| 0,0 → 1,173 |
|---|
| /************************************************************************** |
| * |
| * 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 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" |
| |
| #ifndef MAP_ANONYMOUS |
| #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) || defined(PIPE_OS_HAIKU) || defined(PIPE_OS_CYGWIN) |
| |
| |
| /* |
| * 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 int |
| 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); |
| |
| return (exec_mem != MAP_FAILED); |
| } |
| |
| |
| void * |
| rtasm_exec_malloc(size_t size) |
| { |
| struct mem_block *block = NULL; |
| void *addr = NULL; |
| |
| pipe_mutex_lock(exec_mutex); |
| |
| if (!init_heap()) |
| goto bail; |
| |
| 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"); |
| |
| bail: |
| 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 |