Merge remote-tracking branch 'mreitz/block' into queue-block
[qemu.git] / disas / arm-a64.cc
1 /*
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
20 #include "a64/disasm-a64.h"
21
22 extern "C" {
23 #include "disas/bfd.h"
24 }
25
26 using namespace vixl;
27
28 static Decoder *vixl_decoder = NULL;
29 static Disassembler *vixl_disasm = NULL;
30
31 /* We don't use libvixl's PrintDisassembler because its output
32 * is a little unhelpful (trailing newlines, for example).
33 * Instead we use our own very similar variant so we have
34 * control over the format.
35 */
36 class QEMUDisassembler : public Disassembler {
37 public:
38 explicit QEMUDisassembler(FILE *stream) : stream_(stream) { }
39 ~QEMUDisassembler() { }
40
41 protected:
42 virtual void ProcessOutput(const Instruction *instr) {
43 fprintf(stream_, "%08" PRIx32 " %s",
44 instr->InstructionBits(), GetOutput());
45 }
46
47 private:
48 FILE *stream_;
49 };
50
51 static int vixl_is_initialized(void)
52 {
53 return vixl_decoder != NULL;
54 }
55
56 static void vixl_init(FILE *f) {
57 vixl_decoder = new Decoder();
58 vixl_disasm = new QEMUDisassembler(f);
59 vixl_decoder->AppendVisitor(vixl_disasm);
60 }
61
62 #define INSN_SIZE 4
63
64 /* Disassemble ARM A64 instruction. This is our only entry
65 * point from QEMU's C code.
66 */
67 int print_insn_arm_a64(uint64_t addr, disassemble_info *info)
68 {
69 uint8_t bytes[INSN_SIZE];
70 uint32_t instr;
71 int status;
72
73 status = info->read_memory_func(addr, bytes, INSN_SIZE, info);
74 if (status != 0) {
75 info->memory_error_func(status, addr, info);
76 return -1;
77 }
78
79 if (!vixl_is_initialized()) {
80 vixl_init(info->stream);
81 }
82
83 instr = bytes[0] | bytes[1] << 8 | bytes[2] << 16 | bytes[3] << 24;
84 vixl_decoder->Decode(reinterpret_cast<Instruction*>(&instr));
85
86 return INSN_SIZE;
87 }