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 "inferior.h"
  24 #include "gdbcore.h"
  25 #include "target.h"
  26 #include "regcache.h"
  27
  28 #include "alpha-tdep.h"
  29
  30 #include <sys/ptrace.h>
  31 #ifdef __linux__
  32 #include <asm/reg.h>
  33 #include <alpha/ptrace.h>
  34 #else
  35 #include <alpha/coreregs.h>
  36 #endif
  37 #include <sys/user.h>
  38
  39 /* Prototypes for local functions. */
  40
  41 static void fetch_osf_core_registers (char *, unsigned, int, CORE_ADDR);
  42 static void fetch_elf_core_registers (char *, unsigned, int, CORE_ADDR);
  43
  44 /* Extract the register values out of the core file and store
  45    them where `read_register' will find them.
  46
  47    CORE_REG_SECT points to the register values themselves, read into memory.
  48    CORE_REG_SIZE is the size of that area.
  49    WHICH says which set of registers we are handling (0 = int, 2 = float
  50    on machines where they are discontiguous).
  51    REG_ADDR is the offset from u.u_ar0 to the register values relative to
  52    core_reg_sect.  This is used with old-fashioned core files to
  53    locate the registers in a large upage-plus-stack ".reg" section.
  54    Original upage address X is at location core_reg_sect+x+reg_addr.
  55  */
  56
  57 static void
  58 fetch_osf_core_registers (char *core_reg_sect, unsigned core_reg_size,
  59                           int which, CORE_ADDR reg_addr)
  60 {
  61   register int regno;
  62   register int addr;
  63   int bad_reg = -1;
  64
  65   /* Table to map a gdb regnum to an index in the core register
  66      section.  The floating point register values are garbage in
  67      OSF/1.2 core files.  OSF5 uses different names for the register
  68      enum list, need to handle two cases.  The actual values are the
  69      same.  */
  70   static int core_reg_mapping[ALPHA_NUM_REGS] =
  71   {
  72 #ifdef NCF_REGS
  73 #define EFL NCF_REGS
  74     CF_V0, CF_T0, CF_T1, CF_T2, CF_T3, CF_T4, CF_T5, CF_T6,
  75     CF_T7, CF_S0, CF_S1, CF_S2, CF_S3, CF_S4, CF_S5, CF_S6,
  76     CF_A0, CF_A1, CF_A2, CF_A3, CF_A4, CF_A5, CF_T8, CF_T9,
  77     CF_T10, CF_T11, CF_RA, CF_T12, CF_AT, CF_GP, CF_SP, -1,
  78     EFL + 0, EFL + 1, EFL + 2, EFL + 3, EFL + 4, EFL + 5, EFL + 6, EFL + 7,
  79     EFL + 8, EFL + 9, EFL + 10, EFL + 11, EFL + 12, EFL + 13, EFL + 14, EFL + 15,
  80     EFL + 16, EFL + 17, EFL + 18, EFL + 19, EFL + 20, EFL + 21, EFL + 22, EFL + 23,
  81     EFL + 24, EFL + 25, EFL + 26, EFL + 27, EFL + 28, EFL + 29, EFL + 30, EFL + 31,
  82     CF_PC, -1
  83 #else
  84 #define EFL (EF_SIZE / 8)
  85     EF_V0, EF_T0, EF_T1, EF_T2, EF_T3, EF_T4, EF_T5, EF_T6,
  86     EF_T7, EF_S0, EF_S1, EF_S2, EF_S3, EF_S4, EF_S5, EF_S6,
  87     EF_A0, EF_A1, EF_A2, EF_A3, EF_A4, EF_A5, EF_T8, EF_T9,
  88     EF_T10, EF_T11, EF_RA, EF_T12, EF_AT, EF_GP, EF_SP, -1,
  89     EFL + 0, EFL + 1, EFL + 2, EFL + 3, EFL + 4, EFL + 5, EFL + 6, EFL + 7,
  90     EFL + 8, EFL + 9, EFL + 10, EFL + 11, EFL + 12, EFL + 13, EFL + 14, EFL + 15,
  91     EFL + 16, EFL + 17, EFL + 18, EFL + 19, EFL + 20, EFL + 21, EFL + 22, EFL + 23,
  92     EFL + 24, EFL + 25, EFL + 26, EFL + 27, EFL + 28, EFL + 29, EFL + 30, EFL + 31,
  93     EF_PC, -1
  94 #endif
  95   };
  96   static char zerobuf[ALPHA_MAX_REGISTER_RAW_SIZE] =
  97   {0};
  98
  99   for (regno = 0; regno < NUM_REGS; regno++)
 100     {
 101       if (CANNOT_FETCH_REGISTER (regno))
 102         {
 103           supply_register (regno, zerobuf);
 104           continue;
 105         }
 106       addr = 8 * core_reg_mapping[regno];
 107       if (addr < 0 || addr >= core_reg_size)
 108         {
 109           if (bad_reg < 0)
 110             bad_reg = regno;
 111         }
 112       else
 113         {
 114           supply_register (regno, core_reg_sect + addr);
 115         }
 116     }
 117   if (bad_reg >= 0)
 118     {
 119       error ("Register %s not found in core file.", REGISTER_NAME (bad_reg));
 120     }
 121 }
 122
 123 static void
 124 fetch_elf_core_registers (char *core_reg_sect, unsigned core_reg_size,
 125                           int which, CORE_ADDR reg_addr)
 126 {
 127   if (core_reg_size < 32 * 8)
 128     {
 129       error ("Core file register section too small (%u bytes).", core_reg_size);
 130       return;
 131     }
 132
 133   if (which == 2)
 134     {
 135       /* The FPU Registers.  */
 136       memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], core_reg_sect, 31 * 8);
 137       memset (&registers[REGISTER_BYTE (FP0_REGNUM + 31)], 0, 8);
 138       memset (&register_valid[FP0_REGNUM], 1, 32);
 139     }
 140   else
 141     {
 142       /* The General Registers.  */
 143       memcpy (&registers[REGISTER_BYTE (ALPHA_V0_REGNUM)], core_reg_sect,
 144               31 * 8);
 145       memcpy (&registers[REGISTER_BYTE (PC_REGNUM)], core_reg_sect + 31 * 8, 8);
 146       memset (&registers[REGISTER_BYTE (ALPHA_ZERO_REGNUM)], 0, 8);
 147       memset (&register_valid[ALPHA_V0_REGNUM], 1, 32);
 148       register_valid[PC_REGNUM] = 1;
 149     }
 150 }
 151
 152
 153 /* Map gdb internal register number to a ptrace ``address''.
