cddc153102
ld64 in the macOS 10.15 SDK gives __DATA a maxprot of 3, meaning it can't be made executable at runtime by default. Change clear_cache_test.c to use mmap()ed data that's mapped as writable and executable from the beginning, instead of trying to mprotect()ing a __DATA variable as executable. This fixes the test on macOS with the 10.15 SDK. PR43407. Differential Revision: https://reviews.llvm.org/D67929 llvm-svn: 372849
80 lines
2.4 KiB
C
80 lines
2.4 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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// 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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#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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#else
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#include <unistd.h>
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#include <sys/mman.h>
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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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int main()
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{
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const int kSize = 128;
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#if !defined(_WIN32)
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uint8_t *execution_buffer = mmap(0, kSize,
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PROT_READ | PROT_WRITE | PROT_EXEC,
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MAP_ANON | MAP_PRIVATE, 0, 0);
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if (execution_buffer == MAP_FAILED)
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return 1;
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#else
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HANDLE mapping = CreateFileMapping(INVALID_HANDLE_VALUE, NULL,
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PAGE_EXECUTE_READWRITE, 0, kSize, NULL);
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if (mapping == NULL)
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return 1;
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uint8_t* execution_buffer = MapViewOfFile(
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mapping, FILE_MAP_ALL_ACCESS | FILE_MAP_EXECUTE, 0, 0, 0);
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if (execution_buffer == NULL)
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return 1;
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#endif
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// verify you can copy and execute a function
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pfunc f1 = (pfunc)memcpy_f(execution_buffer, func1, kSize);
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__clear_cache(execution_buffer, execution_buffer + kSize);
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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, kSize);
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__clear_cache(execution_buffer, execution_buffer + kSize);
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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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