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522e6ee3 | 1 | /* clone() implementation for Nios II. |
dff8da6b | 2 | Copyright (C) 2008-2024 Free Software Foundation, Inc. |
522e6ee3 | 3 | This file is part of the GNU C Library. |
522e6ee3 CLT |
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, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
522e6ee3 CLT |
18 | |
19 | /* clone() is even more special than fork() as it mucks with stacks | |
20 | and invokes a function in the right context after its all over. */ | |
21 | ||
22 | #include <sysdep.h> | |
23 | #define _ERRNO_H 1 | |
24 | #include <bits/errno.h> | |
25 | #include <tcb-offsets.h> | |
26 | ||
522e6ee3 CLT |
27 | /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg, |
28 | void *parent_tidptr, void *tls, void *child_tidptr) */ | |
29 | ||
30 | .text | |
31 | ENTRY(__clone) | |
32 | /* Sanity check arguments. */ | |
33 | movi r2, EINVAL | |
34 | /* No NULL function pointers. */ | |
35 | beq r4, zero, SYSCALL_ERROR_LABEL | |
36 | /* No NULL stack pointers. */ | |
37 | beq r5, zero, SYSCALL_ERROR_LABEL | |
38 | ||
39 | subi r5, r5, 8 /* Reserve argument save space. */ | |
40 | stw r4, 4(r5) /* Save function pointer. */ | |
41 | stw r7, 0(r5) /* Save argument pointer. */ | |
42 | ||
43 | /* Load arguments. */ | |
44 | mov r4, r6 | |
45 | ldw r6, 0(sp) | |
46 | ldw r7, 8(sp) | |
47 | ldw r8, 4(sp) | |
48 | ||
49 | /* Do the system call. */ | |
50 | movi r2, SYS_ify (clone) | |
51 | ||
52 | /* End FDE now, because in the child the unwind info will be | |
53 | wrong. */ | |
54 | cfi_endproc | |
55 | trap | |
56 | ||
57 | /* Check for errors. */ | |
58 | bne r7, zero, SYSCALL_ERROR_LABEL | |
59 | /* See if we're on the newly created thread. */ | |
60 | beq r2, zero, thread_start | |
61 | /* Successful return from the parent */ | |
62 | ret | |
63 | ||
64 | thread_start: | |
65 | cfi_startproc | |
66 | cfi_undefined (ra) | |
67 | ||
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68 | ldw r5, 4(sp) /* Function pointer. */ |
69 | ldw r4, 0(sp) /* Argument pointer. */ | |
70 | addi sp, sp, 8 | |
71 | ||
72 | /* Call the user's function. */ | |
73 | callr r5 | |
74 | ||
3f823e87 AZ |
75 | /* exit with the result. */ |
76 | movi r2, SYS_ify (exit) | |
77 | trap | |
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78 | cfi_endproc |
79 | ||
80 | cfi_startproc | |
81 | PSEUDO_END (__clone) | |
9ff72da4 | 82 | libc_hidden_def (__clone) |
522e6ee3 | 83 | weak_alias (__clone, clone) |