getProcAddress.cpp revision 30a41aa1ccc47de41642308a243fa5df2bfeec06
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 : "r12" \ 57 ); 58 59#elif defined(__aarch64__) 60 61 #define API_ENTRY(_api) __attribute__((noinline)) _api 62 63 #define CALL_GL_EXTENSION_API(_api) \ 64 asm volatile( \ 65 "mrs x16, tpidr_el0\n" \ 66 "ldr x16, [x16, %[tls]]\n" \ 67 "cbz x16, 1f\n" \ 68 "ldr x16, [x16, %[api]]\n" \ 69 "cbz x16, 1f\n" \ 70 "br x16\n" \ 71 "1:\n" \ 72 : \ 73 : [tls] "i" (TLS_SLOT_OPENGL_API * sizeof(void*)), \ 74 [api] "i" (__builtin_offsetof(gl_hooks_t, \ 75 ext.extensions[_api])) \ 76 : "x16" \ 77 ); 78 79#elif defined(__i386__) 80 81 #define API_ENTRY(_api) __attribute__((noinline)) _api 82 83 #define CALL_GL_EXTENSION_API(_api) \ 84 register void** fn; \ 85 __asm__ volatile( \ 86 "mov %%gs:0, %[fn]\n" \ 87 "mov %P[tls](%[fn]), %[fn]\n" \ 88 "test %[fn], %[fn]\n" \ 89 "cmovne %P[api](%[fn]), %[fn]\n" \ 90 "test %[fn], %[fn]\n" \ 91 "je 1f\n" \ 92 "jmp *%[fn]\n" \ 93 "1:\n" \ 94 : [fn] "=r" (fn) \ 95 : [tls] "i" (TLS_SLOT_OPENGL_API*sizeof(void*)), \ 96 [api] "i" (__builtin_offsetof(gl_hooks_t, \ 97 ext.extensions[_api])) \ 98 : "cc" \ 99 ); 100 101#elif defined(__x86_64__) 102 103 #define API_ENTRY(_api) __attribute__((noinline)) _api 104 105 #define CALL_GL_EXTENSION_API(_api) \ 106 register void** fn; \ 107 __asm__ volatile( \ 108 "mov %%fs:0, %[fn]\n" \ 109 "mov %P[tls](%[fn]), %[fn]\n" \ 110 "test %[fn], %[fn]\n" \ 111 "cmovne %P[api](%[fn]), %[fn]\n" \ 112 "test %[fn], %[fn]\n" \ 113 "je 1f\n" \ 114 "jmp *%[fn]\n" \ 115 "1:\n" \ 116 : [fn] "=r" (fn) \ 117 : [tls] "i" (TLS_SLOT_OPENGL_API*sizeof(void*)), \ 118 [api] "i" (__builtin_offsetof(gl_hooks_t, \ 119 ext.extensions[_api])) \ 120 : "cc" \ 121 ); 122 123#elif defined(__mips__) 124 125 #define API_ENTRY(_api) __attribute__((noinline)) _api 126 127 #define CALL_GL_EXTENSION_API(_api, ...) \ 128 register unsigned int _t0 asm("t0"); \ 129 register unsigned int _fn asm("t1"); \ 130 register unsigned int _tls asm("v1"); \ 131 asm volatile( \ 132 ".set push\n\t" \ 133 ".set noreorder\n\t" \ 134 ".set mips32r2\n\t" \ 135 "rdhwr %[tls], $29\n\t" \ 136 "lw %[t0], %[OPENGL_API](%[tls])\n\t" \ 137 "beqz %[t0], 1f\n\t" \ 138 " move %[fn], $ra\n\t" \ 139 "lw %[fn], %[API](%[t0])\n\t" \ 140 "movz %[fn], $ra, %[fn]\n\t" \ 141 "1:\n\t" \ 142 "j %[fn]\n\t" \ 143 " nop\n\t" \ 144 ".set pop\n\t" \ 145 : [fn] "=c"(_fn), \ 146 [tls] "=&r"(_tls), \ 147 [t0] "=&r"(_t0) \ 148 : [OPENGL_API] "I"(TLS_SLOT_OPENGL_API*4), \ 149 [API] "I"(__builtin_offsetof(gl_hooks_t, \ 150 ext.extensions[_api])) \ 151 : \ 152 ); 153 154#endif 155 156#if defined(CALL_GL_EXTENSION_API) 157 #define GL_EXTENSION_NAME(_n) __glExtFwd##_n 158 159 #define GL_EXTENSION(_n) \ 160 void API_ENTRY(GL_EXTENSION_NAME(_n))() { \ 161 CALL_GL_EXTENSION_API(_n); \ 162 } 163#else 164 #define GL_EXTENSION_NAME(_n) NULL 165 166 #define GL_EXTENSION(_n) 167 168 #warning "eglGetProcAddress() partially supported" 169#endif 170 171 172#define GL_EXTENSION_LIST(name) \ 173 name(0) name(1) name(2) name(3) name(4) name(5) name(6) name(7) \ 174 name(8) name(9) name(10) name(11) name(12) name(13) name(14) name(15) \ 