// 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 AMD64, NetBSD
// /usr/src/sys/kern/syscalls.master for syscall numbers.
//

#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"
#include "cgo/abi_amd64.h"

#define CLOCK_REALTIME		0
#define CLOCK_MONOTONIC		3

#define SYS_exit			1
#define SYS_read			3
#define SYS_write			4
#define SYS_open			5
#define SYS_close			6
#define SYS_getpid			20
#define SYS_kill			37
#define SYS_munmap			73
#define SYS_madvise			75
#define SYS_fcntl			92
#define SYS_mmap			197
#define SYS___sysctl			202
#define SYS___sigaltstack14		281
#define SYS___sigprocmask14		293
#define SYS_getcontext			307
#define SYS_setcontext			308
#define SYS__lwp_create			309
#define SYS__lwp_exit			310
#define SYS__lwp_self			311
#define SYS__lwp_setprivate		317
#define SYS__lwp_kill			318
#define SYS__lwp_unpark			321
#define SYS___sigaction_sigtramp	340
#define SYS_kqueue			344
#define SYS_sched_yield			350
#define SYS___setitimer50		425
#define SYS___clock_gettime50		427
#define SYS___nanosleep50		430
#define SYS___kevent50			435
#define SYS____lwp_park60		478

// int32 lwp_create(void *context, uintptr flags, void *lwpid)
TEXT runtime·lwp_create(SB),NOSPLIT,$0
	MOVQ	ctxt+0(FP), DI
	MOVQ	flags+8(FP), SI
	MOVQ	lwpid+16(FP), DX
	MOVL	$SYS__lwp_create, AX
	SYSCALL
	JCC	2(PC)
	NEGQ	AX
	MOVL	AX, ret+24(FP)
	RET

TEXT runtime·lwp_tramp(SB),NOSPLIT,$0

	// Set FS to point at m->tls.
	LEAQ	m_tls(R8), DI
	CALL	runtime·settls(SB)

	// Set up new stack.
	get_tls(CX)
	MOVQ	R8, g_m(R9)
	MOVQ	R9, g(CX)
	CALL	runtime·stackcheck(SB)

	// Call fn. This is an ABI0 PC.
	CALL	R12

	// It shouldn't return. If it does, exit.
	MOVL	$SYS__lwp_exit, AX
	SYSCALL
	JMP	-3(PC)			// keep exiting

TEXT ·netbsdMstart(SB),NOSPLIT|TOPFRAME,$0
	CALL	·netbsdMstart0(SB)
	RET // not reached

TEXT runtime·osyield(SB),NOSPLIT,$0
	MOVL	$SYS_sched_yield, AX
	SYSCALL
	RET

TEXT runtime·lwp_park(SB),NOSPLIT,$0
	MOVL	clockid+0(FP), DI		// arg 1 - clockid
	MOVL	flags+4(FP), SI			// arg 2 - flags
	MOVQ	ts+8(FP), DX			// arg 3 - ts
	MOVL	unpark+16(FP), R10		// arg 4 - unpark
	MOVQ	hint+24(FP), R8			// arg 5 - hint
	MOVQ	unparkhint+32(FP), R9		// arg 6 - unparkhint
	MOVL	$SYS____lwp_park60, AX
	SYSCALL
	MOVL	AX, ret+40(FP)
	RET

TEXT runtime·lwp_unpark(SB),NOSPLIT,$0
	MOVL	lwp+0(FP), DI		// arg 1 - lwp
	MOVQ	hint+8(FP), SI		// arg 2 - hint
	MOVL	$SYS__lwp_unpark, AX
	SYSCALL
	MOVL	AX, ret+16(FP)
	RET

TEXT runtime·lwp_self(SB),NOSPLIT,$0
	MOVL	$SYS__lwp_self, AX
	SYSCALL
	MOVL	AX, ret+0(FP)
	RET

// Exit the entire program (like C exit)
TEXT runtime·exit(SB),NOSPLIT,$-8
	MOVL	code+0(FP), DI		// arg 1 - exit status
	MOVL	$SYS_exit, AX
	SYSCALL
	MOVL	$0xf1, 0xf1		// crash
	RET

