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e853ea00 UD |
1 | /* Copyright (C) 1996, 1997, 1998, 2000, 2003, 2004 |
2 | Free Software Foundation, Inc. | |
41bdb6e2 | 3 | This file is part of the GNU C Library. |
9d187dd4 | 4 | Contributed by Richard Henderson (rth@tamu.edu). |
84384f5b | 5 | |
0c5ecdc4 | 6 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
84384f5b | 10 | |
0c5ecdc4 UD |
11 | The GNU C Library is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
84384f5b | 15 | |
41bdb6e2 AJ |
16 | You should have received a copy of the GNU Lesser General Public |
17 | License along with the GNU C Library; if not, write to the Free | |
18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
19 | 02111-1307 USA. */ | |
84384f5b UD |
20 | |
21 | /* clone() is even more special than fork() as it mucks with stacks | |
22 | and invokes a function in the right context after its all over. */ | |
0c5ecdc4 | 23 | |
84384f5b UD |
24 | #include <asm/errno.h> |
25 | #include <asm/unistd.h> | |
e853ea00 | 26 | #include <tcb-offsets.h> |
0ecb606c | 27 | #include <sysdep.h> |
e853ea00 UD |
28 | |
29 | #define CLONE_VM 0x00000100 | |
30 | #define CLONE_THREAD 0x00010000 | |
84384f5b | 31 | |
b5bc52ef UD |
32 | /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg, |
33 | pid_t *ptid, void *tls, pid_t *ctid); */ | |
84384f5b UD |
34 | |
35 | .text | |
0ecb606c | 36 | ENTRY (__clone) |
84384f5b | 37 | save %sp,-96,%sp |
0ecb606c JJ |
38 | cfi_def_cfa_register(%fp) |
39 | cfi_window_save | |
40 | cfi_register(%o7, %i7) | |
0c5ecdc4 | 41 | |
84384f5b | 42 | /* sanity check arguments */ |
0ecb606c | 43 | orcc %i0,%g0,%g2 |
4194bc66 | 44 | be .Lerror |
09bf6406 | 45 | orcc %i1,%g0,%o1 |
4194bc66 | 46 | be .Lerror |
09bf6406 | 47 | mov %i2,%o0 |
0ecb606c JJ |
48 | |
49 | /* The child_stack is the top of the stack, allocate one | |
50 | whole stack frame from that as this is what the kernel | |
51 | expects. */ | |
52 | sub %o1, 96, %o1 | |
53 | mov %i3, %g3 | |
54 | mov %i2, %g4 | |
55 | ||
b5bc52ef UD |
56 | /* ptid */ |
57 | mov %i4,%o2 | |
58 | /* tls */ | |
59 | mov %i5,%o3 | |
60 | /* ctid */ | |
61 | ld [%fp+92],%o4 | |
84384f5b | 62 | |
0c5ecdc4 | 63 | /* Do the system call */ |
84384f5b UD |
64 | set __NR_clone,%g1 |
65 | ta 0x10 | |
bf47fa23 | 66 | bcs .Lerror |
4194bc66 | 67 | tst %o1 |
84384f5b | 68 | bne __thread_start |
4194bc66 | 69 | nop |
0ecb606c | 70 | jmpl %i7 + 8, %g0 |
09bf6406 | 71 | restore %o0,%g0,%o0 |
0c5ecdc4 | 72 | |
4194bc66 | 73 | .Lerror: |
84384f5b | 74 | call __errno_location |
bf47fa23 | 75 | or %g0,EINVAL,%i0 |
84384f5b | 76 | st %i0,[%o0] |
0ecb606c | 77 | jmpl %i7 + 8, %g0 |
09bf6406 | 78 | restore %g0,-1,%o0 |
0ecb606c | 79 | END(__clone) |
4194bc66 RH |
80 | |
81 | .type __thread_start,@function | |
84384f5b | 82 | __thread_start: |
0ecb606c JJ |
83 | cfi_startproc |
84 | ||
e853ea00 UD |
85 | #ifdef RESET_PID |
86 | sethi %hi(CLONE_THREAD), %l0 | |
0ecb606c | 87 | andcc %g4, %l0, %g0 |
e853ea00 | 88 | bne 1f |
0ecb606c | 89 | andcc %g4, CLONE_VM, %g0 |
e853ea00 UD |
90 | bne,a 2f |
91 | mov -1,%o0 | |
92 | set __NR_getpid,%g1 | |
93 | ta 0x10 | |
0ecb606c JJ |
94 | 2: |
95 | st %o0,[%g7 + PID] | |
e853ea00 UD |
96 | st %o0,[%g7 + TID] |
97 | 1: | |
98 | #endif | |
0ecb606c JJ |
99 | mov %g0, %fp /* terminate backtrace */ |
100 | call %g2 | |
101 | mov %g3,%o0 | |
84384f5b | 102 | call _exit,0 |
4194bc66 RH |
103 | nop |
104 | ||
0ecb606c JJ |
105 | cfi_endproc |
106 | ||
4194bc66 RH |
107 | .size __thread_start, .-__thread_start |
108 | ||
0ecb606c | 109 | weak_alias (__clone, clone) |