mirror of
https://github.com/qemu/qemu.git
synced 2024-11-25 20:03:37 +08:00
9307c4c1d9
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@703 c046a42c-6fe2-441c-8c8c-71466251a162
290 lines
7.2 KiB
C
290 lines
7.2 KiB
C
/* General "disassemble this chunk" code. Used for debugging. */
|
|
#include "config.h"
|
|
#include "dis-asm.h"
|
|
#include "elf.h"
|
|
#include <errno.h>
|
|
|
|
#include "cpu.h"
|
|
#include "exec-all.h"
|
|
#include "disas.h"
|
|
|
|
/* Filled in by elfload.c. Simplistic, but will do for now. */
|
|
unsigned int disas_num_syms;
|
|
void *disas_symtab;
|
|
const char *disas_strtab;
|
|
|
|
/* Get LENGTH bytes from info's buffer, at target address memaddr.
|
|
Transfer them to myaddr. */
|
|
int
|
|
buffer_read_memory (memaddr, myaddr, length, info)
|
|
bfd_vma memaddr;
|
|
bfd_byte *myaddr;
|
|
int length;
|
|
struct disassemble_info *info;
|
|
{
|
|
if (memaddr < info->buffer_vma
|
|
|| memaddr + length > info->buffer_vma + info->buffer_length)
|
|
/* Out of bounds. Use EIO because GDB uses it. */
|
|
return EIO;
|
|
memcpy (myaddr, info->buffer + (memaddr - info->buffer_vma), length);
|
|
return 0;
|
|
}
|
|
|
|
#if !defined(CONFIG_USER_ONLY)
|
|
/* Get LENGTH bytes from info's buffer, at target address memaddr.
|
|
Transfer them to myaddr. */
|
|
static int
|
|
target_read_memory (memaddr, myaddr, length, info)
|
|
bfd_vma memaddr;
|
|
bfd_byte *myaddr;
|
|
int length;
|
|
struct disassemble_info *info;
|
|
{
|
|
int i;
|
|
for(i = 0; i < length; i++) {
|
|
myaddr[i] = ldub_code((void *)((long)memaddr + i));
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/* Print an error message. We can assume that this is in response to
|
|
an error return from buffer_read_memory. */
|
|
void
|
|
perror_memory (status, memaddr, info)
|
|
int status;
|
|
bfd_vma memaddr;
|
|
struct disassemble_info *info;
|
|
{
|
|
if (status != EIO)
|
|
/* Can't happen. */
|
|
(*info->fprintf_func) (info->stream, "Unknown error %d\n", status);
|
|
else
|
|
/* Actually, address between memaddr and memaddr + len was
|
|
out of bounds. */
|
|
(*info->fprintf_func) (info->stream,
|
|
"Address 0x%llx is out of bounds.\n", memaddr);
|
|
}
|
|
|
|
/* This could be in a separate file, to save miniscule amounts of space
|
|
in statically linked executables. */
|
|
|
|
/* Just print the address is hex. This is included for completeness even
|
|
though both GDB and objdump provide their own (to print symbolic
|
|
addresses). */
|
|
|
|
void
|
|
generic_print_address (addr, info)
|
|
bfd_vma addr;
|
|
struct disassemble_info *info;
|
|
{
|
|
(*info->fprintf_func) (info->stream, "0x%llx", addr);
|
|
}
|
|
|
|
/* Just return the given address. */
|
|
|
|
int
|
|
generic_symbol_at_address (addr, info)
|
|
bfd_vma addr;
|
|
struct disassemble_info * info;
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
bfd_vma bfd_getl32 (const bfd_byte *addr)
|
|
{
|
|
unsigned long v;
|
|
|
|
v = (unsigned long) addr[0];
|
|
v |= (unsigned long) addr[1] << 8;
|
|
v |= (unsigned long) addr[2] << 16;
|
|
v |= (unsigned long) addr[3] << 24;
|
|
return (bfd_vma) v;
|
|
}
|
|
|
|
bfd_vma bfd_getb32 (const bfd_byte *addr)
|
|
{
|
|
unsigned long v;
|
|
|
|
v = (unsigned long) addr[0] << 24;
|
|
v |= (unsigned long) addr[1] << 16;
|
|
v |= (unsigned long) addr[2] << 8;
|
|
v |= (unsigned long) addr[3];
|
|
return (bfd_vma) v;
|
|
}
|
|
|
|
/* Disassemble this for me please... (debugging). 'flags' is only used
|
|
for i386: non zero means 16 bit code */
|
|
void disas(FILE *out, void *code, unsigned long size, int is_host, int flags)
|
|
{
|
|
uint8_t *pc;
|
|
int count;
|
|
struct disassemble_info disasm_info;
|
|
int (*print_insn)(bfd_vma pc, disassemble_info *info);
|
|
|
|
INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
|
|
|
|
#if !defined(CONFIG_USER_ONLY)
|
|
if (!is_host) {
|
|
disasm_info.read_memory_func = target_read_memory;
|
|
}
|
|
#endif
|
|
|
|
disasm_info.buffer = code;
|
|
disasm_info.buffer_vma = (unsigned long)code;
|
|
disasm_info.buffer_length = size;
|
|
|
|
if (is_host) {
|
|
#ifdef WORDS_BIGENDIAN
|
|
