53bf5c497f
- Add LICENSES directory - Download additional licenses used - Add .reuse directory - Add doc about SPDX/reuse Co-authored-by: Florian Märkl <info@florianmaerkl.de>
169 lines
3.7 KiB
C
169 lines
3.7 KiB
C
// SPDX-FileCopyrightText: 2017 maijin <maijin21@gmail.com>
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// SPDX-License-Identifier: LGPL-3.0-only
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#include <string.h>
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#include <rz_types.h>
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#include <rz_lib.h>
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#include <rz_asm.h>
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#include <rz_analysis.h>
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static int chip8_anop(RzAnalysis *analysis, RzAnalysisOp *op, ut64 addr, const ut8 *data, int len, RzAnalysisOpMask mask) {
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ut16 opcode = rz_read_be16(data);
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// uint8_t x = (opcode >> 8) & 0x0F;
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// uint8_t y = (opcode >> 4) & 0x0F;
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uint8_t nibble = opcode & 0x0F;
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uint16_t nnn = opcode & 0x0FFF;
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uint8_t kk = opcode & 0xFF;
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op->size = 2;
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op->addr = addr;
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op->type = RZ_ANALYSIS_OP_TYPE_UNK;
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switch (opcode & 0xF000) {
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case 0x0000:
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if (opcode == 0x00EE) {
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op->type = RZ_ANALYSIS_OP_TYPE_RET;
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}
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break;
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case 0x1000:
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op->type = RZ_ANALYSIS_OP_TYPE_JMP;
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op->jump = nnn;
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break;
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case 0x2000:
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op->type = RZ_ANALYSIS_OP_TYPE_CALL;
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op->jump = nnn;
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break;
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case 0x3000:
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op->type = RZ_ANALYSIS_OP_TYPE_RJMP;
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op->jump = addr + op->size * 2;
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op->fail = addr + op->size;
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break;
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case 0x4000:
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op->type = RZ_ANALYSIS_OP_TYPE_RJMP;
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op->jump = addr + op->size * 2;
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op->fail = addr + op->size;
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break;
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case 0x5000:
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op->type = RZ_ANALYSIS_OP_TYPE_RJMP;
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op->jump = addr + op->size * 2;
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op->fail = addr + op->size;
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break;
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case 0x6000:
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op->type = RZ_ANALYSIS_OP_TYPE_MOV;
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break;
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case 0x7000:
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op->type = RZ_ANALYSIS_OP_TYPE_ADD;
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break;
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case 0x8000: {
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switch (nibble) {
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case 0x0:
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op->type = RZ_ANALYSIS_OP_TYPE_MOV;
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break;
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case 0x1:
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op->type = RZ_ANALYSIS_OP_TYPE_OR;
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break;
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case 0x2:
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op->type = RZ_ANALYSIS_OP_TYPE_AND;
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break;
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case 0x3:
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op->type = RZ_ANALYSIS_OP_TYPE_XOR;
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break;
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case 0x4:
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op->type = RZ_ANALYSIS_OP_TYPE_ADD;
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break;
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case 0x5:
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op->type = RZ_ANALYSIS_OP_TYPE_SUB;
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break;
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case 0x6:
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op->type = RZ_ANALYSIS_OP_TYPE_SHR;
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break;
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case 0x7:
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op->type = RZ_ANALYSIS_OP_TYPE_SUB;
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break;
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case 0xE:
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op->type = RZ_ANALYSIS_OP_TYPE_SHL;
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break;
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}
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} break;
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case 0x9000:
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if (nibble == 0) {
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op->type = RZ_ANALYSIS_OP_TYPE_RJMP;
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op->jump = addr + op->size * 2;
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op->fail = addr + op->size;
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}
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break;
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case 0xA000:
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op->type = RZ_ANALYSIS_OP_TYPE_MOV;
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break;
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case 0xB000:
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op->type = RZ_ANALYSIS_OP_TYPE_JMP;
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/* FIXME: this is wrong as op->jump depends on register V0 */
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op->jump = nnn;
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break;
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case 0xE000:
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if (kk == 0x9E || kk == 0xA1) {
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rz_meta_set_string(analysis, RZ_META_TYPE_COMMENT, addr, "KEYPAD");
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op->type = RZ_ANALYSIS_OP_TYPE_CJMP;
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op->jump = addr + op->size * 2;
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op->fail = addr + op->size;
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}
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break;
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case 0xF000: {
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switch (kk) {
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case 0x07:
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op->type = RZ_ANALYSIS_OP_TYPE_MOV;
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break;
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case 0x0A:
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rz_meta_set_string(analysis, RZ_META_TYPE_COMMENT, addr, "KEYPAD");
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op->type = RZ_ANALYSIS_OP_TYPE_MOV;
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break;
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case 0x15:
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op->type = RZ_ANALYSIS_OP_TYPE_MOV;
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break;
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case 0x18:
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op->type = RZ_ANALYSIS_OP_TYPE_MOV;
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break;
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case 0x1E:
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op->type = RZ_ANALYSIS_OP_TYPE_ADD;
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break;
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case 0x29:
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op->type = RZ_ANALYSIS_OP_TYPE_LOAD;
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break;
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case 0x30:
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op->type = RZ_ANALYSIS_OP_TYPE_LOAD;
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break;
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case 0x33:
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op->type = RZ_ANALYSIS_OP_TYPE_STORE;
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break;
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case 0x55:
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op->type = RZ_ANALYSIS_OP_TYPE_STORE;
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break;
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case 0x65:
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op->type = RZ_ANALYSIS_OP_TYPE_LOAD;
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break;
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case 0x75:
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op->type = RZ_ANALYSIS_OP_TYPE_STORE;
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break;
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case 0x85:
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op->type = RZ_ANALYSIS_OP_TYPE_LOAD;
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break;
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}
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} break;
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}
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return op->size;
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}
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RzAnalysisPlugin rz_analysis_plugin_chip8 = {
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.name = "chip8",
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.desc = "CHIP8 analysis plugin",
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.license = "LGPL3",
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.arch = "chip8",
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.bits = 32,
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.op = &chip8_anop,
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};
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#ifndef RZ_PLUGIN_INCORE
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RZ_API RzLibStruct rizin_plugin = {
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.type = RZ_LIB_TYPE_ANALYSIS,
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.data = &rz_analysis_plugin_chip8,
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.version = RZ_VERSION
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};
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#endif
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