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/*
* Stack-less Just-In-Time compiler
*
* Copyright Zoltan Herczeg (hzmester@freemail.hu). All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/mman.h>
/*
On macOS systems, returns MAP_JIT if it is defined _and_ we're running on a
version where it's OK to have more than one JIT block or where MAP_JIT is
required.
On non-macOS systems, returns MAP_JIT if it is defined.
*/
#include <TargetConditionals.h>
#if (defined(TARGET_OS_OSX) && TARGET_OS_OSX) || (TARGET_OS_MAC && !TARGET_OS_IPHONE)
#if defined(SLJIT_CONFIG_X86) && SLJIT_CONFIG_X86
#include <sys/utsname.h>
#include <stdlib.h>
#define SLJIT_MAP_JIT (get_map_jit_flag())
#define SLJIT_UPDATE_WX_FLAGS(from, to, enable_exec)
static SLJIT_INLINE int get_map_jit_flag(void)
{
size_t page_size;
void *ptr;
struct utsname name;
static int map_jit_flag = -1;
if (map_jit_flag < 0) {
map_jit_flag = 0;
uname(&name);
/* Kernel version for 10.14.0 (Mojave) or later */
if (atoi(name.release) >= 18) {
page_size = get_page_alignment() + 1;
/* Only use MAP_JIT if a hardened runtime is used */
ptr = mmap(NULL, page_size, PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANON, -1, 0);
if (ptr != MAP_FAILED)
munmap(ptr, page_size);
else
map_jit_flag = MAP_JIT;
}
}
return map_jit_flag;
}
#elif defined(SLJIT_CONFIG_ARM) && SLJIT_CONFIG_ARM
#include <AvailabilityMacros.h>
#include <pthread.h>
#define SLJIT_MAP_JIT (MAP_JIT)
#define SLJIT_UPDATE_WX_FLAGS(from, to, enable_exec) \
apple_update_wx_flags(enable_exec)
static SLJIT_INLINE void apple_update_wx_flags(sljit_s32 enable_exec)
{
#if MAC_OS_X_VERSION_MIN_REQUIRED < 110000
if (__builtin_available(macos 11, *))
#endif /* BigSur */
pthread_jit_write_protect_np(enable_exec);
}
#elif defined(SLJIT_CONFIG_PPC) && SLJIT_CONFIG_PPC
#define SLJIT_MAP_JIT (0)
#define SLJIT_UPDATE_WX_FLAGS(from, to, enable_exec)
#else
#error "Unsupported architecture"
#endif /* SLJIT_CONFIG */
#else /* !TARGET_OS_OSX */
#ifdef MAP_JIT
#define SLJIT_MAP_JIT (MAP_JIT)
#else
#define SLJIT_MAP_JIT (0)
#endif
#endif /* TARGET_OS_OSX */
static SLJIT_INLINE void* alloc_chunk(sljit_uw size)
{
void *retval;
int prot = PROT_READ | PROT_WRITE | PROT_EXEC;
int flags = MAP_PRIVATE;
int fd = -1;
flags |= MAP_ANON | SLJIT_MAP_JIT;
retval = mmap(NULL, size, prot, flags, fd, 0);
if (retval == MAP_FAILED)
return NULL;
SLJIT_UPDATE_WX_FLAGS(retval, (uint8_t *)retval + size, 0);
return retval;
}
static SLJIT_INLINE void free_chunk(void *chunk, sljit_uw size)
{
munmap(chunk, size);
}
#include "sljitExecAllocatorCore.c"
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