projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 522e6ee3 | 1 | /* clone() implementation for Nios II. |
| 04277e02 | 2 | Copyright (C) 2008-2019 Free Software Foundation, Inc. |
| 522e6ee3 CLT |
3 | This file is part of the GNU C Library. |
| 4 | Contributed by Andrew Jenner <andrew@codesourcery.com>, 2008. | |
| 5 | ||
| 6 | The GNU C Library is free software; you can redistribute it and/or | |
| 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. | |
| 10 | ||
| 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 | |
| 14 | Lesser General Public License for more details. | |
| 15 | ||
| 16 | You should have received a copy of the GNU Lesser General Public | |
| 17 | License along with the GNU C Library; if not, see | |
| 5a82c748 | 18 | <https://www.gnu.org/licenses/>. */ |
| 522e6ee3 CLT |
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 <sysdep.h> | |
| 24 | #define _ERRNO_H 1 | |
| 25 | #include <bits/errno.h> | |
| 26 | #include <tcb-offsets.h> | |
| 27 | ||
| 522e6ee3 CLT |
28 | /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg, |
| 29 | void *parent_tidptr, void *tls, void *child_tidptr) */ | |
| 30 | ||
| 31 | .text | |
| 32 | ENTRY(__clone) | |
| 33 | /* Sanity check arguments. */ | |
| 34 | movi r2, EINVAL | |
| 35 | /* No NULL function pointers. */ | |
| 36 | beq r4, zero, SYSCALL_ERROR_LABEL | |
| 37 | /* No NULL stack pointers. */ | |
| 38 | beq r5, zero, SYSCALL_ERROR_LABEL | |
| 39 | ||
| 40 | subi r5, r5, 8 /* Reserve argument save space. */ | |
| 41 | stw r4, 4(r5) /* Save function pointer. */ | |
| 42 | stw r7, 0(r5) /* Save argument pointer. */ | |
| 43 | ||
| 44 | /* Load arguments. */ | |
| 45 | mov r4, r6 | |
| 46 | ldw r6, 0(sp) | |
| 47 | ldw r7, 8(sp) | |
| 48 | ldw r8, 4(sp) | |
| 49 | ||
| 50 | /* Do the system call. */ | |
| 51 | movi r2, SYS_ify (clone) | |
| 52 | ||
| 53 | /* End FDE now, because in the child the unwind info will be | |
| 54 | wrong. */ | |
| 55 | cfi_endproc | |
| 56 | trap | |
| 57 | ||
| 58 | /* Check for errors. */ | |
| 59 | bne r7, zero, SYSCALL_ERROR_LABEL | |
| 60 | /* See if we're on the newly created thread. */ | |
| 61 | beq r2, zero, thread_start | |
| 62 | /* Successful return from the parent */ | |
| 63 | ret | |
| 64 | ||
| 65 | thread_start: | |
| 66 | cfi_startproc | |
| 67 | cfi_undefined (ra) | |
| 68 | ||
| 522e6ee3 CLT |
69 | ldw r5, 4(sp) /* Function pointer. */ |
| 70 | ldw r4, 0(sp) /* Argument pointer. */ | |
| 71 | addi sp, sp, 8 | |
| 72 | ||
| 73 | /* Call the user's function. */ | |
| 74 | callr r5 | |
| 75 | ||
| 3f823e87 AZ |
76 | /* exit with the result. */ |
| 77 | movi r2, SYS_ify (exit) | |
| 78 | trap | |
| 522e6ee3 CLT |
79 | cfi_endproc |
| 80 | ||
| 81 | cfi_startproc | |
| 82 | PSEUDO_END (__clone) | |
| 9ff72da4 | 83 | libc_hidden_def (__clone) |
| 522e6ee3 | 84 | weak_alias (__clone, clone) |