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// 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
// System calls are implemented in libc/libpthread, this file
// contains trampolines that convert from Go to C calling convention.
// Some direct system call implementations currently remain.
//
#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 arm64 syscall returns two instructions
// after the SVC instruction, to allow for a speculative execution
// barrier to be placed after the SVC 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 INVOKE_SYSCALL \
SVC; \
NOOP; \
NOOP
// mstart_stub is the first function executed on a new thread started by pthread_create.
// It just does some low-level setup and then calls mstart.
// Note: called with the C calling convention.
TEXT runtime·mstart_stub(SB),NOSPLIT,$160
// R0 points to the m.
// We are already on m's g0 stack.
// Save callee-save registers.
MOVD R19, 8(RSP)
MOVD R20, 16(RSP)
MOVD R21, 24(RSP)
MOVD R22, 32(RSP)
MOVD R23, 40(RSP)
MOVD R24, 48(RSP)
MOVD R25, 56(RSP)
MOVD R26, 64(RSP)
MOVD R27, 72(RSP)
MOVD g, 80(RSP)
MOVD R29, 88(RSP)
FMOVD F8, 96(RSP)
FMOVD F9, 104(RSP)
FMOVD F10, 112(RSP)
FMOVD F11, 120(RSP)
FMOVD F12, 128(RSP)
FMOVD F13, 136(RSP)
FMOVD F14, 144(RSP)
FMOVD F15, 152(RSP)
MOVD m_g0(R0), g
BL runtime·save_g(SB)
BL runtime·mstart(SB)
// Restore callee-save registers.
MOVD 8(RSP), R19
MOVD 16(RSP), R20
MOVD 24(RSP), R21
MOVD 32(RSP), R22
MOVD 40(RSP), R23
MOVD 48(RSP), R24
MOVD 56(RSP), R25
MOVD 64(RSP), R26
MOVD 72(RSP), R27
MOVD 80(RSP), g
MOVD 88(RSP), R29
FMOVD 96(RSP), F8
FMOVD 104(RSP), F9
FMOVD 112(RSP), F10
FMOVD 120(RSP), F11
FMOVD 128(RSP), F12
FMOVD 136(RSP), F13
FMOVD 144(RSP), F14
FMOVD 152(RSP), F15
// Go is all done with this OS thread.
// Tell pthread everything is ok (we never join with this thread, so
// the value here doesn't really matter).
MOVD $0, R0
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
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
//
// These trampolines help convert from Go calling convention to C calling convention.
// They should be called with asmcgocall.
// A pointer to the arguments is passed in R0.
// A single int32 result is returned in R0.
// (For more results, make an args/results structure.)
TEXT runtime·pthread_attr_init_trampoline(SB),NOSPLIT,$0
MOVD 0(R0), R0 // arg 1 - attr
CALL libc_pthread_attr_init(SB)
RET
TEXT runtime·pthread_attr_destroy_trampoline(SB),NOSPLIT,$0
MOVD 0(R0), R0 // arg 1 - attr
CALL libc_pthread_attr_destroy(SB)
RET
TEXT runtime·pthread_attr_getstacksize_trampoline(SB),NOSPLIT,$0
MOVD 8(R0), R1 // arg 2 - size
MOVD 0(R0), R0 // arg 1 - attr
CALL libc_pthread_attr_getstacksize(SB)
RET
TEXT runtime·pthread_attr_setdetachstate_trampoline(SB),NOSPLIT,$0
MOVD 8(R0), R1 // arg 2 - state
MOVD 0(R0), R0 // arg 1 - attr
CALL libc_pthread_attr_setdetachstate(SB)
RET
TEXT runtime·pthread_create_trampoline(SB),NOSPLIT,$0
MOVD 0(R0), R1 // arg 2 - attr
MOVD 8(R0), R2 // arg 3 - start
MOVD 16(R0), R3 // arg 4 - arg
SUB $16, RSP
MOVD RSP, R0 // arg 1 - &threadid (discard)
CALL libc_pthread_create(SB)
ADD $16, RSP
RET
TEXT runtime·thrsleep_trampoline(SB),NOSPLIT,$0
MOVW 8(R0), R1 // arg 2 - clock_id
MOVD 16(R0), R2 // arg 3 - abstime
MOVD 24(R0), R3 // arg 4 - lock
MOVD 32(R0), R4 // arg 5 - abort
MOVD 0(R0), R0 // arg 1 - id
CALL libc_thrsleep(SB)
RET
TEXT runtime·thrwakeup_trampoline(SB),NOSPLIT,$0
MOVW 8(R0), R1 // arg 2 - count
