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