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
   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 #ifdef __linux__
  33 #include <asm/reg.h>
  34 #include <alpha/ptrace.h>
  35 #else
  36 #include <alpha/coreregs.h>
  37 #endif
  38 #include <sys/user.h>
  39
  40 /* Prototypes for local functions. */
  41
  42 static void fetch_osf_core_registers (char *, unsigned, int, CORE_ADDR);
  43 static void fetch_elf_core_registers (char *, unsigned, int, CORE_ADDR);
  44
  45 /* Extract the register values out of the core file and store
  46    them where `read_register' will find them.
  47
  48    CORE_REG_SECT points to the register values themselves, read into memory.
  49    CORE_REG_SIZE is the size of that area.
  50    WHICH says which set of registers we are handling (0 = int, 2 = float
  51    on machines where they are discontiguous).
  52    REG_ADDR is the offset from u.u_ar0 to the register values relative to
  53    core_reg_sect.  This is used with old-fashioned core files to
  54    locate the registers in a large upage-plus-stack ".reg" section.
  55    Original upage address X is at location core_reg_sect+x+reg_addr.
  56  */
  57
  58 static void
  59 fetch_osf_core_registers (char *core_reg_sect, unsigned core_reg_size,
  60                           int which, CORE_ADDR reg_addr)
  61 {
  62   int regno;
  63   int addr;
  64   int bad_reg = -1;
  65
  66   /* Table to map a gdb regnum to an index in the core register
  67      section.  The floating point register values are garbage in
  68      OSF/1.2 core files.  OSF5 uses different names for the register
  69      enum list, need to handle two cases.  The actual values are the
  70      same.  */
  71   static int const core_reg_mapping[ALPHA_NUM_REGS] =
  72   {
  73 #ifdef NCF_REGS
  74 #define EFL NCF_REGS
  75     CF_V0, CF_T0, CF_T1, CF_T2, CF_T3, CF_T4, CF_T5, CF_T6,
  76     CF_T7, CF_S0, CF_S1, CF_S2, CF_S3, CF_S4, CF_S5, CF_S6,
  77     CF_A0, CF_A1, CF_A2, CF_A3, CF_A4, CF_A5, CF_T8, CF_T9,
  78     CF_T10, CF_T11, CF_RA, CF_T12, CF_AT, CF_GP, CF_SP, -1,
  79     EFL + 0, EFL + 1, EFL + 2, EFL + 3, EFL + 4, EFL + 5, EFL + 6, EFL + 7,
  80     EFL + 8, EFL + 9, EFL + 10, EFL + 11, EFL + 12, EFL + 13, EFL + 14, EFL + 15,
  81     EFL + 16, EFL + 17, EFL + 18, EFL + 19, EFL + 20, EFL + 21, EFL + 22, EFL + 23,
  82     EFL + 24, EFL + 25, EFL + 26, EFL + 27, EFL + 28, EFL + 29, EFL + 30, EFL + 31,
  83     CF_PC, -1, -1
  84 #else
  85 #define EFL (EF_SIZE / 8)
  86     EF_V0, EF_T0, EF_T1, EF_T2, EF_T3, EF_T4, EF_T5, EF_T6,
  87     EF_T7, EF_S0, EF_S1, EF_S2, EF_S3, EF_S4, EF_S5, EF_S6,
  88     EF_A0, EF_A1, EF_A2, EF_A3, EF_A4, EF_A5, EF_T8, EF_T9,
  89     EF_T10, EF_T11, EF_RA, EF_T12, EF_AT, EF_GP, EF_SP, -1,
  90     EFL + 0, EFL + 1, EFL + 2, EFL + 3, EFL + 4, EFL + 5, EFL + 6, EFL + 7,
  91     EFL + 8, EFL + 9, EFL + 10, EFL + 11, EFL + 12, EFL + 13, EFL + 14, EFL + 15,
  92     EFL + 16, EFL + 17, EFL + 18, EFL + 19, EFL + 20, EFL + 21, EFL + 22, EFL + 23,
  93     EFL + 24, EFL + 25, EFL + 26, EFL + 27, EFL + 28, EFL + 29, EFL + 30, EFL + 31,
  94     EF_PC, -1, -1
  95 #endif
  96   };
  97
  98   for (regno = 0; regno < ALPHA_NUM_REGS; regno++)
  99     {
 100       if (CANNOT_FETCH_REGISTER (regno))
 101         {
 102           regcache_raw_supply (current_regcache, regno, NULL);
 103           continue;
 104         }
 105       addr = 8 * core_reg_mapping[regno];
 106       if (addr < 0 || addr >= core_reg_size)
 107         {
 108           /* ??? UNIQUE is a new addition.  Don't generate an error.  */
 109           if (regno == ALPHA_UNIQUE_REGNUM)
 110             {
 111               regcache_raw_supply (current_regcache, regno, NULL);
 112               continue;
 113             }
 114           if (bad_reg < 0)
 115             bad_reg = regno;
 116         }
 117       else
 118         {
 119           regcache_raw_supply (current_regcache, regno, core_reg_sect + addr);
 120         }
 121     }
 122   if (bad_reg >= 0)
 123     {
 124       error (_("Register %s not found in core file."), REGISTER_NAME (bad_reg));
 125     }
 126 }
 127
 128 static void
 129 fetch_elf_core_registers (char *core_reg_sect, unsigned core_reg_size,
 130                           int which, CORE_ADDR reg_addr)
 131 {
 132   if (core_reg_size < 32 * 8)
 133     {
 134       error (_("Core file register section too small (%u bytes)."), core_reg_size);
 135       return;
 136     }
 137
 138   switch (which)
 139     {
 140     case 0: /* integer registers */
 141       /* PC is in slot 32; UNIQUE is in slot 33, if present.  */
 142       alpha_supply_int_regs (-1, core_reg_sect, core_reg_sect + 31*8,
 143                              (core_reg_size >= 33 * 8
 144                               ? core_reg_sect + 32*8 : NULL));
 145       break;
 146
 147     case 2: /* floating-point registers */
 148       /* FPCR is in slot 32.  */
 149       alpha_supply_fp_regs (-1, core_reg_sect, core_reg_sect + 31*8);
 150       break;
 151
 152     default:
 153       break;
 154     }
 155 }
 156
 157
 158 /* Map gdb internal register number to a ptrace ``address''.
