src/mapi/entry_x86-64_tls.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 #ifdef __CET__
  29 #define ENDBR "endbr64\n\t"
  30 #else
  31 #define ENDBR
  32 #endif
  33
  34 #ifdef HAVE_FUNC_ATTRIBUTE_VISIBILITY
  35 #define HIDDEN __attribute__((visibility("hidden")))
  36 #else
  37 #define HIDDEN
  38 #endif
  39
  40 __asm__(".text\n"
  41         ".balign 32\n"
  42         "x86_64_entry_start:");
  43
  44 #define STUB_ASM_ENTRY(func)                             \
  45    ".globl " func "\n"                                   \
  46    ".type " func ", @function\n"                         \
  47    ".balign 32\n"                                        \
  48    func ":"
  49
  50 #ifndef __ILP32__
  51
  52 #define STUB_ASM_CODE(slot)                              \
  53    ENDBR                                                 \
  54    "movq " ENTRY_CURRENT_TABLE "@GOTTPOFF(%rip), %rax\n\t"  \
  55    "movq %fs:(%rax), %r11\n\t"                           \
  56    "jmp *(8 * " slot ")(%r11)"
  57
  58 #else
  59
  60 #define STUB_ASM_CODE(slot)                              \
  61    ENDBR                                                 \
  62    "movq " ENTRY_CURRENT_TABLE "@GOTTPOFF(%rip), %rax\n\t"  \
  63    "movl %fs:(%rax), %r11d\n\t"                          \
  64    "movl 4*" slot "(%r11d), %r11d\n\t"                   \
  65    "jmp *%r11"
  66
  67 #endif
  68
  69 #define MAPI_TMP_STUB_ASM_GCC
  70 #include "mapi_tmp.h"
  71
  72 #ifndef MAPI_MODE_BRIDGE
  73
  74 #include <string.h>
  75 #include "u_execmem.h"
  76
  77 void
  78 entry_patch_public(void)
  79 {
  80 }
  81
  82 extern char
  83 x86_64_entry_start[] HIDDEN;
  84
  85 mapi_func
  86 entry_get_public(int slot)
  87 {
  88    return (mapi_func) (x86_64_entry_start + slot * 32);
  89 }
  90
  91 void
  92 entry_patch(mapi_func entry, int slot)
  93 {
  94    char *code = (char *) entry;
  95    int offset = 12;
  96 #ifdef __ILP32__
  97    offset = 13;
  98 #endif
  99    *((unsigned int *) (code + offset)) = slot * sizeof(mapi_func);
 100 }
 101
 102 mapi_func
 103 entry_generate(int slot)
 104 {
 105    const char code_templ[] = {
 106 #ifndef __ILP32__
 107       /* movq %fs:0, %r11 */
 108       0x64, 0x4c, 0x8b, 0x1c, 0x25, 0x00, 0x00, 0x00, 0x00,
 109       /* jmp *0x1234(%r11) */
 110       0x41, 0xff, 0xa3, 0x34, 0x12, 0x00, 0x00,
 111 #else
 112       /* movl %fs:0, %r11d */
 113       0x64, 0x44, 0x8b, 0x1c, 0x25, 0x00, 0x00, 0x00, 0x00,
 114       /* movl 0x1234(%r11d), %r11d */
 115       0x67, 0x45, 0x8b, 0x9b, 0x34, 0x12, 0x00, 0x00,
 116       /* jmp *%r11 */
 117       0x41, 0xff, 0xe3,
 118 #endif
 119    };
 120    unsigned long long addr;
 121    char *code;
 122    mapi_func entry;
 123
 124    __asm__("movq " ENTRY_CURRENT_TABLE "@GOTTPOFF(%%rip), %0"
 125            : "=r" (addr));
 126    if ((addr >> 32) != 0xffffffff)
 127       return NULL;
 128    addr &= 0xffffffff;
 129
 130    code = u_execmem_alloc(sizeof(code_templ));
 131    if (!code)
 132       return NULL;
 133
 134    memcpy(code, code_templ, sizeof(code_templ));
 135
 136    *((unsigned int *) (code + 5)) = addr;
 137    entry = (mapi_func) code;
 138    entry_patch(entry, slot);
 139
 140    return entry;
 141 }
 142
 143 #endif /* MAPI_MODE_BRIDGE */