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