 159    These ``addresses'' are defined in <sys/ptrace.h>, with
 160    the exception of ALPHA_UNIQUE_PTRACE_ADDR.  */
 161
 162 #ifndef ALPHA_UNIQUE_PTRACE_ADDR
 163 #define ALPHA_UNIQUE_PTRACE_ADDR 0
 164 #endif
 165
 166 CORE_ADDR
 167 register_addr (int regno, CORE_ADDR blockend)
 168 {
 169   if (regno == PC_REGNUM)
 170     return PC;
 171   if (regno == ALPHA_UNIQUE_REGNUM)
 172     return ALPHA_UNIQUE_PTRACE_ADDR;
 173   if (regno < FP0_REGNUM)
 174     return GPR_BASE + regno;
 175   else
 176     return FPR_BASE + regno - FP0_REGNUM;
 177 }
 178
 179 int
 180 kernel_u_size (void)
 181 {
 182   return (sizeof (struct user));
 183 }
 184
 185 #if defined(USE_PROC_FS) || defined(HAVE_GREGSET_T)
 186 #include <sys/procfs.h>
 187
 188 /* Prototypes for supply_gregset etc. */
 189 #include "gregset.h"
 190
 191 /* Locate the UNIQUE value within the gregset_t.  */
 192 #ifndef ALPHA_REGSET_UNIQUE
 193 #define ALPHA_REGSET_UNIQUE(ptr) NULL
 194 #endif
 195
 196 /*
 197  * See the comment in m68k-tdep.c regarding the utility of these functions.
 198  */
 199
 200 void
 201 supply_gregset (gdb_gregset_t *gregsetp)
 202 {
 203   long *regp = ALPHA_REGSET_BASE (gregsetp);
 204   void *unique = ALPHA_REGSET_UNIQUE (gregsetp);
 205
 206   /* PC is in slot 32.  */
 207   alpha_supply_int_regs (-1, regp, regp + 31, unique);
 208 }
 209
 210 void
 211 fill_gregset (gdb_gregset_t *gregsetp, int regno)
 212 {
 213   long *regp = ALPHA_REGSET_BASE (gregsetp);
 214   void *unique = ALPHA_REGSET_UNIQUE (gregsetp);
 215
 216   /* PC is in slot 32.  */
 217   alpha_fill_int_regs (regno, regp, regp + 31, unique);
 218 }
 219
 220 /*
 221  * Now we do the same thing for floating-point registers.
 222  * Again, see the comments in m68k-tdep.c.
 223  */
 224
 225 void
 226 supply_fpregset (gdb_fpregset_t *fpregsetp)
 227 {
 228   long *regp = ALPHA_REGSET_BASE (fpregsetp);
 229
 230   /* FPCR is in slot 32.  */
 231   alpha_supply_fp_regs (-1, regp, regp + 31);
 232 }
 233
 234 void
 235 fill_fpregset (gdb_fpregset_t *fpregsetp, int regno)
 236 {
 237   long *regp = ALPHA_REGSET_BASE (fpregsetp);
 238
 239   /* FPCR is in slot 32.  */
 240   alpha_fill_fp_regs (regno, regp, regp + 31);
 241 }
 242 #endif
 243 \f
 244
 245 /* Register that we are able to handle alpha core file formats. */
 246
 247 static struct core_fns alpha_osf_core_fns =
 248 {
 249   /* This really is bfd_target_unknown_flavour.  */
 250
 251   bfd_target_unknown_flavour,           /* core_flavour */
 252   default_check_format,                 /* check_format */
 253   default_core_sniffer,                 /* core_sniffer */
 254   fetch_osf_core_registers,             /* core_read_registers */
 255   NULL                                  /* next */
 256 };
 257
 258 static struct core_fns alpha_elf_core_fns =
 259 {
 260   bfd_target_elf_flavour,               /* core_flavour */
 261   default_check_format,                 /* check_format */
 262   default_core_sniffer,                 /* core_sniffer */
 263   fetch_elf_core_registers,             /* core_read_registers */
 264   NULL                                  /* next */
 265 };
 266
 267 void
 268 _initialize_core_alpha (void)
 269 {
 270   deprecated_add_core_fns (&alpha_osf_core_fns);
 271   deprecated_add_core_fns (&alpha_elf_core_fns);
 272 }