1/*
2 ** Copyright 2009, The Android Open Source Project
3 **
4 ** Licensed under the Apache License, Version 2.0 (the "License");
5 ** you may not use this file except in compliance with the License.
6 ** You may obtain a copy of the License at
7 **
8 **     http://www.apache.org/licenses/LICENSE-2.0
9 **
10 ** Unless required by applicable law or agreed to in writing, software
11 ** distributed under the License is distributed on an "AS IS" BASIS,
12 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 ** See the License for the specific language governing permissions and
14 ** limitations under the License.
15 */
16
17#include <ctype.h>
18#include <errno.h>
19#include <stdlib.h>
20
21#include <log/log.h>
22
23#include "egldefs.h"
24
25// ----------------------------------------------------------------------------
26namespace android {
27// ----------------------------------------------------------------------------
28
29#undef API_ENTRY
30#undef CALL_GL_EXTENSION_API
31#undef GL_EXTENSION
32#undef GL_EXTENSION_NAME
33#undef GL_EXTENSION_ARRAY
34#undef GL_EXTENSION_LIST
35#undef GET_TLS
36
37#if defined(__arm__)
38
39    #define GET_TLS(reg) "mrc p15, 0, " #reg ", c13, c0, 3 \n"
40
41    #define API_ENTRY(_api) __attribute__((naked)) _api
42
43    #define CALL_GL_EXTENSION_API(_api)                         \
44         asm volatile(                                          \
45            GET_TLS(r12)                                        \
46            "ldr   r12, [r12, %[tls]] \n"                       \
47            "cmp   r12, #0            \n"                       \
48            "addne r12, %[api]        \n"                       \
49            "ldrne r12, [r12, %[ext]] \n"                       \
50            "cmpne r12, #0            \n"                       \
51            "bxne  r12                \n"                       \
52            "bx    lr                 \n"                       \
53            :                                                   \
54            : [tls] "J"(TLS_SLOT_OPENGL_API*4),                 \
55              [ext] "J"(__builtin_offsetof(gl_hooks_t,          \
56                                      ext.extensions[0])),      \
57              [api] "I"(_api*sizeof(void*))                     \
58            : "r12"                                             \
59            );
60
61#elif defined(__aarch64__)
62
63    #define API_ENTRY(_api) __attribute__((noinline)) _api
64
65    #define CALL_GL_EXTENSION_API(_api)                             \
66        asm volatile(                                               \
67            "mrs x16, tpidr_el0\n"                                  \
68            "ldr x16, [x16, %[tls]]\n"                              \
69            "cbz x16, 1f\n"                                         \
70            "ldr x16, [x16, %[api]]\n"                              \
71            "cbz x16, 1f\n"                                         \
72            "br  x16\n"                                             \
73            "1:\n"                                                  \
74            :                                                       \
75            : [tls] "i" (TLS_SLOT_OPENGL_API * sizeof(void*)),      \
76              [api] "i" (__builtin_offsetof(gl_hooks_t,             \
77                                        ext.extensions[_api]))      \
78            : "x16"                                                 \
79        );
80
81#elif defined(__i386__)
82
83    #define API_ENTRY(_api) __attribute__((naked)) _api
84
85    #define CALL_GL_EXTENSION_API(_api)                         \
86         __asm__ volatile(                                      \
87            "mov %%gs:0, %%eax\n"                               \
88            "mov %P[tls](%%eax), %%eax\n"                       \
89            "test %%eax, %%eax\n"                               \
90            "cmovne %P[api](%%eax), %%eax\n"                    \
91            "test %%eax, %%eax\n"                               \
92            "je 1f\n"                                           \
93            "jmp *%%eax\n"                                      \
94            "1: ret\n"                                          \
95            :                                                   \
96            : [tls] "i" (TLS_SLOT_OPENGL_API*sizeof(void*)),    \
97              [api] "i" (__builtin_offsetof(gl_hooks_t,         \
98                                      ext.extensions[_api]))    \
99            : "eax", "cc"                                       \
100            );
101
