getProcAddress.cpp revision c80aafa61d619087a879dc1095ddf1ca2a5e69fb
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 <stdlib.h> 19#include <errno.h> 20 21#include <cutils/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 "ldrne r12, [r12, %[api]] \n" \ 49 "cmpne r12, #0 \n" \ 50 "bxne r12 \n" \ 51 "bx lr \n" \ 52 : \ 53 : [tls] "J"(TLS_SLOT_OPENGL_API*4), \ 54 [api] "J"(__builtin_offsetof(gl_hooks_t, \ 55 ext.extensions[_api])) \ 56 : \ 57 ); 58 59#elif defined(__i386__) 60 61 #define API_ENTRY(_api) __attribute__((noinline)) _api 62 63 #define CALL_GL_EXTENSION_API(_api) \ 64 register void** fn; \ 65 __asm__ volatile( \ 66 "mov %%gs:0, %[fn]\n" \ 67 "mov %P[tls](%[fn]), %[fn]\n" \ 68 "test %[fn], %[fn]\n" \ 69 "cmovne %P[api](%[fn]), %[fn]\n" \ 70 "test %[fn], %[fn]\n" \ 71 "je 1f\n" \ 72 "jmp *%[fn]\n" \ 73 "1:\n" \ 74 : [fn] "=r" (fn) \ 75 : [tls] "i" (TLS_SLOT_OPENGL_API*sizeof(void*)), \ 76 [api] "i" (__builtin_offsetof(gl_hooks_t, \ 77 ext.extensions[_api])) \ 78 : "cc" \ 79 ); 80 81#elif defined(__x86_64__) 82 83 #define API_ENTRY(_api) __attribute__((noinline)) _api 84 85 #define CALL_GL_EXTENSION_API(_api) \ 86 register void** fn; \ 87 __asm__ volatile( \ 88 "mov %%fs:0, %[fn]\n" \ 89 "mov %P[tls](%[fn]), %[fn]\n" \ 90 "test %[fn], %[fn]\n" \ 91 "cmovne %P[api](%[fn]), %[fn]\n" \ 92 "test %[fn], %[fn]\n" \ 93 "je 1f\n" \ 94 "jmp *%[fn]\n" \ 95 "1:\n" \ 96 : [fn] "=r" (fn) \ 97 : [tls] "i" (TLS_SLOT_OPENGL_API*sizeof(void*)), \ 98 [api] "i" (__builtin_offsetof(gl_hooks_t, \ 99 ext.extensions[_api])) \ 100 : "cc" \ 101 ); 102 103#elif defined(__mips__) 104 105 #define API_ENTRY(_api) __attribute__((noinline)) _api 106 107 #define CALL_GL_EXTENSION_API(_api, ...) \ 108 register unsigned int _t0 asm("t0"); \ 109 register unsigned int _fn asm("t1"); \ 110 register unsigned int _tls asm("v1"); \ 111 asm volatile( \ 112 ".set push\n\t" \ 113 ".set noreorder\n\t" \ 114 ".set mips32r2\n\t" \ 115 "rdhwr %[tls], $29\n\t" \ 116 "lw %[t0], %[OPENGL_API](%[tls])\n\t" \ 117 "beqz %[t0], 1f\n\t" \ 118 " move %[fn], $ra\n\t" \ 119 "lw %[fn], %[API](%[t0])\n\t" \ 120 "movz %[fn], $ra, %[fn]\n\t" \ 121 "1:\n\t" \ 122 "j %[fn]\n\t" \ 123 " nop\n\t" \ 124 ".set pop\n\t" \ 125 : [fn] "=c"(_fn), \ 126 [tls] "=&r"(_tls), \ 127 [t0] "=&r"(_t0) \ 128 : [OPENGL_API] "I"(TLS_SLOT_OPENGL_API*4), \ 129 [API] "I"(__builtin_offsetof(gl_hooks_t, \ 130 ext.extensions[_api])) \ 131 : \ 132 ); 133 134#endif 135 136#if defined(CALL_GL_EXTENSION_API) 137 #define GL_EXTENSION_NAME(_n) __glExtFwd##_n 138 139 #define GL_EXTENSION(_n) \ 140 void API_ENTRY(GL_EXTENSION_NAME(_n))() { \ 141 CALL_GL_EXTENSION_API(_n); \ 142 } 143#else 144 #define GL_EXTENSION_NAME(_n) NULL 145 146 #define GL_EXTENSION(_n) 147 148 #warning "eglGetProcAddress() partially supported" 149#endif 150 151 152#define GL_EXTENSION_LIST(name) \ 153 name(0) name(1) name(2) name(3) name(4) name(5) name(6) name(7) \ 154 name(8) name(9) name(10) name(11) name(12) name(13) name(14) name(15) \ 155 name(16) name(17) name(18) name(19) name(20) name(21) name(22) name(23) \ 156 