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2003-12-02 David Mosberger <davidm@hpl.hp.com> * sysdeps/ia64/elf/initfini.c: Add unwind info. * sysdeps/ia64/dl-machine.h (elf_machine_matches_host): Mark with attribute "unused". (elf_machine_dynamic): Mark with attributes "unused" and "const". (elf_machine_runtime_setup): Likewise. * sysdeps/generic/dl-fptr.c (make_fptr_table): Mark with attribute "always_inline". * sysdeps/ia64/dl-machine.h (__ia64_init_bootstrap_fdesc_table): Likewise. * configure.in: Check whether compiler has libunwind support. * config.make.in (have-cc-with-libunwind): New variable. * config.h.in (HAVE_CC_WITH_LIBUNWIND): New macro. * Makeconfig (gnulib): If have-cc-withh-libunwind is "yes", also mention -lunwind. 003-11-12 David Mosberger <davidm@hpl.hp.com> * sysdeps/unix/sysv/linux/ia64/sysdep.h: Define DO_CALL_VIA_BREAK. Redefine DO_CALL to use vdso if supported, otherwise DO_CALL_VIA_BREAK. Likewise for DO_INLINE_SYSCALL. Make INTERNAL_SYSCALL use DO_INLINE_SYSCALL. * sysdeps/unix/sysv/linux/ia64/vfork.S: Use DO_CALL_VIA_BREAK() instead of DO_CALL(). * sysdeps/unix/sysv/linux/ia64/clone2.S: Use break directly instead of DO_CALL(). * sysdeps/unix/sysv/linux/ia64/brk.S (__curbrk): Restructure it to take advantage of DO_CALL() macro. * sysdeps/unix/sysv/linux/ia64/setcontext.S: Likewise. * sysdeps/unix/sysv/linux/ia64/getcontext.S: Likewise. * elf/rtld.c (dl_main): Restrict dl_sysinfo_dso check to first program header. On ia64, the check failed previously because there are two program headers. * sysdeps/generic/s_nexttowardf.c: Likewise. * math/bug-nexttoward.c: New file.
85 lines
3.0 KiB
ArmAsm
85 lines
3.0 KiB
ArmAsm
/* Copyright (C) 2000, 2001, 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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#include <sysdep.h>
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#include <asm/errno.h>
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/* int __clone2(int (*fn) (void *arg), void *child_stack_base, */
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/* size_t child_stack_size, int flags, void *arg, */
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/* pid_t *parent_tid, void *tls, pid_t *child_tid) */
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#define CHILD p8
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#define PARENT p9
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ENTRY(__clone2)
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.prologue
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alloc r2=ar.pfs,8,0,6,0
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cmp.eq p6,p0=0,in0
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mov r8=EINVAL
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mov out0=in3 /* Flags are first syscall argument. */
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mov out1=in1 /* Stack address. */
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(p6) br.cond.spnt.many __syscall_error
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;;
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mov out2=in2 /* Stack size. */
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mov out3=in5 /* Parent TID Pointer */
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mov out4=in7 /* Child TID Pointer */
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mov out5=in6 /* TLS pointer */
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/*
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* clone2() is special: the child cannot execute br.ret right
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* after the system call returns, because it starts out
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* executing on an empty stack. Because of this, we can't use
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* the new (lightweight) syscall convention here. Instead, we
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* just fall back on always using "break".
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*
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* Furthermore, since the child starts with an empty stack, we
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* need to avoid unwinding past invalid memory. To that end,
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* we'll pretend now that __clone2() is the end of the
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* call-chain. This is wrong for the parent, but only until
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* it returns from clone2() but it's better than the
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* alternative.
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*/
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mov r15=SYS_ify (clone2)
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.save rp, r0
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break __BREAK_SYSCALL
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.body
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cmp.eq p6,p0=-1,r10
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cmp.eq CHILD,PARENT=0,r8 /* Are we the child? */
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(p6) br.cond.spnt.many __syscall_error
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;;
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(CHILD) ld8 out1=[in0],8 /* Retrieve code pointer. */
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(CHILD) mov out0=in4 /* Pass proper argument to fn */
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(PARENT) ret
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;;
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ld8 gp=[in0] /* Load function gp. */
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mov b6=out1
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br.call.dptk.many rp=b6 /* Call fn(arg) in the child */
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;;
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mov out0=r8 /* Argument to _exit */
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.globl _exit
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br.call.dpnt.many rp=_exit /* call _exit with result from fn. */
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ret /* Not reached. */
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PSEUDO_END(__clone2)
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/* For now we leave __clone undefined. This is unlikely to be a */
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/* problem, since at least the i386 __clone in glibc always failed */
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/* with a 0 sp (eventhough the kernel explicitly handled it). */
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/* Thus all such calls needed to pass an explicit sp, and as a result, */
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/* would be unlikely to work on ia64. */
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