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sys_netbsd_arm.s
// Copyright 2013 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // // System calls and other sys.stuff for ARM, NetBSD // /usr/src/sys/kern/syscalls.master for syscall numbers. // #include "go_asm.h" #include "go_tls.h" #include "textflag.h" #define CLOCK_REALTIME 0 #define CLOCK_MONOTONIC 3 #define SWI_OS_NETBSD 0xa00000 #define SYS_exit SWI_OS_NETBSD | 1 #define SYS_read SWI_OS_NETBSD | 3 #define SYS_write SWI_OS_NETBSD | 4 #define SYS_open SWI_OS_NETBSD | 5 #define SYS_close SWI_OS_NETBSD | 6 #define SYS_getpid SWI_OS_NETBSD | 20 #define SYS_kill SWI_OS_NETBSD | 37 #define SYS_munmap SWI_OS_NETBSD | 73 #define SYS_madvise SWI_OS_NETBSD | 75 #define SYS_fcntl SWI_OS_NETBSD | 92 #define SYS_mmap SWI_OS_NETBSD | 197 #define SYS___sysctl SWI_OS_NETBSD | 202 #define SYS___sigaltstack14 SWI_OS_NETBSD | 281 #define SYS___sigprocmask14 SWI_OS_NETBSD | 293 #define SYS_issetugid SWI_OS_NETBSD | 305 #define SYS_getcontext SWI_OS_NETBSD | 307 #define SYS_setcontext SWI_OS_NETBSD | 308 #define SYS__lwp_create SWI_OS_NETBSD | 309 #define SYS__lwp_exit SWI_OS_NETBSD | 310 #define SYS__lwp_self SWI_OS_NETBSD | 311 #define SYS__lwp_getprivate SWI_OS_NETBSD | 316 #define SYS__lwp_setprivate SWI_OS_NETBSD | 317 #define SYS__lwp_kill SWI_OS_NETBSD | 318 #define SYS__lwp_unpark SWI_OS_NETBSD | 321 #define SYS___sigaction_sigtramp SWI_OS_NETBSD | 340 #define SYS_kqueue SWI_OS_NETBSD | 344 #define SYS_sched_yield SWI_OS_NETBSD | 350 #define SYS___setitimer50 SWI_OS_NETBSD | 425 #define SYS___clock_gettime50 SWI_OS_NETBSD | 427 #define SYS___nanosleep50 SWI_OS_NETBSD | 430 #define SYS___kevent50 SWI_OS_NETBSD | 435 #define SYS____lwp_park60 SWI_OS_NETBSD | 478 // Exit the entire program (like C exit) TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0 MOVW code+0(FP), R0 // arg 1 exit status SWI $SYS_exit MOVW.CS $0, R8 // crash on syscall failure MOVW.CS R8, (R8) RET // func exitThread(wait *atomic.Uint32) TEXT runtime·exitThread(SB),NOSPLIT,$0-4 MOVW wait+0(FP), R0 // We're done using the stack. MOVW $0, R2 storeloop: LDREX (R0), R4 // loads R4 STREX R2, (R0), R1 // stores R2 CMP $0, R1 BNE storeloop SWI $SYS__lwp_exit MOVW $1, R8 // crash MOVW R8, (R8) JMP 0(PC) TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0 MOVW name+0(FP), R0 MOVW mode+4(FP), R1 MOVW perm+8(FP), R2 SWI $SYS_open MOVW.CS $-1, R0 MOVW R0, ret+12(FP) RET TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0 MOVW fd+0(FP), R0 SWI $SYS_close MOVW.CS $-1, R0 MOVW R0, ret+4(FP) RET TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0 