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- // -*- 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;
- }
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