/* $NetBSD: elf.c,v 1.9 2007/03/05 21:05:01 dogcow Exp $ */
/*-
* Copyright (c) 1999 Shin Takemura.
* All rights reserved.
*
* This software is part of the PocketBSD.
*
* 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 the PocketBSD project
* and its contributors.
* 4. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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 <pbsdboot.h>
#define ELFSIZE 32
//#include <sys/param.h>
//#include <sys/exec.h>
#include <sys/exec_elf.h>
#if 1
#define LOAD_DEBUG_INFO
#define DEBUG_INFO_ALIGN 4096
#define ROUNDUP(a, n) ((((int)(a)) + (n)-1)/(n)*(n))
#endif
static int
scanfile(int fd, void **start, void **end, void **entry, int load);
static long total_bytes = 0;
int
getinfo(int fd, void **start, void **end)
{
return (scanfile(fd, start, end, NULL, 0));
}
int
loadfile(int fd, void **entry)
{
return (scanfile(fd, NULL, NULL, entry, 1));
}
enum {
VMEM_CLEAR, VMEM_LOAD, VMEM_COPY
};
int
vmem_sub(int opr, void* xxx, void *addr, int nbytes, int *byte_count)
{
int n;
void *end_addr, *vaddr;
int count = 0;
int progress = 0;
int fd = (int)xxx;
void *src_addr = (void *)xxx;
debug_printf(TEXT("loadfile_sub(%x-%x, %S)\n"),
addr, addr + nbytes,
opr == VMEM_CLEAR ? "clear" : (opr == VMEM_LOAD ? "load" : "copy"));
for (end_addr = addr + nbytes;
addr < end_addr;
addr += n) {
if ((vaddr = vmem_get(addr, &n)) == NULL) {
debug_printf(TEXT("vmem_get(0x%x) failed.\n"), addr);
msg_printf(MSG_ERROR, whoami, TEXT("vmem_get(0x%x) failed.\n"), addr);
return (-1);
}
if (end_addr < addr + n) {
n = end_addr - addr;
}
switch (opr) {
case VMEM_CLEAR:
memset(vaddr, 0, n);
break;
case VMEM_LOAD:
if (read(fd, vaddr, n) != n) {
debug_printf(TEXT("read segment error.\n"));
msg_printf(MSG_ERROR, whoami, TEXT("read segment error.\n"));
return (-1);
}
break;
case VMEM_COPY:
memcpy(vaddr, src_addr, n);
src_addr += n;
break;
}
if (total_bytes != 0) {
int tmp_progress = *byte_count * 100 / total_bytes;
*byte_count += n;
if (progress != tmp_progress) {
progress = tmp_progress;
if (CheckCancel(progress)) {
return (-1);
}
}
}
}
return (0);
}
static int
scanfile(int fd, void **start, void **end, void **entry, int load)
{
Elf_Ehdr elfx, *elf = &elfx;
int i, first;
long byte_count;
int progress;
Elf_Shdr *shtbl = NULL;
Elf_Phdr *phtbl = NULL;
void *min_addr, *max_addr;
int sh_symidx, sh_stridx;
int dbg_hdr_size = sizeof(Elf_Ehdr) + sizeof(Elf_Shdr) * 2;
if (lseek(fd, 0, SEEK_SET) == -1) {
debug_printf(TEXT("seek error\n"));
msg_printf(MSG_ERROR, whoami, TEXT("seek error.\n"));
goto error_cleanup;
}
if (read(fd, (void*)elf, sizeof(Elf_Ehdr)) != sizeof(Elf_Ehdr)) {
debug_printf(TEXT("read header error\n"));
msg_printf(MSG_ERROR, whoami, TEXT("read header error.\n"));
goto error_cleanup;
}
if ((phtbl = (Elf_Phdr *)alloc(sizeof(*phtbl) * elf->e_phnum)) == NULL ||
(shtbl = (Elf_Shdr *)alloc(sizeof(*shtbl) * elf->e_shnum)) == NULL) {
debug_printf(TEXT("alloc() error\n"));
msg_printf(MSG_ERROR, whoami, TEXT("malloc() error.\n"));
goto error_cleanup;
}
if (lseek(fd, elf->e_phoff, SEEK_SET) == -1) {
