/* * 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 "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; }