1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/*
* Mesa 3-D graphics library
* Version: 7.9
*
* Copyright (C) 2010 LunarG Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Authors:
* Chia-I Wu <olv@lunarg.com>
*/
#include <string.h>
#include "u_macros.h"
#ifdef __linux__
__asm__(".section .note.ABI-tag, \"a\"\n\t"
".p2align 2\n\t"
".long 1f - 0f\n\t" /* name length */
".long 3f - 2f\n\t" /* data length */
".long 1\n\t" /* note length */
"0: .asciz \"GNU\"\n\t" /* vendor name */
"1: .p2align 2\n\t"
"2: .long 0\n\t" /* note data: the ABI tag */
".long 2,4,20\n\t" /* Minimum kernel version w/TLS */
"3: .p2align 2\n\t"); /* pad out section */
#endif /* __linux__ */
__asm__(".text");
__asm__("x86_current_tls:\n\t"
"call 1f\n"
"1:\n\t"
"popl %eax\n\t"
"addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %eax\n\t"
"movl " ENTRY_CURRENT_TABLE "@GOTNTPOFF(%eax), %eax\n\t"
"ret");
#ifndef GLX_X86_READONLY_TEXT
__asm__(".section wtext, \"awx\", @progbits");
#endif /* GLX_X86_READONLY_TEXT */
__asm__(".balign 16\n"
"x86_entry_start:");
#define STUB_ASM_ENTRY(func) \
".globl " func "\n" \
".type " func ", @function\n" \
".balign 16\n" \
func ":"
#define STUB_ASM_CODE(slot) \
"call x86_current_tls\n\t" \
"movl %gs:(%eax), %eax\n\t" \
"jmp *(4 * " slot ")(%eax)"
#define MAPI_TMP_STUB_ASM_GCC
#include "mapi_tmp.h"
#ifndef GLX_X86_READONLY_TEXT
__asm__(".balign 16\n"
"x86_entry_end:");
__asm__(".text");
#endif /* GLX_X86_READONLY_TEXT */
#ifndef MAPI_MODE_BRIDGE
#include "u_execmem.h"
extern unsigned long
x86_current_tls();
static char x86_entry_start[];
static char x86_entry_end[];
void
entry_patch_public(void)
{
#ifndef GLX_X86_READONLY_TEXT
char patch[8] = {
0x65, 0xa1, 0x00, 0x00, 0x00, 0x00, /* movl %gs:0x0, %eax */
0x90, 0x90 /* nop's */
};
char *entry;
*((unsigned long *) (patch + 2)) = x86_current_tls();
for (entry = x86_entry_start; entry < x86_entry_end; entry += 16)
memcpy(entry, patch, sizeof(patch));
#endif
}
mapi_func
entry_get_public(int slot)
{
return (mapi_func) (x86_entry_start + slot * 16);
}
void
entry_patch(mapi_func entry, int slot)
{
char *code = (char *) entry;
*((unsigned long *) (code + 8)) = slot * sizeof(mapi_func);
}
mapi_func
entry_generate(int slot)
{
const char code_templ[16] = {
0x65, 0xa1, 0x00, 0x00, 0x00, 0x00, /* movl %gs:0x0, %eax */
0xff, 0xa0, 0x34, 0x12, 0x00, 0x00, /* jmp *0x1234(%eax) */
0x90, 0x90, 0x90, 0x90 /* nop's */
};
void *code;
mapi_func entry;
code = u_execmem_alloc(sizeof(code_templ));
if (!code)
return NULL;
memcpy(code, code_templ, sizeof(code_templ));
*((unsigned long *) (code + 2)) = x86_current_tls();
entry = (mapi_func) code;
entry_patch(entry, slot);
return entry;
}
#endif /* MAPI_MODE_BRIDGE */
|
