gdb/sparc-nat.c

   1 /* Functions specific to running gdb native on a SPARC running SunOS4.
   2    Copyright 1989, 1992, 1993, 1994, 1996 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 #include "defs.h"
  21 #include "inferior.h"
  22 #include "target.h"
  23 #include "gdbcore.h"
  24
  25 #include <signal.h>
  26 #include <sys/ptrace.h>
  27 #include <sys/wait.h>
  28 #include <machine/reg.h>
  29 #include <sys/user.h>
  30
  31 /* We don't store all registers immediately when requested, since they
  32    get sent over in large chunks anyway.  Instead, we accumulate most
  33    of the changes and send them over once.  "deferred_stores" keeps
  34    track of which sets of registers we have locally-changed copies of,
  35    so we only need send the groups that have changed.  */
  36
  37 #define INT_REGS        1
  38 #define STACK_REGS      2
  39 #define FP_REGS         4
  40
  41 static void
  42 fetch_core_registers PARAMS ((char *, unsigned int, int, CORE_ADDR));
  43
  44 /* Fetch one or more registers from the inferior.  REGNO == -1 to get
  45    them all.  We actually fetch more than requested, when convenient,
  46    marking them as valid so we won't fetch them again.  */
  47
  48 void
  49 fetch_inferior_registers (regno)
  50      int regno;
  51 {
  52   struct regs inferior_registers;
  53   struct fp_status inferior_fp_registers;
  54   int i;
  55
  56   /* We should never be called with deferred stores, because a prerequisite
  57      for writing regs is to have fetched them all (PREPARE_TO_STORE), sigh.  */
  58   if (deferred_stores) abort();
  59
  60   DO_DEFERRED_STORES;
  61
  62   /* Global and Out regs are fetched directly, as well as the control
  63      registers.  If we're getting one of the in or local regs,
  64      and the stack pointer has not yet been fetched,
  65      we have to do that first, since they're found in memory relative
  66      to the stack pointer.  */
  67   if (regno < O7_REGNUM  /* including -1 */
  68       || regno >= Y_REGNUM
  69       || (!register_valid[SP_REGNUM] && regno < I7_REGNUM))
  70     {
  71       if (0 != ptrace (PTRACE_GETREGS, inferior_pid,
  72                        (PTRACE_ARG3_TYPE) &inferior_registers, 0))
  73         perror("ptrace_getregs");
  74
  75       registers[REGISTER_BYTE (0)] = 0;
  76       memcpy (&registers[REGISTER_BYTE (1)], &inferior_registers.r_g1,
  77               15 * REGISTER_RAW_SIZE (G0_REGNUM));
  78       *(int *)&registers[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
  79       *(int *)&registers[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
  80       *(int *)&registers[REGISTER_BYTE (NPC_REGNUM)] = inferior_registers.r_npc;
  81       *(int *)&registers[REGISTER_BYTE (Y_REGNUM)] = inferior_registers.r_y;
  82
  83       for (i = G0_REGNUM; i <= O7_REGNUM; i++)
  84         register_valid[i] = 1;
  85       register_valid[Y_REGNUM] = 1;
  86       register_valid[PS_REGNUM] = 1;
  87       register_valid[PC_REGNUM] = 1;
  88       register_valid[NPC_REGNUM] = 1;
  89       /* If we don't set these valid, read_register_bytes() rereads
  90          all the regs every time it is called!  FIXME.  */
  91       register_valid[WIM_REGNUM] = 1;   /* Not true yet, FIXME */
  92       register_valid[TBR_REGNUM] = 1;   /* Not true yet, FIXME */
  93       register_valid[CPS_REGNUM] = 1;   /* Not true yet, FIXME */
  94     }
  95
  96   /* Floating point registers */
  97   if (regno == -1 ||
  98       regno == FPS_REGNUM ||
  99       (regno >= FP0_REGNUM && regno <= FP0_REGNUM + 31))
 100     {
 101       if (0 != ptrace (PTRACE_GETFPREGS, inferior_pid,
 102                        (PTRACE_ARG3_TYPE) &inferior_fp_registers,
 103                        0))
 104             perror("ptrace_getfpregs");
 105       memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers,
 106               sizeof inferior_fp_registers.fpu_fr);
 107       memcpy (&registers[REGISTER_BYTE (FPS_REGNUM)],
 108              &inferior_fp_registers.Fpu_fsr,
 109              sizeof (FPU_FSR_TYPE));
 110       for (i = FP0_REGNUM; i <= FP0_REGNUM+31; i++)
 111         register_valid[i] = 1;
 112       register_valid[FPS_REGNUM] = 1;
 113     }
 114
 115   /* These regs are saved on the stack by the kernel.  Only read them
 116      all (16 ptrace calls!) if we really need them.  */
 117   if (regno == -1)
 118     {
 119       target_xfer_memory (*(CORE_ADDR*)&registers[REGISTER_BYTE (SP_REGNUM)],
 120                           &registers[REGISTER_BYTE (L0_REGNUM)],
 121                           16*REGISTER_RAW_SIZE (L0_REGNUM), 0);
 122       for (i = L0_REGNUM; i <= I7_REGNUM; i++)
 123         register_valid[i] = 1;
 124     }
 125   else if (regno >= L0_REGNUM && regno <= I7_REGNUM)
 126     {
 127       CORE_ADDR sp = *(CORE_ADDR*)&registers[REGISTER_BYTE (SP_REGNUM)];
 128       i = REGISTER_BYTE (regno);
 129       if (register_valid[regno])
 130         printf_unfiltered("register %d valid and read\n", regno);
 131       target_xfer_memory (sp + i - REGISTER_BYTE (L0_REGNUM),
 132                           &registers[i], REGISTER_RAW_SIZE (regno), 0);
 133       register_valid[regno] = 1;
 134     }
 135 }
 136
 137 /* Store our register values back into the inferior.
