IABSD.fr/xenocara/lib/mesa/src/mapi/glapi/glapi_entrypoint.c

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• Author : jsg
  Date : 2025-06-05 14:17:56
  Hash : 452696b8
  Message : Merge Mesa 25.0.7

• lib/mesa/src/mapi/glapi/glapi_entrypoint.c

• /*
   * Mesa 3-D graphics library
   *
   * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the "Software"),
   * to deal in the Software without restriction, including without limitation
   * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   * and/or sell copies of the Software, and to permit persons to whom the
   * Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included
   * in all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
   * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
   * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
   * OTHER DEALINGS IN THE SOFTWARE.
   */
  
  /**
   * \file glapi_entrypoint.c
   *
   * Arch-specific code for manipulating GL API entrypoints (dispatch stubs).
   */
  
  
  #include <string.h>
  
  #include "c11/threads.h"
  #include "glapi/glapi_priv.h"
  
  
  #ifdef USE_X86_ASM
  
  extern       GLubyte gl_dispatch_functions_start[];
  extern       GLubyte gl_dispatch_functions_end[];
  
  #endif /* USE_X86_ASM */
  
  
  #if defined(DISPATCH_FUNCTION_SIZE)
  
  _glapi_proc
  get_entrypoint_address(unsigned int functionOffset)
  {
     return (_glapi_proc) (gl_dispatch_functions_start
                           + (DISPATCH_FUNCTION_SIZE * functionOffset));
  }
  
  #endif
  
  
  #if defined(USE_X86_ASM)
  
  /**
   * Perform platform-specific GL API entry-point fixups.
   */
  static void
  init_glapi_relocs( void )
  {
  #if !defined(GLX_X86_READONLY_TEXT)
      extern unsigned long _x86_get_dispatch(void);
      char run_time_patch[] = {
         0x65, 0xa1, 0, 0, 0, 0 /* movl %gs:0,%eax */
      };
      GLuint *offset = (GLuint *) &run_time_patch[2]; /* 32-bits for x86/32 */
      const GLubyte * const get_disp = (const GLubyte *) run_time_patch;
      GLubyte * curr_func = (GLubyte *) gl_dispatch_functions_start;
  
      *offset = _x86_get_dispatch();
      while ( curr_func != (GLubyte *) gl_dispatch_functions_end ) {
  	(void) memcpy( curr_func, get_disp, sizeof(run_time_patch));
  	curr_func += DISPATCH_FUNCTION_SIZE;
      }
  #endif
  }
  
  #elif defined(USE_SPARC_ASM)
  
  extern void __glapi_sparc_icache_flush(unsigned int *);
  
  static void
  init_glapi_relocs( void )
  {
      static const unsigned int template[] = {
  	0x05000000, /* sethi %hi(_mesa_glapi_tls_Dispatch), %g2 */
  	0x8730e00a, /* srl %g3, 10, %g3 */
  	0x8410a000, /* or %g2, %lo(_mesa_glapi_tls_Dispatch), %g2 */
  #ifdef __arch64__
  	0xc259c002, /* ldx [%g7 + %g2], %g1 */
  	0xc2584003, /* ldx [%g1 + %g3], %g1 */
  #else
  	0xc201c002, /* ld [%g7 + %g2], %g1 */
  	0xc2004003, /* ld [%g1 + %g3], %g1 */
  #endif
  	0x81c04000, /* jmp %g1 */
  	0x01000000, /* nop  */
      };
      extern unsigned int __glapi_sparc_tls_stub;
      extern unsigned long __glapi_sparc_get_dispatch(void);
      unsigned int *code = &__glapi_sparc_tls_stub;
      unsigned long dispatch = __glapi_sparc_get_dispatch();
  
      code[0] = template[0] | (dispatch >> 10);
      code[1] = template[1];
      __glapi_sparc_icache_flush(&code[0]);
      code[2] = template[2] | (dispatch & 0x3ff);
      code[3] = template[3];
      __glapi_sparc_icache_flush(&code[2]);
      code[4] = template[4];
      code[5] = template[5];
      __glapi_sparc_icache_flush(&code[4]);
      code[6] = template[6];
      __glapi_sparc_icache_flush(&code[6]);
  }
  
  
  #else /* USE_*_ASM */
  
  static void
  init_glapi_relocs( void )
  {
  }
  
  #endif /* USE_*_ASM */
  
  
  void
  init_glapi_relocs_once( void )
  {
     static once_flag flag = ONCE_FLAG_INIT;
     call_once(&flag, init_glapi_relocs);
  }