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f212e8dcf8
* sysdeps/alpha/dl-machine.h (RTLD_START): Fix top-of-stack backtrace.
* sysdeps/unix/sysv/linux/alpha/clone.S: Likewise.
* sysdeps/alpha/elf/start.S: Likewise. Remove pointless allocation.
* sysdeps/unix/sysv/linux/alpha/rt_sigaction.S: Use standard ldgp
entry sequence and explicit relocs. Add unwind info for sigreturn
and rt_sigreturn.
* configure.in (libc_cv_asm_cfi_directives): Test .cfi_remember_state.
* configure: Regenerate.
108 lines
2.6 KiB
ArmAsm
108 lines
2.6 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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/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg,
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pid_t *tid, void *tls);
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*/
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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 a1,16,a1
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stq a0,0(a1)
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stq a3,8(a1)
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/* Shift the flags, tid and 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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mov a5,a3
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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 zero,0,zero,0
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.prologue 0
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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,16,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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jsr ra,_exit
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/* Die horribly. */
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halt
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.end thread_start
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weak_alias(__clone, clone)
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