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Diffstat (limited to 'src/third_party/gperftools-2.5/src/stacktrace_x86-inl.h')
| -rw-r--r-- | src/third_party/gperftools-2.5/src/stacktrace_x86-inl.h | 354 |
1 files changed, 0 insertions, 354 deletions
diff --git a/src/third_party/gperftools-2.5/src/stacktrace_x86-inl.h b/src/third_party/gperftools-2.5/src/stacktrace_x86-inl.h deleted file mode 100644 index 46eb5d82d71..00000000000 --- a/src/third_party/gperftools-2.5/src/stacktrace_x86-inl.h +++ /dev/null @@ -1,354 +0,0 @@ -// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- -// Copyright (c) 2005, Google Inc. -// All rights reserved. -// -// Redistribution and use in source and binary forms, with or without -// modification, are permitted provided that the following conditions are -// met: -// -// * Redistributions of source code must retain the above copyright -// notice, this list of conditions and the following disclaimer. -// * Redistributions in binary form must reproduce the above -// copyright notice, this list of conditions and the following disclaimer -// in the documentation and/or other materials provided with the -// distribution. -// * Neither the name of Google Inc. nor the names of its -// contributors may be used to endorse or promote products derived from -// this software without specific prior written permission. -// -// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - -// --- -// Author: Sanjay Ghemawat -// -// Produce stack trace - -#ifndef BASE_STACKTRACE_X86_INL_H_ -#define BASE_STACKTRACE_X86_INL_H_ -// Note: this file is included into stacktrace.cc more than once. -// Anything that should only be defined once should be here: - -#include "config.h" -#include <stdlib.h> // for NULL -#include <assert.h> -#if defined(HAVE_SYS_UCONTEXT_H) -#include <sys/ucontext.h> -#elif defined(HAVE_UCONTEXT_H) -#include <ucontext.h> // for ucontext_t -#elif defined(HAVE_CYGWIN_SIGNAL_H) -// cygwin/signal.h has a buglet where it uses pthread_attr_t without -// #including <pthread.h> itself. So we have to do it. -# ifdef HAVE_PTHREAD -# include <pthread.h> -# endif -#include <cygwin/signal.h> -typedef ucontext ucontext_t; -#endif -#ifdef HAVE_STDINT_H -#include <stdint.h> // for uintptr_t -#endif -#ifdef HAVE_UNISTD_H -#include <unistd.h> -#endif -#ifdef HAVE_MMAP -#include <sys/mman.h> // for msync -#include "base/vdso_support.h" -#endif - -#include "gperftools/stacktrace.h" - -#if defined(__linux__) && defined(__i386__) && defined(__ELF__) && defined(HAVE_MMAP) -// Count "push %reg" instructions in VDSO __kernel_vsyscall(), -// preceding "syscall" or "sysenter". -// If __kernel_vsyscall uses frame pointer, answer 0. -// -// kMaxBytes tells how many instruction bytes of __kernel_vsyscall -// to analyze before giving up. Up to kMaxBytes+1 bytes of -// instructions could be accessed. -// -// Here are known __kernel_vsyscall instruction sequences: -// -// SYSENTER (linux-2.6.26/arch/x86/vdso/vdso32/sysenter.S). -// Used on Intel. -// 0xffffe400 <__kernel_vsyscall+0>: push %ecx -// 0xffffe401 <__kernel_vsyscall+1>: push %edx -// 0xffffe402 <__kernel_vsyscall+2>: push %ebp -// 0xffffe403 <__kernel_vsyscall+3>: mov %esp,%ebp -// 0xffffe405 <__kernel_vsyscall+5>: sysenter -// -// SYSCALL (see linux-2.6.26/arch/x86/vdso/vdso32/syscall.S). -// Used on AMD. -// 0xffffe400 <__kernel_vsyscall+0>: push %ebp -// 0xffffe401 <__kernel_vsyscall+1>: mov %ecx,%ebp -// 0xffffe403 <__kernel_vsyscall+3>: syscall -// -// i386 (see linux-2.6.26/arch/x86/vdso/vdso32/int80.S) -// 0xffffe400 <__kernel_vsyscall+0>: int $0x80 -// 0xffffe401 <__kernel_vsyscall+1>: ret -// -static const int kMaxBytes = 10; - -// We use assert()s instead of DCHECK()s -- this is too low level -// for DCHECK(). - -static int CountPushInstructions(const unsigned char *const addr) { - int result = 0; - for (int i = 0; i < kMaxBytes; ++i) { - if (addr[i] == 0x89) { - // "mov reg,reg" - if (addr[i + 1] == 0xE5) { - // Found "mov %esp,%ebp". - return 0; - } - ++i; // Skip register encoding byte. - } else if (addr[i] == 0x0F && - (addr[i + 1] == 0x34 || addr[i + 1] == 0x05)) { - // Found "sysenter" or "syscall". - return result; - } else if ((addr[i] & 0xF0) == 0x50) { - // Found "push %reg". - ++result; - } else if (addr[i] == 0xCD && addr[i + 1] == 0x80) { - // Found "int $0x80" - assert(result == 0); - return 0; - } else { - // Unexpected instruction. - assert(0 == "unexpected instruction in __kernel_vsyscall"); - return 0; - } - } - // Unexpected: didn't find SYSENTER or SYSCALL in - // [__kernel_vsyscall, __kernel_vsyscall + kMaxBytes) interval. - assert(0 == "did not find SYSENTER or SYSCALL in __kernel_vsyscall"); - return 0; -} -#endif - -// Given a pointer to a stack frame, locate and return the calling -// stackframe, or return NULL if no stackframe can be found. Perform sanity -// checks (the strictness of which is controlled by the boolean parameter -// "STRICT_UNWINDING") to reduce the chance that a bad pointer is returned. -template<bool STRICT_UNWINDING, bool WITH_CONTEXT> -static void **NextStackFrame(void **old_sp, const void *uc) { - void **new_sp = (void **) *old_sp; - -#if defined(__linux__) && defined(__i386__) && defined(HAVE_VDSO_SUPPORT) - if (WITH_CONTEXT && uc != NULL) { - // How many "push %reg" instructions are there at __kernel_vsyscall? - // This is constant for a given kernel and processor, so compute - // it only once. - static int num_push_instructions = -1; // Sentinel: not computed yet. - // Initialize with sentinel value: __kernel_rt_sigreturn can not possibly - // be there. - static const unsigned char *kernel_rt_sigreturn_address = NULL; - static const unsigned char *kernel_vsyscall_address = NULL; - if (num_push_instructions == -1) { - base::VDSOSupport vdso; - if (vdso.IsPresent()) { - base::VDSOSupport::SymbolInfo rt_sigreturn_symbol_info; - base::VDSOSupport::SymbolInfo vsyscall_symbol_info; - if (!vdso.LookupSymbol("__kernel_rt_sigreturn", "LINUX_2.5", - STT_FUNC, &rt_sigreturn_symbol_info) || - !vdso.LookupSymbol("__kernel_vsyscall", "LINUX_2.5", - STT_FUNC, &vsyscall_symbol_info) || - rt_sigreturn_symbol_info.address == NULL || - vsyscall_symbol_info.address == NULL) { - // Unexpected: 32-bit VDSO is present, yet one of the expected - // symbols is missing or NULL. - assert(0 == "VDSO is present, but doesn't have expected symbols"); - num_push_instructions = 0; - } else { - kernel_rt_sigreturn_address = - reinterpret_cast<const unsigned char *>( - rt_sigreturn_symbol_info.address); - kernel_vsyscall_address = - reinterpret_cast<const unsigned char *>( - vsyscall_symbol_info.address); - num_push_instructions = - CountPushInstructions(kernel_vsyscall_address); - } - } else { - num_push_instructions = 0; - } - } - if (num_push_instructions != 0 && kernel_rt_sigreturn_address != NULL && - old_sp[1] == kernel_rt_sigreturn_address) { - const ucontext_t *ucv = static_cast<const ucontext_t *>(uc); - // This kernel does not use frame pointer in its VDSO code, - // and so %ebp is not suitable for unwinding. - void **const reg_ebp = - reinterpret_cast<void **>(ucv->uc_mcontext.gregs[REG_EBP]); - const unsigned char *const reg_eip = - reinterpret_cast<unsigned char *>(ucv->uc_mcontext.gregs[REG_EIP]); - if (new_sp == reg_ebp && - kernel_vsyscall_address <= reg_eip && - reg_eip - kernel_vsyscall_address < kMaxBytes) { - // We "stepped up" to __kernel_vsyscall, but %ebp is not usable. - // Restore from 'ucv' instead. - void **const reg_esp = - reinterpret_cast<void **>(ucv->uc_mcontext.gregs[REG_ESP]); - // Check that alleged %esp is not NULL and is reasonably aligned. - if (reg_esp && - ((uintptr_t)reg_esp & (sizeof(reg_esp) - 1)) == 0) { - // Check that alleged %esp is actually readable. This is to prevent - // "double fault" in case we hit the first fault due to e.g. stack - // corruption. - // - // page_size is linker-initalized to avoid async-unsafe locking - // that GCC would otherwise insert (__cxa_guard_acquire etc). - static int page_size; - if (page_size == 0) { - // First time through. - page_size = getpagesize(); - } - void *const reg_esp_aligned = - reinterpret_cast<void *>( - (uintptr_t)(reg_esp + num_push_instructions - 1) & - ~(page_size - 1)); - if (msync(reg_esp_aligned, page_size, MS_ASYNC) == 0) { - // Alleged %esp is readable, use it for further unwinding. - new_sp = reinterpret_cast<void **>( - reg_esp[num_push_instructions - 1]); - } - } - } - } - } -#endif - - // Check that the transition from frame pointer old_sp to frame - // pointer new_sp isn't clearly bogus - if (STRICT_UNWINDING) { - // With the stack growing downwards, older stack frame must be - // at a greater