435 lines
9.9 KiB
C++
435 lines
9.9 KiB
C++
// Copyright 2017 The Crashpad Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef CRASHPAD_SNAPSHOT_LINUX_SNAPSHOT_SIGNAL_CONTEXT_H_
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#define CRASHPAD_SNAPSHOT_LINUX_SNAPSHOT_SIGNAL_CONTEXT_H_
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#include <signal.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <sys/ucontext.h>
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#include <cstddef>
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#include <type_traits>
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#include "build/build_config.h"
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#include "util/linux/thread_info.h"
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#include "util/linux/traits.h"
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namespace crashpad {
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namespace internal {
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#pragma pack(push, 1)
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template <class Traits>
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union Sigval {
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int32_t sigval;
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typename Traits::Address pointer;
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};
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template <class Traits>
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struct Siginfo {
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int32_t signo;
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#ifdef ARCH_CPU_MIPS_FAMILY
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// Attribute order for signo_t defined in kernel is different for MIPS.
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int32_t code;
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int32_t err;
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#else
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int32_t err;
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int32_t code;
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#endif
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typename Traits::UInteger32_64Only padding;
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union {
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// SIGSEGV, SIGILL, SIGFPE, SIGBUS, SIGTRAP
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struct {
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typename Traits::Address address;
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};
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// SIGPOLL
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struct {
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typename Traits::Long band;
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int32_t fd;
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};
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// SIGSYS
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struct {
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typename Traits::Address call_address;
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int32_t syscall;
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uint32_t arch;
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};
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// Everything else
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struct {
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union {
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struct {
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pid_t pid;
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uid_t uid;
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};
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struct {
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int32_t timerid;
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int32_t overrun;
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};
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};
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union {
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Sigval<Traits> sigval;
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// SIGCHLD
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struct {
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int32_t status;
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typename Traits::Clock utime;
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typename Traits::Clock stime;
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};
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};
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};
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};
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};
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template <typename Traits>
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struct SignalStack {
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typename Traits::Address stack_pointer;
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uint32_t flags;
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typename Traits::UInteger32_64Only padding;
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typename Traits::Size size;
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};
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template <typename Traits, typename Enable = void>
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struct Sigset {};
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template <typename Traits>
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struct Sigset<
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Traits,
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typename std::enable_if<std::is_base_of<Traits32, Traits>::value>::type> {
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uint64_t val;
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};
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template <typename Traits>
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struct Sigset<
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Traits,
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typename std::enable_if<std::is_base_of<Traits64, Traits>::value>::type> {
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#if BUILDFLAG(IS_ANDROID)
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uint64_t val;
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#else
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typename Traits::ULong val[16];
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#endif // BUILDFLAG(IS_ANDROID)
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};
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#if defined(ARCH_CPU_X86_FAMILY)
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struct SignalThreadContext32 {
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uint32_t xgs;
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uint32_t xfs;
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uint32_t xes;
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uint32_t xds;
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uint32_t edi;
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uint32_t esi;
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uint32_t ebp;
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uint32_t esp;
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uint32_t ebx;
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uint32_t edx;
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uint32_t ecx;
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uint32_t eax;
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uint32_t trapno;
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uint32_t err;
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uint32_t eip;
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uint32_t xcs;
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uint32_t eflags;
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uint32_t uesp;
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uint32_t xss;
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};
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struct SignalThreadContext64 {
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uint64_t r8;
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uint64_t r9;
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uint64_t r10;
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uint64_t r11;
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uint64_t r12;
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uint64_t r13;
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uint64_t r14;
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uint64_t r15;
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uint64_t rdi;
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uint64_t rsi;
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uint64_t rbp;
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uint64_t rbx;
