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generic ELF loader 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1831 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2006-04-23 17:12:42 +00:00
parent ce2f4b3cb9
commit 5fe141fd30
5 changed files with 439 additions and 36 deletions
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7
Makefile.target
View File

@ -270,7 +270,7 @@ ifeq ($(ARCH),alpha)
endif
# must use static linking to avoid leaving stuff in virtual address space
VL_OBJS=vl.o osdep.o block.o readline.o monitor.o pci.o console.o
VL_OBJS=vl.o osdep.o block.o readline.o monitor.o pci.o console.o loader.o
VL_OBJS+=block-cow.o block-qcow.o aes.o block-vmdk.o block-cloop.o block-dmg.o block-bochs.o block-vpc.o block-vvfat.o
ifdef CONFIG_WIN32
VL_OBJS+=tap-win32.o
@ -332,9 +332,8 @@ ifeq ($(TARGET_ARCH), sparc64)
VL_OBJS+= sun4u.o ide.o pckbd.o ps2.o vga.o
VL_OBJS+= fdc.o mc146818rtc.o serial.o m48t59.o
VL_OBJS+= cirrus_vga.o parallel.o
VL_OBJS+= magic-load.o
else
VL_OBJS+= sun4m.o tcx.o lance.o iommu.o m48t59.o magic-load.o slavio_intctl.o
VL_OBJS+= sun4m.o tcx.o lance.o iommu.o m48t59.o slavio_intctl.o
VL_OBJS+= slavio_timer.o slavio_serial.o slavio_misc.o fdc.o esp.o
endif
endif
@ -459,6 +458,8 @@ op.o: op.c op_template.c op_mem.c
op_helper.o: op_helper_mem.c
endif
loader.o: loader.c elf_ops.h
%.o: %.c
$(CC) $(CFLAGS) $(DEFINES) -c -o $@ $<

197
elf_ops.h Normal file
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@ -0,0 +1,197 @@
static void glue(bswap_ehdr, SZ)(struct elfhdr *ehdr)
{
bswap16s(&ehdr->e_type); /* Object file type */
bswap16s(&ehdr->e_machine); /* Architecture */
bswap32s(&ehdr->e_version); /* Object file version */
bswapSZs(&ehdr->e_entry); /* Entry point virtual address */
bswapSZs(&ehdr->e_phoff); /* Program header table file offset */
bswapSZs(&ehdr->e_shoff); /* Section header table file offset */
bswap32s(&ehdr->e_flags); /* Processor-specific flags */
bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */
bswap16s(&ehdr->e_phentsize); /* Program header table entry size */
bswap16s(&ehdr->e_phnum); /* Program header table entry count */
bswap16s(&ehdr->e_shentsize); /* Section header table entry size */
bswap16s(&ehdr->e_shnum); /* Section header table entry count */
bswap16s(&ehdr->e_shstrndx); /* Section header string table index */
}
static void glue(bswap_phdr, SZ)(struct elf_phdr *phdr)
{
bswap32s(&phdr->p_type); /* Segment type */
bswapSZs(&phdr->p_offset); /* Segment file offset */
bswapSZs(&phdr->p_vaddr); /* Segment virtual address */
bswapSZs(&phdr->p_paddr); /* Segment physical address */
bswapSZs(&phdr->p_filesz); /* Segment size in file */
bswapSZs(&phdr->p_memsz); /* Segment size in memory */
bswap32s(&phdr->p_flags); /* Segment flags */
bswapSZs(&phdr->p_align); /* Segment alignment */
}
static void glue(bswap_shdr, SZ)(struct elf_shdr *shdr)
{
bswap32s(&shdr->sh_name);
bswap32s(&shdr->sh_type);
bswapSZs(&shdr->sh_flags);
bswapSZs(&shdr->sh_addr);
bswapSZs(&shdr->sh_offset);
bswapSZs(&shdr->sh_size);
bswap32s(&shdr->sh_link);
bswap32s(&shdr->sh_info);
bswapSZs(&shdr->sh_addralign);
bswapSZs(&shdr->sh_entsize);
}
static void glue(bswap_sym, SZ)(struct elf_sym *sym)
{
bswap32s(&sym->st_name);
bswapSZs(&sym->st_value);
bswapSZs(&sym->st_size);
bswap16s(&sym->st_shndx);
}
static struct elf_shdr *glue(find_section, SZ)(struct elf_shdr *shdr_table,
int n, int type)
{
int i;
for(i=0;i<n;i++) {
if (shdr_table[i].sh_type == type)
return shdr_table + i;
}
return NULL;
}
static int glue(load_symbols, SZ)(struct elfhdr *ehdr, int fd, int must_swab)
{
struct elf_shdr *symtab, *strtab, *shdr_table = NULL;
struct elf_sym *syms = NULL;
#if (SZ == 64)
struct elf32_sym *syms32 = NULL;
#endif
struct syminfo *s;
int nsyms, i;
char *str = NULL;
shdr_table = load_at(fd, ehdr->e_shoff,
sizeof(struct elf_shdr) * ehdr->e_shnum);
if (!shdr_table)
return -1;
if (must_swab) {
for (i = 0; i < ehdr->e_shnum; i++) {
glue(bswap_shdr, SZ)(shdr_table + i);
}
}
symtab = glue(find_section, SZ)(shdr_table, ehdr->e_shnum, SHT_SYMTAB);
if (!symtab)
goto fail;
syms = load_at(fd, symtab->sh_offset, symtab->sh_size);
if (!syms)
goto fail;
nsyms = symtab->sh_size / sizeof(struct elf_sym);
#if (SZ == 64)
syms32 = qemu_mallocz(nsyms * sizeof(struct elf32_sym));
#endif
for (i = 0; i < nsyms; i++) {
if (must_swab)
glue(bswap_sym, SZ)(&syms[i]);
#if (SZ == 64)
syms32[i].st_name = syms[i].st_name;
syms32[i].st_info = syms[i].st_info;
syms32[i].st_other = syms[i].st_other;
syms32[i].st_shndx = syms[i].st_shndx;
syms32[i].st_value = syms[i].st_value & 0xffffffff;
syms32[i].st_size = syms[i].st_size & 0xffffffff;
#endif
}
/* String table */
if (symtab->sh_link >= ehdr->e_shnum)
goto fail;
strtab = &shdr_table[symtab->sh_link];
str = load_at(fd, strtab->sh_offset, strtab->sh_size);
if (!str)
goto fail;
/* Commit */
s = qemu_mallocz(sizeof(*s));
#if (SZ == 64)
s->disas_symtab = syms32;
qemu_free(syms);
#else
s->disas_symtab = syms;
#endif
s->disas_num_syms = nsyms;
s->disas_strtab = str;
s->next = syminfos;
syminfos = s;
qemu_free(shdr_table);
return 0;
fail:
#if (SZ == 64)
qemu_free(syms32);
#endif
qemu_free(syms);
qemu_free(str);
qemu_free(shdr_table);
return -1;
}
int glue(load_elf, SZ)(int fd, int64_t virt_to_phys_addend, int must_swab)
{
struct elfhdr ehdr;
struct elf_phdr *phdr = NULL, *ph;
int size, i, total_size;
elf_word mem_size, addr;
uint8_t *data;
if (read(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))
goto fail;
if (must_swab) {
glue(bswap_ehdr, SZ)(&ehdr);
}
glue(load_symbols, SZ)(&ehdr, fd, must_swab);
size = ehdr.e_phnum * sizeof(phdr[0]);
lseek(fd, ehdr.e_phoff, SEEK_SET);
phdr = qemu_mallocz(size);
if (!phdr)
goto fail;
if (read(fd, phdr, size) != size)
goto fail;
if (must_swab) {
for(i = 0; i < ehdr.e_phnum; i++) {
ph = &phdr[i];
glue(bswap_phdr, SZ)(ph);
}
}
total_size = 0;
for(i = 0; i < ehdr.e_phnum; i++) {
ph = &phdr[i];
if (ph->p_type == PT_LOAD) {
mem_size = ph->p_memsz;
/* XXX: avoid allocating */
data = qemu_mallocz(mem_size);
if (ph->p_filesz > 0) {
lseek(fd, ph->p_offset, SEEK_SET);
if (read(fd, data, ph->p_filesz) != ph->p_filesz)
goto fail;
}
addr = ph->p_vaddr + virt_to_phys_addend;
cpu_physical_memory_write_rom(addr, data, mem_size);
total_size += mem_size;
qemu_free(data);
}
}
return total_size;
fail:
qemu_free(phdr);
return -1;
}

