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// Copyright 2009 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, 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
// With OpenBSD 6.7 onwards, an armv7 syscall returns two instructions
// after the SWI instruction, to allow for a speculative execution
// barrier to be placed after the SWI without impacting performance.
// For now use hardware no-ops as this works with both older and newer
// kernels. After OpenBSD 6.8 is released this should be changed to
// speculation barriers.
#define NOOP MOVW R0, R0
#define INVOKE_SYSCALL \
SWI $0; \
NOOP; \
NOOP
// Exit the entire program (like C exit)
TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0
MOVW code+0(FP), R0 // arg 1 - status
MOVW $1, R12 // sys_exit
INVOKE_SYSCALL
MOVW.CS $0, R8 // crash on syscall failure
MOVW.CS R8, (R8)
RET
// func exitThread(wait *uint32)
TEXT runtime·exitThread(SB),NOSPLIT,$0-4
MOVW wait+0(FP), R0 // arg 1 - notdead
MOVW $302, R12 // sys___threxit
INVOKE_SYSCALL
MOVW.CS $1, R8 // crash on syscall failure
MOVW.CS R8, (R8)
JMP 0(PC)
TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0
MOVW name+0(FP), R0 // arg 1 - path
MOVW mode+4(FP), R1 // arg 2 - mode
MOVW perm+8(FP), R2 // arg 3 - perm
MOVW $5, R12 // sys_open
INVOKE_SYSCALL
MOVW.CS $-1, R0
MOVW R0, ret+12(FP)
RET
TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0
MOVW fd+0(FP), R0 // arg 1 - fd
MOVW $6, R12 // sys_close
INVOKE_SYSCALL
MOVW.CS $-1, R0
MOVW R0, ret+4(FP)
RET
TEXT runtime·read(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
MOVW $3, R12 // sys_read
INVOKE_SYSCALL
RSB.CS $0, R0 // caller expects negative errno
MOVW R0, ret+12(FP)
RET
// func pipe() (r, w int32, errno int32)
TEXT runtime·pipe(SB),NOSPLIT,$0-12
MOVW $r+0(FP), R0
MOVW $263, R12
INVOKE_SYSCALL
MOVW R0, errno+8(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
MOVW $101, R12
INVOKE_SYSCALL
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
MOVW $4, R12 // sys_write
INVOKE_SYSCALL
RSB.CS $0, R0 // caller expects negative errno
MOVW R0, ret+12(FP)
RET
TEXT runtime·usleep(SB),NOSPLIT,$16
MOVW usec+0(FP), R0
CALL runtime·usplitR0(SB)
MOVW R0, 4(R13) // tv_sec - l32
MOVW $0, R0
MOVW R0, 8(R13) // tv_sec - h32
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
MOVW $91, R12 // sys_nanosleep
INVOKE_SYSCALL
RET
TEXT runtime·getthrid(SB),NOSPLIT,$0-4
MOVW $299, R12 // sys_getthrid
INVOKE_SYSCALL
MOVW R0, ret+0(FP)
RET
TEXT runtime·thrkill(SB),NOSPLIT,$0-8
MOVW tid+0(FP), R0 // arg 1 - tid
MOVW sig+4(FP), R1 // arg 2 - signum
MOVW $0, R2 // arg 3 - tcb
MOVW $119, R12 // sys_thrkill
INVOKE_SYSCALL
RET
TEXT runtime·raiseproc(SB),NOSPLIT,$12
MOVW $20, R12 // sys_getpid
INVOKE_SYSCALL
// arg 1 - pid, already in R0
MOVW sig+0(FP), R1 // arg 2 - signum
