// 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, OpenBSD
// /usr/src/sys/kern/syscalls.master for syscall numbers.
//
#include "zasm_GOOS_GOARCH.h"
#include "../../cmd/ld/textflag.h"
#define CLOCK_MONOTONIC $3
// int64 tfork(void *param, uintptr psize, M *mp, G *gp, void (*fn)(void));
TEXT runtime·tfork(SB),NOSPLIT,$32
// Copy mp, gp and fn off parent stack for use by child.
MOVQ mm+16(FP), R8
MOVQ gg+24(FP), R9
MOVQ fn+32(FP), R12
MOVQ param+0(FP), DI
MOVQ psize+8(FP), SI
MOVL $8, AX // sys___tfork
SYSCALL
// Return if tfork syscall failed.
JCC 3(PC)
NEGQ AX
RET
// In parent, return.
CMPL AX, $0
JEQ 2(PC)
RET
// Set FS to point at m->tls.
LEAQ m_tls(R8), DI
CALL runtime·settls(SB)
// In child, set up new stack.
get_tls(CX)
MOVQ R8, m(CX)
MOVQ R9, g(CX)
CALL runtime·stackcheck(SB)
// Call fn
CALL R12
// It shouldn't return. If it does, exit
MOVQ $0, DI // arg 1 - notdead
MOVL $302, AX // sys___threxit
SYSCALL
JMP -3(PC) // keep exiting
TEXT runtime·osyield(SB),NOSPLIT,$0
MOVL $298, AX // sys_sched_yield
SYSCALL
RET
TEXT runtime·thrsleep(SB),NOSPLIT,$0
MOVQ 8(SP), DI // arg 1 - ident
MOVL 16(SP), SI // arg 2 - clock_id
MOVQ 24(SP), DX // arg 3 - tp
MOVQ 32(SP), R10 // arg 4 - lock
MOVQ 40(SP), R8 // arg 5 - abort
MOVL $94, AX // sys___thrsleep
SYSCALL
RET
TEXT runtime·thrwakeup(SB),NOSPLIT,$0
MOVQ 8(SP), DI // arg 1 - ident
MOVL 16(SP), SI // arg 2 - n
MOVL $301, AX // sys___thrwakeup
SYSCALL
RET
// Exit the entire program (like C exit)
TEXT runtime·exit(SB),NOSPLIT,$-8
MOVL 8(SP), DI // arg 1 - exit status
MOVL $1, AX // sys_exit
SYSCALL
MOVL $0xf1, 0xf1 // crash
RET
TEXT runtime·exit1(SB),NOSPLIT,$-8
MOVQ $0, DI // arg 1 - notdead
MOVL $302, AX // sys___threxit
SYSCALL
MOVL $0xf1, 0xf1 // crash
RET
TEXT runtime·open(SB),NOSPLIT,$-8
MOVQ 8(SP), DI // arg 1 pathname
MOVL 16(SP), SI // arg 2 flags
MOVL 20(SP), DX // arg 3 mode
MOVL $5, AX
SYSCALL
RET
TEXT runtime·close(SB),NOSPLIT,$-8
MOVL 8(SP), DI // arg 1 fd
MOVL $6, AX
SYSCALL
RET
TEXT runtime·read(SB),NOSPLIT,$-8
MOVL 8(SP), DI // arg 1 fd
MOVQ 16(SP), SI // arg 2 buf
MOVL 24(SP), DX // arg 3 count
MOVL $3, AX
SYSCALL
RET
TEXT runtime·write(SB),NOSPLIT,$-8
MOVL 8(SP), DI // arg 1 - fd
MOVQ 16(SP), SI // arg 2 - buf
MOVL 24(SP), DX // arg 3 - nbyte
MOVL $4, AX // sys_write
SYSCALL
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 $91, AX // sys_nanosleep
SYSCALL
RET
TEXT runtime·raise(SB),NOSPLIT,$16
MOVL $299, AX // sys_getthrid
SYSCALL
MOVQ AX, DI // arg 1 - pid
MOVL sig+0(FP), SI // arg 2 - signum
MOVL $37, AX // sys_kill
SYSCALL
RET
TEXT runtime·setitimer(SB),NOSPLIT,$-8
MOVL 8(SP), DI // arg 1 - which
MOVQ 16(SP), SI // arg 2 - itv
MOVQ 24(SP), DX // arg 3 - oitv
MOVL $69, AX // sys_setitimer
SYSCALL
RET
// func now() (sec int64, nsec int32)
TEXT time·now(SB), NOSPLIT, $32
MOVQ $0, DI // arg 1 - clock_id
LEAQ 8(SP), SI // arg 2 - tp
MOVL $87, AX // sys_clock_gettime
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·nanotime(SB),NOSPLIT,$24
MOVQ CLOCK_MONOTONIC, DI // arg 1 - clock_id
LEAQ 8(SP), SI // arg 2 - tp
