src/mapi/mapi/entry_x86_tsd.h

   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 "u_macros.h"
  30
  31 #define X86_ENTRY_SIZE 32
  32
  33 __asm__(".text\n"
  34         ".balign 32\n"
  35         "x86_entry_start:");
  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 " ENTRY_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 " ENTRY_CURRENT_TABLE_GET "\n\t" \
  50    "jmp *(4 * " slot ")(%eax)"
  51
  52 #define MAPI_TMP_STUB_ASM_GCC
  53 #include "mapi_tmp.h"
  54
  55 #ifndef MAPI_MODE_BRIDGE
  56
  57 __asm__(".balign 32\n"
  58         "x86_entry_end:");
  59
  60 #include <string.h>
  61 #include "u_execmem.h"
  62
  63 static const char x86_entry_start[];
  64 static const char x86_entry_end[];
  65
  66 void
  67 entry_patch_public(void)
  68 {
  69 }
  70
  71 mapi_func
  72 entry_get_public(int slot)
  73 {
  74    return (mapi_func) (x86_entry_start + slot * X86_ENTRY_SIZE);
  75 }
  76
  77 void
  78 entry_patch(mapi_func entry, int slot)
  79 {
  80    char *code = (char *) entry;
  81
  82    *((unsigned long *) (code + 11)) = slot * sizeof(mapi_func);
  83    *((unsigned long *) (code + 22)) = slot * sizeof(mapi_func);
  84 }
  85
  86 mapi_func
  87 entry_generate(int slot)
  88 {
  89    const char *code_templ = x86_entry_end - X86_ENTRY_SIZE;
  90    void *code;
  91    mapi_func entry;
  92
  93    code = u_execmem_alloc(X86_ENTRY_SIZE);
  94    if (!code)
  95       return NULL;
  96
  97    memcpy(code, code_templ, X86_ENTRY_SIZE);
  98    entry = (mapi_func) code;
  99    entry_patch(entry, slot);
 100
 101    return entry;
 102 }
 103
 104 #endif /* MAPI_MODE_BRIDGE */