mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
c3e88d8c4f
qemu/disas.c
ths 8f860bb83c s390 disassembler support, by Ulrich Hecht. 
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3104 c046a42c-6fe2-441c-8c8c-71466251a162
2007-07-31 23:44:21 +00:00

423 lines
11 KiB
C
Raw Blame History

/* 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. */
struct syminfo *syminfos = NULL;
/* 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;
}
/* Get LENGTH bytes from info's buffer, at target address memaddr.
Transfer them to myaddr. */
static int
target_read_memory (bfd_vma memaddr,
bfd_byte *myaddr,
int length,
struct disassemble_info *info)
{
int i;
for(i = 0; i < length; i++) {
myaddr[i] = ldub_code(memaddr + i);
}
return 0;
}
/* 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%" PRIx64 " 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%" PRIx64, 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;
}
bfd_vma bfd_getl16 (const bfd_byte *addr)
{
unsigned long v;
v = (unsigned long) addr[0];
v |= (unsigned long) addr[1] << 8;
return (bfd_vma) v;
}
bfd_vma bfd_getb16 (const bfd_byte *addr)
{
unsigned long v;
v = (unsigned long) addr[0] << 24;
v |= (unsigned long) addr[1] << 16;
return (bfd_vma) v;
}
#ifdef TARGET_ARM
static int
print_insn_thumb1(bfd_vma pc, disassemble_info *info)
{
return print_insn_arm(pc | 1, info);
}
#endif
/* Disassemble this for me please... (debugging). 'flags' has the following
values:
i386 - nonzero means 16 bit code
arm - nonzero means thumb code
ppc - nonzero means little endian
other targets - unused
*/
void target_disas(FILE *out, target_ulong code, target_ulong size, int flags)
{
target_ulong pc;
int count;
struct disassemble_info disasm_info;
int (*print_insn)(bfd_vma pc, disassemble_info *info);
INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
disasm_info.read_memory_func = target_read_memory;
disasm_info.buffer_vma = code;
disasm_info.buffer_length = size;
#ifdef TARGET_WORDS_BIGENDIAN
disasm_info.endian = BFD_ENDIAN_BIG;
#else
disasm_info.endian = BFD_ENDIAN_LITTLE;
#endif
#if defined(TARGET_I386)
if (flags == 2)
disasm_info.mach = bfd_mach_x86_64;
else if (flags == 1)
disasm_info.mach = bfd_mach_i386_i8086;
else
disasm_info.mach = bfd_mach_i386_i386;
print_insn = print_insn_i386;
#elif defined(TARGET_ARM)
if (flags)
print_insn = print_insn_thumb1;
else
print_insn = print_insn_arm;
#elif defined(TARGET_SPARC)
print_insn = print_insn_sparc;
#ifdef TARGET_SPARC64
disasm_info.mach = bfd_mach_sparc_v9b;
#endif
#elif defined(TARGET_PPC)
if (flags)
disasm_info.endian = BFD_ENDIAN_LITTLE;
#ifdef TARGET_PPC64
disasm_info.mach = bfd_mach_ppc64;
#else
disasm_info.mach = bfd_mach_ppc;
#endif
print_insn = print_insn_ppc;
#elif defined(TARGET_M68K)
print_insn = print_insn_m68k;
#elif defined(TARGET_MIPS)
#ifdef TARGET_WORDS_BIGENDIAN
print_insn = print_insn_big_mips;
#else
print_insn = print_insn_little_mips;
#endif
#elif defined(TARGET_SH4)
disasm_info.mach = bfd_mach_sh4;
print_insn = print_insn_sh;
#elif defined(TARGET_ALPHA)
disasm_info.mach = bfd_mach_alpha;
print_insn = print_insn_alpha;
#else
fprintf(out, "0x" TARGET_FMT_lx
": Asm output not supported on this arch\n", code);
return;
#endif
for (pc = code; pc < code + size; pc += count) {
fprintf(out, "0x" TARGET_FMT_lx ": ", pc);
count = print_insn(pc, &disasm_info);
#if 0
{
int i;
uint8_t b;
fprintf(out, " {");
for(i = 0; i < count; i++) {
target_read_memory(pc + i, &b, 1, &disasm_info);
fprintf(out, " %02x", b);
}
fprintf(out, " }");
}
#endif
fprintf(out, "\n");
if (count < 0)
break;
}
}
/* Disassemble this for me please... (debugging). */
void disas(FILE *out, void *code, unsigned long size)
{
