gdb/alpha-nat.c

   1 /* Low level Alpha interface, for GDB when running native.
   2    Copyright (C) 1993-2013 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include "defs.h"
  20 #include "gdb_string.h"
  21 #include "inferior.h"
  22 #include "gdbcore.h"
  23 #include "target.h"
  24 #include "procfs.h"
  25 #include "regcache.h"
  26
  27 #include "alpha-tdep.h"
  28
  29 #include <sys/ptrace.h>
  30 #include <alpha/coreregs.h>
  31 #include <sys/user.h>
  32
  33
  34 /* Extract the register values out of the core file and store
  35    them into REGCACHE.
  36
  37    CORE_REG_SECT points to the register values themselves, read into memory.
  38    CORE_REG_SIZE is the size of that area.
  39    WHICH says which set of registers we are handling (0 = int, 2 = float
  40    on machines where they are discontiguous).
  41    REG_ADDR is the offset from u.u_ar0 to the register values relative to
  42    core_reg_sect.  This is used with old-fashioned core files to
  43    locate the registers in a large upage-plus-stack ".reg" section.
  44    Original upage address X is at location core_reg_sect+x+reg_addr.  */
  45
  46 static void
  47 fetch_osf_core_registers (struct regcache *regcache,
  48                           char *core_reg_sect, unsigned core_reg_size,
  49                           int which, CORE_ADDR reg_addr)
  50 {
  51   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  52   int regno;
  53   int addr;
  54   int bad_reg = -1;
  55
  56   /* Table to map a gdb regnum to an index in the core register
  57      section.  The floating point register values are garbage in
  58      OSF/1.2 core files.  OSF5 uses different names for the register
  59      enum list, need to handle two cases.  The actual values are the
  60      same.  */
  61   static int const core_reg_mapping[ALPHA_NUM_REGS] =
  62   {
  63 #ifdef NCF_REGS
  64 #define EFL NCF_REGS
  65     CF_V0, CF_T0, CF_T1, CF_T2, CF_T3, CF_T4, CF_T5, CF_T6,
  66     CF_T7, CF_S0, CF_S1, CF_S2, CF_S3, CF_S4, CF_S5, CF_S6,
  67     CF_A0, CF_A1, CF_A2, CF_A3, CF_A4, CF_A5, CF_T8, CF_T9,
  68     CF_T10, CF_T11, CF_RA, CF_T12, CF_AT, CF_GP, CF_SP, -1,
  69     EFL + 0, EFL + 1, EFL + 2, EFL + 3,
  70     EFL + 4, EFL + 5, EFL + 6, EFL + 7,
  71     EFL + 8, EFL + 9, EFL + 10, EFL + 11,
  72     EFL + 12, EFL + 13, EFL + 14, EFL + 15,
  73     EFL + 16, EFL + 17, EFL + 18, EFL + 19,
  74     EFL + 20, EFL + 21, EFL + 22, EFL + 23,
  75     EFL + 24, EFL + 25, EFL + 26, EFL + 27,
  76     EFL + 28, EFL + 29, EFL + 30, EFL + 31,
  77     CF_PC, -1, -1
  78 #else
  79 #define EFL (EF_SIZE / 8)
  80     EF_V0, EF_T0, EF_T1, EF_T2, EF_T3, EF_T4, EF_T5, EF_T6,
  81     EF_T7, EF_S0, EF_S1, EF_S2, EF_S3, EF_S4, EF_S5, EF_S6,
  82     EF_A0, EF_A1, EF_A2, EF_A3, EF_A4, EF_A5, EF_T8, EF_T9,
  83     EF_T10, EF_T11, EF_RA, EF_T12, EF_AT, EF_GP, EF_SP, -1,
  84     EFL + 0, EFL + 1, EFL + 2, EFL + 3,
  85     EFL + 4, EFL + 5, EFL + 6, EFL + 7,
  86     EFL + 8, EFL + 9, EFL + 10, EFL + 11,
  87     EFL + 12, EFL + 13, EFL + 14, EFL + 15,
  88     EFL + 16, EFL + 17, EFL + 18, EFL + 19,
  89     EFL + 20, EFL + 21, EFL + 22, EFL + 23,
  90     EFL + 24, EFL + 25, EFL + 26, EFL + 27,
  91     EFL + 28, EFL + 29, EFL + 30, EFL + 31,
  92     EF_PC, -1, -1
  93 #endif
  94   };
  95
  96   for (regno = 0; regno < ALPHA_NUM_REGS; regno++)
  97     {