debug_printf(TEXT("seek for program header table error\n"));
msg_printf(MSG_ERROR, whoami, TEXT("seek for program header table error.\n"));
goto error_cleanup;
}
if (read(fd, (void *)phtbl, sizeof(Elf_Phdr) * elf->e_phnum)
!= (int)(sizeof(Elf_Phdr) * elf->e_phnum)) {
debug_printf(TEXT("read program header table error\n"));
msg_printf(MSG_ERROR, whoami, TEXT("read program header table error.\n"));
goto error_cleanup;
}
if (lseek(fd, elf->e_shoff, SEEK_SET) == -1) {
debug_printf(TEXT("seek for segment header table error.\n"));
msg_printf(MSG_ERROR, whoami, TEXT("seek for segment header table error.\n"));
goto error_cleanup;
}
if (read(fd, (void *)shtbl, sizeof(Elf_Shdr) * elf->e_shnum)
!= (int)(sizeof(Elf_Shdr) * elf->e_shnum)) {
debug_printf(TEXT("read segment header table error\n"));
msg_printf(MSG_ERROR, whoami, TEXT("read segment header table error.\n"));
goto error_cleanup;
}
/*
* scan program header table
*/
first = 1;
byte_count = 0;
progress = 0;
for (i = 0; i < elf->e_phnum; i++) {
if (phtbl[i].p_type != PT_LOAD) {
continue;
}
if (first || max_addr < (void *)(phtbl[i].p_vaddr + phtbl[i].p_memsz)) {
max_addr = (void *)(phtbl[i].p_vaddr + phtbl[i].p_memsz);
}
if (first || (void *)phtbl[i].p_vaddr < min_addr) {
min_addr = (void *)phtbl[i].p_vaddr;
}
if (load) {
if (lseek(fd, phtbl[i].p_offset, SEEK_SET) == -1) {
debug_printf(TEXT("seek for segment error\n"));
msg_printf(MSG_ERROR, whoami, TEXT("seek for segment error.\n"));
goto error_cleanup;
}
if (vmem_sub(VMEM_LOAD, (void*)fd,
(void *)phtbl[i].p_vaddr,
phtbl[i].p_filesz,
&byte_count) != 0) {
goto error_cleanup;
}
if (vmem_sub(VMEM_CLEAR, NULL,
(void *)phtbl[i].p_vaddr + phtbl[i].p_filesz,
phtbl[i].p_memsz - phtbl[i].p_filesz,
&byte_count) != 0) {
goto error_cleanup;
}
} else {
byte_count += phtbl[i].p_memsz;
}
first = 0;
}
if (first) {
debug_printf(TEXT("can't find loadable segment\n"));
msg_printf(MSG_ERROR, whoami, TEXT("can't find loadable segment\n"));
goto error_cleanup;
}
total_bytes = byte_count;
debug_printf(TEXT("entry=%x addr=%x-%x\n"),
elf->e_entry, min_addr, max_addr);
#ifdef LOAD_DEBUG_INFO
if (pref.load_debug_info) {
/*
* scan section header table
* to search for debugging information
*/
sh_symidx = -1;
sh_stridx = -1;
for (i = 0; i < elf->e_shnum; i++) {
if (shtbl[i].sh_type == SHT_SYMTAB) {
sh_symidx = i;
}
if ((shtbl[i].sh_type == SHT_STRTAB)
&& (shtbl[i].sh_size >= 0x4000)) {
sh_stridx = i;
}
}
if (sh_symidx == -1 || sh_stridx == -1) {
debug_printf(TEXT("debugging information not found\n"));
} else
if (load) {
Elf_Ehdr dbg_eh;
Elf_Shdr dbg_sh[2];
memset(&dbg_eh, 0, sizeof(Elf_Ehdr));
memset(dbg_sh, 0, sizeof(Elf_Shdr) * 2);
memcpy(dbg_eh.e_ident, elf->e_ident,
sizeof(elf->e_ident));
dbg_eh.e_machine = elf->e_machine;
dbg_eh.e_version = elf->e_version;
dbg_eh.e_entry = 0;
dbg_eh.e_phoff = 0;
dbg_eh.e_shoff = sizeof(Elf_Ehdr);
dbg_eh.e_flags = elf->e_flags;
dbg_eh.e_ehsize = sizeof(Elf_Ehdr);
dbg_eh.e_phentsize = 0;
dbg_eh.e_phnum = 0;
dbg_eh.e_shentsize = sizeof(Elf_Shdr);
dbg_eh.e_shnum = 2;
dbg_eh.e_shstrndx = 0; /* ??? */
/*
* XXX, pass debug info size in e_entry.
