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/* $OpenBSD: exec_elf.c,v 1.4 1998/08/27 20:38:15 mickey Exp $ */
/*
* Copyright (c) 1998 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Michael Shalayeff.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without 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.
*/
#include "libsa.h"
#include <lib/libsa/exec.h>
#include <sys/exec_elf.h>
int
elf_probe(fd, hdr)
int fd;
union x_header *hdr;
{
return IS_ELF(hdr->x_elf);
}
int
elf_load(fd, xp)
int fd;
struct x_param *xp;
{
register Elf32_Ehdr *ehdr = (Elf32_Ehdr *)xp->xp_hdr;
register Elf32_Phdr *ph;
register Elf32_Shdr *sh;
Elf32_Phdr phdr[8]; /* XXX hope this is enough */
Elf32_Shdr shdr[32]; /* XXX hope this is enough */
size_t phsize, shsize;
register u_int pa;
#ifdef EXEC_DEBUG
if (debug)
printf("id=%x.%c%c%c.%x.%x, type=%x, mach=%x, ver=%x, size=%d\n"
"\tep=%x, flgs=%x, ph=%x[%dx%d], sh=%x[%dx%d], str=%x\n",
ehdr->e_ident[0], ehdr->e_ident[1], ehdr->e_ident[2],
ehdr->e_ident[3], ehdr->e_ident[4], ehdr->e_ident[5],
ehdr->e_type, ehdr->e_machine, ehdr->e_version,
ehdr->e_ehsize, ehdr->e_entry, ehdr->e_flags,
ehdr->e_phoff, ehdr->e_phnum, ehdr->e_phentsize,
ehdr->e_shoff, ehdr->e_shnum, ehdr->e_shentsize,
ehdr->e_shstrndx);
#endif
xp->xp_entry = ehdr->e_entry;
if (lseek(fd, ehdr->e_phoff, SEEK_SET) <= 0) {
#ifdef EXEC_DEBUG
if (debug)
printf("lseek failed (%d)\n", errno);
#endif
return -1;
}
phsize = ehdr->e_phnum * ehdr->e_phentsize;
if (phsize > sizeof(phdr) || read(fd, phdr, phsize) != phsize) {
#ifdef EXEC_DEBUG
if (debug)
printf("phdr read failed (%d)\n", errno);
#endif
return -1;
}
pa = 0;
for (ph = phdr; ph < &phdr[ehdr->e_phnum]; ph++) {
#ifdef EXEC_DEBUG
if (debug)
printf("ph%d: type=%x, off==%d, va=%x, fs=%d, ms=%d, "
"flags=%x\n", (ph - phdr), ph->p_type,
ph->p_offset, ph->p_vaddr, ph->p_filesz,
ph->p_memsz, ph->p_flags);
#endif
if (ph->p_filesz && ph->p_flags & PF_X) {
pa = ph->p_vaddr;
xp->text.addr = 0;
xp->text.size = ph->p_filesz;
xp->text.foff = ph->p_offset;
} else if (ph->p_filesz && ph->p_flags & PF_W) {
xp->data.addr = ph->p_vaddr - pa;
xp->data.size = ph->p_filesz;
xp->data.foff = ph->p_offset;
if (ph->p_filesz < ph->p_memsz) {
xp->bss.addr = ph->p_vaddr + ph->p_filesz - pa;
xp->bss.size = ph->p_memsz - ph->p_filesz;
xp->bss.foff = 0;
}
} else if (!ph->p_filesz) {
xp->bss.addr = ph->p_vaddr - pa;
xp->bss.size = ph->p_memsz;
xp->bss.foff = 0;
}
}
if (lseek(fd, ehdr->e_shoff, SEEK_SET) <= 0) {
#ifdef EXEC_DEBUG
if (debug)
printf("lseek failed (%d)\n", errno);
#endif
return -1;
}
/* calc symbols location, scanning section headers */
shsize = ehdr->e_shnum * ehdr->e_shentsize;
sh = shdr;
#if notyet
if (shsize > sizeof(shdr) || read(fd, shdr, shsize) != shsize) {
#ifdef EXEC_DEBUG
if (debug)
printf("shdr read failed (%d)\n", errno);
#endif
return -1;
}
for (sh = shdr; sh < &shdr[ehdr->e_shnum]; sh++) {
switch (sh->sh_type) {
case SHT_SYMTAB:
xp->sym.foff = sh->sh_offset;
xp->sym.size = sh->sh_size;
case SHT_STRTAB:
xp->str.foff = sh->sh_offset;
xp->str.size = sh->sh_size;
}
break;
}
#endif
return 0;
}
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