36cad00c208db7b87fde0c984f66352b0d896d6a
[mesa.git] / src / mapi / entry_x86-64_tls.h
1 /*
2 * Mesa 3-D graphics library
3 * Version: 7.9
4 *
5 * Copyright (C) 2010 LunarG Inc.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
22 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
23 * DEALINGS IN THE SOFTWARE.
24 *
25 * Authors:
26 * Chia-I Wu <olv@lunarg.com>
27 */
28
29 #include "u_macros.h"
30
31 __asm__(".text\n"
32 ".balign 32\n"
33 "x86_64_entry_start:");
34
35 #define STUB_ASM_ENTRY(func) \
36 ".globl " func "\n" \
37 ".type " func ", @function\n" \
38 ".balign 32\n" \
39 func ":"
40
41 #define STUB_ASM_CODE(slot) \
42 "movq " ENTRY_CURRENT_TABLE "@GOTTPOFF(%rip), %rax\n\t" \
43 "movq %fs:(%rax), %r11\n\t" \
44 "jmp *(8 * " slot ")(%r11)"
45
46 #define MAPI_TMP_STUB_ASM_GCC
47 #include "mapi_tmp.h"
48
49 #ifndef MAPI_MODE_BRIDGE
50
51 __asm__("x86_64_current_tls:\n\t"
52 "movq " ENTRY_CURRENT_TABLE "@GOTTPOFF(%rip), %rax\n\t"
53 "ret");
54
55 extern unsigned long
56 x86_64_current_tls();
57
58 #include <string.h>
59 #include "u_execmem.h"
60
61 void
62 entry_patch_public(void)
63 {
64 }
65
66 static char
67 x86_64_entry_start[];
68
69 mapi_func
70 entry_get_public(int slot)
71 {
72 return (mapi_func) (x86_64_entry_start + slot * 32);
73 }
74
75 void
76 entry_patch(mapi_func entry, int slot)
77 {
78 char *code = (char *) entry;
79 *((unsigned int *) (code + 12)) = slot * sizeof(mapi_func);
80 }
81
82 mapi_func
83 entry_generate(int slot)
84 {
85 const char code_templ[16] = {
86 /* movq %fs:0, %r11 */
87 0x64, 0x4c, 0x8b, 0x1c, 0x25, 0x00, 0x00, 0x00, 0x00,
88 /* jmp *0x1234(%r11) */
89 0x41, 0xff, 0xa3, 0x34, 0x12, 0x00, 0x00,
90 };
91 unsigned long addr;
92 void *code;
93 mapi_func entry;
94
95 addr = x86_64_current_tls();
96 if ((addr >> 32) != 0xffffffff)
97 return NULL;
98 addr &= 0xffffffff;
99
100 code = u_execmem_alloc(sizeof(code_templ));
101 if (!code)
102 return NULL;
103
104 memcpy(code, code_templ, sizeof(code_templ));
105
106 *((unsigned int *) (code + 5)) = addr;
107 entry = (mapi_func) code;
108 entry_patch(entry, slot);
109
110 return entry;
111 }
112
113 #endif /* MAPI_MODE_BRIDGE */