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asm_unix_386.s
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// 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.
//go:build freebsd || netbsd
#include "textflag.h"
#include "funcdata.h"
//
// System call support for some 386 unixes
//
// 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 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
MOVL $-1, r1+16(FP) // r1
MOVL $-1, r2+20(FP) // r2
MOVL AX, err+24(FP) // errno
CALL runtime·exitsyscall(SB)
RET
ok:
MOVL AX, r1+16(FP) // r1
MOVL DX, r2+20(FP) // r2
MOVL $0, err+24(FP) // errno
CALL runtime·exitsyscall(SB)
RET
TEXT ·Syscall6(SB),NOSPLIT,$0-40
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
MOVSL
MOVSL
MOVSL
INT $0x80
JAE ok6
MOVL $-1, r1+28(FP) // r1
MOVL $-1, r2+32(FP) // r2
MOVL AX, err+36(FP) // errno
CALL runtime·exitsyscall(SB)
RET
ok6:
MOVL AX, r1+28(FP) // r1
MOVL DX, r2+32(FP) // r2
MOVL $0, err+36(FP) // errno
CALL runtime·exitsyscall(SB)
RET
TEXT ·Syscall9(SB),NOSPLIT,$0-52
CALL runtime·entersyscall(SB)
MOVL num+0(FP), AX // syscall entry
// slide args down on top of system call number
LEAL a1+4(FP), SI
LEAL num+0(FP), DI
CLD
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
MOVSL
INT $0x80
JAE ok9
MOVL $-1, r1+40(FP) // r1
MOVL $-1, r2+44(FP) // r2
MOVL AX, err+48(FP) // errno
CALL runtime·exitsyscall(SB)
RET
ok9:
MOVL AX, r1+40(FP) // r1
MOVL DX, r2+44(FP) // r2
MOVL $0, err+48(FP) // errno
CALL runtime·exitsyscall(SB)
RET
TEXT ·RawSyscall(SB),NOSPLIT,$0-28
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 ok1
MOVL $-1, r1+16(FP) // r1
MOVL $-1, r2+20(FP) // r2
MOVL AX, err+24(FP) // errno
RET
ok1:
MOVL AX, r1+16(FP) // r1
MOVL DX, r2+20(FP) // r2
MOVL $0, err+24(FP) // errno
RET
TEXT ·RawSyscall6(SB),NOSPLIT,$0-40
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
MOVSL
MOVSL
MOVSL
INT $0x80
JAE ok2
MOVL $-1, r1+28(FP) // r1
MOVL $-1, r2+32(FP) // r2
MOVL AX, err+36(FP) // errno
RET
ok2:
MOVL AX, r1+28(FP) // r1
MOVL DX, r2+32(FP) // r2
MOVL $0, err+36(FP) // errno
RET