662 lines
18 KiB
C++
Executable File
662 lines
18 KiB
C++
Executable File
/////////////////////////////////////////////////////////////////////////
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// $Id: resolve.cc,v 1.20 2009-12-28 13:52:40 sshwarts Exp $
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2005-2009 Stanislav Shwartsman
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// Written by Stanislav Shwartsman [sshwarts at sourceforge net]
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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//
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/////////////////////////////////////////////////////////////////////////
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#include <stdio.h>
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#include <assert.h>
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#include "disasm.h"
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void disassembler::decode_modrm(x86_insn *insn)
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{
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insn->modrm = fetch_byte();
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BX_DECODE_MODRM(insn->modrm, insn->mod, insn->nnn, insn->rm);
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// MOVs with CRx and DRx always use register ops and ignore the mod field.
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if ((insn->b1 & ~3) == 0x120) insn->mod = 3;
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insn->nnn |= insn->rex_r;
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insn->rm |= insn->rex_b;
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if (insn->mod == 3) {
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return; /* mod, reg, reg */
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}
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if (insn->as_64)
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{
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if ((insn->rm & 7) != 4) { /* rm != 100b, no s-i-b byte */
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// one byte modrm
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switch (insn->mod) {
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case 0:
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resolve_modrm = &disassembler::resolve64_mod0;
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if ((insn->rm & 7) == 5) /* no reg, 32-bit displacement */
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insn->displacement.displ32 = fetch_dword();
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break;
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case 1:
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/* reg, 8-bit displacement, sign extend */
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resolve_modrm = &disassembler::resolve64_mod1or2;
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insn->displacement.displ32 = (Bit8s) fetch_byte();
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break;
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case 2:
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/* reg, 32-bit displacement */
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resolve_modrm = &disassembler::resolve64_mod1or2;
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insn->displacement.displ32 = fetch_dword();
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break;
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} /* switch (mod) */
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} /* if (rm != 4) */
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else { /* rm == 4, s-i-b byte follows */
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insn->sib = fetch_byte();
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BX_DECODE_SIB(insn->sib, insn->scale, insn->index, insn->base);
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insn->base |= insn->rex_b;
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insn->index |= insn->rex_x;
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switch (insn->mod) {
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case 0:
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resolve_modrm = &disassembler::resolve64_mod0_rm4;
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if ((insn->base & 7) == 5)
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insn->displacement.displ32 = fetch_dword();
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break;
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case 1:
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resolve_modrm = &disassembler::resolve64_mod1or2_rm4;
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insn->displacement.displ32 = (Bit8s) fetch_byte();
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break;
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case 2:
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resolve_modrm = &disassembler::resolve64_mod1or2_rm4;
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insn->displacement.displ32 = fetch_dword();
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break;
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}
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} /* s-i-b byte follows */
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}
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else
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{
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if (insn->as_32)
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{
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if ((insn->rm & 7) != 4) { /* rm != 100b, no s-i-b byte */
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// one byte modrm
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switch (insn->mod) {
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case 0:
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resolve_modrm = &disassembler::resolve32_mod0;
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if ((insn->rm & 7) == 5) /* no reg, 32-bit displacement */
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insn->displacement.displ32 = fetch_dword();
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break;
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case 1:
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/* reg, 8-bit displacement, sign extend */
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resolve_modrm = &disassembler::resolve32_mod1or2;
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insn->displacement.displ32 = (Bit8s) fetch_byte();
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break;
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case 2:
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/* reg, 32-bit displacement */
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resolve_modrm = &disassembler::resolve32_mod1or2;
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insn->displacement.displ32 = fetch_dword();
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break;
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} /* switch (mod) */
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} /* if (rm != 4) */
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else { /* rm == 4, s-i-b byte follows */
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insn->sib = fetch_byte();
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BX_DECODE_SIB(insn->sib, insn->scale, insn->index, insn->base);