MOVD 0(R0), R0 // arg 1 - id
CALL libc_thrwakeup(SB)
RET
TEXT runtime·sched_yield_trampoline(SB),NOSPLIT,$0
CALL libc_sched_yield(SB)
RET
// 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
INVOKE_SYSCALL
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
INVOKE_SYSCALL
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
INVOKE_SYSCALL
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
INVOKE_SYSCALL
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
INVOKE_SYSCALL
BCC 2(PC)
NEG R0, R0
MOVW R0, ret+24(FP)
RET
// func pipe() (r, w int32, errno int32)
TEXT runtime·pipe(SB),NOSPLIT|NOFRAME,$0-12
MOVD $r+0(FP), R0
MOVW $0, R1
MOVD $101, R8 // sys_pipe2
INVOKE_SYSCALL
BCC 2(PC)
NEG R0, R0
MOVW R0, errno+8(FP)
RET
// func pipe2(flags int32) (r, w int32, errno int32)
TEXT runtime·pipe2(SB),NOSPLIT|NOFRAME,$0-20
MOVD $r+8(FP), R0
MOVW flags+0(FP), R1
MOVD $101, R8 // sys_pipe2
INVOKE_SYSCALL
BCC 2(PC)
NEG R0, R0
MOVW R0, errno+16(FP)
RET
TEXT runtime·write1(SB),NOSPLIT|NOFRAME,$0
MOVD 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
INVOKE_SYSCALL
BCC 2(PC)
NEG R0, 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
INVOKE_SYSCALL
RET
TEXT runtime·getthrid(SB),NOSPLIT,$0-4
MOVD $299, R8 // sys_getthrid
INVOKE_SYSCALL
MOVW R0, ret+0(FP)
RET
TEXT runtime·thrkill(SB),NOSPLIT,$0-16
MOVW tid+0(FP), R0 // arg 1 - tid
MOVD sig+8(FP), R1 // arg 2 - signum
MOVW $0, R2 // arg 3 - tcb
MOVD $119, R8 // sys_thrkill
INVOKE_SYSCALL
RET
TEXT runtime·raiseproc(SB),NOSPLIT,$0
MOVD $20, R8 // sys_getpid
INVOKE_SYSCALL
// arg 1 - pid, already in R0
MOVW sig+0(FP), R1 // arg 2 - signum
MOVD $122, R8 // sys_kill
INVOKE_SYSCALL
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
INVOKE_SYSCALL
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
INVOKE_SYSCALL
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
INVOKE_SYSCALL
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
INVOKE_SYSCALL
RET
// func walltime1() (sec int64, nsec int32)
TEXT runtime·walltime1(SB), NOSPLIT, $32
MOVW CLOCK_REALTIME, R0 // arg 1 - clock_id
MOVD $8(RSP), R1 // arg 2 - tp
MOVD $87, R8 // sys_clock_gettime
INVOKE_SYSCALL
MOVD 8(RSP), R0 // sec
MOVD 16(RSP), R1 // nsec
MOVD R0, sec+0(FP)
MOVW R1, 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
MOVD $8(RSP), R1 // arg 2 - tp
MOVD $87, R8 // sys_clock_gettime
INVOKE_SYSCALL
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
INVOKE_SYSCALL
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
INVOKE_SYSCALL
BCC 3(PC)
MOVD $3, R8 // crash on syscall failure
MOVD R8, (R8)
MOVW R0, ret+8(FP)
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
INVOKE_SYSCALL
BCC 3(PC)
MOVD $0, R8 // crash on syscall failure
MOVD R8, (R8)
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
INVOKE_SYSCALL
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
INVOKE_SYSCALL
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
INVOKE_SYSCALL
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
INVOKE_SYSCALL
RET
// func runtime·setNonblock(int32 fd)
TEXT runtime·setNonblock(SB),NOSPLIT|NOFRAME,$0-4
MOVW fd+0(FP), R0 // arg 1 - fd
MOVD $3, R1 // arg 2 - cmd (F_GETFL)
MOVD $0, R2 // arg 3
MOVD $92, R8 // sys_fcntl
INVOKE_SYSCALL
MOVD $4, R2 // O_NONBLOCK
ORR R0, R2 // arg 3 - flags
MOVW fd+0(FP), R0 // arg 1 - fd
MOVD $4, R1 // arg 2 - cmd (F_SETFL)
MOVD $92, R8 // sys_fcntl
INVOKE_SYSCALL
RET
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