// Copyright 2019 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 arm64, OpenBSD
// /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
// Exit the entire program (like C exit)
TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0
MOVW code+0(FP), R0 // arg 1 - status
MOVD $1, R8 // sys_exit
SVC
BCC 3(PC)
MOVD $0, R0 // crash on syscall failure
MOVD R0, (R0)
RET
// func exitThread(wait *uint32)
TEXT runtime·exitThread(SB),NOSPLIT,$0
MOVD wait+0(FP), R0 // arg 1 - notdead
MOVD $302, R8 // sys___threxit
SVC
MOVD $0, R0 // crash on syscall failure
MOVD R0, (R0)
JMP 0(PC)
TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0
MOVD name+0(FP), R0 // arg 1 - path
MOVW mode+8(FP), R1 // arg 2 - mode
MOVW perm+12(FP), R2 // arg 3 - perm
MOVD $5, R8 // sys_open
SVC
BCC 2(PC)
MOVW $-1, R0
MOVW R0, ret+16(FP)
RET
TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0
MOVW fd+0(FP), R0 // arg 1 - fd
MOVD $6, R8 // sys_close
SVC
BCC 2(PC)
MOVW $-1, R0
MOVW R0, ret+8(FP)
RET
TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0
MOVW fd+0(FP), R0 // arg 1 - fd
MOVD p+8(FP), R1 // arg 2 - buf
MOVW n+16(FP), R2 // arg 3 - nbyte
MOVD $3, R8 // sys_read
SVC
BCC 2(PC)
MOVW $-1, R0
MOVW R0, ret+24(FP)
RET
TEXT runtime·write(SB),NOSPLIT|NOFRAME,$0
MOVW fd+0(FP), R0 // arg 1 - fd
MOVD p+8(FP), R1 // arg 2 - buf
MOVW n+16(FP), R2 // arg 3 - nbyte
MOVD $4, R8 // sys_write
SVC
BCC 2(PC)
MOVW $-1, R0
MOVW R0, ret+24(FP)
RET
TEXT runtime·usleep(SB),NOSPLIT,$24-4
MOVWU usec+0(FP), R3
MOVD R3, R5
MOVW $1000000, R4
UDIV R4, R3
MOVD R3, 8(RSP) // tv_sec
MUL R3, R4
SUB R4, R5
MOVW $1000, R4
MUL R4, R5
MOVD R5, 16(RSP) // tv_nsec
ADD $8, RSP, R0 // arg 1 - rqtp
MOVD $0, R1 // arg 2 - rmtp
MOVD $91, R8 // sys_nanosleep
SVC
RET
TEXT runtime·raise(SB),NOSPLIT,$0
MOVD $299, R8 // sys_getthrid
SVC
// arg 1 - tid, already in R0
MOVW sig+0(FP), R1 // arg 2 - signum
MOVW $0, R2 // arg 3 - tcb
MOVD $119, R8 // sys_thrkill
SVC
RET
TEXT runtime·raiseproc(SB),NOSPLIT,$0
MOVD $20, R8 // sys_getpid
SVC
// arg 1 - pid, already in R0
MOVW sig+0(FP), R1 // arg 2 - signum
MOVD $122, R8 // sys_kill
SVC
RET
TEXT runtime·mmap(SB),NOSPLIT,$0
MOVD addr+0(FP), R0 // arg 1 - addr
MOVD n+8(FP), R1 // arg 2 - len
MOVW prot+16(FP), R2 // arg 3 - prot
MOVW flags+20(FP), R3 // arg 4 - flags
MOVW fd+24(FP), R4 // arg 5 - fd
MOVW $0, R5 // arg 6 - pad
MOVW off+28(FP), R6 // arg 7 - offset
MOVD $197, R8 // sys_mmap
SVC
MOVD $0, R1
BCC 3(PC)
MOVD R0, R1 // if error, move to R1
MOVD $0, R0
MOVD R0, p+32(FP)
MOVD R1, err+40(FP)
RET
TEXT runtime·munmap(SB),NOSPLIT,$0
MOVD addr+0(FP), R0 // arg 1 - addr
MOVD n+8(FP), R1 // arg 2 - len
