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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/mman.h>
#include <sys/procctl.h>
#ifdef PROC_WXMAP_CTL
static SLJIT_INLINE int sljit_is_wx_block(void)
{
static int wx_block = -1;
if (wx_block < 0) {
int sljit_wx_enable = PROC_WX_MAPPINGS_PERMIT;
wx_block = !!procctl(P_PID, 0, PROC_WXMAP_CTL, &sljit_wx_enable);
}
return wx_block;
}
#define SLJIT_IS_WX_BLOCK sljit_is_wx_block()
#else /* !PROC_WXMAP_CTL */
#define SLJIT_IS_WX_BLOCK (1)
#endif /* PROC_WXMAP_CTL */
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;
#ifdef PROT_MAX
prot |= PROT_MAX(prot);
#endif
#ifdef MAP_ANON
flags |= MAP_ANON;
#else /* !MAP_ANON */
if (SLJIT_UNLIKELY((dev_zero < 0) && open_dev_zero()))
return NULL;
fd = dev_zero;
#endif /* MAP_ANON */
retry:
retval = mmap(NULL, size, prot, flags, fd, 0);
if (retval == MAP_FAILED) {
if (!SLJIT_IS_WX_BLOCK)
goto retry;
return NULL;
}
/* HardenedBSD's mmap lies, so check permissions again. */
if (mprotect(retval, size, PROT_READ | PROT_WRITE | PROT_EXEC) < 0) {
munmap(retval, size);
return NULL;
}
return retval;
}
static SLJIT_INLINE void free_chunk(void *chunk, sljit_uw size)
{
munmap(chunk, size);
}
#include "sljitExecAllocatorCore.c"
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