 138    If REGNO is -1, do this for all registers.
 139    Otherwise, REGNO specifies which register (so we can save time).  */
 140
 141 void
 142 store_inferior_registers (regno)
 143      int regno;
 144 {
 145   struct regs inferior_registers;
 146   struct fp_status inferior_fp_registers;
 147   int wanna_store = INT_REGS + STACK_REGS + FP_REGS;
 148
 149   /* First decide which pieces of machine-state we need to modify.
 150      Default for regno == -1 case is all pieces.  */
 151   if (regno >= 0)
 152     if (FP0_REGNUM <= regno && regno < FP0_REGNUM + 32)
 153       {
 154         wanna_store = FP_REGS;
 155       }
 156     else
 157       {
 158         if (regno == SP_REGNUM)
 159           wanna_store = INT_REGS + STACK_REGS;
 160         else if (regno < L0_REGNUM || regno > I7_REGNUM)
 161           wanna_store = INT_REGS;
 162         else if (regno == FPS_REGNUM)
 163           wanna_store = FP_REGS;
 164         else
 165           wanna_store = STACK_REGS;
 166       }
 167
 168   /* See if we're forcing the stores to happen now, or deferring. */
 169   if (regno == -2)
 170     {
 171       wanna_store = deferred_stores;
 172       deferred_stores = 0;
 173     }
 174   else
 175     {
 176       if (wanna_store == STACK_REGS)
 177         {
 178           /* Fall through and just store one stack reg.  If we deferred
 179              it, we'd have to store them all, or remember more info.  */
 180         }
 181       else
 182         {
 183           deferred_stores |= wanna_store;
 184           return;
 185         }
 186     }
 187
 188   if (wanna_store & STACK_REGS)
 189     {
 190       CORE_ADDR sp = *(CORE_ADDR *)&registers[REGISTER_BYTE (SP_REGNUM)];
 191
 192       if (regno < 0 || regno == SP_REGNUM)
 193         {
 194           if (!register_valid[L0_REGNUM+5]) abort();
 195           target_xfer_memory (sp,
 196                               &registers[REGISTER_BYTE (L0_REGNUM)],
 197                               16*REGISTER_RAW_SIZE (L0_REGNUM), 1);
 198         }
 199       else
 200         {
 201           if (!register_valid[regno]) abort();
 202           target_xfer_memory (sp + REGISTER_BYTE (regno) - REGISTER_BYTE (L0_REGNUM),
 203                               &registers[REGISTER_BYTE (regno)],
 204                               REGISTER_RAW_SIZE (regno), 1);
 205         }
 206
 207     }
 208
 209   if (wanna_store & INT_REGS)
 210     {
 211       if (!register_valid[G1_REGNUM]) abort();
 212
 213       memcpy (&inferior_registers.r_g1, &registers[REGISTER_BYTE (G1_REGNUM)],
 214               15 * REGISTER_RAW_SIZE (G1_REGNUM));
 215
 216       inferior_registers.r_ps =
 217         *(int *)&registers[REGISTER_BYTE (PS_REGNUM)];
 218       inferior_registers.r_pc =
 219         *(int *)&registers[REGISTER_BYTE (PC_REGNUM)];
 220       inferior_registers.r_npc =
 221         *(int *)&registers[REGISTER_BYTE (NPC_REGNUM)];
 222       inferior_registers.r_y =
 223         *(int *)&registers[REGISTER_BYTE (Y_REGNUM)];
 224
 225       if (0 != ptrace (PTRACE_SETREGS, inferior_pid,
 226                        (PTRACE_ARG3_TYPE) &inferior_registers, 0))
 227         perror("ptrace_setregs");
 228     }
 229
 230   if (wanna_store & FP_REGS)
 231     {
 232       if (!register_valid[FP0_REGNUM+9]) abort();
