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Claudio Fontana999b53e2014-02-05 17:27:28 +00001/*
2 * ARM A64 disassembly output wrapper to libvixl
3 * Copyright (c) 2013 Linaro Limited
4 * Written by Claudio Fontana
5 *
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
Peter Maydelle78490c2016-02-23 11:58:02 +000020#include "qemu/osdep.h"
Markus Armbruster3979fca2019-04-17 21:18:04 +020021#include "disas/dis-asm.h"
Claudio Fontana999b53e2014-02-05 17:27:28 +000022
Peter Maydelle78490c2016-02-23 11:58:02 +000023#include "vixl/a64/disasm-a64.h"
24
Claudio Fontana999b53e2014-02-05 17:27:28 +000025using namespace vixl;
26
27static Decoder *vixl_decoder = NULL;
28static Disassembler *vixl_disasm = NULL;
29
30/* We don't use libvixl's PrintDisassembler because its output
31 * is a little unhelpful (trailing newlines, for example).
32 * Instead we use our own very similar variant so we have
33 * control over the format.
34 */
35class QEMUDisassembler : public Disassembler {
36public:
Peter Crosthwaitefb200d52015-06-23 20:57:34 -070037 QEMUDisassembler() : printf_(NULL), stream_(NULL) { }
Claudio Fontana999b53e2014-02-05 17:27:28 +000038 ~QEMUDisassembler() { }
39
Peter Crosthwaitefb200d52015-06-23 20:57:34 -070040 void SetStream(FILE *stream) {
41 stream_ = stream;
42 }
43
Stefan Weil57b73092015-07-21 11:18:45 +010044 void SetPrintf(fprintf_function printf_fn) {
Peter Crosthwaitefb200d52015-06-23 20:57:34 -070045 printf_ = printf_fn;
46 }
47
Claudio Fontana999b53e2014-02-05 17:27:28 +000048protected:
Peter Maydell6aea44f2014-10-24 12:19:11 +010049 virtual void ProcessOutput(const Instruction *instr) {
Peter Crosthwaitefb200d52015-06-23 20:57:34 -070050 printf_(stream_, "%08" PRIx32 " %s",
Claudio Fontana999b53e2014-02-05 17:27:28 +000051 instr->InstructionBits(), GetOutput());
52 }
53
54private:
Stefan Weil57b73092015-07-21 11:18:45 +010055 fprintf_function printf_;
Claudio Fontana999b53e2014-02-05 17:27:28 +000056 FILE *stream_;
57};
58
59static int vixl_is_initialized(void)
60{
61 return vixl_decoder != NULL;
62}
63
Peter Crosthwaitefb200d52015-06-23 20:57:34 -070064static void vixl_init() {
Claudio Fontana999b53e2014-02-05 17:27:28 +000065 vixl_decoder = new Decoder();
Peter Crosthwaitefb200d52015-06-23 20:57:34 -070066 vixl_disasm = new QEMUDisassembler();
Claudio Fontana999b53e2014-02-05 17:27:28 +000067 vixl_decoder->AppendVisitor(vixl_disasm);
68}
69
70#define INSN_SIZE 4
71
72/* Disassemble ARM A64 instruction. This is our only entry
73 * point from QEMU's C code.
74 */
75int print_insn_arm_a64(uint64_t addr, disassemble_info *info)
76{
77 uint8_t bytes[INSN_SIZE];
Peter Maydell8d298be2015-02-05 13:37:25 +000078 uint32_t instrval;
79 const Instruction *instr;
Claudio Fontana999b53e2014-02-05 17:27:28 +000080 int status;
81
82 status = info->read_memory_func(addr, bytes, INSN_SIZE, info);
83 if (status != 0) {
84 info->memory_error_func(status, addr, info);
85 return -1;
86 }
87
88 if (!vixl_is_initialized()) {
Peter Crosthwaitefb200d52015-06-23 20:57:34 -070089 vixl_init();
Claudio Fontana999b53e2014-02-05 17:27:28 +000090 }
91
Peter Crosthwaitefb200d52015-06-23 20:57:34 -070092 ((QEMUDisassembler *)vixl_disasm)->SetPrintf(info->fprintf_func);
93 ((QEMUDisassembler *)vixl_disasm)->SetStream(info->stream);
94
Peter Maydell8d298be2015-02-05 13:37:25 +000095 instrval = bytes[0] | bytes[1] << 8 | bytes[2] << 16 | bytes[3] << 24;
96 instr = reinterpret_cast<const Instruction *>(&instrval);
97 vixl_disasm->MapCodeAddress(addr, instr);
98 vixl_decoder->Decode(instr);
Claudio Fontana999b53e2014-02-05 17:27:28 +000099
100 return INSN_SIZE;
101}