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insn->base |= insn->rex_b;
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insn->index |= insn->rex_x;
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switch (insn->mod) {
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case 0:
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resolve_modrm = &disassembler::resolve32_mod0_rm4;
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if ((insn->base & 7) == 5)
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insn->displacement.displ32 = fetch_dword();
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break;
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case 1:
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resolve_modrm = &disassembler::resolve32_mod1or2_rm4;
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insn->displacement.displ32 = (Bit8s) fetch_byte();
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break;
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case 2:
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resolve_modrm = &disassembler::resolve32_mod1or2_rm4;
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insn->displacement.displ32 = fetch_dword();
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break;
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}
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} /* s-i-b byte follows */
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}
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else {
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assert(insn->rex_b == 0);
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assert(insn->rex_x == 0);
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assert(insn->rex_r == 0);
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/* 16 bit addressing modes. */
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switch (insn->mod) {
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case 0:
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resolve_modrm = &disassembler::resolve16_mod0;
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if(insn->rm == 6)
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insn->displacement.displ16 = fetch_word();
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break;
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case 1:
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/* reg, 8-bit displacement, sign extend */
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resolve_modrm = &disassembler::resolve16_mod1or2;
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insn->displacement.displ16 = (Bit8s) fetch_byte();
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break;
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case 2:
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resolve_modrm = &disassembler::resolve16_mod1or2;
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insn->displacement.displ16 = fetch_word();
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break;
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} /* switch (mod) ... */
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}
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}
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}
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void disassembler::resolve16_mod0(const x86_insn *insn, unsigned mode)
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{
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const char *seg;
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if (insn->is_seg_override())
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seg = segment_name[insn->seg_override];
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else
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seg = sreg_mod00_rm16[insn->rm];
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if(insn->rm == 6)
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print_memory_access16(mode, seg, NULL, insn->displacement.displ16);
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else
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print_memory_access16(mode, seg, index16[insn->rm], 0);
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}
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void disassembler::resolve16_mod1or2(const x86_insn *insn, unsigned mode)
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{
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const char *seg;
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if (insn->is_seg_override())
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seg = segment_name[insn->seg_override];
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else
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seg = sreg_mod01or10_rm16[insn->rm];
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print_memory_access16(mode, seg, index16[insn->rm], insn->displacement.displ16);
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}
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void disassembler::resolve32_mod0(const x86_insn *insn, unsigned mode)
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{
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const char *seg, *eip_regname = NULL;
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if (insn->is_seg_override())
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seg = segment_name[insn->seg_override];
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else
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seg = segment_name[DS_REG];
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if (insn->is_64) {
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if (intel_mode) eip_regname = "eip";
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else eip_regname = "%eip";
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}
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if ((insn->rm & 7) == 5) /* no reg, 32-bit displacement */
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print_memory_access32(mode, seg, eip_regname, NULL, 0, insn->displacement.displ32);
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else
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print_memory_access32(mode, seg, general_32bit_regname[insn->rm], NULL, 0, 0);
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}
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void disassembler::resolve32_mod1or2(const x86_insn *insn, unsigned mode)
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{
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const char *seg;
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if (insn->is_seg_override())
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seg = segment_name[insn->seg_override];
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else
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seg = sreg_mod01or10_rm32[insn->rm];
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print_memory_access32(mode, seg,
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general_32bit_regname[insn->rm], NULL, 0, insn->displacement.displ32);
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}
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void disassembler::resolve32_mod0_rm4(const x86_insn *insn, unsigned mode)
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{
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const char *seg, *base = NULL, *index = NULL;
