mirror of
https://github.com/reactos/reactos.git
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150 lines
3.2 KiB
C
150 lines
3.2 KiB
C
/*
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* Mesa 3-D graphics library
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* Version: 6.5
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*
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* Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/**
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* \file execmem.c
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* Functions for allocating executable memory.
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*
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* \author Keith Whitwell
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*/
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#include <precomp.h>
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#if defined(__linux__) || defined(__OpenBSD__) || defined(_NetBSD__) || defined(__sun)
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/*
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* Allocate a large block of memory which can hold code then dole it out
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* in pieces by means of the generic memory manager code.
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*/
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#include <unistd.h>
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#include <sys/mman.h>
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#ifdef MESA_SELINUX
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#include <selinux/selinux.h>
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#endif
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#ifndef MAP_ANONYMOUS
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#define MAP_ANONYMOUS MAP_ANON
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#endif
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#define EXEC_HEAP_SIZE (10*1024*1024)
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_glthread_DECLARE_STATIC_MUTEX(exec_mutex);
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static struct mem_block *exec_heap = NULL;
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static unsigned char *exec_mem = NULL;
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static int
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init_heap(void)
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{
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#ifdef MESA_SELINUX
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if (is_selinux_enabled()) {
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if (!security_get_boolean_active("allow_execmem") ||
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!security_get_boolean_pending("allow_execmem"))
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return 0;
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}
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#endif
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if (!exec_heap)
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exec_heap = mmInit( 0, EXEC_HEAP_SIZE );
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if (!exec_mem)
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exec_mem = mmap(NULL, EXEC_HEAP_SIZE, PROT_EXEC | PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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return (exec_mem != MAP_FAILED);
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}
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void *
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_mesa_exec_malloc(GLuint size)
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{
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struct mem_block *block = NULL;
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void *addr = NULL;
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_glthread_LOCK_MUTEX(exec_mutex);
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if (!init_heap())
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goto bail;
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if (exec_heap) {
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size = (size + 31) & ~31;
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block = mmAllocMem( exec_heap, size, 32, 0 );
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}
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if (block)
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addr = exec_mem + block->ofs;
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else
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printf("_mesa_exec_malloc failed\n");
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bail:
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_glthread_UNLOCK_MUTEX(exec_mutex);
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return addr;
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}
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void
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_mesa_exec_free(void *addr)
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{
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_glthread_LOCK_MUTEX(exec_mutex);
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if (exec_heap) {
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struct mem_block *block = mmFindBlock(exec_heap, (unsigned char *)addr - exec_mem);
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if (block)
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mmFreeMem(block);
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}
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_glthread_UNLOCK_MUTEX(exec_mutex);
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}
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#else
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/*
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* Just use regular memory.
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*/
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void *
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_mesa_exec_malloc(GLuint size)
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{
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return malloc( size );
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}
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void
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_mesa_exec_free(void *addr)
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{
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free(addr);
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}
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#endif
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