mirror of
https://github.com/gperftools/gperftools
synced 2025-01-27 09:23:52 +00:00
75b65f96b0
This patch fixes the stacktrace creating when the function is interrupted by a signal. For Linux, the vDSO signal trampoline symbol is compared against LR from stack backchain and handled different in that case (since the signal trampoline layout a different stack frame). Because of this extensive change the PowerPC stacktrace code has now been refactored to split in Linux and Darwin specific codes.
232 lines
8.6 KiB
C++
232 lines
8.6 KiB
C++
// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
|
|
// Copyright (c) 2007, 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: Craig Silverstein
|
|
//
|
|
// Produce stack trace. ABI documentation reference can be found at:
|
|
// * PowerPC32 ABI: https://www.power.org/documentation/
|
|
// power-architecture-32-bit-abi-supplement-1-0-embeddedlinuxunified/
|
|
// * PowerPC64 ABI:
|
|
// http://www.linux-foundation.org/spec/ELF/ppc64/PPC-elf64abi-1.9.html#STACK
|
|
|
|
#ifndef BASE_STACKTRACE_POWERPC_INL_H_
|
|
#define BASE_STACKTRACE_POWERPC_INL_H_
|
|
// Note: this file is included into stacktrace.cc more than once.
|
|
// Anything that should only be defined once should be here:
|
|
|
|
#include <stdint.h> // for uintptr_t
|
|
#include <stdlib.h> // for NULL
|
|
#include <gperftools/stacktrace.h>
|
|
#include <base/vdso_support.h>
|
|
|
|
#if defined(HAVE_SYS_UCONTEXT_H)
|
|
#include <sys/ucontext.h>
|
|
#elif defined(HAVE_UCONTEXT_H)
|
|
#include <ucontext.h> // for ucontext_t
|
|
#endif
|
|
typedef ucontext ucontext_t;
|
|
|
|
// PowerPC64 Little Endian follows BE wrt. backchain, condition register,
|
|
// and LR save area, so no need to adjust the reading struct.
|
|
struct layout_ppc {
|
|
struct layout_ppc *next;
|
|
#ifdef __PPC64__
|
|
long condition_register;
|
|
#endif
|
|
void *return_addr;
|
|
};
|
|
|
|
// Signal callbacks are handled by the vDSO symbol:
|
|
//
|
|
// * PowerPC64 Linux (arch/powerpc/kernel/vdso64/sigtramp.S):
|
|
// __kernel_sigtramp_rt64
|
|
// * PowerPC32 Linux (arch/powerpc/kernel/vdso32/sigtramp.S):
|
|
// __kernel_sigtramp32
|
|
// __kernel_sigtramp_rt32
|
|
//
|
|
// So a backtrace may need to specially handling if the symbol readed is
|
|
// the signal trampoline.
|
|
|
|
// 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>
|
|
static layout_ppc *NextStackFrame(layout_ppc *current) {
|
|
uintptr_t old_sp = (uintptr_t)(current);
|
|
uintptr_t new_sp = (uintptr_t)(current->next);
|
|
|
|
// 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 (new_sp - 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;
|
|
// And allow frames upto about 1MB.
|
|
if ((new_sp > old_sp) && (new_sp - old_sp > 1000000))
|
|
return NULL;
|
|
}
|
|
if (new_sp & (sizeof(void *) - 1))
|
|
return NULL;
|
|
return current->next;
|
|
}
|
|
|
|
// This ensures that GetStackTrace stes up the Link Register properly.
|
|
void StacktracePowerPCDummyFunction() __attribute__((noinline));
|
|
void StacktracePowerPCDummyFunction() { __asm__ volatile(""); }
|
|
#endif // BASE_STACKTRACE_POWERPC_INL_H_
|
|
|
|
// Note: this part of the file is included several times.
|
|
// Do not put globals below.
|
|
|
|
// Load instruction used on top-of-stack get.
