// 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 "zasm_GOOS_GOARCH.h"
#include "../../cmd/ld/textflag.h"
// Exit the entire program (like C exit)
TEXT runtime·exit(SB),NOSPLIT,$-4
MOVW 0(FP), R0 // arg 1 exit status
SWI $0xa00001
MOVW.CS $0, R8 // crash on syscall failure
MOVW.CS R8, (R8)
RET
TEXT runtime·exit1(SB),NOSPLIT,$-4
SWI $0xa00136 // sys__lwp_exit
MOVW $1, R8 // crash
MOVW R8, (R8)
RET
TEXT runtime·open(SB),NOSPLIT,$-8
MOVW 0(FP), R0
MOVW 4(FP), R1
MOVW 8(FP), R2
SWI $0xa00005
RET
TEXT runtime·close(SB),NOSPLIT,$-8
MOVW 0(FP), R0
SWI $0xa00006
RET
TEXT runtime·read(SB),NOSPLIT,$-8
MOVW 0(FP), R0
MOVW 4(FP), R1
MOVW 8(FP), R2
SWI $0xa00003
RET
TEXT runtime·write(SB),NOSPLIT,$-4
MOVW 0(FP), R0 // arg 1 - fd
MOVW 4(FP), R1 // arg 2 - buf
MOVW 8(FP), R2 // arg 3 - nbyte
SWI $0xa00004 // sys_write
RET
// int32 lwp_create(void *context, uintptr flags, void *lwpid)
TEXT runtime·lwp_create(SB),NOSPLIT,$0
MOVW context+0(FP), R0
MOVW flags+4(FP), R1
MOVW lwpid+8(FP), R2
SWI $0xa00135 // sys__lwp_create
RET
TEXT runtime·osyield(SB),NOSPLIT,$0
SWI $0xa0015e // sys_sched_yield
RET
TEXT runtime·lwp_park(SB),NOSPLIT,$0
MOVW 0(FP), R0 // arg 1 - abstime
MOVW 4(FP), R1 // arg 2 - unpark
MOVW 8(FP), R2 // arg 3 - hint
MOVW 12(FP), R3 // arg 4 - unparkhint
SWI $0xa001b2 // sys__lwp_park
RET
TEXT runtime·lwp_unpark(SB),NOSPLIT,$0
MOVW 0(FP), R0 // arg 1 - lwp
MOVW 4(FP), R1 // arg 2 - hint
SWI $0xa00141 // sys__lwp_unpark
RET
TEXT runtime·lwp_self(SB),NOSPLIT,$0
SWI $0xa00137 // sys__lwp_self
RET
TEXT runtime·lwp_tramp(SB),NOSPLIT,$0
MOVW R0, m
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 runtime·usleep(SB),NOSPLIT,$16
MOVW usec+0(FP), R0
MOVW R0, R2
MOVW $1000000, R1
DIV R1, R0
// 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
MOD R1, R2
MOVW $1000, R1
MUL R1, R2
MOVW R2, 12(R13) // tv_nsec
MOVW $4(R13), R0 // arg 1 - rqtp
MOVW $0, R1 // arg 2 - rmtp
SWI $0xa001ae // sys_nanosleep
RET
TEXT runtime·raise(SB),NOSPLIT,$16
SWI $0xa00137 // sys__lwp_self, the returned R0 is arg 1
MOVW sig+0(FP), R1 // arg 2 - signal
SWI $0xa0013e // sys__lwp_kill
RET
TEXT runtime·setitimer(SB),NOSPLIT,$-4
MOVW 0(FP), R0 // arg 1 - which
MOVW 4(FP), R1 // arg 2 - itv
MOVW 8(FP), R2 // arg 3 - oitv
SWI $0xa001a9 // sys_setitimer
RET
// func now() (sec int64, nsec int32)
TEXT time·now(SB), NOSPLIT, $32
MOVW $0, R0 // CLOCK_REALTIME
MOVW $8(R13), R1
SWI $0xa001ab // clock_gettime
MOVW 8(R13), R0 // sec.low
MOVW 12(R13), R1 // sec.high
MOVW 16(R13), R2 // nsec
MOVW R0, 0(FP)
MOVW R1, 4(FP)
MOVW R2, 8(FP)
RET
// int64 nanotime(void) so really
// void nanotime(int64 *nsec)
TEXT runtime·nanotime(SB), NOSPLIT, $32
MOVW $0, R0 // CLOCK_REALTIME
MOVW $8(R13), R1
SWI $0xa001ab // clock_gettime
MOVW 8(R13), R0 // sec.low
MOVW 12(R13), R4 // sec.high
MOVW 16(R13), R2 // nsec
MOVW $1000000000, R3
MULLU R0, R3, (R1, R0)
MUL R3, R4
ADD.S R2, R0
ADC R4, R1
MOVW 0(FP), R3
MOVW R0, 0(R3)
MOVW R1, 4(R3)
RET
TEXT runtime·getcontext(SB),NOSPLIT,$-4
MOVW 0(FP), R0 // arg 1 - context
SWI $0xa00133 // sys_getcontext
MOVW.CS $0, R8 // crash on syscall failure
MOVW.CS R8, (R8)
RET
TEXT runtime·sigprocmask(SB),NOSPLIT,$0
MOVW 0(FP), R0 // arg 1 - how
MOVW 4(FP), R1 // arg 2 - set
MOVW 8(FP), R2 // arg 3 - oset
SWI $0xa00125 // sys_sigprocmask
MOVW.CS $0, R8 // crash on syscall failure
MOVW.CS R8, (R8)
RET
TEXT runtime·sigreturn_tramp(SB),NOSPLIT,$-4
// 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 $0xa00134 // sys_setcontext
// something failed, we have to exit
MOVW $0x4242, R0 // magic return number
SWI $0xa00001 // sys_exit
B -2(PC) // continue exit
TEXT runtime·sigaction(SB),NOSPLIT,$4
MOVW 0(FP), R0 // arg 1 - signum
MOVW 4(FP), R1 // arg 2 - nsa
MOVW 8(FP), R2 // arg 3 - osa
MOVW $runtime·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 $0xa00154 // sys___sigaction_sigtramp
SUB $4, R13
MOVW.CS $3, R8 // crash on syscall failure
MOVW.CS R8, (R8)
RET
TEXT runtime·sigtramp(SB),NOSPLIT,$24
// this might be called in external code context,
// where g and m are not set.
