src/syscall/asm_openbsd_arm.s

// 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