2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 * \file glapi_entrypoint.c
28 * Arch-specific code for manipulating GL API entrypoints (dispatch stubs).
32 #ifdef HAVE_DIX_CONFIG_H
33 #include <dix-config.h>
34 #include "glapi/mesa.h"
36 #include "main/glheader.h"
37 #include "main/compiler.h"
40 #include "glapi/glapi.h"
41 #include "glapi/glapi_priv.h"
42 #include "mapi/u_execmem.h"
47 #if defined( GLX_USE_TLS )
48 extern GLubyte gl_dispatch_functions_start
[];
49 extern GLubyte gl_dispatch_functions_end
[];
51 extern const GLubyte gl_dispatch_functions_start
[];
54 #endif /* USE_X86_ASM */
57 #if defined(DISPATCH_FUNCTION_SIZE)
60 get_entrypoint_address(unsigned int functionOffset
)
62 return (_glapi_proc
) (gl_dispatch_functions_start
63 + (DISPATCH_FUNCTION_SIZE
* functionOffset
));
69 #if defined(USE_X86_ASM)
72 * Perform platform-specific GL API entry-point fixups.
75 init_glapi_relocs( void )
77 #if defined(GLX_USE_TLS) && !defined(GLX_X86_READONLY_TEXT)
78 extern unsigned long _x86_get_dispatch(void);
79 char run_time_patch
[] = {
80 0x65, 0xa1, 0, 0, 0, 0 /* movl %gs:0,%eax */
82 GLuint
*offset
= (GLuint
*) &run_time_patch
[2]; /* 32-bits for x86/32 */
83 const GLubyte
* const get_disp
= (const GLubyte
*) run_time_patch
;
84 GLubyte
* curr_func
= (GLubyte
*) gl_dispatch_functions_start
;
86 *offset
= _x86_get_dispatch();
87 while ( curr_func
!= (GLubyte
*) gl_dispatch_functions_end
) {
88 (void) memcpy( curr_func
, get_disp
, sizeof(run_time_patch
));
89 curr_func
+= DISPATCH_FUNCTION_SIZE
;
96 * Generate a dispatch function (entrypoint) which jumps through
97 * the given slot number (offset) in the current dispatch table.
98 * We need assembly language in order to accomplish this.
101 generate_entrypoint(unsigned int functionOffset
)
103 /* 32 is chosen as something of a magic offset. For x86, the dispatch
104 * at offset 32 is the first one where the offset in the
105 * "jmp OFFSET*4(%eax)" can't be encoded in a single byte.
107 const GLubyte
* const template_func
= gl_dispatch_functions_start
108 + (DISPATCH_FUNCTION_SIZE
* 32);
109 GLubyte
* const code
= (GLubyte
*) u_execmem_alloc(DISPATCH_FUNCTION_SIZE
);
112 if ( code
!= NULL
) {
113 (void) memcpy(code
, template_func
, DISPATCH_FUNCTION_SIZE
);
114 fill_in_entrypoint_offset( (_glapi_proc
) code
, functionOffset
);
117 return (_glapi_proc
) code
;
122 * This function inserts a new dispatch offset into the assembly language
123 * stub that was generated with the preceeding function.
