entry_x86_tsd.h revision 0f50a781 
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#ifdef __PIC__
43#define STUB_ASM_CODE(slot)         \
44   "movl " ENTRY_CURRENT_TABLE "@PLT, %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 "@PLT\n\t" \
50   "jmp *(4 * " slot ")(%eax)"
51#else
52#define STUB_ASM_CODE(slot)         \
53   "movl " ENTRY_CURRENT_TABLE ", %eax\n\t" \
54   "testl %eax, %eax\n\t"           \
55   "je 1f\n\t"                      \
56   "jmp *(4 * " slot ")(%eax)\n"    \
57   "1:\n\t"                         \
58   "call " ENTRY_CURRENT_TABLE_GET "\n\t" \
59   "jmp *(4 * " slot ")(%eax)"
60#endif
61
62#define MAPI_TMP_STUB_ASM_GCC
63#include "mapi_tmp.h"
64
65#ifndef MAPI_MODE_BRIDGE
66
67__asm__(".balign 32\n"
68        "x86_entry_end:");
69
70#include <string.h>
71#include "u_execmem.h"
72
73extern const char x86_entry_start[] __attribute__((__visibility__("hidden")));
74extern const char x86_entry_end[] __attribute__((__visibility__("hidden")));
75
76void
77entry_patch_public(void)
78{
79}
80
81mapi_func
82entry_get_public(int slot)
83{
84   return (mapi_func) (x86_entry_start + slot * X86_ENTRY_SIZE);
85}
86
87void
88entry_patch(mapi_func entry, int slot)
89{
90   char *code = (char *) entry;
91
92   *((unsigned long *) (code + 11)) = slot * sizeof(mapi_func);
93   *((unsigned long *) (code + 22)) = slot * sizeof(mapi_func);
94}
95
96mapi_func
97entry_generate(int slot)
98{
99   const char *code_templ = x86_entry_end - X86_ENTRY_SIZE;
100   void *code;
101   mapi_func entry;
102
103   code = u_execmem_alloc(X86_ENTRY_SIZE);
104   if (!code)
105      return NULL;
106
107   memcpy(code, code_templ, X86_ENTRY_SIZE);
108   entry = (mapi_func) code;
109   entry_patch(entry, slot);
110
111   return entry;
112}
113
114#endif /* MAPI_MODE_BRIDGE */
115