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qemu/loader.c

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/*
* QEMU Executable loader
*
* Copyright (c) 2006 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu-common.h"
#include "disas.h"
#include "sysemu.h"
#include "uboot_image.h"
/* return the size or -1 if error */
int get_image_size(const char *filename)
{
int fd, size;
fd = open(filename, O_RDONLY | O_BINARY);
if (fd < 0)
return -1;
size = lseek(fd, 0, SEEK_END);
close(fd);
return size;
}
/* return the size or -1 if error */
/* deprecated, because caller does not specify buffer size! */
int load_image(const char *filename, uint8_t *addr)
{
int fd, size;
fd = open(filename, O_RDONLY | O_BINARY);
if (fd < 0)
return -1;
size = lseek(fd, 0, SEEK_END);
lseek(fd, 0, SEEK_SET);
if (read(fd, addr, size) != size) {
close(fd);
return -1;
}
close(fd);
return size;
}
/* return the amount read, just like fread. 0 may mean error or eof */
int fread_targphys(target_phys_addr_t dst_addr, size_t nbytes, FILE *f)
{
uint8_t buf[4096];
target_phys_addr_t dst_begin = dst_addr;
size_t want, did;
while (nbytes) {
want = nbytes > sizeof(buf) ? sizeof(buf) : nbytes;
did = fread(buf, 1, want, f);
if (did != want) break;
cpu_physical_memory_write_rom(dst_addr, buf, did);
dst_addr += did;
nbytes -= did;
}
return dst_addr - dst_begin;
}
/* returns 0 on error, 1 if ok */
int fread_targphys_ok(target_phys_addr_t dst_addr, size_t nbytes, FILE *f)
{
return fread_targphys(dst_addr, nbytes, f) == nbytes;
}
/* read()-like version */
int read_targphys(int fd, target_phys_addr_t dst_addr, size_t nbytes)
{
uint8_t buf[4096];
target_phys_addr_t dst_begin = dst_addr;
size_t want, did;
while (nbytes) {
want = nbytes > sizeof(buf) ? sizeof(buf) : nbytes;
did = read(fd, buf, want);
if (did != want) break;
cpu_physical_memory_write_rom(dst_addr, buf, did);
dst_addr += did;
nbytes -= did;
}
return dst_addr - dst_begin;
}
/* return the size or -1 if error */
int load_image_targphys(const char *filename,
target_phys_addr_t addr, int max_sz)
{
FILE *f;
size_t got;
f = fopen(filename, "rb");
if (!f) return -1;
got = fread_targphys(addr, max_sz, f);
if (ferror(f)) { fclose(f); return -1; }
fclose(f);
return got;
}
void pstrcpy_targphys(target_phys_addr_t dest, int buf_size,
const char *source)
{
static const uint8_t nul_byte = 0;
const char *nulp;
if (buf_size <= 0) return;
nulp = memchr(source, 0, buf_size);
if (nulp) {
cpu_physical_memory_write_rom(dest, (uint8_t *)source,
(nulp - source) + 1);
} else {
cpu_physical_memory_write_rom(dest, (uint8_t *)source, buf_size - 1);
cpu_physical_memory_write_rom(dest, &nul_byte, 1);
}
}
/* A.OUT loader */
struct exec
{
uint32_t a_info; /* Use macros N_MAGIC, etc for access */
uint32_t a_text; /* length of text, in bytes */
uint32_t a_data; /* length of data, in bytes */
uint32_t a_bss; /* length of uninitialized data area, in bytes */
uint32_t a_syms; /* length of symbol table data in file, in bytes */
uint32_t a_entry; /* start address */
uint32_t a_trsize; /* length of relocation info for text, in bytes */
uint32_t a_drsize; /* length of relocation info for data, in bytes */
};
#ifdef BSWAP_NEEDED
static void bswap_ahdr(struct exec *e)
{
bswap32s(&e->a_info);
bswap32s(&e->a_text);
bswap32s(&e->a_data);
bswap32s(&e->a_bss);
bswap32s(&e->a_syms);
bswap32s(&e->a_entry);
bswap32s(&e->a_trsize);
bswap32s(&e->a_drsize);
}
#else
#define bswap_ahdr(x) do { } while (0)
#endif
#define N_MAGIC(exec) ((exec).a_info & 0xffff)
#define OMAGIC 0407
#define NMAGIC 0410
#define ZMAGIC 0413
#define QMAGIC 0314
#define _N_HDROFF(x) (1024 - sizeof (struct exec))
#define N_TXTOFF(x) \
(N_MAGIC(x) == ZMAGIC ? _N_HDROFF((x)) + sizeof (struct exec) : \
(N_MAGIC(x) == QMAGIC ? 0 : sizeof (struct exec)))
#define N_TXTADDR(x) (N_MAGIC(x) == QMAGIC ? TARGET_PAGE_SIZE : 0)
#define N_DATOFF(x) (N_TXTOFF(x) + (x).a_text)
#define _N_SEGMENT_ROUND(x) (((x) + TARGET_PAGE_SIZE - 1) & ~(TARGET_PAGE_SIZE - 1))
#define _N_TXTENDADDR(x) (N_TXTADDR(x)+(x).a_text)
#define N_DATADDR(x) \
(N_MAGIC(x)==OMAGIC? (_N_TXTENDADDR(x)) \
: (_N_SEGMENT_ROUND (_N_TXTENDADDR(x))))
int load_aout(const char *filename, target_phys_addr_t addr, int max_sz)
{
