| /* Copyright (C) 1997, 2000, 2007 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Richard Henderson (rth@tamu.edu). |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| /* clone() is even more special than fork() as it mucks with stacks |
| and invokes a function in the right context after its all over. */ |
| |
| #include <asm/errno.h> |
| #include <asm/unistd.h> |
| #include <tcb-offsets.h> |
| #include <sysdep.h> |
| |
| #define CLONE_VM 0x00000100 |
| #define CLONE_THREAD 0x00010000 |
| |
| /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg, |
| pid_t *ptid, void *tls, pid_t *ctid); */ |
| |
| .register %g2,#scratch |
| .register %g3,#scratch |
| |
| .text |
| |
| ENTRY (__clone) |
| save %sp, -192, %sp |
| cfi_def_cfa_register(%fp) |
| cfi_window_save |
| cfi_register(%o7, %i7) |
| |
| /* sanity check arguments */ |
| brz,pn %i0, 99f /* fn non-NULL? */ |
| mov %i0, %g2 |
| brz,pn %i1, 99f /* child_stack non-NULL? */ |
| mov %i2, %o0 /* clone flags */ |
| |
| /* The child_stack is the top of the stack, allocate one |
| whole stack frame from that as this is what the kernel |
| expects. Also, subtract STACK_BIAS. */ |
| sub %i1, 192 + 0x7ff, %o1 |
| mov %i3, %g3 |
| mov %i2, %g4 |
| |
| mov %i4,%o2 /* PTID */ |
| mov %i5,%o3 /* TLS */ |
| ldx [%fp+0x7ff+176],%o4 /* CTID */ |
| |
| /* Do the system call */ |
| set __NR_clone, %g1 |
| ta 0x6d |
| bcs,pn %xcc, 98f |
| nop |
| brnz,pn %o1, __thread_start |
| nop |
| jmpl %i7 + 8, %g0 |
| restore %o0, %g0, %o0 |
| 99: mov EINVAL, %o0 |
| 98: call HIDDEN_JUMPTARGET(__errno_location) |
| mov %o0, %i0 |
| st %i0, [%o0] |
| jmpl %i7 + 8, %g0 |
| restore %g0,-1,%o0 |
| END(__clone) |
| |
| .type __thread_start,@function |
| __thread_start: |
| #ifdef RESET_PID |
| sethi %hi(CLONE_THREAD), %l0 |
| andcc %g4, %l0, %g0 |
| bne,pt %icc, 1f |
| andcc %g4, CLONE_VM, %g0 |
| bne,a,pn %icc, 2f |
| mov -1,%o0 |
| set __NR_getpid,%g1 |
| ta 0x6d |
| 2: st %o0,[%g7 + PID] |
| st %o0,[%g7 + TID] |
| 1: |
| #endif |
| mov %g0, %fp /* terminate backtrace */ |
| call %g2 |
| mov %g3,%o0 |
| call HIDDEN_JUMPTARGET(_exit),0 |
| nop |
| |
| .size __thread_start, .-__thread_start |
| |
| weak_alias (__clone, clone) |
