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PowerPC: stacktrace function refactor and fixes
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.
This commit is contained in:
Adhemerval Zanella
parent
75685f539a
commit
b8c4ba7296
@ -109,7 +109,11 @@ struct GetStackImplementation {
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#endif // i386 || x86_64
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#if defined(__ppc__) || defined(__PPC__)
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#define STACKTRACE_INL_HEADER "stacktrace_powerpc-inl.h"
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#if defined(__linux__)
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#define STACKTRACE_INL_HEADER "stacktrace_powerpc-linux-inl.h"
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#else
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#define STACKTRACE_INL_HEADER "stacktrace_powerpc-darwin-inl.h"
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#endif
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#define GST_SUFFIX ppc
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#include "stacktrace_impl_setup-inl.h"
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#undef GST_SUFFIX
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158
src/stacktrace_powerpc-darwin-inl.h
Normal file
158
src/stacktrace_powerpc-darwin-inl.h
Normal file
@ -0,0 +1,158 @@
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// Copyright (c) 2007, Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// ---
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// Produce stack trace. ABI documentation reference can be found at:
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// * PowerPC32 ABI: https://www.power.org/documentation/
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// power-architecture-32-bit-abi-supplement-1-0-embeddedlinuxunified/
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// * PowerPC64 ABI:
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// http://www.linux-foundation.org/spec/ELF/ppc64/PPC-elf64abi-1.9.html#STACK
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#ifndef BASE_STACKTRACE_POWERPC_INL_H_
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#define BASE_STACKTRACE_POWERPC_INL_H_
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// Note: this file is included into stacktrace.cc more than once.
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// Anything that should only be defined once should be here:
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#include <stdint.h> // for uintptr_t
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#include <stdlib.h> // for NULL
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#include <gperftools/stacktrace.h>
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// Given a pointer to a stack frame, locate and return the calling
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// stackframe, or return NULL if no stackframe can be found. Perform sanity
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// checks (the strictness of which is controlled by the boolean parameter
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// "STRICT_UNWINDING") to reduce the chance that a bad pointer is returned.
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template<bool STRICT_UNWINDING>
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static void **NextStackFrame(void **old_sp) {
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void **new_sp = (void **) *old_sp;
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// Check that the transition from frame pointer old_sp to frame
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// pointer new_sp isn't clearly bogus
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if (STRICT_UNWINDING) {
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// With the stack growing downwards, older stack frame must be
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// at a greater address that the current one.
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if (new_sp <= old_sp) return NULL;
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// Assume stack frames larger than 100,000 bytes are bogus.
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if ((uintptr_t)new_sp - (uintptr_t)old_sp > 100000) return NULL;
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} else {
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// In the non-strict mode, allow discontiguous stack frames.
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// (alternate-signal-stacks for example).
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if (new_sp == old_sp) return NULL;
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// And allow frames upto about 1MB.
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if ((new_sp > old_sp)
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&& ((uintptr_t)new_sp - (uintptr_t)old_sp > 1000000)) return NULL;
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}
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if ((uintptr_t)new_sp & (sizeof(void *) - 1)) return NULL;
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return new_sp;
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}
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// This ensures that GetStackTrace stes up the Link Register properly.
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void StacktracePowerPCDummyFunction() __attribute__((noinline));
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void StacktracePowerPCDummyFunction() { __asm__ volatile(""); }
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#endif // BASE_STACKTRACE_POWERPC_INL_H_
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// Note: this part of the file is included several times.
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// Do not put globals below.
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// The following 4 functions are generated from the code below:
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// GetStack{Trace,Frames}()
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// GetStack{Trace,Frames}WithContext()
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//
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// These functions take the following args:
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// void** result: the stack-trace, as an array
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// int* sizes: the size of each stack frame, as an array
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// (GetStackFrames* only)
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// int max_depth: the size of the result (and sizes) array(s)
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// int skip_count: how many stack pointers to skip before storing in result
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// void* ucp: a ucontext_t* (GetStack{Trace,Frames}WithContext only)
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int GET_STACK_TRACE_OR_FRAMES {
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void **sp;
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// Apple OS X uses an old version of gnu as -- both Darwin 7.9.0 (Panther)
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// and Darwin 8.8.1 (Tiger) use as 1.38. This means we have to use a
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// different asm syntax. I don't know quite the best way to discriminate
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// systems using the old as from the new one; I've gone with __APPLE__.
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// TODO(csilvers): use autoconf instead, to look for 'as --version' == 1 or 2
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__asm__ volatile ("mr %0,r1" : "=r" (sp));
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// On PowerPC, the "Link Register" or "Link Record" (LR), is a stack
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// entry that holds the return address of the subroutine call (what
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// instruction we run after our function finishes). This is the
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// same as the stack-pointer of our parent routine, which is what we
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// want here. While the compiler will always(?) set up LR for
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// subroutine calls, it may not for leaf functions (such as this one).
