1 /*
2 * Mesa 3-D graphics library
3 * Version: 7.1
4 *
5 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
6 *
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:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
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.
23 */
24
25 /**
26 * \file glapi_entrypoint.c
27 *
28 * Arch-specific code for manipulating GL API entrypoints (dispatch stubs).
29 */
30
31
32 #include "glapi/glapi_priv.h"
33 #include "mapi/u_execmem.h"
34
35
36 #ifdef USE_X86_ASM
37
38 #if defined( GLX_USE_TLS )
39 extern GLubyte gl_dispatch_functions_start[];
40 extern GLubyte gl_dispatch_functions_end[];
41 #else
42 extern const GLubyte gl_dispatch_functions_start[];
43 #endif
44
45 #endif /* USE_X86_ASM */
46
47
48 #if defined(DISPATCH_FUNCTION_SIZE)
49
50 _glapi_proc
get_entrypoint_address(unsigned int functionOffset)51 get_entrypoint_address(unsigned int functionOffset)
52 {
53 return (_glapi_proc) (gl_dispatch_functions_start
54 + (DISPATCH_FUNCTION_SIZE * functionOffset));
55 }
56
57 #endif
58
59
60 #if defined(USE_X86_ASM)
61
62 /**
63 * Perform platform-specific GL API entry-point fixups.
64 */
65 static void
init_glapi_relocs(void)66 init_glapi_relocs( void )
67 {
68 #if defined(GLX_USE_TLS) && !defined(GLX_X86_READONLY_TEXT)
69 extern unsigned long _x86_get_dispatch(void);
70 char run_time_patch[] = {
71 0x65, 0xa1, 0, 0, 0, 0 /* movl %gs:0,%eax */
72 };
73 GLuint *offset = (GLuint *) &run_time_patch[2]; /* 32-bits for x86/32 */
74 const GLubyte * const get_disp = (const GLubyte *) run_time_patch;
75 GLubyte * curr_func = (GLubyte *) gl_dispatch_functions_start;
76
77 *offset = _x86_get_dispatch();
78 while ( curr_func != (GLubyte *) gl_dispatch_functions_end ) {
79 (void) memcpy( curr_func, get_disp, sizeof(run_time_patch));
80 curr_func += DISPATCH_FUNCTION_SIZE;
81 }
82 #endif
83 }
84
85
86 /**
87 * Generate a dispatch function (entrypoint) which jumps through
88 * the given slot number (offset) in the current dispatch table.
89 * We need assembly language in order to accomplish this.
90 */
91 _glapi_proc
generate_entrypoint(unsigned int functionOffset)92 generate_entrypoint(unsigned int functionOffset)
93 {
94 /* 32 is chosen as something of a magic offset. For x86, the dispatch
95 * at offset 32 is the first one where the offset in the
96 * "jmp OFFSET*4(%eax)" can't be encoded in a single byte.
97 */
98 const GLubyte * const template_func = gl_dispatch_functions_start
99 + (DISPATCH_FUNCTION_SIZE * 32);
100 GLubyte * const code = (GLubyte *) u_execmem_alloc(DISPATCH_FUNCTION_SIZE);
101
102
103 if ( code != NULL ) {
104 (void) memcpy(code, template_func, DISPATCH_FUNCTION_SIZE);
105 fill_in_entrypoint_offset( (_glapi_proc) code, functionOffset );
106 }
107
108 return (_glapi_proc) code;
109 }
110
111
112 /**
113 * This function inserts a new dispatch offset into the assembly language
114 * stub that was generated with the preceeding function.
