Brent Austin | ba3052e | 2015-04-21 16:08:23 -0700 | [diff] [blame^] | 1 | // Copyright 2010 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | #include "runtime.h" |
| 6 | #include "os_GOOS.h" |
| 7 | #include "arch_GOARCH.h" |
| 8 | #include "textflag.h" |
| 9 | #include "malloc.h" |
| 10 | |
| 11 | int8 *goos = "plan9"; |
| 12 | extern SigTab runtime·sigtab[]; |
| 13 | |
| 14 | int32 runtime·postnote(int32, int8*); |
| 15 | |
| 16 | // Called to initialize a new m (including the bootstrap m). |
| 17 | // Called on the parent thread (main thread in case of bootstrap), can allocate memory. |
| 18 | void |
| 19 | runtime·mpreinit(M *mp) |
| 20 | { |
| 21 | // Initialize stack and goroutine for note handling. |
| 22 | mp->gsignal = runtime·malg(32*1024); |
| 23 | mp->gsignal->m = mp; |
| 24 | mp->notesig = (int8*)runtime·mallocgc(ERRMAX*sizeof(int8), nil, FlagNoScan); |
| 25 | |
| 26 | // Initialize stack for handling strings from the |
| 27 | // errstr system call, as used in package syscall. |
| 28 | mp->errstr = (byte*)runtime·mallocgc(ERRMAX*sizeof(byte), nil, FlagNoScan); |
| 29 | } |
| 30 | |
| 31 | // Called to initialize a new m (including the bootstrap m). |
| 32 | // Called on the new thread, can not allocate memory. |
| 33 | void |
| 34 | runtime·minit(void) |
| 35 | { |
| 36 | // Mask all SSE floating-point exceptions |
| 37 | // when running on the 64-bit kernel. |
| 38 | runtime·setfpmasks(); |
| 39 | } |
| 40 | |
| 41 | // Called from dropm to undo the effect of an minit. |
| 42 | void |
| 43 | runtime·unminit(void) |
| 44 | { |
| 45 | } |
| 46 | |
| 47 | |
| 48 | static int32 |
| 49 | getproccount(void) |
| 50 | { |
| 51 | int32 fd, i, n, ncpu; |
| 52 | byte buf[2048]; |
| 53 | |
| 54 | fd = runtime·open("/dev/sysstat", OREAD, 0); |
| 55 | if(fd < 0) |
| 56 | return 1; |
| 57 | ncpu = 0; |
| 58 | for(;;) { |
| 59 | n = runtime·read(fd, buf, sizeof buf); |
| 60 | if(n <= 0) |
| 61 | break; |
| 62 | for(i = 0; i < n; i++) { |
| 63 | if(buf[i] == '\n') |
| 64 | ncpu++; |
| 65 | } |
| 66 | } |
| 67 | runtime·close(fd); |
| 68 | return ncpu > 0 ? ncpu : 1; |
| 69 | } |
| 70 | |
| 71 | static int32 |
| 72 | getpid(void) |
| 73 | { |
| 74 | byte b[20], *c; |
| 75 | int32 fd; |
| 76 | |
| 77 | runtime·memclr(b, sizeof(b)); |
| 78 | fd = runtime·open("#c/pid", 0, 0); |
| 79 | if(fd >= 0) { |
| 80 | runtime·read(fd, b, sizeof(b)); |
| 81 | runtime·close(fd); |
| 82 | } |
| 83 | c = b; |
| 84 | while(*c == ' ' || *c == '\t') |
| 85 | c++; |
| 86 | return runtime·atoi(c); |
| 87 | } |
| 88 | |
| 89 | void |
| 90 | runtime·osinit(void) |
| 91 | { |
| 92 | runtime·ncpu = getproccount(); |
| 93 | g->m->procid = getpid(); |
| 94 | runtime·notify(runtime·sigtramp); |
| 95 | } |
| 96 | |
| 97 | void |
| 98 | runtime·crash(void) |
| 99 | { |
| 100 | runtime·notify(nil); |
| 101 | *(int32*)0 = 0; |
| 102 | } |
| 103 | |
| 104 | #pragma textflag NOSPLIT |
| 105 | void |
| 106 | runtime·get_random_data(byte **rnd, int32 *rnd_len) |
| 107 | { |
| 108 | static byte random_data[HashRandomBytes]; |
| 109 | int32 fd; |
| 110 | |
| 111 | fd = runtime·open("/dev/random", 0 /* O_RDONLY */, 0); |
