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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdint.h>
#include <string.h>
#include <functional>
#include <unwindstack/Elf.h>
#include <unwindstack/MachineX86_64.h>
#include <unwindstack/MapInfo.h>
#include <unwindstack/Memory.h>
#include <unwindstack/RegsX86_64.h>
#include <unwindstack/UcontextX86_64.h>
#include <unwindstack/UserX86_64.h>
namespace unwindstack {
RegsX86_64::RegsX86_64() : RegsImpl<uint64_t>(X86_64_REG_LAST, Location(LOCATION_SP_OFFSET, -8)) {}
ArchEnum RegsX86_64::Arch() {
return ARCH_X86_64;
}
uint64_t RegsX86_64::pc() {
return regs_[X86_64_REG_PC];
}
uint64_t RegsX86_64::sp() {
return regs_[X86_64_REG_SP];
}
void RegsX86_64::set_pc(uint64_t pc) {
regs_[X86_64_REG_PC] = pc;
}
void RegsX86_64::set_sp(uint64_t sp) {
regs_[X86_64_REG_SP] = sp;
}
bool RegsX86_64::SetPcFromReturnAddress(Memory* process_memory) {
// Attempt to get the return address from the top of the stack.
uint64_t new_pc;
if (!process_memory->ReadFully(regs_[X86_64_REG_SP], &new_pc, sizeof(new_pc)) ||
new_pc == regs_[X86_64_REG_PC]) {
return false;
}
regs_[X86_64_REG_PC] = new_pc;
return true;
}
void RegsX86_64::IterateRegisters(std::function<void(const char*, uint64_t)> fn) {
fn("rax", regs_[X86_64_REG_RAX]);
fn("rbx", regs_[X86_64_REG_RBX]);
fn("rcx", regs_[X86_64_REG_RCX]);
fn("rdx", regs_[X86_64_REG_RDX]);
fn("r8", regs_[X86_64_REG_R8]);
fn("r9", regs_[X86_64_REG_R9]);
fn("r10", regs_[X86_64_REG_R10]);
fn("r11", regs_[X86_64_REG_R11]);
fn("r12", regs_[X86_64_REG_R12]);
fn("r13", regs_[X86_64_REG_R13]);
fn("r14", regs_[X86_64_REG_R14]);
fn("r15", regs_[X86_64_REG_R15]);
fn("rdi", regs_[X86_64_REG_RDI]);
fn("rsi", regs_[X86_64_REG_RSI]);
fn("rbp", regs_[X86_64_REG_RBP]);
fn("rsp", regs_[X86_64_REG_RSP]);
fn("rip", regs_[X86_64_REG_RIP]);
}
Regs* RegsX86_64::Read(void* remote_data) {
x86_64_user_regs* user = reinterpret_cast<x86_64_user_regs*>(remote_data);
RegsX86_64* regs = new RegsX86_64();
(*regs)[X86_64_REG_RAX] = user->rax;
(*regs)[X86_64_REG_RBX] = user->rbx;
(*regs)[X86_64_REG_RCX] = user->rcx;
(*regs)[X86_64_REG_RDX] = user->rdx;
(*regs)[X86_64_REG_R8] = user->r8;
(*regs)[X86_64_REG_R9] = user->r9;
(*regs)[X86_64_REG_R10] = user->r10;
(*regs)[X86_64_REG_R11] = user->r11;
(*regs)[X86_64_REG_R12] = user->r12;
(*regs)[X86_64_REG_R13] = user->r13;
(*regs)[X86_64_REG_R14] = user->r14;
(*regs)[X86_64_REG_R15] = user->r15;
(*regs)[X86_64_REG_RDI] = user->rdi;
(*regs)[X86_64_REG_RSI] = user->rsi;
(*regs)[X86_64_REG_RBP] = user->rbp;
(*regs)[X86_64_REG_RSP] = user->rsp;
(*regs)[X86_64_REG_RIP] = user->rip;
return regs;
}
void RegsX86_64::SetFromUcontext(x86_64_ucontext_t* ucontext) {
// R8-R15
memcpy(®s_[X86_64_REG_R8], &ucontext->uc_mcontext.r8, 8 * sizeof(uint64_t));
// Rest of the registers.
regs_[X86_64_REG_RDI] = ucontext->uc_mcontext.rdi;
regs_[X86_64_REG_RSI] = ucontext->uc_mcontext.rsi;
regs_[X86_64_REG_RBP] = ucontext->uc_mcontext.rbp;
regs_[X86_64_REG_RBX] = ucontext->uc_mcontext.rbx;
regs_[X86_64_REG_RDX] = ucontext->uc_mcontext.rdx;
regs_[X86_64_REG_RAX] = ucontext->uc_mcontext.rax;
regs_[X86_64_REG_RCX] = ucontext->uc_mcontext.rcx;
regs_[X86_64_REG_RSP] = ucontext->uc_mcontext.rsp;
regs_[X86_64_REG_RIP] = ucontext->uc_mcontext.rip;
}
Regs* RegsX86_64::CreateFromUcontext(void* ucontext) {
x86_64_ucontext_t* x86_64_ucontext = reinterpret_cast<x86_64_ucontext_t*>(ucontext);
RegsX86_64* regs = new RegsX86_64();
regs->SetFromUcontext(x86_64_ucontext);
return regs;
}
bool RegsX86_64::StepIfSignalHandler(uint64_t elf_offset, Elf* elf, Memory* process_memory) {
uint64_t data;
Memory* elf_memory = elf->memory();
// Read from elf memory since it is usually more expensive to read from
// process memory.
if (!elf_memory->ReadFully(elf_offset, &data, sizeof(data)) || data != 0x0f0000000fc0c748) {
return false;
}
uint16_t data2;
if (!elf_memory->ReadFully(elf_offset + 8, &data2, sizeof(data2)) || data2 != 0x0f05) {
return false;
}
// __restore_rt:
// 0x48 0xc7 0xc0 0x0f 0x00 0x00 0x00 mov $0xf,%rax
// 0x0f 0x05 syscall
// 0x0f nopl 0x0($rax)
// Read the mcontext data from the stack.
// sp points to the ucontext data structure, read only the mcontext part.
x86_64_ucontext_t x86_64_ucontext;
if (!process_memory->ReadFully(regs_[X86_64_REG_SP] + 0x28, &x86_64_ucontext.uc_mcontext,
sizeof(x86_64_mcontext_t))) {
return false;
}
SetFromUcontext(&x86_64_ucontext);
return true;
}
Regs* RegsX86_64::Clone() {
return new RegsX86_64(*this);
}
} // namespace unwindstack
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