MOVD $73, R8 // sys_munmap
SVC
BCC 3(PC)
MOVD $0, R0 // crash on syscall failure
MOVD R0, (R0)
RET
TEXT runtime·madvise(SB),NOSPLIT,$0
MOVD addr+0(FP), R0 // arg 1 - addr
MOVD n+8(FP), R1 // arg 2 - len
MOVW flags+16(FP), R2 // arg 2 - flags
MOVD $75, R8 // sys_madvise
SVC
BCC 2(PC)
MOVW $-1, R0
MOVW R0, ret+24(FP)
RET
TEXT runtime·setitimer(SB),NOSPLIT,$0
MOVW mode+0(FP), R0 // arg 1 - mode
MOVD new+8(FP), R1 // arg 2 - new value
MOVD old+16(FP), R2 // arg 3 - old value
MOVD $69, R8 // sys_setitimer
SVC
RET
// func walltime() (sec int64, nsec int32)
TEXT runtime·walltime(SB), NOSPLIT, $32
MOVW CLOCK_REALTIME, R0 // arg 1 - clock_id
MOVD $8(RSP), R1 // arg 2 - tp
MOVD $87, R8 // sys_clock_gettime
SVC
MOVD 8(RSP), R0 // sec
MOVD 16(RSP), R1 // nsec
MOVD R0, sec+0(FP)
MOVW R1, nsec+8(FP)
RET
// int64 nanotime(void) so really
// void nanotime(int64 *nsec)
TEXT runtime·nanotime(SB),NOSPLIT,$32
MOVW CLOCK_MONOTONIC, R0 // arg 1 - clock_id
MOVD $8(RSP), R1 // arg 2 - tp
MOVD $87, R8 // sys_clock_gettime
SVC
MOVW 8(RSP), R3 // sec
MOVW 16(RSP), R5 // nsec
MOVD $1000000000, R4
MUL R4, R3
ADD R5, R3
MOVD R3, ret+0(FP)
RET
TEXT runtime·sigaction(SB),NOSPLIT,$0
MOVW sig+0(FP), R0 // arg 1 - signum
MOVD new+8(FP), R1 // arg 2 - new sigaction
MOVD old+16(FP), R2 // arg 3 - old sigaction
MOVD $46, R8 // sys_sigaction
SVC
BCC 3(PC)
MOVD $3, R0 // crash on syscall failure
MOVD R0, (R0)
RET
TEXT runtime·obsdsigprocmask(SB),NOSPLIT,$0
MOVW how+0(FP), R0 // arg 1 - mode
MOVW new+4(FP), R1 // arg 2 - new
MOVD $48, R8 // sys_sigprocmask
SVC
BCC 3(PC)
MOVD $3, R8 // crash on syscall failure
MOVD R8, (R8)
MOVW R0, ret+8(FP)
RET
TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
MOVW sig+8(FP), R0
MOVD info+16(FP), R1
MOVD ctx+24(FP), R2
MOVD fn+0(FP), R11
BL (R11) // Alignment for ELF ABI?
RET
TEXT runtime·sigtramp(SB),NOSPLIT,$192
// Save callee-save registers in the case of signal forwarding.
// Please refer to https://golang.org/issue/31827 .
MOVD R19, 8*4(RSP)
MOVD R20, 8*5(RSP)
MOVD R21, 8*6(RSP)
MOVD R22, 8*7(RSP)
MOVD R23, 8*8(RSP)
MOVD R24, 8*9(RSP)
MOVD R25, 8*10(RSP)
MOVD R26, 8*11(RSP)
MOVD R27, 8*12(RSP)
MOVD g, 8*13(RSP)
MOVD R29, 8*14(RSP)
FMOVD F8, 8*15(RSP)
FMOVD F9, 8*16(RSP)
FMOVD F10, 8*17(RSP)
FMOVD F11, 8*18(RSP)
FMOVD F12, 8*19(RSP)
FMOVD F13, 8*20(RSP)
FMOVD F14, 8*21(RSP)
FMOVD F15, 8*22(RSP)
// If called from an external code context, g will not be set.
// Save R0, since runtime·load_g will clobber it.
MOVW R0, 8(RSP) // signum
MOVB runtime·iscgo(SB), R0
CMP $0, R0
BEQ 2(PC)
BL runtime·load_g(SB)
MOVD R1, 16(RSP)
MOVD R2, 24(RSP)
BL runtime·sigtrampgo(SB)
// Restore callee-save registers.