115 */
116 void
fill_in_entrypoint_offset(_glapi_proc entrypoint,unsigned int offset)117 fill_in_entrypoint_offset(_glapi_proc entrypoint, unsigned int offset)
118 {
119 GLubyte * const code = (GLubyte *) entrypoint;
120
121 #if defined(GLX_USE_TLS)
122 *((unsigned int *)(code + 8)) = 4 * offset;
123 #elif defined(THREADS)
124 *((unsigned int *)(code + 11)) = 4 * offset;
125 *((unsigned int *)(code + 22)) = 4 * offset;
126 #else
127 *((unsigned int *)(code + 7)) = 4 * offset;
128 #endif
129 }
130
131
132 #elif defined(USE_SPARC_ASM)
133
134 extern void __glapi_sparc_icache_flush(unsigned int *);
135
136 static void
init_glapi_relocs(void)137 init_glapi_relocs( void )
138 {
139 #if defined(HAVE_PTHREAD) || defined(GLX_USE_TLS)
140 static const unsigned int template[] = {
141 #ifdef GLX_USE_TLS
142 0x05000000, /* sethi %hi(_glapi_tls_Dispatch), %g2 */
143 0x8730e00a, /* srl %g3, 10, %g3 */
144 0x8410a000, /* or %g2, %lo(_glapi_tls_Dispatch), %g2 */
145 #ifdef __arch64__
146 0xc259c002, /* ldx [%g7 + %g2], %g1 */
147 0xc2584003, /* ldx [%g1 + %g3], %g1 */
148 #else
149 0xc201c002, /* ld [%g7 + %g2], %g1 */
150 0xc2004003, /* ld [%g1 + %g3], %g1 */
151 #endif
152 0x81c04000, /* jmp %g1 */
153 0x01000000, /* nop */
154 #else
155 #ifdef __arch64__
156 0x03000000, /* 64-bit 0x00 --> sethi %hh(_glapi_Dispatch), %g1 */
157 0x05000000, /* 64-bit 0x04 --> sethi %lm(_glapi_Dispatch), %g2 */
158 0x82106000, /* 64-bit 0x08 --> or %g1, %hm(_glapi_Dispatch), %g1 */
159 0x8730e00a, /* 64-bit 0x0c --> srl %g3, 10, %g3 */
160 0x83287020, /* 64-bit 0x10 --> sllx %g1, 32, %g1 */
161 0x82004002, /* 64-bit 0x14 --> add %g1, %g2, %g1 */
162 0xc2586000, /* 64-bit 0x18 --> ldx [%g1 + %lo(_glapi_Dispatch)], %g1 */
163 #else
164 0x03000000, /* 32-bit 0x00 --> sethi %hi(_glapi_Dispatch), %g1 */
165 0x8730e00a, /* 32-bit 0x04 --> srl %g3, 10, %g3 */
166 0xc2006000, /* 32-bit 0x08 --> ld [%g1 + %lo(_glapi_Dispatch)], %g1 */
167 #endif
168 0x80a06000, /* --> cmp %g1, 0 */
169 0x02800005, /* --> be +4*5 */
170 0x01000000, /* --> nop */
171 #ifdef __arch64__
172 0xc2584003, /* 64-bit --> ldx [%g1 + %g3], %g1 */
173 #else
174 0xc2004003, /* 32-bit --> ld [%g1 + %g3], %g1 */
175 #endif
176 0x81c04000, /* --> jmp %g1 */
177 0x01000000, /* --> nop */
178 #ifdef __arch64__
179 0x9de3bf80, /* 64-bit --> save %sp, -128, %sp */
180 #else
181 0x9de3bfc0, /* 32-bit --> save %sp, -64, %sp */
182 #endif
183 0xa0100003, /* --> mov %g3, %l0 */
184 0x40000000, /* --> call _glapi_get_dispatch */
185 0x01000000, /* --> nop */
186 0x82100008, /* --> mov %o0, %g1 */
187 0x86100010, /* --> mov %l0, %g3 */
188 0x10bffff7, /* --> ba -4*9 */
189 0x81e80000, /* --> restore */
190 #endif
191 };
192 #ifdef GLX_USE_TLS
193 extern unsigned int __glapi_sparc_tls_stub;
194 extern unsigned long __glapi_sparc_get_dispatch(void);
195 unsigned int *code = &__glapi_sparc_tls_stub;
196 unsigned long dispatch = __glapi_sparc_get_dispatch();
197 #else
198 extern unsigned int __glapi_sparc_pthread_stub;
199 unsigned int *code = &__glapi_sparc_pthread_stub;
200 unsigned long dispatch = (unsigned long) &_glapi_Dispatch;
201 unsigned long call_dest = (unsigned long ) &_glapi_get_dispatch;
202 int idx;
203 #endif
204
205 #ifdef GLX_USE_TLS
206 code[0] = template[0] | (dispatch >> 10);
207 code[1] = template[1];
208 __glapi_sparc_icache_flush(&code[0]);
209 code[2] = template[2] | (dispatch & 0x3ff);
210 code[3] = template[3];
211 __glapi_sparc_icache_flush(&code[2]);
212 code[4] = template[4];
213 code[5] = template[5];
214 __glapi_sparc_icache_flush(&code[4]);
215 code[6] = template[6];
216 __glapi_sparc_icache_flush(&code[6]);
217 #else
218 #if defined(__arch64__)
219 code[0] = template[0] | (dispatch >> (32 + 10));
220 code[1] = template[1] | ((dispatch & 0xffffffff) >> 10);
221 __glapi_sparc_icache_flush(&code[0]);
