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