| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame^] | 1 | /* Copyright (C) 1996, 1997, 1998, 2000 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | Contributed by Richard Henderson (rth@tamu.edu). |
| 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, write to the Free |
| 17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 18 | 02111-1307 USA. */ |
| 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 <asm/errno.h> |
| 24 | #include <sys/syscall.h> |
| 25 | #include "NM_Macros.S" |
| 26 | |
| 27 | /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */ |
| 28 | |
| 29 | .text |
| 30 | .align 2 |
| 31 | .globl clone |
| 32 | .type clone,@function |
| 33 | |
| 34 | clone: |
| 35 | save %sp,-16 |
| 36 | |
| 37 | MOVIP %l0, -EINVAL |
| 38 | /* sanity check arguments */ |
| 39 | skprnz %i0 /* no NULL function pointers */ |
| 40 | br CLONE_ERROR_LABEL |
| 41 | mov %o0, %i2 |
| 42 | |
| 43 | skprnz %i1 /* no NULL stack pointers */ |
| 44 | br CLONE_ERROR_LABEL |
| 45 | mov %o1, %i1 |
| 46 | |
| 47 | /* Do the system call */ |
| 48 | MOVIP %g1, __NR_clone |
| 49 | trap 63 |
| 50 | |
| 51 | /* if ret >=0? */ |
| 52 | cmpi %o0, 0 |
| 53 | skps cc_pl |
| 54 | br CLONE_ERROR_LABEL |
| 55 | mov %l0, %o0 |
| 56 | |
| 57 | /* Start thread */ |
| 58 | skprz %o1 |
| 59 | br __thread_start |
| 60 | nop |
| 61 | mov %i0, %o0 |
| 62 | ret |
| 63 | restore |
| 64 | |
| 65 | CLONE_ERROR_LABEL: |
| 66 | neg %l0 |
| 67 | MOVIA %g1, __errno_location@h |
| 68 | call %g1 |
| 69 | nop |
| 70 | st [%o0], %l0 /* store errno */ |
| 71 | |
| 72 | xor %i0, %i0 |
| 73 | dec %i0 /* retval=-1 */ |
| 74 | ret |
| 75 | restore |
| 76 | |
| 77 | .size clone, .-clone |
| 78 | |
| 79 | .type __thread_start,@function |
| 80 | |
| 81 | __thread_start: |
| 82 | call %i0 |
| 83 | mov %o0, %i3 |
| 84 | MOVIA %g1, _exit@h |
| 85 | call %g1 |
| 86 | nop |
| 87 | |
| 88 | .size __thread_start, .-__thread_start |