|
|
#if defined(__PPC64__) || defined(__LP64__)
|
|
# define LOAD "ld"
|
|
#else
|
|
# define LOAD "lwz"
|
|
#endif
|
|
|
|
// 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 {
|
|
layout_ppc *current;
|
|
int n;
|
|
|
|
// Get the address on top-of-stack
|
|
current = reinterpret_cast<layout_ppc*> (__builtin_frame_address (0));
|
|
// And ignore the current symbol
|
|
current = current->next;
|
|
|
|
StacktracePowerPCDummyFunction();
|
|
|
|
n = 0;
|
|
skip_count++; // skip parent's frame due to indirection in
|
|
// stacktrace.cc
|
|
|
|
base::VDSOSupport vdso;
|
|
base::ElfMemImage::SymbolInfo rt_sigreturn_symbol_info;
|
|
#ifdef __PPC64__
|
|
const void *sigtramp64_vdso = 0;
|
|
if (vdso.LookupSymbol("__kernel_sigtramp_rt64", "LINUX_2.6.15", STT_NOTYPE,
|
|
&rt_sigreturn_symbol_info))
|
|
sigtramp64_vdso = rt_sigreturn_symbol_info.address;
|
|
#else
|
|
const void *sigtramp32_vdso = 0;
|
|
if (vdso.LookupSymbol("__kernel_sigtramp32", "LINUX_2.6.15", STT_NOTYPE,
|
|
&rt_sigreturn_symbol_info))
|
|
sigtramp32_vdso = rt_sigreturn_symbol_info.address;
|
|
const void *sigtramp32_rt_vdso = 0;
|
|
if (vdso.LookupSymbol("__kernel_sigtramp_rt32", "LINUX_2.6.15", STT_NOTYPE,
|
|
&rt_sigreturn_symbol_info))
|
|
sigtramp32_rt_vdso = rt_sigreturn_symbol_info.address;
|
|
#endif
|
|
|
|
while (current && n < max_depth) {
|
|
|
|
// The GetStackFrames routine is called when we are in some
|
|
// informational context (the failure signal handler for example).
|
|
// Use the non-strict unwinding rules to produce a stack trace
|
|
// that is as complete as possible (even if it contains a few
|
|
// bogus entries in some rare cases).
|
|
layout_ppc *next = NextStackFrame<!IS_STACK_FRAMES>(current);
|
|
if (skip_count > 0) {
|
|
skip_count--;
|
|
} else {
|
|
result[n] = current->return_addr;
|
|
#ifdef __PPC64__
|
|
if (sigtramp64_vdso && (sigtramp64_vdso == current->return_addr)) {
|
|
struct signal_frame_64 {
|
|
char dummy[128];
|
|
ucontext_t uc;
|
|
// We don't care about the rest, since the IP value is at 'uc' field.
|
|
} *sigframe = reinterpret_cast<signal_frame_64*>(current);
|
|
result[n] = (void*) sigframe->uc.uc_mcontext.gp_regs[PT_NIP];
|
|
}
|
|
#else
|
|
if (sigtramp32_vdso && (sigtramp32_vdso == current->return_addr)) {
|
|
struct signal_frame_32 {
|
|
char dummy[64];
|
|
struct sigcontext sctx;
|
|
mcontext_t mctx;
|
|
// We don't care about the rest, since IP value is at 'mctx' field.
|
|
} *sigframe = reinterpret_cast<signal_frame_32*>(current);
|
|
result[n] = (void*) sigframe->mctx.gregs[PT_NIP];
|
|
} else if (sigtramp32_rt_vdso && (sigtramp32_rt_vdso == current->return_addr)) {
|
|
struct rt_signal_frame_32 {
|
|
char dummy[64 + 16];
|
|
siginfo_t info;
|
|
struct ucontext uc;
|
|
// We don't care about the rest, since IP value is at 'uc' field.A
|
|
} *sigframe = reinterpret_cast<rt_signal_frame_32*>(current);
|
|
result[n] = (void*) sigframe->uc.uc_mcontext.uc_regs->gregs[PT_NIP];
|
|
}
|
|
#endif
|
|
|
|
#if IS_STACK_FRAMES
|
|
if (next > current) {
|
|
sizes[n] = (uintptr_t)next - (uintptr_t)current;
|
|
} else {
|
|
// A frame-size of 0 is used to indicate unknown frame size.
|
|
sizes[n] = 0;
|
|
}
|
|
#endif
|
|
n++;
|
|
}
|
|
current = next;
|
|
}
|
|
|
|
// It's possible the second-last stack frame can't return
|
|
// (that is, it's __libc_start_main), in which case
|
|
// the CRT startup code will have set its LR to 'NULL'.
|
|
if (n > 0 && result[n-1] == NULL)
|
|
n--;
|
|
|
|
return n;
|
|
}
|