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1/* Copyright (C) 1996, 1997, 2000, 2003 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ralf Baechle <ralf@linux-mips.org>, 1996.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
19
20/* clone() is even more special than fork() as it mucks with stacks
21 and invokes a function in the right context after its all over. */
22
23#include <sys/asm.h>
24#include <sysdep.h>
25#define _ERRNO_H 1
26#include <bits/errno.h>
27
28/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg) */
29
30 .text
31LOCALSZ= 1
32FRAMESZ= (((NARGSAVE+LOCALSZ)*SZREG)+ALSZ)&ALMASK
33GPOFF= FRAMESZ-(1*SZREG)
34NESTED(__clone,4*SZREG,sp)
35#ifdef __PIC__
36 SETUP_GP
37#endif
38 PTR_SUBU sp, FRAMESZ
39 SETUP_GP64 (GPOFF, __clone)
40#ifdef __PIC__
41 SAVE_GP (GPOFF)
42#endif
43#ifdef PROF
44 .set noat
45 move $1,ra
46 jal _mcount
47 .set at
48#endif
49
50
51 /* Sanity check arguments. */
52 li v0,EINVAL
53 beqz a0,L(error) /* No NULL function pointers. */
54 beqz a1,L(error) /* No NULL stack pointers. */
55
56 PTR_SUBU a1,32 /* Reserve argument save space. */
57 PTR_S a0,0(a1) /* Save function pointer. */
58 PTR_S a3,PTRSIZE(a1) /* Save argument pointer. */
59
60
61 /* Do the system call */
62 move a0,a2
63 li v0,__NR_clone
64 syscall
65
66 bnez a3,L(error)
67 beqz v0,L(thread_start)
68
69 /* Successful return from the parent */
70 RESTORE_GP64
71 PTR_ADDU sp, FRAMESZ
72 ret
73
74 /* Something bad happened -- no child created */
75L(error):
76#ifdef __PIC__
77 PTR_LA t9,__syscall_error
78 RESTORE_GP64
79 PTR_ADDU sp, FRAMESZ
80 jr t9
81#else
82 RESTORE_GP64
83 PTR_ADDU sp, FRAMESZ
84 j __syscall_error
85#endif
86 END(__clone)
87
88/* Load up the arguments to the function. Put this block of code in
89 its own function so that we can terminate the stack trace with our
90 debug info. */
91
92ENTRY(__thread_start)
93L(thread_start):
94 /* cp is already loaded. */
95 SAVE_GP (GPOFF)
96 /* The stackframe has been created on entry of clone(). */
97 /* Restore the arg for user's function. */
98 PTR_L t9,0(sp) /* Function pointer. */
99 PTR_L a0,PTRSIZE(sp) /* Argument pointer. */
100
101 /* Call the user's function. */
102 jal t9
103
104 /* Call _exit rather than doing it inline for breakpoint purposes. */
105 move a0,v0
106#ifdef __PIC__
107 PTR_LA t9,_exit
108 jalr t9
109#else
110 jal _exit
111#endif
112 END(__thread_start)
113
114weak_alias(__clone, clone)
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