Archipelago » qemu

/* 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%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 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)

    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, "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;

#elif defined(__arm__) 

    print_insn = print_insn_arm;

#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 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(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;

    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;

            if (orig_addr >= sym[i].st_value

                && orig_addr < sym[i].st_value + 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 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;

}

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(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_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;

#elif defined(TARGET_PPC)

    print_insn = print_insn_ppc;

#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