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https://github.com/nunuhara/xsystem4.git
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Nunuhara Cabbage
8b77cff70a
Tool for comparing ain files. This is used by the script rtt.sh to ensure that disassembling and then reassembling an ain file produces an equivalent result.
94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
/* Copyright (C) 2019 Nunuhara Cabbage <nunuhara@haniwa.technology>
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*
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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; either version 2 of the License, or
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* (at your option) any later version.
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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://gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include "system4.h"
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#include "system4/ain.h"
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#include "system4/instructions.h"
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#include "little_endian.h"
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#include "dasm.h"
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static const struct instruction *dasm_get_instruction(struct dasm_state *dasm)
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{
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uint16_t opcode = LittleEndian_getW(dasm->ain->code, dasm->addr);
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if (opcode >= NR_OPCODES)
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DASM_ERROR(dasm, "Unknown/invalid opcode: %u", opcode);
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const struct instruction *instr = &instructions[opcode];
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if (dasm->addr + instr->nr_args * 4 >= dasm->ain->code_size)
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DASM_ERROR(dasm, "CODE section truncated?");
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return instr;
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}
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void dasm_init(struct dasm_state *dasm, FILE *out, struct ain *ain, uint32_t flags)
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{
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dasm->out = out;
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dasm->ain = ain;
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dasm->flags = flags;
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dasm->addr = 0;
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dasm->func = -1;
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for (int i = 0; i < DASM_FUNC_STACK_SIZE; i++) {
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dasm->func_stack[i] = -1;
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}
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}
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void dasm_next(struct dasm_state *dasm)
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{
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dasm->addr += instruction_width(dasm->instr->opcode);
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dasm->instr = dasm_eof(dasm) ? &instructions[0] : dasm_get_instruction(dasm);
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}
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enum opcode dasm_peek(struct dasm_state *dasm)
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{
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int width = instruction_width(dasm->instr->opcode);
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if (dasm->addr+width >= dasm->ain->code_size)
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return -1;
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return LittleEndian_getW(dasm->ain->code, dasm->addr+width);
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}
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bool dasm_eof(struct dasm_state *dasm)
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{
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return dasm->addr >= dasm->ain->code_size;
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}
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void dasm_reset(struct dasm_state *dasm)
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{
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dasm->addr = 0;
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dasm->instr = dasm_eof(dasm) ? &instructions[0] : dasm_get_instruction(dasm);
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}
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dasm_save_t dasm_save(struct dasm_state *dasm)
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{
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return (dasm_save_t) { .addr = dasm->addr, .instr = dasm->instr };
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}
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void dasm_restore(struct dasm_state *dasm, dasm_save_t save)
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{
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dasm->addr = save.addr;
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dasm->instr = save.instr;
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}
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int32_t dasm_arg(struct dasm_state *dasm, unsigned int n)
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{
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if ((int)n >= dasm->instr->nr_args)
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return 0;
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return LittleEndian_getDW(dasm->ain->code, dasm->addr + 2 + 4*n);
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}
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