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https://github.com/golang/go
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3b263e43a9
On other systems we use "SWI $n". Change Plan 9 files to be consistent. Generated binary is unchanged. Fixes #20378. Change-Id: Ia2a722061da2450c7b30cb707ed4f172fafecf74 Reviewed-on: https://go-review.googlesource.com/43533 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
319 lines
7.0 KiB
ArmAsm
319 lines
7.0 KiB
ArmAsm
// Copyright 2015 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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#include "go_asm.h"
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#include "go_tls.h"
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#include "textflag.h"
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// from ../syscall/zsysnum_plan9.go
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#define SYS_SYSR1 0
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#define SYS_BIND 2
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#define SYS_CHDIR 3
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#define SYS_CLOSE 4
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#define SYS_DUP 5
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#define SYS_ALARM 6
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#define SYS_EXEC 7
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#define SYS_EXITS 8
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#define SYS_FAUTH 10
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#define SYS_SEGBRK 12
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#define SYS_OPEN 14
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#define SYS_OSEEK 16
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#define SYS_SLEEP 17
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#define SYS_RFORK 19
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#define SYS_PIPE 21
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#define SYS_CREATE 22
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#define SYS_FD2PATH 23
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#define SYS_BRK_ 24
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#define SYS_REMOVE 25
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#define SYS_NOTIFY 28
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#define SYS_NOTED 29
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#define SYS_SEGATTACH 30
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#define SYS_SEGDETACH 31
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#define SYS_SEGFREE 32
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#define SYS_SEGFLUSH 33
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#define SYS_RENDEZVOUS 34
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#define SYS_UNMOUNT 35
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#define SYS_SEMACQUIRE 37
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#define SYS_SEMRELEASE 38
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#define SYS_SEEK 39
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#define SYS_FVERSION 40
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#define SYS_ERRSTR 41
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#define SYS_STAT 42
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#define SYS_FSTAT 43
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#define SYS_WSTAT 44
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#define SYS_FWSTAT 45
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#define SYS_MOUNT 46
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#define SYS_AWAIT 47
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#define SYS_PREAD 50
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#define SYS_PWRITE 51
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#define SYS_TSEMACQUIRE 52
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#define SYS_NSEC 53
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//func open(name *byte, mode, perm int32) int32
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TEXT runtime·open(SB),NOSPLIT,$0-16
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MOVW $SYS_OPEN, R0
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SWI $0
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MOVW R0, ret+12(FP)
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RET
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//func pread(fd int32, buf unsafe.Pointer, nbytes int32, offset int64) int32
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TEXT runtime·pread(SB),NOSPLIT,$0-24
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MOVW $SYS_PREAD, R0
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SWI $0
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MOVW R0, ret+20(FP)
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RET
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//func pwrite(fd int32, buf unsafe.Pointer, nbytes int32, offset int64) int32
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TEXT runtime·pwrite(SB),NOSPLIT,$0-24
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MOVW $SYS_PWRITE, R0
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SWI $0
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MOVW R0, ret+20(FP)
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RET
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//func seek(fd int32, offset int64, whence int32) int64
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TEXT runtime·seek(SB),NOSPLIT,$0-24
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MOVW $ret_lo+16(FP), R0
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MOVW 0(R13), R1
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MOVW R0, 0(R13)
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MOVW.W R1, -4(R13)
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MOVW $SYS_SEEK, R0
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SWI $0
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MOVW.W R1, 4(R13)
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CMP $-1, R0
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MOVW.EQ R0, ret_lo+16(FP)
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MOVW.EQ R0, ret_hi+20(FP)
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RET
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//func closefd(fd int32) int32
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TEXT runtime·closefd(SB),NOSPLIT,$0-8
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MOVW $SYS_CLOSE, R0
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SWI $0
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MOVW R0, ret+4(FP)
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RET
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//func exits(msg *byte)
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TEXT runtime·exits(SB),NOSPLIT,$0-4
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MOVW $SYS_EXITS, R0
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SWI $0
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RET
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//func brk_(addr unsafe.Pointer) int32
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TEXT runtime·brk_(SB),NOSPLIT,$0-8
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MOVW $SYS_BRK_, R0
