38742e77dc439c8369f94a12b463b6d6fd3e44ae
2 * Mesa 3-D graphics library
5 * Copyright (C) 2010 LunarG Inc.
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:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
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.
26 * Chia-I Wu <olv@lunarg.com>
30 #include "u_execmem.h"
33 #define X86_ENTRY_SIZE 32
39 #define STUB_ASM_ENTRY(func) \
41 ".type " func ", @function\n" \
45 #define STUB_ASM_CODE(slot) \
46 "movl " ENTRY_CURRENT_TABLE ", %eax\n\t" \
47 "testl %eax, %eax\n\t" \
49 "jmp *(4 * " slot ")(%eax)\n" \
51 "call u_current_get_internal\n\t"\
52 "jmp *(4 * " slot ")(%eax)"
54 #define MAPI_TMP_STUB_ASM_GCC
57 __asm__(".balign 32\n"
61 entry_patch_public(void)
66 entry_get_public(int slot
)
68 extern const char x86_entry_start
[];
69 return (mapi_func
) (x86_entry_start
+ slot
* X86_ENTRY_SIZE
);
73 entry_patch(mapi_func entry
, int slot
)
75 char *code
= (char *) entry
;
77 *((unsigned long *) (code
+ 11)) = slot
* sizeof(mapi_func
);
78 *((unsigned long *) (code
+ 22)) = slot
* sizeof(mapi_func
);
82 entry_generate(int slot
)
84 extern const char x86_entry_end
[];
85 const char *code_templ
= x86_entry_end
- X86_ENTRY_SIZE
;
89 code
= u_execmem_alloc(X86_ENTRY_SIZE
);
93 memcpy(code
, code_templ
, X86_ENTRY_SIZE
);
94 entry
= (mapi_func
) code
;
95 entry_patch(entry
, slot
);