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// Copyright 2015 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.
#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"
// from ../syscall/zsysnum_plan9.go
#define SYS_SYSR1 0
#define SYS_BIND 2
#define SYS_CHDIR 3
#define SYS_CLOSE 4
#define SYS_DUP 5
#define SYS_ALARM 6
#define SYS_EXEC 7
#define SYS_EXITS 8
#define SYS_FAUTH 10
#define SYS_SEGBRK 12
#define SYS_OPEN 14
#define SYS_OSEEK 16
#define SYS_SLEEP 17
#define SYS_RFORK 19
#define SYS_PIPE 21
#define SYS_CREATE 22
#define SYS_FD2PATH 23
#define SYS_BRK_ 24
#define SYS_REMOVE 25
#define SYS_NOTIFY 28
#define SYS_NOTED 29
#define SYS_SEGATTACH 30
#define SYS_SEGDETACH 31
#define SYS_SEGFREE 32
#define SYS_SEGFLUSH 33
#define SYS_RENDEZVOUS 34
#define SYS_UNMOUNT 35
#define SYS_SEMACQUIRE 37
#define SYS_SEMRELEASE 38
#define SYS_SEEK 39
#define SYS_FVERSION 40
#define SYS_ERRSTR 41
#define SYS_STAT 42
#define SYS_FSTAT 43
#define SYS_WSTAT 44
#define SYS_FWSTAT 45
#define SYS_MOUNT 46
#define SYS_AWAIT 47
#define SYS_PREAD 50
#define SYS_PWRITE 51
#define SYS_TSEMACQUIRE 52
#define SYS_NSEC 53
//func open(name *byte, mode, perm int32) int32
TEXT runtime·open(SB),NOSPLIT,$0-16
MOVW $SYS_OPEN, R0
SWI $0
MOVW R0, ret+12(FP)
RET
//func pread(fd int32, buf unsafe.Pointer, nbytes int32, offset int64) int32
TEXT runtime·pread(SB),NOSPLIT,$0-24
MOVW $SYS_PREAD, R0
SWI $0
MOVW R0, ret+20(FP)
RET
//func pwrite(fd int32, buf unsafe.Pointer, nbytes int32, offset int64) int32
TEXT runtime·pwrite(SB),NOSPLIT,$0-24
MOVW $SYS_PWRITE, R0
SWI $0
MOVW R0, ret+20(FP)
RET
//func seek(fd int32, offset int64, whence int32) int64
TEXT runtime·seek(SB),NOSPLIT,$0-24
MOVW $ret_lo+16(FP), R0
MOVW 0(R13), R1
MOVW R0, 0(R13)
MOVW.W R1, -4(R13)
MOVW $SYS_SEEK, R0
SWI $0
MOVW.W R1, 4(R13)
CMP $-1, R0
MOVW.EQ R0, ret_lo+16(FP)
MOVW.EQ R0, ret_hi+20(FP)
RET
//func closefd(fd int32) int32
TEXT runtime·closefd(SB),NOSPLIT,$0-8
MOVW $SYS_CLOSE, R0
SWI $0
MOVW R0, ret+4(FP)
RET
//func exits(msg *byte)
TEXT runtime·exits(SB),NOSPLIT,$0-4
MOVW $SYS_EXITS, R0
SWI $0
RET
//func brk_(addr unsafe.Pointer) int32
TEXT runtime·brk_(SB),NOSPLIT,$0-8
MOVW $SYS_BRK_, R0
SWI $0
MOVW R0, ret+4(FP)
RET
//func sleep(ms int32) int32
TEXT runtime·sleep(SB),NOSPLIT,$0-8
MOVW $SYS_SLEEP, R0
SWI $0
MOVW R0, ret+4(FP)
RET
//func plan9_semacquire(addr *uint32, block int32) int32
TEXT runtime·plan9_semacquire(SB),NOSPLIT,$0-12
MOVW $SYS_SEMACQUIRE, R0
SWI $0
MOVW R0, ret+8(FP)
RET
//func plan9_tsemacquire(addr *uint32, ms int32) int32
TEXT runtime·plan9_tsemacquire(SB),NOSPLIT,$0-12
MOVW $SYS_TSEMACQUIRE, R0
SWI $0
MOVW R0, ret+8(FP)
RET
//func nsec(*int64) int64
TEXT runtime·nsec(SB),NOSPLIT|NOFRAME,$0-12
MOVW $SYS_NSEC, R0
SWI $0
MOVW arg+0(FP), R1
MOVW 0(R1), R0
MOVW R0, ret_lo+4(FP)
MOVW 4(R1), R0
MOVW R0, ret_hi+8(FP)
RET
// func walltime() (sec int64, nsec int32)
TEXT runtime·walltime(SB),NOSPLIT,$12-12
// use nsec system call to get current time in nanoseconds
MOVW $sysnsec_lo-8(SP), R0 // destination addr
MOVW R0,res-12(SP)
MOVW $SYS_NSEC, R0
SWI $0
MOVW sysnsec_lo-8(SP), R1 // R1:R2 = nsec
MOVW sysnsec_hi-4(SP), R2
// multiply nanoseconds by reciprocal of 10**9 (scaled by 2**61)
// to get seconds (96 bit scaled result)
MOVW $0x89705f41, R3 // 2**61 * 10**-9
MULLU R1,R3,(R6,R5) // R5:R6:R7 = R1:R2 * R3
MOVW $0,R7
MULALU R2,R3,(R7,R6)