// func exitThread(wait *atomic.Uint32)
TEXT runtime·exitThread(SB),NOSPLIT,$0-8
	MOVQ	wait+0(FP), AX
	// We're done using the stack.
	MOVL	$0, (AX)
	MOVL	$SYS__lwp_exit, AX
	SYSCALL
	MOVL	$0xf1, 0xf1		// crash
	JMP	0(PC)

TEXT runtime·open(SB),NOSPLIT,$-8
	MOVQ	name+0(FP), DI		// arg 1 pathname
	MOVL	mode+8(FP), SI		// arg 2 flags
	MOVL	perm+12(FP), DX		// arg 3 mode
	MOVL	$SYS_open, AX
	SYSCALL
	JCC	2(PC)
	MOVL	$-1, AX
	MOVL	AX, ret+16(FP)
	RET

TEXT runtime·closefd(SB),NOSPLIT,$-8
	MOVL	fd+0(FP), DI		// arg 1 fd
	MOVL	$SYS_close, AX
	SYSCALL
	JCC	2(PC)
	MOVL	$-1, AX
	MOVL	AX, ret+8(FP)
	RET

TEXT runtime·read(SB),NOSPLIT,$-8
	MOVL	fd+0(FP), DI		// arg 1 fd
	MOVQ	p+8(FP), SI		// arg 2 buf
	MOVL	n+16(FP), DX		// arg 3 count
	MOVL	$SYS_read, AX
	SYSCALL
	JCC	2(PC)
	NEGQ	AX			// caller expects negative errno
	MOVL	AX, ret+24(FP)
	RET

// func pipe2(flags int32) (r, w int32, errno int32)
TEXT runtime·pipe2(SB),NOSPLIT,$0-20
	LEAQ	r+8(FP), DI
	MOVL	flags+0(FP), SI
	MOVL	$453, AX
	SYSCALL
	MOVL	AX, errno+16(FP)
	RET

TEXT runtime·write1(SB),NOSPLIT,$-8
	MOVQ	fd+0(FP), DI		// arg 1 - fd
	MOVQ	p+8(FP), SI		// arg 2 - buf
	MOVL	n+16(FP), DX		// arg 3 - nbyte
	MOVL	$SYS_write, AX
	SYSCALL
	JCC	2(PC)
	NEGQ	AX			// caller expects negative errno
	MOVL	AX, ret+24(FP)
	RET

TEXT runtime·usleep(SB),NOSPLIT,$16
	MOVL	$0, DX
	MOVL	usec+0(FP), AX
	MOVL	$1000000, CX
	DIVL	CX
	MOVQ	AX, 0(SP)		// tv_sec
	MOVL	$1000, AX
	MULL	DX
	MOVQ	AX, 8(SP)		// tv_nsec

	MOVQ	SP, DI			// arg 1 - rqtp
	MOVQ	$0, SI			// arg 2 - rmtp
	MOVL	$SYS___nanosleep50, AX
	SYSCALL
	RET

TEXT runtime·lwp_kill(SB),NOSPLIT,$0-16
	MOVL	tid+0(FP), DI		// arg 1 - target
	MOVQ	sig+8(FP), SI		// arg 2 - signo
	MOVL	$SYS__lwp_kill, AX
	SYSCALL
	RET

TEXT runtime·raiseproc(SB),NOSPLIT,$16
	MOVL	$SYS_getpid, AX
	SYSCALL
	MOVQ	AX, DI			// arg 1 - pid
	MOVL	sig+0(FP), SI		// arg 2 - signo
	MOVL	$SYS_kill, AX
	SYSCALL
	RET

TEXT runtime·setitimer(SB),NOSPLIT,$-8
	MOVL	mode+0(FP), DI		// arg 1 - which
	MOVQ	new+8(FP), SI		// arg 2 - itv
	MOVQ	old+16(FP), DX		// arg 3 - oitv
	MOVL	$SYS___setitimer50, AX
	SYSCALL
	RET

// func walltime() (sec int64, nsec int32)
TEXT runtime·walltime(SB), NOSPLIT, $32
	MOVQ	$CLOCK_REALTIME, DI	// arg 1 - clock_id
	LEAQ	8(SP), SI		// arg 2 - tp
	MOVL	$SYS___clock_gettime50, AX
	SYSCALL
	MOVQ	8(SP), AX		// sec
	MOVQ	16(SP), DX		// nsec

