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/*
* Mesa 3-D graphics library
*
* Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
/**
* \file execmem.c
* Functions for allocating executable memory.
*
* \author Keith Whitwell
*/
#include <stdio.h>
#include "main/glheader.h"
#include "execmem.h"
#include "c11/threads.h"
#if defined(__linux__) || defined(__OpenBSD__) || defined(_NetBSD__) || defined(__sun) || defined(__HAIKU__)
/*
* Allocate a large block of memory which can hold code then dole it out
* in pieces by means of the generic memory manager code.
*/
#include <unistd.h>
#include <sys/mman.h>
#include "util/u_mm.h"
#ifdef MESA_SELINUX
#include <selinux/selinux.h>
#endif
#ifndef MAP_ANONYMOUS
#define MAP_ANONYMOUS MAP_ANON
#endif
#define EXEC_HEAP_SIZE (10*1024*1024)
static mtx_t exec_mutex = _MTX_INITIALIZER_NP;
static struct mem_block *exec_heap = NULL;
static unsigned char *exec_mem = NULL;
static int
init_heap(void)
{
#ifdef MESA_SELINUX
if (is_selinux_enabled()) {
if (!security_get_boolean_active("allow_execmem") ||
!security_get_boolean_pending("allow_execmem"))
return 0;
}
#endif
if (!exec_heap)
exec_heap = u_mmInit( 0, EXEC_HEAP_SIZE );
if (!exec_mem)
exec_mem = mmap(NULL, EXEC_HEAP_SIZE, PROT_EXEC | PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
return (exec_mem != MAP_FAILED);
}
void *
_mesa_exec_malloc(unsigned size)
{
struct mem_block *block = NULL;
void *addr = NULL;
mtx_lock(&exec_mutex);
if (!init_heap())
goto bail;
if (exec_heap) {
size = (size + 31) & ~31;
block = u_mmAllocMem(exec_heap, size, 5, 0);
}
if (block)
addr = exec_mem + block->ofs;
else
printf("_mesa_exec_malloc failed\n");
bail:
mtx_unlock(&exec_mutex);
return addr;
}
void
_mesa_exec_free(void *addr)
{
mtx_lock(&exec_mutex);
if (exec_heap) {
struct mem_block *block = u_mmFindBlock(exec_heap, (unsigned char *)addr - exec_mem);
if (block)
u_mmFreeMem(block);
}
mtx_unlock(&exec_mutex);
}
#else
/*
* Just use regular memory.
*/
void *
_mesa_exec_malloc(unsigned size)
{
return malloc( size );
}
void
_mesa_exec_free(void *addr)
{
free(addr);
}
#endif
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