syscall: unify unix 386 implementations

They were identical.

This will allow us to do the TODO at the top
of the file only once.

Updates #11041

Change-Id: I07aaca27ae46b66b65780082988bdc7546ed534b
Reviewed-on: https://go-review.googlesource.com/25112
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/syscall/asm_netbsd_386.s

-// 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.
-
-// TODO(rsc): Rewrite all nn(SP) references into name+(nn-8)(FP)
-// so that go vet can check that they are correct.
-
-#include "textflag.h"
-#include "funcdata.h"
-
-//
-// System call support for 386, NetBSD
-//
-
-// 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);
-// Trap # in AX, args on stack above caller pc.
-
-TEXT	·Syscall(SB),NOSPLIT,$0-28
-	CALL	runtime·entersyscall(SB)
-	MOVL	4(SP), AX	// syscall entry
-	// slide args down on top of system call number
-	LEAL		8(SP), SI
-	LEAL		4(SP), DI
-	CLD
-	MOVSL
-	MOVSL
-	MOVSL
-	INT	$0x80
-	JAE	ok
-	MOVL	$-1, 20(SP)	// r1
-	MOVL	$-1, 24(SP)	// r2
-	MOVL	AX, 28(SP)		// errno
-	CALL	runtime·exitsyscall(SB)
-	RET
-ok:
-	MOVL	AX, 20(SP)	// r1
-	MOVL	DX, 24(SP)	// r2
-	MOVL	$0, 28(SP)	// errno
-	CALL	runtime·exitsyscall(SB)
-	RET
-
-TEXT	·Syscall6(SB),NOSPLIT,$0-40
-	CALL	runtime·entersyscall(SB)
-	MOVL	4(SP), AX	// syscall entry
-	// slide args down on top of system call number
-	LEAL		8(SP), SI
-	LEAL		4(SP), DI
-	CLD
-	MOVSL
-	MOVSL
-	MOVSL
-	MOVSL
-	MOVSL
-	MOVSL
-	INT	$0x80
-	JAE	ok6
-	MOVL	$-1, 32(SP)	// r1
-	MOVL	$-1, 36(SP)	// r2
-	MOVL	AX, 40(SP)		// errno
-	CALL	runtime·exitsyscall(SB)
-	RET
-ok6:
-	MOVL	AX, 32(SP)	// r1
-	MOVL	DX, 36(SP)	// r2
-	MOVL	$0, 40(SP)	// errno
-	CALL	runtime·exitsyscall(SB)
-	RET
-
-TEXT	·Syscall9(SB),NOSPLIT,$0-52
-	CALL	runtime·entersyscall(SB)
-	MOVL	4(SP), AX	// syscall entry
-	// slide args down on top of system call number
-	LEAL		8(SP), SI
-	LEAL		4(SP), DI
-	CLD
-	MOVSL
-	MOVSL
-	MOVSL
-	MOVSL
-	MOVSL
-	MOVSL
-	MOVSL
-	MOVSL
-	MOVSL
-	INT	$0x80
-	JAE	ok9
-	MOVL	$-1, 44(SP)	// r1
-	MOVL	$-1, 48(SP)	// r2
-	MOVL	AX, 52(SP)		// errno
-	CALL	runtime·exitsyscall(SB)
-	RET
-ok9:
-	MOVL	AX, 44(SP)	// r1
-	MOVL	DX, 48(SP)	// r2
-	MOVL	$0, 52(SP)	// errno
-	CALL	runtime·exitsyscall(SB)
-	RET
-
-TEXT ·RawSyscall(SB),NOSPLIT,$0-28
-	MOVL	4(SP), AX	// syscall entry
-	// slide args down on top of system call number
-	LEAL		8(SP), SI
-	LEAL		4(SP), DI
-	CLD
-	MOVSL
-	MOVSL
-	MOVSL
-	INT	$0x80
-	JAE	ok1
-	MOVL	$-1, 20(SP)	// r1
-	MOVL	$-1, 24(SP)	// r2
-	MOVL	AX, 28(SP)		// errno
-	RET
-ok1:
-	MOVL	AX, 20(SP)	// r1
-	MOVL	DX, 24(SP)	// r2
-	MOVL	$0, 28(SP)	// errno
-	RET
-
-TEXT	·RawSyscall6(SB),NOSPLIT,$0-40
-	MOVL	4(SP), AX	// syscall entry
-	// slide args down on top of system call number
-	LEAL		8(SP), SI
-	LEAL		4(SP), DI
-	CLD
-	MOVSL
-	MOVSL
-	MOVSL
-	MOVSL
-	MOVSL
-	MOVSL
-	INT	$0x80
-	JAE	ok2
-	MOVL	$-1, 32(SP)	// r1
-	MOVL	$-1, 36(SP)	// r2
-	MOVL	AX, 40(SP)		// errno
-	RET
-ok2:
-	MOVL	AX, 32(SP)	// r1
-	MOVL	DX, 36(SP)	// r2
-	MOVL	$0, 40(SP)	// errno
-	RET

