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// 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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