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/*
* Copyright (C) 2017 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/MachineMips64.h>
#include <unwindstack/MapInfo.h>
#include <unwindstack/Memory.h>
#include <unwindstack/RegsMips64.h>
#include <unwindstack/UcontextMips64.h>
#include <unwindstack/UserMips64.h>
namespace unwindstack {
RegsMips64::RegsMips64()
: RegsImpl<uint64_t>(MIPS64_REG_LAST, Location(LOCATION_REGISTER, MIPS64_REG_RA)) {}
ArchEnum RegsMips64::Arch() {
return ARCH_MIPS64;
}
uint64_t RegsMips64::pc() {
return regs_[MIPS64_REG_PC];
}
uint64_t RegsMips64::sp() {
return regs_[MIPS64_REG_SP];
}
void RegsMips64::set_pc(uint64_t pc) {
regs_[MIPS64_REG_PC] = pc;
}
void RegsMips64::set_sp(uint64_t sp) {
regs_[MIPS64_REG_SP] = sp;
}
bool RegsMips64::SetPcFromReturnAddress(Memory*) {
uint64_t ra = regs_[MIPS64_REG_RA];
if (regs_[MIPS64_REG_PC] == ra) {
return false;
}
regs_[MIPS64_REG_PC] = ra;
return true;
}
void RegsMips64::IterateRegisters(std::function<void(const char*, uint64_t)> fn) {
fn("r0", regs_[MIPS64_REG_R0]);
fn("r1", regs_[MIPS64_REG_R1]);
fn("r2", regs_[MIPS64_REG_R2]);
fn("r3", regs_[MIPS64_REG_R3]);
fn("r4", regs_[MIPS64_REG_R4]);
fn("r5", regs_[MIPS64_REG_R5]);
fn("r6", regs_[MIPS64_REG_R6]);
fn("r7", regs_[MIPS64_REG_R7]);
fn("r8", regs_[MIPS64_REG_R8]);
fn("r9", regs_[MIPS64_REG_R9]);
fn("r10", regs_[MIPS64_REG_R10]);
fn("r11", regs_[MIPS64_REG_R11]);
fn("r12", regs_[MIPS64_REG_R12]);
fn("r13", regs_[MIPS64_REG_R13]);
fn("r14", regs_[MIPS64_REG_R14]);
fn("r15", regs_[MIPS64_REG_R15]);
fn("r16", regs_[MIPS64_REG_R16]);
fn("r17", regs_[MIPS64_REG_R17]);
fn("r18", regs_[MIPS64_REG_R18]);
fn("r19", regs_[MIPS64_REG_R19]);
fn("r20", regs_[MIPS64_REG_R20]);
fn("r21", regs_[MIPS64_REG_R21]);
fn("r22", regs_[MIPS64_REG_R22]);
fn("r23", regs_[MIPS64_REG_R23]);
fn("r24", regs_[MIPS64_REG_R24]);
fn("r25", regs_[MIPS64_REG_R25]);
fn("r26", regs_[MIPS64_REG_R26]);
fn("r27", regs_[MIPS64_REG_R27]);
fn("r28", regs_[MIPS64_REG_R28]);
fn("sp", regs_[MIPS64_REG_SP]);
fn("r30", regs_[MIPS64_REG_R30]);
fn("ra", regs_[MIPS64_REG_RA]);
fn("pc", regs_[MIPS64_REG_PC]);
}
Regs* RegsMips64::Read(void* remote_data) {
mips64_user_regs* user = reinterpret_cast<mips64_user_regs*>(remote_data);
RegsMips64* regs = new RegsMips64();
uint64_t* reg_data = reinterpret_cast<uint64_t*>(regs->RawData());
memcpy(regs->RawData(), &user->regs[MIPS64_EF_R0], (MIPS64_REG_R31 + 1) * sizeof(uint64_t));
reg_data[MIPS64_REG_PC] = user->regs[MIPS64_EF_CP0_EPC];
return regs;
}
Regs* RegsMips64::CreateFromUcontext(void* ucontext) {
mips64_ucontext_t* mips64_ucontext = reinterpret_cast<mips64_ucontext_t*>(ucontext);
RegsMips64* regs = new RegsMips64();
// Copy 64 bit sc_regs over to 64 bit regs
memcpy(regs->RawData(), &mips64_ucontext->uc_mcontext.sc_regs[0], 32 * sizeof(uint64_t));
(*regs)[MIPS64_REG_PC] = mips64_ucontext->uc_mcontext.sc_pc;
return regs;
}
bool RegsMips64::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->Read(elf_offset, &data, sizeof(data))) {
return false;
}
// Look for the kernel sigreturn function.
// __vdso_rt_sigreturn:
// 0x2402145b li v0, 0x145b
// 0x0000000c syscall
if (data != 0x0000000c2402145bULL) {
return false;
}
// vdso_rt_sigreturn => read rt_sigframe
// offset = siginfo offset + sizeof(siginfo) + uc_mcontext offset
// read 64 bit sc_regs[32] from stack into 64 bit regs_
uint64_t sp = regs_[MIPS64_REG_SP];
if (!process_memory->Read(sp + 24 + 128 + 40, regs_.data(),
sizeof(uint64_t) * (MIPS64_REG_LAST - 1))) {
return false;
}
// offset = siginfo offset + sizeof(siginfo) + uc_mcontext offset + sc_pc offset
// read 64 bit sc_pc from stack into 64 bit regs_[MIPS64_REG_PC]
if (!process_memory->Read(sp + 24 + 128 + 40 + 576, ®s_[MIPS64_REG_PC], sizeof(uint64_t))) {
return false;
}
return true;
}
Regs* RegsMips64::Clone() {
return new RegsMips64(*this);
}
} // namespace unwindstack
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