1 // Copyright 2022 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
4 5 #include "textflag.h"
6 7 // See ../sys_linux_386.s for the reason why we always use int 0x80
8 // instead of the glibc-specific "CALL 0x10(GS)".
9 #define INVOKE_SYSCALL INT $0x80
10 11 // func Syscall6(num, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, errno uintptr)
12 //
13 // Syscall # in AX, args in BX CX DX SI DI BP, return in AX
14 TEXT ·Syscall6(SB),NOSPLIT,$0-40
15 MOVL num+0(FP), AX // syscall entry
16 MOVL a1+4(FP), BX
17 MOVL a2+8(FP), CX
18 MOVL a3+12(FP), DX
19 MOVL a4+16(FP), SI
20 MOVL a5+20(FP), DI
21 MOVL a6+24(FP), BP
22 INVOKE_SYSCALL
23 CMPL AX, $0xfffff001
24 JLS ok
25 MOVL $-1, r1+28(FP)
26 MOVL $0, r2+32(FP)
27 NEGL AX
28 MOVL AX, errno+36(FP)
29 RET
30 ok:
31 MOVL AX, r1+28(FP)
32 MOVL DX, r2+32(FP)
33 MOVL $0, errno+36(FP)
34 RET
35