1 /* 2 * Mesa 3-D graphics library 3 * 4 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included 14 * in all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 22 * 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 <string.h> 33 34 #include "c11/threads.h" 35 #include "glapi/glapi_priv.h" 36 #include "u_execmem.h" 37 38 39 #ifdef USE_X86_ASM 40 41 #if defined( GLX_USE_TLS ) 42 extern GLubyte gl_dispatch_functions_start[]; 43 extern GLubyte gl_dispatch_functions_end[]; 44 #else 45 extern const GLubyte gl_dispatch_functions_start[]; 46 #endif 47 48 #endif /* USE_X86_ASM */ 49 50 51 #if defined(DISPATCH_FUNCTION_SIZE) 52 53 _glapi_proc 54 get_entrypoint_address(unsigned int functionOffset) 55 { 56 return (_glapi_proc) (gl_dispatch_functions_start 57 + (DISPATCH_FUNCTION_SIZE * functionOffset)); 58 } 59 60 #endif 61 62 63 #if defined(USE_X86_ASM) 64 65 /** 66 * Perform platform-specific GL API entry-point fixups. 67 */ 68 static void 69 init_glapi_relocs( void ) 70 { 71 #if defined(GLX_USE_TLS) && !defined(GLX_X86_READONLY_TEXT) 72 extern unsigned long _x86_get_dispatch(void); 73 char run_time_patch[] = { 74 0x65, 0xa1, 0, 0, 0, 0 /* movl %gs:0,%eax */ 75 }; 76 GLuint *offset = (GLuint *) &run_time_patch[2]; /* 32-bits for x86/32 */ 77 const GLubyte * const get_disp = (const GLubyte *) run_time_patch; 78 GLubyte * curr_func = (GLubyte *) gl_dispatch_functions_start; 79 80 *offset = _x86_get_dispatch(); 81 while ( curr_func != (GLubyte *) gl_dispatch_functions_end ) { 82 (void) memcpy( curr_func, get_disp, sizeof(run_time_patch)); 83 curr_func += DISPATCH_FUNCTION_SIZE; 84 } 85 #endif 86 } 87 88 89 /** 90 * Generate a dispatch function (entrypoint) which jumps through 91 * the given slot number (offset) in the current dispatch table. 92 * We need assembly language in order to accomplish this. 93 */ 94 _glapi_proc 95 generate_entrypoint(unsigned int functionOffset) 96 { 97 /* 32 is chosen as something of a magic offset. For x86, the dispatch 98 * at offset 32 is the first one where the offset in the 99 * "jmp OFFSET*4(%eax)" can't be encoded in a single byte. 100 */ 101 const GLubyte * const template_func = gl_dispatch_functions_start 102 + (DISPATCH_FUNCTION_SIZE * 32); 103 GLubyte * const code = (GLubyte *) u_execmem_alloc(DISPATCH_FUNCTION_SIZE); 104 105 106 if ( code != NULL ) { 107 (void) memcpy(code, template_func, DISPATCH_FUNCTION_SIZE); 108 fill_in_entrypoint_offset( (_glapi_proc) code, functionOffset ); 109 } 110 111 return (_glapi_proc) code; 112 } 113 114 115 /** 116 * This function inserts a new dispatch offset into the assembly language 117 * stub that was generated with the preceeding function. 118 */ 119 void 120 fill_in_entrypoint_offset(_glapi_proc entrypoint, unsigned int offset) 121 { 122 GLubyte * const code = (GLubyte *) entrypoint; 123 124 #if defined(GLX_USE_TLS) 125 *((unsigned int *)(code + 8)) = 4 * offset; 126 #else 127 *((unsigned int *)(code + 11)) = 4 * offset; 128 *((unsigned int *)(code + 22)) = 4 * offset; 129 #endif 130 } 131 132 133 #elif defined(USE_SPARC_ASM) 134 135 extern void __glapi_sparc_icache_flush(unsigned int *); 136 137 static void 138 init_glapi_relocs( void ) 139 { 140 #if defined(HAVE_PTHREAD) || defined(GLX_USE_TLS) 141 static const unsigned int template[] = { 