qemu/disas/arm-a64.cc
Peter Maydell 6aea44fc2b disas/libvixl: Update to libvixl 1.6
Update our copy of libvixl to upstream 1.6. There are no
changes of any particular interest to QEMU, so this is simply
keeping up with current upstream.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1412091418-25744-1-git-send-email-peter.maydell@linaro.org
2014-10-24 12:19:11 +01:00

88 lines
2.3 KiB
C++

/*
* 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/>.
*/
#include "a64/disasm-a64.h"
extern "C" {
#include "disas/bfd.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:
explicit QEMUDisassembler(FILE *stream) : stream_(stream) { }
~QEMUDisassembler() { }
protected:
virtual void ProcessOutput(const Instruction *instr) {
fprintf(stream_, "%08" PRIx32 " %s",
instr->InstructionBits(), GetOutput());
}
private:
FILE *stream_;
};
static int vixl_is_initialized(void)
{
return vixl_decoder != NULL;
}
static void vixl_init(FILE *f) {
vixl_decoder = new Decoder();
vixl_disasm = new QEMUDisassembler(f);
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 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(info->stream);
}
instr = bytes[0] | bytes[1] << 8 | bytes[2] << 16 | bytes[3] << 24;
vixl_decoder->Decode(reinterpret_cast<Instruction*>(&instr));
return INSN_SIZE;
}