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>
28 #ifdef HAVE_FUNC_ATTRIBUTE_VISIBILITY
29 #define HIDDEN __attribute__((visibility("hidden")))
36 "x86_64_entry_start:");
38 #define STUB_ASM_ENTRY(func) \
40 ".type " func ", @function\n" \
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)"
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" \
61 #define MAPI_TMP_STUB_ASM_GCC
64 #ifndef MAPI_MODE_BRIDGE
67 #include "u_execmem.h"
70 entry_patch_public(void)
75 x86_64_entry_start
[] HIDDEN
;
78 entry_get_public(int slot
)
80 return (mapi_func
) (x86_64_entry_start
+ slot
* 32);
84 entry_patch(mapi_func entry
, int slot
)
86 char *code
= (char *) entry
;
91 *((unsigned int *) (code
+ offset
)) = slot
* sizeof(mapi_func
);
95 entry_generate(int slot
)
97 const char code_templ
[] = {
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,
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,
112 unsigned long long addr
;
116 __asm__("movq " ENTRY_CURRENT_TABLE
"@GOTTPOFF(%%rip), %0"
118 if ((addr
>> 32) != 0xffffffff)
122 code
= u_execmem_alloc(sizeof(code_templ
));
126 memcpy(code
, code_templ
, sizeof(code_templ
));
128 *((unsigned int *) (code
+ 5)) = addr
;
129 entry
= (mapi_func
) code
;
130 entry_patch(entry
, slot
);
135 #endif /* MAPI_MODE_BRIDGE */