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85 lines
2.8 KiB
85 lines
2.8 KiB
/*
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* Copyright 2002-2019 Intel Corporation.
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*
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* This software is provided to you as Sample Source Code as defined in the accompanying
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* End User License Agreement for the Intel(R) Software Development Products ("Agreement")
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* section 1.L.
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*
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* This software and the related documents are provided as is, with no express or implied
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* warranties, other than those that are expressly stated in the License.
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*/
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/*
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* This app checks a bug in the debug_elf cache mechanism. The cache contains images
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* that have previously been searched for debug information. When a pintool calls the
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* PIN_GetSourceLocation API, this cache is searched first (for the nearest address
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* which is greater or equal to the one being searched for). However, unloaded images
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* were never removed from the cache. When the API was used during an image unload
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* callback, if the images at high addresses were removed first, the search could be
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* conducted on images in the cache that had already been removed from Pin's internal
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* data structures, thus causing an assertion. The solution was to remove these images
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* from the cache as well as from the other data structres.
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* This app loads two images and then unloads the higher addressed one first in order
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* to recreate the conditions mentioned above.
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*/
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#include <dlfcn.h>
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#include <iostream>
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#include <cstdlib>
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using std::cerr;
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using std::endl;
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void* DLopen(const char* filename) {
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void* handle = dlopen(filename, RTLD_LAZY);
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if (handle == NULL) {
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cerr << "APP ERROR: failed to open " << filename << " - " << dlerror() << endl;
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exit(-1);
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}
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return handle;
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}
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void* DLsym(void* handle, const char* symname) {
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dlerror(); // clear errors
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void* sym = dlsym(handle, symname);
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char* error = dlerror();
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if (error != NULL) {
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cerr << "APP ERROR: failed to get address for symbol " << symname << " - " << error << endl;
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exit(-1);
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}
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return sym;
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}
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void DLcloseBoth(void* first, void* second) {
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if (dlclose(first) != 0) {
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cerr << "APP ERROR: failed to close image at " << first << " - " << dlerror() << endl;
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exit(-1);
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}
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if (dlclose(second) != 0) {
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cerr << "APP ERROR: failed to close image at " << second << " - " << dlerror() << endl;
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exit(-1);
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}
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}
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/*
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* Expected argv arguments:
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* [1] image1
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* [2] image2
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*/
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int main(int argc, char* argv[]) {
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void* handle1 = DLopen(argv[1]); // open image1
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void* handle2 = DLopen(argv[2]); // open image2
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void* dummy1 = DLsym(handle1, "dummy1"); // get address from image1
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void* dummy2 = DLsym(handle2, "dummy2"); // get address from image2
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// unload images - higher addressed image first
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if (dummy1 > dummy2) {
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DLcloseBoth(handle1, handle2);
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}
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else {
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DLcloseBoth(handle2, handle1);
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}
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return 0;
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}
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