gdb/alpha-nat.c

   1 /* Low level Alpha interface, for GDB when running native.
   2    Copyright (C) 1993-2014 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 "inferior.h"
  21 #include "gdbcore.h"
  22 #include "target.h"
  23 #include "procfs.h"
  24 #include "regcache.h"
  25
  26 #include "alpha-tdep.h"
  27
  28 #include <sys/ptrace.h>
  29 #include <alpha/coreregs.h>
  30 #include <sys/user.h>
  31
  32
  33 /* Extract the register values out of the core file and store
  34    them into REGCACHE.
  35
  36    CORE_REG_SECT points to the register values themselves, read into memory.
  37    CORE_REG_SIZE is the size of that area.
  38    WHICH says which set of registers we are handling (0 = int, 2 = float
  39    on machines where they are discontiguous).
  40    REG_ADDR is the offset from u.u_ar0 to the register values relative to
  41    core_reg_sect.  This is used with old-fashioned core files to
  42    locate the registers in a large upage-plus-stack ".reg" section.
  43    Original upage address X is at location core_reg_sect+x+reg_addr.  */
  44
  45 static void
  46 fetch_osf_core_registers (struct regcache *regcache,
  47                           char *core_reg_sect, unsigned core_reg_size,
  48                           int which, CORE_ADDR reg_addr)
  49 {
  50   struct gdbarch *gdbarch = get_regcache_arch (regcache);
  51   int regno;
  52   int addr;
  53   int bad_reg = -1;
  54
  55   /* Table to map a gdb regnum to an index in the core register
  56      section.  The floating point register values are garbage in
  57      OSF/1.2 core files.  OSF5 uses different names for the register
  58      enum list, need to handle two cases.  The actual values are the
  59      same.  */
  60   static int const core_reg_mapping[ALPHA_NUM_REGS] =
  61   {
  62 #ifdef NCF_REGS
  63 #define EFL NCF_REGS
  64     CF_V0, CF_T0, CF_T1, CF_T2, CF_T3, CF_T4, CF_T5, CF_T6,
  65     CF_T7, CF_S0, CF_S1, CF_S2, CF_S3, CF_S4, CF_S5, CF_S6,
  66     CF_A0, CF_A1, CF_A2, CF_A3, CF_A4, CF_A5, CF_T8, CF_T9,
  67     CF_T10, CF_T11, CF_RA, CF_T12, CF_AT, CF_GP, CF_SP, -1,
  68     EFL + 0, EFL + 1, EFL + 2, EFL + 3,
  69     EFL + 4, EFL + 5, EFL + 6, EFL + 7,
  70     EFL + 8, EFL + 9, EFL + 10, EFL + 11,
  71     EFL + 12, EFL + 13, EFL + 14, EFL + 15,
  72     EFL + 16, EFL + 17, EFL + 18, EFL + 19,
  73     EFL + 20, EFL + 21, EFL + 22, EFL + 23,
  74     EFL + 24, EFL + 25, EFL + 26, EFL + 27,
  75     EFL + 28, EFL + 29, EFL + 30, EFL + 31,
  76     CF_PC, -1, -1
  77 #else
  78 #define EFL (EF_SIZE / 8)
  79     EF_V0, EF_T0, EF_T1, EF_T2, EF_T3, EF_T4, EF_T5, EF_T6,
  80     EF_T7, EF_S0, EF_S1, EF_S2, EF_S3, EF_S4, EF_S5, EF_S6,
  81     EF_A0, EF_A1, EF_A2, EF_A3, EF_A4, EF_A5, EF_T8, EF_T9,
  82     EF_T10, EF_T11, EF_RA, EF_T12, EF_AT, EF_GP, EF_SP, -1,
  83     EFL + 0, EFL + 1, EFL + 2, EFL + 3,
  84     EFL + 4, EFL + 5, EFL + 6, EFL + 7,
  85     EFL + 8, EFL + 9, EFL + 10, EFL + 11,
  86     EFL + 12, EFL + 13, EFL + 14, EFL + 15,
  87     EFL + 16, EFL + 17, EFL + 18, EFL + 19,
  88     EFL + 20, EFL + 21, EFL + 22, EFL + 23,
  89     EFL + 24, EFL + 25, EFL + 26, EFL + 27,
  90     EFL + 28, EFL + 29, EFL + 30, EFL + 31,
  91     EF_PC, -1, -1
  92 #endif
  93   };
  94
  95   for (regno = 0; regno < ALPHA_NUM_REGS; regno++)
  96     {
  97       if (gdbarch_cannot_fetch_register (gdbarch, regno))
