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/**************************************************************************
*
* 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 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 exemem.c
* Functions for allocating executable memory.
*
* \author Keith Whitwell
*/
#include "pipe/p_compiler.h"
#include "util/u_debug.h"
#include "os/os_thread.h"
#include "util/u_memory.h"
#include "rtasm_execmem.h"
#if defined(PIPE_OS_BSD)
#define MAP_ANONYMOUS MAP_ANON
#endif
#if defined(PIPE_OS_WINDOWS)
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN 1
#endif
#include <windows.h>
#endif
#if defined(PIPE_OS_LINUX) || defined(PIPE_OS_BSD) || defined(PIPE_OS_SOLARIS)
/*
* 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"
#define EXEC_HEAP_SIZE (10*1024*1024)
pipe_static_mutex(exec_mutex);
static struct mem_block *exec_heap = NULL;
static unsigned char *exec_mem = NULL;
static void
init_heap(void)
{
if (!exec_heap)
exec_heap = u_mmInit( 0, EXEC_HEAP_SIZE );
if (!exec_mem)
exec_mem = (unsigned char *) mmap(0, EXEC_HEAP_SIZE,
PROT_EXEC | PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
}
void *
rtasm_exec_malloc(size_t size)
{
struct mem_block *block = NULL;
void *addr = NULL;
pipe_mutex_lock(exec_mutex);
init_heap();
if (exec_heap) {
size = (size + 31) & ~31; /* next multiple of 32 bytes */
block = u_mmAllocMem( exec_heap, size, 5, 0 ); /* 5 -> 32-byte alignment */
}
if (block)
addr = exec_mem + block->ofs;
else
debug_printf("rtasm_exec_malloc failed\n");
pipe_mutex_unlock(exec_mutex);
return addr;
}
void
rtasm_exec_free(void *addr)
{
pipe_mutex_lock(exec_mutex);
if (exec_heap) {
struct mem_block *block = u_mmFindBlock(exec_heap, (unsigned char *)addr - exec_mem);
if (block)
u_mmFreeMem(block);
}
pipe_mutex_unlock(exec_mutex);
}
#elif defined(PIPE_OS_WINDOWS)
/*
* Avoid Data Execution Prevention.
*/
void *
rtasm_exec_malloc(size_t size)
{
return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
}
void
rtasm_exec_free(void *addr)
{
VirtualFree(addr, 0, MEM_RELEASE);
}
#else
/*
* Just use regular memory.
*/
void *
rtasm_exec_malloc(size_t size)
{
return MALLOC( size );
}
void
rtasm_exec_free(void *addr)
{
FREE(addr);
}
#endif
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