 233       memcpy (&inferior_fp_registers, &registers[REGISTER_BYTE (FP0_REGNUM)],
 234               sizeof inferior_fp_registers.fpu_fr);
 235       memcpy (&inferior_fp_registers.Fpu_fsr,
 236               &registers[REGISTER_BYTE (FPS_REGNUM)], sizeof (FPU_FSR_TYPE));
 237       if (0 !=
 238          ptrace (PTRACE_SETFPREGS, inferior_pid,
 239                  (PTRACE_ARG3_TYPE) &inferior_fp_registers, 0))
 240          perror("ptrace_setfpregs");
 241     }
 242 }
 243
 244
 245 static void
 246 fetch_core_registers (core_reg_sect, core_reg_size, which, ignore)
 247   char *core_reg_sect;
 248   unsigned core_reg_size;
 249   int which;
 250   CORE_ADDR ignore;     /* reg addr, unused in this version */
 251 {
 252
 253   if (which == 0) {
 254
 255     /* Integer registers */
 256
 257 #define gregs ((struct regs *)core_reg_sect)
 258     /* G0 *always* holds 0.  */
 259     *(int *)&registers[REGISTER_BYTE (0)] = 0;
 260
 261     /* The globals and output registers.  */
 262     memcpy (&registers[REGISTER_BYTE (G1_REGNUM)], &gregs->r_g1,
 263             15 * REGISTER_RAW_SIZE (G1_REGNUM));
 264     *(int *)&registers[REGISTER_BYTE (PS_REGNUM)] = gregs->r_ps;
 265     *(int *)&registers[REGISTER_BYTE (PC_REGNUM)] = gregs->r_pc;
 266     *(int *)&registers[REGISTER_BYTE (NPC_REGNUM)] = gregs->r_npc;
 267     *(int *)&registers[REGISTER_BYTE (Y_REGNUM)] = gregs->r_y;
 268
 269     /* My best guess at where to get the locals and input
 270        registers is exactly where they usually are, right above
 271        the stack pointer.  If the core dump was caused by a bus error
 272        from blowing away the stack pointer (as is possible) then this
 273        won't work, but it's worth the try. */
 274     {
 275       int sp;
 276
 277       sp = *(int *)&registers[REGISTER_BYTE (SP_REGNUM)];
 278       if (0 != target_read_memory (sp, &registers[REGISTER_BYTE (L0_REGNUM)],
 279                           16 * REGISTER_RAW_SIZE (L0_REGNUM)))
 280         {
 281           /* fprintf_unfiltered so user can still use gdb */
 282           fprintf_unfiltered (gdb_stderr,
 283                    "Couldn't read input and local registers from core file\n");
 284         }
 285     }
 286   } else if (which == 2) {
 287
 288     /* Floating point registers */
 289
 290 #define fpuregs  ((struct fpu *) core_reg_sect)
 291     if (core_reg_size >= sizeof (struct fpu))
 292       {
 293         memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], fpuregs->fpu_regs,
 294                 sizeof (fpuregs->fpu_regs));
 295         memcpy (&registers[REGISTER_BYTE (FPS_REGNUM)], &fpuregs->fpu_fsr,
 296                 sizeof (FPU_FSR_TYPE));
 297       }
 298     else
 299       fprintf_unfiltered (gdb_stderr, "Couldn't read float regs from core file\n");
 300   }
 301 }
 302
 303 int
 304 kernel_u_size ()
 305 {
 306   return (sizeof (struct user));
 307 }
 308
 309 \f
 310 /* Register that we are able to handle sparc core file formats.
 311    FIXME: is this really bfd_target_unknown_flavour? */
 312
 313 static struct core_fns sparc_core_fns =
 314 {
 315   bfd_target_unknown_flavour,
 316   fetch_core_registers,
 317   NULL
 318 };
 319
 320 void
 321 _initialize_core_sparc ()
 322 {
 323   add_core_fns (&sparc_core_fns);
 324 }