102#elif defined(__x86_64__)
103
104    #define API_ENTRY(_api) __attribute__((naked)) _api
105
106    #define CALL_GL_EXTENSION_API(_api)                         \
107         __asm__ volatile(                                      \
108            "mov %%fs:0, %%rax\n"                               \
109            "mov %P[tls](%%rax), %%rax\n"                       \
110            "test %%rax, %%rax\n"                               \
111            "cmovne %P[api](%%rax), %%rax\n"                    \
112            "test %%rax, %%rax\n"                               \
113            "je 1f\n"                                           \
114            "jmp *%%rax\n"                                      \
115            "1: ret\n"                                          \
116            :                                                   \
117            : [tls] "i" (TLS_SLOT_OPENGL_API*sizeof(void*)),    \
118              [api] "i" (__builtin_offsetof(gl_hooks_t,         \
119                                      ext.extensions[_api]))    \
120            : "rax", "cc"                                       \
121            );
122
123#elif defined(__mips64)
124
125        #define API_ENTRY(_api) __attribute__((noinline)) _api
126
127        #define CALL_GL_EXTENSION_API(_api, ...)                    \
128            register unsigned int _t0 asm("$12");                   \
129            register unsigned int _fn asm("$25");                   \
130            register unsigned int _tls asm("$3");                   \
131            asm volatile(                                           \
132                ".set  push\n\t"                                    \
133                ".set  noreorder\n\t"                               \
134                "rdhwr %[tls], $29\n\t"                             \
135                "ld    %[t0], %[OPENGL_API](%[tls])\n\t"            \
136                "beqz  %[t0], 1f\n\t"                               \
137                " move %[fn], $ra\n\t"                              \
138                "ld    %[t0], %[API](%[t0])\n\t"                    \
139                "beqz  %[t0], 1f\n\t"                               \
140                " nop\n\t"                                          \
141                "move  %[fn], %[t0]\n\t"                            \
142                "1:\n\t"                                            \
143                "jalr  $0, %[fn]\n\t"                               \
144                " nop\n\t"                                          \
145                ".set  pop\n\t"                                     \
146                : [fn] "=c"(_fn),                                   \
147                  [tls] "=&r"(_tls),                                \
148                  [t0] "=&r"(_t0)                                   \
149                : [OPENGL_API] "I"(TLS_SLOT_OPENGL_API*4),          \
150                  [API] "I"(__builtin_offsetof(gl_hooks_t,          \
151                                          ext.extensions[_api]))    \
152                :                                                   \
153            );
154
155#elif defined(__mips__)
156
157        #define API_ENTRY(_api) __attribute__((noinline)) _api
158
159        #define CALL_GL_EXTENSION_API(_api, ...)                    \
160            register unsigned int _t0 asm("$8");                    \
161            register unsigned int _fn asm("$25");                    \
162            register unsigned int _tls asm("$3");                   \
163            asm volatile(                                           \
164                ".set  push\n\t"                                    \
165                ".set  noreorder\n\t"                               \
166                ".set  mips32r2\n\t"                                \
167                "rdhwr %[tls], $29\n\t"                             \
168                "lw    %[t0], %[OPENGL_API](%[tls])\n\t"            \
169                "beqz  %[t0], 1f\n\t"                               \
170                " move %[fn], $ra\n\t"                              \
171                "lw    %[t0], %[API](%[t0])\n\t"                    \
172                "beqz  %[t0], 1f\n\t"                               \
173                " nop\n\t"                                          \
174                "move  %[fn], %[t0]\n\t"                            \
175                "1:\n\t"                                            \
176                "jalr  $0, %[fn]\n\t"                               \
177                " nop\n\t"                                          \