MOVW $122, R12 // sys_kill
INVOKE_SYSCALL
RET
TEXT runtime·mmap(SB),NOSPLIT,$16
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
MOVW fd+16(FP), R4 // arg 5 - fd (on stack)
MOVW R4, 4(R13)
MOVW $0, R5 // arg 6 - pad (on stack)
MOVW R5, 8(R13)
MOVW off+20(FP), R6 // arg 7 - offset (on stack)
MOVW R6, 12(R13) // lower 32 bits (from Go runtime)
MOVW $0, R7
MOVW R7, 16(R13) // high 32 bits
ADD $4, R13
MOVW $197, R12 // sys_mmap
INVOKE_SYSCALL
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
MOVW $73, R12 // sys_munmap
INVOKE_SYSCALL
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 2 - flags
MOVW $75, R12 // sys_madvise
INVOKE_SYSCALL
MOVW.CS $-1, R0
MOVW R0, ret+12(FP)
RET
TEXT runtime·setitimer(SB),NOSPLIT,$0
MOVW mode+0(FP), R0 // arg 1 - mode
MOVW new+4(FP), R1 // arg 2 - new value
MOVW old+8(FP), R2 // arg 3 - old value
MOVW $69, R12 // sys_setitimer
INVOKE_SYSCALL
RET
// func walltime1() (sec int64, nsec int32)
TEXT runtime·walltime1(SB), NOSPLIT, $32
MOVW CLOCK_REALTIME, R0 // arg 1 - clock_id
MOVW $8(R13), R1 // arg 2 - tp
MOVW $87, R12 // sys_clock_gettime
INVOKE_SYSCALL
MOVW 8(R13), R0 // sec - l32
MOVW 12(R13), R1 // sec - h32
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 CLOCK_MONOTONIC, R0 // arg 1 - clock_id
MOVW $8(R13), R1 // arg 2 - tp
MOVW $87, R12 // sys_clock_gettime
INVOKE_SYSCALL
MOVW 8(R13), R0 // sec - l32
MOVW 12(R13), R4 // sec - h32
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·sigaction(SB),NOSPLIT,$0
MOVW sig+0(FP), R0 // arg 1 - signum
MOVW new+4(FP), R1 // arg 2 - new sigaction
MOVW old+8(FP), R2 // arg 3 - old sigaction
MOVW $46, R12 // sys_sigaction
INVOKE_SYSCALL
MOVW.CS $3, R8 // crash on syscall failure
MOVW.CS R8, (R8)
RET
TEXT runtime·obsdsigprocmask(SB),NOSPLIT,$0
MOVW how+0(FP), R0 // arg 1 - mode
MOVW new+4(FP), R1 // arg 2 - new
MOVW $48, R12 // sys_sigprocmask
INVOKE_SYSCALL
MOVW.CS $3, R8 // crash on syscall failure
MOVW.CS R8, (R8)
MOVW R0, ret+8(FP)
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,$0
// Reserve space for callee-save registers and arguments.
MOVM.DB.W [R4-R11], (R13)
SUB $16, R13
// If called from an external code context, g will not be set.
// Save R0, since 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
// 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.
MOVW mm+8(FP), R4
MOVW gg+12(FP), R5
MOVW fn+16(FP), R6
MOVW param+0(FP), R0 // arg 1 - param
MOVW psize+4(FP), R1 // arg 2 - psize
MOVW $8, R12 // sys___tfork
INVOKE_SYSCALL
// Return if syscall failed.
B.CC 4(PC)
RSB $0, R0
MOVW R0, ret+20(FP)
RET
// In parent, return.
CMP $0, R0
BEQ 3(PC)
MOVW R0, ret+20(FP)
RET
// Initialise m, g.
MOVW R5, g
MOVW R4, g_m(g)
// Paranoia; check that stack splitting code works.
BL runtime·emptyfunc(SB)
// Call fn.
BL (R6)
// fn should never return.
