114 lines
3.5 KiB
C
114 lines
3.5 KiB
C
/*
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* Stack-less Just-In-Time compiler
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*
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* Copyright 2009-2012 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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/*
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This file contains a simple executable memory allocator where the
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allocated regions are not writable and executable in the same time.
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This allocator usually uses more memory than sljitExecAllocator.
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*/
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#ifdef _WIN32
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static SLJIT_INLINE void* alloc_chunk(sljit_uw size)
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{
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return VirtualAlloc(NULL, size, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
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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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SLJIT_UNUSED_ARG(size);
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VirtualFree(chunk, 0, MEM_RELEASE);
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}
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static SLJIT_INLINE void enable_exec_permission(void* chunk, sljit_uw size)
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{
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sljit_uw *uw_ptr = (sljit_uw *)ptr;
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VirtualProtect(chunk, size, PAGE_EXECUTE_READ, NULL);
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}
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#else
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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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#ifdef MAP_ANON
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retval = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
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#else
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if (dev_zero < 0) {
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if (open_dev_zero())
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return NULL;
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}
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retval = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, dev_zero, 0);
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#endif
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return (retval != MAP_FAILED) ? retval : NULL;
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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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static SLJIT_INLINE void enable_exec_permission(void* chunk, sljit_uw size)
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{
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sljit_uw *uw_ptr = (sljit_uw *)chunk;
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mprotect(uw_ptr - 1, size + sizeof(sljit_uw), PROT_READ | PROT_EXEC);
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}
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#endif
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/* --------------------------------------------------------------------- */
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/* Common functions */
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/* --------------------------------------------------------------------- */
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SLJIT_API_FUNC_ATTRIBUTE void* sljit_malloc_exec(sljit_uw size)
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{
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sljit_uw *ptr = (sljit_uw *)alloc_chunk(size + sizeof (sljit_uw));
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*ptr = size;
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return (void*)(ptr + 1);
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}
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SLJIT_API_FUNC_ATTRIBUTE void sljit_free_exec(void* ptr)
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{
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sljit_uw *uw_ptr = (sljit_uw *)ptr;
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free_chunk(uw_ptr - 1, uw_ptr[-1]);
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}
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SLJIT_API_FUNC_ATTRIBUTE void sljit_enable_exec(void* from, void *to)
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{
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enable_exec_permission(from, ((sljit_u8 *)to) - ((sljit_u8 *)from));
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}
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SLJIT_API_FUNC_ATTRIBUTE void sljit_free_unused_memory_exec(void)
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{
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}
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