// unscale by discarding low 32 bits, shifting the rest by 29
MOVW R6>>29,R6 // R6:R7 = (R5:R6:R7 >> 61)
ORR R7<<3,R6
MOVW R7>>29,R7
// subtract (10**9 * sec) from nsec to get nanosecond remainder
MOVW $1000000000, R5 // 10**9
MULLU R6,R5,(R9,R8) // R8:R9 = R6:R7 * R5
MULA R7,R5,R9,R9
SUB.S R8,R1 // R1:R2 -= R8:R9
SBC R9,R2
// because reciprocal was a truncated repeating fraction, quotient
// may be slightly too small -- adjust to make remainder < 10**9
CMP R5,R1 // if remainder > 10**9
SUB.HS R5,R1 // remainder -= 10**9
ADD.HS $1,R6 // sec += 1
MOVW R6,sec_lo+0(FP)
MOVW R7,sec_hi+4(FP)
MOVW R1,nsec+8(FP)
RET
//func notify(fn unsafe.Pointer) int32
TEXT runtime·notify(SB),NOSPLIT,$0-8
MOVW $SYS_NOTIFY, R0
SWI $0
MOVW R0, ret+4(FP)
RET
//func noted(mode int32) int32
TEXT runtime·noted(SB),NOSPLIT,$0-8
MOVW $SYS_NOTED, R0
SWI $0
MOVW R0, ret+4(FP)
RET
//func plan9_semrelease(addr *uint32, count int32) int32
TEXT runtime·plan9_semrelease(SB),NOSPLIT,$0-12
MOVW $SYS_SEMRELEASE, R0
SWI $0
MOVW R0, ret+8(FP)
RET
//func rfork(flags int32) int32
TEXT runtime·rfork(SB),NOSPLIT,$0-8
MOVW $SYS_RFORK, R0
SWI $0
MOVW R0, ret+4(FP)
RET
//func tstart_plan9(newm *m)
TEXT runtime·tstart_plan9(SB),NOSPLIT,$4-4
MOVW newm+0(FP), R1
MOVW m_g0(R1), g
// Layout new m scheduler stack on os stack.
MOVW R13, R0
MOVW R0, g_stack+stack_hi(g)
SUB $(64*1024), R0
MOVW R0, (g_stack+stack_lo)(g)
MOVW R0, g_stackguard0(g)
MOVW R0, g_stackguard1(g)
// Initialize procid from TOS struct.
MOVW _tos(SB), R0
MOVW 48(R0), R0
MOVW R0, m_procid(R1) // save pid as m->procid
BL runtime·mstart(SB)
// Exit the thread.
MOVW $0, R0
MOVW R0, 4(R13)
CALL runtime·exits(SB)
JMP 0(PC)
//func sigtramp(ureg, note unsafe.Pointer)
TEXT runtime·sigtramp(SB),NOSPLIT,$0-8
// check that g and m exist
CMP $0, g
BEQ 4(PC)
MOVW g_m(g), R0
CMP $0, R0
BNE 2(PC)
BL runtime·badsignal2(SB) // will exit
// save args
MOVW ureg+0(FP), R1
MOVW note+4(FP), R2
// change stack
MOVW m_gsignal(R0), R3
MOVW (g_stack+stack_hi)(R3), R13
// make room for args, retval and g
SUB $24, R13
// save g
MOVW g, R3
MOVW R3, 20(R13)
// g = m->gsignal
MOVW m_gsignal(R0), g
// load args and call sighandler
ADD $4,R13,R5
MOVM.IA [R1-R3], (R5)
BL runtime·sighandler(SB)
MOVW 16(R13), R0 // retval
// restore g
MOVW 20(R13), g
// call noted(R0)
MOVW R0, 4(R13)
BL runtime·noted(SB)
RET
//func sigpanictramp()
TEXT runtime·sigpanictramp(SB),NOSPLIT,$0-0
MOVW.W R0, -4(R13)
B runtime·sigpanic(SB)
//func setfpmasks()
// Only used by the 64-bit runtime.
TEXT runtime·setfpmasks(SB),NOSPLIT,$0
RET
#define ERRMAX 128 /* from os_plan9.h */
// func errstr() string
// Only used by package syscall.
// Grab error string due to a syscall made
// in entersyscall mode, without going
// through the allocator (issue 4994).
// See ../syscall/asm_plan9_arm.s:/·Syscall/
TEXT runtime·errstr(SB),NOSPLIT,$0-8
MOVW g_m(g), R0
MOVW (m_mOS+mOS_errstr)(R0), R1
MOVW R1, ret_base+0(FP)
MOVW $ERRMAX, R2
MOVW R2, ret_len+4(FP)
MOVW $SYS_ERRSTR, R0
SWI $0
MOVW R1, R2
MOVBU 0(R2), R0
CMP $0, R0
BEQ 3(PC)
ADD $1, R2
B -4(PC)
SUB R1, R2
MOVW R2, ret_len+4(FP)
RET
TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0
B runtime·armPublicationBarrier(SB)
// never called (cgo not supported)
TEXT runtime·read_tls_fallback(SB),NOSPLIT|NOFRAME,$0
MOVW $0, R0
MOVW R0, (R0)
RET
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