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  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(PTHREADS) || 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(PTHREADS) || 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(PTHREADS) || 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.