327 lines
9.2 KiB
C
327 lines
9.2 KiB
C
/*
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* Hacker Disassembler Engine 32 C
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* Copyright (c) 2008-2009, Vyacheslav Patkov.
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* All rights reserved.
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*
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*/
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#if defined(_M_IX86) || defined(__i386__)
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#include "hde32.h"
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#include "table32.h"
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unsigned int hde32_disasm(const void *code, hde32s *hs)
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{
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uint8_t x, c, *p = (uint8_t *)code, cflags, opcode, pref = 0;
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uint8_t *ht = hde32_table, m_mod, m_reg, m_rm, disp_size = 0;
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// Avoid using memset to reduce the footprint.
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#ifndef _MSC_VER
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memset((LPBYTE)hs, 0, sizeof(hde32s));
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#else
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__stosb((LPBYTE)hs, 0, sizeof(hde32s));
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#endif
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for (x = 16; x; x--)
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switch (c = *p++) {
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case 0xf3:
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hs->p_rep = c;
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pref |= PRE_F3;
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break;
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case 0xf2:
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hs->p_rep = c;
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pref |= PRE_F2;
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break;
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case 0xf0:
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hs->p_lock = c;
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pref |= PRE_LOCK;
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break;
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case 0x26: case 0x2e: case 0x36:
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case 0x3e: case 0x64: case 0x65:
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hs->p_seg = c;
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pref |= PRE_SEG;
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break;
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case 0x66:
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hs->p_66 = c;
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pref |= PRE_66;
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break;
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case 0x67:
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hs->p_67 = c;
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pref |= PRE_67;
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break;
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default:
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goto pref_done;
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}
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pref_done:
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hs->flags = (uint32_t)pref << 23;
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if (!pref)
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pref |= PRE_NONE;
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if ((hs->opcode = c) == 0x0f) {
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hs->opcode2 = c = *p++;
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ht += DELTA_OPCODES;
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} else if (c >= 0xa0 && c <= 0xa3) {
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if (pref & PRE_67)
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pref |= PRE_66;
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else
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pref &= ~PRE_66;
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}
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opcode = c;
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cflags = ht[ht[opcode / 4] + (opcode % 4)];
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if (cflags == C_ERROR) {
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hs->flags |= F_ERROR | F_ERROR_OPCODE;
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cflags = 0;
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if ((opcode & -3) == 0x24)
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cflags++;
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}
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x = 0;
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if (cflags & C_GROUP) {
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uint16_t t;
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t = *(uint16_t *)(ht + (cflags & 0x7f));
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cflags = (uint8_t)t;
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x = (uint8_t)(t >> 8);
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}
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if (hs->opcode2) {
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ht = hde32_table + DELTA_PREFIXES;
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if (ht[ht[opcode / 4] + (opcode % 4)] & pref)
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hs->flags |= F_ERROR | F_ERROR_OPCODE;
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}
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if (cflags & C_MODRM) {
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hs->flags |= F_MODRM;
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hs->modrm = c = *p++;
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hs->modrm_mod = m_mod = c >> 6;
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hs->modrm_rm = m_rm = c & 7;
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hs->modrm_reg = m_reg = (c & 0x3f) >> 3;
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if (x && ((x << m_reg) & 0x80))
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hs->flags |= F_ERROR | F_ERROR_OPCODE;
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if (!hs->opcode2 && opcode >= 0xd9 && opcode <= 0xdf) {
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uint8_t t = opcode - 0xd9;
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if (m_mod == 3) {
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ht = hde32_table + DELTA_FPU_MODRM + t*8;
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t = ht[m_reg] << m_rm;
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} else {
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ht = hde32_table + DELTA_FPU_REG;
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t = ht[t] << m_reg;
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}
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if (t & 0x80)
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hs->flags |= F_ERROR | F_ERROR_OPCODE;
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}
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if (pref & PRE_LOCK) {
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if (m_mod == 3) {
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hs->flags |= F_ERROR | F_ERROR_LOCK;
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} else {
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uint8_t *table_end, op = opcode;
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if (hs->opcode2) {
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ht = hde32_table + DELTA_OP2_LOCK_OK;
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table_end = ht + DELTA_OP_ONLY_MEM - DELTA_OP2_LOCK_OK;
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} else {
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ht = hde32_table + DELTA_OP_LOCK_OK;
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table_end = ht + DELTA_OP2_LOCK_OK - DELTA_OP_LOCK_OK;
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op &= -2;
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}
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for (; ht != table_end; ht++)
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if (*ht++ == op) {
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if (!((*ht << m_reg) & 0x80))
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goto no_lock_error;
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else
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break;
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}
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hs->flags |= F_ERROR | F_ERROR_LOCK;
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no_lock_error:
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;
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}
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}
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if (hs->opcode2) {
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switch (opcode) {
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case 0x20: case 0x22:
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m_mod = 3;
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if (m_reg > 4 || m_reg == 1)
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goto error_operand;
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else
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goto no_error_operand;
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case 0x21: case 0x23:
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m_mod = 3;
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if (m_reg == 4 || m_reg == 5)
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goto error_operand;
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else
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goto no_error_operand;
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}
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} else {
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switch (opcode) {
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case 0x8c:
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if (m_reg > 5)
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goto error_operand;