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// This routine forces the compiler (at least gcc) to push it anyway.
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StacktracePowerPCDummyFunction();
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#if IS_STACK_FRAMES
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// Note we do *not* increment skip_count here for the SYSV ABI. If
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// we did, the list of stack frames wouldn't properly match up with
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// the list of return addresses. Note this means the top pc entry
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// is probably bogus for linux/ppc (and other SYSV-ABI systems).
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#else
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// The LR save area is used by the callee, so the top entry is bogus.
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skip_count++;
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#endif
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int n = 0;
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while (sp && n < max_depth) {
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// The GetStackFrames routine is called when we are in some
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// informational context (the failure signal handler for example).
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// Use the non-strict unwinding rules to produce a stack trace
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// that is as complete as possible (even if it contains a few
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// bogus entries in some rare cases).
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void **next_sp = NextStackFrame<!IS_STACK_FRAMES>(sp);
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if (skip_count > 0) {
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skip_count--;
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} else {
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// PowerPC has 3 main ABIs, which say where in the stack the
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// Link Register is. For DARWIN and AIX (used by apple and
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// linux ppc64), it's in sp[2]. For SYSV (used by linux ppc),
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// it's in sp[1].
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#if defined(__PPC64__)
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// This check is in case the compiler doesn't define _CALL_AIX/etc.
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result[n] = *(sp+2);
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#elif defined(__linux)
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// This check is in case the compiler doesn't define _CALL_SYSV.
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result[n] = *(sp+1);
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#endif
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#if IS_STACK_FRAMES
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if (next_sp > sp) {
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sizes[n] = (uintptr_t)next_sp - (uintptr_t)sp;
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} else {
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// A frame-size of 0 is used to indicate unknown frame size.
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sizes[n] = 0;
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}
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#endif
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n++;
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}
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sp = next_sp;
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}
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return n;
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}
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@ -1,11 +1,11 @@
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// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
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// Copyright (c) 2007, Google Inc.
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// All rights reserved.
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//
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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@ -15,7 +15,7 @@
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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@ -31,11 +31,11 @@
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// ---
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// Author: Craig Silverstein
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//
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// Produce stack trace. I'm guessing (hoping!) the code is much like
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// for x86. For apple machines, at least, it seems to be; see
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// http://developer.apple.com/documentation/mac/runtimehtml/RTArch-59.html
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// http://www.linux-foundation.org/spec/ELF/ppc64/PPC-elf64abi-1.9.html#STACK
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// Linux has similar code: http://patchwork.ozlabs.org/linuxppc/patch?id=8882
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// Produce stack trace. ABI documentation reference can be found at:
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// * PowerPC32 ABI: https://www.power.org/documentation/
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// power-architecture-32-bit-abi-supplement-1-0-embeddedlinuxunified/
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// * PowerPC64 ABI:
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// http://www.linux-foundation.org/spec/ELF/ppc64/PPC-elf64abi-1.9.html#STACK
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#ifndef BASE_STACKTRACE_POWERPC_INL_H_
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#define BASE_STACKTRACE_POWERPC_INL_H_
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@ -45,15 +45,36 @@
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#include <stdint.h> // for uintptr_t
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#include <stdlib.h> // for NULL
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#include <gperftools/stacktrace.h>
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#include <base/vdso_support.h>
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#if defined(HAVE_SYS_UCONTEXT_H)
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#include <sys/ucontext.h>
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#elif defined(HAVE_UCONTEXT_H)
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#include <ucontext.h> // for ucontext_t
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#endif
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typedef ucontext ucontext_t;
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// PowerPC64 Little Endian follows BE wrt. backchain, condition register,
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// and LR save area, so no need to adjust the reading struct.
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struct layout_ppc {
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struct layout_ppc *next;
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#if defined(__APPLE__) || (defined(__linux) && defined(__PPC64__))
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#ifdef __PPC64__
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long condition_register;
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#endif
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void *return_addr;
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};
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// Signal callbacks are handled by the vDSO symbol:
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//
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// * PowerPC64 Linux (arch/powerpc/kernel/vdso64/sigtramp.S):
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// __kernel_sigtramp_rt64
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// * PowerPC32 Linux (arch/powerpc/kernel/vdso32/sigtramp.S):
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// __kernel_sigtramp32
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// __kernel_sigtramp_rt32
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//
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// So a backtrace may need to specially handling if the symbol readed is
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// the signal trampoline.
