gdb/alpha-nat.c

   1 /* Low level Alpha interface, for GDB when running native.
   2    Copyright (C) 1993, 1995, 1996, 1998, 1999, 2000, 2001, 2003, 2007, 2008,
   3    2009, 2010, 2011 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 3 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, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "gdb_string.h"
  22 #include "inferior.h"
  23 #include "gdbcore.h"
  24 #include "target.h"
  25 #include "procfs.h"
  26 #include "regcache.h"
  27
  28 #include "alpha-tdep.h"
  29
  30 #include <sys/ptrace.h>
  31 #include <alpha/coreregs.h>
  32 #include <sys/user.h>
  33
  34
  35 /* Extract the register values out of the core file and store
  36    them into REGCACHE.
  37
  38    CORE_REG_SECT points to the register values themselves, read into memory.
  39    CORE_REG_SIZE is the size of that area.
  40    WHICH says which set of registers we are handling (0 = int, 2 = float
  41    on machines where they are discontiguous).
  42    REG_ADDR is the offset from u.u_ar0 to the register values relative to
  43    core_reg_sect.  This is used with old-fashioned core files to
  44    locate the registers in a large upage-plus-stack ".reg" section.
  45    Original upage address X is at location core_reg_sect+x+reg_addr.  */
  46
  47 static void
  48 fetch_osf_core_registers (struct regcache *regcache,
  49                           char *core_reg_sect, unsigned core_reg_size,
  50                           int which, CORE_ADDR reg_addr)
  51 {
  52   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  53   int regno;
  54   int addr;
  55   int bad_reg = -1;
  56
  57   /* Table to map a gdb regnum to an index in the core register
  58      section.  The floating point register values are garbage in
  59      OSF/1.2 core files.  OSF5 uses different names for the register
  60      enum list, need to handle two cases.  The actual values are the
  61      same.  */
  62   static int const core_reg_mapping[ALPHA_NUM_REGS] =
  63   {
  64 #ifdef NCF_REGS
  65 #define EFL NCF_REGS
  66     CF_V0, CF_T0, CF_T1, CF_T2, CF_T3, CF_T4, CF_T5, CF_T6,
  67     CF_T7, CF_S0, CF_S1, CF_S2, CF_S3, CF_S4, CF_S5, CF_S6,
  68     CF_A0, CF_A1, CF_A2, CF_A3, CF_A4, CF_A5, CF_T8, CF_T9,
  69     CF_T10, CF_T11, CF_RA, CF_T12, CF_AT, CF_GP, CF_SP, -1,
  70     EFL + 0, EFL + 1, EFL + 2, EFL + 3,
  71     EFL + 4, EFL + 5, EFL + 6, EFL + 7,
  72     EFL + 8, EFL + 9, EFL + 10, EFL + 11,
  73     EFL + 12, EFL + 13, EFL + 14, EFL + 15,
  74     EFL + 16, EFL + 17, EFL + 18, EFL + 19,
  75     EFL + 20, EFL + 21, EFL + 22, EFL + 23,
  76     EFL + 24, EFL + 25, EFL + 26, EFL + 27,
  77     EFL + 28, EFL + 29, EFL + 30, EFL + 31,
  78     CF_PC, -1, -1
  79 #else
  80 #define EFL (EF_SIZE / 8)
  81     EF_V0, EF_T0, EF_T1, EF_T2, EF_T3, EF_T4, EF_T5, EF_T6,
  82     EF_T7, EF_S0, EF_S1, EF_S2, EF_S3, EF_S4, EF_S5, EF_S6,
  83     EF_A0, EF_A1, EF_A2, EF_A3, EF_A4, EF_A5, EF_T8, EF_T9,
  84     EF_T10, EF_T11, EF_RA, EF_T12, EF_AT, EF_GP, EF_SP, -1,
  85     EFL + 0, EFL + 1, EFL + 2, EFL + 3,
  86     EFL + 4, EFL + 5, EFL + 6, EFL + 7,
  87     EFL + 8, EFL + 9, EFL + 10, EFL + 11,
  88     EFL + 12, EFL + 13, EFL + 14, EFL + 15,
  89     EFL + 16, EFL + 17, EFL + 18, EFL + 19,
  90     EFL + 20, EFL + 21, EFL + 22, EFL + 23,
  91     EFL + 24, EFL + 25, EFL + 26, EFL + 27,