178                ".set  pop\n\t"                                     \
179                : [fn] "=c"(_fn),                                   \
180                  [tls] "=&r"(_tls),                                \
181                  [t0] "=&r"(_t0)                                   \
182                : [OPENGL_API] "I"(TLS_SLOT_OPENGL_API*4),          \
183                  [API] "I"(__builtin_offsetof(gl_hooks_t,          \
184                                          ext.extensions[_api]))    \
185                :                                                   \
186            );
187
188#endif
189
190#if defined(CALL_GL_EXTENSION_API)
191    #define GL_EXTENSION_NAME(_n)   __glExtFwd##_n
192
193    #define GL_EXTENSION(_n)                         \
194        void API_ENTRY(GL_EXTENSION_NAME(_n))() {    \
195            CALL_GL_EXTENSION_API(_n);               \
196        }
197#else
198        #define GL_EXTENSION_NAME(_n) NULL
199
200        #define GL_EXTENSION(_n)
201
202        #warning "eglGetProcAddress() partially supported"
203#endif
204
205
206#define GL_EXTENSION_LIST(name) \
207    name(0)   name(1)   name(2)   name(3)   name(4)   name(5)   name(6)   name(7)  \
208    name(8)   name(9)   name(10)  name(11)  name(12)  name(13)  name(14)  name(15) \
209    name(16)  name(17)  name(18)  name(19)  name(20)  name(21)  name(22)  name(23) \
210    name(24)  name(25)  name(26)  name(27)  name(28)  name(29)  name(30)  name(31) \
211    name(32)  name(33)  name(34)  name(35)  name(36)  name(37)  name(38)  name(39) \
212    name(40)  name(41)  name(42)  name(43)  name(44)  name(45)  name(46)  name(47) \
213    name(48)  name(49)  name(50)  name(51)  name(52)  name(53)  name(54)  name(55) \
214    name(56)  name(57)  name(58)  name(59)  name(60)  name(61)  name(62)  name(63) \
215    name(64)  name(65)  name(66)  name(67)  name(68)  name(69)  name(70)  name(71) \
216    name(72)  name(73)  name(74)  name(75)  name(76)  name(77)  name(78)  name(79) \
217    name(80)  name(81)  name(82)  name(83)  name(84)  name(85)  name(86)  name(87) \
218    name(88)  name(89)  name(90)  name(91)  name(92)  name(93)  name(94)  name(95) \
219    name(96)  name(97)  name(98)  name(99)  \
220    name(100) name(101) name(102) name(103) name(104) name(105) name(106) name(107) \
221    name(108) name(109) name(110) name(111) name(112) name(113) name(114) name(115) \
222    name(116) name(117) name(118) name(119) name(120) name(121) name(122) name(123) \
223    name(124) name(125) name(126) name(127) name(128) name(129) name(130) name(131) \
224    name(132) name(133) name(134) name(135) name(136) name(137) name(138) name(139) \
225    name(140) name(141) name(142) name(143) name(144) name(145) name(146) name(147) \
226    name(148) name(149) name(150) name(151) name(152) name(153) name(154) name(155) \
227    name(156) name(157) name(158) name(159) name(160) name(161) name(162) name(163) \
228    name(164) name(165) name(166) name(167) name(168) name(169) name(170) name(171) \
229    name(172) name(173) name(174) name(175) name(176) name(177) name(178) name(179) \
230    name(180) name(181) name(182) name(183) name(184) name(185) name(186) name(187) \
231    name(188) name(189) name(190) name(191) name(192) name(193) name(194) name(195) \
232    name(196) name(197) name(198) name(199) \
233    name(200) name(201) name(202) name(203) name(204) name(205) name(206) name(207) \
234    name(208) name(209) name(210) name(211) name(212) name(213) name(214) name(215) \
235    name(216) name(217) name(218) name(219) name(220) name(221) name(222) name(223) \
236    name(224) name(225) name(226) name(227) name(228) name(229) name(230) name(231) \
237    name(232) name(233) name(234) name(235) name(236) name(237) name(238) name(239) \
238    name(240) name(241) name(242) name(243) name(244) name(245) name(246) name(247) \
239    name(248) name(249) name(250) name(251) name(252) name(253) name(254) name(255)
240
241
242GL_EXTENSION_LIST( GL_EXTENSION )
243
244#define GL_EXTENSION_ARRAY(_n)  GL_EXTENSION_NAME(_n),
245
246extern const __eglMustCastToProperFunctionPointerType gExtensionForwarders[MAX_NUMBER_OF_GL_EXTENSIONS] = {
247        GL_EXTENSION_LIST( GL_EXTENSION_ARRAY )
248 };
249
250#undef GET_TLS
251#undef GL_EXTENSION_LIST
252#undef GL_EXTENSION_ARRAY
253#undef GL_EXTENSION_NAME
254#undef GL_EXTENSION
255#undef API_ENTRY
256#undef CALL_GL_EXTENSION_API
257
258// ----------------------------------------------------------------------------
259}; // namespace android
260// ----------------------------------------------------------------------------
261
262