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150 lines
3.4 KiB
ArmAsm
150 lines
3.4 KiB
ArmAsm
/* Copyright (C) 1996, 1997, 2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Richard Henderson <rth@tamu.edu>, 1996.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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/* clone() is even more special than fork() as it mucks with stacks
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and invokes a function in the right context after its all over. */
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#include <sysdep.h>
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#define _ERRNO_H 1
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#include <bits/errno.h>
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#define CLONE_VM 0x00000100
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#define CLONE_THREAD 0x00010000
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/* int clone(int (*fn)(void *arg), void *child_stack, int flags,
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void *arg, pid_t *ptid, void *tls, pid_t *ctid);
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Note that everything past ARG is technically optional, based
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on FLAGS, and that CTID is arg 7, and thus is on the stack.
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However, since a load from top-of-stack better be legal always,
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we don't bother checking FLAGS. */
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.text
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ENTRY(__clone)
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#ifdef PROF
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ldgp gp,0(pv)
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.set noat
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lda AT, _mcount
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jsr AT, (AT), _mcount
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.set at
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.prologue 1
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#else
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.prologue 0
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#endif
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/* Sanity check arguments. */
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ldiq v0,EINVAL
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beq a0,$error /* no NULL function pointers */
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beq a1,$error /* no NULL stack pointers */
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/* Save the fn ptr and arg on the new stack. */
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subq a1,32,a1
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stq a0,0(a1)
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stq a3,8(a1)
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#ifdef RESET_PID
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stq a2,16(a1)
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#endif
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/* The syscall is of the form clone(flags, usp, ptid, ctid, tls).
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Shift the flags, ptid, ctid, tls arguments into place; the
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child_stack argument is already correct. */
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mov a2,a0
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mov a4,a2
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ldq a3,0(sp)
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mov a5,a4
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/* Do the system call. */
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ldiq v0,__NR_clone
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call_pal PAL_callsys
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bne a3,$error
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beq v0,thread_start
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/* Successful return from the parent. */
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ret
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/* Something bad happened -- no child created. */
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$error:
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#ifndef PROF
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br gp,1f
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1: ldgp gp,0(gp)
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#endif
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SYSCALL_ERROR_HANDLER
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END(__clone)
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/* Load up the arguments to the function. Put this block of code in
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its own function so that we can terminate the stack trace with our
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debug info. */
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.ent thread_start
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thread_start:
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.frame fp,0,fp,0
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mov 0, fp
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.prologue 0
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#ifdef RESET_PID
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/* Check and see if we need to reset the PID. */
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ldq t0,16(sp)
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lda t1,CLONE_THREAD
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and t0,t1,t2
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beq t2,2f
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1:
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#endif
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/* Load up the arguments. */
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ldq pv,0(sp)
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ldq a0,8(sp)
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addq sp,32,sp
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/* Call the user's function. */
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jsr ra,(pv)
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ldgp gp,0(ra)
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/* Call _exit rather than doing it inline for breakpoint purposes. */
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mov v0,a0
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#ifdef PIC
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bsr ra, HIDDEN_JUMPTARGET(_exit) !samegp
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#else
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jsr ra, HIDDEN_JUMPTARGET(_exit)
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#endif
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/* Die horribly. */
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halt
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#ifdef RESET_PID
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2:
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rduniq
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lda t1, CLONE_VM
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mov v0, s0
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lda v0, -1
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and t0, t1, t2
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bne t2, 3f
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lda v0, __NR_getxpid
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callsys
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3:
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stl v0, PID_OFFSET(s0)
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stl v0, TID_OFFSET(s0)
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br 1b
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#endif
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.end thread_start
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weak_alias(__clone, clone)
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