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  1. /*
  2.  * Mesa 3-D graphics library
  3.  * Version:  7.9
  4.  *
  5.  * Copyright (C) 2010 LunarG Inc.
  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 OR
  18.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  22.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  23.  * DEALINGS IN THE SOFTWARE.
  24.  *
  25.  * Authors:
  26.  *    Chia-I Wu <olv@lunarg.com>
  27.  */
  28.  
  29. #include <string.h>
  30. #include "u_execmem.h"
  31. #include "u_macros.h"
  32.  
  33. #define X86_ENTRY_SIZE 32
  34.  
  35. __asm__(".text");
  36.  
  37. #define STUB_ASM_ENTRY(func)        \
  38.    ".globl " func "\n"              \
  39.    ".type " func ", @function\n"    \
  40.    ".balign 32\n"                   \
  41.    func ":"
  42.  
  43. #define STUB_ASM_CODE(slot)         \
  44.    "movl u_current_table, %eax\n\t" \
  45.    "testl %eax, %eax\n\t"           \
  46.    "je 1f\n\t"                      \
  47.    "jmp *(4 * " slot ")(%eax)\n"    \
  48.    "1:\n\t"                         \
  49.    "call u_current_get_internal\n\t"\
  50.    "jmp *(4 * " slot ")(%eax)"
  51.  
  52. #define MAPI_TMP_STUB_ASM_GCC
  53. #include "mapi_tmp.h"
  54.  
  55. __asm__(".balign 32\n"
  56.         "x86_entry_end:");
  57.  
  58. void
  59. entry_patch_public(void)
  60. {
  61. }
  62.  
  63. void
  64. entry_patch(mapi_func entry, int slot)
  65. {
  66.    char *code = (char *) entry;
  67.  
  68.    *((unsigned long *) (code + 11)) = slot * sizeof(mapi_func);
  69.    *((unsigned long *) (code + 22)) = slot * sizeof(mapi_func);
  70. }
  71.  
  72. mapi_func
  73. entry_generate(int slot)
  74. {
  75.    extern const char x86_entry_end[];
  76.    const char *code_templ = x86_entry_end - X86_ENTRY_SIZE;
  77.    void *code;
  78.    mapi_func entry;
  79.  
  80.    code = u_execmem_alloc(X86_ENTRY_SIZE);
  81.    if (!code)
  82.       return NULL;
  83.  
  84.    memcpy(code, code_templ, X86_ENTRY_SIZE);
  85.    entry = (mapi_func) code;
  86.    entry_patch(entry, slot);
  87.  
  88.    return entry;
  89. }
  90.