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/*
* ARM A64 disassembly output wrapper to libvixl
* Copyright (c) 2013 Linaro Limited
* Written by Claudio Fontana
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
extern "C" {
#include "qemu/osdep.h"
#include "disas/dis-asm.h"
}
#include "vixl/a64/disasm-a64.h"
using namespace vixl;
static Decoder *vixl_decoder = NULL;
static Disassembler *vixl_disasm = NULL;
/* We don't use libvixl's PrintDisassembler because its output
* is a little unhelpful (trailing newlines, for example).
* Instead we use our own very similar variant so we have
* control over the format.
*/
class QEMUDisassembler : public Disassembler {
public:
QEMUDisassembler() : printf_(NULL), stream_(NULL) { }
~QEMUDisassembler() { }
void SetStream(FILE *stream) {
stream_ = stream;
}
void SetPrintf(fprintf_function printf_fn) {
printf_ = printf_fn;
}
protected:
virtual void ProcessOutput(const Instruction *instr) {
printf_(stream_, "%08" PRIx32 " %s",
instr->InstructionBits(), GetOutput());
}
private:
fprintf_function printf_;
FILE *stream_;
};
static int vixl_is_initialized(void)
{
return vixl_decoder != NULL;
}
static void vixl_init() {
vixl_decoder = new Decoder();
vixl_disasm = new QEMUDisassembler();
vixl_decoder->AppendVisitor(vixl_disasm);
}
#define INSN_SIZE 4
/* Disassemble ARM A64 instruction. This is our only entry
* point from QEMU's C code.
*/
int print_insn_arm_a64(uint64_t addr, disassemble_info *info)
{
uint8_t bytes[INSN_SIZE];
uint32_t instrval;
const Instruction *instr;
int status;
status = info->read_memory_func(addr, bytes, INSN_SIZE, info);
if (status != 0) {
info->memory_error_func(status, addr, info);
return -1;
}
if (!vixl_is_initialized()) {
vixl_init();
}
((QEMUDisassembler *)vixl_disasm)->SetPrintf(info->fprintf_func);
((QEMUDisassembler *)vixl_disasm)->SetStream(info->stream);
instrval = bytes[0] | bytes[1] << 8 | bytes[2] << 16 | bytes[3] << 24;
instr = reinterpret_cast<const Instruction *>(&instrval);
vixl_disasm->MapCodeAddress(addr, instr);
vixl_decoder->Decode(instr);
return INSN_SIZE;
}
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