| 112 | if(runtime·read(fd, random_data, HashRandomBytes) == HashRandomBytes) { |
| 113 | *rnd = random_data; |
| 114 | *rnd_len = HashRandomBytes; |
| 115 | } else { |
| 116 | *rnd = nil; |
| 117 | *rnd_len = 0; |
| 118 | } |
| 119 | runtime·close(fd); |
| 120 | } |
| 121 | |
| 122 | void |
| 123 | runtime·goenvs(void) |
| 124 | { |
| 125 | } |
| 126 | |
| 127 | void |
| 128 | runtime·initsig(void) |
| 129 | { |
| 130 | } |
| 131 | |
| 132 | #pragma textflag NOSPLIT |
| 133 | void |
| 134 | runtime·osyield(void) |
| 135 | { |
| 136 | runtime·sleep(0); |
| 137 | } |
| 138 | |
| 139 | #pragma textflag NOSPLIT |
| 140 | void |
| 141 | runtime·usleep(uint32 µs) |
| 142 | { |
| 143 | uint32 ms; |
| 144 | |
| 145 | ms = µs/1000; |
| 146 | if(ms == 0) |
| 147 | ms = 1; |
| 148 | runtime·sleep(ms); |
| 149 | } |
| 150 | |
| 151 | #pragma textflag NOSPLIT |
| 152 | int64 |
| 153 | runtime·nanotime(void) |
| 154 | { |
| 155 | int64 ns, scratch; |
| 156 | |
| 157 | ns = runtime·nsec(&scratch); |
| 158 | // TODO(aram): remove hack after I fix _nsec in the pc64 kernel. |
| 159 | if(ns == 0) |
| 160 | return scratch; |
| 161 | return ns; |
| 162 | } |
| 163 | |
| 164 | #pragma textflag NOSPLIT |
| 165 | void |
| 166 | runtime·itoa(int32 n, byte *p, uint32 len) |
| 167 | { |
| 168 | byte *q, c; |
| 169 | uint32 i; |
| 170 | |
| 171 | if(len <= 1) |
| 172 | return; |
| 173 | |
| 174 | runtime·memclr(p, len); |
| 175 | q = p; |
| 176 | |
| 177 | if(n==0) { |
| 178 | *q++ = '0'; |
| 179 | USED(q); |
| 180 | return; |
| 181 | } |
| 182 | if(n < 0) { |
| 183 | *q++ = '-'; |
| 184 | p++; |
| 185 | n = -n; |
| 186 | } |
| 187 | for(i=0; n > 0 && i < len; i++) { |
| 188 | *q++ = '0' + (n%10); |
| 189 | n = n/10; |
| 190 | } |
| 191 | for(q--; q >= p; ) { |
| 192 | c = *p; |
| 193 | *p++ = *q; |
| 194 | *q-- = c; |
| 195 | } |
| 196 | } |
| 197 | |
| 198 | void |
| 199 | runtime·goexitsall(int8 *status) |
| 200 | { |
| 201 | int8 buf[ERRMAX]; |
| 202 | M *mp; |
| 203 | int32 pid; |
| 204 | |
| 205 | runtime·snprintf((byte*)buf, sizeof buf, "go: exit %s", status); |
| 206 | pid = getpid(); |
| 207 | for(mp=runtime·atomicloadp(&runtime·allm); mp; mp=mp->alllink) |
| 208 | if(mp->procid != pid) |
| 209 | runtime·postnote(mp->procid, buf); |
| 210 | } |
| 211 | |
| 212 | int32 |
| 213 | runtime·postnote(int32 pid, int8* msg) |
| 214 | { |
| 215 | int32 fd; |
| 216 | intgo len; |
| 217 | uint8 buf[128]; |
| 218 | uint8 tmp[16]; |
| 219 | uint8 *p, *q; |
| 220 | |
| 221 | runtime·memclr(buf, sizeof buf); |
| 222 | |
| 223 | /* build path string /proc/pid/note */ |
| 224 | q = tmp; |
| 225 | p = buf; |
| 226 | runtime·itoa(pid, tmp, sizeof tmp); |
| 227 | runtime·memmove((void*)p, (void*)"/proc/", 6); |
| 228 | for(p += 6; *p++ = *q++; ); |
| 229 | p--; |
| 230 | runtime·memmove((void*)p, (void*)"/note", 5); |
| 231 | |
| 232 | fd = runtime·open((int8*)buf, OWRITE, 0); |
| 233 | if(fd < 0) |
| 234 | return -1; |
| 235 | |
| 236 | len = runtime·findnull((byte*)msg); |
| 237 | if(runtime·write(fd, msg, len) != len) { |
| 238 | runtime·close(fd); |
| 239 | return -1; |
| 240 | } |
| 241 | runtime·close(fd); |
