/* * 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) { 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 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