126 fill_in_entrypoint_offset(_glapi_proc entrypoint
, unsigned int offset
)
128 GLubyte
* const code
= (GLubyte
*) entrypoint
;
130 #if defined(GLX_USE_TLS)
131 *((unsigned int *)(code
+ 8)) = 4 * offset
;
132 #elif defined(THREADS)
133 *((unsigned int *)(code
+ 11)) = 4 * offset
;
134 *((unsigned int *)(code
+ 22)) = 4 * offset
;
136 *((unsigned int *)(code
+ 7)) = 4 * offset
;
141 #elif defined(USE_SPARC_ASM)
143 extern void __glapi_sparc_icache_flush(unsigned int *);
146 init_glapi_relocs( void )
148 #if defined(PTHREADS) || defined(GLX_USE_TLS)
149 static const unsigned int template[] = {
151 0x05000000, /* sethi %hi(_glapi_tls_Dispatch), %g2 */
152 0x8730e00a, /* srl %g3, 10, %g3 */
153 0x8410a000, /* or %g2, %lo(_glapi_tls_Dispatch), %g2 */
155 0xc259c002, /* ldx [%g7 + %g2], %g1 */
156 0xc2584003, /* ldx [%g1 + %g3], %g1 */
158 0xc201c002, /* ld [%g7 + %g2], %g1 */
159 0xc2004003, /* ld [%g1 + %g3], %g1 */
161 0x81c04000, /* jmp %g1 */
162 0x01000000, /* nop */
165 0x03000000, /* 64-bit 0x00 --> sethi %hh(_glapi_Dispatch), %g1 */
166 0x05000000, /* 64-bit 0x04 --> sethi %lm(_glapi_Dispatch), %g2 */
167 0x82106000, /* 64-bit 0x08 --> or %g1, %hm(_glapi_Dispatch), %g1 */
168 0x8730e00a, /* 64-bit 0x0c --> srl %g3, 10, %g3 */
169 0x83287020, /* 64-bit 0x10 --> sllx %g1, 32, %g1 */
170 0x82004002, /* 64-bit 0x14 --> add %g1, %g2, %g1 */
171 0xc2586000, /* 64-bit 0x18 --> ldx [%g1 + %lo(_glapi_Dispatch)], %g1 */
173 0x03000000, /* 32-bit 0x00 --> sethi %hi(_glapi_Dispatch), %g1 */
174 0x8730e00a, /* 32-bit 0x04 --> srl %g3, 10, %g3 */
175 0xc2006000, /* 32-bit 0x08 --> ld [%g1 + %lo(_glapi_Dispatch)], %g1 */
177 0x80a06000, /* --> cmp %g1, 0 */
178 0x02800005, /* --> be +4*5 */
179 0x01000000, /* --> nop */
181 0xc2584003, /* 64-bit --> ldx [%g1 + %g3], %g1 */
183 0xc2004003, /* 32-bit --> ld [%g1 + %g3], %g1 */
185 0x81c04000, /* --> jmp %g1 */
186 0x01000000, /* --> nop */
188 0x9de3bf80, /* 64-bit --> save %sp, -128, %sp */
190 0x9de3bfc0, /* 32-bit --> save %sp, -64, %sp */
192 0xa0100003, /* --> mov %g3, %l0 */
193 0x40000000, /* --> call _glapi_get_dispatch */
194 0x01000000, /* --> nop */
195 0x82100008, /* --> mov %o0, %g1 */
196 0x86100010, /* --> mov %l0, %g3 */
197 0x10bffff7, /* --> ba -4*9 */
198 0x81e80000, /* --> restore */
202 extern unsigned int __glapi_sparc_tls_stub
;
203 extern unsigned long __glapi_sparc_get_dispatch(void);
204 unsigned int *code
= &__glapi_sparc_tls_stub
;
205 unsigned long dispatch
= __glapi_sparc_get_dispatch();
207 extern unsigned int __glapi_sparc_pthread_stub
;
208 unsigned int *code
= &__glapi_sparc_pthread_stub
;
209 unsigned long dispatch
= (unsigned long) &_glapi_Dispatch
;
210 unsigned long call_dest
= (unsigned long ) &_glapi_get_dispatch
;
215 code
[0] = template[0] | (dispatch
>> 10);
216 code
[1] = template[1];
217 __glapi_sparc_icache_flush(&code
[0]);
218 code
[2] = template[2] | (dispatch
& 0x3ff);
219 code
[3] = template[3];
220 __glapi_sparc_icache_flush(&code
[2]);
221 code
[4] = template[4];
222 code
[5] = template[5];
223 __glapi_sparc_icache_flush(&code
[4]);
224 code
[6] = template[6];
225 __glapi_sparc_icache_flush(&code
[6]);
227 #if defined(__arch64__)
228 code
[0] = template[0] | (dispatch
