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