222 code[2] = template[2] | ((dispatch >> 32) & 0x3ff);
223 code[3] = template[3];
224 __glapi_sparc_icache_flush(&code[2]);
225 code[4] = template[4];
226 code[5] = template[5];
227 __glapi_sparc_icache_flush(&code[4]);
228 code[6] = template[6] | (dispatch & 0x3ff);
229 idx = 7;
230 #else
231 code[0] = template[0] | (dispatch >> 10);
232 code[1] = template[1];
233 __glapi_sparc_icache_flush(&code[0]);
234 code[2] = template[2] | (dispatch & 0x3ff);
235 idx = 3;
236 #endif
237 code[idx + 0] = template[idx + 0];
238 __glapi_sparc_icache_flush(&code[idx - 1]);
239 code[idx + 1] = template[idx + 1];
240 code[idx + 2] = template[idx + 2];
241 __glapi_sparc_icache_flush(&code[idx + 1]);
242 code[idx + 3] = template[idx + 3];
243 code[idx + 4] = template[idx + 4];
244 __glapi_sparc_icache_flush(&code[idx + 3]);
245 code[idx + 5] = template[idx + 5];
246 code[idx + 6] = template[idx + 6];
247 __glapi_sparc_icache_flush(&code[idx + 5]);
248 code[idx + 7] = template[idx + 7];
249 code[idx + 8] = template[idx + 8] |
250 (((call_dest - ((unsigned long) &code[idx + 8]))
251 >> 2) & 0x3fffffff);
252 __glapi_sparc_icache_flush(&code[idx + 7]);
253 code[idx + 9] = template[idx + 9];
254 code[idx + 10] = template[idx + 10];
255 __glapi_sparc_icache_flush(&code[idx + 9]);
256 code[idx + 11] = template[idx + 11];
257 code[idx + 12] = template[idx + 12];
258 __glapi_sparc_icache_flush(&code[idx + 11]);
259 code[idx + 13] = template[idx + 13];
260 __glapi_sparc_icache_flush(&code[idx + 13]);
261 #endif
262 #endif
263 }
264
265
266 _glapi_proc
generate_entrypoint(GLuint functionOffset)267 generate_entrypoint(GLuint functionOffset)
268 {
269 #if defined(HAVE_PTHREAD) || defined(GLX_USE_TLS)
270 static const unsigned int template[] = {
271 0x07000000, /* sethi %hi(0), %g3 */
272 0x8210000f, /* mov %o7, %g1 */
273 0x40000000, /* call */
274 0x9e100001, /* mov %g1, %o7 */
275 };
276 #ifdef GLX_USE_TLS
277 extern unsigned int __glapi_sparc_tls_stub;
278 unsigned long call_dest = (unsigned long ) &__glapi_sparc_tls_stub;
279 #else
280 extern unsigned int __glapi_sparc_pthread_stub;
281 unsigned long call_dest = (unsigned long ) &__glapi_sparc_pthread_stub;
282 #endif
283 unsigned int *code = (unsigned int *) u_execmem_alloc(sizeof(template));
284 if (code) {
285 code[0] = template[0] | (functionOffset & 0x3fffff);
286 code[1] = template[1];
287 __glapi_sparc_icache_flush(&code[0]);
288 code[2] = template[2] |
289 (((call_dest - ((unsigned long) &code[2]))
290 >> 2) & 0x3fffffff);
291 code[3] = template[3];
292 __glapi_sparc_icache_flush(&code[2]);
293 }
294 return (_glapi_proc) code;
295 #endif
296 }
297
298
299 void
fill_in_entrypoint_offset(_glapi_proc entrypoint,GLuint offset)300 fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset)
301 {
302 unsigned int *code = (unsigned int *) entrypoint;
303
304 code[0] &= ~0x3fffff;
305 code[0] |= (offset * sizeof(void *)) & 0x3fffff;
306 __glapi_sparc_icache_flush(&code[0]);
307 }
308
309
310 #else /* USE_*_ASM */
311
312 static void
init_glapi_relocs(void)313 init_glapi_relocs( void )
314 {
315 }
316
317
318 _glapi_proc
generate_entrypoint(GLuint functionOffset)319 generate_entrypoint(GLuint functionOffset)
320 {
321 (void) functionOffset;
322 return NULL;
323 }
324
325
326 void
fill_in_entrypoint_offset(_glapi_proc entrypoint,GLuint offset)327 fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset)
328 {
329 /* an unimplemented architecture */
330 (void) entrypoint;
331 (void) offset;
332 }
333
334 #endif /* USE_*_ASM */
335
336
337 void
init_glapi_relocs_once(void)338 init_glapi_relocs_once( void )
339 {
340 #if defined(HAVE_PTHREAD) || defined(GLX_USE_TLS)
341 static pthread_once_t once_control = PTHREAD_ONCE_INIT;
342 pthread_once( & once_control, init_glapi_relocs );
343 #endif
344 }
345