175 name(16) name(17) name(18) name(19) name(20) name(21) name(22) name(23) \ 176 name(24) name(25) name(26) name(27) name(28) name(29) name(30) name(31) \ 177 name(32) name(33) name(34) name(35) name(36) name(37) name(38) name(39) \ 178 name(40) name(41) name(42) name(43) name(44) name(45) name(46) name(47) \ 179 name(48) name(49) name(50) name(51) name(52) name(53) name(54) name(55) \ 180 name(56) name(57) name(58) name(59) name(60) name(61) name(62) name(63) \ 181 name(64) name(65) name(66) name(67) name(68) name(69) name(70) name(71) \ 182 name(72) name(73) name(74) name(75) name(76) name(77) name(78) name(79) \ 183 name(80) name(81) name(82) name(83) name(84) name(85) name(86) name(87) \ 184 name(88) name(89) name(90) name(91) name(92) name(93) name(94) name(95) \ 185 name(96) name(97) name(98) name(99) \ 186 name(100) name(101) name(102) name(103) name(104) name(105) name(106) name(107) \ 187 name(108) name(109) name(110) name(111) name(112) name(113) name(114) name(115) \ 188 name(116) name(117) name(118) name(119) name(120) name(121) name(122) name(123) \ 189 name(124) name(125) name(126) name(127) name(128) name(129) name(130) name(131) \ 190 name(132) name(133) name(134) name(135) name(136) name(137) name(138) name(139) \ 191 name(140) name(141) name(142) name(143) name(144) name(145) name(146) name(147) \ 192 name(148) name(149) name(150) name(151) name(152) name(153) name(154) name(155) \ 193 name(156) name(157) name(158) name(159) name(160) name(161) name(162) name(163) \ 194 name(164) name(165) name(166) name(167) name(168) name(169) name(170) name(171) \ 195 name(172) name(173) name(174) name(175) name(176) name(177) name(178) name(179) \ 196 name(180) name(181) name(182) name(183) name(184) name(185) name(186) name(187) \ 197 name(188) name(189) name(190) name(191) name(192) name(193) name(194) name(195) \ 198 name(196) name(197) name(198) name(199) \ 199 name(200) name(201) name(202) name(203) name(204) name(205) name(206) name(207) \ 200 name(208) name(209) name(210) name(211) name(212) name(213) name(214) name(215) \ 201 name(216) name(217) name(218) name(219) name(220) name(221) name(222) name(223) \ 202 name(224) name(225) name(226) name(227) name(228) name(229) name(230) name(231) \ 203 name(232) name(233) name(234) name(235) name(236) name(237) name(238) name(239) \ 204 name(240) name(241) name(242) name(243) name(244) name(245) name(246) name(247) \ 205 name(248) name(249) name(250) name(251) name(252) name(253) name(254) name(255) 206 207 208GL_EXTENSION_LIST( GL_EXTENSION ) 209 210#define GL_EXTENSION_ARRAY(_n) GL_EXTENSION_NAME(_n), 211 212extern const __eglMustCastToProperFunctionPointerType gExtensionForwarders[MAX_NUMBER_OF_GL_EXTENSIONS] = { 213 GL_EXTENSION_LIST( GL_EXTENSION_ARRAY ) 214 }; 215 216#undef GET_TLS 217#undef GL_EXTENSION_LIST 218#undef GL_EXTENSION_ARRAY 219#undef GL_EXTENSION_NAME 220#undef GL_EXTENSION 221#undef API_ENTRY 222#undef CALL_GL_EXTENSION_API 223 224// ---------------------------------------------------------------------------- 225}; // namespace android 226// ---------------------------------------------------------------------------- 227 228