 154    These ``addresses'' are defined in <sys/ptrace.h> */
 155
 156 #define REGISTER_PTRACE_ADDR(regno) \
 157    (regno < FP0_REGNUM ?        GPR_BASE + (regno) \
 158   : regno == PC_REGNUM ?        PC      \
 159   : regno >= FP0_REGNUM ?       FPR_BASE + ((regno) - FP0_REGNUM) \
 160   : 0)
 161
 162 /* Return the ptrace ``address'' of register REGNO. */
 163
 164 CORE_ADDR
 165 register_addr (int regno, CORE_ADDR blockend)
 166 {
 167   return REGISTER_PTRACE_ADDR (regno);
 168 }
 169
 170 int
 171 kernel_u_size (void)
 172 {
 173   return (sizeof (struct user));
 174 }
 175
 176 #if defined(USE_PROC_FS) || defined(HAVE_GREGSET_T)
 177 #include <sys/procfs.h>
 178
 179 /* Prototypes for supply_gregset etc. */
 180 #include "gregset.h"
 181
 182 /*
 183  * See the comment in m68k-tdep.c regarding the utility of these functions.
 184  */
 185
 186 void
 187 supply_gregset (gdb_gregset_t *gregsetp)
 188 {
 189   register int regi;
 190   register long *regp = ALPHA_REGSET_BASE (gregsetp);
 191   static char zerobuf[ALPHA_MAX_REGISTER_RAW_SIZE] =
 192   {0};
 193
 194   for (regi = 0; regi < 31; regi++)
 195     supply_register (regi, (char *) (regp + regi));
 196
 197   supply_register (PC_REGNUM, (char *) (regp + 31));
 198
 199   /* Fill inaccessible registers with zero.  */
 200   supply_register (ALPHA_ZERO_REGNUM, zerobuf);
 201   supply_register (FP_REGNUM, zerobuf);
 202 }
 203
 204 void
 205 fill_gregset (gdb_gregset_t *gregsetp, int regno)
 206 {
 207   int regi;
 208   register long *regp = ALPHA_REGSET_BASE (gregsetp);
 209
 210   for (regi = 0; regi < 31; regi++)
 211     if ((regno == -1) || (regno == regi))
 212       *(regp + regi) = *(long *) &registers[REGISTER_BYTE (regi)];
 213
 214   if ((regno == -1) || (regno == PC_REGNUM))
 215     *(regp + 31) = *(long *) &registers[REGISTER_BYTE (PC_REGNUM)];
 216 }
 217
 218 /*
 219  * Now we do the same thing for floating-point registers.
 220  * Again, see the comments in m68k-tdep.c.
 221  */
 222
 223 void
 224 supply_fpregset (gdb_fpregset_t *fpregsetp)
 225 {
 226   register int regi;
 227   register long *regp = ALPHA_REGSET_BASE (fpregsetp);
 228
 229   for (regi = 0; regi < 32; regi++)
 230     supply_register (regi + FP0_REGNUM, (char *) (regp + regi));
 231 }
 232
 233 void
 234 fill_fpregset (gdb_fpregset_t *fpregsetp, int regno)
 235 {
 236   int regi;
 237   register long *regp = ALPHA_REGSET_BASE (fpregsetp);
 238
 239   for (regi = FP0_REGNUM; regi < FP0_REGNUM + 32; regi++)
 240     {
 241       if ((regno == -1) || (regno == regi))
 242         {
 243           *(regp + regi - FP0_REGNUM) =
 244             *(long *) &registers[REGISTER_BYTE (regi)];
 245         }
 246     }
 247 }
 248 #endif
 249 \f
 250
 251 /* Register that we are able to handle alpha core file formats. */
 252
 253 static struct core_fns alpha_osf_core_fns =
 254 {
 255   /* This really is bfd_target_unknown_flavour.  */
 256
 257   bfd_target_unknown_flavour,           /* core_flavour */
 258   default_check_format,                 /* check_format */
 259   default_core_sniffer,                 /* core_sniffer */
 260   fetch_osf_core_registers,             /* core_read_registers */
 261   NULL                                  /* next */
 262 };
 263
 264 static struct core_fns alpha_elf_core_fns =
 265 {
 266   bfd_target_elf_flavour,               /* core_flavour */
 267   default_check_format,                 /* check_format */
 268   default_core_sniffer,                 /* core_sniffer */
 269   fetch_elf_core_registers,             /* core_read_registers */
 270   NULL                                  /* next */
 271 };
 272
 273 void
 274 _initialize_core_alpha (void)
 275 {
 276   add_core_fns (&alpha_osf_core_fns);
 277   add_core_fns (&alpha_elf_core_fns);
 278 }