MOVL $87, AX // sys_clock_gettime
SYSCALL
MOVQ 8(SP), AX // sec
MOVQ 16(SP), DX // nsec
// sec is in AX, nsec in DX
// return nsec in AX
IMULQ $1000000000, AX
ADDQ DX, AX
RET
TEXT runtime·sigaction(SB),NOSPLIT,$-8
MOVL 8(SP), DI // arg 1 - signum
MOVQ 16(SP), SI // arg 2 - nsa
MOVQ 24(SP), DX // arg 3 - osa
MOVL $46, AX
SYSCALL
JCC 2(PC)
MOVL $0xf1, 0xf1 // crash
RET
TEXT runtime·sigprocmask(SB),NOSPLIT,$0
MOVL 8(SP), DI // arg 1 - how
MOVL 12(SP), SI // arg 2 - set
MOVL $48, AX // sys_sigprocmask
SYSCALL
JCC 2(PC)
MOVL $0xf1, 0xf1 // crash
MOVL AX, oset+0(FP) // Return oset
RET
TEXT runtime·sigtramp(SB),NOSPLIT,$64
get_tls(BX)
// check that m exists
MOVQ m(BX), BP
CMPQ BP, $0
JNE 5(PC)
MOVQ DI, 0(SP)
MOVQ $runtime·badsignal(SB), AX
CALL AX
RET
// save g
MOVQ g(BX), R10
MOVQ R10, 40(SP)
// g = m->signal
MOVQ m_gsignal(BP), BP
MOVQ BP, g(BX)
MOVQ DI, 0(SP)
MOVQ SI, 8(SP)
MOVQ DX, 16(SP)
MOVQ R10, 24(SP)
CALL runtime·sighandler(SB)
// restore g
get_tls(BX)
MOVQ 40(SP), R10
MOVQ R10, g(BX)
RET
TEXT runtime·mmap(SB),NOSPLIT,$0
MOVQ 8(SP), DI // arg 1 - addr
MOVQ 16(SP), SI // arg 2 - len
MOVL 24(SP), DX // arg 3 - prot
MOVL 28(SP), R10 // arg 4 - flags
MOVL 32(SP), R8 // arg 5 - fd
MOVQ 36(SP), R9
SUBQ $16, SP
MOVQ R9, 8(SP) // arg 7 - offset (passed on stack)
MOVQ $0, R9 // arg 6 - pad
MOVL $197, AX
SYSCALL
ADDQ $16, SP
RET
TEXT runtime·munmap(SB),NOSPLIT,$0
MOVQ 8(SP), DI // arg 1 - addr
MOVQ 16(SP), SI // arg 2 - len
MOVL $73, AX // sys_munmap
SYSCALL
JCC 2(PC)
MOVL $0xf1, 0xf1 // crash
RET
TEXT runtime·madvise(SB),NOSPLIT,$0
MOVQ addr+0(FP), DI // arg 1 - addr
MOVQ len+8(FP), SI // arg 2 - len
MOVQ behav+16(FP), DX // arg 3 - behav
MOVQ $75, AX // sys_madvise
SYSCALL
// ignore failure - maybe pages are locked
RET
TEXT runtime·sigaltstack(SB),NOSPLIT,$-8
MOVQ new+8(SP), DI // arg 1 - nss
MOVQ old+16(SP), SI // arg 2 - oss
MOVQ $288, AX // sys_sigaltstack
SYSCALL
JCC 2(PC)
MOVL $0xf1, 0xf1 // crash
RET
// set tls base to DI
TEXT runtime·settls(SB),NOSPLIT,$0
// adjust for ELF: wants to use -16(FS) and -8(FS) for g and m
ADDQ $16, DI
MOVQ $329, AX // sys___settcb
SYSCALL
JCC 2(PC)
MOVL $0xf1, 0xf1 // crash
RET
TEXT runtime·sysctl(SB),NOSPLIT,$0
MOVQ 8(SP), DI // arg 1 - name
MOVL 16(SP), SI // arg 2 - namelen
MOVQ 24(SP), DX // arg 3 - oldp
MOVQ 32(SP), R10 // arg 4 - oldlenp
MOVQ 40(SP), R8 // arg 5 - newp
MOVQ 48(SP), R9 // arg 6 - newlen
MOVQ $202, AX // sys___sysctl
SYSCALL
JCC 3(PC)
NEGQ AX
RET
MOVL $0, AX
RET
// int32 runtime·kqueue(void);
TEXT runtime·kqueue(SB),NOSPLIT,$0
MOVQ $0, DI
MOVQ $0, SI
MOVQ $0, DX
MOVL $269, AX
SYSCALL
JCC 2(PC)
NEGQ AX
RET
// int32 runtime·kevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout);
TEXT runtime·kevent(SB),NOSPLIT,$0
MOVL 8(SP), DI
MOVQ 16(SP), SI
MOVL 24(SP), DX
MOVQ 32(SP), R10
MOVL 40(SP), R8
MOVQ 48(SP), R9
MOVL $72, AX
SYSCALL
JCC 2(PC)
NEGQ AX
RET
// void runtime·closeonexec(int32 fd);
TEXT runtime·closeonexec(SB),NOSPLIT,$0
MOVL 8(SP), DI // fd
MOVQ $2, SI // F_SETFD
MOVQ $1, DX // FD_CLOEXEC
MOVL $92, AX // fcntl
SYSCALL
RET