| 0,0 → 1,154 |
|---|
| /* |
| * 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 "imports.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 "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 = 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(GLuint 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 = mmAllocMem( exec_heap, size, 32, 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 = mmFindBlock(exec_heap, (unsigned char *)addr - exec_mem); |
| |
| if (block) |
| mmFreeMem(block); |
| } |
| |
| mtx_unlock(&exec_mutex); |
| } |
| |
| |
| #else |
| |
| /* |
| * Just use regular memory. |
| */ |
| |
| void * |
| _mesa_exec_malloc(GLuint size) |
| { |
| return malloc( size ); |
| } |
| |
| |
| void |
| _mesa_exec_free(void *addr) |
| { |
| free(addr); |
| } |
| |
| |
| #endif |