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// Copyright 2013 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"
//
// System call support for ARM, OpenBSD
//
// func Syscall(trap int32, a1, a2, a3 int32) (r1, r2, err int32);
// func Syscall6(trap int32, a1, a2, a3, a4, a5, a6 int32) (r1, r2, err int32);
// func Syscall9(trap int32, a1, a2, a3, a4, a5, a6, a7, a8, a9 int64) (r1, r2, err int32)
// func RawSyscall(trap int32, a1, a2, a3 int32) (r1, r2, err int32);
// func RawSyscall6(trap int32, a1, a2, a3, a4, a5, a6 int32) (r1, r2, err int32);
// See comment in runtime/sys_openbsd_arm.s re this construction.
#define NOOP MOVW R0, R0
#define INVOKE_SYSCALL \
SWI $0; \
NOOP; \
NOOP
TEXT ·Syscall(SB),NOSPLIT,$0-28
BL runtime·entersyscall(SB)
MOVW trap+0(FP), R12 // syscall number
MOVW a1+4(FP), R0 // arg 1
MOVW a2+8(FP), R1 // arg 2
MOVW a3+12(FP), R2 // arg 3
INVOKE_SYSCALL
MOVW $0, R2
BCS error
MOVW R0, r1+16(FP) // ret 1
MOVW R1, r2+20(FP) // ret 2
MOVW R2, err+24(FP) // err
BL runtime·exitsyscall(SB)
RET
error:
MOVW $-1, R3
MOVW R3, r1+16(FP) // ret 1
MOVW R2, r2+20(FP) // ret 2
MOVW R0, err+24(FP) // err
BL runtime·exitsyscall(SB)
RET
TEXT ·Syscall6(SB),NOSPLIT,$0-40
BL runtime·entersyscall(SB)
MOVW trap+0(FP), R12 // syscall number
MOVW a1+4(FP), R0 // arg 1
MOVW a2+8(FP), R1 // arg 2
MOVW a3+12(FP), R2 // arg 3
MOVW a4+16(FP), R3 // arg 4
MOVW R13, R4
MOVW $a5+20(FP), R13 // arg 5 to arg 6 are passed on stack
INVOKE_SYSCALL
MOVW R4, R13
MOVW $0, R2
BCS error6
MOVW R0, r1+28(FP) // ret 1
MOVW R1, r2+32(FP) // ret 2
MOVW R2, err+36(FP) // err
BL runtime·exitsyscall(SB)
RET
error6:
MOVW $-1, R3
MOVW R3, r1+28(FP) // ret 1
MOVW R2, r2+32(FP) // ret 2
MOVW R0, err+36(FP) // err
BL runtime·exitsyscall(SB)
RET
TEXT ·Syscall9(SB),NOSPLIT,$0-52
BL runtime·entersyscall(SB)
MOVW num+0(FP), R12 // syscall number
MOVW a1+4(FP), R0 // arg 1
MOVW a2+8(FP), R1 // arg 2
MOVW a3+12(FP), R2 // arg 3
MOVW a4+16(FP), R3 // arg 4
MOVW R13, R4
MOVW $a5+20(FP), R13 // arg 5 to arg 9 are passed on stack
INVOKE_SYSCALL
MOVW R4, R13
MOVW $0, R2
BCS error9
MOVW R0, r1+40(FP) // ret 1
MOVW R1, r2+44(FP) // ret 2
MOVW R2, err+48(FP) // err
BL runtime·exitsyscall(SB)
RET
error9:
MOVW $-1, R3
MOVW R3, r1+40(FP) // ret 1
MOVW R2, r2+44(FP) // ret 2
MOVW R0, err+48(FP) // err
BL runtime·exitsyscall(SB)
RET
TEXT ·RawSyscall(SB),NOSPLIT,$0-28
MOVW trap+0(FP), R12 // syscall number
MOVW a1+4(FP), R0 // arg 1
MOVW a2+8(FP), R1 // arg 2
MOVW a3+12(FP), R2 // arg 3
INVOKE_SYSCALL
MOVW $0, R2
BCS errorr
MOVW R0, r1+16(FP) // ret 1
MOVW R1, r2+20(FP) // ret 2
MOVW R2, err+24(FP) // err
RET
errorr:
MOVW $-1, R3
MOVW R3, r1+16(FP) // ret 1
MOVW R2, r2+20(FP) // ret 2
MOVW R0, err+24(FP) // err
RET
TEXT ·RawSyscall6(SB),NOSPLIT,$0-40
MOVW trap+0(FP), R12 // syscall number
MOVW a1+4(FP), R0 // arg 1
MOVW a2+8(FP), R1 // arg 2
MOVW a3+12(FP), R2 // arg 3
MOVW a4+16(FP), R3 // arg 4
MOVW R13, R4
MOVW $a5+20(FP), R13 // arg 5 to arg 6 are passed on stack
INVOKE_SYSCALL
MOVW R4, R13
MOVW $0, R2
BCS errorr6
MOVW R0, r1+28(FP) // ret 1
MOVW R1, r2+32(FP) // ret 2
MOVW R2, err+36(FP) // err
RET
errorr6:
MOVW $-1, R3
MOVW R3, r1+28(FP) // ret 1
MOVW R2, r2+32(FP) // ret 2
MOVW R0, err+36(FP) // err
RET
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