1/*
2 * Mesa 3-D graphics library
3 * Version:  7.9
4 *
5 * Copyright (C) 2010 LunarG Inc.
6 *
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:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
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.
24 *
25 * Authors:
26 *    Chia-I Wu <olv@lunarg.com>
27 */
28
29#include "u_macros.h"
30
31#define X86_ENTRY_SIZE 32
32
33__asm__(".text\n"
34        ".balign 32\n"
35        "x86_entry_start:");
36
37#define STUB_ASM_ENTRY(func)        \
38   ".globl " func "\n"              \
39   ".type " func ", @function\n"    \
40   ".balign 32\n"                   \
41   func ":"
42
43#define STUB_ASM_CODE(slot)         \
44   "movl " ENTRY_CURRENT_TABLE ", %eax\n\t" \
45   "testl %eax, %eax\n\t"           \
46   "je 1f\n\t"                      \
47   "jmp *(4 * " slot ")(%eax)\n"    \
48   "1:\n\t"                         \
49   "call " ENTRY_CURRENT_TABLE_GET "\n\t" \
50   "jmp *(4 * " slot ")(%eax)"
51
52#define MAPI_TMP_STUB_ASM_GCC
53#include "mapi_tmp.h"
54
55#ifndef MAPI_MODE_BRIDGE
56
57__asm__(".balign 32\n"
58        "x86_entry_end:");
59
60#include <string.h>
61#include "u_execmem.h"
62
63static const char x86_entry_start[];
64static const char x86_entry_end[];
65
66void
67entry_patch_public(void)
68{
69}
70
71mapi_func
72entry_get_public(int slot)
73{
74   return (mapi_func) (x86_entry_start + slot * X86_ENTRY_SIZE);
75}
76
77void
78entry_patch(mapi_func entry, int slot)
79{
80   char *code = (char *) entry;
81
82   *((unsigned long *) (code + 11)) = slot * sizeof(mapi_func);
83   *((unsigned long *) (code + 22)) = slot * sizeof(mapi_func);
84}
85
86mapi_func
87entry_generate(int slot)
88{
89   const char *code_templ = x86_entry_end - X86_ENTRY_SIZE;
90   void *code;
91   mapi_func entry;
92
93   code = u_execmem_alloc(X86_ENTRY_SIZE);
94   if (!code)
95      return NULL;
96
97   memcpy(code, code_templ, X86_ENTRY_SIZE);
98   entry = (mapi_func) code;
99   entry_patch(entry, slot);
100
101   return entry;
102}
103
104#endif /* MAPI_MODE_BRIDGE */
105