aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/go/_std_1.22/src/syscall/asm_linux_amd64.s
blob: da170c52ed92ec88ebed1ec13ea0a897d44dccac (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
// 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.

#include "textflag.h"
#include "funcdata.h"

//
// System calls for AMD64, Linux
//

#define SYS_gettimeofday 96

// func rawVforkSyscall(trap, a1, a2, a3 uintptr) (r1, err uintptr)
TEXT ·rawVforkSyscall(SB),NOSPLIT|NOFRAME,$0-48
	MOVQ	a1+8(FP), DI
	MOVQ	a2+16(FP), SI
	MOVQ	a3+24(FP), DX
	MOVQ	$0, R10
	MOVQ	$0, R8
	MOVQ	$0, R9
	MOVQ	trap+0(FP), AX	// syscall entry
	POPQ	R12 // preserve return address
	SYSCALL
	PUSHQ	R12
	CMPQ	AX, $0xfffffffffffff001
	JLS	ok2
	MOVQ	$-1, r1+32(FP)
	NEGQ	AX
	MOVQ	AX, err+40(FP)
	RET
ok2:
	MOVQ	AX, r1+32(FP)
	MOVQ	$0, err+40(FP)
	RET

// func rawSyscallNoError(trap, a1, a2, a3 uintptr) (r1, r2 uintptr)
TEXT ·rawSyscallNoError(SB),NOSPLIT,$0-48
	MOVQ	a1+8(FP), DI
	MOVQ	a2+16(FP), SI
	MOVQ	a3+24(FP), DX
	MOVQ	trap+0(FP), AX	// syscall entry
	SYSCALL
	MOVQ	AX, r1+32(FP)
	MOVQ	DX, r2+40(FP)
	RET

// func gettimeofday(tv *Timeval) (err uintptr)
TEXT ·gettimeofday(SB),NOSPLIT,$0-16
	MOVQ	tv+0(FP), DI
	MOVQ	$0, SI
	MOVQ	runtime·vdsoGettimeofdaySym(SB), AX
	TESTQ   AX, AX
	JZ fallback
	CALL	AX
ret:
	CMPQ	AX, $0xfffffffffffff001
	JLS	ok7
	NEGQ	AX
	MOVQ	AX, err+8(FP)
	RET
fallback:
	MOVL	$SYS_gettimeofday, AX
	SYSCALL
	JMP ret
ok7:
	MOVQ	$0, err+8(FP)
	RET