  92     EFL + 28, EFL + 29, EFL + 30, EFL + 31,
  93     EF_PC, -1, -1
  94 #endif
  95   };
  96
  97   for (regno = 0; regno < ALPHA_NUM_REGS; regno++)
  98     {
  99       if (gdbarch_cannot_fetch_register (gdbarch, regno))
 100         {
 101           regcache_raw_supply (regcache, regno, NULL);
 102           continue;
 103         }
 104       addr = 8 * core_reg_mapping[regno];
 105       if (addr < 0 || addr >= core_reg_size)
 106         {
 107           /* ??? UNIQUE is a new addition.  Don't generate an error.  */
 108           if (regno == ALPHA_UNIQUE_REGNUM)
 109             {
 110               regcache_raw_supply (regcache, regno, NULL);
 111               continue;
 112             }
 113           if (bad_reg < 0)
 114             bad_reg = regno;
 115         }
 116       else
 117         {
 118           regcache_raw_supply (regcache, regno, core_reg_sect + addr);
 119         }
 120     }
 121   if (bad_reg >= 0)
 122     {
 123       error (_("Register %s not found in core file."),
 124              gdbarch_register_name (gdbarch, bad_reg));
 125     }
 126 }
 127
 128
 129 #include <sys/procfs.h>
 130 /* Prototypes for supply_gregset etc.  */
 131 #include "gregset.h"
 132
 133 /* See the comment in m68k-tdep.c regarding the utility of these
 134    functions.  */
 135
 136 void
 137 supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
 138 {
 139   const long *regp = gregsetp->regs;
 140
 141   /* PC is in slot 32.  */
 142   alpha_supply_int_regs (regcache, -1, regp, regp + 31, NULL);
 143 }
 144
 145 void
 146 fill_gregset (const struct regcache *regcache,
 147               gdb_gregset_t *gregsetp, int regno)
 148 {
 149   long *regp = gregsetp->regs;
 150
 151   /* PC is in slot 32.  */
 152   alpha_fill_int_regs (regcache, regno, regp, regp + 31, NULL);
 153 }
 154
 155 /* Now we do the same thing for floating-point registers.
 156    Again, see the comments in m68k-tdep.c.  */
 157
 158 void
 159 supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
 160 {
 161   const long *regp = fpregsetp->regs;
 162
 163   /* FPCR is in slot 32.  */
 164   alpha_supply_fp_regs (regcache, -1, regp, regp + 31);
 165 }
 166
 167 void
 168 fill_fpregset (const struct regcache *regcache,
 169                gdb_fpregset_t *fpregsetp, int regno)
 170 {
 171   long *regp = fpregsetp->regs;
 172
 173   /* FPCR is in slot 32.  */
 174   alpha_fill_fp_regs (regcache, regno, regp, regp + 31);
 175 }
 176 \f
 177
 178 /* Register that we are able to handle alpha core file formats.  */
 179
 180 static struct core_fns alpha_osf_core_fns =
 181 {
 182   /* This really is bfd_target_unknown_flavour.  */
 183
 184   bfd_target_unknown_flavour,           /* core_flavour */
 185   default_check_format,                 /* check_format */
 186   default_core_sniffer,                 /* core_sniffer */
 187   fetch_osf_core_registers,             /* core_read_registers */
 188   NULL                                  /* next */
 189 };
 190
 191 /* Provide a prototype to silence -Wmissing-prototypes.  */
 192 extern initialize_file_ftype _initialize_alpha_nat;
 193
 194 void
 195 _initialize_alpha_nat (void)
 196 {
 197   struct target_ops *t;
 198
 199   t = procfs_target ();
 200   add_target (t);
 201
 202   deprecated_add_core_fns (&alpha_osf_core_fns);
 203 }