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https://github.com/golang/go
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87103a1ab7
This prevents a fatal "missing stackmap" error if garbage collection occurs during exit. Also annotate argument sizes for "go vet". Change-Id: I2473e0ef6aef8f26d0bbeaee9bd8f8a52eaaf941 Reviewed-on: https://go-review.googlesource.com/20476 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
100 lines
2.7 KiB
ArmAsm
100 lines
2.7 KiB
ArmAsm
// 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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#include "textflag.h"
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#include "funcdata.h"
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#define SYS_SEEK 39 /* from zsysnum_plan9.go */
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// System call support for plan9 on arm
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TEXT sysresult<>(SB),NOSPLIT,$12
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MOVW $runtime·emptystring+0(SB), R2
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CMP $-1, R0
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B.NE ok
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MOVW R1, save-4(SP)
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BL runtime·errstr(SB)
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MOVW save-4(SP), R1
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MOVW $err-12(SP), R2
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ok:
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MOVM.IA (R2), [R3-R4]
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MOVM.IA [R3-R4], (R1)
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RET
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//func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err ErrorString)
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TEXT ·Syscall(SB),NOSPLIT,$0-32
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BL runtime·entersyscall(SB)
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MOVW trap+0(FP), R0 // syscall num
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MOVM.IA.W (R13),[R1-R2] // pop LR and caller's LR
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SWI 0
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MOVM.DB.W [R1-R2],(R13) // push LR and caller's LR
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MOVW $0, R2
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MOVW $r1+16(FP), R1
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MOVM.IA.W [R0,R2], (R1)
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BL sysresult<>(SB)
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BL runtime·exitsyscall(SB)
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RET
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//func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err ErrorString)
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// Actually Syscall5 but the rest of the code expects it to be named Syscall6.
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TEXT ·Syscall6(SB),NOSPLIT,$0-44
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BL runtime·entersyscall(SB)
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MOVW trap+0(FP), R0 // syscall num
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MOVM.IA.W (R13),[R1-R2] // pop LR and caller's LR
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SWI 0
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MOVM.DB.W [R1-R2],(R13) // push LR and caller's LR
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MOVW $0, R1
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MOVW $r1+28(FP), R1
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MOVM.IA.W [R0,R2], (R1)
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BL sysresult<>(SB)
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BL runtime·exitsyscall(SB)
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RET
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//func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr)
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TEXT ·RawSyscall(SB),NOSPLIT,$0-28
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MOVW trap+0(FP), R0 // syscall num
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MOVM.IA.W (R13),[R1] // pop caller's LR
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SWI 0
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MOVM.DB.W [R1],(R13) // push caller's LR
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MOVW R0, r1+16(FP)
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MOVW R0, r2+20(FP)
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MOVW R0, err+24(FP)
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RET
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//func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr)
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// Actually RawSyscall5 but the rest of the code expects it to be named RawSyscall6.
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TEXT ·RawSyscall6(SB),NOSPLIT,$0-40
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MOVW trap+0(FP), R0 // syscall num
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MOVM.IA.W (R13),[R1] // pop caller's LR
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SWI 0
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MOVM.DB.W [R1],(R13) // push caller's LR
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MOVW R0, r1+28(FP)
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MOVW R0, r2+32(FP)
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MOVW R0, err+36(FP)
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RET
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//func seek(placeholder uintptr, fd int, offset int64, whence int) (newoffset int64, err string)
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TEXT ·seek(SB),NOSPLIT,$0-36
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MOVW $newoffset_lo+20(FP), R5
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MOVW R5, placeholder+0(FP) //placeholder = dest for return value
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MOVW $SYS_SEEK, R0 // syscall num
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MOVM.IA.W (R13),[R1] // pop LR
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SWI 0
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MOVM.DB.W [R1],(R13) // push LR
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CMP $-1, R0
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MOVW.EQ R0, 0(R5)
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MOVW.EQ R0, 4(R5)
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MOVW $err+28(FP), R1
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BL sysresult<>(SB)
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RET
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//func exit(code int)
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// Import runtime·exit for cleanly exiting.
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TEXT ·exit(SB),NOSPLIT,$4-4
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NO_LOCAL_POINTERS
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MOVW code+0(FP), R0
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MOVW R0, e-4(SP)
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BL runtime·exit(SB)
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RET
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