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Bit32u disp32 = 0;
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if (insn->is_seg_override())
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seg = segment_name[insn->seg_override];
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else
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seg = sreg_mod00_base32[insn->base];
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if ((insn->base & 7) != 5)
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base = general_32bit_regname[insn->base];
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else
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disp32 = insn->displacement.displ32;
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if (insn->index != 4)
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index = general_32bit_regname[insn->index];
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print_memory_access32(mode, seg, base, index, insn->scale, disp32);
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}
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void disassembler::resolve32_mod1or2_rm4(const x86_insn *insn, unsigned mode)
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{
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const char *seg, *index = NULL;
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if (insn->is_seg_override())
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seg = segment_name[insn->seg_override];
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else
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seg = sreg_mod01or10_base32[insn->base];
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if (insn->index != 4)
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index = general_32bit_regname[insn->index];
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print_memory_access32(mode, seg,
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general_32bit_regname[insn->base], index, insn->scale, insn->displacement.displ32);
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}
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void disassembler::resolve64_mod0(const x86_insn *insn, unsigned mode)
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{
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const char *seg, *rip_regname;
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if (insn->is_seg_override())
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seg = segment_name[insn->seg_override];
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else
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seg = segment_name[DS_REG];
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if (intel_mode) rip_regname = "rip";
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else rip_regname = "%rip";
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if ((insn->rm & 7) == 5) /* no reg, 32-bit displacement */
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print_memory_access64(mode, seg, rip_regname, NULL, 0, (Bit32s) insn->displacement.displ32);
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else
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print_memory_access64(mode, seg, general_64bit_regname[insn->rm], NULL, 0, 0);
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}
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void disassembler::resolve64_mod1or2(const x86_insn *insn, unsigned mode)
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{
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const char *seg;
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if (insn->is_seg_override())
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seg = segment_name[insn->seg_override];
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else
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seg = sreg_mod01or10_rm32[insn->rm];
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print_memory_access64(mode, seg,
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general_64bit_regname[insn->rm], NULL, 0, (Bit32s) insn->displacement.displ32);
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}
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void disassembler::resolve64_mod0_rm4(const x86_insn *insn, unsigned mode)
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{
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const char *seg, *base = NULL, *index = NULL;
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Bit32s disp32 = 0;
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if (insn->is_seg_override())
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seg = segment_name[insn->seg_override];
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else
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seg = sreg_mod00_base32[insn->base];
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if ((insn->base & 7) != 5)
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base = general_64bit_regname[insn->base];
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else
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disp32 = (Bit32s) insn->displacement.displ32;
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if (insn->index != 4)
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index = general_64bit_regname[insn->index];
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print_memory_access64(mode, seg, base, index, insn->scale, disp32);
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}
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void disassembler::resolve64_mod1or2_rm4(const x86_insn *insn, unsigned mode)
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{
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const char *seg, *index = NULL;
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if (insn->is_seg_override())
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seg = segment_name[insn->seg_override];
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else
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seg = sreg_mod01or10_base32[insn->base];
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if (insn->index != 4)
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index = general_64bit_regname[insn->index];
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print_memory_access64(mode, seg,
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general_64bit_regname[insn->base], index, insn->scale, (Bit32s) insn->displacement.displ32);
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}
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void disassembler::print_datasize(unsigned size)
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{
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if (!intel_mode) return;
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switch(size)
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{
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case B_SIZE:
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dis_sprintf("byte ptr ");
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break;
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case W_SIZE:
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dis_sprintf("word ptr ");
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break;
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case D_SIZE:
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dis_sprintf("dword ptr ");
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break;
