1// Copyright 2009 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#include "funcdata.h"
7
8//
9// System calls for 386, Linux
10//
11
12// See ../runtime/sys_linux_386.s for the reason why we always use int 0x80
13// instead of the glibc-specific "CALL 0x10(GS)".
14#define INVOKE_SYSCALL	INT	$0x80
15
16// func rawVforkSyscall(trap, a1, a2, a3 uintptr) (r1, err uintptr)
17TEXT ·rawVforkSyscall(SB),NOSPLIT|NOFRAME,$0-24
18	MOVL	trap+0(FP), AX	// syscall entry
19	MOVL	a1+4(FP), BX
20	MOVL	a2+8(FP), CX
21	MOVL	a3+12(FP), DX
22	POPL	SI // preserve return address
23	INVOKE_SYSCALL
24	PUSHL	SI
25	CMPL	AX, $0xfffff001
26	JLS	ok
27	MOVL	$-1, r1+16(FP)
28	NEGL	AX
29	MOVL	AX, err+20(FP)
30	RET
31ok:
32	MOVL	AX, r1+16(FP)
33	MOVL	$0, err+20(FP)
34	RET
35
36// func rawSyscallNoError(trap uintptr, a1, a2, a3 uintptr) (r1, r2 uintptr);
37TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-24
38	MOVL	trap+0(FP), AX	// syscall entry
39	MOVL	a1+4(FP), BX
40	MOVL	a2+8(FP), CX
41	MOVL	a3+12(FP), DX
42	MOVL	$0, SI
43	MOVL	$0, DI
44	INVOKE_SYSCALL
45	MOVL	AX, r1+16(FP)
46	MOVL	DX, r2+20(FP)
47	RET
48
49#define SYS_SOCKETCALL 102	/* from zsysnum_linux_386.go */
50
51// func socketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, err int)
52// Kernel interface gets call sub-number and pointer to a0.
53TEXT ·socketcall(SB),NOSPLIT,$0-36
54	CALL	runtime·entersyscall(SB)
55	MOVL	$SYS_SOCKETCALL, AX	// syscall entry
56	MOVL	call+0(FP), BX	// socket call number
57	LEAL	a0+4(FP), CX	// pointer to call arguments
58	MOVL	$0, DX
59	MOVL	$0, SI
60	MOVL	$0, DI
61	INVOKE_SYSCALL
62	CMPL	AX, $0xfffff001
63	JLS	oksock
64	MOVL	$-1, n+28(FP)
65	NEGL	AX
66	MOVL	AX, err+32(FP)
67	CALL	runtime·exitsyscall(SB)
68	RET
69oksock:
70	MOVL	AX, n+28(FP)
71	MOVL	$0, err+32(FP)
72	CALL	runtime·exitsyscall(SB)
73	RET
74
75// func rawsocketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, err int)
76// Kernel interface gets call sub-number and pointer to a0.
77TEXT ·rawsocketcall(SB),NOSPLIT,$0-36
78	MOVL	$SYS_SOCKETCALL, AX	// syscall entry
79	MOVL	call+0(FP), BX	// socket call number
80	LEAL		a0+4(FP), CX	// pointer to call arguments
81	MOVL	$0, DX
82	MOVL	$0, SI
83	MOVL	$0, DI
84	INVOKE_SYSCALL
85	CMPL	AX, $0xfffff001
86	JLS	oksock1
87	MOVL	$-1, n+28(FP)
88	NEGL	AX
89	MOVL	AX, err+32(FP)
90	RET
91oksock1:
92	MOVL	AX, n+28(FP)
93	MOVL	$0, err+32(FP)
94	RET
95
96#define SYS__LLSEEK 140	/* from zsysnum_linux_386.go */
97// func Seek(fd int, offset int64, whence int) (newoffset int64, err int)
98// Implemented in assembly to avoid allocation when
99// taking the address of the return value newoffset.
100// Underlying system call is
101//	llseek(int fd, int offhi, int offlo, int64 *result, int whence)
102TEXT ·seek(SB),NOSPLIT,$0-28
103	CALL	runtime·entersyscall(SB)
104	MOVL	$SYS__LLSEEK, AX	// syscall entry
105	MOVL	fd+0(FP), BX
106	MOVL	offset_hi+8(FP), CX
107	MOVL	offset_lo+4(FP), DX
108	LEAL	newoffset_lo+16(FP), SI	// result pointer
109	MOVL	whence+12(FP), DI
110	INVOKE_SYSCALL
111	CMPL	AX, $0xfffff001
112	JLS	okseek
113	MOVL	$-1, newoffset_lo+16(FP)
114	MOVL	$-1, newoffset_hi+20(FP)
115	NEGL	AX
116	MOVL	AX, err+24(FP)
117	CALL	runtime·exitsyscall(SB)
118	RET
119okseek:
120	// system call filled in newoffset already
121	MOVL	$0, err+24(FP)
122	CALL	runtime·exitsyscall(SB)
123	RET
124