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diff --git a/gdb/ia64-aix-tdep.c b/gdb/ia64-aix-tdep.c
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+/* Target-dependent code for the IA-64 for GDB, the GNU debugger.
+ Copyright 2000, 2001
+ Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include "defs.h"
+
+/* External hook for finding gate addresses on AIX. */
+void (*aix5_find_gate_addresses_hook) (CORE_ADDR *, CORE_ADDR *) = 0;
+
+/* Offset to sc_context member of sigcontext structure from frame of handler */
+#define IA64_AIX_SIGCONTEXT_OFFSET 64
+
+/* Return a non-zero value iff PC is in a signal trampoline. On
+ AIX, we determine this by seeing if the pc is in a special
+ execute only page called the ``gate page''. The addresses in
+ question are determined by letting the AIX native portion of
+ the code determine these addresses via its own nefarious
+ means. */
+
+int
+ia64_aix_in_sigtramp (CORE_ADDR pc, char *func_name)
+{
+ CORE_ADDR gate_area_start, gate_area_end;
+
+ if (aix5_find_gate_addresses_hook == 0)
+ return 0;
+
+ (*aix5_find_gate_addresses_hook) (&gate_area_start, &gate_area_end);
+
+ return (pc >= gate_area_start && pc < gate_area_end);
+}
+
+
+/* IA-64 AIX specific function which, given a frame address and
+ a register number, returns the address at which that register may be
+ found. 0 is returned for registers which aren't stored in the
+ sigcontext structure. */
+
+CORE_ADDR
+ia64_aix_sigcontext_register_address (CORE_ADDR sp, int regno)
+{
+ /* The hardcoded offsets that follow are actually offsets to the
+ corresponding members in struct __context in
+ /usr/include/sys/context.h (on an IA-64 AIX5 box). */
+ if (IA64_GR0_REGNUM <= regno && regno <= IA64_GR31_REGNUM)
+ return sp + IA64_AIX_SIGCONTEXT_OFFSET + 152 + 8 * (regno - IA64_GR0_REGNUM);
+ else if (IA64_BR0_REGNUM <= regno && regno <= IA64_BR7_REGNUM)
+ return sp + IA64_AIX_SIGCONTEXT_OFFSET + 408 + 8 * (regno - IA64_BR0_REGNUM);
+ else if (IA64_FR0_REGNUM <= regno && regno <= IA64_FR127_REGNUM)
+ return sp + IA64_AIX_SIGCONTEXT_OFFSET + 480 + 16 * (regno - IA64_FR0_REGNUM);
+ else
+ switch (regno)
+ {
+ case IA64_PSR_REGNUM :
+ return sp + IA64_AIX_SIGCONTEXT_OFFSET + 0;
+ case IA64_IP_REGNUM :
+ return sp + IA64_AIX_SIGCONTEXT_OFFSET + 8;
+ /* iipa is at 16.
+ isr is at 24.
+ ifa is at 32.
+ iim is at 40. */
+ case IA64_CFM_REGNUM :
+ return sp + IA64_AIX_SIGCONTEXT_OFFSET + 48; /* ifs, actually */
+ case IA64_RSC_REGNUM :
+ return sp + IA64_AIX_SIGCONTEXT_OFFSET + 56;
+ case IA64_BSP_REGNUM :
+ return sp + IA64_AIX_SIGCONTEXT_OFFSET + 64;
+ case IA64_BSPSTORE_REGNUM :
+ return sp + IA64_AIX_SIGCONTEXT_OFFSET + 72;
+ case IA64_RNAT_REGNUM :
+ return sp + IA64_AIX_SIGCONTEXT_OFFSET + 80;
+ case IA64_PFS_REGNUM :
+ return sp + IA64_AIX_SIGCONTEXT_OFFSET + 88;
+ case IA64_UNAT_REGNUM :
+ return sp + IA64_AIX_SIGCONTEXT_OFFSET + 96;
+ case IA64_PR_REGNUM :
+ return sp + IA64_AIX_SIGCONTEXT_OFFSET + 104;
+ case IA64_CCV_REGNUM :
+ return sp + IA64_AIX_SIGCONTEXT_OFFSET + 112;
+ case IA64_LC_REGNUM :
+ return sp + IA64_AIX_SIGCONTEXT_OFFSET + 120;
+ case IA64_EC_REGNUM :
+ return sp + IA64_AIX_SIGCONTEXT_OFFSET + 128;
+ /* nats is at 136; this is an address independent NaT bitmask */
+ case IA64_FPSR_REGNUM :
+ return sp + IA64_AIX_SIGCONTEXT_OFFSET + 144;
+ default :
+ return 0;
+ }
+}