6dbc28ece3
Fix RegsArm::GetPcAdjustment to check for an invalid elf before trying to read memory. Modify the tests for this so it crashes without this change. Also modify the GetPcAdjustment for all different architectures so that unless the relative pc is too small, it will return the minimum amount that should be adjusted. This is to handle cases where we still want to adjust the pc but it's in an invalid elf. Mostly this is for handling cases when the pc is in jit gdb debug code so that we use the right unwind information. Bug: 77233204 Test: Passes unit tests for libbacktrace/libunwindstack. Change-Id: Id73609adaf3b80a583584441de228156fec3afa7
151 lines
4.3 KiB
C++
151 lines
4.3 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, 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::pc() {
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return regs_[ARM64_REG_PC];
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}
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uint64_t RegsArm64::sp() {
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return regs_[ARM64_REG_SP];
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}
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void RegsArm64::set_pc(uint64_t pc) {
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regs_[ARM64_REG_PC] = pc;
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}
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void RegsArm64::set_sp(uint64_t sp) {
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regs_[ARM64_REG_SP] = sp;
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}
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uint64_t RegsArm64::GetPcAdjustment(uint64_t rel_pc, Elf*) {
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if (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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bool RegsArm64::SetPcFromReturnAddress(Memory*) {
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uint64_t lr = regs_[ARM64_REG_LR];
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if (regs_[ARM64_REG_PC] == lr) {
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return false;
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}
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regs_[ARM64_REG_PC] = 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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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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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(regs_[ARM64_REG_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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return true;
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}
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} // namespace unwindstack
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