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case Q_SIZE:
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dis_sprintf("qword ptr ");
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break;
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case O_SIZE:
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dis_sprintf("dqword ptr ");
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break;
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case T_SIZE:
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dis_sprintf("tbyte ptr ");
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break;
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case P_SIZE:
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break;
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case X_SIZE:
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break;
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};
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}
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void disassembler::print_memory_access16(int datasize,
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const char *seg, const char *index, Bit16u disp)
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{
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print_datasize(datasize);
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if (intel_mode)
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{
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if (index == NULL)
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{
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dis_sprintf("%s:0x%x", seg, (unsigned) disp);
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}
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else
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{
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if (disp != 0) {
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if (offset_mode_hex)
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dis_sprintf("%s:[%s+0x%x]", seg, index, (unsigned) disp);
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else
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dis_sprintf("%s:[%s%+d]", seg, index, (int) (Bit16s) disp);
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}
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else
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dis_sprintf("%s:[%s]", seg, index);
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}
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}
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else
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{
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if (index == NULL)
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{
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dis_sprintf("%s:0x%x", seg, (unsigned) disp);
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}
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else
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{
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if (disp != 0) {
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if (offset_mode_hex)
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dis_sprintf("%s:0x%x(%s,1)", seg, (unsigned) disp, index);
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else
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dis_sprintf("%s:%d(%s,1)", seg, (int) (Bit16s) disp, index);
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}
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else
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dis_sprintf("%s:(%s,1)", seg, index);
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}
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}
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}
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void disassembler::print_memory_access32(int datasize,
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const char *seg, const char *base, const char *index, int scale, Bit32s disp)
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{
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print_datasize(datasize);
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scale = 1 << scale;
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if (intel_mode)
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{
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if (base == NULL)
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{
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if (index == NULL)
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{
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dis_sprintf("%s:0x%x", seg, (unsigned) disp);
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}
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else
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{
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if (scale != 1)
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{
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if (disp != 0) {
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if (offset_mode_hex)
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dis_sprintf("%s:[%s*%d+0x%x]", seg, index, scale, (unsigned) disp);
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else
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dis_sprintf("%s:[%s*%d%+d]", seg, index, scale, (int) disp);
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}
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else
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dis_sprintf("%s:[%s*%d]", seg, index, scale);
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}
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else
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{
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if (disp != 0) {
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if (offset_mode_hex)
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dis_sprintf("%s:[%s+0x%x]", seg, index, (unsigned) disp);
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else
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dis_sprintf("%s:[%s%+d]", seg, index, (int) disp);
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}
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else {
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dis_sprintf("%s:[%s]", seg, index);
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}
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}
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}
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}
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else
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{
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if (index == NULL)
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{
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if (disp != 0) {
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if (offset_mode_hex)
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dis_sprintf("%s:[%s+0x%x]", seg, base, (unsigned) disp);
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else
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dis_sprintf("%s:[%s%+d]", seg, base, (int) disp);
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}
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else {
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dis_sprintf("%s:[%s]", seg, base);
