324 lines
9.8 KiB
C
324 lines
9.8 KiB
C
/* $Id$ */
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/* Copyright (c) 2011 Pierre Pronchery <khorben@defora.org> */
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/* This file is part of DeforaOS Devel asm */
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/* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3 of the License.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <System.h>
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#include <string.h>
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#include <errno.h>
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/* i386 */
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/* private */
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/* prototypes */
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static int _i386_decode(ArchPlugin * plugin, ArchInstructionCall * call);
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static int _i386_write(ArchPlugin * plugin, ArchInstruction * instruction,
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ArchInstructionCall * call);
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/* functions */
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/* i386_decode */
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static int _i386_decode(ArchPlugin * plugin, ArchInstructionCall * call)
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{
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ArchPluginHelper * helper = plugin->helper;
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ArchInstruction * ai = NULL;
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uint8_t opcode;
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/* FIXME really implement */
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if(helper->read(helper->arch, &opcode, sizeof(opcode))
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!= sizeof(opcode))
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return -1;
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call->operands[0].type = AOT_NONE;
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call->operands[1].type = AOT_NONE;
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call->operands[2].type = AOT_NONE;
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if((ai = helper->get_instruction_by_opcode(helper->arch, 8, opcode))
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== NULL)
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{
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/* FIXME check if it's a longer instruction */
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call->name = "db";
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call->operands[0].type = AO_IMMEDIATE(0, 0, 8);
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call->operands[0].value.immediate.value = opcode;
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return 0;
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}
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call->name = ai->name;
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return 0;
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}
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/* i386_write */
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static int _write_constant(ArchPlugin * plugin,
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ArchOperandDefinition definition, ArchOperand * operand);
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static int _write_dregister(ArchPlugin * plugin, uint32_t * i,
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ArchOperandDefinition * definitions, ArchOperand * operands);
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static int _write_immediate(ArchPlugin * plugin,
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ArchOperandDefinition definition, ArchOperand * operand);
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static int _write_immediate8(ArchPlugin * plugin, uint8_t value);
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static int _write_immediate16(ArchPlugin * plugin, uint16_t value);
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static int _write_immediate24(ArchPlugin * plugin, uint32_t value);
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static int _write_immediate32(ArchPlugin * plugin, uint32_t value);
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static int _write_opcode(ArchPlugin * plugin, ArchInstruction * instruction);
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static int _write_operand(ArchPlugin * plugin, uint32_t * i,
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ArchOperandDefinition * definitions, ArchOperand * operands);
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static int _write_register(ArchPlugin * plugin, uint32_t * i,
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ArchOperandDefinition * definitions, ArchOperand * operands);
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static int _i386_write(ArchPlugin * plugin, ArchInstruction * instruction,
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ArchInstructionCall * call)
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{
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uint32_t i;
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ArchOperandDefinition definitions[3];
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#ifdef DEBUG
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fprintf(stderr, "DEBUG: %s(\"%s\")\n", __func__, instruction->name);
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#endif
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if(_write_opcode(plugin, instruction) != 0)
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return -1;
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definitions[0] = instruction->op1;
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definitions[1] = instruction->op2;
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definitions[2] = instruction->op3;
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for(i = 0; i < call->operands_cnt; i++)
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if(_write_operand(plugin, &i, definitions, call->operands) != 0)
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return -1;
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return 0;
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}
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static int _write_constant(ArchPlugin * plugin,
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ArchOperandDefinition definition, ArchOperand * operand)
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{
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if(AO_GET_FLAGS(definition) & AOF_IMPLICIT)
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return 0;
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definition &= ~(AOM_FLAGS);
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return _write_immediate(plugin, definition, operand);
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}
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static int _write_dregister(ArchPlugin * plugin, uint32_t * i,
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ArchOperandDefinition * definitions, ArchOperand * operands)
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{
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ArchPluginHelper * helper = plugin->helper;
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ArchOperandDefinition definition = definitions[*i];
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ArchOperand * operand = &operands[*i];
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char const * name = operand->value._register.name;
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size_t size = AO_GET_SIZE(definition);
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ArchRegister * ar;