// first save R0, because runtime·load_gm will clobber it
MOVW R0, 4(R13) // signum
MOVB runtime·iscgo(SB), R0
CMP $0, R0
BL.NE runtime·load_gm(SB)
CMP $0, m
BNE 4(PC)
// signal number is already prepared in 4(R13)
MOVW $runtime·badsignal(SB), R11
BL (R11)
RET
// save g
MOVW g, R4
MOVW g, 20(R13)
// g = m->signal
MOVW m_gsignal(m), g
// R0 is already saved
MOVW R1, 8(R13) // info
MOVW R2, 12(R13) // context
MOVW R4, 16(R13) // gp
BL runtime·sighandler(SB)
// restore g
MOVW 20(R13), g
RET
TEXT runtime·mmap(SB),NOSPLIT,$12
MOVW 0(FP), R0 // arg 1 - addr
MOVW 4(FP), R1 // arg 2 - len
MOVW 8(FP), R2 // arg 3 - prot
MOVW 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 16(FP), R4 // arg 5
MOVW R4, 4(R13)
MOVW 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 $0xa000c5 // sys_mmap
SUB $4, R13
RET
TEXT runtime·munmap(SB),NOSPLIT,$0
MOVW 0(FP), R0 // arg 1 - addr
MOVW 4(FP), R1 // arg 2 - len
SWI $0xa00049 // sys_munmap
MOVW.CS $0, R8 // crash on syscall failure
MOVW.CS R8, (R8)
RET
TEXT runtime·madvise(SB),NOSPLIT,$0
MOVW 0(FP), R0 // arg 1 - addr
MOVW 4(FP), R1 // arg 2 - len
MOVW 8(FP), R2 // arg 3 - behav
SWI $0xa0004b // sys_madvise
// ignore failure - maybe pages are locked
RET
TEXT runtime·sigaltstack(SB),NOSPLIT,$-4
MOVW 0(FP), R0 // arg 1 - nss
MOVW 4(FP), R1 // arg 2 - oss
SWI $0xa00119 // sys___sigaltstack14
MOVW.CS $0, R8 // crash on syscall failure
MOVW.CS R8, (R8)
RET
TEXT runtime·sysctl(SB),NOSPLIT,$8
MOVW 0(FP), R0 // arg 1 - name
MOVW 4(FP), R1 // arg 2 - namelen
MOVW 8(FP), R2 // arg 3 - oldp
MOVW 12(FP), R3 // arg 4 - oldlenp
MOVW 16(FP), R4 // arg 5 - newp
MOVW R4, 4(R13)
MOVW 20(FP), R4 // arg 6 - newlen
MOVW R4, 8(R13)
ADD $4, R13 // pass arg 5 and 6 on stack
SWI $0xa000ca // sys___sysctl
SUB $4, R13
RET
// int32 runtime·kqueue(void)
TEXT runtime·kqueue(SB),NOSPLIT,$0
SWI $0xa00158 // sys_kqueue
RSB.CS $0, R0
RET
// int32 runtime·kevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout)
TEXT runtime·kevent(SB),NOSPLIT,$8
MOVW 0(FP), R0 // kq
MOVW 4(FP), R1 // changelist
MOVW 8(FP), R2 // nchanges
MOVW 12(FP), R3 // eventlist
MOVW 16(FP), R4 // nevents
MOVW R4, 4(R13)
MOVW 20(FP), R4 // timeout
MOVW R4, 8(R13)
ADD $4, R13 // pass arg 5 and 6 on stack
SWI $0xa001b3 // sys___kevent50
RSB.CS $0, R0
SUB $4, R13
RET
// void runtime·closeonexec(int32 fd)
TEXT runtime·closeonexec(SB),NOSPLIT,$0
MOVW 0(FP), R0 // fd
MOVW $2, R1 // F_SETFD
MOVW $1, R2 // FD_CLOEXEC
SWI $0xa0005c // sys_fcntl
RET
TEXT runtime·casp(SB),NOSPLIT,$0
B runtime·cas(SB)
// TODO(minux): this is only valid for ARMv6+
// bool armcas(int32 *val, int32 old, int32 new)
// Atomically:
// if(*val == old){
// *val = new;
// return 1;
// }else
// return 0;
TEXT runtime·cas(SB),NOSPLIT,$0
B runtime·armcas(SB)
TEXT runtime·read_tls_fallback(SB),NOSPLIT,$-4
MOVM.WP [R1, R2, R3, R12], (R13)
SWI $0x00a0013c // _lwp_getprivate
MOVM.IAW (R13), [R1, R2, R3, R12]
RET