diff options
Diffstat (limited to 'contrib/compiler-rt/lib/enable_execute_stack.c')
-rw-r--r-- | contrib/compiler-rt/lib/enable_execute_stack.c | 59 |
1 files changed, 0 insertions, 59 deletions
diff --git a/contrib/compiler-rt/lib/enable_execute_stack.c b/contrib/compiler-rt/lib/enable_execute_stack.c deleted file mode 100644 index 278ca246f537..000000000000 --- a/contrib/compiler-rt/lib/enable_execute_stack.c +++ /dev/null @@ -1,59 +0,0 @@ -/* ===-- enable_execute_stack.c - Implement __enable_execute_stack ---------=== - * - * The LLVM Compiler Infrastructure - * - * This file is dual licensed under the MIT and the University of Illinois Open - * Source Licenses. See LICENSE.TXT for details. - * - * ===----------------------------------------------------------------------=== - */ - -#include "int_lib.h" - -#include <sys/mman.h> - -/* #include "config.h" - * FIXME: CMake - include when cmake system is ready. - * Remove #define HAVE_SYSCONF 1 line. - */ -#define HAVE_SYSCONF 1 - -#ifndef __APPLE__ -#include <unistd.h> -#endif /* __APPLE__ */ - -#if __LP64__ - #define TRAMPOLINE_SIZE 48 -#else - #define TRAMPOLINE_SIZE 40 -#endif - -/* - * The compiler generates calls to __enable_execute_stack() when creating - * trampoline functions on the stack for use with nested functions. - * It is expected to mark the page(s) containing the address - * and the next 48 bytes as executable. Since the stack is normally rw- - * that means changing the protection on those page(s) to rwx. - */ - -void __enable_execute_stack(void* addr) -{ - -#if __APPLE__ - /* On Darwin, pagesize is always 4096 bytes */ - const uintptr_t pageSize = 4096; -#elif !defined(HAVE_SYSCONF) -#error "HAVE_SYSCONF not defined! See enable_execute_stack.c" -#else - const uintptr_t pageSize = sysconf(_SC_PAGESIZE); -#endif /* __APPLE__ */ - - const uintptr_t pageAlignMask = ~(pageSize-1); - uintptr_t p = (uintptr_t)addr; - unsigned char* startPage = (unsigned char*)(p & pageAlignMask); - unsigned char* endPage = (unsigned char*)((p+TRAMPOLINE_SIZE+pageSize) & pageAlignMask); - size_t length = endPage - startPage; - (void) mprotect((void *)startPage, length, PROT_READ | PROT_WRITE | PROT_EXEC); -} - - |