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// Given a pointer to a stack frame, locate and return the calling
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// stackframe, or return NULL if no stackframe can be found. Perform sanity
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// checks (the strictness of which is controlled by the boolean parameter
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@ -102,19 +123,6 @@ void StacktracePowerPCDummyFunction() { __asm__ volatile(""); }
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# define LOAD "lwz"
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#endif
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#if defined(__linux__) && defined(__PPC__)
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# define TOP_STACK "%0,0(1)"
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#elif defined(__MACH__) && defined(__APPLE__)
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// Apple OS X uses an old version of gnu as -- both Darwin 7.9.0 (Panther)
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// and Darwin 8.8.1 (Tiger) use as 1.38. This means we have to use a
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// different asm syntax. I don't know quite the best way to discriminate
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// systems using the old as from the new one; I've gone with __APPLE__.
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// TODO(csilvers): use autoconf instead, to look for 'as --version' == 1 or 2
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# define TOP_STACK "%0,0(r1)"
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#endif
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// The following 4 functions are generated from the code below:
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// GetStack{Trace,Frames}()
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// GetStack{Trace,Frames}WithContext()
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@ -130,17 +138,35 @@ static int GET_STACK_TRACE_OR_FRAMES {
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layout_ppc *current;
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int n;
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// Force GCC to spill LR.
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asm volatile ("" : "=l"(current));
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// Get the address on top-of-stack
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asm volatile (LOAD " " TOP_STACK : "=r"(current));
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current = reinterpret_cast<layout_ppc*> (__builtin_frame_address (0));
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// And ignore the current symbol
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current = current->next;
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StacktracePowerPCDummyFunction();
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n = 0;
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skip_count++; // skip parent's frame due to indirection in
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// stacktrace.cc
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base::VDSOSupport vdso;
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base::ElfMemImage::SymbolInfo rt_sigreturn_symbol_info;
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#ifdef __PPC64__
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const void *sigtramp64_vdso = 0;
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if (vdso.LookupSymbol("__kernel_sigtramp_rt64", "LINUX_2.6.15", STT_NOTYPE,
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&rt_sigreturn_symbol_info))
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sigtramp64_vdso = rt_sigreturn_symbol_info.address;
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#else
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const void *sigtramp32_vdso = 0;
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if (vdso.LookupSymbol("__kernel_sigtramp32", "LINUX_2.6.15", STT_NOTYPE,
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&rt_sigreturn_symbol_info))
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sigtramp32_vdso = rt_sigreturn_symbol_info.address;
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const void *sigtramp32_rt_vdso = 0;
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if (vdso.LookupSymbol("__kernel_sigtramp_rt32", "LINUX_2.6.15", STT_NOTYPE,
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&rt_sigreturn_symbol_info))
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sigtramp32_rt_vdso = rt_sigreturn_symbol_info.address;
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#endif
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while (current && n < max_depth) {
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// The GetStackFrames routine is called when we are in some
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@ -153,6 +179,35 @@ static int GET_STACK_TRACE_OR_FRAMES {
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skip_count--;
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} else {
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result[n] = current->return_addr;
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#ifdef __PPC64__
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if (sigtramp64_vdso && (sigtramp64_vdso == current->return_addr)) {
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struct signal_frame_64 {
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char dummy[128];
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ucontext_t uc;
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// We don't care about the rest, since the IP value is at 'uc' field.
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} *sigframe = reinterpret_cast<signal_frame_64*>(current);
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result[n] = (void*) sigframe->uc.uc_mcontext.gp_regs[PT_NIP];
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}
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#else
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if (sigtramp32_vdso && (sigtramp32_vdso == current->return_addr)) {
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struct signal_frame_32 {
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char dummy[64];
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struct sigcontext sctx;
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mcontext_t mctx;
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// We don't care about the rest, since IP value is at 'mctx' field.
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} *sigframe = reinterpret_cast<signal_frame_32*>(current);
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result[n] = (void*) sigframe->mctx.gregs[PT_NIP];
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} else if (sigtramp32_rt_vdso && (sigtramp32_rt_vdso == current->return_addr)) {
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struct rt_signal_frame_32 {
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char dummy[64 + 16];
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siginfo_t info;
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struct ucontext uc;
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// We don't care about the rest, since IP value is at 'uc' field.A
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} *sigframe = reinterpret_cast<rt_signal_frame_32*>(current);
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result[n] = (void*) sigframe->uc.uc_mcontext.uc_regs->gregs[PT_NIP];
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}
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#endif
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#if IS_STACK_FRAMES
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if (next > current) {
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sizes[n] = (uintptr_t)next - (uintptr_t)current;
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