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asm_plan9_arm.s
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// 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 ·Syscall(SB),NOSPLIT,$144-32
NO_LOCAL_POINTERS
BL runtime·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·exitsyscall(SB)
MOVW $·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·exitsyscall(SB)
BL runtime·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 ·Syscall6(SB),NOSPLIT,$144-44
NO_LOCAL_POINTERS
BL runtime·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·exitsyscall(SB)
MOVW $·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·exitsyscall(SB)
BL runtime·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 ·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 ·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 ·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 $·emptystring+0(SB), R2
B seekok
seekerr:
MOVW R0, 0(R6)
MOVW R0, 4(R6)
BL ·errstr(SB)
MOVW $ret-20(SP), R2
seekok:
MOVW $err+28(FP), R1
MOVM.IA (R2), [R3-R4]
MOVM.IA [R3-R4], (R1)
RET