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
   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 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 "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
  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   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, EFL + 4, EFL + 5, EFL + 6, EFL + 7,
  70     EFL + 8, EFL + 9, EFL + 10, EFL + 11, EFL + 12, EFL + 13, EFL + 14, EFL + 15,
  71     EFL + 16, EFL + 17, EFL + 18, EFL + 19, EFL + 20, EFL + 21, EFL + 22, EFL + 23,
  72     EFL + 24, EFL + 25, EFL + 26, EFL + 27, EFL + 28, EFL + 29, EFL + 30, EFL + 31,
  73     CF_PC, -1, -1
  74 #else
  75 #define EFL (EF_SIZE / 8)
  76     EF_V0, EF_T0, EF_T1, EF_T2, EF_T3, EF_T4, EF_T5, EF_T6,
  77     EF_T7, EF_S0, EF_S1, EF_S2, EF_S3, EF_S4, EF_S5, EF_S6,
  78     EF_A0, EF_A1, EF_A2, EF_A3, EF_A4, EF_A5, EF_T8, EF_T9,
  79     EF_T10, EF_T11, EF_RA, EF_T12, EF_AT, EF_GP, EF_SP, -1,
  80     EFL + 0, EFL + 1, EFL + 2, EFL + 3, EFL + 4, EFL + 5, EFL + 6, EFL + 7,
  81     EFL + 8, EFL + 9, EFL + 10, EFL + 11, EFL + 12, EFL + 13, EFL + 14, EFL + 15,
  82     EFL + 16, EFL + 17, EFL + 18, EFL + 19, EFL + 20, EFL + 21, EFL + 22, EFL + 23,
  83     EFL + 24, EFL + 25, EFL + 26, EFL + 27, EFL + 28, EFL + 29, EFL + 30, EFL + 31,
  84     EF_PC, -1, -1
  85 #endif
  86   };
  87
  88   for (regno = 0; regno < ALPHA_NUM_REGS; regno++)
  89     {
  90       if (gdbarch_cannot_fetch_register (current_gdbarch, regno))
  91         {
  92           regcache_raw_supply (regcache, regno, NULL);
  93           continue;
  94         }
  95       addr = 8 * core_reg_mapping[regno];
  96       if (addr < 0 || addr >= core_reg_size)
  97         {
  98           /* ??? UNIQUE is a new addition.  Don't generate an error.  */
  99           if (regno == ALPHA_UNIQUE_REGNUM)
 100             {
 101               regcache_raw_supply (regcache, regno, NULL);
 102               continue;
 103             }
 104           if (bad_reg < 0)
 105             bad_reg = regno;
 106         }
 107       else
 108         {
 109           regcache_raw_supply (regcache, regno, core_reg_sect + addr);
 110         }
 111     }
 112   if (bad_reg >= 0)
 113     {
 114       error (_("Register %s not found in core file."),
 115              gdbarch_register_name (current_gdbarch, bad_reg));
 116     }
 117 }
 118
 119
 120 #include <sys/procfs.h>
 121 /* Prototypes for supply_gregset etc. */
 122 #include "gregset.h"
 123
 124 /*
 125  * See the comment in m68k-tdep.c regarding the utility of these functions.
 126  */
 127
 128 void
 129 supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
 130 {
 131   const long *regp = gregsetp->regs;
 132
 133   /* PC is in slot 32.  */
 134   alpha_supply_int_regs (regcache, -1, regp, regp + 31, NULL);
 135 }
 136
 137 void
 138 fill_gregset (const struct regcache *regcache,
 139               gdb_gregset_t *gregsetp, int regno)
 140 {
 141   long *regp = gregsetp->regs;
 142
 143   /* PC is in slot 32.  */
 144   alpha_fill_int_regs (regcache, regno, regp, regp + 31, NULL);
 145 }
 146
 147 /*
 148  * Now we do the same thing for floating-point registers.
 149  * Again, see the comments in m68k-tdep.c.
 150  */
 151
 152 void
 153 supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
 154 {
 155   const long *regp = fpregsetp->regs;
 156
 157   /* FPCR is in slot 32.  */
 158   alpha_supply_fp_regs (regcache, -1, regp, regp + 31);
 159 }
 160
 161 void
 162 fill_fpregset (const struct regcache *regcache,
 163                gdb_fpregset_t *fpregsetp, int regno)
 164 {
 165   long *regp = fpregsetp->regs;
 166
 167   /* FPCR is in slot 32.  */
 168   alpha_fill_fp_regs (regcache, regno, regp, regp + 31);
 169 }
 170 \f
 171
 172 /* Register that we are able to handle alpha core file formats. */
 173
 174 static struct core_fns alpha_osf_core_fns =
 175 {
 176   /* This really is bfd_target_unknown_flavour.  */
 177
 178   bfd_target_unknown_flavour,           /* core_flavour */
 179   default_check_format,                 /* check_format */
 180   default_core_sniffer,                 /* core_sniffer */
 181   fetch_osf_core_registers,             /* core_read_registers */
 182   NULL                                  /* next */
 183 };
 184
 185 void
 186 _initialize_core_alpha (void)
 187 {
 188   deprecated_add_core_fns (&alpha_osf_core_fns);
 189 }