168 lines
4.9 KiB
C++
168 lines
4.9 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdint.h>
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#include <string.h>
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#include <functional>
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#include <unwindstack/Elf.h>
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#include <unwindstack/MachineMips64.h>
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#include <unwindstack/MapInfo.h>
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#include <unwindstack/Memory.h>
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#include <unwindstack/RegsMips64.h>
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#include <unwindstack/UcontextMips64.h>
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#include <unwindstack/UserMips64.h>
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namespace unwindstack {
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RegsMips64::RegsMips64()
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: RegsImpl<uint64_t>(MIPS64_REG_LAST, Location(LOCATION_REGISTER, MIPS64_REG_RA)) {}
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ArchEnum RegsMips64::Arch() {
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return ARCH_MIPS64;
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}
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uint64_t RegsMips64::pc() {
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return regs_[MIPS64_REG_PC];
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}
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uint64_t RegsMips64::sp() {
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return regs_[MIPS64_REG_SP];
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}
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void RegsMips64::set_pc(uint64_t pc) {
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regs_[MIPS64_REG_PC] = pc;
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}
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void RegsMips64::set_sp(uint64_t sp) {
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regs_[MIPS64_REG_SP] = sp;
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}
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uint64_t RegsMips64::GetPcAdjustment(uint64_t rel_pc, Elf*) {
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if (rel_pc < 8) {
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return 0;
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}
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// For now, just assume no compact branches
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return 8;
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}
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bool RegsMips64::SetPcFromReturnAddress(Memory*) {
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uint64_t ra = regs_[MIPS64_REG_RA];
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if (regs_[MIPS64_REG_PC] == ra) {
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return false;
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}
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regs_[MIPS64_REG_PC] = ra;
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return true;
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}
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void RegsMips64::IterateRegisters(std::function<void(const char*, uint64_t)> fn) {
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fn("r0", regs_[MIPS64_REG_R0]);
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fn("r1", regs_[MIPS64_REG_R1]);
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fn("r2", regs_[MIPS64_REG_R2]);
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fn("r3", regs_[MIPS64_REG_R3]);
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fn("r4", regs_[MIPS64_REG_R4]);
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fn("r5", regs_[MIPS64_REG_R5]);
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fn("r6", regs_[MIPS64_REG_R6]);
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fn("r7", regs_[MIPS64_REG_R7]);
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fn("r8", regs_[MIPS64_REG_R8]);
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fn("r9", regs_[MIPS64_REG_R9]);
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fn("r10", regs_[MIPS64_REG_R10]);
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fn("r11", regs_[MIPS64_REG_R11]);
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fn("r12", regs_[MIPS64_REG_R12]);
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fn("r13", regs_[MIPS64_REG_R13]);
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fn("r14", regs_[MIPS64_REG_R14]);
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fn("r15", regs_[MIPS64_REG_R15]);
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fn("r16", regs_[MIPS64_REG_R16]);
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fn("r17", regs_[MIPS64_REG_R17]);
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fn("r18", regs_[MIPS64_REG_R18]);
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fn("r19", regs_[MIPS64_REG_R19]);
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fn("r20", regs_[MIPS64_REG_R20]);
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fn("r21", regs_[MIPS64_REG_R21]);
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fn("r22", regs_[MIPS64_REG_R22]);
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fn("r23", regs_[MIPS64_REG_R23]);
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fn("r24", regs_[MIPS64_REG_R24]);
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fn("r25", regs_[MIPS64_REG_R25]);
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fn("r26", regs_[MIPS64_REG_R26]);
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fn("r27", regs_[MIPS64_REG_R27]);
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fn("r28", regs_[MIPS64_REG_R28]);
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fn("sp", regs_[MIPS64_REG_SP]);
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fn("r30", regs_[MIPS64_REG_R30]);
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fn("ra", regs_[MIPS64_REG_RA]);
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fn("pc", regs_[MIPS64_REG_PC]);
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}
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Regs* RegsMips64::Read(void* remote_data) {
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mips64_user_regs* user = reinterpret_cast<mips64_user_regs*>(remote_data);
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RegsMips64* regs = new RegsMips64();
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uint64_t* reg_data = reinterpret_cast<uint64_t*>(regs->RawData());
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memcpy(regs->RawData(), &user->regs[MIPS64_EF_R0], (MIPS64_REG_R31 + 1) * sizeof(uint64_t));
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reg_data[MIPS64_REG_PC] = user->regs[MIPS64_EF_CP0_EPC];
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return regs;
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}
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Regs* RegsMips64::CreateFromUcontext(void* ucontext) {
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mips64_ucontext_t* mips64_ucontext = reinterpret_cast<mips64_ucontext_t*>(ucontext);
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RegsMips64* regs = new RegsMips64();
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// Copy 64 bit sc_regs over to 64 bit regs
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memcpy(regs->RawData(), &mips64_ucontext->uc_mcontext.sc_regs[0], 32 * sizeof(uint64_t));
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(*regs)[MIPS64_REG_PC] = mips64_ucontext->uc_mcontext.sc_pc;
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return regs;
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}
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bool RegsMips64::StepIfSignalHandler(uint64_t rel_pc, Elf* elf, Memory* process_memory) {
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uint64_t data;
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Memory* elf_memory = elf->memory();
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// Read from elf memory since it is usually more expensive to read from
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// process memory.
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if (!elf_memory->Read(rel_pc, &data, sizeof(data))) {
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return false;
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}
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// Look for the kernel sigreturn function.
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// __vdso_rt_sigreturn:
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// 0x2402145b li v0, 0x145b
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// 0x0000000c syscall
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if (data != 0x0000000c2402145bULL) {
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return false;
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}
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// vdso_rt_sigreturn => read rt_sigframe
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// offset = siginfo offset + sizeof(siginfo) + uc_mcontext offset
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// read 64 bit sc_regs[32] from stack into 64 bit regs_
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uint64_t sp = regs_[MIPS64_REG_SP];
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if (!process_memory->Read(sp + 24 + 128 + 40, regs_.data(),
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sizeof(uint64_t) * (MIPS64_REG_LAST - 1))) {
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return false;
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}
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// offset = siginfo offset + sizeof(siginfo) + uc_mcontext offset + sc_pc offset
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// read 64 bit sc_pc from stack into 64 bit regs_[MIPS64_REG_PC]
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if (!process_memory->Read(sp + 24 + 128 + 40 + 576, ®s_[MIPS64_REG_PC], sizeof(uint64_t))) {
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return false;
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}
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return true;
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}
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Regs* RegsMips64::Clone() {
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return new RegsMips64(*this);
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}
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} // namespace unwindstack
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