MOVD 8*4(RSP), R19
MOVD 8*5(RSP), R20
MOVD 8*6(RSP), R21
MOVD 8*7(RSP), R22
MOVD 8*8(RSP), R23
MOVD 8*9(RSP), R24
MOVD 8*10(RSP), R25
MOVD 8*11(RSP), R26
MOVD 8*12(RSP), R27
MOVD 8*13(RSP), g
MOVD 8*14(RSP), R29
FMOVD 8*15(RSP), F8
FMOVD 8*16(RSP), F9
FMOVD 8*17(RSP), F10
FMOVD 8*18(RSP), F11
FMOVD 8*19(RSP), F12
FMOVD 8*20(RSP), F13
FMOVD 8*21(RSP), F14
FMOVD 8*22(RSP), F15
RET
// int32 tfork(void *param, uintptr psize, M *mp, G *gp, void (*fn)(void));
TEXT runtime·tfork(SB),NOSPLIT,$0
// Copy mp, gp and fn off parent stack for use by child.
MOVD mm+16(FP), R4
MOVD gg+24(FP), R5
MOVD fn+32(FP), R6
MOVD param+0(FP), R0 // arg 1 - param
MOVD psize+8(FP), R1 // arg 2 - psize
MOVD $8, R8 // sys___tfork
SVC
// Return if syscall failed.
BCC 4(PC)
NEG R0, R0
MOVW R0, ret+40(FP)
RET
// In parent, return.
CMP $0, R0
BEQ 3(PC)
MOVW R0, ret+40(FP)
RET
// Initialise m, g.
MOVD R5, g
MOVD R4, g_m(g)
// Call fn.
BL (R6)
// fn should never return.
MOVD $2, R8 // crash if reached
MOVD R8, (R8)
RET
TEXT runtime·sigaltstack(SB),NOSPLIT,$0
MOVD new+0(FP), R0 // arg 1 - new sigaltstack
MOVD old+8(FP), R1 // arg 2 - old sigaltstack
MOVD $288, R8 // sys_sigaltstack
SVC
BCC 3(PC)
MOVD $0, R8 // crash on syscall failure
MOVD R8, (R8)
RET
TEXT runtime·osyield(SB),NOSPLIT,$0
MOVD $298, R8 // sys_sched_yield
SVC
RET
TEXT runtime·thrsleep(SB),NOSPLIT,$0
MOVD ident+0(FP), R0 // arg 1 - ident
MOVW clock_id+8(FP), R1 // arg 2 - clock_id
MOVD tsp+16(FP), R2 // arg 3 - tsp
MOVD lock+24(FP), R3 // arg 4 - lock
MOVD abort+32(FP), R4 // arg 5 - abort
MOVD $94, R8 // sys___thrsleep
SVC
MOVW R0, ret+40(FP)
RET
TEXT runtime·thrwakeup(SB),NOSPLIT,$0
MOVD ident+0(FP), R0 // arg 1 - ident
MOVW n+8(FP), R1 // arg 2 - n
MOVD $301, R8 // sys___thrwakeup
SVC
MOVW R0, ret+16(FP)
RET
TEXT runtime·sysctl(SB),NOSPLIT,$0
MOVD mib+0(FP), R0 // arg 1 - mib
MOVW miblen+8(FP), R1 // arg 2 - miblen
MOVD out+16(FP), R2 // arg 3 - out
MOVD size+24(FP), R3 // arg 4 - size
MOVD dst+32(FP), R4 // arg 5 - dest
MOVD ndst+40(FP), R5 // arg 6 - newlen
MOVD $202, R8 // sys___sysctl
SVC
BCC 2(PC)
NEG R0, R0
MOVW R0, ret+48(FP)
RET
// int32 runtime·kqueue(void);
TEXT runtime·kqueue(SB),NOSPLIT,$0
MOVD $269, R8 // sys_kqueue
SVC
BCC 2(PC)
NEG R0, 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,$0
MOVW kq+0(FP), R0 // arg 1 - kq
MOVD ch+8(FP), R1 // arg 2 - changelist
MOVW nch+16(FP), R2 // arg 3 - nchanges
MOVD ev+24(FP), R3 // arg 4 - eventlist
MOVW nev+32(FP), R4 // arg 5 - nevents
MOVD ts+40(FP), R5 // arg 6 - timeout
MOVD $72, R8 // sys_kevent
SVC
BCC 2(PC)
NEG R0, R0
MOVW R0, ret+48(FP)
RET
// func closeonexec(fd int32)
TEXT runtime·closeonexec(SB),NOSPLIT,$0
MOVW fd+0(FP), R0 // arg 1 - fd
MOVD $2, R1 // arg 2 - cmd (F_SETFD)
MOVD $1, R2 // arg 3 - arg (FD_CLOEXEC)
MOVD $92, R8 // sys_fcntl
SVC
RET
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