142 #ifdef GLX_USE_TLS 143 0x05000000, /* sethi %hi(_glapi_tls_Dispatch), %g2 */ 144 0x8730e00a, /* srl %g3, 10, %g3 */ 145 0x8410a000, /* or %g2, %lo(_glapi_tls_Dispatch), %g2 */ 146 #ifdef __arch64__ 147 0xc259c002, /* ldx [%g7 + %g2], %g1 */ 148 0xc2584003, /* ldx [%g1 + %g3], %g1 */ 149 #else 150 0xc201c002, /* ld [%g7 + %g2], %g1 */ 151 0xc2004003, /* ld [%g1 + %g3], %g1 */ 152 #endif 153 0x81c04000, /* jmp %g1 */ 154 0x01000000, /* nop */ 155 #else 156 #ifdef __arch64__ 157 0x03000000, /* 64-bit 0x00 --> sethi %hh(_glapi_Dispatch), %g1 */ 158 0x05000000, /* 64-bit 0x04 --> sethi %lm(_glapi_Dispatch), %g2 */ 159 0x82106000, /* 64-bit 0x08 --> or %g1, %hm(_glapi_Dispatch), %g1 */ 160 0x8730e00a, /* 64-bit 0x0c --> srl %g3, 10, %g3 */ 161 0x83287020, /* 64-bit 0x10 --> sllx %g1, 32, %g1 */ 162 0x82004002, /* 64-bit 0x14 --> add %g1, %g2, %g1 */ 163 0xc2586000, /* 64-bit 0x18 --> ldx [%g1 + %lo(_glapi_Dispatch)], %g1 */ 164 #else 165 0x03000000, /* 32-bit 0x00 --> sethi %hi(_glapi_Dispatch), %g1 */ 166 0x8730e00a, /* 32-bit 0x04 --> srl %g3, 10, %g3 */ 167 0xc2006000, /* 32-bit 0x08 --> ld [%g1 + %lo(_glapi_Dispatch)], %g1 */ 168 #endif 169 0x80a06000, /* --> cmp %g1, 0 */ 170 0x02800005, /* --> be +4*5 */ 171 0x01000000, /* --> nop */ 172 #ifdef __arch64__ 173 0xc2584003, /* 64-bit --> ldx [%g1 + %g3], %g1 */ 174 #else 175 0xc2004003, /* 32-bit --> ld [%g1 + %g3], %g1 */ 176 #endif 177 0x81c04000, /* --> jmp %g1 */ 178 0x01000000, /* --> nop */ 179 #ifdef __arch64__ 180 0x9de3bf80, /* 64-bit --> save %sp, -128, %sp */ 181 #else 182 0x9de3bfc0, /* 32-bit --> save %sp, -64, %sp */ 183 #endif 184 0xa0100003, /* --> mov %g3, %l0 */ 185 0x40000000, /* --> call _glapi_get_dispatch */ 186 0x01000000, /* --> nop */ 187 0x82100008, /* --> mov %o0, %g1 */ 188 0x86100010, /* --> mov %l0, %g3 */ 189 0x10bffff7, /* --> ba -4*9 */ 190 0x81e80000, /* --> restore */ 191 #endif 192 }; 193 #ifdef GLX_USE_TLS 194 extern unsigned int __glapi_sparc_tls_stub; 195 extern unsigned long __glapi_sparc_get_dispatch(void); 196 unsigned int *code = &__glapi_sparc_tls_stub; 197 unsigned long dispatch = __glapi_sparc_get_dispatch(); 198 #else 199 extern unsigned int __glapi_sparc_pthread_stub; 200 unsigned int *code = &__glapi_sparc_pthread_stub; 201 unsigned long dispatch = (unsigned long) &_glapi_Dispatch; 202 unsigned long call_dest = (unsigned long ) &_glapi_get_dispatch; 203 int idx; 204 #endif 205 206 #ifdef GLX_USE_TLS 207 code[0] = template[0] | (dispatch >> 10); 208 code[1] = template[1]; 209 __glapi_sparc_icache_flush(&code[0]); 210 code[2] = template[2] | (dispatch & 0x3ff); 211 code[3] = template[3]; 212 __glapi_sparc_icache_flush(&code[2]); 213 code[4] = template[4]; 214 code[5] = template[5]; 215 __glapi_sparc_icache_flush(&code[4]); 216 code[6] = template[6]; 217 __glapi_sparc_icache_flush(&code[6]); 218 #else 219 #if defined(__arch64__) 220 code[0] = template[0] | (dispatch >> (32 + 10)); 221 code[1] = template[1] | ((dispatch & 0xffffffff) >> 10); 222 __glapi_sparc_icache_flush(&code[0]); 223 code[2] = template[2] | ((dispatch >> 32) & 0x3ff); 224 code[3] = template[3]; 225 __glapi_sparc_icache_flush(&code[2]); 226 code[4] = template[4]; 227 code[5] = template[5]; 228 __glapi_sparc_icache_flush(&code[4]); 229 