/* Copyright (C) 2003, 2004 Free Software Foudnation, Inc. This file is part of the GNU C Library. Contributed by Alexandre Oliva <aoliva@redhat.com>, 2003. 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, see <http://www.gnu.org/licenses/>. */ /* 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 <features.h> #include <asm/unistd.h> #define _ERRNO_H 1 #include <bits/errno.h> .text .globl clone .type clone,@function /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg) */ clone: /* Sanity check arguments. */ cmp.p gr8, gr0, icc0 cmp gr9, gr0, icc1 mov.p gr8, gr4 beq icc0, #0, .Lerror mov.p gr11, gr5 beq icc1, #0, .Lerror mov.p gr10, gr8 setlos #__NR_clone, gr7 tra gr0,gr0 cmp.p gr8, gr0, icc0 setlos #-4096, gr6 cmp.p gr8, gr6, icc1 beq icc0, #0, .Lthread_start blslr icc1, #2 .Lsys_error: sethi.p #gotofffuncdeschi(__syscall_error), gr14 setlo #gotofffuncdesclo(__syscall_error), gr14 ldd @(gr14, gr15), gr14 jmpl @(gr14, gr0) .Lerror: setlos.p #-EINVAL, gr8 bra .Lsys_error ############################################################################### # # come here as the new thread [GR4 is fn, GR5 is arg] # ############################################################################### .Lthread_start: /* Save the PIC register. */ mov gr15, gr17 /* Call the user's function. */ ldd.p @(gr4, gr0), gr14 mov gr5, gr8 calll @(gr14, gr0) /* Call _exit, rather simply inlining the syscall, such that breakpoints work.*/ mov.p gr17, gr15 call HIDDEN_JUMPTARGET(_exit) /* Should never get here. */ jmpl @(gr0, gr0) .size clone,.-clone