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b7a249d26f
libunwind uses a minimal set of necessary standard library functions, basically just `memset` and `memcpy`. There is a single use of `strcpy` to copy the bytes `"CLNGUNW"` into a `uint64_t` object. This is both an arguably odd use of the `strcpy` function as well as it unnecessarily widens the set of library functions that must be available to build libunwind, which can be an obstacle in baremetal scenarios. This change simply replaces this one `strcpy` with the more fundamental `memcpy`.
73 lines
2.1 KiB
C++
73 lines
2.1 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// REQUIRES: linux
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// TODO: Figure out why this fails with Memory Sanitizer.
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// XFAIL: msan
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// Basic test for _Unwind_ForcedUnwind.
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// See libcxxabi/test/forced_unwind* tests too.
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#undef NDEBUG
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#include <assert.h>
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#include <dlfcn.h>
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#include <signal.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <unwind.h>
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void foo();
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_Unwind_Exception ex;
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_Unwind_Reason_Code stop(int version, _Unwind_Action actions,
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_Unwind_Exception_Class exceptionClass,
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_Unwind_Exception *exceptionObject,
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struct _Unwind_Context *context,
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void *stop_parameter) {
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assert(version == 1);
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assert((actions & _UA_FORCE_UNWIND) != 0);
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(void)exceptionClass;
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assert(exceptionObject == &ex);
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assert(stop_parameter == &foo);
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Dl_info info = {0, 0, 0, 0};
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// Unwind util the main is reached, above frames depend on the platform and
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// architecture.
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if (dladdr(reinterpret_cast<void *>(_Unwind_GetIP(context)), &info) &&
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info.dli_sname && !strcmp("main", info.dli_sname)) {
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_Exit(0);
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}
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return _URC_NO_REASON;
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}
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__attribute__((noinline)) void foo() {
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// Arm EHABI defines struct _Unwind_Control_Block as exception
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// object. Ensure struct _Unwind_Exception* work there too,
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// because _Unwind_Exception in this case is just an alias.
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struct _Unwind_Exception *e = &ex;
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#if defined(_LIBUNWIND_ARM_EHABI)
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// Create a mock exception object.
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memset(e, '\0', sizeof(*e));
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memcpy(&e->exception_class, "CLNGUNW", sizeof(e->exception_class));
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#endif
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_Unwind_ForcedUnwind(e, stop, (void *)&foo);
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}
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int main() {
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foo();
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return -2;
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}
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