github.com/comwrg/go/src@v0.0.0-20220319063731-c238d0440370/runtime/sys_netbsd_arm.s (about) 1 // Copyright 2013 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 // System calls and other sys.stuff for ARM, NetBSD 6 // /usr/src/sys/kern/syscalls.master for syscall numbers. 7 // 8 9 #include "go_asm.h" 10 #include "go_tls.h" 11 #include "textflag.h" 12 13 #define CLOCK_REALTIME 0 14 #define CLOCK_MONOTONIC 3 15 #define FD_CLOEXEC 1 16 #define F_SETFD 2 17 18 #define SWI_OS_NETBSD 0xa00000 19 #define SYS_exit SWI_OS_NETBSD | 1 20 #define SYS_read SWI_OS_NETBSD | 3 21 #define SYS_write SWI_OS_NETBSD | 4 22 #define SYS_open SWI_OS_NETBSD | 5 23 #define SYS_close SWI_OS_NETBSD | 6 24 #define SYS_getpid SWI_OS_NETBSD | 20 25 #define SYS_kill SWI_OS_NETBSD | 37 26 #define SYS_munmap SWI_OS_NETBSD | 73 27 #define SYS_madvise SWI_OS_NETBSD | 75 28 #define SYS_fcntl SWI_OS_NETBSD | 92 29 #define SYS_mmap SWI_OS_NETBSD | 197 30 #define SYS___sysctl SWI_OS_NETBSD | 202 31 #define SYS___sigaltstack14 SWI_OS_NETBSD | 281 32 #define SYS___sigprocmask14 SWI_OS_NETBSD | 293 33 #define SYS_getcontext SWI_OS_NETBSD | 307 34 #define SYS_setcontext SWI_OS_NETBSD | 308 35 #define SYS__lwp_create SWI_OS_NETBSD | 309 36 #define SYS__lwp_exit SWI_OS_NETBSD | 310 37 #define SYS__lwp_self SWI_OS_NETBSD | 311 38 #define SYS__lwp_getprivate SWI_OS_NETBSD | 316 39 #define SYS__lwp_setprivate SWI_OS_NETBSD | 317 40 #define SYS__lwp_kill SWI_OS_NETBSD | 318 41 #define SYS__lwp_unpark SWI_OS_NETBSD | 321 42 #define SYS___sigaction_sigtramp SWI_OS_NETBSD | 340 43 #define SYS_kqueue SWI_OS_NETBSD | 344 44 #define SYS_sched_yield SWI_OS_NETBSD | 350 45 #define SYS___setitimer50 SWI_OS_NETBSD | 425 46 #define SYS___clock_gettime50 SWI_OS_NETBSD | 427 47 #define SYS___nanosleep50 SWI_OS_NETBSD | 430 48 #define SYS___kevent50 SWI_OS_NETBSD | 435 49 #define SYS____lwp_park60 SWI_OS_NETBSD | 478 50 51 // Exit the entire program (like C exit) 52 TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0 53 MOVW code+0(FP), R0 // arg 1 exit status 54 SWI $SYS_exit 55 MOVW.CS $0, R8 // crash on syscall failure 56 MOVW.CS R8, (R8) 57 RET 58 59 // func exitThread(wait *uint32) 60 TEXT runtime·exitThread(SB),NOSPLIT,$0-4 61 MOVW wait+0(FP), R0 62 // We're done using the stack. 