forked from OSchip/llvm-project
58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
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//===-- enable_execute_stack_test.c - Test __enable_execute_stack ----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. 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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#include <sys/mman.h>
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extern void __clear_cache(void* start, void* end);
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extern void __enable_execute_stack(void* addr);
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typedef int (*pfunc)(void);
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int func1()
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{
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return 1;
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}
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int func2()
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{
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return 2;
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}
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int main()
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{
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unsigned char execution_buffer[128];
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// mark stack page containing execution_buffer to be executable
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__enable_execute_stack(execution_buffer);
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// verify you can copy and execute a function
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memcpy(execution_buffer, &func1, 128);
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__clear_cache(execution_buffer, &execution_buffer[128]);
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pfunc f1 = (pfunc)execution_buffer;
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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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memcpy(execution_buffer, &func2, 128);
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__clear_cache(execution_buffer, &execution_buffer[128]);
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pfunc f2 = (pfunc)execution_buffer;
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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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