132 lines
3.7 KiB
C++
132 lines
3.7 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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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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*/
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#include <stdint.h>
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#include <sys/ptrace.h>
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#include <sys/uio.h>
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#include <vector>
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#include <unwindstack/Elf.h>
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#include <unwindstack/MapInfo.h>
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#include <unwindstack/Regs.h>
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#include <unwindstack/RegsArm.h>
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#include <unwindstack/RegsArm64.h>
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#include <unwindstack/RegsMips.h>
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#include <unwindstack/RegsMips64.h>
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#include <unwindstack/RegsX86.h>
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#include <unwindstack/RegsX86_64.h>
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#include <unwindstack/UserArm.h>
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#include <unwindstack/UserArm64.h>
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#include <unwindstack/UserMips.h>
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#include <unwindstack/UserMips64.h>
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#include <unwindstack/UserX86.h>
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#include <unwindstack/UserX86_64.h>
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namespace unwindstack {
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// The largest user structure.
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constexpr size_t MAX_USER_REGS_SIZE = sizeof(mips64_user_regs) + 10;
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// This function assumes that reg_data is already aligned to a 64 bit value.
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// If not this could crash with an unaligned access.
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Regs* Regs::RemoteGet(pid_t pid) {
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// Make the buffer large enough to contain the largest registers type.
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std::vector<uint64_t> buffer(MAX_USER_REGS_SIZE / sizeof(uint64_t));
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struct iovec io;
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io.iov_base = buffer.data();
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io.iov_len = buffer.size() * sizeof(uint64_t);
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if (ptrace(PTRACE_GETREGSET, pid, NT_PRSTATUS, reinterpret_cast<void*>(&io)) == -1) {
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return nullptr;
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}
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switch (io.iov_len) {
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case sizeof(x86_user_regs):
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return RegsX86::Read(buffer.data());
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case sizeof(x86_64_user_regs):
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return RegsX86_64::Read(buffer.data());
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case sizeof(arm_user_regs):
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return RegsArm::Read(buffer.data());
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case sizeof(arm64_user_regs):
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return RegsArm64::Read(buffer.data());
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case sizeof(mips_user_regs):
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return RegsMips::Read(buffer.data());
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case sizeof(mips64_user_regs):
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return RegsMips64::Read(buffer.data());
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}
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return nullptr;
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}
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Regs* Regs::CreateFromUcontext(ArchEnum arch, void* ucontext) {
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switch (arch) {
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case ARCH_X86:
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return RegsX86::CreateFromUcontext(ucontext);
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case ARCH_X86_64:
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return RegsX86_64::CreateFromUcontext(ucontext);
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case ARCH_ARM:
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return RegsArm::CreateFromUcontext(ucontext);
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case ARCH_ARM64:
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return RegsArm64::CreateFromUcontext(ucontext);
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case ARCH_MIPS:
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return RegsMips::CreateFromUcontext(ucontext);
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case ARCH_MIPS64:
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return RegsMips64::CreateFromUcontext(ucontext);
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case ARCH_UNKNOWN:
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default:
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return nullptr;
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}
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}
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ArchEnum Regs::CurrentArch() {
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#if defined(__arm__)
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return ARCH_ARM;
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#elif defined(__aarch64__)
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return ARCH_ARM64;
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#elif defined(__i386__)
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return ARCH_X86;
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#elif defined(__x86_64__)
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return ARCH_X86_64;
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#elif defined(__mips__) && !defined(__LP64__)
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return ARCH_MIPS;
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#elif defined(__mips__) && defined(__LP64__)
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return ARCH_MIPS64;
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#else
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abort();
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#endif
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}
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Regs* Regs::CreateFromLocal() {
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Regs* regs;
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#if defined(__arm__)
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regs = new RegsArm();
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#elif defined(__aarch64__)
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regs = new RegsArm64();
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#elif defined(__i386__)
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regs = new RegsX86();
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#elif defined(__x86_64__)
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regs = new RegsX86_64();
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#elif defined(__mips__) && !defined(__LP64__)
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regs = new RegsMips();
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#elif defined(__mips__) && defined(__LP64__)
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regs = new RegsMips64();
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#else
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abort();
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#endif
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return regs;
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}
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} // namespace unwindstack
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