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}
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}
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else
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{
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if (scale != 1)
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{
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if (disp != 0) {
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if (offset_mode_hex)
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dis_sprintf("%s:[%s+%s*%d+0x%x]", seg, base, index, scale, (unsigned) disp);
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else
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dis_sprintf("%s:[%s+%s*%d%+d]", seg, base, index, scale, (int) disp);
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}
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else {
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dis_sprintf("%s:[%s+%s*%d]", seg, base, index, scale);
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}
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}
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else
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{
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if (disp != 0) {
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if (offset_mode_hex)
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dis_sprintf("%s:[%s+%s+0x%x]", seg, base, index, (unsigned) disp);
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else
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dis_sprintf("%s:[%s+%s%+d]", seg, base, index, (int) disp);
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}
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else
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dis_sprintf("%s:[%s+%s]", seg, base, index);
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}
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}
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}
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}
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else
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{
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if (base == NULL)
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{
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if (index == NULL)
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{
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dis_sprintf("%s:0x%x", seg, (unsigned) disp);
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}
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else
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{
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if (disp != 0) {
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if (offset_mode_hex)
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dis_sprintf("%s:0x%x(,%s,%d)", seg, (unsigned) disp, index, scale);
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else
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dis_sprintf("%s:%d(,%s,%d)", seg, (int) disp, index, scale);
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}
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else
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dis_sprintf("%s:(,%s,%d)", seg, index, scale);
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}
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}
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else
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{
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if (index == NULL)
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{
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if (disp != 0) {
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if (offset_mode_hex)
|
|
dis_sprintf("%s:0x%x(%s)", seg, (unsigned) disp, base);
|
|
else
|
|
dis_sprintf("%s:%d(%s)", seg, (int) disp, base);
|
|
}
|
|
else
|
|
dis_sprintf("%s:(%s)", seg, base);
|
|
}
|
|
else
|
|
{
|
|
if (disp != 0) {
|
|
if (offset_mode_hex)
|
|
dis_sprintf("%s:0x%x(%s,%s,%d)", seg, (unsigned) disp, base, index, scale);
|
|
else
|
|
dis_sprintf("%s:%d(%s,%s,%d)", seg, (int) disp, base, index, scale);
|
|
}
|
|
else
|
|
dis_sprintf("%s:(%s,%s,%d)", seg, base, index, scale);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void disassembler::print_memory_access64(int datasize,
|
|
const char *seg, const char *base, const char *index, int scale, Bit32s disp)
|
|
{
|
|
Bit64u disp64 = (Bit64s) disp;
|
|
|
|
print_datasize(datasize);
|
|
|
|
scale = 1 << scale;
|
|
|
|
if (intel_mode)
|
|
{
|
|
if (base == NULL)
|
|
{
|
|
if (index == NULL)
|
|
{
|
|
dis_sprintf("%s:0x%08x%08x", seg, GET32H(disp64), GET32L(disp64));
|
|
}
|
|
else
|
|
{
|
|
if (scale != 1)
|
|
{
|
|
if (disp != 0) {
|
|
if (offset_mode_hex)
|
|
dis_sprintf("%s:[%s*%d+0x%08x%08x]", seg, index, scale, GET32H(disp64), GET32L(disp64));
|
|
else
|
|
dis_sprintf("%s:[%s*%d%+d]", seg, index, scale, (int) disp);
|
|
}
|
|
else
|
|
dis_sprintf("%s:[%s*%d]", seg, index, scale);
|
|
}
|
|
else
|
|
{
|
|
if (disp != 0) {
|
|
if (offset_mode_hex)
|
|
dis_sprintf("%s:[%s+0x%08x%08x]", seg, index, GET32H(disp64), GET32L(disp64));
|
|
else
|
|
dis_sprintf("%s:[%s%+d]", seg, index, (int) disp);
|
|
}
|
|
else {
|
|
dis_sprintf("%s:[%s]", seg, index);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (index == NULL)
|
|
{
|
|
if (disp != 0) {
|
|
if (offset_mode_hex)
|
|
dis_sprintf("%s:[%s+0x%08x%08x]", seg, base, GET32H(disp64), GET32L(disp64));
|
|
else
|
|
dis_sprintf("%s:[%s%+d]", seg, base, (int) disp);
|
|
}
|
|
else {
|
|
dis_sprintf("%s:[%s]", seg, base);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (scale != 1)
|
|
{
|
|
if (disp != 0) {
|
|
if (offset_mode_hex)
|
|
dis_sprintf("%s:[%s+%s*%d+0x%08x%08x]", seg, base, index, scale, GET32H(disp64), GET32L(disp64));
|
|
else
|
|
dis_sprintf("%s:[%s+%s*%d%+d]", seg, base, index, scale, (int) disp);
|
|
}
|
|
else {
|
|
dis_sprintf("%s:[%s+%s*%d]", seg, base, index, scale);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (disp != 0) {
|
|
if (offset_mode_hex)
|
|
dis_sprintf("%s:[%s+%s+0x%08x%08x]", seg, base, index, GET32H(disp64), GET32L(disp64));
|
|
else
|
|
dis_sprintf("%s:[%s+%s%+d]", seg, base, index, (int) disp);
|
|
}
|
|
else
|
|
dis_sprintf("%s:[%s+%s]", seg, base, index);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (base == NULL)
|
|
{
|
|
if (index == NULL)
|
|
{
|
|
dis_sprintf("%s:0x%08x%08x", seg, GET32H(disp64), GET32L(disp64));
|
|
}
|
|
else
|
|
{
|
|
if (disp != 0) {
|
|
if (offset_mode_hex)
|
|
dis_sprintf("%s:0x%08x%08x(,%s,%d)", seg, GET32H(disp64), GET32L(disp64), index, scale);
|
|
else
|
|
dis_sprintf("%s:%d(,%s,%d)", seg, (int) disp, index, scale);
|
|
}
|
|
else
|
|
dis_sprintf("%s:(,%s,%d)", seg, index, scale);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (index == NULL)
|
|
{
|
|
if (disp != 0) {
|
|
if (offset_mode_hex)
|
|
dis_sprintf("%s:0x%08x%08x(%s)", seg, GET32H(disp64), GET32L(disp64), base);
|
|
else
|
|
dis_sprintf("%s:%d(%s)", seg, (int) disp, base);
|
|
}
|
|
else
|
|
dis_sprintf("%s:(%s)", seg, base);
|
|
}
|
|
else
|
|
{
|
|
if (disp != 0) {
|
|
if (offset_mode_hex)
|
|
dis_sprintf("%s:0x%08x%08x(%s,%s,%d)", seg, GET32H(disp64), GET32L(disp64), base, index, scale);
|
|
else
|
|
dis_sprintf("%s:%d(%s,%s,%d)", seg, (int) disp, base, index, scale);
|
|
}
|
|
else
|
|
dis_sprintf("%s:(%s,%s,%d)", seg, base, index, scale);
|
|
}
|
|
}
|
|
}
|
|
}
|