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NetBSD/sys/lib/libsa/loadfile_elf32.c

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/* $NetBSD: loadfile_elf32.c,v 1.29 2011/02/17 21:15:31 christos Exp $ */
/*-
* Copyright (c) 1997, 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center and by Christos Zoulas.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/* If not included by exec_elf64.c, ELFSIZE won't be defined. */
#ifndef ELFSIZE
#define ELFSIZE 32
#endif
#ifdef _STANDALONE
#include <lib/libsa/stand.h>
#include <lib/libkern/libkern.h>
#else
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <err.h>
#endif
#include <sys/param.h>
#include <sys/exec.h>
#include "loadfile.h"
#if ((ELFSIZE == 32) && defined(BOOT_ELF32)) || \
((ELFSIZE == 64) && defined(BOOT_ELF64))
#define ELFROUND (ELFSIZE / 8)
#ifndef _STANDALONE
#include "byteorder.h"
/*
* Byte swapping may be necessary in the non-_STANDLONE case because
* we may be built with a host compiler.
*/
#define E16(f) \
f = (bo == ELFDATA2LSB) ? sa_htole16(f) : sa_htobe16(f)
#define E32(f) \
f = (bo == ELFDATA2LSB) ? sa_htole32(f) : sa_htobe32(f)
#define E64(f) \
f = (bo == ELFDATA2LSB) ? sa_htole64(f) : sa_htobe64(f)
#define I16(f) \
f = (bo == ELFDATA2LSB) ? sa_le16toh(f) : sa_be16toh(f)
#define I32(f) \
f = (bo == ELFDATA2LSB) ? sa_le32toh(f) : sa_be32toh(f)
#define I64(f) \
f = (bo == ELFDATA2LSB) ? sa_le64toh(f) : sa_be64toh(f)
static void
internalize_ehdr(Elf_Byte bo, Elf_Ehdr *ehdr)
{
#if ELFSIZE == 32
I16(ehdr->e_type);
I16(ehdr->e_machine);
I32(ehdr->e_version);
I32(ehdr->e_entry);
I32(ehdr->e_phoff);
I32(ehdr->e_shoff);
I32(ehdr->e_flags);
I16(ehdr->e_ehsize);
I16(ehdr->e_phentsize);
I16(ehdr->e_phnum);
I16(ehdr->e_shentsize);
I16(ehdr->e_shnum);
I16(ehdr->e_shstrndx);
#elif ELFSIZE == 64
I16(ehdr->e_type);
I16(ehdr->e_machine);
I32(ehdr->e_version);
I64(ehdr->e_entry);
I64(ehdr->e_phoff);
I64(ehdr->e_shoff);
I32(ehdr->e_flags);
I16(ehdr->e_ehsize);
I16(ehdr->e_phentsize);
I16(ehdr->e_phnum);
I16(ehdr->e_shentsize);
I16(ehdr->e_shnum);
I16(ehdr->e_shstrndx);
#else
#error ELFSIZE is not 32 or 64
#endif
}
static void
externalize_ehdr(Elf_Byte bo, Elf_Ehdr *ehdr)
{
#if ELFSIZE == 32
E16(ehdr->e_type);
E16(ehdr->e_machine);
E32(ehdr->e_version);
E32(ehdr->e_entry);
E32(ehdr->e_phoff);
E32(ehdr->e_shoff);
E32(ehdr->e_flags);
E16(ehdr->e_ehsize);
E16(ehdr->e_phentsize);
E16(ehdr->e_phnum);
E16(ehdr->e_shentsize);
E16(ehdr->e_shnum);
E16(ehdr->e_shstrndx);
#elif ELFSIZE == 64
E16(ehdr->e_type);
E16(ehdr->e_machine);
E32(ehdr->e_version);
E64(ehdr->e_entry);
E64(ehdr->e_phoff);
E64(ehdr->e_shoff);
E32(ehdr->e_flags);
E16(ehdr->e_ehsize);
E16(ehdr->e_phentsize);
E16(ehdr->e_phnum);
E16(ehdr->e_shentsize);
E16(ehdr->e_shnum);
E16(ehdr->e_shstrndx);
#else
#error ELFSIZE is not 32 or 64
#endif
}
static void
internalize_phdr(Elf_Byte bo, Elf_Phdr *phdr)
{
#if ELFSIZE == 32
I32(phdr->p_type);
I32(phdr->p_offset);
I32(phdr->p_vaddr);
I32(phdr->p_paddr);
I32(phdr->p_filesz);