  98         {
  99           regcache_raw_supply (regcache, regno, NULL);
 100           continue;
 101         }
 102
 103       if (regno == ALPHA_ZERO_REGNUM)
 104         {
 105           const gdb_byte zero[8] = { 0 };
 106
 107           regcache_raw_supply (regcache, regno, zero);
 108           continue;
 109         }
 110
 111       addr = 8 * core_reg_mapping[regno];
 112       if (addr < 0 || addr >= core_reg_size)
 113         {
 114           /* ??? UNIQUE is a new addition.  Don't generate an error.  */
 115           if (regno == ALPHA_UNIQUE_REGNUM)
 116             {
 117               regcache_raw_supply (regcache, regno, NULL);
 118               continue;
 119             }
 120           if (bad_reg < 0)
 121             bad_reg = regno;
 122         }
 123       else
 124         {
 125           regcache_raw_supply (regcache, regno, core_reg_sect + addr);
 126         }
 127     }
 128   if (bad_reg >= 0)
 129     {
 130       error (_("Register %s not found in core file."),
 131              gdbarch_register_name (gdbarch, bad_reg));
 132     }
 133 }
 134
 135
 136 #include <sys/procfs.h>
 137 /* Prototypes for supply_gregset etc.  */
 138 #include "gregset.h"
 139
 140 /* See the comment in m68k-tdep.c regarding the utility of these
 141    functions.  */
 142
 143 void
 144 supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
 145 {
 146   const long *regp = gregsetp->regs;
 147
 148   /* PC is in slot 32.  */
 149   alpha_supply_int_regs (regcache, -1, regp, regp + 31, NULL);
 150 }
 151
 152 void
 153 fill_gregset (const struct regcache *regcache,
 154               gdb_gregset_t *gregsetp, int regno)
 155 {
 156   long *regp = gregsetp->regs;
 157
 158   /* PC is in slot 32.  */
 159   alpha_fill_int_regs (regcache, regno, regp, regp + 31, NULL);
 160 }
 161
 162 /* Now we do the same thing for floating-point registers.
 163    Again, see the comments in m68k-tdep.c.  */
 164
 165 void
 166 supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
 167 {
 168   const long *regp = fpregsetp->regs;
 169
 170   /* FPCR is in slot 32.  */
 171   alpha_supply_fp_regs (regcache, -1, regp, regp + 31);
 172 }
 173
 174 void
 175 fill_fpregset (const struct regcache *regcache,
 176                gdb_fpregset_t *fpregsetp, int regno)
 177 {
 178   long *regp = fpregsetp->regs;
 179
 180   /* FPCR is in slot 32.  */
 181   alpha_fill_fp_regs (regcache, regno, regp, regp + 31);
 182 }
 183 \f
 184
 185 /* Register that we are able to handle alpha core file formats.  */
 186
 187 static struct core_fns alpha_osf_core_fns =
 188 {
 189   /* This really is bfd_target_unknown_flavour.  */
 190
 191   bfd_target_unknown_flavour,           /* core_flavour */
 192   default_check_format,                 /* check_format */
 193   default_core_sniffer,                 /* core_sniffer */
 194   fetch_osf_core_registers,             /* core_read_registers */
 195   NULL                                  /* next */
 196 };
 197
 198 /* Provide a prototype to silence -Wmissing-prototypes.  */
 199 extern initialize_file_ftype _initialize_alpha_nat;
 200
 201 void
 202 _initialize_alpha_nat (void)
 203 {
 204   struct target_ops *t;
 205
 206   t = procfs_target ();
 207   add_target (t);
 208
 209   deprecated_add_core_fns (&alpha_osf_core_fns);
 210 }