MOVW $2, R8 // crash if reached
MOVW R8, (R8)
RET
TEXT runtime·sigaltstack(SB),NOSPLIT,$0
MOVW new+0(FP), R0 // arg 1 - new sigaltstack
MOVW old+4(FP), R1 // arg 2 - old sigaltstack
MOVW $288, R12 // sys_sigaltstack
INVOKE_SYSCALL
MOVW.CS $0, R8 // crash on syscall failure
MOVW.CS R8, (R8)
RET
TEXT runtime·osyield(SB),NOSPLIT,$0
MOVW $298, R12 // sys_sched_yield
INVOKE_SYSCALL
RET
TEXT runtime·thrsleep(SB),NOSPLIT,$4
MOVW ident+0(FP), R0 // arg 1 - ident
MOVW clock_id+4(FP), R1 // arg 2 - clock_id
MOVW tsp+8(FP), R2 // arg 3 - tsp
MOVW lock+12(FP), R3 // arg 4 - lock
MOVW abort+16(FP), R4 // arg 5 - abort (on stack)
MOVW R4, 4(R13)
ADD $4, R13
MOVW $94, R12 // sys___thrsleep
INVOKE_SYSCALL
SUB $4, R13
MOVW R0, ret+20(FP)
RET
TEXT runtime·thrwakeup(SB),NOSPLIT,$0
MOVW ident+0(FP), R0 // arg 1 - ident
MOVW n+4(FP), R1 // arg 2 - n
MOVW $301, R12 // sys___thrwakeup
INVOKE_SYSCALL
MOVW R0, ret+8(FP)
RET
TEXT runtime·sysctl(SB),NOSPLIT,$8
MOVW mib+0(FP), R0 // arg 1 - mib
MOVW miblen+4(FP), R1 // arg 2 - miblen
MOVW out+8(FP), R2 // arg 3 - out
MOVW size+12(FP), R3 // arg 4 - size
MOVW dst+16(FP), R4 // arg 5 - dest (on stack)
MOVW R4, 4(R13)
MOVW ndst+20(FP), R5 // arg 6 - newlen (on stack)
MOVW R5, 8(R13)
ADD $4, R13
MOVW $202, R12 // sys___sysctl
INVOKE_SYSCALL
SUB $4, R13
MOVW.CC $0, R0
RSB.CS $0, R0
MOVW R0, ret+24(FP)
RET
// int32 runtime·kqueue(void);
TEXT runtime·kqueue(SB),NOSPLIT,$0
MOVW $269, R12 // sys_kqueue
INVOKE_SYSCALL
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 // arg 1 - kq
MOVW ch+4(FP), R1 // arg 2 - changelist
MOVW nch+8(FP), R2 // arg 3 - nchanges
MOVW ev+12(FP), R3 // arg 4 - eventlist
MOVW nev+16(FP), R4 // arg 5 - nevents (on stack)
MOVW R4, 4(R13)
MOVW ts+20(FP), R5 // arg 6 - timeout (on stack)
MOVW R5, 8(R13)
ADD $4, R13
MOVW $72, R12 // sys_kevent
INVOKE_SYSCALL
RSB.CS $0, R0
SUB $4, R13
MOVW R0, ret+24(FP)
RET
// func closeonexec(fd int32)
TEXT runtime·closeonexec(SB),NOSPLIT,$0
MOVW fd+0(FP), R0 // arg 1 - fd
MOVW $2, R1 // arg 2 - cmd (F_SETFD)
MOVW $1, R2 // arg 3 - arg (FD_CLOEXEC)
MOVW $92, R12 // sys_fcntl
INVOKE_SYSCALL
RET
// func runtime·setNonblock(fd int32)
TEXT runtime·setNonblock(SB),NOSPLIT,$0-4
MOVW fd+0(FP), R0 // fd
MOVW $3, R1 // F_GETFL
MOVW $0, R2
MOVW $92, R12
INVOKE_SYSCALL
ORR $0x4, R0, R2 // O_NONBLOCK
MOVW fd+0(FP), R0 // fd
MOVW $4, R1 // F_SETFL
MOVW $92, R12
INVOKE_SYSCALL
RET
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)
MOVW $330, R12 // sys___get_tcb
INVOKE_SYSCALL
MOVM.IAW (R13), [R1, R2, R3, R12]
RET