1/*
2 * Mesa 3-D graphics library
3 *
4 * Copyright (C) 2010 LunarG Inc.
5 *
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:
12 *
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
15 *
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.
23 *
24 * Authors:
25 *    Chia-I Wu <olv@lunarg.com>
26 */
27
28#ifdef HAVE_FUNC_ATTRIBUTE_VISIBILITY
29#define HIDDEN __attribute__((visibility("hidden")))
30#else
31#define HIDDEN
32#endif
33
34#define X86_ENTRY_SIZE 32
35
36__asm__(".text\n"
37        ".balign 32\n"
38        "x86_entry_start:");
39
40#define STUB_ASM_ENTRY(func)        \
41   ".globl " func "\n"              \
42   ".type " func ", @function\n"    \
43   ".balign 32\n"                   \
44   func ":"
45
46#define STUB_ASM_CODE(slot)         \
47   "movl " ENTRY_CURRENT_TABLE ", %eax\n\t" \
48   "testl %eax, %eax\n\t"           \
49   "je 1f\n\t"                      \
50   "jmp *(4 * " slot ")(%eax)\n"    \
51   "1:\n\t"                         \
52   "call " ENTRY_CURRENT_TABLE_GET "\n\t" \
53   "jmp *(4 * " slot ")(%eax)"
54
55#define MAPI_TMP_STUB_ASM_GCC
56#include "mapi_tmp.h"
57
58#ifndef MAPI_MODE_BRIDGE
59
60__asm__(".balign 32\n"
61        "x86_entry_end:");
62
63#include <string.h>
64#include "u_execmem.h"
65
66extern const char x86_entry_start[] HIDDEN;
67extern const char x86_entry_end[] HIDDEN;
68
69void
70entry_patch_public(void)
71{
72}
73
74mapi_func
75entry_get_public(int slot)
76{
77   return (mapi_func) (x86_entry_start + slot * X86_ENTRY_SIZE);
78}
79
80void
81entry_patch(mapi_func entry, int slot)
82{
83   char *code = (char *) entry;
84
85   *((unsigned long *) (code + 11)) = slot * sizeof(mapi_func);
86   *((unsigned long *) (code + 22)) = slot * sizeof(mapi_func);
87}
88
89mapi_func
90entry_generate(int slot)
91{
92   const char *code_templ = x86_entry_end - X86_ENTRY_SIZE;
93   void *code;
94   mapi_func entry;
95
96   code = u_execmem_alloc(X86_ENTRY_SIZE);
97   if (!code)
98      return NULL;
99
100   memcpy(code, code_templ, X86_ENTRY_SIZE);
101   entry = (mapi_func) code;
102   entry_patch(entry, slot);
103
104   return entry;
105}
106
107#endif /* MAPI_MODE_BRIDGE */
108