| 242 | return 0; |
| 243 | } |
| 244 | |
| 245 | static void exit(void); |
| 246 | |
| 247 | #pragma textflag NOSPLIT |
| 248 | void |
| 249 | runtime·exit(int32 e) |
| 250 | { |
| 251 | void (*fn)(void); |
| 252 | |
| 253 | g->m->scalararg[0] = e; |
| 254 | fn = exit; |
| 255 | runtime·onM(&fn); |
| 256 | } |
| 257 | |
| 258 | static void |
| 259 | exit(void) |
| 260 | { |
| 261 | int32 e; |
| 262 | byte tmp[16]; |
| 263 | int8 *status; |
| 264 | |
| 265 | e = g->m->scalararg[0]; |
| 266 | g->m->scalararg[0] = 0; |
| 267 | |
| 268 | if(e == 0) |
| 269 | status = ""; |
| 270 | else { |
| 271 | /* build error string */ |
| 272 | runtime·itoa(e, tmp, sizeof tmp); |
| 273 | status = (int8*)tmp; |
| 274 | } |
| 275 | |
| 276 | runtime·goexitsall(status); |
| 277 | runtime·exits(status); |
| 278 | } |
| 279 | |
| 280 | void |
| 281 | runtime·newosproc(M *mp, void *stk) |
| 282 | { |
| 283 | int32 pid; |
| 284 | |
| 285 | if(0) |
| 286 | runtime·printf("newosproc mp=%p ostk=%p\n", mp, &mp); |
| 287 | |
| 288 | USED(stk); |
| 289 | if((pid = runtime·rfork(RFPROC|RFMEM|RFNOWAIT)) < 0) |
| 290 | runtime·throw("newosproc: rfork failed\n"); |
| 291 | if(pid == 0) |
| 292 | runtime·tstart_plan9(mp); |
| 293 | } |
| 294 | |
| 295 | #pragma textflag NOSPLIT |
| 296 | uintptr |
| 297 | runtime·semacreate(void) |
| 298 | { |
| 299 | return 1; |
| 300 | } |
| 301 | |
| 302 | #pragma textflag NOSPLIT |
| 303 | int32 |
| 304 | runtime·semasleep(int64 ns) |
| 305 | { |
| 306 | int32 ret; |
| 307 | int32 ms; |
| 308 | |
| 309 | if(ns >= 0) { |
| 310 | ms = runtime·timediv(ns, 1000000, nil); |
| 311 | if(ms == 0) |
| 312 | ms = 1; |
| 313 | ret = runtime·plan9_tsemacquire(&g->m->waitsemacount, ms); |
| 314 | if(ret == 1) |
| 315 | return 0; // success |
| 316 | return -1; // timeout or interrupted |
| 317 | } |
| 318 | |
| 319 | while(runtime·plan9_semacquire(&g->m->waitsemacount, 1) < 0) { |
| 320 | /* interrupted; try again (c.f. lock_sema.c) */ |
| 321 | } |
| 322 | return 0; // success |
| 323 | } |
| 324 | |
| 325 | #pragma textflag NOSPLIT |
| 326 | void |
| 327 | runtime·semawakeup(M *mp) |
| 328 | { |
| 329 | runtime·plan9_semrelease(&mp->waitsemacount, 1); |
| 330 | } |
| 331 | |
| 332 | #pragma textflag NOSPLIT |
| 333 | int32 |
| 334 | runtime·read(int32 fd, void *buf, int32 nbytes) |
| 335 | { |
| 336 | return runtime·pread(fd, buf, nbytes, -1LL); |
| 337 | } |
| 338 | |
| 339 | #pragma textflag NOSPLIT |
| 340 | int32 |
| 341 | runtime·write(uintptr fd, void *buf, int32 nbytes) |
| 342 | { |
| 343 | return runtime·pwrite((int32)fd, buf, nbytes, -1LL); |
| 344 | } |
| 345 | |
| 346 | uintptr |
| 347 | runtime·memlimit(void) |
| 348 | { |
| 349 | return 0; |
| 350 | } |
| 351 | |
| 352 | #pragma dataflag NOPTR |
| 353 | static int8 badsignal[] = "runtime: signal received on thread not created by Go.\n"; |
| 354 | |
| 355 | // This runs on a foreign stack, without an m or a g. No stack split. |
| 356 | #pragma textflag NOSPLIT |
| 357 | void |
| 358 | runtime·badsignal2(void) |
| 359 | { |
| 360 | runtime·pwrite(2, badsignal, sizeof badsignal - 1, -1LL); |
| 361 | runtime·exits(badsignal); |
| 362 | } |