1 /**************************************************************************
2 *
3 * Copyright 2008 VMware, Inc.
4 * Copyright 2009-2010 Chia-I Wu <olvaffe@gmail.com>
5 * Copyright 2010-2011 LunarG, Inc.
6 * All Rights Reserved.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the
10 * "Software"), to deal in the Software without restriction, including
11 * without limitation the rights to use, copy, modify, merge, publish,
12 * distribute, sub license, and/or sell copies of the Software, and to
13 * permit persons to whom the Software is furnished to do so, subject to
14 * the following conditions:
15 *
16 * The above copyright notice and this permission notice (including the
17 * next paragraph) shall be included in all copies or substantial portions
18 * of the Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
25 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
26 * DEALINGS IN THE SOFTWARE.
27 *
28 **************************************************************************/
29
30
31 #include <stdlib.h>
32 #include <stdio.h>
33 #include <string.h>
34 #include <assert.h>
35 #include "c11/threads.h"
36
37 #include "eglglobals.h"
38 #include "egldevice.h"
39 #include "egldisplay.h"
40
41 #include "util/macros.h"
42 #include "util/os_misc.h"
43
44 #ifdef HAVE_MINCORE
45 #include <unistd.h>
46 #include <sys/mman.h>
47 #endif
48
49
50 static mtx_t _eglGlobalMutex = _MTX_INITIALIZER_NP;
51
52 struct _egl_global _eglGlobal =
53 {
54 .Mutex = &_eglGlobalMutex,
55 .DisplayList = NULL,
56 .DeviceList = &_eglSoftwareDevice,
57 .NumAtExitCalls = 2,
58 .AtExitCalls = {
59 /* default AtExitCalls, called in reverse order */
60 _eglFiniDevice, /* always called last */
61 _eglFiniDisplay,
62 },
63
64 #if USE_LIBGLVND
65 .ClientOnlyExtensionString =
66 #else
67 .ClientExtensionString =
68 #endif
69 "EGL_EXT_client_extensions"
70 #if !DETECT_OS_WINDOWS
71 " EGL_EXT_device_base"
72 " EGL_EXT_device_enumeration"
73 " EGL_EXT_device_query"
74 #endif
75 " EGL_EXT_platform_base"
76 " EGL_KHR_client_get_all_proc_addresses"
77 " EGL_KHR_debug"
78
79 #if USE_LIBGLVND
80 ,
81 .PlatformExtensionString =
82 #else
83 " "
84 #endif
85
86 #if !DETECT_OS_WINDOWS
87 "EGL_EXT_platform_device"
88 #endif
89 #ifdef HAVE_WAYLAND_PLATFORM
90 " EGL_EXT_platform_wayland"
91 " EGL_KHR_platform_wayland"
92 #endif
93 #ifdef HAVE_X11_PLATFORM
94 " EGL_EXT_platform_x11"
95 " EGL_KHR_platform_x11"
96 #endif
97 #ifdef HAVE_XCB_PLATFORM
98 " EGL_EXT_platform_xcb"
99 #endif
100 #ifdef HAVE_DRM_PLATFORM
101 " EGL_MESA_platform_gbm"
102 " EGL_KHR_platform_gbm"
103 #endif
104 " EGL_MESA_platform_surfaceless"
105 "",
106
107 .debugCallback = NULL,
108 .debugTypesEnabled = _EGL_DEBUG_BIT_CRITICAL | _EGL_DEBUG_BIT_ERROR,
109 };
110
111
112 static void
_eglAtExit(void)113 _eglAtExit(void)
114 {
115 EGLint i;
116 for (i = _eglGlobal.NumAtExitCalls - 1; i >= 0; i--)
117 _eglGlobal.AtExitCalls[i]();
118 }
119
120
121 void
_eglAddAtExitCall(void (* func)(void))122 _eglAddAtExitCall(void (*func)(void))
123 {
124 if (func) {
125 static EGLBoolean registered = EGL_FALSE;
126
127 mtx_lock(_eglGlobal.Mutex);
128
129 if (!registered) {
130 atexit(_eglAtExit);
131 registered = EGL_TRUE;
132 }
133
134 assert(_eglGlobal.NumAtExitCalls < ARRAY_SIZE(_eglGlobal.AtExitCalls));
135 _eglGlobal.AtExitCalls[_eglGlobal.NumAtExitCalls++] = func;
136
137 mtx_unlock(_eglGlobal.Mutex);
138 }
139 }
140
141 EGLBoolean
_eglPointerIsDereferencable(void * p)142 _eglPointerIsDereferencable(void *p)
143 {
144 uintptr_t addr = (uintptr_t) p;
145 uint64_t page_size = 0;
146 os_get_page_size(&page_size);
147 #ifdef HAVE_MINCORE
148 unsigned char valid = 0;
149
150 if (p == NULL)
151 return EGL_FALSE;
152
153 /* align addr to page_size */
154 addr &= ~(page_size - 1);
155
156 /* mincore expects &valid to be unsigned char* on Linux but char* on BSD:
157 * we cast pointers to void, to fix type mismatch warnings in all systems
158 */
159 if (mincore((void *) addr, page_size, (void*)&valid) < 0) {
160 return EGL_FALSE;
161 }
162
163 /* mincore() returns 0 on success, and -1 on failure. The last parameter
164 * is a vector of bytes with one entry for each page queried. mincore
165 * returns page residency information in the first bit of each byte in the
166 * vector.
167 *
168 * Residency doesn't actually matter when determining whether a pointer is
169 * dereferenceable, so the output vector can be ignored. What matters is
170 * whether mincore succeeds. See:
171 *
172 * http://man7.org/linux/man-pages/man2/mincore.2.html
173 */
174 return EGL_TRUE;
175 #else
176 // Without mincore(), we just assume that the first page is unmapped.
177 return addr >= page_size;
178 #endif
179 }
180