projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| b35e2407 UD |
1 | /* Copyright (C) 1996, 1997, 2000 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. | |
| 3 | Contributed by David Huggins-Daines <dhd@debian.org>, 2000. | |
| 4 | Based on the Alpha version by Richard Henderson <rth@tamu.edu>, 1996. | |
| 5 | ||
| 6 | The GNU C Library is free software; you can redistribute it and/or | |
| 7 | modify it under the terms of the GNU Library General Public License as | |
| 8 | published by the Free Software Foundation; either version 2 of the | |
| 9 | 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 | Library General Public License for more details. | |
| 15 | ||
| 16 | You should have received a copy of the GNU Library General Public | |
| 17 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
| 18 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 19 | Boston, MA 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/unistd.h> | |
| 25 | #include <sysdep.h> | |
| 26 | #define _ERRNO_H 1 | |
| 27 | #include <bits/errno.h> | |
| 28 | ||
| 29 | /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg) */ | |
| 30 | ||
| 31 | .text | |
| 32 | ENTRY(__clone) | |
| 33 | /* FIXME: I have no idea how profiling works on hppa. */ | |
| 34 | ||
| 35 | /* Sanity check arguments. */ | |
| 36 | comib,<> 0,%arg0,.Lerror /* no NULL function pointers */ | |
| 37 | ldi EINVAL,%ret0 | |
| 38 | comib,<> 0,%arg1,.Lerror /* no NULL stack pointers */ | |
| 39 | nop | |
| 40 | ||
| 41 | /* Save the fn ptr and arg on the new stack. */ | |
| 42 | stwm %arg3,64(%arg1) | |
| 43 | stw %arg3,-60(%arg1) | |
| 44 | ||
| 45 | /* Do the system call */ | |
| 46 | copy %arg2,%arg0 | |
| 47 | ble 0x100(%sr7,%r0) | |
| 48 | ldi __NR_clone,%r20 | |
| 49 | ||
| 50 | ldi -4096,%r1 | |
| 51 | comclr,>>= %r1,%ret0,%r0 /* Note: unsigned compare. */ | |
| 52 | b,n .Lerror | |
| 53 | ||
| 54 | comib,=,n 0,%ret0,thread_start | |
| 55 | ||
| 56 | /* Successful return from the parent */ | |
| 57 | bv %r0(%rp) | |
| 58 | nop | |
| 59 | ||
| 60 | /* Something bad happened -- no child created */ | |
| 61 | .Lerror: | |
| 62 | b __syscall_error | |
| 63 | nop | |
| 64 | ||
| 65 | thread_start: | |
| 66 | /* Load up the arguments. */ | |
| 67 | ldw -60(%sp),%arg0 | |
| 68 | ldwm -64(%sp),%r22 | |
| 69 | ||
| 70 | /* Call the user's function */ | |
| 71 | bl $$dyncall,%r31 | |
| 72 | copy %r31,%rp | |
| 73 | ||
| 74 | bl _exit,%rp | |
| 75 | copy %ret0,%arg0 | |
| 76 | ||
| 77 | /* Die horribly. */ | |
| 78 | iitlbp %r0,(%r0) | |
| 79 | ||
| 80 | PSEUDO_END(__clone) | |
| 81 | ||
| 82 | weak_alias(__clone, clone) |