234
loader.c Normal file
View File

@ -0,0 +1,234 @@
/*
* 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 "vl.h"
#include "disas.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 */
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;
}
/* 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, uint8_t *addr)
{
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:
lseek(fd, N_TXTOFF(e), SEEK_SET);
size = read(fd, addr, e.a_text + e.a_data);
if (size < 0)
goto fail;
break;
case NMAGIC:
lseek(fd, N_TXTOFF(e), SEEK_SET);
size = read(fd, addr, e.a_text);
if (size < 0)
goto fail;
ret = read(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 bswapSZs bswap32s
#include "elf_ops.h"
#undef elfhdr
#undef elf_phdr
#undef elf_shdr
#undef elf_sym
#undef elf_note
#undef elf_word
#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 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)
{
int fd, data_order, must_swab, ret;
uint8_t e_ident[EI_NIDENT];
fd = open(filename, O_RDONLY);
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];
lseek(fd, 0, SEEK_SET);
if (e_ident[EI_CLASS] == ELFCLASS64) {
ret = load_elf64(fd, virt_to_phys_addend, must_swab);
} else {
ret = load_elf32(fd, virt_to_phys_addend, must_swab);
}
close(fd);
return ret;
fail:
close(fd);
return -1;
}

29
vl.c
View File

@ -332,35 +332,6 @@ int strstart(const char *str, const char *val, const char **ptr)
return 1;
}
/* 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 */
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;
}
void cpu_outb(CPUState *env, int addr, int val)
{
#ifdef DEBUG_IOPORT

8
vl.h
View File

@ -87,8 +87,6 @@ uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c);
void hw_error(const char *fmt, ...);
int get_image_size(const char *filename);
int load_image(const char *filename, uint8_t *addr);
extern const char *bios_dir;
void pstrcpy(char *buf, int buf_size, const char *str);
@ -871,8 +869,10 @@ void slavio_irq_info(void *opaque);
void slavio_pic_set_irq(void *opaque, int irq, int level);
void slavio_pic_set_irq_cpu(void *opaque, int irq, int level, unsigned int cpu);
/* magic-load.c */
int load_elf(const char *filename, uint8_t *addr);
/* loader.c */
int get_image_size(const char *filename);
int load_image(const char *filename, uint8_t *addr);
int load_elf(const char *filename, int64_t virt_to_phys_addend);
int load_aout(const char *filename, uint8_t *addr);
/* slavio_timer.c */