I32(phdr->p_memsz);
I32(phdr->p_flags);
I32(phdr->p_align);
#elif ELFSIZE == 64
I32(phdr->p_type);
I32(phdr->p_offset);
I64(phdr->p_vaddr);
I64(phdr->p_paddr);
I64(phdr->p_filesz);
I64(phdr->p_memsz);
I64(phdr->p_flags);
I64(phdr->p_align);
#else
#error ELFSIZE is not 32 or 64
#endif
}
static void
internalize_shdr(Elf_Byte bo, Elf_Shdr *shdr)
{
#if ELFSIZE == 32
I32(shdr->sh_name);
I32(shdr->sh_type);
I32(shdr->sh_flags);
I32(shdr->sh_addr);
I32(shdr->sh_offset);
I32(shdr->sh_size);
I32(shdr->sh_link);
I32(shdr->sh_info);
I32(shdr->sh_addralign);
I32(shdr->sh_entsize);
#elif ELFSIZE == 64
I32(shdr->sh_name);
I32(shdr->sh_type);
I64(shdr->sh_flags);
I64(shdr->sh_addr);
I64(shdr->sh_offset);
I64(shdr->sh_size);
I32(shdr->sh_link);
I32(shdr->sh_info);
I64(shdr->sh_addralign);
I64(shdr->sh_entsize);
#else
#error ELFSIZE is not 32 or 64
#endif
}
static void
externalize_shdr(Elf_Byte bo, Elf_Shdr *shdr)
{
#if ELFSIZE == 32
E32(shdr->sh_name);
E32(shdr->sh_type);
E32(shdr->sh_flags);
E32(shdr->sh_addr);
E32(shdr->sh_offset);
E32(shdr->sh_size);
E32(shdr->sh_link);
E32(shdr->sh_info);
E32(shdr->sh_addralign);
E32(shdr->sh_entsize);
#elif ELFSIZE == 64
E32(shdr->sh_name);
E32(shdr->sh_type);
E64(shdr->sh_flags);
E64(shdr->sh_addr);
E64(shdr->sh_offset);
E64(shdr->sh_size);
E32(shdr->sh_link);
E32(shdr->sh_info);
E64(shdr->sh_addralign);
E64(shdr->sh_entsize);
#else
#error ELFSIZE is not 32 or 64
#endif
}
#else /* _STANDALONE */
/*
* Byte swapping is never necessary in the _STANDALONE case because
* we are being built with the target compiler.
*/
#define internalize_ehdr(bo, ehdr) /* nothing */
#define externalize_ehdr(bo, ehdr) /* nothing */
#define internalize_phdr(bo, phdr) /* nothing */
#define internalize_shdr(bo, shdr) /* nothing */
#define externalize_shdr(bo, shdr) /* nothing */
#endif /* _STANDALONE */
int
ELFNAMEEND(loadfile)(int fd, Elf_Ehdr *elf, u_long *marks, int flags)
{
Elf_Shdr *shp;
Elf_Phdr *phdr;
int i, j;
ssize_t sz;
int first;
Elf_Addr shpp;
Elf_Addr minp = ~0, maxp = 0, pos = 0, elfp = 0;
u_long offset = marks[MARK_START];
ssize_t nr;
struct __packed {
Elf_Nhdr nh;
uint8_t name[ELF_NOTE_NETBSD_NAMESZ + 1];
uint8_t desc[ELF_NOTE_NETBSD_DESCSZ];
} note;
char *shstr = NULL;
int boot_load_ctf = 1;
/* some ports dont use the offset */
(void)&offset;
internalize_ehdr(elf->e_ident[EI_DATA], elf);
sz = elf->e_phnum * sizeof(Elf_Phdr);
phdr = ALLOC(sz);
if (lseek(fd, elf->e_phoff, SEEK_SET) == -1) {
WARN(("lseek phdr"));
goto freephdr;
}
nr = read(fd, phdr, sz);
if (nr == -1) {
WARN(("read program headers"));
goto freephdr;
}
if (nr != sz) {
errno = EIO;
WARN(("read program headers"));
goto freephdr;
}
for (first = 1, i = 0; i < elf->e_phnum; i++) {
internalize_phdr(elf->e_ident[EI_DATA], &phdr[i]);
#ifndef MD_LOADSEG /* Allow processor ABI specific segment loads */
#define MD_LOADSEG(a) /*CONSTCOND*/0
#endif
if (MD_LOADSEG(&phdr[i]))
goto loadseg;
if (phdr[i].p_type != PT_LOAD ||
(phdr[i].p_flags & (PF_W|PF_X)) == 0)
continue;
#define IS_TEXT(p) (p.p_flags & PF_X)