63 MOVW $0, R2 64 storeloop: 65 LDREX (R0), R4 // loads R4 66 STREX R2, (R0), R1 // stores R2 67 CMP $0, R1 68 BNE storeloop 69 SWI $SYS__lwp_exit 70 MOVW $1, R8 // crash 71 MOVW R8, (R8) 72 JMP 0(PC) 73 74 TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0 75 MOVW name+0(FP), R0 76 MOVW mode+4(FP), R1 77 MOVW perm+8(FP), R2 78 SWI $SYS_open 79 MOVW.CS $-1, R0 80 MOVW R0, ret+12(FP) 81 RET 82 83 TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0 84 MOVW fd+0(FP), R0 85 SWI $SYS_close 86 MOVW.CS $-1, R0 87 MOVW R0, ret+4(FP) 88 RET 89 90 TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0 91 MOVW fd+0(FP), R0 92 MOVW p+4(FP), R1 93 MOVW n+8(FP), R2 94 SWI $SYS_read 95 RSB.CS $0, R0 // caller expects negative errno 96 MOVW R0, ret+12(FP) 97 RET 98 99 // func pipe() (r, w int32, errno int32) 100 TEXT runtime·pipe(SB),NOSPLIT,$0-12 101 SWI $0xa0002a 102 BCC pipeok 103 MOVW $-1,R2 104 MOVW R2, r+0(FP) 105 MOVW R2, w+4(FP) 106 MOVW R0, errno+8(FP) 107 RET 108 pipeok: 109 MOVW $0, R2 110 MOVW R0, r+0(FP) 111 MOVW R1, w+4(FP) 112 MOVW R2, errno+8(FP) 113 RET 114 115 // func pipe2(flags int32) (r, w int32, errno int32) 116 TEXT runtime·pipe2(SB),NOSPLIT,$0-16 117 MOVW $r+4(FP), R0 118 MOVW flags+0(FP), R1 119 SWI $0xa001c5 120 MOVW R0, errno+12(FP) 121 RET 122 123 TEXT runtime·write1(SB),NOSPLIT|NOFRAME,$0 124 MOVW fd+0(FP), R0 // arg 1 - fd 125 MOVW p+4(FP), R1 // arg 2 - buf 126 MOVW n+8(FP), R2 // arg 3 - nbyte 127 SWI $SYS_write 128 RSB.CS $0, R0 // caller expects negative errno 129 MOVW R0, ret+12(FP) 130 RET 131 132 // int32 lwp_create(void *context, uintptr flags, void *lwpid) 133 TEXT runtime·lwp_create(SB),NOSPLIT,$0 134 MOVW ctxt+0(FP), R0 135 MOVW flags+4(FP), R1 136 MOVW lwpid+8(FP), R2 137 SWI $SYS__lwp_create 138 MOVW R0, ret+12(FP) 139 RET 140 141 TEXT runtime·osyield(SB),NOSPLIT,$0 142 SWI $SYS_sched_yield 143 RET 144 145 TEXT runtime·lwp_park(SB),NOSPLIT,$8 146 MOVW clockid+0(FP), R0 // arg 1 - clock_id 147 MOVW flags+4(FP), R1 // arg 2 - flags 148 MOVW ts+8(FP), R2 // arg 3 - ts 149 MOVW unpark+12(FP), R3 // arg 4 - unpark 150 MOVW hint+16(FP), R4 // arg 5 - hint 151 MOVW R4, 4(R13) 152 MOVW unparkhint+20(FP), R5 // arg 6 - unparkhint 153 MOVW R5, 8(R13) 154 SWI $SYS____lwp_park60 155 MOVW R0, ret+24(FP) 156 RET 157 158 TEXT runtime·lwp_unpark(SB),NOSPLIT,$0 159 MOVW lwp+0(FP), R0 // arg 1 - lwp 160 MOVW hint+4(FP), R1 // arg 2 - hint 161 SWI $SYS__lwp_unpark 162 MOVW R0, ret+8(FP) 163 RET 164 165 TEXT runtime·lwp_self(SB),NOSPLIT,$0 166 SWI $SYS__lwp_self 167 MOVW R0, ret+0(FP) 168 RET 169 170 TEXT runtime·lwp_tramp(SB),NOSPLIT,$0 171 MOVW R0, g_m(R1) 172 MOVW R1, g 173 174 BL runtime·emptyfunc(SB) // fault if stack check