
|
|
warnx("unsupported size (%lld) for symbol %s",
|
|
(long long)sym[i].st_size, filter(name));
|
|
continue;
|
|
}
|
|
fprintf(stdout, "#define\t%s 0x%llx\n", filter(name),
|
|
(long long)value);
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|