*/
dbg_eh.e_entry = ROUNDUP(dbg_hdr_size +
shtbl[sh_symidx].sh_size +
shtbl[sh_stridx].sh_size,
DEBUG_INFO_ALIGN);
if (vmem_sub(VMEM_COPY, (void*)&dbg_eh,
max_addr,
sizeof(Elf_Ehdr),
&byte_count) != 0) {
goto error_cleanup;
}
dbg_sh[0].sh_type = shtbl[sh_symidx].sh_type;
dbg_sh[0].sh_offset = dbg_hdr_size;
dbg_sh[0].sh_size = shtbl[sh_symidx].sh_size;
dbg_sh[0].sh_addralign = shtbl[sh_symidx].sh_addralign;
dbg_sh[1].sh_type = shtbl[sh_stridx].sh_type;
dbg_sh[1].sh_offset = dbg_hdr_size + shtbl[sh_symidx].sh_size;
dbg_sh[1].sh_size = shtbl[sh_stridx].sh_size;
dbg_sh[1].sh_addralign = shtbl[sh_stridx].sh_addralign;
if (vmem_sub(VMEM_COPY, (void*)dbg_sh,
max_addr + sizeof(Elf_Ehdr),
sizeof(Elf_Shdr) * 2,
&byte_count) != 0) {
goto error_cleanup;
}
if (lseek(fd, shtbl[sh_symidx].sh_offset, SEEK_SET) == -1) {
debug_printf(TEXT("seek for debug symbol error\n"));
msg_printf(MSG_ERROR, whoami,
TEXT("seek for segment error.\n"));
goto error_cleanup;
}
if (vmem_sub(VMEM_LOAD, (void*)fd,
max_addr + dbg_hdr_size,
shtbl[sh_symidx].sh_size,
&byte_count) != 0) {
goto error_cleanup;
}
if (lseek(fd, shtbl[sh_stridx].sh_offset, SEEK_SET) == -1) {
debug_printf(TEXT("seek for string table error\n"));
msg_printf(MSG_ERROR, whoami,
TEXT("seek for segment error.\n"));
goto error_cleanup;
}
if (vmem_sub(VMEM_LOAD, (void*)fd,
max_addr + dbg_hdr_size + shtbl[sh_symidx].sh_size,
shtbl[sh_stridx].sh_size,
&byte_count) != 0) {
goto error_cleanup;
}
} else {
/*
* make space for debugging information
*/
int dbg_info_size = ROUNDUP(dbg_hdr_size +
shtbl[sh_symidx].sh_size +
shtbl[sh_stridx].sh_size,
DEBUG_INFO_ALIGN);
debug_printf(TEXT("%x bytes debug information\n"),
dbg_info_size);
max_addr += dbg_info_size;
total_bytes += dbg_info_size;
}
}
#endif /* LOAD_DEBUG_INFO */
if (phtbl) dealloc(phtbl, sizeof(*phtbl) * elf->e_phnum);
if (shtbl) dealloc(shtbl, sizeof(*shtbl) * elf->e_shnum);
if (start) *start = min_addr;
if (end) *end = max_addr;
if (entry) *entry = (void *)elf->e_entry;
return (0);
error_cleanup:
if (phtbl) dealloc(phtbl, sizeof(*phtbl) * elf->e_phnum);
if (shtbl) dealloc(shtbl, sizeof(*shtbl) * elf->e_shnum);
return (-1);
}
