| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc. |
| 2 | |
| 3 | The GNU C Library is free software; you can redistribute it and/or |
| 4 | modify it under the terms of the GNU Library General Public License as |
| 5 | published by the Free Software Foundation; either version 2 of the |
| 6 | License, or (at your option) any later version. |
| 7 | |
| 8 | The GNU C Library is distributed in the hope that it will be useful, |
| 9 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | Library General Public License for more details. |
| 12 | |
| 13 | You should have received a copy of the GNU Library General Public |
| 14 | License along with the GNU C Library; see the file COPYING.LIB. If not, |
| 15 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 16 | Boston, MA 02111-1307, USA. */ |
| 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 <sys/syscall.h> |
| 22 | |
| 23 | #warning "This file contains a hardcoded constant for SYS_clone" |
| 24 | |
| 25 | .section .rodata |
| 26 | .align 2 |
| 27 | .LC0: .long 120 /* SYS_clone */ |
| 28 | .align 4 |
| 29 | .text |
| 30 | .type clone,@function |
| 31 | .globl clone; |
| 32 | clone: |
| 33 | .word 0x0040 |
| 34 | /* subl2 $8, %sp */ |
| 35 | movl 4(%ap), %r1 |
| 36 | movl 8(%ap), %r0 |
| 37 | mcoml $21, %r6 |
| 38 | |
| 39 | /* Sanity check args. */ |
| 40 | tstl %r1 |
| 41 | jeql CLONE_ERROR_LABEL |
| 42 | tstl %r0 |
| 43 | jeql CLONE_ERROR_LABEL |
| 44 | |
| 45 | /* Need to setup the child stack the same as the parent. */ |
| 46 | subl2 $24, %r0 |
| 47 | movl 16(%ap), 20(%r0) |
| 48 | movl %r1, 16(%r0) |
| 49 | movl %r0, %r1 |
| 50 | addl2 $16, %r1 |
| 51 | movl %r1, 12(%r0) |
| 52 | |
| 53 | /* Do the system call. */ |
| 54 | pushl %ap |
| 55 | pushl %r0 |
| 56 | pushl 12(%ap) |
| 57 | pushl $0x2 |
| 58 | movl %sp, %ap |
| 59 | chmk .LC0 /* %r0 .LC0 -4(%fp) -8(%fp) */ |
| 60 | addl2 $12, %sp |
| 61 | movl (%sp)+, %ap |
| 62 | movl %r0, %r6 |
| 63 | jneq CLONE_ERROR_LABEL |
| 64 | |
| 65 | movl $0, %fp |
| 66 | pushl 4(%ap) |
| 67 | movl (%r1), %r0 |
| 68 | calls $1, (%r0) |
| 69 | pushl %r0 |
| 70 | calls $1, HIDDEN_JUMPTARGET(_exit) |
| 71 | |
| 72 | CLONE_ERROR_LABEL: |
| 73 | cmpl %r6, $-126 /* -ENOKEY?!?! Fuck, this must be wrong! FIXME */ |
| 74 | jlequ CLONE_RETURN_LABEL |
| 75 | calls $0, __errno_location |
| 76 | mnegl %r6, (%r0) |
| 77 | mcoml $0, %r6 |
| 78 | movl %r6, %r0 |
| 79 | ret |
| 80 | |
| 81 | CLONE_RETURN_LABEL: |
| 82 | ret |
| 83 | |
| 84 | .size clone,.-clone |
| 85 | |