// Copyright 2017 The Crashpad Authors // // 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 "snapshot/linux/cpu_context_linux.h" #include #include #include #include "base/logging.h" namespace crashpad { namespace internal { #if defined(ARCH_CPU_X86_FAMILY) #define SET_GPRS32() \ do { \ context->eax = thread_context.eax; \ context->ebx = thread_context.ebx; \ context->ecx = thread_context.ecx; \ context->edx = thread_context.edx; \ context->edi = thread_context.edi; \ context->esi = thread_context.esi; \ context->ebp = thread_context.ebp; \ context->esp = thread_context.esp; \ context->eip = thread_context.eip; \ context->eflags = thread_context.eflags; \ context->cs = thread_context.xcs; \ context->ds = thread_context.xds; \ context->es = thread_context.xes; \ context->fs = thread_context.xfs; \ context->gs = thread_context.xgs; \ context->ss = thread_context.xss; \ } while (false) void InitializeCPUContextX86(const ThreadContext::t32_t& thread_context, const FloatContext::f32_t& float_context, CPUContextX86* context) { SET_GPRS32(); static_assert(sizeof(context->fxsave) == sizeof(float_context.fxsave), "fxsave size mismatch"); memcpy(&context->fxsave, &float_context.fxsave, sizeof(context->fxsave)); // TODO(jperaza): debug registers context->dr0 = 0; context->dr1 = 0; context->dr2 = 0; context->dr3 = 0; context->dr4 = 0; context->dr5 = 0; context->dr6 = 0; context->dr7 = 0; } void InitializeCPUContextX86(const SignalThreadContext32& thread_context, const SignalFloatContext32& float_context, CPUContextX86* context) { InitializeCPUContextX86_NoFloatingPoint(thread_context, context); CPUContextX86::FsaveToFxsave(float_context.fsave, &context->fxsave); } void InitializeCPUContextX86_NoFloatingPoint( const SignalThreadContext32& thread_context, CPUContextX86* context) { SET_GPRS32(); memset(&context->fxsave, 0, sizeof(context->fxsave)); context->dr0 = 0; context->dr1 = 0; context->dr2 = 0; context->dr3 = 0; context->dr4 = 0; context->dr5 = 0; context->dr6 = 0; context->dr7 = 0; } #define SET_GPRS64() \ do { \ context->rax = thread_context.rax; \ context->rbx = thread_context.rbx; \ context->rcx = thread_context.rcx; \ context->rdx = thread_context.rdx; \ context->rdi = thread_context.rdi; \ context->rsi = thread_context.rsi; \ context->rbp = thread_context.rbp; \ context->rsp = thread_context.rsp; \ context->r8 = thread_context.r8; \ context->r9 = thread_context.r9; \ context->r10 = thread_context.r10; \ context->r11 = thread_context.r11; \ context->r12 = thread_context.r12; \ context->r13 = thread_context.r13; \ context->r14 = thread_context.r14; \ context->r15 = thread_context.r15; \ context->rip = thread_context.rip; \ context->rflags = thread_context.eflags; \ context->cs = thread_context.cs; \ context->fs = thread_context.fs; \ context->gs = thread_context.gs; \ } while (false) void InitializeCPUContextX86_64(const ThreadContext::t64_t& thread_context, const FloatContext::f64_t& float_context, CPUContextX86_64* context) { SET_GPRS64(); static_assert(sizeof(context->fxsave) == sizeof(float_context.fxsave), "fxsave size mismatch"); memcpy(&context->fxsave, &float_context.fxsave, sizeof(context->fxsave)); // TODO(jperaza): debug registers. context->dr0 = 0; context->dr1 = 0; context->dr2 = 0; context->dr3 = 0; context->dr4 = 0; context->dr5 = 0; context->dr6 = 0; context->dr7 = 0; } void InitializeCPUContextX86_64(const SignalThreadContext64& thread_context, const SignalFloatContext64& float_context, CPUContextX86_64* context) { SET_GPRS64(); static_assert( std::is_same::value, "signal float context has unexpected type"); memcpy(&context->fxsave, &float_context, sizeof(context->fxsave)); context->dr0 = 0; context->dr1 = 0; context->dr2 = 0; context->dr3 = 0; context->dr4 = 0; context->dr5 = 0; context->dr6 = 0; context->dr7 = 0; } void InitializeCPUContextX86_64_NoFloatingPoint( const SignalThreadContext64& thread_context, CPUContextX86_64* context) { SET_GPRS64(); memset(&context->fxsave, 0, sizeof(context->fxsave)); context->dr0 = 0; context->dr1 = 0; context->dr2 = 0; context->dr3 = 0; context->dr4 = 0; context->dr5 = 0; context->dr6 = 0; context->dr7 = 0; } #elif defined(ARCH_CPU_ARM_FAMILY) void InitializeCPUContextARM(const ThreadContext::t32_t& thread_context, const FloatContext::f32_t& float_context, CPUContextARM* context) { static_assert(sizeof(context->regs) == sizeof(thread_context.regs), "registers size mismatch"); memcpy(&context->regs, &thread_context.regs, sizeof(context->regs)); context->fp = thread_context.fp; context->ip = thread_context.ip; context->sp = thread_context.sp; context->lr = thread_context.lr; context->pc = thread_context.pc; context->cpsr = thread_context.cpsr; static_assert(sizeof(context->vfp_regs) == sizeof(float_context.vfp), "vfp size mismatch"); context->have_vfp_regs = float_context.have_vfp; if (float_context.have_vfp) { memcpy(&context->vfp_regs, &float_context.vfp, sizeof(context->vfp_regs)); } static_assert(sizeof(context->fpa_regs) == sizeof(float_context.fpregs), "fpregs size mismatch"); context->have_fpa_regs = float_context.have_fpregs; if (float_context.have_fpregs) { memcpy( &context->fpa_regs, &float_context.fpregs, sizeof(context->fpa_regs)); } } void InitializeCPUContextARM_NoFloatingPoint( const SignalThreadContext32& thread_context, CPUContextARM* context) { static_assert(sizeof(context->regs) == sizeof(thread_context.regs), "registers size mismatch"); memcpy(&context->regs, &thread_context.regs, sizeof(context->regs)); context->fp = thread_context.fp; context->ip = thread_context.ip; context->sp = thread_context.sp; context->lr = thread_context.lr; context->pc = thread_context.pc; context->cpsr = thread_context.cpsr; memset(&context->fpa_regs, 0, sizeof(context->fpa_regs)); memset(&context->vfp_regs, 0, sizeof(context->vfp_regs)); context->have_fpa_regs = false; context->have_vfp_regs = false; } void InitializeCPUContextARM64(const ThreadContext::t64_t& thread_context, const FloatContext::f64_t& float_context, CPUContextARM64* context) { InitializeCPUContextARM64_NoFloatingPoint(thread_context, context); static_assert(sizeof(context->fpsimd) == sizeof(float_context.vregs), "fpsimd context size mismatch"); memcpy(context->fpsimd, float_context.vregs, sizeof(context->fpsimd)); context->fpsr = float_context.fpsr; context->fpcr = float_context.fpcr; } void InitializeCPUContextARM64_NoFloatingPoint( const ThreadContext::t64_t& thread_context, CPUContextARM64* context) { static_assert(sizeof(context->regs) == sizeof(thread_context.regs), "gpr context size mismtach"); memcpy(context->regs, thread_context.regs, sizeof(context->regs)); context->sp = thread_context.sp; context->pc = thread_context.pc; // Linux seems to only be putting the SPSR register in its "pstate" field. // https://elixir.bootlin.com/linux/latest/source/arch/arm64/include/uapi/asm/ptrace.h if (thread_context.pstate > std::numeric_limitsspsr)>::max()) { LOG(WARNING) << "pstate truncation: we only expect the SPSR bits to be set " "in the pstate"; } context->spsr = static_castspsr)>(thread_context.pstate); memset(&context->fpsimd, 0, sizeof(context->fpsimd)); context->fpsr = 0; context->fpcr = 0; } void InitializeCPUContextARM64_OnlyFPSIMD( const SignalFPSIMDContext& float_context, CPUContextARM64* context) { static_assert(sizeof(context->fpsimd) == sizeof(float_context.vregs), "fpsimd context size mismatch"); memcpy(context->fpsimd, float_context.vregs, sizeof(context->fpsimd)); context->fpsr = float_context.fpsr; context->fpcr = float_context.fpcr; } #elif defined(ARCH_CPU_RISCV64) void InitializeCPUContextRISCV64(const ThreadContext::t64_t& thread_context, const FloatContext::f64_t& float_context, CPUContextRISCV64* context) { context->pc = thread_context.pc; static_assert(sizeof(context->regs) == sizeof(thread_context.regs)); memcpy(context->regs, thread_context.regs, sizeof(context->regs)); static_assert(sizeof(context->fpregs) == sizeof(float_context.fpregs)); memcpy(context->fpregs, float_context.fpregs, sizeof(context->fpregs)); context->fcsr = float_context.fcsr; } #endif // ARCH_CPU_X86_FAMILY } // namespace internal } // namespace crashpad