MOVW fd+0(FP), R0 MOVW p+4(FP), R1 MOVW n+8(FP), R2 SWI $SYS_read RSB.CS $0, R0 // caller expects negative errno MOVW R0, ret+12(FP) RET // func pipe2(flags int32) (r, w int32, errno int32) TEXT runtime·pipe2(SB),NOSPLIT,$0-16 MOVW $r+4(FP), R0 MOVW flags+0(FP), R1 SWI $0xa001c5 MOVW R0, errno+12(FP) RET TEXT runtime·write1(SB),NOSPLIT|NOFRAME,$0 MOVW fd+0(FP), R0 // arg 1 - fd MOVW p+4(FP), R1 // arg 2 - buf MOVW n+8(FP), R2 // arg 3 - nbyte SWI $SYS_write RSB.CS $0, R0 // caller expects negative errno MOVW R0, ret+12(FP) RET // int32 lwp_create(void *context, uintptr flags, void *lwpid) TEXT runtime·lwp_create(SB),NOSPLIT,$0 MOVW ctxt+0(FP), R0 MOVW flags+4(FP), R1 MOVW lwpid+8(FP), R2 SWI $SYS__lwp_create MOVW R0, ret+12(FP) RET TEXT runtime·osyield(SB),NOSPLIT,$0 SWI $SYS_sched_yield RET TEXT runtime·lwp_park(SB),NOSPLIT,$8 MOVW clockid+0(FP), R0 // arg 1 - clock_id MOVW flags+4(FP), R1 // arg 2 - flags MOVW ts+8(FP), R2 // arg 3 - ts MOVW unpark+12(FP), R3 // arg 4 - unpark MOVW hint+16(FP), R4 // arg 5 - hint MOVW R4, 4(R13) MOVW unparkhint+20(FP), R5 // arg 6 - unparkhint MOVW R5, 8(R13) SWI $SYS____lwp_park60 MOVW R0, ret+24(FP) RET TEXT runtime·lwp_unpark(SB),NOSPLIT,$0 MOVW lwp+0(FP), R0 // arg 1 - lwp MOVW hint+4(FP), R1 // arg 2 - hint SWI $SYS__lwp_unpark MOVW R0, ret+8(FP) RET TEXT runtime·lwp_self(SB),NOSPLIT,$0 SWI $SYS__lwp_self MOVW R0, ret+0(FP) RET TEXT runtime·lwp_tramp(SB),NOSPLIT,$0 MOVW R0, g_m(R1) MOVW R1, g BL runtime·emptyfunc(SB) // fault if stack check is wrong BL (R2) MOVW $2, R8 // crash (not reached) MOVW R8, (R8) RET TEXT ·netbsdMstart(SB),NOSPLIT|TOPFRAME,$0 BL ·netbsdMstart0(SB) RET // not reached TEXT runtime·usleep(SB),NOSPLIT,$16 MOVW usec+0(FP), R0 CALL runtime·usplitR0(SB) // 0(R13) is the saved LR, don't use it MOVW R0, 4(R13) // tv_sec.low MOVW $0, R0 MOVW R0, 8(R13) // tv_sec.high MOVW $1000, R2 MUL R1, R2 MOVW R2, 12(R13) // tv_nsec MOVW $4(R13), R0 // arg 1 - rqtp MOVW $0, R1 // arg 2 - rmtp SWI $SYS___nanosleep50 RET TEXT runtime·lwp_kill(SB),NOSPLIT,$0-8 MOVW tid+0(FP), R0 // arg 1 - tid MOVW sig+4(FP), R1 // arg 2 - signal SWI $SYS__lwp_kill RET TEXT runtime·raiseproc(SB),NOSPLIT,$16 SWI $SYS_getpid // the returned R0 is arg 1 MOVW sig+0(FP), R1 // arg 2 - signal SWI $SYS_kill RET TEXT runtime·setitimer(SB),NOSPLIT|NOFRAME,$0 MOVW mode+0(FP), R0 // arg 1 - which MOVW new+4(FP), R1 // arg 2 - itv MOVW old+8(FP), R2 // arg 3 - oitv SWI $SYS___setitimer50 RET // func walltime() (sec int64, nsec int32) TEXT runtime·walltime(SB), NOSPLIT, $32 MOVW $0, R0 // CLOCK_REALTIME MOVW $8(R13), R1 SWI $SYS___clock_gettime50 