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