gdb/alpha-nat.c

   1 /* Low level Alpha interface, for GDB when running native.
   2    Copyright 1993, 1995, 1996, 1998, 1999, 2000, 2001
   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., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, 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   register int regno;
  63   register 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 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
  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
  95 #endif
  96   };
  97   static char zerobuf[ALPHA_MAX_REGISTER_RAW_SIZE] =
  98   {0};
  99
 100   for (regno = 0; regno < NUM_REGS; regno++)
 101     {
 102       if (CANNOT_FETCH_REGISTER (regno))
 103         {
 104           supply_register (regno, zerobuf);
 105           continue;
 106         }
 107       addr = 8 * core_reg_mapping[regno];
 108       if (addr < 0 || addr >= core_reg_size)
 109         {
 110           if (bad_reg < 0)
 111             bad_reg = regno;
 112         }
 113       else
 114         {
 115           supply_register (regno, core_reg_sect + addr);
 116         }
 117     }
 118   if (bad_reg >= 0)
 119     {
 120       error ("Register %s not found in core file.", REGISTER_NAME (bad_reg));
 121     }
 122 }
 123
 124 static void
 125 fetch_elf_core_registers (char *core_reg_sect, unsigned core_reg_size,
 126                           int which, CORE_ADDR reg_addr)
 127 {
 128   if (core_reg_size < 32 * 8)
 129     {
 130       error ("Core file register section too small (%u bytes).", core_reg_size);
 131       return;
 132     }
 133
 134   if (which == 2)
 135     {
 136       /* The FPU Registers.  */
 137       memcpy (&deprecated_registers[REGISTER_BYTE (FP0_REGNUM)],
 138               core_reg_sect, 31 * 8);
 139       memset (&deprecated_registers[REGISTER_BYTE (FP0_REGNUM + 31)], 0, 8);
 140       memset (&deprecated_register_valid[FP0_REGNUM], 1, 32);
 141     }
 142   else
 143     {
 144       /* The General Registers.  */
 145       memcpy (&deprecated_registers[REGISTER_BYTE (ALPHA_V0_REGNUM)],
 146               core_reg_sect, 31 * 8);
 147       memcpy (&deprecated_registers[REGISTER_BYTE (PC_REGNUM)],
 148               core_reg_sect + 31 * 8, 8);
 149       memset (&deprecated_registers[REGISTER_BYTE (ALPHA_ZERO_REGNUM)], 0, 8);
 150       memset (&deprecated_register_valid[ALPHA_V0_REGNUM], 1, 32);
 151       deprecated_register_valid[PC_REGNUM] = 1;
 152     }
 153 }
 154
 155
 156 /* Map gdb internal register number to a ptrace ``address''.
 157    These ``addresses'' are defined in <sys/ptrace.h> */
 158
 159 #define REGISTER_PTRACE_ADDR(regno) \
 160    (regno < FP0_REGNUM ?        GPR_BASE + (regno) \
 161   : regno == PC_REGNUM ?        PC      \
 162   : regno >= FP0_REGNUM ?       FPR_BASE + ((regno) - FP0_REGNUM) \
 163   : 0)
 164
 165 /* Return the ptrace ``address'' of register REGNO. */
 166
 167 CORE_ADDR
 168 register_addr (int regno, CORE_ADDR blockend)
 169 {
 170   return REGISTER_PTRACE_ADDR (regno);
 171 }
 172
 173 int
 174 kernel_u_size (void)
 175 {
 176   return (sizeof (struct user));
 177 }
 178
 179 #if defined(USE_PROC_FS) || defined(HAVE_GREGSET_T)
 180 #include <sys/procfs.h>
 181
 182 /* Prototypes for supply_gregset etc. */
 183 #include "gregset.h"
 184
 185 /*
 186  * See the comment in m68k-tdep.c regarding the utility of these functions.
 187  */
 188
 189 void
 190 supply_gregset (gdb_gregset_t *gregsetp)
 191 {
 192   register int regi;
 193   register long *regp = ALPHA_REGSET_BASE (gregsetp);
 194   static char zerobuf[ALPHA_MAX_REGISTER_RAW_SIZE] =
 195   {0};
 196
 197   for (regi = 0; regi < 31; regi++)
 198     supply_register (regi, (char *) (regp + regi));
 199
 200   supply_register (PC_REGNUM, (char *) (regp + 31));
 201
 202   /* Fill inaccessible registers with zero.  */
 203   supply_register (ALPHA_ZERO_REGNUM, zerobuf);
 204   supply_register (FP_REGNUM, zerobuf);
 205 }
 206
 207 void
 208 fill_gregset (gdb_gregset_t *gregsetp, int regno)
 209 {
 210   int regi;
 211   register long *regp = ALPHA_REGSET_BASE (gregsetp);
 212
 213   for (regi = 0; regi < 31; regi++)
 214     if ((regno == -1) || (regno == regi))
 215       *(regp + regi) = *(long *) &deprecated_registers[REGISTER_BYTE (regi)];
 216
 217   if ((regno == -1) || (regno == PC_REGNUM))
 218     *(regp + 31) = *(long *) &deprecated_registers[REGISTER_BYTE (PC_REGNUM)];
 219 }
 220
 221 /*
 222  * Now we do the same thing for floating-point registers.
 223  * Again, see the comments in m68k-tdep.c.
 224  */
 225
 226 void
 227 supply_fpregset (gdb_fpregset_t *fpregsetp)
 228 {
 229   register int regi;
 230   register long *regp = ALPHA_REGSET_BASE (fpregsetp);
 231
 232   for (regi = 0; regi < 32; regi++)
 233     supply_register (regi + FP0_REGNUM, (char *) (regp + regi));
 234 }
 235
 236 void
 237 fill_fpregset (gdb_fpregset_t *fpregsetp, int regno)
 238 {
 239   int regi;
 240   register long *regp = ALPHA_REGSET_BASE (fpregsetp);
 241
 242   for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
 243     {
 244       if ((regno == -1) || (regno == regi))
 245         {
 246           *(regp + regi - FP0_REGNUM) =
 247             *(long *) &deprecated_registers[REGISTER_BYTE (regi)];
 248         }
 249     }
 250 }
 251 #endif
 252 \f
 253
 254 /* Register that we are able to handle alpha core file formats. */
 255
 256 static struct core_fns alpha_osf_core_fns =
 257 {
 258   /* This really is bfd_target_unknown_flavour.  */
 259
 260   bfd_target_unknown_flavour,           /* core_flavour */
 261   default_check_format,                 /* check_format */
 262   default_core_sniffer,                 /* core_sniffer */
 263   fetch_osf_core_registers,             /* core_read_registers */
 264   NULL                                  /* next */
 265 };
 266
 267 static struct core_fns alpha_elf_core_fns =
 268 {
 269   bfd_target_elf_flavour,               /* core_flavour */
 270   default_check_format,                 /* check_format */
 271   default_core_sniffer,                 /* core_sniffer */
 272   fetch_elf_core_registers,             /* core_read_registers */
 273   NULL                                  /* next */
 274 };
 275
 276 void
 277 _initialize_core_alpha (void)
 278 {
 279   add_core_fns (&alpha_osf_core_fns);
 280   add_core_fns (&alpha_elf_core_fns);
 281 }