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
  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 */