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 #include "gdbcore.h"
  25
  26 /* The sigtramp code is in a non-readable (executable-only) region
  27    of memory called the ``gate page''.  The addresses in question
  28    were determined by examining the system headers.  They are
  29    overly generous to allow for different pages sizes. */
  30
  31 #define GATE_AREA_START 0xa000000000000100LL
  32 #define GATE_AREA_END   0xa000000000010000LL
  33
  34 /* Offset to sigcontext structure from frame of handler */
  35 #define IA64_LINUX_SIGCONTEXT_OFFSET 192
  36
  37 int
  38 ia64_linux_in_sigtramp (CORE_ADDR pc, char *func_name)
  39 {
  40   return (pc >= (CORE_ADDR) GATE_AREA_START && pc < (CORE_ADDR) GATE_AREA_END);
  41 }
  42
  43 /* IA-64 GNU/Linux specific function which, given a frame address and
  44    a register number, returns the address at which that register may be
  45    found.  0 is returned for registers which aren't stored in the the
  46    sigcontext structure. */
  47
  48 CORE_ADDR
  49 ia64_linux_sigcontext_register_address (CORE_ADDR sp, int regno)
  50 {
  51   char buf[8];
  52   CORE_ADDR sigcontext_addr = 0;
  53
  54   /* The address of the sigcontext area is found at offset 16 in the sigframe.  */
  55   read_memory (sp + 16, buf, 8);
  56   sigcontext_addr = extract_unsigned_integer (buf, 8);
  57
  58   if (IA64_GR0_REGNUM <= regno && regno <= IA64_GR31_REGNUM)
  59     return sigcontext_addr + 200 + 8 * (regno - IA64_GR0_REGNUM);
  60   else if (IA64_BR0_REGNUM <= regno && regno <= IA64_BR7_REGNUM)
  61     return sigcontext_addr + 136 + 8 * (regno - IA64_BR0_REGNUM);
  62   else if (IA64_FR0_REGNUM <= regno && regno <= IA64_FR127_REGNUM)
  63     return sigcontext_addr + 464 + 16 * (regno - IA64_FR0_REGNUM);
  64   else
  65     switch (regno)
  66       {
  67       case IA64_IP_REGNUM :
  68         return sigcontext_addr + 40;
  69       case IA64_CFM_REGNUM :
  70         return sigcontext_addr + 48;
  71       case IA64_PSR_REGNUM :
  72         return sigcontext_addr + 56;            /* user mask only */
  73       /* sc_ar_rsc is provided, from which we could compute bspstore, but
  74          I don't think it's worth it.  Anyway, if we want it, it's at offset
  75          64 */
  76       case IA64_BSP_REGNUM :
  77         return sigcontext_addr + 72;
  78       case IA64_RNAT_REGNUM :
  79         return sigcontext_addr + 80;
  80       case IA64_CCV_REGNUM :
  81         return sigcontext_addr + 88;
  82       case IA64_UNAT_REGNUM :
  83         return sigcontext_addr + 96;
  84       case IA64_FPSR_REGNUM :
  85         return sigcontext_addr + 104;
  86       case IA64_PFS_REGNUM :
  87         return sigcontext_addr + 112;
  88       case IA64_LC_REGNUM :
  89         return sigcontext_addr + 120;
  90       case IA64_PR_REGNUM :
  91         return sigcontext_addr + 128;
  92       default :
  93         return 0;
  94       }
  95 }