// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//
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// System calls and other sys.stuff for AMD64, OpenBSD
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// /usr/src/sys/kern/syscalls.master for syscall numbers.
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//
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#include "go_asm.h"
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#include "go_tls.h"
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#include "textflag.h"
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#define CLOCK_MONOTONIC $3
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// int32 tfork(void *param, uintptr psize, M *mp, G *gp, void (*fn)(void));
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TEXT runtime·tfork(SB),NOSPLIT,$32
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// Copy mp, gp and fn off parent stack for use by child.
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MOVQ mm+16(FP), R8
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MOVQ gg+24(FP), R9
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MOVQ fn+32(FP), R12
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MOVQ param+0(FP), DI
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MOVQ psize+8(FP), SI
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MOVL $8, AX // sys___tfork
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SYSCALL
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// Return if tfork syscall failed.
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JCC 4(PC)
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NEGQ AX
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MOVL AX, ret+40(FP)
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RET
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// In parent, return.
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CMPL AX, $0
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JEQ 3(PC)
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MOVL AX, ret+40(FP)
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RET
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// Set FS to point at m->tls.
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LEAQ m_tls(R8), DI
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CALL runtime·settls(SB)
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// In child, set up new stack.
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get_tls(CX)
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MOVQ R8, g_m(R9)
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MOVQ R9, g(CX)
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CALL runtime·stackcheck(SB)
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// Call fn
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CALL R12
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// It shouldn't return. If it does, exit
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MOVQ $0, DI // arg 1 - notdead
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MOVL $302, AX // sys___threxit
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SYSCALL
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JMP -3(PC) // keep exiting
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TEXT runtime·osyield(SB),NOSPLIT,$0
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MOVL $298, AX // sys_sched_yield
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SYSCALL
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RET
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TEXT runtime·thrsleep(SB),NOSPLIT,$0
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MOVQ ident+0(FP), DI // arg 1 - ident
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MOVL clock_id+8(FP), SI // arg 2 - clock_id
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MOVQ tsp+16(FP), DX // arg 3 - tp
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MOVQ lock+24(FP), R10 // arg 4 - lock
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MOVQ abort+32(FP), R8 // arg 5 - abort
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MOVL $94, AX // sys___thrsleep
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SYSCALL
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MOVL AX, ret+40(FP)
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RET
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TEXT runtime·thrwakeup(SB),NOSPLIT,$0
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MOVQ ident+0(FP), DI // arg 1 - ident
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MOVL n+8(FP), SI // arg 2 - n
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MOVL $301, AX // sys___thrwakeup
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SYSCALL
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MOVL AX, ret+16(FP)
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RET
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// Exit the entire program (like C exit)
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TEXT runtime·exit(SB),NOSPLIT,$-8
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MOVL code+0(FP), DI // arg 1 - exit status
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MOVL $1, AX // sys_exit
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SYSCALL
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MOVL $0xf1, 0xf1 // crash
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RET
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// func exitThread(wait *uint32)
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TEXT runtime·exitThread(SB),NOSPLIT,$0-8
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MOVQ wait+0(FP), DI // arg 1 - notdead
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MOVL $302, AX // sys___threxit
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SYSCALL
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MOVL $0xf1, 0xf1 // crash
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JMP 0(PC)
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TEXT runtime·open(SB),NOSPLIT,$-8
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MOVQ name+0(FP), DI // arg 1 pathname
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MOVL mode+8(FP), SI // arg 2 flags
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MOVL perm+12(FP), DX // arg 3 mode
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MOVL $5, AX
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SYSCALL
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JCC 2(PC)
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MOVL $-1, AX
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MOVL AX, ret+16(FP)
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RET
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TEXT runtime·closefd(SB),NOSPLIT,$-8
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MOVL fd+0(FP), DI // arg 1 fd
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MOVL $6, AX
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SYSCALL
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JCC 2(PC)
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MOVL $-1, AX
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MOVL AX, ret+8(FP)
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RET
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TEXT runtime·read(SB),NOSPLIT,$-8
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MOVL fd+0(FP), DI // arg 1 fd
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MOVQ p+8(FP), SI // arg 2 buf
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MOVL n+16(FP), DX // arg 3 count
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MOVL $3, AX
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SYSCALL
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JCC 2(PC)
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MOVL $-1, AX
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MOVL AX, ret+24(FP)
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RET
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TEXT runtime·write(SB),NOSPLIT,$-8
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MOVQ fd+0(FP), DI // arg 1 - fd
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MOVQ p+8(FP), SI // arg 2 - buf
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MOVL n+16(FP), DX // arg 3 - nbyte