>> (32 + 10));
229 code
[1] = template[1] | ((dispatch
& 0xffffffff) >> 10);
230 __glapi_sparc_icache_flush(&code
[0]);
231 code
[2] = template[2] | ((dispatch
>> 32) & 0x3ff);
232 code
[3] = template[3];
233 __glapi_sparc_icache_flush(&code
[2]);
234 code
[4] = template[4];
235 code
[5] = template[5];
236 __glapi_sparc_icache_flush(&code
[4]);
237 code
[6] = template[6] | (dispatch
& 0x3ff);
240 code
[0] = template[0] | (dispatch
>> 10);
241 code
[1] = template[1];
242 __glapi_sparc_icache_flush(&code
[0]);
243 code
[2] = template[2] | (dispatch
& 0x3ff);
246 code
[idx
+ 0] = template[idx
+ 0];
247 __glapi_sparc_icache_flush(&code
[idx
- 1]);
248 code
[idx
+ 1] = template[idx
+ 1];
249 code
[idx
+ 2] = template[idx
+ 2];
250 __glapi_sparc_icache_flush(&code
[idx
+ 1]);
251 code
[idx
+ 3] = template[idx
+ 3];
252 code
[idx
+ 4] = template[idx
+ 4];
253 __glapi_sparc_icache_flush(&code
[idx
+ 3]);
254 code
[idx
+ 5] = template[idx
+ 5];
255 code
[idx
+ 6] = template[idx
+ 6];
256 __glapi_sparc_icache_flush(&code
[idx
+ 5]);
257 code
[idx
+ 7] = template[idx
+ 7];
258 code
[idx
+ 8] = template[idx
+ 8] |
259 (((call_dest
- ((unsigned long) &code
[idx
+ 8]))
261 __glapi_sparc_icache_flush(&code
[idx
+ 7]);
262 code
[idx
+ 9] = template[idx
+ 9];
263 code
[idx
+ 10] = template[idx
+ 10];
264 __glapi_sparc_icache_flush(&code
[idx
+ 9]);
265 code
[idx
+ 11] = template[idx
+ 11];
266 code
[idx
+ 12] = template[idx
+ 12];
267 __glapi_sparc_icache_flush(&code
[idx
+ 11]);
268 code
[idx
+ 13] = template[idx
+ 13];
269 __glapi_sparc_icache_flush(&code
[idx
+ 13]);
276 generate_entrypoint(GLuint functionOffset
)
278 #if defined(PTHREADS) || defined(GLX_USE_TLS)
279 static const unsigned int template[] = {
280 0x07000000, /* sethi %hi(0), %g3 */
281 0x8210000f, /* mov %o7, %g1 */
282 0x40000000, /* call */
283 0x9e100001, /* mov %g1, %o7 */
286 extern unsigned int __glapi_sparc_tls_stub
;
287 unsigned long call_dest
= (unsigned long ) &__glapi_sparc_tls_stub
;
289 extern unsigned int __glapi_sparc_pthread_stub
;
290 unsigned long call_dest
= (unsigned long ) &__glapi_sparc_pthread_stub
;
292 unsigned int *code
= (unsigned int *) u_execmem_alloc(sizeof(template));
294 code
[0] = template[0] | (functionOffset
& 0x3fffff);
295 code
[1] = template[1];
296 __glapi_sparc_icache_flush(&code
[0]);
297 code
[2] = template[2] |
298 (((call_dest
- ((unsigned long) &code
[2]))
300 code
[3] = template[3];
301 __glapi_sparc_icache_flush(&code
[2]);
303 return (_glapi_proc
) code
;
309 fill_in_entrypoint_offset(_glapi_proc entrypoint
, GLuint offset
)
311 unsigned int *code
= (unsigned int *) entrypoint
;
313 code
[0] &= ~0x3fffff;
314 code
[0] |= (offset
* sizeof(void *)) & 0x3fffff;
315 __glapi_sparc_icache_flush(&code
[0]);
319 #else /* USE_*_ASM */
322 init_glapi_relocs( void )
328 generate_entrypoint(GLuint functionOffset
)
330 (void) functionOffset
;
336 fill_in_entrypoint_offset(_glapi_proc entrypoint
, GLuint offset
)
338 /* an unimplemented architecture */
343 #endif /* USE_*_ASM */
347 init_glapi_relocs_once( void )
349 #if defined(PTHREADS) || defined(GLX_USE_TLS)
350 static pthread_once_t once_control
= PTHREAD_ONCE_INIT
;
351 pthread_once( & once_control
, init_glapi_relocs
);