| /* |
| * 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 <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; |
| } |
| |
| uint64_t RegsMips64::GetPcAdjustment(uint64_t rel_pc, Elf*) { |
| if (rel_pc < 8) { |
| return 0; |
| } |
| // For now, just assume no compact branches |
| return 8; |
| } |
| |
| 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) { |
| if (IsDefined(MIPS64_REG_R0)) |
| fn("r0", regs_[MIPS64_REG_R0]); |
| if (IsDefined(MIPS64_REG_R1)) |
| fn("r1", regs_[MIPS64_REG_R1]); |
| if (IsDefined(MIPS64_REG_R2)) |
| fn("r2", regs_[MIPS64_REG_R2]); |
| if (IsDefined(MIPS64_REG_R3)) |
| fn("r3", regs_[MIPS64_REG_R3]); |
| if (IsDefined(MIPS64_REG_R4)) |
| fn("r4", regs_[MIPS64_REG_R4]); |
| if (IsDefined(MIPS64_REG_R5)) |
| fn("r5", regs_[MIPS64_REG_R5]); |
| if (IsDefined(MIPS64_REG_R6)) |
| fn("r6", regs_[MIPS64_REG_R6]); |
| if (IsDefined(MIPS64_REG_R7)) |
| fn("r7", regs_[MIPS64_REG_R7]); |
| if (IsDefined(MIPS64_REG_R8)) |
| fn("r8", regs_[MIPS64_REG_R8]); |
| if (IsDefined(MIPS64_REG_R9)) |
| fn("r9", regs_[MIPS64_REG_R9]); |
| if (IsDefined(MIPS64_REG_R10)) |
| fn("r10", regs_[MIPS64_REG_R10]); |
| if (IsDefined(MIPS64_REG_R11)) |
| fn("r11", regs_[MIPS64_REG_R11]); |
| if (IsDefined(MIPS64_REG_R12)) |
| fn("r12", regs_[MIPS64_REG_R12]); |
| if (IsDefined(MIPS64_REG_R13)) |
| fn("r13", regs_[MIPS64_REG_R13]); |
| if (IsDefined(MIPS64_REG_R14)) |
| fn("r14", regs_[MIPS64_REG_R14]); |
| if (IsDefined(MIPS64_REG_R15)) |
| fn("r15", regs_[MIPS64_REG_R15]); |
| if (IsDefined(MIPS64_REG_R16)) |
| fn("r16", regs_[MIPS64_REG_R16]); |
| if (IsDefined(MIPS64_REG_R17)) |
| fn("r17", regs_[MIPS64_REG_R17]); |
| if (IsDefined(MIPS64_REG_R18)) |
| fn("r18", regs_[MIPS64_REG_R18]); |
| if (IsDefined(MIPS64_REG_R19)) |
| fn("r19", regs_[MIPS64_REG_R19]); |
| if (IsDefined(MIPS64_REG_R20)) |
| fn("r20", regs_[MIPS64_REG_R20]); |
| if (IsDefined(MIPS64_REG_R21)) |
| fn("r21", regs_[MIPS64_REG_R21]); |
| if (IsDefined(MIPS64_REG_R22)) |
| fn("r22", regs_[MIPS64_REG_R22]); |
| if (IsDefined(MIPS64_REG_R23)) |
| fn("r23", regs_[MIPS64_REG_R23]); |
| if (IsDefined(MIPS64_REG_R24)) |
| fn("r24", regs_[MIPS64_REG_R24]); |
| if (IsDefined(MIPS64_REG_R25)) |
| fn("r25", regs_[MIPS64_REG_R25]); |
| if (IsDefined(MIPS64_REG_R26)) |
| fn("r26", regs_[MIPS64_REG_R26]); |
| if (IsDefined(MIPS64_REG_R27)) |
| fn("r27", regs_[MIPS64_REG_R27]); |
| if (IsDefined(MIPS64_REG_R28)) |
| fn("r28", regs_[MIPS64_REG_R28]); |
| if (IsDefined(MIPS64_REG_SP)) |
| fn("sp", regs_[MIPS64_REG_SP]); |
| if (IsDefined(MIPS64_REG_R30)) |
| fn("r30", regs_[MIPS64_REG_R30]); |
| if (IsDefined(MIPS64_REG_RA)) |
| fn("ra", regs_[MIPS64_REG_RA]); |
| if (IsDefined(MIPS64_REG_PC)) |
| 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 rel_pc, 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(rel_pc, &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 |
