balloon: Don't balloon roms
[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 extern "C" {
21 #include "qemu/osdep.h"
22 #include "disas/bfd.h"
23 }
24
25 #include "vixl/a64/disasm-a64.h"
26
27 using namespace vixl;
28
29 static Decoder *vixl_decoder = NULL;
30 static Disassembler *vixl_disasm = NULL;
31
32 /* We don't use libvixl's PrintDisassembler because its output
33 * is a little unhelpful (trailing newlines, for example).
34 * Instead we use our own very similar variant so we have
35 * control over the format.
36 */
37 class QEMUDisassembler : public Disassembler {
38 public:
39 QEMUDisassembler() : printf_(NULL), stream_(NULL) { }
40 ~QEMUDisassembler() { }
41
42 void SetStream(FILE *stream) {
43 stream_ = stream;
44 }
45
46 void SetPrintf(fprintf_function printf_fn) {
47 printf_ = printf_fn;
48 }
49
50 protected:
51 virtual void ProcessOutput(const Instruction *instr) {
52 printf_(stream_, "%08" PRIx32 " %s",
53 instr->InstructionBits(), GetOutput());
54 }
55
56 private:
57 fprintf_function printf_;
58 FILE *stream_;
59 };
60
61 static int vixl_is_initialized(void)
62 {
63 return vixl_decoder != NULL;
64 }
65
66 static void vixl_init() {
67 vixl_decoder = new Decoder();
68 vixl_disasm = new QEMUDisassembler();
69 vixl_decoder->AppendVisitor(vixl_disasm);
70 }
71
72 #define INSN_SIZE 4
73
74 /* Disassemble ARM A64 instruction. This is our only entry
75 * point from QEMU's C code.
76 */
77 int print_insn_arm_a64(uint64_t addr, disassemble_info *info)
78 {
79 uint8_t bytes[INSN_SIZE];
80 uint32_t instrval;
81 const Instruction *instr;
82 int status;
83
84 status = info->read_memory_func(addr, bytes, INSN_SIZE, info);
85 if (status != 0) {
86 info->memory_error_func(status, addr, info);
87 return -1;
88 }
89
90 if (!vixl_is_initialized()) {
91 vixl_init();
92 }
93
94 ((QEMUDisassembler *)vixl_disasm)->SetPrintf(info->fprintf_func);
95 ((QEMUDisassembler *)vixl_disasm)->SetStream(info->stream);
96
97 instrval = bytes[0] | bytes[1] << 8 | bytes[2] << 16 | bytes[3] << 24;
98 instr = reinterpret_cast<const Instruction *>(&instrval);
99 vixl_disasm->MapCodeAddress(addr, instr);
100 vixl_decoder->Decode(instr);
101
102 return INSN_SIZE;
103 }