address that the current one. - if (new_sp <= old_sp) return NULL; - // Assume stack frames larger than 100,000 bytes are bogus. - if ((uintptr_t)new_sp - (uintptr_t)old_sp > 100000) return NULL; - } else { - // In the non-strict mode, allow discontiguous stack frames. - // (alternate-signal-stacks for example). - if (new_sp == old_sp) return NULL; - if (new_sp > old_sp) { - // And allow frames upto about 1MB. - const uintptr_t delta = (uintptr_t)new_sp - (uintptr_t)old_sp; - const uintptr_t acceptable_delta = 1000000; - if (delta > acceptable_delta) { - return NULL; - } - } - } - if ((uintptr_t)new_sp & (sizeof(void *) - 1)) return NULL; -#ifdef __i386__ - // On 64-bit machines, the stack pointer can be very close to - // 0xffffffff, so we explicitly check for a pointer into the - // last two pages in the address space - if ((uintptr_t)new_sp >= 0xffffe000) return NULL; -#endif -#ifdef HAVE_MMAP - if (!STRICT_UNWINDING) { - // Lax sanity checks cause a crash on AMD-based machines with - // VDSO-enabled kernels. - // Make an extra sanity check to insure new_sp is readable. - // Note: NextStackFrame<false>() is only called while the program - // is already on its last leg, so it's ok to be slow here. - static int page_size = getpagesize(); - void *new_sp_aligned = (void *)((uintptr_t)new_sp & ~(page_size - 1)); - if (msync(new_sp_aligned, page_size, MS_ASYNC) == -1) - return NULL; - } -#endif - return new_sp; -} - -#endif // BASE_STACKTRACE_X86_INL_H_ - -// Note: this part of the file is included several times. -// Do not put globals below. - -// The following 4 functions are generated from the code below: -// GetStack{Trace,Frames}() -// GetStack{Trace,Frames}WithContext() -// -// These functions take the following args: -// void** result: the stack-trace, as an array -// int* sizes: the size of each stack frame, as an array -// (GetStackFrames* only) -// int max_depth: the size of the result (and sizes) array(s) -// int skip_count: how many stack pointers to skip before storing in result -// void* ucp: a ucontext_t* (GetStack{Trace,Frames}WithContext only) - -static int GET_STACK_TRACE_OR_FRAMES { - void **sp; -#if (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 2) || __llvm__ - // __builtin_frame_address(0) can return the wrong address on gcc-4.1.0-k8. - // It's always correct on llvm, and the techniques below aren't (in - // particular, llvm-gcc will make a copy of pcs, so it's not in sp[2]), - // so we also prefer __builtin_frame_address when running under llvm. - sp = reinterpret_cast<void**>(__builtin_frame_address(0)); -#elif defined(__i386__) - // Stack frame format: - // sp[0] pointer to previous frame - // sp[1] caller address - // sp[2] first argument - // ... - // NOTE: This will break under llvm, since result is a copy and not in sp[2] - sp = (void **)&result - 2; -#elif defined(__x86_64__) - unsigned long rbp; - // Move the value of the register %rbp into the local variable rbp. - // We need 'volatile' to prevent this instruction from getting moved - // around during optimization to before function prologue is done. - // An alternative way to achieve this - // would be (before this __asm__ instruction) to call Noop() defined as - // static void Noop() __attribute__ ((noinline)); // prevent inlining - // static void Noop() { asm(""); } // prevent optimizing-away - __asm__ volatile ("mov %%rbp, %0" : "=r" (rbp)); - // Arguments are passed in registers on x86-64, so we can't just - // offset from &result - sp = (void **) rbp; -#else -# error Using stacktrace_x86-inl.h on a non x86 architecture! -#endif - - skip_count++; // skip parent's frame due to indirection in stacktrace.cc - - int n = 0; - while (sp && n < max_depth) { - if (*(sp+1) == reinterpret_cast<void *>(0)) { - // In 64-bit code, we often see a frame that - // points to itself and has a return address of 0. - break; - } -#if !IS_WITH_CONTEXT - const void *const ucp = NULL; -#endif - void **next_sp = NextStackFrame<!IS_STACK_FRAMES, IS_WITH_CONTEXT>(sp, ucp); - if (skip_count > 0) { - skip_count--; - } else { - result[n] = *(sp+1); -#if IS_STACK_FRAMES - if (next_sp > sp) { - sizes[n] = (uintptr_t)next_sp - (uintptr_t)sp; - } else { - // A frame-size of 0 is used to indicate unknown frame size. - sizes[n] = 0; - } -#endif - n++; - } - sp = next_sp; - } - return n; -} |