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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
// 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·thrkill_trampoline(SB),NOSPLIT,$0
MOVW 8(R0), R1 // arg 2 - signal
MOVD $0, R2 // arg 3 - tcb
MOVW 0(R0), R0 // arg 1 - tid
CALL libc_thrkill(SB)
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·exit_trampoline(SB),NOSPLIT,$0
MOVW 0(R0), R0 // arg 1 - status
CALL libc_exit(SB)
MOVD $0, R0 // crash on failure
MOVD R0, (R0)
RET
TEXT runtime·getthrid_trampoline(SB),NOSPLIT,$0
MOVD R0, R19 // pointer to args
CALL libc_getthrid(SB)
MOVW R0, 0(R19) // return value
RET
TEXT runtime·raiseproc_trampoline(SB),NOSPLIT,$0
MOVD R0, R19 // pointer to args
CALL libc_getpid(SB) // arg 1 - pid
MOVW 0(R19), R1 // arg 2 - signal
CALL libc_kill(SB)
RET
TEXT runtime·sched_yield_trampoline(SB),NOSPLIT,$0
CALL libc_sched_yield(SB)
RET
TEXT runtime·mmap_trampoline(SB),NOSPLIT,$0
MOVD R0, R19 // pointer to args
MOVD 0(R19), R0 // arg 1 - addr
MOVD 8(R19), R1 // arg 2 - len
MOVW 16(R19), R2 // arg 3 - prot
MOVW 20(R19), R3 // arg 4 - flags
MOVW 24(R19), R4 // arg 5 - fid
MOVW 28(R19), R5 // arg 6 - offset
CALL libc_mmap(SB)
MOVD $0, R1
CMP $-1, R0
BNE noerr
CALL libc_errno(SB)
MOVW (R0), R1 // errno
MOVD $0, R0
noerr:
MOVD R0, 32(R19)
MOVD R1, 40(R19)
RET
TEXT runtime·munmap_trampoline(SB),NOSPLIT,$0
MOVD 8(R0), R1 // arg 2 - len
MOVD 0(R0), R0 // arg 1 - addr
CALL libc_munmap(SB)
CMP $-1, R0
BNE 3(PC)
MOVD $0, R0 // crash on failure
MOVD R0, (R0)
RET
TEXT runtime·madvise_trampoline(SB), NOSPLIT, $0
MOVD 8(R0), R1 // arg 2 - len
MOVW 16(R0), R2 // arg 3 - advice
MOVD 0(R0), R0 // arg 1 - addr
CALL libc_madvise(SB)
// ignore failure - maybe pages are locked
RET
TEXT runtime·open_trampoline(SB),NOSPLIT,$0
MOVW 8(R0), R1 // arg 2 - flags
MOVW 12(R0), R2 // arg 3 - mode
MOVD 0(R0), R0 // arg 1 - path
MOVD $0, R3 // varargs
CALL libc_open(SB)
RET
TEXT runtime·close_trampoline(SB),NOSPLIT,$0
MOVD 0(R0), R0 // arg 1 - fd
CALL libc_close(SB)
RET
TEXT runtime·read_trampoline(SB),NOSPLIT,$0
MOVD 8(R0), R1 // arg 2 - buf
MOVW 16(R0), R2 // arg 3 - count
MOVW 0(R0), R0 // arg 1 - fd
CALL libc_read(SB)
CMP $-1, R0
BNE noerr
CALL libc_errno(SB)
MOVW (R0), R0 // errno
NEG R0, R0 // caller expects negative errno value
noerr:
RET
TEXT runtime·write_trampoline(SB),NOSPLIT,$0
MOVD 8(R0), R1 // arg 2 - buf
MOVW 16(R0), R2 // arg 3 - count
MOVW 0(R0), R0 // arg 1 - fd
CALL libc_write(SB)
CMP $-1, R0
BNE noerr
CALL libc_errno(SB)
