a2ec50bf57
This cleans up a bit of the Unwinder code to make it clear what's going on. Modify the offline unit tests to verify the pc and sp to make sure that those values get computed correctly. Test: Passes unit tests. Test: Passes 137-cfi art tests. Change-Id: I0787a1d77b8726d3defd08f31c7476f6798f8d0d
143 lines
4.2 KiB
C++
143 lines
4.2 KiB
C++
/*
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* Copyright (C) 2016 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 <functional>
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#include <unwindstack/Elf.h>
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#include <unwindstack/MachineArm64.h>
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#include <unwindstack/MapInfo.h>
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#include <unwindstack/Memory.h>
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#include <unwindstack/RegsArm64.h>
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#include <unwindstack/UcontextArm64.h>
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#include <unwindstack/UserArm64.h>
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namespace unwindstack {
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RegsArm64::RegsArm64()
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: RegsImpl<uint64_t>(ARM64_REG_LAST, ARM64_REG_SP, Location(LOCATION_REGISTER, ARM64_REG_LR)) {}
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ArchEnum RegsArm64::Arch() {
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return ARCH_ARM64;
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}
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uint64_t RegsArm64::GetPcAdjustment(uint64_t rel_pc, Elf* elf) {
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if (!elf->valid() || rel_pc < 4) {
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return 0;
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}
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return 4;
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}
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void RegsArm64::SetFromRaw() {
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set_pc(regs_[ARM64_REG_PC]);
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set_sp(regs_[ARM64_REG_SP]);
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}
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bool RegsArm64::SetPcFromReturnAddress(Memory*) {
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if (pc() == regs_[ARM64_REG_LR]) {
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return false;
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}
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set_pc(regs_[ARM64_REG_LR]);
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return true;
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}
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void RegsArm64::IterateRegisters(std::function<void(const char*, uint64_t)> fn) {
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fn("x0", regs_[ARM64_REG_R0]);
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fn("x1", regs_[ARM64_REG_R1]);
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fn("x2", regs_[ARM64_REG_R2]);
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fn("x3", regs_[ARM64_REG_R3]);
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fn("x4", regs_[ARM64_REG_R4]);
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fn("x5", regs_[ARM64_REG_R5]);
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fn("x6", regs_[ARM64_REG_R6]);
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fn("x7", regs_[ARM64_REG_R7]);
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fn("x8", regs_[ARM64_REG_R8]);
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fn("x9", regs_[ARM64_REG_R9]);
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fn("x10", regs_[ARM64_REG_R10]);
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fn("x11", regs_[ARM64_REG_R11]);
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fn("x12", regs_[ARM64_REG_R12]);
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fn("x13", regs_[ARM64_REG_R13]);
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fn("x14", regs_[ARM64_REG_R14]);
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fn("x15", regs_[ARM64_REG_R15]);
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fn("x16", regs_[ARM64_REG_R16]);
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fn("x17", regs_[ARM64_REG_R17]);
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fn("x18", regs_[ARM64_REG_R18]);
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fn("x19", regs_[ARM64_REG_R19]);
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fn("x20", regs_[ARM64_REG_R20]);
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fn("x21", regs_[ARM64_REG_R21]);
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fn("x22", regs_[ARM64_REG_R22]);
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fn("x23", regs_[ARM64_REG_R23]);
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fn("x24", regs_[ARM64_REG_R24]);
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fn("x25", regs_[ARM64_REG_R25]);
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fn("x26", regs_[ARM64_REG_R26]);
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fn("x27", regs_[ARM64_REG_R27]);
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fn("x28", regs_[ARM64_REG_R28]);
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fn("x29", regs_[ARM64_REG_R29]);
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fn("sp", regs_[ARM64_REG_SP]);
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fn("lr", regs_[ARM64_REG_LR]);
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fn("pc", regs_[ARM64_REG_PC]);
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}
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Regs* RegsArm64::Read(void* remote_data) {
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arm64_user_regs* user = reinterpret_cast<arm64_user_regs*>(remote_data);
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RegsArm64* regs = new RegsArm64();
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memcpy(regs->RawData(), &user->regs[0], (ARM64_REG_R31 + 1) * sizeof(uint64_t));
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uint64_t* reg_data = reinterpret_cast<uint64_t*>(regs->RawData());
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reg_data[ARM64_REG_PC] = user->pc;
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reg_data[ARM64_REG_SP] = user->sp;
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regs->SetFromRaw();
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return regs;
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}
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Regs* RegsArm64::CreateFromUcontext(void* ucontext) {
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arm64_ucontext_t* arm64_ucontext = reinterpret_cast<arm64_ucontext_t*>(ucontext);
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RegsArm64* regs = new RegsArm64();
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memcpy(regs->RawData(), &arm64_ucontext->uc_mcontext.regs[0], ARM64_REG_LAST * sizeof(uint64_t));
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regs->SetFromRaw();
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return regs;
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}
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bool RegsArm64::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->ReadFully(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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// __kernel_rt_sigreturn:
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// 0xd2801168 mov x8, #0x8b
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// 0xd4000001 svc #0x0
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if (data != 0xd4000001d2801168ULL) {
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return false;
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}
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// SP + sizeof(siginfo_t) + uc_mcontext offset + X0 offset.
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if (!process_memory->ReadFully(sp() + 0x80 + 0xb0 + 0x08, regs_.data(),
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sizeof(uint64_t) * ARM64_REG_LAST)) {
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return false;
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}
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SetFromRaw();
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return true;
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}
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} // namespace unwindstack
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