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uint64_t rdx;
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uint64_t rax;
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uint64_t rcx;
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uint64_t rsp;
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uint64_t rip;
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uint64_t eflags;
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uint16_t cs;
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uint16_t gs;
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uint16_t fs;
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uint16_t padding;
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uint64_t err;
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uint64_t trapno;
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uint64_t oldmask;
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uint64_t cr2;
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};
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struct SignalFloatContext32 {
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CPUContextX86::Fsave fsave;
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uint16_t status;
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uint16_t magic;
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CPUContextX86::Fxsave fxsave[0];
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};
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using SignalFloatContext64 = CPUContextX86_64::Fxsave;
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struct ContextTraits32 : public Traits32 {
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using ThreadContext = SignalThreadContext32;
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using FloatContext = SignalFloatContext32;
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};
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struct ContextTraits64 : public Traits64 {
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using ThreadContext = SignalThreadContext64;
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using FloatContext = SignalFloatContext64;
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};
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template <typename Traits>
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struct MContext {
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typename Traits::ThreadContext gprs;
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typename Traits::Address fpptr;
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typename Traits::ULong_32Only oldmask;
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typename Traits::ULong_32Only cr2;
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typename Traits::ULong_64Only reserved[8];
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};
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template <typename Traits>
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struct UContext {
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typename Traits::ULong flags;
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typename Traits::Address link;
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SignalStack<Traits> stack;
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MContext<Traits> mcontext;
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Sigset<Traits> sigmask;
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char fpregs_mem[0];
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};
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#elif defined(ARCH_CPU_ARM_FAMILY)
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struct CoprocessorContextHead {
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uint32_t magic;
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uint32_t size;
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};
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struct SignalFPSIMDContext {
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uint32_t fpsr;
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uint32_t fpcr;
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uint128_struct vregs[32];
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};
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struct SignalVFPContext {
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FloatContext::f32_t::vfp_t vfp;
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struct vfp_exc {
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uint32_t fpexc;
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uint32_t fpinst;
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uint32_t fpinst2;
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} vfp_exc;
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uint32_t padding;
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};
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struct SignalThreadContext32 {
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uint32_t regs[11];
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uint32_t fp;
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uint32_t ip;
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uint32_t sp;
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uint32_t lr;
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uint32_t pc;
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uint32_t cpsr;
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};
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using SignalThreadContext64 = ThreadContext::t64_t;
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struct MContext32Data {
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uint32_t trap_no;
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uint32_t error_code;
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uint32_t oldmask;
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SignalThreadContext32 gprs;
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uint32_t fault_address;
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};
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struct MContext64Data {
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uint64_t fault_address;
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SignalThreadContext64 gprs;
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};
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struct ContextTraits32 : public Traits32 {
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using MContext32 = MContext32Data;
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using MContext64 = Nothing;
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};
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struct ContextTraits64 : public Traits64 {
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using MContext32 = Nothing;
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using MContext64 = MContext64Data;
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};
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template <typename Traits>
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struct UContext {
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typename Traits::ULong flags;
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typename Traits::Address link;
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SignalStack<Traits> stack;
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typename Traits::MContext32 mcontext32;
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Sigset<Traits> sigmask;
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char padding[128 - sizeof(sigmask)];
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typename Traits::Char_64Only padding2[8];
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typename Traits::MContext64 mcontext64;
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typename Traits::Char_64Only padding3[8];
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char reserved[0];
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};
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#if defined(ARCH_CPU_ARMEL)
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static_assert(offsetof(UContext<ContextTraits32>, mcontext32) ==
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offsetof(ucontext_t, uc_mcontext),
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"context offset mismatch");
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static_assert(offsetof(UContext<ContextTraits32>, reserved) ==
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offsetof(ucontext_t, uc_regspace),
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"regspace offset mismatch");
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#elif defined(ARCH_CPU_ARM64)
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static_assert(offsetof(UContext<ContextTraits64>, mcontext64) ==
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offsetof(ucontext_t, uc_mcontext),
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"context offset mismtach");
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static_assert(offsetof(UContext<ContextTraits64>, reserved) ==
