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