#define IS_DATA(p) (p.p_flags & PF_W)
#define IS_BSS(p) (p.p_filesz < p.p_memsz)
/*
* XXX: Assume first address is lowest
*/
if ((IS_TEXT(phdr[i]) && (flags & LOAD_TEXT)) ||
(IS_DATA(phdr[i]) && (flags & LOAD_DATA))) {
loadseg:
if (marks[MARK_DATA] == 0 && IS_DATA(phdr[i]))
marks[MARK_DATA] = LOADADDR(phdr[i].p_vaddr);
/* Read in segment. */
PROGRESS(("%s%lu", first ? "" : "+",
(u_long)phdr[i].p_filesz));
if (lseek(fd, phdr[i].p_offset, SEEK_SET) == -1) {
WARN(("lseek text"));
goto freephdr;
}
nr = READ(fd, phdr[i].p_vaddr, phdr[i].p_filesz);
if (nr == -1) {
WARN(("read text error"));
goto freephdr;
}
if (nr != (ssize_t)phdr[i].p_filesz) {
errno = EIO;
WARN(("read text"));
goto freephdr;
}
first = 0;
}
if ((IS_TEXT(phdr[i]) && (flags & (LOAD_TEXT|COUNT_TEXT))) ||
(IS_DATA(phdr[i]) && (flags & (LOAD_DATA|COUNT_TEXT)))) {
pos = phdr[i].p_vaddr;
if (minp > pos)
minp = pos;
pos += phdr[i].p_filesz;
if (maxp < pos)
maxp = pos;
}
/* Zero out bss. */
if (IS_BSS(phdr[i]) && (flags & LOAD_BSS)) {
PROGRESS(("+%lu",
(u_long)(phdr[i].p_memsz - phdr[i].p_filesz)));
BZERO((phdr[i].p_vaddr + phdr[i].p_filesz),
phdr[i].p_memsz - phdr[i].p_filesz);
}
if (IS_BSS(phdr[i]) && (flags & (LOAD_BSS|COUNT_BSS))) {
pos += phdr[i].p_memsz - phdr[i].p_filesz;
if (maxp < pos)
maxp = pos;
}
}
DEALLOC(phdr, sz);
/*
* Copy the ELF and section headers.
*/
maxp = roundup(maxp, ELFROUND);
if (flags & (LOAD_HDR|COUNT_HDR)) {
elfp = maxp;
maxp += sizeof(Elf_Ehdr);
}
if (flags & (LOAD_SYM|COUNT_SYM)) {
if (lseek(fd, elf->e_shoff, SEEK_SET) == -1) {
WARN(("lseek section headers"));
return 1;
}
sz = elf->e_shnum * sizeof(Elf_Shdr);
shp = ALLOC(sz);
nr = read(fd, shp, sz);
if (nr == -1) {
WARN(("read section headers"));
goto freeshp;
}
if (nr != sz) {
errno = EIO;
WARN(("read section headers"));
goto freeshp;
}
shpp = maxp;
maxp += roundup(sz, ELFROUND);
#ifndef _STANDALONE
/* Internalize the section headers. */
for (i = 0; i < elf->e_shnum; i++)
internalize_shdr(elf->e_ident[EI_DATA], &shp[i]);
#endif /* ! _STANDALONE */
/*
* First load the section names section.
*/
if (boot_load_ctf && (elf->e_shstrndx != 0)) {
if (flags & LOAD_SYM) {
if (lseek(fd, shp[elf->e_shstrndx].sh_offset,
SEEK_SET) == -1) {
WARN(("lseek symbols"));
goto freeshp;
}
nr = READ(fd, maxp,
shp[elf->e_shstrndx].sh_size);
if (nr == -1) {
WARN(("read symbols"));
goto freeshp;
}
if (nr !=
(ssize_t)shp[elf->e_shstrndx].sh_size) {
errno = EIO;
WARN(("read symbols"));
goto freeshp;
}
shstr = ALLOC(shp[elf->e_shstrndx].sh_size);
if (lseek(fd, shp[elf->e_shstrndx].sh_offset,
SEEK_SET) == -1) {
WARN(("lseek symbols"));
goto freeshp;
}
nr = read(fd, shstr,
shp[elf->e_shstrndx].sh_size);
if (nr == -1) {
WARN(("read symbols"));
goto freeshp;
}
}
shp[elf->e_shstrndx].sh_offset = maxp - elfp;
maxp += roundup(shp[elf->e_shstrndx].sh_size, ELFROUND);
}
/*
* Now load the symbol sections themselves. Make sure
* the sections are aligned. Don't bother with any
* string table that isn't referenced by a symbol
* table.
