diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/mesa/SConscript | 1 | ||||
| -rw-r--r-- | src/mesa/glapi/glapi_entrypoint.c | 4 | ||||
| -rw-r--r-- | src/mesa/glapi/glapi_execmem.c | 127 | ||||
| -rw-r--r-- | src/mesa/glapi/glapi_getproc.c | 6 | ||||
| -rw-r--r-- | src/mesa/glapi/glapi_priv.h | 25 | ||||
| -rw-r--r-- | src/mesa/sources.mak | 1 |
6 files changed, 156 insertions, 8 deletions
diff --git a/src/mesa/SConscript b/src/mesa/SConscript index e80ec5ee880..86da6f58bd8 100644 --- a/src/mesa/SConscript +++ b/src/mesa/SConscript @@ -250,6 +250,7 @@ if env['platform'] != 'winddk': 'glapi/glapi.c', 'glapi/glapi_dispatch.c', 'glapi/glapi_entrypoint.c', + 'glapi/glapi_execmem.c', 'glapi/glapi_getproc.c', 'glapi/glapi_nop.c', 'glapi/glthread.c', diff --git a/src/mesa/glapi/glapi_entrypoint.c b/src/mesa/glapi/glapi_entrypoint.c index 3256867b167..c4f43f66a18 100644 --- a/src/mesa/glapi/glapi_entrypoint.c +++ b/src/mesa/glapi/glapi_entrypoint.c @@ -105,7 +105,7 @@ generate_entrypoint(GLuint functionOffset) */ const GLubyte * const template_func = gl_dispatch_functions_start + (DISPATCH_FUNCTION_SIZE * 32); - GLubyte * const code = (GLubyte *) malloc(DISPATCH_FUNCTION_SIZE); + GLubyte * const code = (GLubyte *) _glapi_exec_malloc(DISPATCH_FUNCTION_SIZE); if ( code != NULL ) { @@ -288,7 +288,7 @@ generate_entrypoint(GLuint functionOffset) extern unsigned int __glapi_sparc_pthread_stub; unsigned long call_dest = (unsigned long ) &__glapi_sparc_pthread_stub; #endif - unsigned int *code = (unsigned int *) malloc(sizeof(template)); + unsigned int *code = (unsigned int *) _glapi_exec_malloc(sizeof(template)); if (code) { code[0] = template[0] | (functionOffset & 0x3fffff); code[1] = template[1]; diff --git a/src/mesa/glapi/glapi_execmem.c b/src/mesa/glapi/glapi_execmem.c new file mode 100644 index 00000000000..6a1fac597f3 --- /dev/null +++ b/src/mesa/glapi/glapi_execmem.c @@ -0,0 +1,127 @@ +/* + * Mesa 3-D graphics library + * Version: 6.5 + * + * 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 + * BRIAN PAUL 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 glapi_execmem.c + * + * Function for allocating executable memory for dispatch stubs. + * + * Copied from main/execmem.c and simplified for dispatch stubs. + */ + + +#ifdef HAVE_DIX_CONFIG_H +#include <dix-config.h> +#include "glapi/mesa.h" +#else +#include "main/compiler.h" +#endif + +#include "glapi/glthread.h" + + +#if defined(__linux__) || defined(__OpenBSD__) || defined(_NetBSD__) || defined(__sun) + +#include <unistd.h> +#include <sys/mman.h> + +#ifdef MESA_SELINUX +#include <selinux/selinux.h> +#endif + + +#ifndef MAP_ANONYMOUS +#define MAP_ANONYMOUS MAP_ANON +#endif + + +#define EXEC_MAP_SIZE (4*1024) + +_glthread_DECLARE_STATIC_MUTEX(exec_mutex); + +static unsigned int head = 0; + +static unsigned char *exec_mem = NULL; + + +/* + * Dispatch stubs are of fixed size and never freed. Thus, we do not need to + * overlay a heap, we just mmap a page and manage through an index. + */ + +static int +init_map(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_mem) + exec_mem = mmap(NULL, EXEC_MAP_SIZE, PROT_EXEC | PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); + + return (exec_mem != MAP_FAILED); +} + + +void * +_glapi_exec_malloc(unsigned int size) +{ + void *addr = NULL; + + _glthread_LOCK_MUTEX(exec_mutex); + + if (!init_map()) + goto bail; + + /* free space check, assumes no integer overflow */ + if (head + size > EXEC_MAP_SIZE) + goto bail; + + /* allocation, assumes proper addr and size alignement */ + addr = exec_mem + head; + head += size; + +bail: + _glthread_UNLOCK_MUTEX(exec_mutex); + + return addr; +} + + +#else + +void * +_glapi_exec_malloc(unsigned int size) +{ + return malloc(size); +} + + +#endif diff --git a/src/mesa/glapi/glapi_getproc.c b/src/mesa/glapi/glapi_getproc.c index 295657875dc..c73e8dd3b04 100644 --- a/src/mesa/glapi/glapi_getproc.c +++ b/src/mesa/glapi/glapi_getproc.c @@ -200,12 +200,6 @@ struct _glapi_function { }; -/* - * Number of extension functions which we can dynamically add at runtime. - */ -#define MAX_EXTENSION_FUNCS 300 - - static struct _glapi_function ExtEntryTable[MAX_EXTENSION_FUNCS]; static GLuint NumExtEntryPoints = 0; diff --git a/src/mesa/glapi/glapi_priv.h b/src/mesa/glapi/glapi_priv.h index a8516f71a31..0e2de460f2e 100644 --- a/src/mesa/glapi/glapi_priv.h +++ b/src/mesa/glapi/glapi_priv.h @@ -28,6 +28,9 @@ #include "glthread.h" + +/* getproc */ + extern void _glapi_check_table_not_null(const struct _glapi_table *table); @@ -36,6 +39,14 @@ extern void _glapi_check_table(const struct _glapi_table *table); +/* execmem */ + +extern void * +_glapi_exec_malloc(GLuint size); + + +/* entrypoint */ + extern void init_glapi_relocs_once(void); @@ -52,6 +63,9 @@ extern _glapi_proc get_entrypoint_address(GLuint functionOffset); +/** + * Size (in bytes) of dispatch function (entrypoint). + */ #if defined(USE_X86_ASM) # if defined(GLX_USE_TLS) # define DISPATCH_FUNCTION_SIZE 16 @@ -69,4 +83,15 @@ get_entrypoint_address(GLuint functionOffset); #endif +/** + * Number of extension functions which we can dynamically add at runtime. + * + * Number of extension functions is also subject to the size of backing exec + * mem we allocate. For the common case of dispatch stubs with size 16 bytes, + * the two limits will be hit simultaneously. For larger dispatch function + * sizes, MAX_EXTENSION_FUNCS is effectively reduced. + */ +#define MAX_EXTENSION_FUNCS 256 + + #endif diff --git a/src/mesa/sources.mak b/src/mesa/sources.mak index 74885548e5a..d59e24de1f2 100644 --- a/src/mesa/sources.mak +++ b/src/mesa/sources.mak @@ -89,6 +89,7 @@ GLAPI_SOURCES = \ glapi/glapi.c \ glapi/glapi_dispatch.c \ glapi/glapi_entrypoint.c \ + glapi/glapi_execmem.c \ glapi/glapi_getproc.c \ glapi/glapi_nop.c \ glapi/glthread.c |