code[6] = template[6] | (dispatch & 0x3ff); 230 idx = 7; 231 #else 232 code[0] = template[0] | (dispatch >> 10); 233 code[1] = template[1]; 234 __glapi_sparc_icache_flush(&code[0]); 235 code[2] = template[2] | (dispatch & 0x3ff); 236 idx = 3; 237 #endif 238 code[idx + 0] = template[idx + 0]; 239 __glapi_sparc_icache_flush(&code[idx - 1]); 240 code[idx + 1] = template[idx + 1]; 241 code[idx + 2] = template[idx + 2]; 242 __glapi_sparc_icache_flush(&code[idx + 1]); 243 code[idx + 3] = template[idx + 3]; 244 code[idx + 4] = template[idx + 4]; 245 __glapi_sparc_icache_flush(&code[idx + 3]); 246 code[idx + 5] = template[idx + 5]; 247 code[idx + 6] = template[idx + 6]; 248 __glapi_sparc_icache_flush(&code[idx + 5]); 249 code[idx + 7] = template[idx + 7]; 250 code[idx + 8] = template[idx + 8] | 251 (((call_dest - ((unsigned long) &code[idx + 8])) 252 >> 2) & 0x3fffffff); 253 __glapi_sparc_icache_flush(&code[idx + 7]); 254 code[idx + 9] = template[idx + 9]; 255 code[idx + 10] = template[idx + 10]; 256 __glapi_sparc_icache_flush(&code[idx + 9]); 257 code[idx + 11] = template[idx + 11]; 258 code[idx + 12] = template[idx + 12]; 259 __glapi_sparc_icache_flush(&code[idx + 11]); 260 code[idx + 13] = template[idx + 13]; 261 __glapi_sparc_icache_flush(&code[idx + 13]); 262 #endif 263 #endif 264 } 265 266 267 _glapi_proc 268 generate_entrypoint(GLuint functionOffset) 269 { 270 #if defined(HAVE_PTHREAD) || defined(GLX_USE_TLS) 271 static const unsigned int template[] = { 272 0x07000000, /* sethi %hi(0), %g3 */ 273 0x8210000f, /* mov %o7, %g1 */ 274 0x40000000, /* call */ 275 0x9e100001, /* mov %g1, %o7 */ 276 }; 277 #ifdef GLX_USE_TLS 278 extern unsigned int __glapi_sparc_tls_stub; 279 unsigned long call_dest = (unsigned long ) &__glapi_sparc_tls_stub; 280 #else 281 extern unsigned int __glapi_sparc_pthread_stub; 282 unsigned long call_dest = (unsigned long ) &__glapi_sparc_pthread_stub; 283 #endif 284 unsigned int *code = (unsigned int *) u_execmem_alloc(sizeof(template)); 285 if (code) { 286 code[0] = template[0] | (functionOffset & 0x3fffff); 287 code[1] = template[1]; 288 __glapi_sparc_icache_flush(&code[0]); 289 code[2] = template[2] | 290 (((call_dest - ((unsigned long) &code[2])) 291 >> 2) & 0x3fffffff); 292 code[3] = template[3]; 293 __glapi_sparc_icache_flush(&code[2]); 294 } 295 return (_glapi_proc) code; 296 #endif 297 } 298 299 300 void 301 fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset) 302 { 303 unsigned int *code = (unsigned int *) entrypoint; 304 305 code[0] &= ~0x3fffff; 306 code[0] |= (offset * sizeof(void *)) & 0x3fffff; 307 __glapi_sparc_icache_flush(&code[0]); 308 } 309 310 311 #else /* USE_*_ASM */ 312 313 static void 314 init_glapi_relocs( void ) 315 { 316 } 317 318 319 _glapi_proc 320 generate_entrypoint(GLuint functionOffset) 321 { 322 (void) functionOffset; 323 return NULL; 324 } 325 326 327 void 328 fill_in_entrypoint_offset(_glapi_proc entrypoint, GLuint offset) 329 { 330 /* an unimplemented architecture */ 331 (void) entrypoint; 332 (void) offset; 333 } 334 335 #endif /* USE_*_ASM */ 336 337 338 void 339 init_glapi_relocs_once( void ) 340 { 341 #if defined(HAVE_PTHREAD) || defined(GLX_USE_TLS) 342 static once_flag flag = ONCE_FLAG_INIT; 343 call_once(&flag, init_glapi_relocs); 344 #endif 345 } 346
