[PATCH] D28849: [compiler-rt] [test] Fix page address logic in clear_cache_test

[Michał Górny via Phabricator via cfe-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rL292729: [test] Fix page address logic in clear_cache_test (authored by mgorny).

Changed prior to commit:
  https://reviews.llvm.org/D28849?vs=85208&id=85248#toc

Repository:
  rL LLVM

https://reviews.llvm.org/D28849

Files:
  compiler-rt/trunk/test/builtins/Unit/clear_cache_test.c


Index: compiler-rt/trunk/test/builtins/Unit/clear_cache_test.c
===================================================================
--- compiler-rt/trunk/test/builtins/Unit/clear_cache_test.c
+++ compiler-rt/trunk/test/builtins/Unit/clear_cache_test.c
@@ -18,9 +18,20 @@
     if (!FlushInstructionCache(GetCurrentProcess(), start, end-start))
         exit(1);
 }
+
+static uintptr_t get_page_size() {
+    SYSTEM_INFO si;
+    GetSystemInfo(&si);
+    return si.dwPageSize;
+}
 #else
+#include <unistd.h>
 #include <sys/mman.h>
 extern void __clear_cache(void* start, void* end);
+
+static uintptr_t get_page_size() {
+    return sysconf(_SC_PAGE_SIZE);
+}
 #endif
 
 
@@ -56,8 +67,9 @@
 int main()
 {
     // make executable the page containing execution_buffer 
-    char* start = (char*)((uintptr_t)execution_buffer & (-4095));
-    char* end = (char*)((uintptr_t)(&execution_buffer[128+4096]) & (-4095));
+    uintptr_t page_size = get_page_size();
+    char* start = (char*)((uintptr_t)execution_buffer & (-page_size));
+    char* end = (char*)((uintptr_t)(&execution_buffer[128+page_size]) & (-page_size));
 #if defined(_WIN32)
     DWORD dummy_oldProt;
     MEMORY_BASIC_INFORMATION b;


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