MOVW 8(R13), R0 // sec.low MOVW 12(R13), R1 // sec.high MOVW 16(R13), R2 // nsec MOVW R0, sec_lo+0(FP) MOVW R1, sec_hi+4(FP) MOVW R2, nsec+8(FP) RET // int64 nanotime1(void) so really // void nanotime1(int64 *nsec) TEXT runtime·nanotime1(SB), NOSPLIT, $32 MOVW $3, R0 // CLOCK_MONOTONIC MOVW $8(R13), R1 SWI $SYS___clock_gettime50 MOVW 8(R13), R0 // sec.low MOVW 12(R13), R4 // sec.high MOVW 16(R13), R2 // nsec MOVW $1000000000, R3 MULLU R0, R3, (R1, R0) MUL R3, R4 ADD.S R2, R0 ADC R4, R1 MOVW R0, ret_lo+0(FP) MOVW R1, ret_hi+4(FP) RET TEXT runtime·getcontext(SB),NOSPLIT|NOFRAME,$0 MOVW ctxt+0(FP), R0 // arg 1 - context SWI $SYS_getcontext MOVW.CS $0, R8 // crash on syscall failure MOVW.CS R8, (R8) RET TEXT runtime·sigprocmask(SB),NOSPLIT,$0 MOVW how+0(FP), R0 // arg 1 - how MOVW new+4(FP), R1 // arg 2 - set MOVW old+8(FP), R2 // arg 3 - oset SWI $SYS___sigprocmask14 MOVW.CS $0, R8 // crash on syscall failure MOVW.CS R8, (R8) RET TEXT sigreturn_tramp<>(SB),NOSPLIT|NOFRAME,$0 // on entry, SP points to siginfo, we add sizeof(ucontext) // to SP to get a pointer to ucontext. ADD $0x80, R13, R0 // 0x80 == sizeof(UcontextT) SWI $SYS_setcontext // something failed, we have to exit MOVW $0x4242, R0 // magic return number SWI $SYS_exit B -2(PC) // continue exit TEXT runtime·sigaction(SB),NOSPLIT,$4 MOVW sig+0(FP), R0 // arg 1 - signum MOVW new+4(FP), R1 // arg 2 - nsa MOVW old+8(FP), R2 // arg 3 - osa MOVW $sigreturn_tramp<>(SB), R3 // arg 4 - tramp MOVW $2, R4 // arg 5 - vers MOVW R4, 4(R13) ADD $4, R13 // pass arg 5 on stack SWI $SYS___sigaction_sigtramp SUB $4, R13 MOVW.CS $3, R8 // crash on syscall failure MOVW.CS R8, (R8) RET TEXT runtime·sigfwd(SB),NOSPLIT,$0-16 MOVW sig+4(FP), R0 MOVW info+8(FP), R1 MOVW ctx+12(FP), R2 MOVW fn+0(FP), R11 MOVW R13, R4 SUB $24, R13 BIC $0x7, R13 // alignment for ELF ABI BL (R11) MOVW R4, R13 RET TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$0 // Reserve space for callee-save registers and arguments. MOVM.DB.W [R4-R11], (R13) SUB $16, R13 // this might be called in external code context, // where g is not set. // first save R0, because runtime·load_g will clobber it MOVW R0, 4(R13) // signum MOVB runtime·iscgo(SB), R0 CMP $0, R0 BL.NE runtime·load_g(SB) MOVW R1, 8(R13) MOVW R2, 12(R13) BL runtime·sigtrampgo(SB) // Restore callee-save registers. ADD $16, R13 MOVM.IA.W (R13), [R4-R11] RET TEXT runtime·mmap(SB),NOSPLIT,$12 MOVW addr+0(FP), R0 // arg 1 - addr MOVW n+4(FP), R1 // arg 2 - len MOVW prot+8(FP), R2 // arg 3 - prot MOVW flags+12(FP), R3 // arg 4 - flags // arg 5 (fid) and arg6 (offset_lo, offset_hi) are passed on stack // note the C runtime only passes the 32-bit offset_lo to us MOVW fd+16(FP), R4 // arg 5 MOVW R4, 4(R13) MOVW off+20(FP), R5 // arg 6 lower 32-bit MOVW R5, 8(R13) MOVW $0, R6 // higher 32-bit for arg 6 MOVW R6, 12(R13) ADD $4, R13 // pass arg 5 and arg 6 on stack SWI $SYS_mmap SUB $4, R13 MOVW $0, R1 MOVW.CS R0, R1 // if error, move to R1 MOVW.CS $0, R0 MOVW R0, p+24(FP) MOVW R1, err+28(FP) RET TEXT runtime·munmap(SB),NOSPLIT,$0 MOVW addr+0(FP), R0 // arg 1 - addr MOVW n+4(FP), R1 // arg 2 - len SWI $SYS_munmap MOVW.CS $0, R8 // crash on syscall failure MOVW.CS R8, (R8) RET TEXT runtime·madvise(SB),NOSPLIT,$0 MOVW addr+0(FP), R0 // arg 1 - addr MOVW n+4(FP), R1 // arg 2 - len MOVW flags+8(FP), R2 // arg 3 - behav SWI $SYS_madvise MOVW.CS $-1, R0 MOVW R0, ret+12(FP) RET TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0 MOVW new+0(FP), R0 // arg 1 - nss MOVW old+4(FP), R1 // arg 2 - oss SWI $SYS___sigaltstack14 MOVW.CS $0, R8 // crash on syscall failure MOVW.CS R8, (R8) RET TEXT runtime·sysctl(SB),NOSPLIT,$8 MOVW mib+0(FP), R0 // arg 1 - name MOVW miblen+4(FP), R1 // arg 2 - namelen MOVW out+8(FP), R2 // arg 3 - oldp MOVW size+12(FP), R3 // arg 4 - oldlenp MOVW dst+16(FP), R4 // arg 5 - newp MOVW R4, 4(R13) MOVW ndst+20(FP), R4 // arg 6 - newlen MOVW R4, 8(R13) ADD $4, R13 // pass arg 5 and 6 on stack SWI $SYS___sysctl SUB $4, R13 MOVW R0, ret+24(FP) RET // int32 runtime·kqueue(void) TEXT runtime·kqueue(SB),NOSPLIT,$0 SWI $SYS_kqueue RSB.CS $0, R0 MOVW R0, ret+0(FP) RET // int32 runtime·kevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout) TEXT runtime·kevent(SB),NOSPLIT,$8 MOVW kq+0(FP), R0 // kq MOVW ch+4(FP), R1 // changelist MOVW nch+8(FP), R2 // nchanges MOVW ev+12(FP), R3 // eventlist MOVW nev+16(FP), R4 // nevents MOVW R4, 4(R13) MOVW ts+20(FP), R4 // timeout MOVW R4, 8(R13) ADD $4, R13 // pass arg 5 and 6 on stack SWI $SYS___kevent50 RSB.CS $0, R0 SUB $4, R13 MOVW R0, ret+24(FP) RET // func fcntl(fd, cmd, args int32) int32 TEXT runtime·fcntl(SB),NOSPLIT,$0 MOVW fd+0(FP), R0 MOVW cmd+4(FP), R1 MOVW arg+8(FP), R2 SWI $SYS_fcntl MOVW $0, R1 MOVW.CS R0, R1 MOVW.CS $-1, R0 MOVW R0, ret+12(FP) MOVW R1, errno+16(FP) RET // TODO: this is only valid for ARMv7+ TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0 B runtime·armPublicationBarrier(SB) TEXT runtime·read_tls_fallback(SB),NOSPLIT|NOFRAME,$0 MOVM.WP [R1, R2, R3, R12], (R13) SWI $SYS__lwp_getprivate MOVM.IAW (R13), [R1, R2, R3, R12] RET // func issetugid() int32 TEXT runtime·issetugid(SB),NOSPLIT,$0 SWI $SYS_issetugid MOVW R0, ret+0(FP) RET
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