src/mapi/glapi/glapi_entrypoint.c

   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
  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
  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
  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
 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
 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
 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
 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
 313 init_glapi_relocs( void )
 314 {
 315 }
 316
 317
 318 _glapi_proc
 319 generate_entrypoint(GLuint functionOffset)
 320 {
 321    (void) functionOffset;
 322    return NULL;
 323 }
 324
 325
 326 void
 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
 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 }