src/syscall/asm_openbsd_386.s

-// 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.
-
-// TODO(rsc): Rewrite all nn(SP) references into name+(nn-8)(FP)
-// so that go vet can check that they are correct.
-
-#include "textflag.h"
-#include "funcdata.h"
-
-//
-// System call support for 386, 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);
-// Trap # in AX, args on stack above caller pc.
-
-TEXT	·Syscall(SB),NOSPLIT,$0-28
-	CALL	runtime·entersyscall(SB)
-	MOVL	4(SP), AX	// syscall entry
-	// slide args down on top of system call number
-	LEAL		8(SP), SI
-	LEAL		4(SP), DI
-	CLD
-	MOVSL
-	MOVSL
-	MOVSL
-	INT	$0x80
-	JAE	ok
-	MOVL	$-1, 20(SP)	// r1
-	MOVL	$-1, 24(SP)	// r2
-	MOVL	AX, 28(SP)		// errno
-	CALL	runtime·exitsyscall(SB)
-	RET
-ok:
-	MOVL	AX, 20(SP)	// r1
-	MOVL	DX, 24(SP)	// r2
-	MOVL	$0, 28(SP)	// errno
-	CALL	runtime·exitsyscall(SB)
-	RET
-
-TEXT	·Syscall6(SB),NOSPLIT,$0-40
-	CALL	runtime·entersyscall(SB)
-	MOVL	4(SP), AX	// syscall entry
-	// slide args down on top of system call number
-	LEAL		8(SP), SI
-	LEAL		4(SP), DI
-	CLD
-	MOVSL
-	MOVSL
-	MOVSL
-	MOVSL
-	MOVSL
-	MOVSL
-	INT	$0x80
-	JAE	ok6
-	MOVL	$-1, 32(SP)	// r1
-	MOVL	$-1, 36(SP)	// r2
-	MOVL	AX, 40(SP)		// errno
-	CALL	runtime·exitsyscall(SB)
-	RET
-ok6:
-	MOVL	AX, 32(SP)	// r1
-	MOVL	DX, 36(SP)	// r2
-	MOVL	$0, 40(SP)	// errno
-	CALL	runtime·exitsyscall(SB)
-	RET
-
-TEXT	·Syscall9(SB),NOSPLIT,$0-52
-	CALL	runtime·entersyscall(SB)
-	MOVL	4(SP), AX	// syscall entry
-	// slide args down on top of system call number
-	LEAL		8(SP), SI
-	LEAL		4(SP), DI
-	CLD
-	MOVSL
-	MOVSL
-	MOVSL
-	MOVSL
-	MOVSL
-	MOVSL
-	MOVSL
-	MOVSL
-	MOVSL
-	INT	$0x80
-	JAE	ok9
-	MOVL	$-1, 44(SP)	// r1
-	MOVL	$-1, 48(SP)	// r2
-	MOVL	AX, 52(SP)		// errno
-	CALL	runtime·exitsyscall(SB)
-	RET
-ok9:
-	MOVL	AX, 44(SP)	// r1
-	MOVL	DX, 48(SP)	// r2
-	MOVL	$0, 52(SP)	// errno
-	CALL	runtime·exitsyscall(SB)
-	RET
-
-TEXT ·RawSyscall(SB),NOSPLIT,$0-28
-	MOVL	4(SP), AX	// syscall entry
-	// slide args down on top of system call number
-	LEAL		8(SP), SI
-	LEAL		4(SP), DI
-	CLD
-	MOVSL
-	MOVSL
-	MOVSL
-	INT	$0x80
-	JAE	ok1
-	MOVL	$-1, 20(SP)	// r1
-	MOVL	$-1, 24(SP)	// r2
-	MOVL	AX, 28(SP)		// errno
-	RET
-ok1:
-	MOVL	AX, 20(SP)	// r1
-	MOVL	DX, 24(SP)	// r2
-	MOVL	$0, 28(SP)	// errno
-	RET
-
-TEXT	·RawSyscall6(SB),NOSPLIT,$0-40
-	MOVL	4(SP), AX	// syscall entry
-	// slide args down on top of system call number
-	LEAL		8(SP), SI
-	LEAL		4(SP), DI
-	CLD
-	MOVSL
-	MOVSL
-	MOVSL
-	MOVSL
-	MOVSL
-	MOVSL
-	INT	$0x80
-	JAE	ok2
-	MOVL	$-1, 32(SP)	// r1
-	MOVL	$-1, 36(SP)	// r2
-	MOVL	AX, 40(SP)		// errno
-	RET
-ok2:
-	MOVL	AX, 32(SP)	// r1
-	MOVL	DX, 36(SP)	// r2
-	MOVL	$0, 40(SP)	// errno
-	RET

src/syscall/asm_freebsd_386.s → src/syscall/asm_unix_386.s

+// +build netbsd freebsd openbsd
+
 // 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.
@@ -9,7 +11,7 @@
 #include "funcdata.h"
 
 //
-// System call support for 386, FreeBSD
+// System call support for some 386 unixes
 //
 
 // func Syscall(trap int32, a1, a2, a3 int32) (r1, r2, err int32);