/* * 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 "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