projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 2b778ceb | 1 | /* Copyright (C) 1999-2021 Free Software Foundation, Inc. |
| 3846ef75 UD |
2 | This file is part of the GNU C Library. |
| 3 | ||
| 4 | The GNU C Library is free software; you can redistribute it and/or | |
| 41bdb6e2 AJ |
5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either | |
| 7 | version 2.1 of the License, or (at your option) any later version. | |
| 3846ef75 UD |
8 | |
| 9 | The GNU C Library is distributed in the hope that it will be useful, | |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 41bdb6e2 | 12 | Lesser General Public License for more details. |
| 3846ef75 | 13 | |
| 41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
| 59ba27a6 | 15 | License along with the GNU C Library; if not, see |
| 5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
| 3846ef75 UD |
17 | |
| 18 | /* clone() is even more special than fork() as it mucks with stacks | |
| 19 | and invokes a function in the right context after its all over. */ | |
| 20 | ||
| 21 | #include <sysdep.h> | |
| 22 | #define _ERRNO_H 1 | |
| 23 | #include <bits/errno.h> | |
| 2da9a6a1 | 24 | #include <tcb-offsets.h> |
| 0d3b7a19 | 25 | |
| 2a051a7d UD |
26 | /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg, |
| 27 | pid_t *ptid, void *tls, pid_t *ctid); */ | |
| 3846ef75 | 28 | |
| 2da9a6a1 | 29 | .text |
| 3846ef75 UD |
30 | ENTRY(__clone) |
| 31 | /* sanity check arguments. */ | |
| 32 | tst r4, r4 | |
| 84c23a3d | 33 | bt/s 0f |
| 3846ef75 | 34 | tst r5, r5 |
| 84c23a3d RM |
35 | bf 1f |
| 36 | 0: | |
| bbd17455 | 37 | bra .Lsyscall_error |
| 84c23a3d | 38 | mov #-EINVAL,r0 |
| 3846ef75 UD |
39 | 1: |
| 40 | /* insert the args onto the new stack */ | |
| 41 | mov.l r7, @-r5 | |
| 42 | /* save the function pointer as the 0th element */ | |
| 43 | mov.l r4, @-r5 | |
| 44 | ||
| 45 | /* do the system call */ | |
| 46 | mov r6, r4 | |
| 2a051a7d UD |
47 | mov.l @r15, r6 |
| 48 | mov.l @(8,r15), r7 | |
| 49 | mov.l @(4,r15), r0 | |
| 876f9634 | 50 | mov #+SYS_ify(clone), r3 |
| 2a051a7d | 51 | trapa #0x15 |
| 3846ef75 UD |
52 | mov r0, r1 |
| 53 | mov #-12, r2 | |
| 54 | shad r2, r1 | |
| 55 | not r1, r1 // r1=0 means r0 = -1 to -4095 | |
| 56 | tst r1, r1 // i.e. error in linux | |
| bbd17455 | 57 | bf .Lclone_end |
| 9c84384c | 58 | .Lsyscall_error: |
| bbd17455 UD |
59 | SYSCALL_ERROR_HANDLER |
| 60 | .Lclone_end: | |
| 3846ef75 | 61 | tst r0, r0 |
| bbd17455 UD |
62 | bt 2f |
| 63 | .Lpseudo_end: | |
| 3846ef75 UD |
64 | rts |
| 65 | nop | |
| bbd17455 | 66 | 2: |
| 2da9a6a1 UD |
67 | /* terminate the stack frame */ |
| 68 | mov #0, r14 | |
| c579f48e | 69 | |
| 3846ef75 UD |
70 | /* thread starts */ |
| 71 | mov.l @r15, r1 | |
| 72 | jsr @r1 | |
| 73 | mov.l @(4,r15), r4 | |
| 74 | ||
| 75 | /* we are done, passing the return value through r0 */ | |
| 554e3d51 | 76 | mov r0, r4 |
| 3f823e87 AZ |
77 | mov #+SYS_ify(exit), r3 |
| 78 | trapa #0x15 | |
| 3846ef75 UD |
79 | .align 2 |
| 80 | .LG: | |
| 81 | .long _GLOBAL_OFFSET_TABLE_ | |
| 82 | .L3: | |
| 83 | .long PLTJMP(C_SYMBOL_NAME(_exit)) | |
| 84 | PSEUDO_END (__clone) | |
| 85 | ||
| 9ff72da4 | 86 | libc_hidden_def (__clone) |
| 3846ef75 | 87 | weak_alias (__clone, clone) |