about summary refs log tree commit diff
path: root/sysdeps/unix/sysv/linux/sparc64/clone.S
blob: fe38bf4ab7e432aa7ca39af4220cacc8fdb42d53 (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
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
/* Copyright (C) 1997 Free Software Foundation, Inc.
   Contributed by Richard Henderson (rth@tamu.edu).

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

/* clone() is even more special than fork() as it mucks with stacks
   and invokes a function in the right context after its all over.  */

#include <asm/errno.h>
#include <asm/unistd.h>

/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */

	.text
	.align	4
	.globl	__libc_clone
	.type	__libc_clone,@function
	.weak	clone
	__clone = __libc_clone
	clone   = __libc_clone

__libc_clone:
	save	%sp,-160,%sp

	/* sanity check arguments */
	brz,pn	%i0, 99f
	 mov	%i0, %l0		/* save fn */
	brz,pn	%i1, 99f
	 mov	%i3, %l3		/* save arg */

	/* Do the system call */
	mov	%i1, %o1
	mov	%i2, %o0
	set	__NR_clone, %g1
	ta	0x11
	bcs,pn	%xcc, 99f
	 nop
	brnz	%o0, __thread_start
	 mov	%o0, %i0
	ret
	 restore
99:
#ifdef PIC
	rd	%pc, %g1
	sethi	%hi(_GLOBAL_OFFSET_TABLE_-(99b-.)), %l7
	or	%l7, %lo(_GLOBAL_OFFSET_TABLE_-(99b-.)), %l7
	add	%l7, %g1, %l7
	set	EINVAL, %i0
	sethi	%hi(errno), %g2
	or	%g2, %lo(errno), %g2
	st	%i0, [%l7+%g2]
#else
	sethi	%hi(errno), %g2
	add	%g2, %g4, %g2
	set	EINVAL, %i0
	st	%i0, [%g2+%lo(errno)]
#endif
#ifdef _LIBC_REENTRANT
	call	__errno_location
	 nop
	st	%i0, [%o0]
#endif
	mov	-1,%i0
	ret
	 restore
	.size __libc_clone,.-__libc_clone

	.type __thread_start,@function
__thread_start:
	mov	%g0, %fp	/* terminate backtrace */
	sub	%sp, 6*8, %sp	/* provide arg storage */
	call	%l0
	 mov	%l3,%o0
	call	_exit,0
	 nop
	.size __thread_start,.-__thread_start