2 * Mesa 3-D graphics library
4 * Copyright (C) 2010 LunarG Inc.
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:
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
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.
25 * Chia-I Wu <olv@lunarg.com>
33 __asm__("x86_current_tls:\n\t"
37 "addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %eax\n\t"
38 "movl " ENTRY_CURRENT_TABLE
"@GOTNTPOFF(%eax), %eax\n\t"
41 #ifndef GLX_X86_READONLY_TEXT
42 __asm__(".section wtext, \"awx\", @progbits");
43 #endif /* GLX_X86_READONLY_TEXT */
45 __asm__(".balign 16\n"
48 #define STUB_ASM_ENTRY(func) \
50 ".type " func ", @function\n" \
54 #define STUB_ASM_CODE(slot) \
55 "call x86_current_tls\n\t" \
56 "movl %gs:(%eax), %eax\n\t" \
57 "jmp *(4 * " slot ")(%eax)"
59 #define MAPI_TMP_STUB_ASM_GCC
62 #ifndef GLX_X86_READONLY_TEXT
63 __asm__(".balign 16\n"
66 #endif /* GLX_X86_READONLY_TEXT */
68 #ifndef MAPI_MODE_BRIDGE
70 #include "u_execmem.h"
75 static char x86_entry_start
[];
76 static char x86_entry_end
[];
79 entry_patch_public(void)
81 #ifndef GLX_X86_READONLY_TEXT
83 0x65, 0xa1, 0x00, 0x00, 0x00, 0x00, /* movl %gs:0x0, %eax */
84 0x90, 0x90 /* nop's */
88 *((unsigned long *) (patch
+ 2)) = x86_current_tls();
90 for (entry
= x86_entry_start
; entry
< x86_entry_end
; entry
+= 16)
91 memcpy(entry
, patch
, sizeof(patch
));
96 entry_get_public(int slot
)
98 return (mapi_func
) (x86_entry_start
+ slot
* 16);
102 entry_patch(mapi_func entry
, int slot
)
104 char *code
= (char *) entry
;
105 *((unsigned long *) (code
+ 8)) = slot
* sizeof(mapi_func
);
109 entry_generate(int slot
)
111 const char code_templ
[16] = {
112 0x65, 0xa1, 0x00, 0x00, 0x00, 0x00, /* movl %gs:0x0, %eax */
113 0xff, 0xa0, 0x34, 0x12, 0x00, 0x00, /* jmp *0x1234(%eax) */
114 0x90, 0x90, 0x90, 0x90 /* nop's */
119 code
= u_execmem_alloc(sizeof(code_templ
));
123 memcpy(code
, code_templ
, sizeof(code_templ
));
125 *((unsigned long *) (code
+ 2)) = x86_current_tls();
126 entry
= (mapi_func
) code
;
127 entry_patch(entry
, slot
);
132 #endif /* MAPI_MODE_BRIDGE */