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 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., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, USA.  */
  21
  22 #include "defs.h"
  23 #include "gdb_string.h"
  24 #include "inferior.h"
  25 #include "gdbcore.h"
  26 #include "target.h"
  27 #include "regcache.h"
  28
  29 #include "alpha-tdep.h"
  30
  31 #include <sys/ptrace.h>
  32 #include <alpha/coreregs.h>
  33 #include <sys/user.h>
  34
  35
  36 /* Extract the register values out of the core file and store
  37    them where `read_register' will find them.
  38
  39    CORE_REG_SECT points to the register values themselves, read into memory.
  40    CORE_REG_SIZE is the size of that area.
  41    WHICH says which set of registers we are handling (0 = int, 2 = float
  42    on machines where they are discontiguous).
  43    REG_ADDR is the offset from u.u_ar0 to the register values relative to
  44    core_reg_sect.  This is used with old-fashioned core files to
  45    locate the registers in a large upage-plus-stack ".reg" section.
  46    Original upage address X is at location core_reg_sect+x+reg_addr.
  47  */
  48
  49 static void
  50 fetch_osf_core_registers (char *core_reg_sect, unsigned core_reg_size,
  51                           int which, CORE_ADDR reg_addr)
  52 {
  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, EFL + 4, EFL + 5, EFL + 6, EFL + 7,
  71     EFL + 8, EFL + 9, EFL + 10, EFL + 11, EFL + 12, EFL + 13, EFL + 14, EFL + 15,
  72     EFL + 16, EFL + 17, EFL + 18, EFL + 19, EFL + 20, EFL + 21, EFL + 22, EFL + 23,
  73     EFL + 24, EFL + 25, EFL + 26, EFL + 27, EFL + 28, EFL + 29, EFL + 30, EFL + 31,
  74     CF_PC, -1, -1
  75 #else
  76 #define EFL (EF_SIZE / 8)
  77     EF_V0, EF_T0, EF_T1, EF_T2, EF_T3, EF_T4, EF_T5, EF_T6,
  78     EF_T7, EF_S0, EF_S1, EF_S2, EF_S3, EF_S4, EF_S5, EF_S6,
  79     EF_A0, EF_A1, EF_A2, EF_A3, EF_A4, EF_A5, EF_T8, EF_T9,
  80     EF_T10, EF_T11, EF_RA, EF_T12, EF_AT, EF_GP, EF_SP, -1,
  81     EFL + 0, EFL + 1, EFL + 2, EFL + 3, EFL + 4, EFL + 5, EFL + 6, EFL + 7,
  82     EFL + 8, EFL + 9, EFL + 10, EFL + 11, EFL + 12, EFL + 13, EFL + 14, EFL + 15,
  83     EFL + 16, EFL + 17, EFL + 18, EFL + 19, EFL + 20, EFL + 21, EFL + 22, EFL + 23,
  84     EFL + 24, EFL + 25, EFL + 26, EFL + 27, EFL + 28, EFL + 29, EFL + 30, EFL + 31,
  85     EF_PC, -1, -1
  86 #endif
  87   };
  88
  89   for (regno = 0; regno < ALPHA_NUM_REGS; regno++)
  90     {
  91       if (CANNOT_FETCH_REGISTER (regno))
  92         {
  93           regcache_raw_supply (current_regcache, regno, NULL);
  94           continue;
  95         }
  96       addr = 8 * core_reg_mapping[regno];
  97       if (addr < 0 || addr >= core_reg_size)
  98         {
  99           /* ??? UNIQUE is a new addition.  Don't generate an error.  */
 100           if (regno == ALPHA_UNIQUE_REGNUM)
 101             {
 102               regcache_raw_supply (current_regcache, regno, NULL);
 103               continue;
 104             }
 105           if (bad_reg < 0)
 106             bad_reg = regno;
 107         }
 108       else
 109         {
 110           regcache_raw_supply (current_regcache, regno, core_reg_sect + addr);
 111         }
 112     }
 113   if (bad_reg >= 0)
 114     {
 115       error (_("Register %s not found in core file."), REGISTER_NAME (bad_reg));
 116     }
 117 }
 118
 119
 120 /* Map gdb internal register number to a ptrace ``address''.
 121    These ``addresses'' are defined in <sys/ptrace.h>, with
 122    the exception of ALPHA_UNIQUE_PTRACE_ADDR.  */
 123
 124 #define ALPHA_UNIQUE_PTRACE_ADDR 0
 125
 126 CORE_ADDR
 127 register_addr (int regno, CORE_ADDR blockend)
 128 {
 129   if (regno == PC_REGNUM)
 130     return PC;
 131   if (regno == ALPHA_UNIQUE_REGNUM)
 132     return ALPHA_UNIQUE_PTRACE_ADDR;
 133   if (regno < FP0_REGNUM)
 134     return GPR_BASE + regno;
 135   else
 136     return FPR_BASE + regno - FP0_REGNUM;
 137 }
 138
 139 int
 140 kernel_u_size (void)
 141 {
 142   return (sizeof (struct user));
 143 }
 144
 145 #if defined(USE_PROC_FS) || defined(HAVE_GREGSET_T)
 146 #include <sys/procfs.h>
 147
 148 /* Prototypes for supply_gregset etc. */
 149 #include "gregset.h"
 150
 151 /*
 152  * See the comment in m68k-tdep.c regarding the utility of these functions.
 153  */
 154
 155 void
 156 supply_gregset (gdb_gregset_t *gregsetp)
 157 {
 158   long *regp = gregsetp->regs;
 159
 160   /* PC is in slot 32.  */
 161   alpha_supply_int_regs (current_regcache, -1, regp, regp + 31, NULL);
 162 }
 163
 164 void
 165 fill_gregset (gdb_gregset_t *gregsetp, int regno)
 166 {
 167   long *regp = gregsetp->regs;
 168
 169   /* PC is in slot 32.  */
 170   alpha_fill_int_regs (current_regcache, regno, regp, regp + 31, NULL);
 171 }
 172
 173 /*
 174  * Now we do the same thing for floating-point registers.
 175  * Again, see the comments in m68k-tdep.c.
 176  */
 177
 178 void
 179 supply_fpregset (gdb_fpregset_t *fpregsetp)
 180 {
 181   long *regp = fpregsetp->regs;
 182
 183   /* FPCR is in slot 32.  */
 184   alpha_supply_fp_regs (current_regcache, -1, regp, regp + 31);
 185 }
 186
 187 void
 188 fill_fpregset (gdb_fpregset_t *fpregsetp, int regno)
 189 {
 190   long *regp = fpregsetp->regs;
 191
 192   /* FPCR is in slot 32.  */
 193   alpha_fill_fp_regs (current_regcache, regno, regp, regp + 31);
 194 }
 195 #endif
 196 \f
 197
 198 /* Register that we are able to handle alpha core file formats. */
 199
 200 static struct core_fns alpha_osf_core_fns =
 201 {
 202   /* This really is bfd_target_unknown_flavour.  */
 203
 204   bfd_target_unknown_flavour,           /* core_flavour */
 205   default_check_format,                 /* check_format */
 206   default_core_sniffer,                 /* core_sniffer */
 207   fetch_osf_core_registers,             /* core_read_registers */
 208   NULL                                  /* next */
 209 };
 210
 211 void
 212 _initialize_core_alpha (void)
 213 {
 214   deprecated_add_core_fns (&alpha_osf_core_fns);
 215 }