entry_x86_tsd.h revision af69d88d 
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#include "u_macros.h"
29
30#define X86_ENTRY_SIZE 32
31
32__asm__(".text\n"
33        ".balign 32\n"
34        "x86_entry_start:");
35
36#define STUB_ASM_ENTRY(func)        \
37   ".globl " func "\n"              \
38   ".type " func ", @function\n"    \
39   ".balign 32\n"                   \
40   func ":"
41
42#define STUB_ASM_CODE(slot)         \
43   "movl " ENTRY_CURRENT_TABLE ", %eax\n\t" \
44   "testl %eax, %eax\n\t"           \
45   "je 1f\n\t"                      \
46   "jmp *(4 * " slot ")(%eax)\n"    \
47   "1:\n\t"                         \
48   "call " ENTRY_CURRENT_TABLE_GET "\n\t" \
49   "jmp *(4 * " slot ")(%eax)"
50
51#define MAPI_TMP_STUB_ASM_GCC
52#include "mapi_tmp.h"
53
54#ifndef MAPI_MODE_BRIDGE
55
56__asm__(".balign 32\n"
57        "x86_entry_end:");
58
59#include <string.h>
60#include "u_execmem.h"
61
62static const char x86_entry_start[];
63static const char x86_entry_end[];
64
65void
66entry_patch_public(void)
67{
68}
69
70mapi_func
71entry_get_public(int slot)
72{
73   return (mapi_func) (x86_entry_start + slot * X86_ENTRY_SIZE);
74}
75
76void
77entry_patch(mapi_func entry, int slot)
78{
79   char *code = (char *) entry;
80
81   *((unsigned long *) (code + 11)) = slot * sizeof(mapi_func);
82   *((unsigned long *) (code + 22)) = slot * sizeof(mapi_func);
83}
84
85mapi_func
86entry_generate(int slot)
87{
88   const char *code_templ = x86_entry_end - X86_ENTRY_SIZE;
89   void *code;
90   mapi_func entry;
91
92   code = u_execmem_alloc(X86_ENTRY_SIZE);
93   if (!code)
94      return NULL;
95
96   memcpy(code, code_templ, X86_ENTRY_SIZE);
97   entry = (mapi_func) code;
98   entry_patch(entry, slot);
99
100   return entry;
101}
102
103#endif /* MAPI_MODE_BRIDGE */
104