File size: 3,327 Bytes
04dc9f2 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 | // 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.
#include "textflag.h"
#include "funcdata.h"
#define SYS_ERRSTR 41 /* from zsysnum_plan9.go */
#define SYS_SEEK 39 /* from zsysnum_plan9.go */
// System call support for plan9 on arm
//func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err ErrorString)
TEXT 路Syscall(SB),NOSPLIT,$144-32
NO_LOCAL_POINTERS
BL runtime路entersyscall(SB)
MOVW $a1+4(FP), R0 // move syscall args
MOVW $sysargs-144(SP), R1
MOVM.IA (R0), [R2-R4]
MOVM.IA [R2-R4], (R1)
MOVW trap+0(FP), R0 // syscall num
SWI $0
MOVW $0, R2
MOVW $r1+16(FP), R3
MOVM.IA [R0,R2], (R3)
CMP $-1, R0
B.EQ syscallerr
BL runtime路exitsyscall(SB)
MOVW $路emptystring+0(SB), R2
B syscallok
syscallerr:
MOVW $errbuf-128(SP), R2
MOVW $128, R3
MOVM.IA [R2,R3], (R1)
MOVW $SYS_ERRSTR, R0
SWI $0
BL runtime路exitsyscall(SB)
BL runtime路gostring(SB)
MOVW $str-140(SP), R2
syscallok:
MOVW $err+24(FP), R1
MOVM.IA (R2), [R3-R4]
MOVM.IA [R3-R4], (R1)
RET
//func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err ErrorString)
// Actually Syscall5 but the rest of the code expects it to be named Syscall6.
TEXT 路Syscall6(SB),NOSPLIT,$144-44
NO_LOCAL_POINTERS
BL runtime路entersyscall(SB)
MOVW $a1+4(FP), R0 // move syscall args
MOVW $sysargs-144(SP), R1
MOVM.IA (R0), [R2-R6]
MOVM.IA [R2-R6], (R1)
MOVW trap+0(FP), R0 // syscall num
SWI $0
MOVW $0, R2
MOVW $r1+28(FP), R3
MOVM.IA.W [R0,R2], (R3)
CMP $-1, R0
B.EQ syscall6err
BL runtime路exitsyscall(SB)
MOVW $路emptystring+0(SB), R2
B syscall6ok
syscall6err:
MOVW $errbuf-128(SP), R2
MOVW $128, R3
MOVM.IA [R2,R3], (R1)
MOVW $SYS_ERRSTR, R0
SWI $0
BL runtime路exitsyscall(SB)
BL runtime路gostring(SB)
MOVW $str-140(SP), R2
syscall6ok:
MOVW $err+36(FP), R1
MOVM.IA (R2), [R3-R4]
MOVM.IA [R3-R4], (R1)
RET
//func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr)
TEXT 路RawSyscall(SB),NOSPLIT,$12-28
MOVW $a1+4(FP), R0 // move syscall args
MOVW $sysargs-12(SP), R1
MOVM.IA (R0), [R2-R4]
MOVM.IA [R2-R4], (R1)
MOVW trap+0(FP), R0 // syscall num
SWI $0
MOVW R0, r1+16(FP)
MOVW R0, r2+20(FP)
MOVW R0, err+24(FP)
RET
//func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
// Actually RawSyscall5 but the rest of the code expects it to be named RawSyscall6.
TEXT 路RawSyscall6(SB),NOSPLIT,$20-40
MOVW $a1+4(FP), R0 // move syscall args
MOVW $sysargs-20(SP), R1
MOVM.IA (R0), [R2-R6]
MOVM.IA [R2-R6], (R1)
MOVW trap+0(FP), R0 // syscall num
SWI $0
MOVW R0, r1+28(FP)
MOVW R0, r2+32(FP)
MOVW R0, err+36(FP)
RET
//func seek(placeholder uintptr, fd int, offset int64, whence int) (newoffset int64, err string)
TEXT 路seek(SB),NOSPLIT,$20-36
NO_LOCAL_POINTERS
MOVW $newoffset_lo+20(FP), R6
MOVW R6, sysargs-20(SP) // dest for return value
MOVW $fd+4(FP), R0 // move syscall args
MOVW $sysarg1-16(SP), R1
MOVM.IA (R0), [R2-R5]
MOVM.IA [R2-R5], (R1)
MOVW $SYS_SEEK, R0 // syscall num
SWI $0
CMP $-1, R0
B.EQ seekerr
MOVW $路emptystring+0(SB), R2
B seekok
seekerr:
MOVW R0, 0(R6)
MOVW R0, 4(R6)
BL 路errstr(SB)
MOVW $ret-20(SP), R2
seekok:
MOVW $err+28(FP), R1
MOVM.IA (R2), [R3-R4]
MOVM.IA [R3-R4], (R1)
RET
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