src/mapi/entry_x86_tsd.h

   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 #ifdef HAVE_FUNC_ATTRIBUTE_VISIBILITY
  29 #define HIDDEN __attribute__((visibility("hidden")))
  30 #else
  31 #define HIDDEN
  32 #endif
  33
  34 #define X86_ENTRY_SIZE 32
  35
  36 __asm__(".text\n"
  37         ".balign 32\n"
  38         "x86_entry_start:");
  39
  40 #define STUB_ASM_ENTRY(func)        \
  41    ".globl " func "\n"              \
  42    ".type " func ", @function\n"    \
  43    ".balign 32\n"                   \
  44    func ":"
  45
  46 #define STUB_ASM_CODE(slot)         \
  47    "movl " ENTRY_CURRENT_TABLE ", %eax\n\t" \
  48    "testl %eax, %eax\n\t"           \
  49    "je 1f\n\t"                      \
  50    "jmp *(4 * " slot ")(%eax)\n"    \
  51    "1:\n\t"                         \
  52    "call " ENTRY_CURRENT_TABLE_GET "\n\t" \
  53    "jmp *(4 * " slot ")(%eax)"
  54
  55 #define MAPI_TMP_STUB_ASM_GCC
  56 #include "mapi_tmp.h"
  57
  58 #ifndef MAPI_MODE_BRIDGE
  59
  60 __asm__(".balign 32\n"
  61         "x86_entry_end:");
  62
  63 #include <string.h>
  64 #include "u_execmem.h"
  65
  66 extern const char x86_entry_start[] HIDDEN;
  67 extern const char x86_entry_end[] HIDDEN;
  68
  69 void
  70 entry_patch_public(void)
  71 {
  72 }
  73
  74 mapi_func
  75 entry_get_public(int slot)
  76 {
  77    return (mapi_func) (x86_entry_start + slot * X86_ENTRY_SIZE);
  78 }
  79
  80 void
  81 entry_patch(mapi_func entry, int slot)
  82 {
  83    char *code = (char *) entry;
  84
  85    *((unsigned long *) (code + 11)) = slot * sizeof(mapi_func);
  86    *((unsigned long *) (code + 22)) = slot * sizeof(mapi_func);
  87 }
  88
  89 mapi_func
  90 entry_generate(int slot)
  91 {
  92    const char *code_templ = x86_entry_end - X86_ENTRY_SIZE;
  93    void *code;
  94    mapi_func entry;
  95
  96    code = u_execmem_alloc(X86_ENTRY_SIZE);
  97    if (!code)
  98       return NULL;
  99
 100    memcpy(code, code_templ, X86_ENTRY_SIZE);
 101    entry = (mapi_func) code;
 102    entry_patch(entry, slot);
 103
 104    return entry;
 105 }
 106
 107 #endif /* MAPI_MODE_BRIDGE */