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 "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(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)

{

    cpu_memory_rw_debug(cpu_single_env, memaddr, myaddr, length, 0);

    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 (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 minuscule 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 (bfd_vma addr, struct disassemble_info *info)

{

    (*info->fprintf_func) (info->stream, "0x%" PRIx64, addr);

}

/* Print address in hex, truncated to the width of a target virtual address. */

static void

generic_print_target_address(bfd_vma addr, struct disassemble_info *info)

{

    uint64_t mask = ~0ULL >> (64 - TARGET_VIRT_ADDR_SPACE_BITS);

    generic_print_address(addr & mask, info);

}

/* Print address in hex, truncated to the width of a host virtual address. */

static void

generic_print_host_address(bfd_vma addr, struct disassemble_info *info)

{

    uint64_t mask = ~0ULL >> (64 - (sizeof(void *) * 8));

    generic_print_address(addr & mask, info);

}

/* Just return the given address.  */

int

generic_symbol_at_address (bfd_vma addr, struct disassemble_info *info)

{

  return 1;

}

bfd_vma bfd_getl64 (const bfd_byte *addr)

{

  unsigned long long v;

  v = (unsigned long long) addr[0];

  v |= (unsigned long long) addr[1] << 8;

  v |= (unsigned long long) addr[2] << 16;

  v |= (unsigned long long) addr[3] << 24;

  v |= (unsigned long long) addr[4] << 32;

  v |= (unsigned long long) addr[5] << 40;

  v |= (unsigned long long) addr[6] << 48;

  v |= (unsigned long long) addr[7] << 56;

  return (bfd_vma) v;

}

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 - 1 means 16 bit code, 2 means 64 bit code

    arm  - bit 0 = thumb, bit 1 = reverse endian

    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;

    disasm_info.print_address_func = generic_print_target_address;

#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 & 1) {

        print_insn = print_insn_thumb1;

    } else {

        print_insn = print_insn_arm;

    }

    if (flags & 2) {

#ifdef TARGET_WORDS_BIGENDIAN

        disasm_info.endian = BFD_ENDIAN_LITTLE;

#else

        disasm_info.endian = BFD_ENDIAN_BIG;

#endif

    }

#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 >> 16)

        disasm_info.endian = BFD_ENDIAN_LITTLE;

    if (flags & 0xFFFF) {

        /* If we have a precise definitions of the instructions set, use it */

        disasm_info.mach = flags & 0xFFFF;

    } else {

#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_ev6;

    print_insn = print_insn_alpha;

#elif defined(TARGET_CRIS)

    if (flags != 32) {

        disasm_info.mach = bfd_mach_cris_v0_v10;

        print_insn = print_insn_crisv10;

    } else {

        disasm_info.mach = bfd_mach_cris_v32;

        print_insn = print_insn_crisv32;

    }

#elif defined(TARGET_S390X)

    disasm_info.mach = bfd_mach_s390_64;

    print_insn = print_insn_s390;

#elif defined(TARGET_MICROBLAZE)

    disasm_info.mach = bfd_arch_microblaze;

    print_insn = print_insn_microblaze;

#elif defined(TARGET_LM32)

    disasm_info.mach = bfd_mach_lm32;

    print_insn = print_insn_lm32;

#else

    fprintf(out, "0x" TARGET_FMT_lx

            ": Asm output not supported on this arch\n", code);

    return;

#endif

    for (pc = code; size > 0; pc += count, size -= 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;

        if (size < count) {

            fprintf(out,

                    "Disassembler disagrees with translator over instruction "

                    "decoding\n"

                    "Please report this to qemu-devel@nongnu.org\n");

            break;

        }

    }

}

/* Disassemble this for me please... (debugging). */

void disas(FILE *out, void *code, unsigned long size)

{

    uintptr_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);

    disasm_info.print_address_func = generic_print_host_address;

    disasm_info.buffer = code;

    disasm_info.buffer_vma = (uintptr_t)code;

    disasm_info.buffer_length = size;

#ifdef HOST_WORDS_BIGENDIAN

    disasm_info.endian = BFD_ENDIAN_BIG;

#else

    disasm_info.endian = BFD_ENDIAN_LITTLE;

#endif

#if defined(CONFIG_TCG_INTERPRETER)

    print_insn = print_insn_tci;

#elif 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(_ARCH_PPC)

    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;

#elif defined(__hppa__)

    print_insn = print_insn_hppa;

#elif defined(__ia64__)

    print_insn = print_insn_ia64;

#else

    fprintf(out, "0x%lx: Asm output not supported on this arch\n",

            (long) code);

    return;

#endif

    for (pc = (uintptr_t)code; size > 0; pc += count, size -= count) {

        fprintf(out, "0x%08" PRIxPTR ":  ", pc);

        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)

{

    const char *symbol = "";

    struct syminfo *s;

    for (s = syminfos; s; s = s->next) {

        symbol = s->lookup_symbol(s, orig_addr);

        if (symbol[0] != '\0') {

            break;

        }

    }

    return symbol;

}

#if !defined(CONFIG_USER_ONLY)

#include "monitor.h"

static int monitor_disas_is_physical;

static CPUArchState *monitor_disas_env;

static int

monitor_read_memory (bfd_vma memaddr, bfd_byte *myaddr, int length,

                     struct disassemble_info *info)

{

    if (monitor_disas_is_physical) {

        cpu_physical_memory_read(memaddr, myaddr, length);

    } else {

        cpu_memory_rw_debug(monitor_disas_env, memaddr,myaddr, length, 0);

    }

    return 0;

}

static int GCC_FMT_ATTR(2, 3)

monitor_fprintf(FILE *stream, const char *fmt, ...)

{

    va_list ap;

    va_start(ap, fmt);

    monitor_vprintf((Monitor *)stream, fmt, ap);

    va_end(ap);

    return 0;

}

void monitor_disas(Monitor *mon, CPUArchState *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, (FILE *)mon, monitor_fprintf);

    monitor_disas_env = env;

    monitor_disas_is_physical = is_physical;

    disasm_info.read_memory_func = monitor_read_memory;

    disasm_info.print_address_func = generic_print_target_address;

    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_ALPHA)

    print_insn = print_insn_alpha;

#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

#elif defined(TARGET_SH4)

    disasm_info.mach = bfd_mach_sh4;

    print_insn = print_insn_sh;

#elif defined(TARGET_S390X)

    disasm_info.mach = bfd_mach_s390_64;

    print_insn = print_insn_s390;

#elif defined(TARGET_LM32)

    disasm_info.mach = bfd_mach_lm32;

    print_insn = print_insn_lm32;

#else

    monitor_printf(mon, "0x" TARGET_FMT_lx

                   ": Asm output not supported on this arch\n", pc);

    return;

#endif

    for(i = 0; i < nb_insn; i++) {

        monitor_printf(mon, "0x" TARGET_FMT_lx ":  ", pc);

        count = print_insn(pc, &disasm_info);

        monitor_printf(mon, "\n");

        if (count < 0)

            break;

        pc += count;

    }

}

#endif