gdb/ia64-linux-tdep.c

   1 /* Target-dependent code for the IA-64 for GDB, the GNU debugger.
   2
   3    Copyright 2000, 2004 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 "ia64-tdep.h"
  24 #include "arch-utils.h"
  25 #include "gdbcore.h"
  26
  27 /* The sigtramp code is in a non-readable (executable-only) region
  28    of memory called the ``gate page''.  The addresses in question
  29    were determined by examining the system headers.  They are
  30    overly generous to allow for different pages sizes. */
  31
  32 #define GATE_AREA_START 0xa000000000000100LL
  33 #define GATE_AREA_END   0xa000000000020000LL
  34
  35 /* Offset to sigcontext structure from frame of handler */
  36 #define IA64_LINUX_SIGCONTEXT_OFFSET 192
  37
  38 int
  39 ia64_linux_in_sigtramp (CORE_ADDR pc, char *func_name)
  40 {
  41   return (pc >= (CORE_ADDR) GATE_AREA_START && pc < (CORE_ADDR) GATE_AREA_END);
  42 }
  43
  44 /* IA-64 GNU/Linux specific function which, given a frame address and
  45    a register number, returns the address at which that register may be
  46    found.  0 is returned for registers which aren't stored in the the
  47    sigcontext structure. */
  48
  49 CORE_ADDR
  50 ia64_linux_sigcontext_register_address (CORE_ADDR sp, int regno)
  51 {
  52   char buf[8];
  53   CORE_ADDR sigcontext_addr = 0;
  54
  55   /* The address of the sigcontext area is found at offset 16 in the sigframe.  */
  56   read_memory (sp + 16, buf, 8);
  57   sigcontext_addr = extract_unsigned_integer (buf, 8);
  58
  59   if (IA64_GR0_REGNUM <= regno && regno <= IA64_GR31_REGNUM)
  60     return sigcontext_addr + 200 + 8 * (regno - IA64_GR0_REGNUM);
  61   else if (IA64_BR0_REGNUM <= regno && regno <= IA64_BR7_REGNUM)
  62     return sigcontext_addr + 136 + 8 * (regno - IA64_BR0_REGNUM);
  63   else if (IA64_FR0_REGNUM <= regno && regno <= IA64_FR127_REGNUM)
  64     return sigcontext_addr + 464 + 16 * (regno - IA64_FR0_REGNUM);
  65   else
  66     switch (regno)
  67       {
  68       case IA64_IP_REGNUM :
  69         return sigcontext_addr + 40;
  70       case IA64_CFM_REGNUM :
  71         return sigcontext_addr + 48;
  72       case IA64_PSR_REGNUM :
  73         return sigcontext_addr + 56;            /* user mask only */
  74       /* sc_ar_rsc is provided, from which we could compute bspstore, but
  75          I don't think it's worth it.  Anyway, if we want it, it's at offset
  76          64 */
  77       case IA64_BSP_REGNUM :
  78         return sigcontext_addr + 72;
  79       case IA64_RNAT_REGNUM :
  80         return sigcontext_addr + 80;
  81       case IA64_CCV_REGNUM :
  82         return sigcontext_addr + 88;
  83       case IA64_UNAT_REGNUM :
  84         return sigcontext_addr + 96;
  85       case IA64_FPSR_REGNUM :
  86         return sigcontext_addr + 104;
  87       case IA64_PFS_REGNUM :
  88         return sigcontext_addr + 112;
  89       case IA64_LC_REGNUM :
  90         return sigcontext_addr + 120;
  91       case IA64_PR_REGNUM :
  92         return sigcontext_addr + 128;
  93       default :
  94         return 0;
  95       }
  96 }