c45087bffa
Kernel provides virtual DSO for stack unwinding/exception handlind info for signal usage case. Stack unwinding routines use 'dl_iterate_phdr' function for additional DWARF info gathering from DSOs. Patch enables virtual DSO enumeration via dl_iterate_phdr function. Signed-off-by: Sergey Melnikov <sergey.melnikov@intel.com> Change-Id: Ic2882b28f40b456a088bc1e63c50cbfda7e4a102
70 lines
2.1 KiB
C
70 lines
2.1 KiB
C
/*
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* Copyright (C) 2013 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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/*
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* Contributed by: Intel Corporation
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*/
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#include <stdio.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unwind.h>
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#define noinline __attribute__((__noinline__))
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#define unused __attribute__((__unused__))
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static noinline _Unwind_Reason_Code stop_fn(int a unused,
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_Unwind_Action action,
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_Unwind_Exception_Class b unused, struct _Unwind_Exception* c unused,
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struct _Unwind_Context* d unused, void* e unused) {
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if ((action & _UA_END_OF_STACK) != 0) {
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// We reached the end of the stack without executing foo_cleanup. Test failed.
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abort();
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}
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return _URC_NO_REASON;
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}
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static void noinline foo_cleanup(char* param unused) {
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exit(42);
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}
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static void noinline do_crash() {
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char* ptr = NULL;
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*ptr = 0; // Deliberately cause a SIGSEGV.
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}
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static void noinline foo() {
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char c1 __attribute__((cleanup(foo_cleanup)));
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do_crash();
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}
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// It's SEGSEGV handler. We start forced stack unwinding here.
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// If libgcc don't find dso for signal frame stack unwinding will be finished.
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// libgcc pass to stop_fn _UA_END_OF_STACK flag.
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// Test pass condition: stack unwinding through signal frame and foo1_handler execution.
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static void noinline sigsegv_handler(int param unused) {
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struct _Unwind_Exception* exception = (struct _Unwind_Exception*) malloc(sizeof(*exception));
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memset(&exception->exception_class, 0, sizeof(exception->exception_class));
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exception->exception_cleanup = 0;
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_Unwind_ForcedUnwind(exception, stop_fn, 0);
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}
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void do_test() {
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signal(SIGSEGV, &sigsegv_handler);
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foo();
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}
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