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  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. __asm__(".text");
  34.  
  35. __asm__("x86_64_current_tls:\n\t"
  36.         "movq u_current_table_tls@GOTTPOFF(%rip), %rax\n\t"
  37.         "ret");
  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.    "movq u_current_table_tls@GOTTPOFF(%rip), %rax\n\t"   \
  47.    "movq %fs:(%rax), %r11\n\t"                           \
  48.    "jmp *(8 * " slot ")(%r11)"
  49.  
  50. #define MAPI_TMP_STUB_ASM_GCC
  51. #include "mapi_tmp.h"
  52.  
  53. extern unsigned long
  54. x86_64_current_tls();
  55.  
  56. void
  57. entry_patch_public(void)
  58. {
  59. }
  60.  
  61. void
  62. entry_patch(mapi_func entry, int slot)
  63. {
  64.    char *code = (char *) entry;
  65.    *((unsigned int *) (code + 12)) = slot * sizeof(mapi_func);
  66. }
  67.  
  68. mapi_func
  69. entry_generate(int slot)
  70. {
  71.    const char code_templ[16] = {
  72.       /* movq %fs:0, %r11 */
  73.       0x64, 0x4c, 0x8b, 0x1c, 0x25, 0x00, 0x00, 0x00, 0x00,
  74.       /* jmp *0x1234(%r11) */
  75.       0x41, 0xff, 0xa3, 0x34, 0x12, 0x00, 0x00,
  76.    };
  77.    unsigned long addr;
  78.    void *code;
  79.    mapi_func entry;
  80.  
  81.    addr = x86_64_current_tls();
  82.    if ((addr >> 32) != 0xffffffff)
  83.       return NULL;
  84.    addr &= 0xffffffff;
  85.  
  86.    code = u_execmem_alloc(sizeof(code_templ));
  87.    if (!code)
  88.       return NULL;
  89.  
  90.    memcpy(code, code_templ, sizeof(code_templ));
  91.  
  92.    *((unsigned int *) (code + 5)) = addr;
  93.    entry = (mapi_func) code;
  94.    entry_patch(entry, slot);
  95.  
  96.    return entry;
  97. }
  98.