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  1. /*
  2.  * Mesa 3-D graphics library
  3.  *
  4.  * Copyright (C) 2010 LunarG Inc.
  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 OR
  17.  * 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 OTHER
  20.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22.  * DEALINGS IN THE SOFTWARE.
  23.  *
  24.  * Authors:
  25.  *    Chia-I Wu <olv@lunarg.com>
  26.  */
  27.  
  28.  
  29. #define X86_ENTRY_SIZE 32
  30.  
  31. __asm__(".text\n"
  32.         ".balign 32\n"
  33.         "x86_entry_start:");
  34.  
  35. #define STUB_ASM_ENTRY(func)        \
  36.    ".globl " func "\n"              \
  37.    ".type " func ", @function\n"    \
  38.    ".balign 32\n"                   \
  39.    func ":"
  40.  
  41. #define STUB_ASM_CODE(slot)         \
  42.    "movl " ENTRY_CURRENT_TABLE ", %eax\n\t" \
  43.    "testl %eax, %eax\n\t"           \
  44.    "je 1f\n\t"                      \
  45.    "jmp *(4 * " slot ")(%eax)\n"    \
  46.    "1:\n\t"                         \
  47.    "call " ENTRY_CURRENT_TABLE_GET "\n\t" \
  48.    "jmp *(4 * " slot ")(%eax)"
  49.  
  50. #define MAPI_TMP_STUB_ASM_GCC
  51. #include "mapi_tmp.h"
  52.  
  53. #ifndef MAPI_MODE_BRIDGE
  54.  
  55. __asm__(".balign 32\n"
  56.         "x86_entry_end:");
  57.  
  58. #include <string.h>
  59. #include "u_execmem.h"
  60.  
  61. static const char x86_entry_start[];
  62. static const char x86_entry_end[];
  63.  
  64. void
  65. entry_patch_public(void)
  66. {
  67. }
  68.  
  69. mapi_func
  70. entry_get_public(int slot)
  71. {
  72.    return (mapi_func) (x86_entry_start + slot * X86_ENTRY_SIZE);
  73. }
  74.  
  75. void
  76. entry_patch(mapi_func entry, int slot)
  77. {
  78.    char *code = (char *) entry;
  79.  
  80.    *((unsigned long *) (code + 11)) = slot * sizeof(mapi_func);
  81.    *((unsigned long *) (code + 22)) = slot * sizeof(mapi_func);
  82. }
  83.  
  84. mapi_func
  85. entry_generate(int slot)
  86. {
  87.    const char *code_templ = x86_entry_end - X86_ENTRY_SIZE;
  88.    void *code;
  89.    mapi_func entry;
  90.  
  91.    code = u_execmem_alloc(X86_ENTRY_SIZE);
  92.    if (!code)
  93.       return NULL;
  94.  
  95.    memcpy(code, code_templ, X86_ENTRY_SIZE);
  96.    entry = (mapi_func) code;
  97.    entry_patch(entry, slot);
  98.  
  99.    return entry;
  100. }
  101.  
  102. #endif /* MAPI_MODE_BRIDGE */
  103.