219 lines
6.2 KiB
C++
219 lines
6.2 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 <string.h>
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#include <functional>
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#ifdef SENTRY_REMOVED
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#if defined(__BIONIC__)
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#include <bionic/pac.h>
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#endif
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#endif // SENTRY_REMOVED
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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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ResetPseudoRegisters();
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pac_mask_ = 0;
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}
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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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static uint64_t strip_pac(uint64_t pc, uint64_t mask) {
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// If the target is aarch64 then the return address may have been
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// signed using the Armv8.3-A Pointer Authentication extension. The
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// original return address can be restored by stripping out the
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// authentication code using a mask or xpaclri. xpaclri is a NOP on
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// pre-Armv8.3-A architectures.
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if (mask) {
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pc &= ~mask;
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} else {
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#ifdef SENTRY_REMOVED
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#if defined(__BIONIC__)
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pc = __bionic_clear_pac_bits(pc);
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#endif
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#endif // SENTRY_REMOVED
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}
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return pc;
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}
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void RegsArm64::set_pc(uint64_t pc) {
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if ((0 != pc) && IsRASigned()) {
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pc = strip_pac(pc, pac_mask_);
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}
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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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void RegsArm64::fallback_pc() {
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// As a last resort, try stripping the PC of the pointer
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// authentication code.
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regs_[ARM64_REG_PC] = strip_pac(regs_[ARM64_REG_PC], pac_mask_);
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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("lr", regs_[ARM64_REG_LR]);
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fn("sp", regs_[ARM64_REG_SP]);
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fn("pc", regs_[ARM64_REG_PC]);
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fn("pst", regs_[ARM64_REG_PSTATE]);
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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_R30 + 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_SP] = user->sp;
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reg_data[ARM64_REG_PC] = user->pc;
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reg_data[ARM64_REG_PSTATE] = user->pstate;
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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 elf_offset, 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(elf_offset, &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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void RegsArm64::ResetPseudoRegisters(void) {
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// DWARF for AArch64 says RA_SIGN_STATE should be initialized to 0.
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this->SetPseudoRegister(Arm64Reg::ARM64_PREG_RA_SIGN_STATE, 0);
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}
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bool RegsArm64::SetPseudoRegister(uint16_t id, uint64_t value) {
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if ((id >= Arm64Reg::ARM64_PREG_FIRST) && (id < Arm64Reg::ARM64_PREG_LAST)) {
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pseudo_regs_[id - Arm64Reg::ARM64_PREG_FIRST] = value;
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return true;
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}
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return false;
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}
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bool RegsArm64::GetPseudoRegister(uint16_t id, uint64_t* value) {
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if ((id >= Arm64Reg::ARM64_PREG_FIRST) && (id < Arm64Reg::ARM64_PREG_LAST)) {
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*value = pseudo_regs_[id - Arm64Reg::ARM64_PREG_FIRST];
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return true;
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}
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return false;
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}
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bool RegsArm64::IsRASigned() {
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uint64_t value;
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auto result = this->GetPseudoRegister(Arm64Reg::ARM64_PREG_RA_SIGN_STATE, &value);
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return (result && (value != 0));
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}
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void RegsArm64::SetPACMask(uint64_t mask) {
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pac_mask_ = mask;
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}
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Regs* RegsArm64::Clone() {
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return new RegsArm64(*this);
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}
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} // namespace unwindstack
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