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MOVL $4, AX // sys_write
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SYSCALL
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JCC 2(PC)
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MOVL $-1, AX
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MOVL AX, ret+24(FP)
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RET
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TEXT runtime·usleep(SB),NOSPLIT,$16
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MOVL $0, DX
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MOVL usec+0(FP), AX
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MOVL $1000000, CX
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DIVL CX
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MOVQ AX, 0(SP) // tv_sec
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MOVL $1000, AX
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MULL DX
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MOVQ AX, 8(SP) // tv_nsec
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MOVQ SP, DI // arg 1 - rqtp
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MOVQ $0, SI // arg 2 - rmtp
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MOVL $91, AX // sys_nanosleep
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SYSCALL
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RET
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TEXT runtime·raise(SB),NOSPLIT,$16
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MOVL $299, AX // sys_getthrid
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SYSCALL
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MOVQ AX, DI // arg 1 - tid
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MOVL sig+0(FP), SI // arg 2 - signum
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MOVQ $0, DX // arg 3 - tcb
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MOVL $119, AX // sys_thrkill
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SYSCALL
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RET
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TEXT runtime·raiseproc(SB),NOSPLIT,$16
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MOVL $20, AX // sys_getpid
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SYSCALL
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MOVQ AX, DI // arg 1 - pid
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MOVL sig+0(FP), SI // arg 2 - signum
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MOVL $122, AX // sys_kill
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SYSCALL
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RET
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TEXT runtime·setitimer(SB),NOSPLIT,$-8
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MOVL mode+0(FP), DI // arg 1 - which
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MOVQ new+8(FP), SI // arg 2 - itv
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MOVQ old+16(FP), DX // arg 3 - oitv
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MOVL $69, AX // sys_setitimer
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SYSCALL
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RET
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// func walltime() (sec int64, nsec int32)
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TEXT runtime·walltime(SB), NOSPLIT, $32
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MOVQ $0, DI // arg 1 - clock_id
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LEAQ 8(SP), SI // arg 2 - tp
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MOVL $87, AX // sys_clock_gettime
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SYSCALL
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MOVQ 8(SP), AX // sec
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MOVQ 16(SP), DX // nsec
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// sec is in AX, nsec in DX
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MOVQ AX, sec+0(FP)
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MOVL DX, nsec+8(FP)
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RET
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TEXT runtime·nanotime(SB),NOSPLIT,$24
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MOVQ CLOCK_MONOTONIC, DI // arg 1 - clock_id
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LEAQ 8(SP), SI // arg 2 - tp
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MOVL $87, AX // sys_clock_gettime
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SYSCALL
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MOVQ 8(SP), AX // sec
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MOVQ 16(SP), DX // nsec
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// sec is in AX, nsec in DX
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// return nsec in AX
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IMULQ $1000000000, AX
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ADDQ DX, AX
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MOVQ AX, ret+0(FP)
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RET
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TEXT runtime·sigaction(SB),NOSPLIT,$-8
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MOVL sig+0(FP), DI // arg 1 - signum
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MOVQ new+8(FP), SI // arg 2 - nsa
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MOVQ old+16(FP), DX // arg 3 - osa
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MOVL $46, AX
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SYSCALL
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JCC 2(PC)
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MOVL $0xf1, 0xf1 // crash
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RET
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TEXT runtime·obsdsigprocmask(SB),NOSPLIT,$0
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MOVL how+0(FP), DI // arg 1 - how
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MOVL new+4(FP), SI // arg 2 - set
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MOVL $48, AX // sys_sigprocmask
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SYSCALL
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JCC 2(PC)
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MOVL $0xf1, 0xf1 // crash
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MOVL AX, ret+8(FP)
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RET
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TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
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MOVQ fn+0(FP), AX
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MOVL sig+8(FP), DI
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MOVQ info+16(FP), SI
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MOVQ ctx+24(FP), DX
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PUSHQ BP
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MOVQ SP, BP
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ANDQ $~15, SP // alignment for x86_64 ABI
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CALL AX
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MOVQ BP, SP
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POPQ BP
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RET
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TEXT runtime·sigtramp(SB),NOSPLIT,$72
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// Save callee-saved C registers, since the caller may be a C signal handler.
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MOVQ BX, bx-8(SP)
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MOVQ BP, bp-16(SP) // save in case GOEXPERIMENT=noframepointer is set
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MOVQ R12, r12-24(SP)
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MOVQ R13, r13-32(SP)
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MOVQ R14, r14-40(SP)
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MOVQ R15, r15-48(SP)
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// We don't save mxcsr or the x87 control word because sigtrampgo doesn't
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// modify them.
