// nameless linkname to export to assembly here and in x/sys. Additionally,
// entersyscall fetches the caller PC and SP and thus can't have a wrapper
// inbetween.

//go:linkname runtime_entersyscall runtime.entersyscall
func runtime_entersyscall()

//go:linkname runtime_exitsyscall runtime.exitsyscall
func runtime_exitsyscall()

// N.B. For the Syscall functions below:
//

//
// System call support for AMD64, Darwin
//

// Trap # in AX, args in DI SI DX, return in AX DX

// func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno);
TEXT	·Syscall(SB),NOSPLIT,$0-56
	CALL	runtime·entersyscall<ABIInternal>(SB)
	MOVQ	a1+8(FP), DI
	MOVQ	a2+16(FP), SI
	MOVQ	a3+24(FP), DX
	MOVQ	trap+0(FP), AX	// syscall entry
	ADDQ	$0x2000000, AX
	SYSCALL
	JCC	ok
	MOVQ	$-1, r1+32(FP)
	MOVQ	$0, r2+40(FP)

// 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)

TEXT	·Syscall(SB),NOSPLIT,$0-28
	BL runtime·entersyscall(SB)
	MOVW trap+0(FP), R0 // sigcall num
	MOVW a1+4(FP), R1 // a1
	MOVW a2+8(FP), R2 // a2
	MOVW a3+12(FP), R3 // a3
	SWI $0 // syscall
	MOVW $0, R2
	BCS error
	MOVW R0, r1+16(FP) // r1

// func Syscall6(trap int32, a1, a2, a3, a4, a5, a6 int32) (r1, r2, err int32);
// Trap # in AX, args on stack above caller pc.

TEXT	·Syscall(SB),NOSPLIT,$0-28
	CALL	runtime·entersyscall(SB)
	MOVL	trap+0(FP), AX	// syscall entry
	// slide args down on top of system call number
	LEAL		a1+4(FP), SI
	LEAL		trap+0(FP), DI
	CLD
	MOVSL
	MOVSL
	MOVSL
	INT	$0x80
	JAE	ok

// func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, errno uintptr);
// func Syscall9(trap, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2, errno uintptr)

TEXT	·Syscall(SB),NOSPLIT,$0-28
	BL runtime·entersyscall(SB)
	MOVW trap+0(FP), R7 // syscall number
	MOVW a1+4(FP), R0 // a1
	MOVW a2+8(FP), R1 // a2
	MOVW a3+12(FP), R2 // a3
	SWI $0 // syscall
	MOVW $0, R2
	BCS error
	MOVW R0, r1+16(FP) // r1

#include "textflag.h"

//
// System call support for ARM64, FreeBSD
//

#define SYS_syscall	0

// func Syscall(trap uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr)
TEXT ·Syscall(SB),NOSPLIT,$0-56
	BL	runtime·entersyscall<ABIInternal>(SB)
	MOVD	trap+0(FP), R8	// syscall entry
	MOVD	a1+8(FP), R0
	MOVD	a2+16(FP), R1
	MOVD	a3+24(FP), R2
	SVC	$SYS_syscall
	BCC	ok
	MOVD	$-1, R1
	MOVD	R1, r1+32(FP)
	MOVD	ZR, r2+40(FP)

// license that can be found in the LICENSE file.

#include "textflag.h"

// func Syscall(trap int64, a1, a2, a3 int64) (r1, r2, err int64);
TEXT ·Syscall(SB),NOSPLIT,$0-56
	JAL	runtime·entersyscall(SB)
	MOVV	a1+8(FP), R4
	MOVV	a2+16(FP), R5
	MOVV	a3+24(FP), R6
	MOVV	R0, R7
	MOVV	R0, R8
	MOVV	R0, R9
	MOVV	trap+0(FP), R2	// syscall entry
	SYSCALL
	BEQ	R7, ok
	MOVV	$-1, R1

#include "textflag.h"

//
// System call support for ARM64, Darwin
//

// func Syscall(trap uintptr, a1, a2, a3 uintptr) (r1, r2, err uintptr)
TEXT	·Syscall(SB),NOSPLIT,$0-56
	BL	runtime·entersyscall<ABIInternal>(SB)
	MOVD	trap+0(FP), R16
	MOVD	a1+8(FP), R0
	MOVD	a2+16(FP), R1
	MOVD	a3+24(FP), R2
	SVC	$0x80
	BCC	ok
	MOVD	$-1, R1
	MOVD	R1, r1+32(FP)	// r1
	MOVD	ZR, r2+40(FP)	// r2

// func Syscall6(trap int64, a1, a2, a3, a4, a5, a6 int64) (r1, r2, err int64)
// Trap # in AX, args in DI SI DX, return in AX DX

TEXT	·Syscall(SB),NOSPLIT,$0-56
	CALL	runtime·entersyscall<ABIInternal>(SB)
	MOVQ	trap+0(FP), AX	// syscall entry
	MOVQ	a1+8(FP), DI
	MOVQ	a2+16(FP), SI
	MOVQ	a3+24(FP), DX
	SYSCALL
	JCC	ok
	MOVQ	$-1, r1+32(FP)	// r1
	MOVQ	$0, r2+40(FP)	// r2

#include "textflag.h"

//
// System calls for riscv64, FreeBSD
//

// func Syscall(trap int64, a1, a2, a3 int64) (r1, r2, err int64)
TEXT ·Syscall(SB),NOSPLIT,$0-56
	CALL	runtime·entersyscall(SB)
	MOV	a1+8(FP), A0
	MOV	a2+16(FP), A1
	MOV	a3+24(FP), A2
	MOV	trap+0(FP), T0	// syscall entry
	ECALL
	BNE	T0, ZERO, err
	MOV	A0, r1+32(FP)	// r1
	MOV	A1, r2+40(FP)	// r2