disasm_info.endian = BFD_ENDIAN_BIG;
|
|
#else
|
|
disasm_info.endian = BFD_ENDIAN_LITTLE;
|
|
#endif
|
|
#if defined(__i386__)
|
|
disasm_info.mach = bfd_mach_i386_i386;
|
|
print_insn = print_insn_i386;
|
|
#elif defined(__x86_64__)
|
|
disasm_info.mach = bfd_mach_x86_64;
|
|
print_insn = print_insn_i386;
|
|
#elif defined(__powerpc__)
|
|
print_insn = print_insn_ppc;
|
|
#elif defined(__alpha__)
|
|
print_insn = print_insn_alpha;
|
|
#elif defined(__sparc__)
|
|
print_insn = print_insn_sparc;
|
|
#elif defined(__arm__)
|
|
print_insn = print_insn_arm;
|
|
#else
|
|
fprintf(out, "Asm output not supported on this arch\n");
|
|
return;
|
|
#endif
|
|
} else {
|
|
#ifdef TARGET_WORDS_BIGENDIAN
|
|
disasm_info.endian = BFD_ENDIAN_BIG;
|
|
#else
|
|
disasm_info.endian = BFD_ENDIAN_LITTLE;
|
|
#endif
|
|
#if defined(TARGET_I386)
|
|
if (!flags)
|
|
disasm_info.mach = bfd_mach_i386_i386;
|
|
else
|
|
disasm_info.mach = bfd_mach_i386_i8086;
|
|
print_insn = print_insn_i386;
|
|
#elif defined(TARGET_ARM)
|
|
print_insn = print_insn_arm;
|
|
#elif defined(TARGET_SPARC)
|
|
print_insn = print_insn_sparc;
|
|
#elif defined(TARGET_PPC)
|
|
print_insn = print_insn_ppc;
|
|
#else
|
|
fprintf(out, "Asm output not supported on this arch\n");
|
|
return;
|
|
#endif
|
|
}
|
|
|
|
for (pc = code; pc < (uint8_t *)code + size; pc += count) {
|
|
fprintf(out, "0x%08lx: ", (long)pc);
|
|
#ifdef __arm__
|
|
/* since data are included in the code, it is better to
|
|
display code data too */
|
|
if (is_host) {
|
|
fprintf(out, "%08x ", (int)bfd_getl32((const bfd_byte *)pc));
|
|
}
|
|
#endif
|
|
count = print_insn((unsigned long)pc, &disasm_info);
|
|
fprintf(out, "\n");
|
|
if (count < 0)
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Look up symbol for debugging purpose. Returns "" if unknown. */
|
|
const char *lookup_symbol(void *orig_addr)
|
|
{
|
|
unsigned int i;
|
|
/* Hack, because we know this is x86. */
|
|
Elf32_Sym *sym = disas_symtab;
|
|
|
|
for (i = 0; i < disas_num_syms; i++) {
|
|
if (sym[i].st_shndx == SHN_UNDEF
|
|
|| sym[i].st_shndx >= SHN_LORESERVE)
|
|
continue;
|
|
|
|
if (ELF_ST_TYPE(sym[i].st_info) != STT_FUNC)
|
|
continue;
|
|
|
|
if ((long)orig_addr >= sym[i].st_value
|
|
&& (long)orig_addr < sym[i].st_value + sym[i].st_size)
|
|
return disas_strtab + sym[i].st_name;
|
|
}
|
|
return "";
|
|
}
|
|
|
|
#if !defined(CONFIG_USER_ONLY)
|
|
|
|
static int monitor_disas_is_physical;
|
|
|
|
static int
|
|
monitor_read_memory (memaddr, myaddr, length, info)
|
|
bfd_vma memaddr;
|
|
bfd_byte *myaddr;
|
|
int length;
|
|
struct disassemble_info *info;
|
|
{
|
|
if (monitor_disas_is_physical) {
|
|
cpu_physical_memory_rw(memaddr, myaddr, length, 0);
|
|
} else {
|
|
cpu_memory_rw_debug(cpu_single_env, memaddr,myaddr, length, 0);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void monitor_disas(target_ulong pc, int nb_insn, int is_physical, int flags)
|
|
{
|
|
FILE *out;
|
|
int count, i;
|
|
struct disassemble_info disasm_info;
|
|
int (*print_insn)(bfd_vma pc, disassemble_info *info);
|
|
|
|
out = stdout;
|
|
|
|
INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
|
|
|
|
monitor_disas_is_physical = is_physical;
|
|
disasm_info.read_memory_func = monitor_read_memory;
|
|
|
|
disasm_info.buffer_vma = pc;
|
|
|
|
#ifdef TARGET_WORDS_BIGENDIAN
|
|
disasm_info.endian = BFD_ENDIAN_BIG;
|
|
#else
|
|
disasm_info.endian = BFD_ENDIAN_LITTLE;
|
|
#endif
|
|
#if defined(TARGET_I386)
|
|
if (!flags)
|
|
disasm_info.mach = bfd_mach_i386_i386;
|
|
else
|
|
disasm_info.mach = bfd_mach_i386_i8086;
|
|
print_insn = print_insn_i386;
|
|
#elif defined(TARGET_ARM)
|
|
print_insn = print_insn_arm;
|
|
#elif defined(TARGET_SPARC)
|
|
print_insn = print_insn_sparc;
|
|
#elif defined(TARGET_PPC)
|
|
print_insn = print_insn_ppc;
|
|
#else
|
|
fprintf(out, "Asm output not supported on this arch\n");
|
|
return;
|
|
#endif
|
|
|
|
for(i = 0; i < nb_insn; i++) {
|
|
fprintf(out, "0x%08lx: ", (unsigned long)pc);
|
|
count = print_insn(pc, &disasm_info);
|
|
fprintf(out, "\n");
|
|
if (count < 0)
|
|
break;
|
|
pc += count;
|
|
}
|
|
}
|
|
#endif
|