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SWI $0
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MOVW R0, ret+4(FP)
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RET
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//func sleep(ms int32) int32
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TEXT runtime·sleep(SB),NOSPLIT,$0-8
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MOVW $SYS_SLEEP, R0
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SWI $0
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MOVW R0, ret+4(FP)
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RET
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//func plan9_semacquire(addr *uint32, block int32) int32
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TEXT runtime·plan9_semacquire(SB),NOSPLIT,$0-12
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MOVW $SYS_SEMACQUIRE, R0
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SWI $0
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MOVW R0, ret+8(FP)
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RET
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//func plan9_tsemacquire(addr *uint32, ms int32) int32
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TEXT runtime·plan9_tsemacquire(SB),NOSPLIT,$0-12
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MOVW $SYS_TSEMACQUIRE, R0
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SWI $0
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MOVW R0, ret+8(FP)
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RET
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//func nsec(*int64) int64
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TEXT runtime·nsec(SB),NOSPLIT,$-4-12
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MOVW $SYS_NSEC, R0
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SWI $0
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MOVW arg+0(FP), R1
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MOVW 0(R1), R0
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MOVW R0, ret_lo+4(FP)
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MOVW 4(R1), R0
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MOVW R0, ret_hi+8(FP)
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RET
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// time.now() (sec int64, nsec int32)
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TEXT runtime·walltime(SB),NOSPLIT,$12-12
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// use nsec system call to get current time in nanoseconds
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MOVW $sysnsec_lo-8(SP), R0 // destination addr
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MOVW R0,res-12(SP)
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MOVW $SYS_NSEC, R0
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SWI $0
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MOVW sysnsec_lo-8(SP), R1 // R1:R2 = nsec
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MOVW sysnsec_hi-4(SP), R2
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// multiply nanoseconds by reciprocal of 10**9 (scaled by 2**61)
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// to get seconds (96 bit scaled result)
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MOVW $0x89705f41, R3 // 2**61 * 10**-9
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MULLU R1,R3,(R6,R5) // R5:R6:R7 = R1:R2 * R3
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MOVW $0,R7
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MULALU R2,R3,(R7,R6)
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// unscale by discarding low 32 bits, shifting the rest by 29
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MOVW R6>>29,R6 // R6:R7 = (R5:R6:R7 >> 61)
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ORR R7<<3,R6
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MOVW R7>>29,R7
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// subtract (10**9 * sec) from nsec to get nanosecond remainder
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MOVW $1000000000, R5 // 10**9
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MULLU R6,R5,(R9,R8) // R8:R9 = R6:R7 * R5
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MULA R7,R5,R9,R9
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SUB.S R8,R1 // R1:R2 -= R8:R9
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SBC R9,R2
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// because reciprocal was a truncated repeating fraction, quotient
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// may be slightly too small -- adjust to make remainder < 10**9
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CMP R5,R1 // if remainder > 10**9
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SUB.HS R5,R1 // remainder -= 10**9
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ADD.HS $1,R6 // sec += 1
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MOVW R6,sec_lo+0(FP)
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MOVW R7,sec_hi+4(FP)
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MOVW R1,nsec+8(FP)
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RET
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//func notify(fn unsafe.Pointer) int32
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TEXT runtime·notify(SB),NOSPLIT,$0-8
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MOVW $SYS_NOTIFY, R0
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SWI $0
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MOVW R0, ret+4(FP)
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RET
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//func noted(mode int32) int32
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TEXT runtime·noted(SB),NOSPLIT,$0-8
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MOVW $SYS_NOTED, R0
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SWI $0
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MOVW R0, ret+4(FP)
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RET
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//func plan9_semrelease(addr *uint32, count int32) int32
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TEXT runtime·plan9_semrelease(SB),NOSPLIT,$0-12
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MOVW $SYS_SEMRELEASE, R0
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SWI $0
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MOVW R0, ret+8(FP)
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RET
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//func rfork(flags int32) int32
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TEXT runtime·rfork(SB),NOSPLIT,$0-8
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MOVW $SYS_RFORK, R0
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SWI $0
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MOVW R0, ret+4(FP)
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RET
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//func tstart_plan9(newm *m)
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TEXT runtime·tstart_plan9(SB),NOSPLIT,$0-4
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MOVW newm+0(FP), R1
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MOVW m_g0(R1), g
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// Layout new m scheduler stack on os stack.