is wrong 175 BL (R2) 176 MOVW $2, R8 // crash (not reached) 177 MOVW R8, (R8) 178 RET 179 180 TEXT ·netbsdMstart(SB),NOSPLIT|TOPFRAME,$0 181 BL ·netbsdMstart0(SB) 182 RET // not reached 183 184 TEXT runtime·usleep(SB),NOSPLIT,$16 185 MOVW usec+0(FP), R0 186 CALL runtime·usplitR0(SB) 187 // 0(R13) is the saved LR, don't use it 188 MOVW R0, 4(R13) // tv_sec.low 189 MOVW $0, R0 190 MOVW R0, 8(R13) // tv_sec.high 191 MOVW $1000, R2 192 MUL R1, R2 193 MOVW R2, 12(R13) // tv_nsec 194 195 MOVW $4(R13), R0 // arg 1 - rqtp 196 MOVW $0, R1 // arg 2 - rmtp 197 SWI $SYS___nanosleep50 198 RET 199 200 TEXT runtime·lwp_kill(SB),NOSPLIT,$0-8 201 MOVW tid+0(FP), R0 // arg 1 - tid 202 MOVW sig+4(FP), R1 // arg 2 - signal 203 SWI $SYS__lwp_kill 204 RET 205 206 TEXT runtime·raiseproc(SB),NOSPLIT,$16 207 SWI $SYS_getpid // the returned R0 is arg 1 208 MOVW sig+0(FP), R1 // arg 2 - signal 209 SWI $SYS_kill 210 RET 211 212 TEXT runtime·setitimer(SB),NOSPLIT|NOFRAME,$0 213 MOVW mode+0(FP), R0 // arg 1 - which 214 MOVW new+4(FP), R1 // arg 2 - itv 215 MOVW old+8(FP), R2 // arg 3 - oitv 216 SWI $SYS___setitimer50 217 RET 218 219 // func walltime() (sec int64, nsec int32) 220 TEXT runtime·walltime(SB), NOSPLIT, $32 221 MOVW $0, R0 // CLOCK_REALTIME 222 MOVW $8(R13), R1 223 SWI $SYS___clock_gettime50 224 225 MOVW 8(R13), R0 // sec.low 226 MOVW 12(R13), R1 // sec.high 227 MOVW 16(R13), R2 // nsec 228 229 MOVW R0, sec_lo+0(FP) 230 MOVW R1, sec_hi+4(FP) 231 MOVW R2, nsec+8(FP) 232 RET 233 234 // int64 nanotime1(void) so really 235 // void nanotime1(int64 *nsec) 236 TEXT runtime·nanotime1(SB), NOSPLIT, $32 237 MOVW $3, R0 // CLOCK_MONOTONIC 238 MOVW $8(R13), R1 239 SWI $SYS___clock_gettime50 240 241 MOVW 8(R13), R0 // sec.low 242 MOVW 12(R13), R4 // sec.high 243 MOVW 16(R13), R2 // nsec 244 245 MOVW $1000000000, R3 246 MULLU R0, R3, (R1, R0) 247 MUL R3, R4 248 ADD.S R2, R0 249 ADC R4, R1 250 251 MOVW R0, ret_lo+0(FP) 252 MOVW R1, ret_hi+4(FP) 253 RET 254 255 TEXT runtime·getcontext(SB),NOSPLIT|NOFRAME,$0 256 MOVW ctxt+0(FP), R0 // arg 1 - context 257 SWI $SYS_getcontext 258 MOVW.CS $0, R8 // crash on syscall failure 259 MOVW.CS R8, (R8) 260 RET 261 262 TEXT runtime·sigprocmask(SB),NOSPLIT,$0 263 MOVW how+0(FP), R0 // arg 1 - how 264 MOVW new+4(FP), R1 // arg 2 - set 265 MOVW old+8(FP), R2 // arg 3 - oset 266 SWI $SYS___sigprocmask14 267 MOVW.CS $0, R8 // crash on syscall failure 268 MOVW.CS R8, (R8) 269 RET 270 271 TEXT sigreturn_tramp<>(SB),NOSPLIT|NOFRAME,$0 272 // on entry, SP points to siginfo, we add sizeof(ucontext) 273 // to SP to get a pointer to ucontext. 