*/
for (first = 1, i = 0; i < elf->e_shnum; i++) {
if (i == elf->e_shstrndx) {
/* already loaded this section */
continue;
}
switch (shp[i].sh_type) {
case SHT_PROGBITS:
if (boot_load_ctf && shstr) {
/* got a CTF section? */
if (strncmp(".SUNW_ctf",
&shstr[shp[i].sh_name],
10) == 0) {
goto havesym;
}
}
/* Not loading this, so zero out the offset. */
shp[i].sh_offset = 0;
break;
case SHT_STRTAB:
for (j = 0; j < elf->e_shnum; j++)
if (shp[j].sh_type == SHT_SYMTAB &&
shp[j].sh_link == (unsigned int)i)
goto havesym;
/* FALLTHROUGH */
default:
/* Not loading this, so zero out the offset. */
shp[i].sh_offset = 0;
break;
havesym:
case SHT_SYMTAB:
if (flags & LOAD_SYM) {
PROGRESS(("%s%ld", first ? " [" : "+",
(u_long)shp[i].sh_size));
if (lseek(fd, shp[i].sh_offset,
SEEK_SET) == -1) {
WARN(("lseek symbols"));
goto freeshp;
}
nr = READ(fd, maxp, shp[i].sh_size);
if (nr == -1) {
WARN(("read symbols"));
goto freeshp;
}
if (nr != (ssize_t)shp[i].sh_size) {
errno = EIO;
WARN(("read symbols"));
goto freeshp;
}
}
shp[i].sh_offset = maxp - elfp;
maxp += roundup(shp[i].sh_size, ELFROUND);
first = 0;
break;
case SHT_NOTE:
if ((flags & LOAD_NOTE) == 0)
break;
if (shp[i].sh_size < sizeof(note)) {
shp[i].sh_offset = 0;
break;
}
if (lseek(fd, shp[i].sh_offset, SEEK_SET)
== -1) {
WARN(("lseek note"));
goto freeshp;
}
nr = read(fd, &note, sizeof(note));
if (nr == -1) {
WARN(("read note"));
goto freeshp;
}
if (note.nh.n_namesz ==
ELF_NOTE_NETBSD_NAMESZ &&
note.nh.n_descsz ==
ELF_NOTE_NETBSD_DESCSZ &&
note.nh.n_type ==
ELF_NOTE_TYPE_NETBSD_TAG &&
memcmp(note.name, ELF_NOTE_NETBSD_NAME,
sizeof(note.name)) == 0) {
memcpy(&netbsd_version, &note.desc,
sizeof(netbsd_version));
}
shp[i].sh_offset = 0;
break;
}
}
if (flags & LOAD_SYM) {
#ifndef _STANDALONE
/* Externalize the section headers. */
for (i = 0; i < elf->e_shnum; i++)
externalize_shdr(elf->e_ident[EI_DATA],
&shp[i]);
#endif /* ! _STANDALONE */
BCOPY(shp, shpp, sz);
if (first == 0)
PROGRESS(("]"));
}
DEALLOC(shp, sz);
}
if (shstr) {
DEALLOC(shstr, shp[elf->e_shstrndx].sh_size);
}
/*
* Frob the copied ELF header to give information relative
* to elfp.
*/
if (flags & LOAD_HDR) {
elf->e_phoff = 0;
elf->e_shoff = sizeof(Elf_Ehdr);
elf->e_phentsize = 0;
elf->e_phnum = 0;
externalize_ehdr(elf->e_ident[EI_DATA], elf);
BCOPY(elf, elfp, sizeof(*elf));
internalize_ehdr(elf->e_ident[EI_DATA], elf);
}
marks[MARK_START] = LOADADDR(minp);
marks[MARK_ENTRY] = LOADADDR(elf->e_entry);
/*
* Since there can be more than one symbol section in the code
* and we need to find strtab too in order to do anything
* useful with the symbols, we just pass the whole elf
* header back and we let the kernel debugger find the
* location and number of symbols by itself.
*/
marks[MARK_NSYM] = 1; /* XXX: Kernel needs >= 0 */
marks[MARK_SYM] = LOADADDR(elfp);
marks[MARK_END] = LOADADDR(maxp);
return 0;
freephdr:
DEALLOC(phdr, sz);
return 1;
freeshp:
DEALLOC(shp, sz);
return 1;
}
#ifdef TEST
#include <stdlib.h>
#include <fcntl.h>
#include <err.h>
#include <stdio.h>
u_int32_t netbsd_version;
int
main(int argc, char *argv[])
{
int fd;
u_long marks[MARK_MAX];
Elf_Ehdr elf;
if (argc != 2) {
(void)fprintf(stderr, "Usage: %s <file>\n", getprogname());
return 1;
}
if ((fd = open(argv[1], O_RDONLY)) == -1)
err(1, "Can't open `%s'", argv[1]);
if (read(fd, &elf, sizeof(elf)) != sizeof(elf))
err(1, "Can't read `%s'", argv[1]);
memset(marks, 0, sizeof(marks));
marks[MARK_START] = (u_long)malloc(2LL * 1024 * 2024 * 1024);
ELFNAMEEND(loadfile)(fd, &elf, marks, LOAD_ALL);
printf("%d\n", netbsd_version);
return 0;
}
#endif
#endif /* (ELFSIZE == 32 && BOOT_ELF32) || (ELFSIZE == 64 && BOOT_ELF64) */
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