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ArchOperandDefinition idefinition;
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ArchOperand ioperand;
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if((ar = helper->get_register_by_name_size(helper->arch, name, size))
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== NULL)
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return -1;
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/* write register */
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idefinition = AO_IMMEDIATE(0, 0, 8);
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memset(&ioperand, 0, sizeof(ioperand));
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ioperand.type = AOT_IMMEDIATE;
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/* FIXME some combinations of register values are illegal */
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ioperand.value.immediate.value = ar->id;
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if(AO_GET_FLAGS(definition) & AOF_I386_MODRM
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&& AO_GET_VALUE(definition) == 8) /* mod r/m, /r */
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{
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(*i)++; /* skip next operand */
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/* FIXME it could as well be an inverted /r */
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name = operands[*i].value._register.name;
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size = AO_GET_SIZE(definitions[*i]);
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if((ar = helper->get_register_by_name_size(helper->arch, name,
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size)) == NULL)
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return -1;
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ioperand.value.immediate.value |= (ar->id << 3);
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}
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else if(AO_GET_FLAGS(definition) & AOF_I386_MODRM) /* mod r/m, /[0-7] */
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ioperand.value.immediate.value |= (AO_GET_VALUE(definition)
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<< 3);
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if(operand->value.dregister.offset == 0)
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/* there is no offset */
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return _write_immediate(plugin, idefinition, &ioperand);
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/* declare offset */
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switch(AO_GET_OFFSET(definition) >> 3)
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{
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case sizeof(uint8_t):
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ioperand.value.immediate.value |= 0x40;
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break;
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case W >> 3:
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ioperand.value.immediate.value |= 0x80;
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break;
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default:
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return -error_set_code(1, "%s", "Invalid offset");
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}
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if(_write_immediate(plugin, idefinition, &ioperand) != 0)
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return -1;
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/* write offset */
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idefinition = AO_IMMEDIATE(0, 0, AO_GET_OFFSET(definition));
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ioperand.value.immediate.value = operand->value.dregister.offset;
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return _write_immediate(plugin, idefinition, &ioperand);
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}
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static int _write_immediate(ArchPlugin * plugin,
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ArchOperandDefinition definition, ArchOperand * operand)
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{
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uint64_t value = operand->value.immediate.value;
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if((AO_GET_FLAGS(definition) & AOF_SIGNED)
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&& operand->value.immediate.negative != 0)
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value = -value;
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switch(AO_GET_SIZE(definition) >> 3)
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{
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case 0:
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return 0;
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case sizeof(uint8_t):
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return _write_immediate8(plugin, value);
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case sizeof(uint16_t):
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return _write_immediate16(plugin, value);
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case 3:
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return _write_immediate24(plugin, value);
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case sizeof(uint32_t):
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return _write_immediate32(plugin, value);
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}
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return -error_set_code(1, "Invalid size");
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}
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static int _write_immediate8(ArchPlugin * plugin, uint8_t value)
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{
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ArchPluginHelper * helper = plugin->helper;
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if(helper->write(helper->arch, &value, sizeof(value)) != sizeof(value))
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return -1;
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return 0;
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}
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static int _write_immediate16(ArchPlugin * plugin, uint16_t value)
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{
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ArchPluginHelper * helper = plugin->helper;
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value = _htol16(value);
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if(helper->write(helper->arch, &value, sizeof(value)) != sizeof(value))
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return -1;
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return 0;
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}
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static int _write_immediate24(ArchPlugin * plugin, uint32_t value)
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{
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ArchPluginHelper * helper = plugin->helper;
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value = _htol32(value) >> 8;
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if(helper->write(helper->arch, &value, 3) != 3)
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return -1;
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return 0;
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}
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static int _write_immediate32(ArchPlugin * plugin, uint32_t value)
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{
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ArchPluginHelper * helper = plugin->helper;
