gdb/ia64-linux-tdep.c

   1 /* Target-dependent code for the IA-64 for GDB, the GNU debugger.
   2    Copyright 2000
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23 #include "arch-utils.h"
  24
  25 /* The sigtramp code is in a non-readable (executable-only) region
  26    of memory called the ``gate page''.  The addresses in question
  27    were determined by examining the system headers.  They are
  28    overly generous to allow for different pages sizes. */
  29
  30 #define GATE_AREA_START 0xa000000000000100LL
  31 #define GATE_AREA_END   0xa000000000010000LL
  32
  33 /* Offset to sigcontext structure from frame of handler */
  34 #define IA64_LINUX_SIGCONTEXT_OFFSET 160
  35
  36 int
  37 ia64_linux_in_sigtramp (CORE_ADDR pc, char *func_name)
  38 {
  39   return (pc >= (CORE_ADDR) GATE_AREA_START && pc < (CORE_ADDR) GATE_AREA_END);
  40 }
  41
  42 /* IA-64 GNU/Linux specific function which, given a frame address and
  43    a register number, returns the address at which that register may be
  44    found.  0 is returned for registers which aren't stored in the the
  45    sigcontext structure. */
  46
  47 CORE_ADDR
  48 ia64_linux_sigcontext_register_address (CORE_ADDR sp, int regno)
  49 {
  50   if (IA64_GR0_REGNUM <= regno && regno <= IA64_GR31_REGNUM)
  51     return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 200 + 8 * (regno - IA64_GR0_REGNUM);
  52   else if (IA64_BR0_REGNUM <= regno && regno <= IA64_BR7_REGNUM)
  53     return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 136 + 8 * (regno - IA64_BR0_REGNUM);
  54   else if (IA64_FR0_REGNUM <= regno && regno <= IA64_FR127_REGNUM)
  55     return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 464 + 16 * (regno - IA64_FR0_REGNUM);
  56   else
  57     switch (regno)
  58       {
  59       case IA64_IP_REGNUM :
  60         return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 40;
  61       case IA64_CFM_REGNUM :
  62         return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 48;
  63       case IA64_PSR_REGNUM :
  64         return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 56;          /* user mask only */
  65       /* sc_ar_rsc is provided, from which we could compute bspstore, but
  66          I don't think it's worth it.  Anyway, if we want it, it's at offset
  67          64 */
  68       case IA64_BSP_REGNUM :
  69         return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 72;
  70       case IA64_RNAT_REGNUM :
  71         return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 80;
  72       case IA64_CCV_REGNUM :
  73         return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 88;
  74       case IA64_UNAT_REGNUM :
  75         return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 96;
  76       case IA64_FPSR_REGNUM :
  77         return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 104;
  78       case IA64_PFS_REGNUM :
  79         return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 112;
  80       case IA64_LC_REGNUM :
  81         return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 120;
  82       case IA64_PR_REGNUM :
  83         return sp + IA64_LINUX_SIGCONTEXT_OFFSET + 128;
  84       default :
  85         return 0;
  86       }
  87 }