entry_x86-64_tls.h revision 848b8605 
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
54extern unsigned long
55x86_64_current_tls();
56
57#include <string.h>
58#include "u_execmem.h"
59
60void
61entry_patch_public(void)
62{
63}
64
65extern char x86_64_entry_start[] __attribute__((__visibility__("hidden")));
66
67mapi_func
68entry_get_public(int slot)
69{
70   return (mapi_func) (x86_64_entry_start + slot * 32);
71}
72
73void
74entry_patch(mapi_func entry, int slot)
75{
76   char *code = (char *) entry;
77   *((unsigned int *) (code + 12)) = slot * sizeof(mapi_func);
78}
79
80mapi_func
81entry_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   void *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