	// sec is in AX, nsec in DX
	MOVQ	AX, sec+0(FP)
	MOVL	DX, nsec+8(FP)
	RET

TEXT runtime·nanotime1(SB),NOSPLIT,$32
	MOVQ	$CLOCK_MONOTONIC, DI	// arg 1 - clock_id
	LEAQ	8(SP), SI		// arg 2 - tp
	MOVL	$SYS___clock_gettime50, AX
	SYSCALL
	MOVQ	8(SP), AX		// sec
	MOVQ	16(SP), DX		// nsec

	// sec is in AX, nsec in DX
	// return nsec in AX
	IMULQ	$1000000000, AX
	ADDQ	DX, AX
	MOVQ	AX, ret+0(FP)
	RET

TEXT runtime·getcontext(SB),NOSPLIT,$-8
	MOVQ	ctxt+0(FP), DI		// arg 1 - context
	MOVL	$SYS_getcontext, AX
	SYSCALL
	JCC	2(PC)
	MOVL	$0xf1, 0xf1		// crash
	RET

TEXT runtime·sigprocmask(SB),NOSPLIT,$0
	MOVL	how+0(FP), DI		// arg 1 - how
	MOVQ	new+8(FP), SI		// arg 2 - set
	MOVQ	old+16(FP), DX		// arg 3 - oset
	MOVL	$SYS___sigprocmask14, AX
	SYSCALL
	JCC	2(PC)
	MOVL	$0xf1, 0xf1		// crash
	RET

TEXT sigreturn_tramp<>(SB),NOSPLIT,$-8
	MOVQ	R15, DI			// Load address of ucontext
	MOVQ	$SYS_setcontext, AX
	SYSCALL
	MOVQ	$-1, DI			// Something failed...
	MOVL	$SYS_exit, AX
	SYSCALL

TEXT runtime·sigaction(SB),NOSPLIT,$-8
	MOVL	sig+0(FP), DI		// arg 1 - signum
	MOVQ	new+8(FP), SI		// arg 2 - nsa
	MOVQ	old+16(FP), DX		// arg 3 - osa
					// arg 4 - tramp
	LEAQ	sigreturn_tramp<>(SB), R10
	MOVQ	$2, R8			// arg 5 - vers
	MOVL	$SYS___sigaction_sigtramp, AX
	SYSCALL
	JCC	2(PC)
	MOVL	$0xf1, 0xf1		// crash
	RET

TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
	MOVQ	fn+0(FP),    AX
	MOVL	sig+8(FP),   DI
	MOVQ	info+16(FP), SI
	MOVQ	ctx+24(FP),  DX
	MOVQ	SP, BX		// callee-saved
	ANDQ	$~15, SP	// alignment for x86_64 ABI
	CALL	AX
	MOVQ	BX, SP
	RET

// Called using C ABI.
TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME|NOFRAME,$0
	// Transition from C ABI to Go ABI.
	PUSH_REGS_HOST_TO_ABI0()

	// Set up ABIInternal environment: g in R14, cleared X15.
	get_tls(R12)
	MOVQ	g(R12), R14
	PXOR	X15, X15

	// Reserve space for spill slots.
	NOP	SP		// disable vet stack checking
	ADJSP   $24

	// Call into the Go signal handler
	MOVQ	DI, AX	// sig
	MOVQ	SI, BX	// info
	MOVQ	DX, CX	// ctx
	CALL	·sigtrampgo<ABIInternal>(SB)

	ADJSP	$-24

	POP_REGS_HOST_TO_ABI0()
	RET

TEXT runtime·mmap(SB),NOSPLIT,$0
	MOVQ	addr+0(FP), DI		// arg 1 - addr
	MOVQ	n+8(FP), SI		// arg 2 - len
	MOVL	prot+16(FP), DX		// arg 3 - prot
	MOVL	flags+20(FP), R10		// arg 4 - flags
	MOVL	fd+24(FP), R8		// arg 5 - fd
	MOVL	off+28(FP), R9
	SUBQ	$16, SP
	MOVQ	R9, 8(SP)		// arg 7 - offset (passed on stack)
	MOVQ	$0, R9			// arg 6 - pad
	MOVL	$SYS_mmap, AX
	SYSCALL
	JCC	ok
	ADDQ	$16, SP
	MOVQ	$0, p+32(FP)
	MOVQ	AX, err+40(FP)
	RET
ok:
	ADDQ	$16, SP
	MOVQ	AX, p+32(FP)
	MOVQ	$0, err+40(FP)
	RET