MOVW (R0), R0 // errno
NEG R0, R0 // caller expects negative errno value
noerr:
RET
TEXT runtime·pipe2_trampoline(SB),NOSPLIT,$0
MOVW 8(R0), R1 // arg 2 - flags
MOVD 0(R0), R0 // arg 1 - filedes
CALL libc_pipe2(SB)
CMP $-1, R0
BNE noerr
CALL libc_errno(SB)
MOVW (R0), R0 // errno
NEG R0, R0 // caller expects negative errno value
noerr:
RET
TEXT runtime·setitimer_trampoline(SB),NOSPLIT,$0
MOVD 8(R0), R1 // arg 2 - new
MOVD 16(R0), R2 // arg 3 - old
MOVW 0(R0), R0 // arg 1 - which
CALL libc_setitimer(SB)
RET
TEXT runtime·usleep_trampoline(SB),NOSPLIT,$0
MOVD 0(R0), R0 // arg 1 - usec
CALL libc_usleep(SB)
RET
TEXT runtime·sysctl_trampoline(SB),NOSPLIT,$0
MOVW 8(R0), R1 // arg 2 - miblen
MOVD 16(R0), R2 // arg 3 - out
MOVD 24(R0), R3 // arg 4 - size
MOVD 32(R0), R4 // arg 5 - dst
MOVD 40(R0), R5 // arg 6 - ndst
MOVD 0(R0), R0 // arg 1 - mib
CALL libc_sysctl(SB)
RET
TEXT runtime·kqueue_trampoline(SB),NOSPLIT,$0
CALL libc_kqueue(SB)
RET
TEXT runtime·kevent_trampoline(SB),NOSPLIT,$0
MOVD 8(R0), R1 // arg 2 - keventt
MOVW 16(R0), R2 // arg 3 - nch
MOVD 24(R0), R3 // arg 4 - ev
MOVW 32(R0), R4 // arg 5 - nev
MOVD 40(R0), R5 // arg 6 - ts
MOVW 0(R0), R0 // arg 1 - kq
CALL libc_kevent(SB)
CMP $-1, R0
BNE noerr
CALL libc_errno(SB)
MOVW (R0), R0 // errno
NEG R0, R0 // caller expects negative errno value
noerr:
RET
TEXT runtime·clock_gettime_trampoline(SB),NOSPLIT,$0
MOVD 8(R0), R1 // arg 2 - tp
MOVD 0(R0), R0 // arg 1 - clock_id
CALL libc_clock_gettime(SB)
CMP $-1, R0
BNE 3(PC)
MOVD $0, R0 // crash on failure
MOVD R0, (R0)
RET
TEXT runtime·fcntl_trampoline(SB),NOSPLIT,$0
MOVW 4(R0), R1 // arg 2 - cmd
MOVW 8(R0), R2 // arg 3 - arg
MOVW 0(R0), R0 // arg 1 - fd
MOVD $0, R3 // vararg
CALL libc_fcntl(SB)
RET
TEXT runtime·sigaction_trampoline(SB),NOSPLIT,$0
MOVD 8(R0), R1 // arg 2 - new
MOVD 16(R0), R2 // arg 3 - old
MOVW 0(R0), R0 // arg 1 - sig
CALL libc_sigaction(SB)
CMP $-1, R0
BNE 3(PC)
MOVD $0, R0 // crash on syscall failure
MOVD R0, (R0)
RET
TEXT runtime·sigprocmask_trampoline(SB),NOSPLIT,$0
MOVD 8(R0), R1 // arg 2 - new
MOVD 16(R0), R2 // arg 3 - old
MOVW 0(R0), R0 // arg 1 - how
CALL libc_pthread_sigmask(SB)
CMP $-1, R0
BNE 3(PC)
MOVD $0, R0 // crash on syscall failure
MOVD R0, (R0)
RET
TEXT runtime·sigaltstack_trampoline(SB),NOSPLIT,$0
MOVD 8(R0), R1 // arg 2 - old
MOVD 0(R0), R0 // arg 1 - new
CALL libc_sigaltstack(SB)
CMP $-1, R0
BNE 3(PC)
MOVD $0, R0 // crash on syscall failure
MOVD R0, (R0)
RET
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