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MOVW R13, R0
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MOVW R0, g_stack+stack_hi(g)
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SUB $(64*1024), R0
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MOVW R0, (g_stack+stack_lo)(g)
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MOVW R0, g_stackguard0(g)
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MOVW R0, g_stackguard1(g)
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// Initialize procid from TOS struct.
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MOVW _tos(SB), R0
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MOVW 48(R0), R0
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MOVW R0, m_procid(R1) // save pid as m->procid
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BL runtime·mstart(SB)
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MOVW $0x1234, R0
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MOVW R0, 0(R0) // not reached
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RET
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//func sigtramp(ureg, note unsafe.Pointer)
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TEXT runtime·sigtramp(SB),NOSPLIT,$0-8
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// check that g and m exist
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CMP $0, g
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BEQ 4(PC)
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MOVW g_m(g), R0
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CMP $0, R0
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BNE 2(PC)
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BL runtime·badsignal2(SB) // will exit
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// save args
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MOVW ureg+0(FP), R1
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MOVW note+4(FP), R2
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// change stack
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MOVW m_gsignal(R0), R3
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MOVW (g_stack+stack_hi)(R3), R13
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// make room for args, retval and g
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SUB $24, R13
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// save g
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MOVW g, R3
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MOVW R3, 20(R13)
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// g = m->gsignal
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MOVW m_gsignal(R0), g
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// load args and call sighandler
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ADD $4,R13,R5
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MOVM.IA [R1-R3], (R5)
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BL runtime·sighandler(SB)
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MOVW 16(R13), R0 // retval
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// restore g
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MOVW 20(R13), g
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// call noted(R0)
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MOVW R0, 4(R13)
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BL runtime·noted(SB)
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RET
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//func sigpanictramp()
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TEXT runtime·sigpanictramp(SB),NOSPLIT,$0-0
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MOVW.W R0, -4(R13)
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B runtime·sigpanic(SB)
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//func setfpmasks()
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// Only used by the 64-bit runtime.
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TEXT runtime·setfpmasks(SB),NOSPLIT,$0
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RET
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#define ERRMAX 128 /* from os_plan9.h */
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// func errstr() string
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// Only used by package syscall.
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// Grab error string due to a syscall made
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// in entersyscall mode, without going
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// through the allocator (issue 4994).
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// See ../syscall/asm_plan9_arm.s:/·Syscall/
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TEXT runtime·errstr(SB),NOSPLIT,$0-8
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MOVW g_m(g), R0
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MOVW (m_mOS+mOS_errstr)(R0), R1
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MOVW R1, ret_base+0(FP)
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MOVW $ERRMAX, R2
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MOVW R2, ret_len+4(FP)
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MOVW $SYS_ERRSTR, R0
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SWI $0
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MOVW R1, R2
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MOVBU 0(R2), R0
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CMP $0, R0
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BEQ 3(PC)
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ADD $1, R2
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B -4(PC)
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SUB R1, R2
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MOVW R2, ret_len+4(FP)
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RET
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TEXT ·publicationBarrier(SB),NOSPLIT,$-4-0
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B runtime·armPublicationBarrier(SB)
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// never called (cgo not supported)
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TEXT runtime·read_tls_fallback(SB),NOSPLIT,$-4
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MOVW $0, R0
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MOVW R0, (R0)
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RET
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