d06001d6e0
Add an ArchEnum to express the arch of the Elf objects and Reg objects. Split out the regs code into per arch pieces and generic parts. Also, split out the header files for each arch. Do not break out the test code yet, there isn't enough and it doesn't help to maintain the tests. Test: libunwindstack/libbacktrace/debuggerd unit tests pass. Test: Running debuggerd -b <PIDS> yields valid data on bullhead. Change-Id: If61f6c730c9ff2249f986b41de8c4d62f7158325
137 lines
3.9 KiB
C++
137 lines
3.9 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 <elf.h>
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#include <stdint.h>
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#include <unwindstack/Memory.h>
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#include <unwindstack/RegsArm.h>
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#include "ArmExidx.h"
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#include "ElfInterfaceArm.h"
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#include "MachineArm.h"
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namespace unwindstack {
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bool ElfInterfaceArm::FindEntry(uint32_t pc, uint64_t* entry_offset) {
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if (start_offset_ == 0 || total_entries_ == 0) {
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return false;
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}
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size_t first = 0;
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size_t last = total_entries_;
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while (first < last) {
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size_t current = (first + last) / 2;
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uint32_t addr = addrs_[current];
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if (addr == 0) {
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if (!GetPrel31Addr(start_offset_ + current * 8, &addr)) {
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return false;
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}
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addrs_[current] = addr;
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}
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if (pc == addr) {
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*entry_offset = start_offset_ + current * 8;
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return true;
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}
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if (pc < addr) {
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last = current;
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} else {
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first = current + 1;
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}
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}
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if (last != 0) {
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*entry_offset = start_offset_ + (last - 1) * 8;
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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 ElfInterfaceArm::GetPrel31Addr(uint32_t offset, uint32_t* addr) {
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uint32_t data;
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if (!memory_->Read32(offset, &data)) {
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return false;
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}
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// Sign extend the value if necessary.
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int32_t value = (static_cast<int32_t>(data) << 1) >> 1;
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*addr = offset + value;
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return true;
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}
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#if !defined(PT_ARM_EXIDX)
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#define PT_ARM_EXIDX 0x70000001
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#endif
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bool ElfInterfaceArm::HandleType(uint64_t offset, uint32_t type, uint64_t load_bias) {
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if (type != PT_ARM_EXIDX) {
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return false;
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}
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Elf32_Phdr phdr;
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if (!memory_->ReadField(offset, &phdr, &phdr.p_vaddr, sizeof(phdr.p_vaddr))) {
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return true;
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}
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if (!memory_->ReadField(offset, &phdr, &phdr.p_memsz, sizeof(phdr.p_memsz))) {
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return true;
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}
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start_offset_ = phdr.p_vaddr - load_bias;
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total_entries_ = phdr.p_memsz / 8;
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return true;
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}
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bool ElfInterfaceArm::Step(uint64_t pc, Regs* regs, Memory* process_memory, bool* finished) {
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// Dwarf unwind information is precise about whether a pc is covered or not,
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// but arm unwind information only has ranges of pc. In order to avoid
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// incorrectly doing a bad unwind using arm unwind information for a
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// different function, always try and unwind with the dwarf information first.
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return ElfInterface32::Step(pc, regs, process_memory, finished) ||
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StepExidx(pc, regs, process_memory, finished);
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}
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bool ElfInterfaceArm::StepExidx(uint64_t pc, Regs* regs, Memory* process_memory, bool* finished) {
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RegsArm* regs_arm = reinterpret_cast<RegsArm*>(regs);
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uint64_t entry_offset;
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if (!FindEntry(pc, &entry_offset)) {
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return false;
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}
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ArmExidx arm(regs_arm, memory_, process_memory);
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arm.set_cfa(regs_arm->sp());
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bool return_value = false;
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if (arm.ExtractEntryData(entry_offset) && arm.Eval()) {
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// If the pc was not set, then use the LR registers for the PC.
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if (!arm.pc_set()) {
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regs_arm->set_pc((*regs_arm)[ARM_REG_LR]);
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(*regs_arm)[ARM_REG_PC] = regs_arm->pc();
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} else {
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regs_arm->set_pc((*regs_arm)[ARM_REG_PC]);
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}
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regs_arm->set_sp(arm.cfa());
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(*regs_arm)[ARM_REG_SP] = regs_arm->sp();
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return_value = true;
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// If the pc was set to zero, consider this the final frame.
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*finished = (regs_arm->pc() == 0) ? true : false;
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}
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if (arm.status() == ARM_STATUS_NO_UNWIND) {
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*finished = true;
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return true;
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}
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return return_value;
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}
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} // namespace unwindstack
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