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value = _htol32(value);
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if(helper->write(helper->arch, &value, sizeof(value)) != sizeof(value))
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return -1;
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return 0;
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}
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static int _write_opcode(ArchPlugin * plugin, ArchInstruction * instruction)
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{
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ArchOperand operand;
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#ifdef DEBUG
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fprintf(stderr, "DEBUG: %s() size=%u opcode=0x%x\n", __func__,
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AO_GET_SIZE(instruction->flags), instruction->opcode);
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#endif
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memset(&operand, 0, sizeof(operand));
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operand.type = AOT_IMMEDIATE;
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switch(AO_GET_SIZE(instruction->flags) >> 3)
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{
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case sizeof(uint8_t):
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operand.value.immediate.value = instruction->opcode;
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break;
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case sizeof(uint16_t):
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operand.value.immediate.value = _htob16(
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instruction->opcode);
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break;
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case 3:
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case sizeof(uint32_t):
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operand.value.immediate.value = _htob32(
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instruction->opcode);
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break;
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default:
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return -error_set_code(1, "%s", "Invalid size");
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}
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return _write_immediate(plugin, instruction->flags, &operand);
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}
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static int _write_operand(ArchPlugin * plugin, uint32_t * i,
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ArchOperandDefinition * definitions, ArchOperand * operands)
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{
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switch(operands[*i].type)
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{
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case AOT_CONSTANT:
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return _write_constant(plugin, definitions[*i],
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&operands[*i]);
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case AOT_DREGISTER:
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return _write_dregister(plugin, i, definitions,
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operands);
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case AOT_IMMEDIATE:
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return _write_immediate(plugin, definitions[*i],
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&operands[*i]);
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case AOT_REGISTER:
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return _write_register(plugin, i, definitions,
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operands);
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case AOT_NONE:
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case AOT_DREGISTER2:
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/* should not happen */
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break;
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}
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return 0;
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}
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static int _write_register(ArchPlugin * plugin, uint32_t * i,
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ArchOperandDefinition * definitions, ArchOperand * operands)
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{
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ArchPluginHelper * helper = plugin->helper;
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ArchOperandDefinition definition = definitions[*i];
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ArchOperand * operand = &operands[*i];
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char const * name = operand->value._register.name;
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size_t size = AO_GET_SIZE(definition);
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ArchRegister * ar;
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ArchOperandDefinition idefinition;
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ArchOperand ioperand;
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if(AO_GET_FLAGS(definition) & AOF_IMPLICIT)
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return 0;
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if((ar = helper->get_register_by_name_size(helper->arch, name, size))
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== NULL)
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return -1;
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/* write register */
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idefinition = AO_IMMEDIATE(0, 0, 8);
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memset(&ioperand, 0, sizeof(ioperand));
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ioperand.type = AOT_IMMEDIATE;
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ioperand.value.immediate.value = ar->id;
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if(AO_GET_FLAGS(definition) & AOF_I386_MODRM
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&& AO_GET_VALUE(definition) == 8) /* mod r/m, /r */
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{
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(*i)++; /* skip next operand */
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/* FIXME it could as well be an inverted /r */
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name = operands[*i].value._register.name;
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size = AO_GET_SIZE(definitions[*i]);
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if((ar = helper->get_register_by_name_size(helper->arch, name,
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size)) == NULL)
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return -1;
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ioperand.value.immediate.value |= 0xc0 | (ar->id << 3);
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}
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else if(AO_GET_FLAGS(definition) & AOF_I386_MODRM) /* mod r/m, /[0-7] */
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ioperand.value.immediate.value = 0xc0 | ar->id
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| (AO_GET_VALUE(definition) << 3);
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else
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ioperand.value.immediate.value = ar->id;
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return _write_immediate(plugin, idefinition, &ioperand);
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}
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