udis86/libudis86/syn.c

/* udis86 - libudis86/syn.c
 *
 * Copyright (c) 2002-2013 Vivek Thampi
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright notice,
 *       this list of conditions and the following disclaimer in the documentation
 *       and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#include "types.h"
#include "decode.h"
#include "syn.h"
#include "udint.h"

/*
 * Register Table - Order Matters (types.h)!
 *
 */
const char* ud_reg_tab[] =
{
  "al",   "cl",   "dl",   "bl",
  "ah",   "ch",   "dh",   "bh",
  "spl",  "bpl",  "sil",  "dil",
  "r8b",  "r9b",  "r10b", "r11b",
  "r12b", "r13b", "r14b", "r15b",

  "ax",   "cx",   "dx",   "bx",
  "sp",   "bp",   "si",   "di",
  "r8w",  "r9w",  "r10w", "r11w",
  "r12w", "r13w", "r14w", "r15w",

  "eax",  "ecx",  "edx",  "ebx",
  "esp",  "ebp",  "esi",  "edi",
  "r8d",  "r9d",  "r10d", "r11d",
  "r12d", "r13d", "r14d", "r15d",

  "rax",  "rcx",  "rdx",  "rbx",
  "rsp",  "rbp",  "rsi",  "rdi",
  "r8",   "r9",   "r10",  "r11",
  "r12",  "r13",  "r14",  "r15",

  "es",   "cs",   "ss",   "ds",
  "fs",   "gs",

  "cr0",  "cr1",  "cr2",  "cr3",
  "cr4",  "cr5",  "cr6",  "cr7",
  "cr8",  "cr9",  "cr10", "cr11",
  "cr12", "cr13", "cr14", "cr15",

  "dr0",  "dr1",  "dr2",  "dr3",
  "dr4",  "dr5",  "dr6",  "dr7",
  "dr8",  "dr9",  "dr10", "dr11",
  "dr12", "dr13", "dr14", "dr15",

  "mm0",  "mm1",  "mm2",  "mm3",
  "mm4",  "mm5",  "mm6",  "mm7",

  "st0",  "st1",  "st2",  "st3",
  "st4",  "st5",  "st6",  "st7",

  "xmm0", "xmm1", "xmm2", "xmm3",
  "xmm4", "xmm5", "xmm6", "xmm7",
  "xmm8", "xmm9", "xmm10", "xmm11",
  "xmm12", "xmm13", "xmm14", "xmm15",

  "ymm0", "ymm1", "ymm2",   "ymm3",
  "ymm4", "ymm5", "ymm6",   "ymm7",
  "ymm8", "ymm9", "ymm10",  "ymm11",
  "ymm12", "ymm13", "ymm14", "ymm15",

  "rip"
};


uint64_t
ud_syn_rel_target(struct ud *u, struct ud_operand *opr)
{
  const uint64_t trunc_mask = 0xffffffffffffffffull >> (64 - u->opr_mode);
  switch (opr->size) {
  case 8 : return (u->pc + opr->lval.sbyte)  & trunc_mask;
  case 16: return (u->pc + opr->lval.sword)  & trunc_mask;
  case 32: return (u->pc + opr->lval.sdword) & trunc_mask;
  default: UD_ASSERT(!"invalid relative offset size.");
    return 0ull;
  }
}


/*
 * asmprintf
 *    Printf style function for printing translated assembly
 *    output. Returns the number of characters written and
 *    moves the buffer pointer forward. On an overflow,
 *    returns a negative number and truncates the output.
 */
int
ud_asmprintf(struct ud *u, const char *fmt, ...)
{
  int ret;
  int avail;
  va_list ap;
  va_start(ap, fmt);
  avail = u->asm_buf_size - u->asm_buf_fill - 1 /* nullchar */;
  ret = vsnprintf((char*) u->asm_buf + u->asm_buf_fill, avail, fmt, ap);
  if (ret < 0 || ret > avail) {
      u->asm_buf_fill = u->asm_buf_size - 1;
  } else {
      u->asm_buf_fill += ret;
  }
  va_end(ap);
  return ret;
}


void
ud_syn_print_addr(struct ud *u, uint64_t addr)
{
  const char *name = NULL;
  if (u->sym_resolver) {
    int64_t offset = 0;
    name = u->sym_resolver(u, addr, &offset);
    if (name) {
      if (offset) {
        ud_asmprintf(u, "%s%+" FMT64 "d", name, offset);
      } else {
        ud_asmprintf(u, "%s", name);
      }
      return;
    }
  }
  ud_asmprintf(u, "0x%" FMT64 "x", addr);
}


void
ud_syn_print_imm(struct ud* u, const struct ud_operand *op)
{
  uint64_t v;
  if (op->_oprcode == OP_sI && op->size != u->opr_mode) {
    if (op->size == 8) {
      v = (int64_t)op->lval.sbyte;
    } else {
      UD_ASSERT(op->size == 32);
      v = (int64_t)op->lval.sdword;
    }
    if (u->opr_mode < 64) {
      v = v & ((1ull << u->opr_mode) - 1ull);
    }
  } else {
    switch (op->size) {
    case 8 : v = op->lval.ubyte;  break;
    case 16: v = op->lval.uword;  break;
    case 32: v = op->lval.udword; break;
    case 64: v = op->lval.uqword; break;
    default: UD_ASSERT(!"invalid offset"); v = 0; /* keep cc happy */
    }
  }
  ud_asmprintf(u, "0x%" FMT64 "x", v);
}


void
ud_syn_print_mem_disp(struct ud* u, const struct ud_operand *op, int sign)
{
  UD_ASSERT(op->offset != 0);
 if (op->base == UD_NONE && op->index == UD_NONE) {
    uint64_t v;
    UD_ASSERT(op->scale == UD_NONE && op->offset != 8);
    /* unsigned mem-offset */
    switch (op->offset) {
    case 16: v = op->lval.uword;  break;
    case 32: v = op->lval.udword; break;
    case 64: v = op->lval.uqword; break;
    default: UD_ASSERT(!"invalid offset"); v = 0; /* keep cc happy */
    }
    ud_asmprintf(u, "0x%" FMT64 "x", v);
  } else {
    int64_t v;
    UD_ASSERT(op->offset != 64);
    switch (op->offset) {
    case 8 : v = op->lval.sbyte;  break;
    case 16: v = op->lval.sword;  break;
    case 32: v = op->lval.sdword; break;
    default: UD_ASSERT(!"invalid offset"); v = 0; /* keep cc happy */
    }
    if (v < 0) {
      ud_asmprintf(u, "-0x%" FMT64 "x", -v);
    } else if (v > 0) {
      ud_asmprintf(u, "%s0x%" FMT64 "x", sign? "+" : "", v);
    }
  }
}

/*
vim: set ts=2 sw=2 expandtab
*/