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89 lines
2.7 KiB
C
89 lines
2.7 KiB
C
/*
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* Stack-less Just-In-Time compiler
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*
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* Copyright Zoltan Herczeg (hzmester@freemail.hu). All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification, are
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* permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/mman.h>
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#include <sys/procctl.h>
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#ifdef PROC_WXMAP_CTL
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static SLJIT_INLINE int sljit_is_wx_block(void)
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{
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static int wx_block = -1;
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if (wx_block < 0) {
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int sljit_wx_enable = PROC_WX_MAPPINGS_PERMIT;
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wx_block = !!procctl(P_PID, 0, PROC_WXMAP_CTL, &sljit_wx_enable);
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}
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return wx_block;
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}
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#define SLJIT_IS_WX_BLOCK sljit_is_wx_block()
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#else /* !PROC_WXMAP_CTL */
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#define SLJIT_IS_WX_BLOCK (1)
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#endif /* PROC_WXMAP_CTL */
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static SLJIT_INLINE void* alloc_chunk(sljit_uw size)
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{
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void *retval;
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int prot = PROT_READ | PROT_WRITE | PROT_EXEC;
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int flags = MAP_PRIVATE;
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int fd = -1;
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#ifdef PROT_MAX
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prot |= PROT_MAX(prot);
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#endif
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#ifdef MAP_ANON
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flags |= MAP_ANON;
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#else /* !MAP_ANON */
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if (SLJIT_UNLIKELY((dev_zero < 0) && open_dev_zero()))
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return NULL;
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fd = dev_zero;
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#endif /* MAP_ANON */
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retry:
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retval = mmap(NULL, size, prot, flags, fd, 0);
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if (retval == MAP_FAILED) {
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if (!SLJIT_IS_WX_BLOCK)
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goto retry;
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return NULL;
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}
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/* HardenedBSD's mmap lies, so check permissions again. */
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if (mprotect(retval, size, PROT_READ | PROT_WRITE | PROT_EXEC) < 0) {
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munmap(retval, size);
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return NULL;
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}
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return retval;
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}
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static SLJIT_INLINE void free_chunk(void *chunk, sljit_uw size)
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{
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munmap(chunk, size);
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}
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#include "sljitExecAllocatorCore.c"
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