unsigned long pc;
int count;
struct disassemble_info disasm_info;
int (*print_insn)(bfd_vma pc, disassemble_info *info);
INIT_DISASSEMBLE_INFO(disasm_info, out, fprintf);
disasm_info.buffer = code;
disasm_info.buffer_vma = (unsigned long)code;
disasm_info.buffer_length = size;
#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;
#if defined(__sparc_v8plus__) || defined(__sparc_v8plusa__) || defined(__sparc_v9__)
disasm_info.mach = bfd_mach_sparc_v9b;
#endif
#elif defined(__arm__)
print_insn = print_insn_arm;
#elif defined(__MIPSEB__)
print_insn = print_insn_big_mips;
#elif defined(__MIPSEL__)
print_insn = print_insn_little_mips;
#elif defined(__m68k__)
print_insn = print_insn_m68k;
#elif defined(__s390__)
print_insn = print_insn_s390;
#else
fprintf(out, "0x%lx: Asm output not supported on this arch\n",
(long) code);
return;
#endif
for (pc = (unsigned long)code; pc < (unsigned long)code + size; pc += count) {
fprintf(out, "0x%08lx: ", pc);
#ifdef __arm__
/* since data is included in the code, it is better to
display code data too */
fprintf(out, "%08x ", (int)bfd_getl32((const bfd_byte *)pc));
#endif
count = print_insn(pc, &disasm_info);
fprintf(out, "\n");
if (count < 0)
break;
}
}
/* Look up symbol for debugging purpose. Returns "" if unknown. */
const char *lookup_symbol(target_ulong orig_addr)
{
unsigned int i;
/* Hack, because we know this is x86. */
Elf32_Sym *sym;
struct syminfo *s;
target_ulong addr;
for (s = syminfos; s; s = s->next) {
sym = s->disas_symtab;
for (i = 0; i < s->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;
addr = sym[i].st_value;
#if defined(TARGET_ARM) || defined (TARGET_MIPS)
/* The bottom address bit marks a Thumb or MIPS16 symbol. */
addr &= ~(target_ulong)1;
#endif
if (orig_addr >= addr
&& orig_addr < addr + sym[i].st_size)
return s->disas_strtab + sym[i].st_name;
}
}
return "";
}
#if !defined(CONFIG_USER_ONLY)
void term_vprintf(const char *fmt, va_list ap);
void term_printf(const char *fmt, ...);
static int monitor_disas_is_physical;
static CPUState *monitor_disas_env;
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(monitor_disas_env, memaddr,myaddr, length, 0);
}
return 0;
}
static int monitor_fprintf(FILE *stream, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
term_vprintf(fmt, ap);
va_end(ap);
return 0;
}
void monitor_disas(CPUState *env,
target_ulong pc, int nb_insn, int is_physical, int flags)
{
int count, i;
struct disassemble_info disasm_info;
int (*print_insn)(bfd_vma pc, disassemble_info *info);
INIT_DISASSEMBLE_INFO(disasm_info, NULL, monitor_fprintf);
monitor_disas_env = env;
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 == 2)
disasm_info.mach = bfd_mach_x86_64;
else if (flags == 1)
disasm_info.mach = bfd_mach_i386_i8086;
else
disasm_info.mach = bfd_mach_i386_i386;
print_insn = print_insn_i386;
#elif defined(TARGET_ARM)
print_insn = print_insn_arm;
#elif defined(TARGET_SPARC)
print_insn = print_insn_sparc;
#ifdef TARGET_SPARC64
disasm_info.mach = bfd_mach_sparc_v9b;
#endif
#elif defined(TARGET_PPC)
#ifdef TARGET_PPC64
disasm_info.mach = bfd_mach_ppc64;
#else
disasm_info.mach = bfd_mach_ppc;
#endif
print_insn = print_insn_ppc;
#elif defined(TARGET_M68K)
print_insn = print_insn_m68k;
#elif defined(TARGET_MIPS)
#ifdef TARGET_WORDS_BIGENDIAN
print_insn = print_insn_big_mips;
#else
print_insn = print_insn_little_mips;
#endif
#else
term_printf("0x" TARGET_FMT_lx
": Asm output not supported on this arch\n", pc);
return;
#endif
for(i = 0; i < nb_insn; i++) {
term_printf("0x" TARGET_FMT_lx ": ", pc);
count = print_insn(pc, &disasm_info);
term_printf("\n");
if (count < 0)
break;
pc += count;
}
}
#endif
Reference in New Issue View Git Blame Copy Permalink