forked from OSchip/llvm-project
88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
// REQUIRES: native-run
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// UNSUPPORTED: arm, aarch64
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// RUN: %clang_builtins %s %librt -o %t && %run %t
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//===-- clear_cache_test.c - Test clear_cache -----------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include <stdio.h>
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#include <string.h>
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#include <stdint.h>
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#if defined(_WIN32)
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#include <windows.h>
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static uintptr_t get_page_size() {
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SYSTEM_INFO si;
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GetSystemInfo(&si);
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return si.dwPageSize;
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}
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#else
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#include <unistd.h>
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#include <sys/mman.h>
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static uintptr_t get_page_size() {
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return sysconf(_SC_PAGE_SIZE);
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}
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#endif
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extern void __clear_cache(void* start, void* end);
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typedef int (*pfunc)(void);
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// Make these static to avoid ILT jumps for incremental linking on Windows.
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static int func1() { return 1; }
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static int func2() { return 2; }
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void *__attribute__((noinline))
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memcpy_f(void *dst, const void *src, size_t n) {
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// ARM and MIPS nartually align functions, but use the LSB for ISA selection
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// (THUMB, MIPS16/uMIPS respectively). Ensure that the ISA bit is ignored in
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// the memcpy
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#if defined(__arm__) || defined(__mips__)
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return (void *)((uintptr_t)memcpy(dst, (void *)((uintptr_t)src & ~1), n) |
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((uintptr_t)src & 1));
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#else
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return memcpy(dst, (void *)((uintptr_t)src), n);
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#endif
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}
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unsigned char execution_buffer[128] __attribute__((aligned(8)));
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int main()
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{
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// make executable the page containing execution_buffer
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uintptr_t page_size = get_page_size();
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char* start = (char*)((uintptr_t)execution_buffer & (-page_size));
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char* end = (char*)((uintptr_t)(&execution_buffer[128+page_size]) & (-page_size));
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#if defined(_WIN32)
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DWORD dummy_oldProt;
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MEMORY_BASIC_INFORMATION b;
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if (!VirtualQuery(start, &b, sizeof(b)))
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return 1;
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if (!VirtualProtect(b.BaseAddress, b.RegionSize, PAGE_EXECUTE_READWRITE, &b.Protect))
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#else
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if (mprotect(start, end-start, PROT_READ|PROT_WRITE|PROT_EXEC) != 0)
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#endif
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return 1;
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// verify you can copy and execute a function
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pfunc f1 = (pfunc)memcpy_f(execution_buffer, func1, 128);
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__clear_cache(execution_buffer, &execution_buffer[128]);
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if ((*f1)() != 1)
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return 1;
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// verify you can overwrite a function with another
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pfunc f2 = (pfunc)memcpy_f(execution_buffer, func2, 128);
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__clear_cache(execution_buffer, &execution_buffer[128]);
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if ((*f2)() != 2)
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return 1;
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return 0;
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}
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