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135 lines
4.6 KiB
135 lines
4.6 KiB
// Copyright 2020, VIXL authors
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of ARM Limited nor the names of its contributors may be
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// used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
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// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "code-buffer-vixl.h"
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#include "aarch64/decoder-aarch64.h"
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#include "aarch64/disasm-aarch64.h"
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// This example is interactive, and isn't tested systematically.
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#ifndef TEST_EXAMPLES
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using namespace vixl;
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using namespace vixl::aarch64;
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void PrintUsage(char const* name) {
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printf("Usage: %s [OPTION]... <INSTRUCTION>...\n", name);
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printf("\n");
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printf("Disassemble ad-hoc A64 instructions.\n");
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printf("\n");
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printf(
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"Options:\n"
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" --start-at <address>\n"
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" Start disassembling from <address> Any signed 64-bit value\n"
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" accepted by strtoll can be specified. The address is printed\n"
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" alongside each instruction, and it is also used to decode\n"
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" PC-relative offsets.\n"
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"\n"
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" Defaults to 0.\n"
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"\n");
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printf(
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"<instruction>\n"
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" A hexadecimal representation of an A64 instruction. The leading '0x'\n"
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" (or '0X') is optional.\n"
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"\n"
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" Multiple instructions can be provided; they will be disassembled as\n"
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" if they were read sequentially from memory.\n"
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"\n");
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printf("Examples:\n");
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printf(" $ %s d2824685\n", name);
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printf(" 0x0000000000000000: d2824685 movz x5, #0x1234\n");
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printf("\n");
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printf(" $ %s --start-at -4 0x10fffe85 0xd61f00a0\n", name);
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printf(" -0x0000000000000004: 10fffe85 adr x5, #-0x30 (addr -0x34)\n");
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printf(" 0x0000000000000000: d61f00a0 br x5\n");
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}
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Instr ParseInstr(char const* arg) {
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// TODO: Error handling for out-of-range inputs.
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return (Instr)strtoul(arg, NULL, 16);
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}
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int64_t ParseInt64(char const* arg) {
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// TODO: Error handling for out-of-range inputs.
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return (int64_t)strtoll(arg, NULL, 0);
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}
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int main(int argc, char* argv[]) {
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for (int i = 1; i < argc; i++) {
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char const* arg = argv[i];
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if ((strcmp(arg, "--help") == 0) || (strcmp(arg, "-h") == 0)) {
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PrintUsage(argv[0]);
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return 0;
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}
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}
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// Assume an address of 0, unless otherwise specified.
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int64_t start_address = 0;
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// Allocate space for one instruction per argument.
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CodeBuffer buffer((argc - 1) * kInstructionSize);
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bool expect_start_at = false;
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for (int i = 1; i < argc; i++) {
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char* arg = argv[i];
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if (expect_start_at) {
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start_address = ParseInt64(arg);
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expect_start_at = false;
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} else if (strcmp(arg, "--start-at") == 0) {
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expect_start_at = true;
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} else {
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// Assume that everything else is an instruction.
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buffer.Emit(ParseInstr(arg));
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}
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}
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buffer.SetClean();
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if (expect_start_at) {
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printf("No address given. Use: --start-at <address>\n");
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return 1;
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}
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if (buffer.GetSizeInBytes() == 0) {
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printf("Nothing to disassemble.\n");
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return 0;
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}
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// Disassemble the buffer.
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const Instruction* start = buffer.GetStartAddress<Instruction*>();
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const Instruction* end = buffer.GetEndAddress<Instruction*>();
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vixl::aarch64::PrintDisassembler disasm(stdout);
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disasm.PrintSignedAddresses(true);
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disasm.MapCodeAddress(start_address, start);
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disasm.DisassembleBuffer(start, end);
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return 0;
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}
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#endif // TEST_EXAMPLES
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