  98       if (gdbarch_cannot_fetch_register (gdbarch, regno))
  99         {
 100           regcache_raw_supply (regcache, regno, NULL);
 101           continue;
 102         }
 103
 104       if (regno == ALPHA_ZERO_REGNUM)
 105         {
 106           const gdb_byte zero[8] = { 0 };
 107
 108           regcache_raw_supply (regcache, regno, zero);
 109           continue;
 110         }
 111
 112       addr = 8 * core_reg_mapping[regno];
 113       if (addr < 0 || addr >= core_reg_size)
 114         {
 115           /* ??? UNIQUE is a new addition.  Don't generate an error.  */
 116           if (regno == ALPHA_UNIQUE_REGNUM)
 117             {
 118               regcache_raw_supply (regcache, regno, NULL);
 119               continue;
 120             }
 121           if (bad_reg < 0)
 122             bad_reg = regno;
 123         }
 124       else
 125         {
 126           regcache_raw_supply (regcache, regno, core_reg_sect + addr);
 127         }
 128     }
 129   if (bad_reg >= 0)
 130     {
 131       error (_("Register %s not found in core file."),
 132              gdbarch_register_name (gdbarch, bad_reg));
 133     }
 134 }
 135
 136
 137 #include <sys/procfs.h>
 138 /* Prototypes for supply_gregset etc.  */
 139 #include "gregset.h"
 140
 141 /* See the comment in m68k-tdep.c regarding the utility of these
 142    functions.  */
 143
 144 void
 145 supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
 146 {
 147   const long *regp = gregsetp->regs;
 148
 149   /* PC is in slot 32.  */
 150   alpha_supply_int_regs (regcache, -1, regp, regp + 31, NULL);
 151 }
 152
 153 void
 154 fill_gregset (const struct regcache *regcache,
 155               gdb_gregset_t *gregsetp, int regno)
 156 {
 157   long *regp = gregsetp->regs;
 158
 159   /* PC is in slot 32.  */
 160   alpha_fill_int_regs (regcache, regno, regp, regp + 31, NULL);
 161 }
 162
 163 /* Now we do the same thing for floating-point registers.
 164    Again, see the comments in m68k-tdep.c.  */
 165
 166 void
 167 supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
 168 {
 169   const long *regp = fpregsetp->regs;
 170
 171   /* FPCR is in slot 32.  */
 172   alpha_supply_fp_regs (regcache, -1, regp, regp + 31);
 173 }
 174
 175 void
 176 fill_fpregset (const struct regcache *regcache,
 177                gdb_fpregset_t *fpregsetp, int regno)
 178 {
 179   long *regp = fpregsetp->regs;
 180
 181   /* FPCR is in slot 32.  */
 182   alpha_fill_fp_regs (regcache, regno, regp, regp + 31);
 183 }
 184 \f
 185
 186 /* Register that we are able to handle alpha core file formats.  */
 187
 188 static struct core_fns alpha_osf_core_fns =
 189 {
 190   /* This really is bfd_target_unknown_flavour.  */
 191
 192   bfd_target_unknown_flavour,           /* core_flavour */
 193   default_check_format,                 /* check_format */
 194   default_core_sniffer,                 /* core_sniffer */
 195   fetch_osf_core_registers,             /* core_read_registers */
 196   NULL                                  /* next */
 197 };
 198
 199 /* Provide a prototype to silence -Wmissing-prototypes.  */
 200 extern initialize_file_ftype _initialize_alpha_nat;
 201
 202 void
 203 _initialize_alpha_nat (void)
 204 {
 205   struct target_ops *t;
 206
 207   t = procfs_target ();
 208   add_target (t);
 209
 210   deprecated_add_core_fns (&alpha_osf_core_fns);
 211 }