TEXT runtime·munmap(SB),NOSPLIT,$0
	MOVQ	addr+0(FP), DI		// arg 1 - addr
	MOVQ	n+8(FP), SI		// arg 2 - len
	MOVL	$SYS_munmap, AX
	SYSCALL
	JCC	2(PC)
	MOVL	$0xf1, 0xf1		// crash
	RET


TEXT runtime·madvise(SB),NOSPLIT,$0
	MOVQ	addr+0(FP), DI		// arg 1 - addr
	MOVQ	n+8(FP), SI		// arg 2 - len
	MOVL	flags+16(FP), DX	// arg 3 - behav
	MOVQ	$SYS_madvise, AX
	SYSCALL
	JCC	2(PC)
	MOVL	$-1, AX
	MOVL	AX, ret+24(FP)
	RET

TEXT runtime·sigaltstack(SB),NOSPLIT,$-8
	MOVQ	new+0(FP), DI		// arg 1 - nss
	MOVQ	old+8(FP), SI		// arg 2 - oss
	MOVQ	$SYS___sigaltstack14, AX
	SYSCALL
	JCC	2(PC)
	MOVL	$0xf1, 0xf1		// crash
	RET

// set tls base to DI
TEXT runtime·settls(SB),NOSPLIT,$8
	// adjust for ELF: wants to use -8(FS) for g
	ADDQ	$8, DI			// arg 1 - ptr
	MOVQ	$SYS__lwp_setprivate, AX
	SYSCALL
	JCC	2(PC)
	MOVL	$0xf1, 0xf1		// crash
	RET

TEXT runtime·sysctl(SB),NOSPLIT,$0
	MOVQ	mib+0(FP), DI		// arg 1 - name
	MOVL	miblen+8(FP), SI		// arg 2 - namelen
	MOVQ	out+16(FP), DX		// arg 3 - oldp
	MOVQ	size+24(FP), R10		// arg 4 - oldlenp
	MOVQ	dst+32(FP), R8		// arg 5 - newp
	MOVQ	ndst+40(FP), R9		// arg 6 - newlen
	MOVQ	$SYS___sysctl, AX
	SYSCALL
	JCC 4(PC)
	NEGQ	AX
	MOVL	AX, ret+48(FP)
	RET
	MOVL	$0, AX
	MOVL	AX, ret+48(FP)
	RET

// int32 runtime·kqueue(void)
TEXT runtime·kqueue(SB),NOSPLIT,$0
	MOVQ	$0, DI
	MOVL	$SYS_kqueue, AX
	SYSCALL
	JCC	2(PC)
	NEGQ	AX
	MOVL	AX, 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
	MOVL	kq+0(FP), DI
	MOVQ	ch+8(FP), SI
	MOVL	nch+16(FP), DX
	MOVQ	ev+24(FP), R10
	MOVL	nev+32(FP), R8
	MOVQ	ts+40(FP), R9
	MOVL	$SYS___kevent50, AX
	SYSCALL
	JCC	2(PC)
	NEGQ	AX
	MOVL	AX, ret+48(FP)
	RET

// func fcntl(fd, cmd, arg int32) (int32, int32)
TEXT runtime·fcntl(SB),NOSPLIT,$0
	MOVL	fd+0(FP), DI	// fd
	MOVL	cmd+4(FP), SI	// cmd
	MOVL	arg+8(FP), DX	// arg
	MOVL	$SYS_fcntl, AX
	SYSCALL
	JCC	noerr
	MOVL	$-1, ret+16(FP)
	MOVL	AX, errno+20(FP)
	RET
noerr:
	MOVL	AX, ret+16(FP)
	MOVL	$0, errno+20(FP)
	RET