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else
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goto no_error_operand;
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case 0x8e:
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if (m_reg == 1 || m_reg > 5)
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goto error_operand;
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else
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goto no_error_operand;
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}
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}
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if (m_mod == 3) {
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uint8_t *table_end;
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if (hs->opcode2) {
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ht = hde32_table + DELTA_OP2_ONLY_MEM;
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table_end = ht + sizeof(hde32_table) - DELTA_OP2_ONLY_MEM;
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} else {
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ht = hde32_table + DELTA_OP_ONLY_MEM;
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table_end = ht + DELTA_OP2_ONLY_MEM - DELTA_OP_ONLY_MEM;
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}
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for (; ht != table_end; ht += 2)
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if (*ht++ == opcode) {
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if (*ht++ & pref && !((*ht << m_reg) & 0x80))
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goto error_operand;
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else
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break;
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}
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goto no_error_operand;
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} else if (hs->opcode2) {
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switch (opcode) {
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case 0x50: case 0xd7: case 0xf7:
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if (pref & (PRE_NONE | PRE_66))
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goto error_operand;
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break;
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case 0xd6:
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if (pref & (PRE_F2 | PRE_F3))
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goto error_operand;
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break;
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case 0xc5:
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goto error_operand;
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}
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goto no_error_operand;
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} else
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goto no_error_operand;
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error_operand:
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hs->flags |= F_ERROR | F_ERROR_OPERAND;
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no_error_operand:
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c = *p++;
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if (m_reg <= 1) {
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if (opcode == 0xf6)
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cflags |= C_IMM8;
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else if (opcode == 0xf7)
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cflags |= C_IMM_P66;
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}
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switch (m_mod) {
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case 0:
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if (pref & PRE_67) {
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if (m_rm == 6)
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disp_size = 2;
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} else
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if (m_rm == 5)
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disp_size = 4;
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break;
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case 1:
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disp_size = 1;
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break;
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case 2:
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disp_size = 2;
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if (!(pref & PRE_67))
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disp_size <<= 1;
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}
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if (m_mod != 3 && m_rm == 4 && !(pref & PRE_67)) {
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hs->flags |= F_SIB;
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p++;
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hs->sib = c;
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hs->sib_scale = c >> 6;
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hs->sib_index = (c & 0x3f) >> 3;
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if ((hs->sib_base = c & 7) == 5 && !(m_mod & 1))
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disp_size = 4;
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}
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p--;
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switch (disp_size) {
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case 1:
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hs->flags |= F_DISP8;
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hs->disp.disp8 = *p;
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break;
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case 2:
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hs->flags |= F_DISP16;
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hs->disp.disp16 = *(uint16_t *)p;
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break;
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case 4:
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hs->flags |= F_DISP32;
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hs->disp.disp32 = *(uint32_t *)p;
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}
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p += disp_size;
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} else if (pref & PRE_LOCK)
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hs->flags |= F_ERROR | F_ERROR_LOCK;
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if (cflags & C_IMM_P66) {
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if (cflags & C_REL32) {
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if (pref & PRE_66) {
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hs->flags |= F_IMM16 | F_RELATIVE;
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hs->imm.imm16 = *(uint16_t *)p;
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p += 2;
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goto disasm_done;
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}
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goto rel32_ok;
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}
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if (pref & PRE_66) {
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hs->flags |= F_IMM16;
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hs->imm.imm16 = *(uint16_t *)p;
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p += 2;
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} else {
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hs->flags |= F_IMM32;
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hs->imm.imm32 = *(uint32_t *)p;
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p += 4;
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}
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}
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if (cflags & C_IMM16) {
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if (hs->flags & F_IMM32) {
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hs->flags |= F_IMM16;
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hs->disp.disp16 = *(uint16_t *)p;
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} else if (hs->flags & F_IMM16) {
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hs->flags |= F_2IMM16;
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hs->disp.disp16 = *(uint16_t *)p;
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} else {
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hs->flags |= F_IMM16;
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hs->imm.imm16 = *(uint16_t *)p;
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}
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p += 2;
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}
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if (cflags & C_IMM8) {
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hs->flags |= F_IMM8;
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hs->imm.imm8 = *p++;
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}
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if (cflags & C_REL32) {
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rel32_ok:
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hs->flags |= F_IMM32 | F_RELATIVE;
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hs->imm.imm32 = *(uint32_t *)p;
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p += 4;
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} else if (cflags & C_REL8) {
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hs->flags |= F_IMM8 | F_RELATIVE;
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hs->imm.imm8 = *p++;
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}
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disasm_done:
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if ((hs->len = (uint8_t)(p-(uint8_t *)code)) > 15) {
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hs->flags |= F_ERROR | F_ERROR_LENGTH;
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hs->len = 15;
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}
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return (unsigned int)hs->len;
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}
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#endif // defined(_M_IX86) || defined(__i386__)
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