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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. #include "u_macros.h"
  29.  
  30. __asm__(".text\n"
  31.         ".balign 32\n"
  32.         "x86_64_entry_start:");
  33.  
  34. #define STUB_ASM_ENTRY(func)                             \
  35.    ".globl " func "\n"                                   \
  36.    ".type " func ", @function\n"                         \
  37.    ".balign 32\n"                                        \
  38.    func ":"
  39.  
  40. #define STUB_ASM_CODE(slot)                              \
  41.    "movq " ENTRY_CURRENT_TABLE "@GOTTPOFF(%rip), %rax\n\t"  \
  42.    "movq %fs:(%rax), %r11\n\t"                           \
  43.    "jmp *(8 * " slot ")(%r11)"
  44.  
  45. #define MAPI_TMP_STUB_ASM_GCC
  46. #include "mapi_tmp.h"
  47.  
  48. #ifndef MAPI_MODE_BRIDGE
  49.  
  50. __asm__("x86_64_current_tls:\n\t"
  51.         "movq " ENTRY_CURRENT_TABLE "@GOTTPOFF(%rip), %rax\n\t"
  52.         "ret");
  53.  
  54. extern unsigned long
  55. x86_64_current_tls();
  56.  
  57. #include <string.h>
  58. #include "u_execmem.h"
  59.  
  60. void
  61. entry_patch_public(void)
  62. {
  63. }
  64.  
  65. static char
  66. x86_64_entry_start[];
  67.  
  68. mapi_func
  69. entry_get_public(int slot)
  70. {
  71.    return (mapi_func) (x86_64_entry_start + slot * 32);
  72. }
  73.  
  74. void
  75. entry_patch(mapi_func entry, int slot)
  76. {
  77.    char *code = (char *) entry;
  78.    *((unsigned int *) (code + 12)) = slot * sizeof(mapi_func);
  79. }
  80.  
  81. mapi_func
  82. entry_generate(int slot)
  83. {
  84.    const char code_templ[16] = {
  85.       /* movq %fs:0, %r11 */
  86.       0x64, 0x4c, 0x8b, 0x1c, 0x25, 0x00, 0x00, 0x00, 0x00,
  87.       /* jmp *0x1234(%r11) */
  88.       0x41, 0xff, 0xa3, 0x34, 0x12, 0x00, 0x00,
  89.    };
  90.    unsigned long addr;
  91.    void *code;
  92.    mapi_func entry;
  93.  
  94.    addr = x86_64_current_tls();
  95.    if ((addr >> 32) != 0xffffffff)
  96.       return NULL;
  97.    addr &= 0xffffffff;
  98.  
  99.    code = u_execmem_alloc(sizeof(code_templ));
  100.    if (!code)
  101.       return NULL;
  102.  
  103.    memcpy(code, code_templ, sizeof(code_templ));
  104.  
  105.    *((unsigned int *) (code + 5)) = addr;
  106.    entry = (mapi_func) code;
  107.    entry_patch(entry, slot);
  108.  
  109.    return entry;
  110. }
  111.  
  112. #endif /* MAPI_MODE_BRIDGE */
  113.