Remove ia64-linux-gnu

Linux 6.7 removed ia64 from the official tree [1], following the general
principle that a glibc port needs upstream support for the architecture
in all the components it depends on (binutils, GCC, and the Linux
kernel).

Apart from the removal of sysdeps/ia64 and sysdeps/unix/sysv/linux/ia64,
there are updates to various comments referencing ia64 for which removal
of those references seemed appropriate. The configuration is removed
from README and build-many-glibcs.py.

The CONTRIBUTED-BY, elf/elf.h, manual/contrib.texi (the porting
mention), *.po files, config.guess, and longlong.h are not changed.

For Linux it allows cleanup some clone2 support on multiple files.

The following bug can be closed as WONTFIX: BZ 22634 [2], BZ 14250 [3],
BZ 21634 [4], BZ 10163 [5], BZ 16401 [6], and BZ 11585 [7].

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=43ff221426d33db909f7159fdf620c3b052e2d1c
[2] https://sourceware.org/bugzilla/show_bug.cgi?id=22634
[3] https://sourceware.org/bugzilla/show_bug.cgi?id=14250
[4] https://sourceware.org/bugzilla/show_bug.cgi?id=21634
[5] https://sourceware.org/bugzilla/show_bug.cgi?id=10163
[6] https://sourceware.org/bugzilla/show_bug.cgi?id=16401
[7] https://sourceware.org/bugzilla/show_bug.cgi?id=11585
Reviewed-by: Carlos O'Donell <carlos@redhat.com>