int fd, size, ret;
struct exec e;
uint32_t magic;
fd = open(filename, O_RDONLY | O_BINARY);
if (fd < 0)
return -1;
size = read(fd, &e, sizeof(e));
if (size < 0)
goto fail;
bswap_ahdr(&e);
magic = N_MAGIC(e);
switch (magic) {
case ZMAGIC:
case QMAGIC:
case OMAGIC:
if (e.a_text + e.a_data > max_sz)
goto fail;
lseek(fd, N_TXTOFF(e), SEEK_SET);
size = read_targphys(fd, addr, e.a_text + e.a_data);
if (size < 0)
goto fail;
break;
case NMAGIC:
if (N_DATADDR(e) + e.a_data > max_sz)
goto fail;
lseek(fd, N_TXTOFF(e), SEEK_SET);
size = read_targphys(fd, addr, e.a_text);
if (size < 0)
goto fail;
ret = read_targphys(fd, addr + N_DATADDR(e), e.a_data);
if (ret < 0)
goto fail;
size += ret;
break;
default:
goto fail;
}
close(fd);
return size;
fail:
close(fd);
return -1;
}
/* ELF loader */
static void *load_at(int fd, int offset, int size)
{
void *ptr;
if (lseek(fd, offset, SEEK_SET) < 0)
return NULL;
ptr = qemu_malloc(size);
if (!ptr)
return NULL;
if (read(fd, ptr, size) != size) {
qemu_free(ptr);
return NULL;
}
return ptr;
}
#define ELF_CLASS ELFCLASS32
#include "elf.h"
#define SZ 32
#define elf_word uint32_t
#define elf_sword int32_t
#define bswapSZs bswap32s
#include "elf_ops.h"
#undef elfhdr
#undef elf_phdr
#undef elf_shdr
#undef elf_sym
#undef elf_note
#undef elf_word
#undef elf_sword
#undef bswapSZs
#undef SZ
#define elfhdr elf64_hdr
#define elf_phdr elf64_phdr
#define elf_note elf64_note
#define elf_shdr elf64_shdr
#define elf_sym elf64_sym
#define elf_word uint64_t
#define elf_sword int64_t
#define bswapSZs bswap64s
#define SZ 64
#include "elf_ops.h"
/* return < 0 if error, otherwise the number of bytes loaded in memory */
int load_elf(const char *filename, int64_t virt_to_phys_addend,
uint64_t *pentry, uint64_t *lowaddr, uint64_t *highaddr)
{
int fd, data_order, host_data_order, must_swab, ret;
uint8_t e_ident[EI_NIDENT];
fd = open(filename, O_RDONLY | O_BINARY);
if (fd < 0) {
perror(filename);
return -1;
}
if (read(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident))
goto fail;
if (e_ident[0] != ELFMAG0 ||
e_ident[1] != ELFMAG1 ||
e_ident[2] != ELFMAG2 ||
e_ident[3] != ELFMAG3)
goto fail;
#ifdef WORDS_BIGENDIAN
data_order = ELFDATA2MSB;
#else
data_order = ELFDATA2LSB;
#endif
must_swab = data_order != e_ident[EI_DATA];
#ifdef TARGET_WORDS_BIGENDIAN
host_data_order = ELFDATA2MSB;
#else
host_data_order = ELFDATA2LSB;
#endif
if (host_data_order != e_ident[EI_DATA])
return -1;
lseek(fd, 0, SEEK_SET);
if (e_ident[EI_CLASS] == ELFCLASS64) {
ret = load_elf64(fd, virt_to_phys_addend, must_swab, pentry,
lowaddr, highaddr);
} else {
ret = load_elf32(fd, virt_to_phys_addend, must_swab, pentry,
lowaddr, highaddr);
}
close(fd);
return ret;
fail:
close(fd);
return -1;
}
static void bswap_uboot_header(uboot_image_header_t *hdr)
{
#ifndef WORDS_BIGENDIAN
bswap32s(&hdr->ih_magic);
bswap32s(&hdr->ih_hcrc);
bswap32s(&hdr->ih_time);
bswap32s(&hdr->ih_size);
bswap32s(&hdr->ih_load);
bswap32s(&hdr->ih_ep);
bswap32s(&hdr->ih_dcrc);
#endif
}
/* Load a U-Boot image. */
int load_uboot(const char *filename, target_ulong *ep, int *is_linux)
{
int fd;
int size;
uboot_image_header_t h;
uboot_image_header_t *hdr = &h;
uint8_t *data = NULL;
fd = open(filename, O_RDONLY | O_BINARY);
if (fd < 0)
return -1;
size = read(fd, hdr, sizeof(uboot_image_header_t));
if (size < 0)
goto fail;
bswap_uboot_header(hdr);
if (hdr->ih_magic != IH_MAGIC)
goto fail;
/* TODO: Implement Multi-File images. */
if (hdr->ih_type == IH_TYPE_MULTI) {
fprintf(stderr, "Unable to load multi-file u-boot images\n");
goto fail;
}
/* TODO: Implement compressed images. */
if (hdr->ih_comp != IH_COMP_NONE) {
fprintf(stderr, "Unable to load compressed u-boot images\n");
goto fail;
}
/* TODO: Check CPU type. */
if (is_linux) {
if (hdr->ih_type == IH_TYPE_KERNEL && hdr->ih_os == IH_OS_LINUX)
*is_linux = 1;
else
*is_linux = 0;
}
*ep = hdr->ih_ep;
data = qemu_malloc(hdr->ih_size);
if (!data)
goto fail;
if (read(fd, data, hdr->ih_size) != hdr->ih_size) {
fprintf(stderr, "Error reading file\n");
goto fail;
}
cpu_physical_memory_write_rom(hdr->ih_load, data, hdr->ih_size);
return hdr->ih_size;
fail:
if (data)
qemu_free(data);
close(fd);
return -1;
}
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