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/*
* Copyright (C) 2022 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/MachineRiscv64.h>
#include <unwindstack/MapInfo.h>
#include <unwindstack/Memory.h>
#include <unwindstack/RegsRiscv64.h>
#include <unwindstack/UcontextRiscv64.h>
#include <unwindstack/UserRiscv64.h>
namespace unwindstack {
RegsRiscv64::RegsRiscv64()
: RegsImpl<uint64_t>(RISCV64_REG_MAX, Location(LOCATION_REGISTER, RISCV64_REG_RA)) {}
ArchEnum RegsRiscv64::Arch() {
return ARCH_RISCV64;
}
uint64_t RegsRiscv64::pc() {
return regs_[RISCV64_REG_PC];
}
uint64_t RegsRiscv64::sp() {
return regs_[RISCV64_REG_SP];
}
void RegsRiscv64::set_pc(uint64_t pc) {
regs_[RISCV64_REG_PC] = pc;
}
void RegsRiscv64::set_sp(uint64_t sp) {
regs_[RISCV64_REG_SP] = sp;
}
uint64_t RegsRiscv64::GetPcAdjustment(uint64_t rel_pc, Elf*) {
if (rel_pc < 8) {
return 0;
}
// For now, just assume no compact branches
return 8;
}
bool RegsRiscv64::SetPcFromReturnAddress(Memory*) {
uint64_t ra = regs_[RISCV64_REG_RA];
if (regs_[RISCV64_REG_PC] == ra) {
return false;
}
regs_[RISCV64_REG_PC] = ra;
return true;
}
void RegsRiscv64::IterateRegisters(std::function<void(const char*, uint64_t)> fn) {
fn("pc", regs_[RISCV64_REG_PC]);
fn("ra", regs_[RISCV64_REG_RA]);
fn("sp", regs_[RISCV64_REG_SP]);
fn("gp", regs_[RISCV64_REG_GP]);
fn("tp", regs_[RISCV64_REG_TP]);
fn("t0", regs_[RISCV64_REG_T0]);
fn("t1", regs_[RISCV64_REG_T1]);
fn("t2", regs_[RISCV64_REG_T2]);
fn("t3", regs_[RISCV64_REG_T3]);
fn("t4", regs_[RISCV64_REG_T4]);
fn("t5", regs_[RISCV64_REG_T5]);
fn("t6", regs_[RISCV64_REG_T6]);
fn("s0", regs_[RISCV64_REG_S0]);
fn("s1", regs_[RISCV64_REG_S1]);
fn("s2", regs_[RISCV64_REG_S2]);
fn("s3", regs_[RISCV64_REG_S3]);
fn("s4", regs_[RISCV64_REG_S4]);
fn("s5", regs_[RISCV64_REG_S5]);
fn("s6", regs_[RISCV64_REG_S6]);
fn("s7", regs_[RISCV64_REG_S7]);
fn("s8", regs_[RISCV64_REG_S8]);
fn("s9", regs_[RISCV64_REG_S9]);
fn("s10", regs_[RISCV64_REG_S10]);
fn("s11", regs_[RISCV64_REG_S11]);
fn("a0", regs_[RISCV64_REG_A0]);
fn("a1", regs_[RISCV64_REG_A1]);
fn("a2", regs_[RISCV64_REG_A2]);
fn("a3", regs_[RISCV64_REG_A3]);
fn("a4", regs_[RISCV64_REG_A4]);
fn("a5", regs_[RISCV64_REG_A5]);
fn("a6", regs_[RISCV64_REG_A6]);
fn("a7", regs_[RISCV64_REG_A7]);
}
Regs* RegsRiscv64::Read(void* remote_data) {
riscv64_user_regs* user = reinterpret_cast<riscv64_user_regs*>(remote_data);
RegsRiscv64* regs = new RegsRiscv64();
memcpy(regs->RawData(), &user->regs[0], RISCV64_REG_MAX * sizeof(uint64_t));
// uint64_t* reg_data = reinterpret_cast<uint64_t*>(regs->RawData());
return regs;
}
Regs* RegsRiscv64::CreateFromUcontext(void* ucontext) {
riscv64_ucontext_t* riscv64_ucontext = reinterpret_cast<riscv64_ucontext_t*>(ucontext);
RegsRiscv64* regs = new RegsRiscv64();
memcpy(regs->RawData(), &riscv64_ucontext->uc_mcontext.__gregs[0],
RISCV64_REG_MAX * sizeof(uint64_t));
return regs;
}
bool RegsRiscv64::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))) {
return false;
}
// Look for the kernel sigreturn function.
// __kernel_rt_sigreturn:
// li a7, __NR_rt_sigreturn
// scall
const uint8_t li_scall[] = {0x93, 0x08, 0xb0, 0x08, 0x73, 0x00, 0x00, 0x00};
if (memcmp(&data, &li_scall, 8) != 0) {
return false;
}
// SP + sizeof(siginfo_t) + uc_mcontext offset + PC offset.
if (!process_memory->ReadFully(regs_[RISCV64_REG_SP] + 0x80 + 0xb0 + 0x00, regs_.data(),
sizeof(uint64_t) * (RISCV64_REG_MAX))) {
return false;
}
return true;
}
Regs* RegsRiscv64::Clone() {
return new RegsRiscv64(*this);
}
} // namespace unwindstack
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