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  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. __asm__(".text\n"
  30.         ".balign 32\n"
  31.         "x86_64_entry_start:");
  32.  
  33. #define STUB_ASM_ENTRY(func)                             \
  34.    ".globl " func "\n"                                   \
  35.    ".type " func ", @function\n"                         \
  36.    ".balign 32\n"                                        \
  37.    func ":"
  38.  
  39. #define STUB_ASM_CODE(slot)                              \
  40.    "movq " ENTRY_CURRENT_TABLE "@GOTTPOFF(%rip), %rax\n\t"  \
  41.    "movq %fs:(%rax), %r11\n\t"                           \
  42.    "jmp *(8 * " slot ")(%r11)"
  43.  
  44. #define MAPI_TMP_STUB_ASM_GCC
  45. #include "mapi_tmp.h"
  46.  
  47. #ifndef MAPI_MODE_BRIDGE
  48.  
  49. __asm__("x86_64_current_tls:\n\t"
  50.         "movq " ENTRY_CURRENT_TABLE "@GOTTPOFF(%rip), %rax\n\t"
  51.         "ret");
  52.  
  53. extern unsigned long
  54. x86_64_current_tls();
  55.  
  56. #include <string.h>
  57. #include "u_execmem.h"
  58.  
  59. void
  60. entry_patch_public(void)
  61. {
  62. }
  63.  
  64. static char
  65. x86_64_entry_start[];
  66.  
  67. mapi_func
  68. entry_get_public(int slot)
  69. {
  70.    return (mapi_func) (x86_64_entry_start + slot * 32);
  71. }
  72.  
  73. void
  74. entry_patch(mapi_func entry, int slot)
  75. {
  76.    char *code = (char *) entry;
  77.    *((unsigned int *) (code + 12)) = slot * sizeof(mapi_func);
  78. }
  79.  
  80. mapi_func
  81. entry_generate(int slot)
  82. {
  83.    const char code_templ[16] = {
  84.       /* movq %fs:0, %r11 */
  85.       0x64, 0x4c, 0x8b, 0x1c, 0x25, 0x00, 0x00, 0x00, 0x00,
  86.       /* jmp *0x1234(%r11) */
  87.       0x41, 0xff, 0xa3, 0x34, 0x12, 0x00, 0x00,
  88.    };
  89.    unsigned long addr;
  90.    char *code;
  91.    mapi_func entry;
  92.  
  93.    addr = x86_64_current_tls();
  94.    if ((addr >> 32) != 0xffffffff)
  95.       return NULL;
  96.    addr &= 0xffffffff;
  97.  
  98.    code = u_execmem_alloc(sizeof(code_templ));
  99.    if (!code)
  100.       return NULL;
  101.  
  102.    memcpy(code, code_templ, sizeof(code_templ));
  103.  
  104.    *((unsigned int *) (code + 5)) = addr;
  105.    entry = (mapi_func) code;
  106.    entry_patch(entry, slot);
  107.  
  108.    return entry;
  109. }
  110.  
  111. #endif /* MAPI_MODE_BRIDGE */
  112.