274 ADD $0x80, R13, R0 // 0x80 == sizeof(UcontextT) 275 SWI $SYS_setcontext 276 // something failed, we have to exit 277 MOVW $0x4242, R0 // magic return number 278 SWI $SYS_exit 279 B -2(PC) // continue exit 280 281 TEXT runtime·sigaction(SB),NOSPLIT,$4 282 MOVW sig+0(FP), R0 // arg 1 - signum 283 MOVW new+4(FP), R1 // arg 2 - nsa 284 MOVW old+8(FP), R2 // arg 3 - osa 285 MOVW $sigreturn_tramp<>(SB), R3 // arg 4 - tramp 286 MOVW $2, R4 // arg 5 - vers 287 MOVW R4, 4(R13) 288 ADD $4, R13 // pass arg 5 on stack 289 SWI $SYS___sigaction_sigtramp 290 SUB $4, R13 291 MOVW.CS $3, R8 // crash on syscall failure 292 MOVW.CS R8, (R8) 293 RET 294 295 TEXT runtime·sigfwd(SB),NOSPLIT,$0-16 296 MOVW sig+4(FP), R0 297 MOVW info+8(FP), R1 298 MOVW ctx+12(FP), R2 299 MOVW fn+0(FP), R11 300 MOVW R13, R4 301 SUB $24, R13 302 BIC $0x7, R13 // alignment for ELF ABI 303 BL (R11) 304 MOVW R4, R13 305 RET 306 307 TEXT runtime·sigtramp(SB),NOSPLIT,$0 308 // Reserve space for callee-save registers and arguments. 309 MOVM.DB.W [R4-R11], (R13) 310 SUB $16, R13 311 312 // this might be called in external code context, 313 // where g is not set. 314 // first save R0, because runtime·load_g will clobber it 315 MOVW R0, 4(R13) // signum 316 MOVB runtime·iscgo(SB), R0 317 CMP $0, R0 318 BL.NE runtime·load_g(SB) 319 320 MOVW R1, 8(R13) 321 MOVW R2, 12(R13) 322 BL runtime·sigtrampgo(SB) 323 324 // Restore callee-save registers. 325 ADD $16, R13 326 MOVM.IA.W (R13), [R4-R11] 327 328 RET 329 330 TEXT runtime·mmap(SB),NOSPLIT,$12 331 MOVW addr+0(FP), R0 // arg 1 - addr 332 MOVW n+4(FP), R1 // arg 2 - len 333 MOVW prot+8(FP), R2 // arg 3 - prot 334 MOVW flags+12(FP), R3 // arg 4 - flags 335 // arg 5 (fid) and arg6 (offset_lo, offset_hi) are passed on stack 336 // note the C runtime only passes the 32-bit offset_lo to us 337 MOVW fd+16(FP), R4 // arg 5 338 MOVW R4, 4(R13) 339 MOVW off+20(FP), R5 // arg 6 lower 32-bit 340 MOVW R5, 8(R13) 341 MOVW $0, R6 // higher 32-bit for arg 6 342 MOVW R6, 12(R13) 343 ADD $4, R13 // pass arg 5 and arg 6 on stack 344 SWI $SYS_mmap 345 SUB $4, R13 346 MOVW $0, R1 347 MOVW.CS R0, R1 // if error, move to R1 348 MOVW.CS $0, R0 349 MOVW R0, p+24(FP) 350 MOVW R1, err+28(FP) 351 RET 352 353 TEXT runtime·munmap(SB),NOSPLIT,$0 354 MOVW addr+0(FP), R0 // arg 1 - addr 355 MOVW n+4(FP), R1 // arg 2 - len 356 SWI $SYS_munmap 357 MOVW.CS $0, R8 // crash on