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cfc91acd | 1 | /* Wrapper around clone system call. PowerPC64 version. |
568035b7 | 2 | Copyright (C) 1997-2013 Free Software Foundation, Inc. |
cfc91acd RM |
3 | This file is part of the GNU C Library. |
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 | |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
cfc91acd RM |
18 | |
19 | #include <sysdep.h> | |
20 | #define _ERRNO_H 1 | |
21 | #include <bits/errno.h> | |
cfc91acd | 22 | |
1f9d7c27 UD |
23 | #define CLONE_VM 0x00000100 |
24 | #define CLONE_THREAD 0x00010000 | |
25 | ||
cfc91acd RM |
26 | /* This is the only really unusual system call in PPC linux, but not |
27 | because of any weirdness in the system call itself; because of | |
28 | all the freaky stuff we have to do to make the call useful. */ | |
29 | ||
30 | /* int [r3] clone(int (*fn)(void *arg) [r3], void *child_stack [r4], | |
4fba8a3b RM |
31 | int flags [r5], void *arg [r6], void *parent_tid [r7], |
32 | void *tls [r8], void *child_tid [r9]); */ | |
cfc91acd | 33 | |
2d67d91a | 34 | ENTRY (__clone) |
865d953f | 35 | CALL_MCOUNT 7 |
cfc91acd RM |
36 | |
37 | /* Check for child_stack == NULL || fn == NULL. */ | |
38 | cmpdi cr0,r4,0 | |
a2eae4cc | 39 | cmpdi cr1,r3,0 |
cfc91acd RM |
40 | cror cr0*4+eq,cr1*4+eq,cr0*4+eq |
41 | beq- cr0,L(badargs) | |
42 | ||
8b8a692c | 43 | /* Save some regs in the "red zone". */ |
1f9d7c27 | 44 | #ifdef RESET_PID |
8b8a692c | 45 | std r29,-24(r1) |
1f9d7c27 | 46 | #endif |
8b8a692c UW |
47 | std r30,-16(r1) |
48 | std r31,-8(r1) | |
bebff237 | 49 | #ifdef RESET_PID |
8b8a692c | 50 | cfi_offset(r29,-24) |
bebff237 | 51 | #endif |
8b8a692c UW |
52 | cfi_offset(r30,-16) |
53 | cfi_offset(r31,-8) | |
cfc91acd RM |
54 | |
55 | /* Set up stack frame for child. */ | |
56 | clrrdi r4,r4,4 | |
57 | li r0,0 | |
8b8a692c | 58 | stdu r0,-FRAME_MIN_SIZE_PARM(r4) |
cfc91acd RM |
59 | |
60 | /* Save fn, args, stack across syscall. */ | |
bebff237 | 61 | mr r30,r3 /* Function in r30. */ |
1f9d7c27 | 62 | #ifdef RESET_PID |
bebff237 | 63 | mr r29,r5 /* Flags in r29. */ |
1f9d7c27 | 64 | #endif |
cfc91acd RM |
65 | mr r31,r6 /* Argument in r31. */ |
66 | ||
bebff237 AM |
67 | /* 'flags' argument is first parameter to clone syscall. |
68 | Second is the stack pointer, already in r4. */ | |
cfc91acd | 69 | mr r3,r5 |
4fba8a3b RM |
70 | /* Move the parent_tid, child_tid and tls arguments. */ |
71 | mr r5,r7 | |
72 | mr r6,r8 | |
73 | mr r7,r9 | |
cfc91acd | 74 | |
97d901a6 RM |
75 | /* End FDE now, because in the child the unwind info will be |
76 | wrong. */ | |
77 | cfi_endproc | |
78 | ||
cfc91acd RM |
79 | /* Do the call. */ |
80 | DO_CALL(SYS_ify(clone)) | |
81 | ||
82 | /* Check for child process. */ | |
83 | cmpdi cr1,r3,0 | |
84 | crandc cr1*4+eq,cr1*4+eq,cr0*4+so | |
85 | bne- cr1,L(parent) /* The '-' is to minimise the race. */ | |
86 | ||
1f9d7c27 | 87 | #ifdef RESET_PID |
bebff237 | 88 | andis. r0,r29,CLONE_THREAD>>16 |
a2eae4cc | 89 | bne+ cr0,L(oldpid) |
bebff237 | 90 | andi. r0,r29,CLONE_VM |
1f9d7c27 | 91 | li r3,-1 |
a2eae4cc | 92 | bne- cr0,L(nomoregetpid) |
1f9d7c27 UD |
93 | DO_CALL(SYS_ify(getpid)) |
94 | L(nomoregetpid): | |
95 | stw r3,TID(r13) | |
96 | stw r3,PID(r13) | |
97 | L(oldpid): | |
98 | #endif | |
99 | ||
8b8a692c | 100 | std r2,FRAME_TOC_SAVE(r1) |
cfc91acd | 101 | /* Call procedure. */ |
d31beafa | 102 | PPC64_LOAD_FUNCPTR r30 |
cfc91acd RM |
103 | mr r3,r31 |
104 | bctrl | |
8b8a692c | 105 | ld r2,FRAME_TOC_SAVE(r1) |
cfc91acd | 106 | /* Call _exit with result from procedure. */ |
7062ca8f UD |
107 | #ifdef SHARED |
108 | b JUMPTARGET(__GI__exit) | |
109 | #else | |
cfc91acd | 110 | b JUMPTARGET(_exit) |
bebff237 AM |
111 | /* We won't ever get here but provide a nop so that the linker |
112 | will insert a toc adjusting stub if necessary. */ | |
113 | nop | |
7062ca8f | 114 | #endif |
cfc91acd | 115 | |
bebff237 AM |
116 | L(badargs): |
117 | cfi_startproc | |
118 | li r3,EINVAL | |
119 | TAIL_CALL_SYSCALL_ERROR | |
120 | ||
cfc91acd RM |
121 | L(parent): |
122 | /* Parent. Restore registers & return. */ | |
1f9d7c27 | 123 | #ifdef RESET_PID |
8b8a692c | 124 | cfi_offset(r29,-24) |
1f9d7c27 | 125 | #endif |
8b8a692c UW |
126 | cfi_offset(r30,-16) |
127 | cfi_offset(r31,-8) | |
bebff237 | 128 | #ifdef RESET_PID |
8b8a692c | 129 | ld r29,-24(r1) |
bebff237 | 130 | #endif |
8b8a692c UW |
131 | ld r30,-16(r1) |
132 | ld r31,-8(r1) | |
bebff237 AM |
133 | #ifdef RESET_PID |
134 | cfi_restore(r29) | |
135 | #endif | |
136 | cfi_restore(r30) | |
137 | cfi_restore(r31) | |
138 | PSEUDO_RET | |
97d901a6 | 139 | |
2d67d91a | 140 | END (__clone) |
cfc91acd | 141 | |
2d67d91a | 142 | weak_alias (__clone, clone) |