| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame^] | 1 | /* Copyright (C) 1996, 1997, 1998, 2000, 2003, 2004, 2007 |
| 2 | Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | Contributed by Richard Henderson (rth@tamu.edu). |
| 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, write to the Free |
| 18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 19 | 02111-1307 USA. */ |
| 20 | |
| 21 | /* clone() is even more special than fork() as it mucks with stacks |
| 22 | and invokes a function in the right context after its all over. */ |
| 23 | |
| 24 | #include <asm/errno.h> |
| 25 | #include <asm/unistd.h> |
| 26 | #include <tcb-offsets.h> |
| 27 | #include <sysdep.h> |
| 28 | |
| 29 | #define CLONE_VM 0x00000100 |
| 30 | #define CLONE_THREAD 0x00010000 |
| 31 | |
| 32 | /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg, |
| 33 | pid_t *ptid, void *tls, pid_t *ctid); */ |
| 34 | |
| 35 | .text |
| 36 | ENTRY (__clone) |
| 37 | save %sp,-96,%sp |
| 38 | cfi_def_cfa_register(%fp) |
| 39 | cfi_window_save |
| 40 | cfi_register(%o7, %i7) |
| 41 | |
| 42 | /* sanity check arguments */ |
| 43 | orcc %i0,%g0,%g2 |
| 44 | be .Leinval |
| 45 | orcc %i1,%g0,%o1 |
| 46 | be .Leinval |
| 47 | mov %i2,%o0 |
| 48 | |
| 49 | /* The child_stack is the top of the stack, allocate one |
| 50 | whole stack frame from that as this is what the kernel |
| 51 | expects. */ |
| 52 | sub %o1, 96, %o1 |
| 53 | mov %i3, %g3 |
| 54 | mov %i2, %g4 |
| 55 | |
| 56 | /* ptid */ |
| 57 | mov %i4,%o2 |
| 58 | /* tls */ |
| 59 | mov %i5,%o3 |
| 60 | /* ctid */ |
| 61 | ld [%fp+92],%o4 |
| 62 | |
| 63 | /* Do the system call */ |
| 64 | set __NR_clone,%g1 |
| 65 | ta 0x10 |
| 66 | bcs .Lerror |
| 67 | tst %o1 |
| 68 | bne __thread_start |
| 69 | nop |
| 70 | jmpl %i7 + 8, %g0 |
| 71 | restore %o0,%g0,%o0 |
| 72 | |
| 73 | .Leinval: |
| 74 | mov EINVAL, %o0 |
| 75 | .Lerror: |
| 76 | call __errno_location |
| 77 | mov %o0, %i0 |
| 78 | st %i0,[%o0] |
| 79 | jmpl %i7 + 8, %g0 |
| 80 | restore %g0,-1,%o0 |
| 81 | END(__clone) |
| 82 | |
| 83 | .type __thread_start,@function |
| 84 | __thread_start: |
| 85 | #ifdef RESET_PID |
| 86 | sethi %hi(CLONE_THREAD), %l0 |
| 87 | andcc %g4, %l0, %g0 |
| 88 | bne 1f |
| 89 | andcc %g4, CLONE_VM, %g0 |
| 90 | bne,a 2f |
| 91 | mov -1,%o0 |
| 92 | set __NR_getpid,%g1 |
| 93 | ta 0x10 |
| 94 | 2: |
| 95 | st %o0,[%g7 + PID] |
| 96 | st %o0,[%g7 + TID] |
| 97 | 1: |
| 98 | #endif |
| 99 | mov %g0, %fp /* terminate backtrace */ |
| 100 | call %g2 |
| 101 | mov %g3,%o0 |
| 102 | call exit,0 |
| 103 | nop |
| 104 | |
| 105 | .size __thread_start, .-__thread_start |
| 106 | |
| 107 | weak_alias (__clone, clone) |