syscall failure 358 MOVW.CS R8, (R8) 359 RET 360 361 TEXT runtime·madvise(SB),NOSPLIT,$0 362 MOVW addr+0(FP), R0 // arg 1 - addr 363 MOVW n+4(FP), R1 // arg 2 - len 364 MOVW flags+8(FP), R2 // arg 3 - behav 365 SWI $SYS_madvise 366 MOVW.CS $-1, R0 367 MOVW R0, ret+12(FP) 368 RET 369 370 TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0 371 MOVW new+0(FP), R0 // arg 1 - nss 372 MOVW old+4(FP), R1 // arg 2 - oss 373 SWI $SYS___sigaltstack14 374 MOVW.CS $0, R8 // crash on syscall failure 375 MOVW.CS R8, (R8) 376 RET 377 378 TEXT runtime·sysctl(SB),NOSPLIT,$8 379 MOVW mib+0(FP), R0 // arg 1 - name 380 MOVW miblen+4(FP), R1 // arg 2 - namelen 381 MOVW out+8(FP), R2 // arg 3 - oldp 382 MOVW size+12(FP), R3 // arg 4 - oldlenp 383 MOVW dst+16(FP), R4 // arg 5 - newp 384 MOVW R4, 4(R13) 385 MOVW ndst+20(FP), R4 // arg 6 - newlen 386 MOVW R4, 8(R13) 387 ADD $4, R13 // pass arg 5 and 6 on stack 388 SWI $SYS___sysctl 389 SUB $4, R13 390 MOVW R0, ret+24(FP) 391 RET 392 393 // int32 runtime·kqueue(void) 394 TEXT runtime·kqueue(SB),NOSPLIT,$0 395 SWI $SYS_kqueue 396 RSB.CS $0, R0 397 MOVW R0, ret+0(FP) 398 RET 399 400 // int32 runtime·kevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout) 401 TEXT runtime·kevent(SB),NOSPLIT,$8 402 MOVW kq+0(FP), R0 // kq 403 MOVW ch+4(FP), R1 // changelist 404 MOVW nch+8(FP), R2 // nchanges 405 MOVW ev+12(FP), R3 // eventlist 406 MOVW nev+16(FP), R4 // nevents 407 MOVW R4, 4(R13) 408 MOVW ts+20(FP), R4 // timeout 409 MOVW R4, 8(R13) 410 ADD $4, R13 // pass arg 5 and 6 on stack 411 SWI $SYS___kevent50 412 RSB.CS $0, R0 413 SUB $4, R13 414 MOVW R0, ret+24(FP) 415 RET 416 417 // void runtime·closeonexec(int32 fd) 418 TEXT runtime·closeonexec(SB),NOSPLIT,$0 419 MOVW fd+0(FP), R0 // fd 420 MOVW $F_SETFD, R1 // F_SETFD 421 MOVW $FD_CLOEXEC, R2 // FD_CLOEXEC 422 SWI $SYS_fcntl 423 RET 424 425 // func runtime·setNonblock(fd int32) 426 TEXT runtime·setNonblock(SB),NOSPLIT,$0-4 427 MOVW fd+0(FP), R0 // fd 428 MOVW $3, R1 // F_GETFL 429 MOVW $0, R2 430 SWI $0xa0005c // sys_fcntl 431 ORR $0x4, R0, R2 // O_NONBLOCK 432 MOVW fd+0(FP), R0 // fd 433 MOVW $4, R1 // F_SETFL 434 SWI $0xa0005c // sys_fcntl 435 RET 436 437 // TODO: this is only valid for ARMv7+ 438 TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0 439 B runtime·armPublicationBarrier(SB) 440 441 TEXT runtime·read_tls_fallback(SB),NOSPLIT|NOFRAME,$0 442 MOVM.WP [R1, R2, R3, R12], (R13) 443 SWI $SYS__lwp_getprivate 444 MOVM.IAW (R13), [R1, R2, R3, R12] 445 RET