1 files changed, 0 insertions, 165 deletions

diff --git a/sysdeps/unix/sysv/linux/ia64/__sigstack_longjmp.c b/sysdeps/unix/sysv/linux/ia64/__sigstack_longjmp.c
deleted file mode 100644
index c9539befe7..0000000000
--- a/sysdeps/unix/sysv/linux/ia64/__sigstack_longjmp.c
+++ /dev/null
@@ -1,165 +0,0 @@
-/* Copyright (C) 2004-2024 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   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
-   <https://www.gnu.org/licenses/>.  */
-
-/* The public __longjmp() implementation is limited to jumping within
-   the same stack.  That is, in general it is not possible to use this
-   __longjmp() implementation to cross from one stack to another.
-   In contrast, the __sigstack_longjmp() implemented here allows
-   crossing from the alternate signal stack to the normal stack
-   as a special case.  */
-
-#include <assert.h>
-#include <setjmp.h>
-#include <signal.h>
-#include <stdint.h>
-#include <stdlib.h>
-
-#include <sysdep.h>
-#include <sys/rse.h>
-
-#define JB_SP	0
-#define JB_BSP	17
-
-struct rbs_flush_values
-  {
-    unsigned long bsp;
-    unsigned long rsc;
-    unsigned long rnat;
-  };
-
-extern struct rbs_flush_values __ia64_flush_rbs (void);
-extern void __ia64_longjmp (__jmp_buf buf, int val, long rnat, long rsc)
-     __attribute__ ((__noreturn__));
-
-static void
-copy_rbs (unsigned long *dst, unsigned long *dst_end, unsigned long dst_rnat,
-	  unsigned long *src, unsigned long *src_end,
-	  unsigned long current_rnat)
-{
-  unsigned long dst_slot, src_rnat = 0, src_slot, *src_rnat_addr, nat_bit;
-  int first_time = 1;
-
-  while (dst < dst_end)
-    {
-      dst_slot = ia64_rse_slot_num (dst);
-      if (dst_slot == 63)
-	{
-	  *dst++ = dst_rnat;
-	  dst_rnat = 0;
-	}
-      else
-	{
-	  /* read source value, including NaT bit: */
-	  src_slot = ia64_rse_slot_num (src);
-	  if (src_slot == 63)
-	    {
-	      /* skip src RNaT slot */
-	      ++src;
-	      src_slot = 0;
-	    }
-	  if (first_time || src_slot == 0)
-	    {
-	      first_time = 0;
-	      src_rnat_addr = ia64_rse_rnat_addr (src);
-	      if (src_rnat_addr < src_end)
-		src_rnat = *src_rnat_addr;
-	      else
-		src_rnat = current_rnat;
-	    }
-	  nat_bit = (src_rnat >> src_slot) & 1;
-
-	  assert (src < src_end);
-
-	  *dst++ = *src++;
-	  if (nat_bit)
-	    dst_rnat |=  (1UL << dst_slot);
-	  else
-	    dst_rnat &= ~(1UL << dst_slot);
-	}
-    }
-  dst_slot = ia64_rse_slot_num (dst);
-  if (dst_slot > 0)
-    *ia64_rse_rnat_addr (dst) = dst_rnat;
-}
-
-void
-__sigstack_longjmp (__jmp_buf buf, int val)
-{
-  unsigned long *rbs_base, *bsp, *bspstore, *jb_bsp, jb_sp, ss_sp;
-  unsigned long ndirty, rnat, load_rnat, *jb_rnat_addr;
-  struct sigcontext *sc;
-  stack_t stk;
-  struct rbs_flush_values c;
-
-  /* put RSE into enforced-lazy mode and return current bsp/rsc/rnat: */
-  c = __ia64_flush_rbs ();
-
-  jb_sp  = ((unsigned long *)  buf)[JB_SP];
-  jb_bsp = ((unsigned long **) buf)[JB_BSP];
-
-  INTERNAL_SYSCALL_CALL (sigaltstack, NULL, &stk);
-
-  ss_sp = (unsigned long) stk.ss_sp;
-  jb_rnat_addr = ia64_rse_rnat_addr (jb_bsp);
-
-  if ((stk.ss_flags & SS_ONSTACK) == 0 || jb_sp - ss_sp < stk.ss_size)
-    /* Normal non-stack-crossing longjmp; if the RNaT slot for the bsp
-       saved in the jump-buffer is the same as the one for the current
-       BSP, use the current AR.RNAT value, otherwise, load it from the
-       jump-buffer's RNaT-slot.  */
-    load_rnat = (ia64_rse_rnat_addr ((unsigned long *) c.bsp) != jb_rnat_addr);
-  else
-    {
-      /* If we are on the alternate signal-stack and the jump-buffer
-	 lies outside the signal-stack, we may need to copy back the
-	 dirty partition which was torn off and saved on the
-	 signal-stack when the signal was delivered.
-
-	 Caveat: we assume that the top of the alternate signal-stack
-		 stores the sigcontext structure of the signal that
-		 caused the switch to the signal-stack.	 This should
-		 be a fairly safe assumption but the kernel _could_
-		 do things differently.. */
-      sc = ((struct sigcontext *) ((ss_sp + stk.ss_size) & -16) - 1);
-
-      /* As a sanity-check, verify that the register-backing-store base
-	 of the alternate signal-stack is where we expect it.  */
-      rbs_base = (unsigned long *)
-	((ss_sp + sizeof (long) - 1) & -sizeof (long));
-
-      assert ((unsigned long) rbs_base == sc->sc_rbs_base);
-
-      ndirty = ia64_rse_num_regs (rbs_base, rbs_base + (sc->sc_loadrs >> 19));
-      bsp = (unsigned long *) sc->sc_ar_bsp;
-      bspstore = ia64_rse_skip_regs (bsp, -ndirty);
-
-      if (bspstore < jb_bsp)
-	/* AR.BSPSTORE at the time of the signal was below the value
-	   of AR.BSP saved in the jump-buffer => copy the missing
-	   portion from the torn off dirty partition which got saved
-	   on the alternate signal-stack.  */
-	copy_rbs (bspstore, jb_bsp, sc->sc_ar_rnat,
-		  rbs_base, (unsigned long *) c.bsp, c.rnat);
-
-      load_rnat = 1;
-    }
-  if (load_rnat)
-    rnat = *jb_rnat_addr;
-  else
-    rnat = c.rnat;
-  __ia64_longjmp (buf, val, rnat, c.rsc);
-}