name(24) name(25) name(26) name(27) name(28) name(29) name(30) name(31) \ 157 name(32) name(33) name(34) name(35) name(36) name(37) name(38) name(39) \ 158 name(40) name(41) name(42) name(43) name(44) name(45) name(46) name(47) \ 159 name(48) name(49) name(50) name(51) name(52) name(53) name(54) name(55) \ 160 name(56) name(57) name(58) name(59) name(60) name(61) name(62) name(63) \ 161 name(64) name(65) name(66) name(67) name(68) name(69) name(70) name(71) \ 162 name(72) name(73) name(74) name(75) name(76) name(77) name(78) name(79) \ 163 name(80) name(81) name(82) name(83) name(84) name(85) name(86) name(87) \ 164 name(88) name(89) name(90) name(91) name(92) name(93) name(94) name(95) \ 165 name(96) name(97) name(98) name(99) \ 166 name(100) name(101) name(102) name(103) name(104) name(105) name(106) name(107) \ 167 name(108) name(109) name(110) name(111) name(112) name(113) name(114) name(115) \ 168 name(116) name(117) name(118) name(119) name(120) name(121) name(122) name(123) \ 169 name(124) name(125) name(126) name(127) name(128) name(129) name(130) name(131) \ 170 name(132) name(133) name(134) name(135) name(136) name(137) name(138) name(139) \ 171 name(140) name(141) name(142) name(143) name(144) name(145) name(146) name(147) \ 172 name(148) name(149) name(150) name(151) name(152) name(153) name(154) name(155) \ 173 name(156) name(157) name(158) name(159) name(160) name(161) name(162) name(163) \ 174 name(164) name(165) name(166) name(167) name(168) name(169) name(170) name(171) \ 175 name(172) name(173) name(174) name(175) name(176) name(177) name(178) name(179) \ 176 name(180) name(181) name(182) name(183) name(184) name(185) name(186) name(187) \ 177 name(188) name(189) name(190) name(191) name(192) name(193) name(194) name(195) \ 178 name(196) name(197) name(198) name(199) \ 179 name(200) name(201) name(202) name(203) name(204) name(205) name(206) name(207) \ 180 name(208) name(209) name(210) name(211) name(212) name(213) name(214) name(215) \ 181 name(216) name(217) name(218) name(219) name(220) name(221) name(222) name(223) \ 182 name(224) name(225) name(226) name(227) name(228) name(229) name(230) name(231) \ 183 name(232) name(233) name(234) name(235) name(236) name(237) name(238) name(239) \ 184 name(240) name(241) name(242) name(243) name(244) name(245) name(246) name(247) \ 185 name(248) name(249) name(250) name(251) name(252) name(253) name(254) name(255) 186 187 188GL_EXTENSION_LIST( GL_EXTENSION ) 189 190#define GL_EXTENSION_ARRAY(_n) GL_EXTENSION_NAME(_n), 191 192extern const __eglMustCastToProperFunctionPointerType gExtensionForwarders[MAX_NUMBER_OF_GL_EXTENSIONS] = { 193 GL_EXTENSION_LIST( GL_EXTENSION_ARRAY ) 194 }; 195 196#undef GET_TLS 197#undef GL_EXTENSION_LIST 198#undef GL_EXTENSION_ARRAY 199#undef GL_EXTENSION_NAME 200#undef GL_EXTENSION 201#undef API_ENTRY 202#undef CALL_GL_EXTENSION_API 203 204// ---------------------------------------------------------------------------- 205}; // namespace android 206// ---------------------------------------------------------------------------- 207 208