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>
29 #define ENDBR "endbr32\n\t"
34 #ifdef HAVE_FUNC_ATTRIBUTE_VISIBILITY
35 #define HIDDEN __attribute__((visibility("hidden")))
40 #define X86_ENTRY_SIZE 64
46 #define STUB_ASM_ENTRY(func) \
48 ".type " func ", @function\n" \
52 #define STUB_ASM_CODE(slot) \
57 "addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %ecx\n\t" \
58 "movl " ENTRY_CURRENT_TABLE "@GOT(%ecx), %eax\n\t" \
59 "mov (%eax), %eax\n\t" \
60 "testl %eax, %eax\n\t" \
63 "movl %ecx, %ebx\n\t" \
64 "call " ENTRY_CURRENT_TABLE_GET "@PLT\n\t" \
67 "jmp *(4 * " slot ")(%eax)"
69 #define MAPI_TMP_STUB_ASM_GCC
72 #ifndef MAPI_MODE_BRIDGE
74 __asm__(".balign 32\n"
78 #include "u_execmem.h"
80 extern const char x86_entry_start
[] HIDDEN
;
81 extern const char x86_entry_end
[] HIDDEN
;
84 entry_patch_public(void)
89 entry_get_public(int slot
)
91 return (mapi_func
) (x86_entry_start
+ slot
* X86_ENTRY_SIZE
);
95 entry_patch(mapi_func entry
, int slot
)
97 char *code
= (char *) entry
;
99 *((unsigned long *) (code
+ 11)) = slot
* sizeof(mapi_func
);
100 *((unsigned long *) (code
+ 22)) = slot
* sizeof(mapi_func
);
104 entry_generate(int slot
)
106 const char *code_templ
= x86_entry_end
- X86_ENTRY_SIZE
;
110 code
= u_execmem_alloc(X86_ENTRY_SIZE
);
114 memcpy(code
, code_templ
, X86_ENTRY_SIZE
);
115 entry
= (mapi_func
) code
;
116 entry_patch(entry
, slot
);
121 #endif /* MAPI_MODE_BRIDGE */