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MOVQ DX, ctx-56(SP)
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MOVQ SI, info-64(SP)
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MOVQ DI, signum-72(SP)
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CALL runtime·sigtrampgo(SB)
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MOVQ r15-48(SP), R15
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MOVQ r14-40(SP), R14
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MOVQ r13-32(SP), R13
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MOVQ r12-24(SP), R12
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MOVQ bp-16(SP), BP
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MOVQ bx-8(SP), BX
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RET
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TEXT runtime·mmap(SB),NOSPLIT,$0
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MOVQ addr+0(FP), DI // arg 1 - addr
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MOVQ n+8(FP), SI // arg 2 - len
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MOVL prot+16(FP), DX // arg 3 - prot
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MOVL flags+20(FP), R10 // arg 4 - flags
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MOVL fd+24(FP), R8 // arg 5 - fd
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MOVL off+28(FP), R9
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SUBQ $16, SP
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MOVQ R9, 8(SP) // arg 7 - offset (passed on stack)
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MOVQ $0, R9 // arg 6 - pad
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MOVL $197, AX
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SYSCALL
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JCC ok
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ADDQ $16, SP
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MOVQ $0, p+32(FP)
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MOVQ AX, err+40(FP)
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RET
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ok:
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ADDQ $16, SP
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MOVQ AX, p+32(FP)
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MOVQ $0, err+40(FP)
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RET
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TEXT runtime·munmap(SB),NOSPLIT,$0
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MOVQ addr+0(FP), DI // arg 1 - addr
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MOVQ n+8(FP), SI // arg 2 - len
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MOVL $73, AX // sys_munmap
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SYSCALL
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JCC 2(PC)
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MOVL $0xf1, 0xf1 // crash
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RET
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TEXT runtime·madvise(SB),NOSPLIT,$0
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MOVQ addr+0(FP), DI // arg 1 - addr
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MOVQ n+8(FP), SI // arg 2 - len
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MOVL flags+16(FP), DX // arg 3 - behav
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MOVQ $75, AX // sys_madvise
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SYSCALL
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JCC 2(PC)
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MOVL $-1, AX
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MOVL AX, ret+24(FP)
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RET
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TEXT runtime·sigaltstack(SB),NOSPLIT,$-8
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MOVQ new+0(FP), DI // arg 1 - nss
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MOVQ old+8(FP), SI // arg 2 - oss
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MOVQ $288, AX // sys_sigaltstack
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SYSCALL
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JCC 2(PC)
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MOVL $0xf1, 0xf1 // crash
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RET
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// set tls base to DI
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TEXT runtime·settls(SB),NOSPLIT,$0
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// adjust for ELF: wants to use -8(FS) for g
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ADDQ $8, DI
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MOVQ $329, AX // sys___settcb
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SYSCALL
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JCC 2(PC)
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MOVL $0xf1, 0xf1 // crash
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RET
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TEXT runtime·sysctl(SB),NOSPLIT,$0
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MOVQ mib+0(FP), DI // arg 1 - name
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MOVL miblen+8(FP), SI // arg 2 - namelen
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MOVQ out+16(FP), DX // arg 3 - oldp
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MOVQ size+24(FP), R10 // arg 4 - oldlenp
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MOVQ dst+32(FP), R8 // arg 5 - newp
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MOVQ ndst+40(FP), R9 // arg 6 - newlen
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MOVQ $202, AX // sys___sysctl
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SYSCALL
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JCC 4(PC)
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NEGQ AX
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MOVL AX, ret+48(FP)
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RET
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MOVL $0, AX
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MOVL AX, ret+48(FP)
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RET
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// int32 runtime·kqueue(void);
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TEXT runtime·kqueue(SB),NOSPLIT,$0
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MOVQ $0, DI
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MOVQ $0, SI
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MOVQ $0, DX
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MOVL $269, AX
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SYSCALL
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JCC 2(PC)
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NEGQ AX
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MOVL AX, ret+0(FP)
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RET
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// int32 runtime·kevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout);
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TEXT runtime·kevent(SB),NOSPLIT,$0
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MOVL kq+0(FP), DI
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MOVQ ch+8(FP), SI
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MOVL nch+16(FP), DX
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MOVQ ev+24(FP), R10
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MOVL nev+32(FP), R8
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MOVQ ts+40(FP), R9
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MOVL $72, AX
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SYSCALL
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JCC 2(PC)
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NEGQ AX
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MOVL AX, ret+48(FP)
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RET
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// void runtime·closeonexec(int32 fd);
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TEXT runtime·closeonexec(SB),NOSPLIT,$0
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MOVL fd+0(FP), DI // fd
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MOVQ $2, SI // F_SETFD
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MOVQ $1, DX // FD_CLOEXEC
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MOVL $92, AX // fcntl
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SYSCALL
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RET
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