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offsetof(ucontext_t, uc_mcontext) +
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offsetof(mcontext_t, __reserved),
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"reserved space offset mismtach");
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#endif
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#elif defined(ARCH_CPU_MIPS_FAMILY)
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struct MContext32 {
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uint32_t regmask;
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uint32_t status;
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uint64_t pc;
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uint64_t gregs[32];
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struct {
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float _fp_fregs;
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unsigned int _fp_pad;
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} fpregs[32];
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uint32_t fp_owned;
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uint32_t fpc_csr;
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uint32_t fpc_eir;
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uint32_t used_math;
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uint32_t dsp;
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uint64_t mdhi;
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uint64_t mdlo;
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uint32_t hi1;
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uint32_t lo1;
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uint32_t hi2;
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uint32_t lo2;
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uint32_t hi3;
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uint32_t lo3;
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};
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struct MContext64 {
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uint64_t gregs[32];
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double fpregs[32];
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uint64_t mdhi;
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uint64_t hi1;
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uint64_t hi2;
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uint64_t hi3;
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uint64_t mdlo;
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uint64_t lo1;
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uint64_t lo2;
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uint64_t lo3;
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uint64_t pc;
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uint32_t fpc_csr;
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uint32_t used_math;
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uint32_t dsp;
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uint32_t __glibc_reserved1;
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};
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struct SignalThreadContext32 {
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uint64_t regs[32];
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uint32_t lo;
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uint32_t hi;
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uint32_t cp0_epc;
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uint32_t cp0_badvaddr;
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uint32_t cp0_status;
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uint32_t cp0_cause;
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SignalThreadContext32() {}
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explicit SignalThreadContext32(
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const struct ThreadContext::t32_t& thread_context) {
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for (size_t reg = 0; reg < 32; ++reg) {
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regs[reg] = thread_context.regs[reg];
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}
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lo = thread_context.lo;
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hi = thread_context.hi;
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cp0_epc = thread_context.cp0_epc;
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cp0_badvaddr = thread_context.cp0_badvaddr;
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cp0_status = thread_context.cp0_status;
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cp0_cause = thread_context.cp0_cause;
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}
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};
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struct ContextTraits32 : public Traits32 {
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using MContext = MContext32;
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using SignalThreadContext = SignalThreadContext32;
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using SignalFloatContext = FloatContext::f32_t;
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using CPUContext = CPUContextMIPS;
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};
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struct ContextTraits64 : public Traits64 {
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using MContext = MContext64;
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using SignalThreadContext = ThreadContext::t64_t;
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using SignalFloatContext = FloatContext::f64_t;
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using CPUContext = CPUContextMIPS64;
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};
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template <typename Traits>
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struct UContext {
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typename Traits::ULong flags;
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typename Traits::Address link;
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SignalStack<Traits> stack;
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typename Traits::ULong_32Only alignment_padding_;
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typename Traits::MContext mcontext;
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Sigset<Traits> sigmask;
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};
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#if defined(ARCH_CPU_MIPSEL)
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static_assert(offsetof(UContext<ContextTraits32>, mcontext) ==
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offsetof(ucontext_t, uc_mcontext),
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"context offset mismatch");
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static_assert(offsetof(UContext<ContextTraits32>, mcontext.gregs) ==
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offsetof(ucontext_t, uc_mcontext.gregs),
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"context offset mismatch");
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static_assert(offsetof(UContext<ContextTraits32>, mcontext.fpregs) ==
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offsetof(ucontext_t, uc_mcontext.fpregs),
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"context offset mismatch");
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#elif defined(ARCH_CPU_MIPS64EL)
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static_assert(offsetof(UContext<ContextTraits64>, mcontext) ==
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offsetof(ucontext_t, uc_mcontext),
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"context offset mismtach");
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static_assert(offsetof(UContext<ContextTraits64>, mcontext.gregs) ==
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offsetof(ucontext_t, uc_mcontext.gregs),
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"context offset mismatch");
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static_assert(offsetof(UContext<ContextTraits64>, mcontext.fpregs) ==
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offsetof(ucontext_t, uc_mcontext.fpregs),
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"context offset mismatch");
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#endif
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#else
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#error Port.
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#endif // ARCH_CPU_X86_FAMILY
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#pragma pack(pop)
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} // namespace internal
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} // namespace crashpad
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#endif // CRASHPAD_SNAPSHOT_LINUX_SNAPSHOT_SIGNAL_CONTEXT_H_
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