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//===-- enable_execute_stack_test.c - Test __enable_execute_stack ----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <sys/mman.h>
extern void __clear_cache(void* start, void* end);
extern void __enable_execute_stack(void* addr);
typedef int (*pfunc)(void);
int func1()
{
return 1;
}
int func2()
{
return 2;
}
int main()
{
unsigned char execution_buffer[128];
// mark stack page containing execution_buffer to be executable
__enable_execute_stack(execution_buffer);
// verify you can copy and execute a function
memcpy(execution_buffer, &func1, 128);
__clear_cache(execution_buffer, &execution_buffer[128]);
pfunc f1 = (pfunc)execution_buffer;
if ( (*f1)() != 1 )
return 1;
// verify you can overwrite a function with another
memcpy(execution_buffer, &func2, 128);
__clear_cache(execution_buffer, &execution_buffer[128]);
pfunc f2 = (pfunc)execution_buffer;
if ( (*f2)() != 2 )
return 1;
return 0;
}
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