gdb/sparc-xdep.c

   1 /* Host-dependent code for SPARC host systems, for GDB, the GNU debugger.
   2    Copyright 1986, 1987, 1989, 1990, 1991  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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #include <stdio.h>
  21 #include "defs.h"
  22 #include "inferior.h"
  23 #include "target.h"
  24
  25 #include <sys/param.h>
  26 #include <sys/file.h>           /* For L_SET */
  27
  28 #include <sys/ptrace.h>
  29 #include <machine/reg.h>
  30
  31 #include "gdbcore.h"
  32 #include <sys/core.h>
  33
  34 extern char register_valid[];
  35
  36 /* We don't store all registers immediately when requested, since they
  37    get sent over in large chunks anyway.  Instead, we accumulate most
  38    of the changes and send them over once.  "deferred_stores" keeps
  39    track of which sets of registers we have locally-changed copies of,
  40    so we only need send the groups that have changed.  */
  41
  42 #define INT_REGS        1
  43 #define STACK_REGS      2
  44 #define FP_REGS         4
  45
  46 int deferred_stores = 0;        /* Cumulates stores we want to do eventually. */
  47
  48 /* Fetch one or more registers from the inferior.  REGNO == -1 to get
  49    them all.  We actually fetch more than requested, when convenient,
  50    marking them as valid so we won't fetch them again.  */
  51 void
  52 fetch_inferior_registers (regno)
  53      int regno;
  54 {
  55   struct regs inferior_registers;
  56   struct fp_status inferior_fp_registers;
  57   int i;
  58
  59   /* We should never be called with deferred stores, because a prerequisite
  60      for writing regs is to have fetched them all (PREPARE_TO_STORE), sigh.  */
  61   if (deferred_stores) abort();
  62
  63   DO_DEFERRED_STORES;
  64
  65   /* Global and Out regs are fetched directly, as well as the control
  66      registers.  If we're getting one of the in or local regs,
  67      and the stack pointer has not yet been fetched,
  68      we have to do that first, since they're found in memory relative
  69      to the stack pointer.  */
  70   if (regno < O7_REGNUM  /* including -1 */
  71       || regno >= Y_REGNUM
  72       || (!register_valid[SP_REGNUM] && regno < I7_REGNUM))
  73     {
  74       if (0 != ptrace (PTRACE_GETREGS, inferior_pid, &inferior_registers))
  75             perror("ptrace_getregs");
  76
  77       registers[REGISTER_BYTE (0)] = 0;
  78       bcopy (&inferior_registers.r_g1, &registers[REGISTER_BYTE (1)], 15 * REGISTER_RAW_SIZE (G0_REGNUM));
  79       *(int *)&registers[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
  80       *(int *)&registers[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
  81       *(int *)&registers[REGISTER_BYTE (NPC_REGNUM)] = inferior_registers.r_npc;
  82       *(int *)&registers[REGISTER_BYTE (Y_REGNUM)] = inferior_registers.r_y;
  83
  84       for (i = G0_REGNUM; i <= O7_REGNUM; i++)
  85         register_valid[i] = 1;
  86       register_valid[Y_REGNUM] = 1;
  87       register_valid[PS_REGNUM] = 1;
  88       register_valid[PC_REGNUM] = 1;
  89       register_valid[NPC_REGNUM] = 1;
  90       /* If we don't set these valid, read_register_bytes() rereads
  91          all the regs every time it is called!  FIXME.  */
  92       register_valid[WIM_REGNUM] = 1;   /* Not true yet, FIXME */
  93       register_valid[TBR_REGNUM] = 1;   /* Not true yet, FIXME */
  94       register_valid[FPS_REGNUM] = 1;   /* Not true yet, FIXME */
  95       register_valid[CPS_REGNUM] = 1;   /* Not true yet, FIXME */
  96     }
  97
  98   /* Floating point registers */
  99   if (regno == -1 || (regno >= FP0_REGNUM && regno <= FP0_REGNUM + 31))
 100     {
 101       if (0 != ptrace (PTRACE_GETFPREGS, inferior_pid, &inferior_fp_registers))
 102             perror("ptrace_getfpregs");
 103       bcopy (&inferior_fp_registers, &registers[REGISTER_BYTE (FP0_REGNUM)],
 104              sizeof inferior_fp_registers.fpu_fr);
 105       /* bcopy (&inferior_fp_registers.Fpu_fsr,
 106              &registers[REGISTER_BYTE (FPS_REGNUM)],
 107              sizeof (FPU_FSR_TYPE));  FIXME???  -- gnu@cyg */
 108       for (i = FP0_REGNUM; i <= FP0_REGNUM+31; i++)
 109         register_valid[i] = 1;
 110       register_valid[FPS_REGNUM] = 1;
 111     }
 112
 113   /* These regs are saved on the stack by the kernel.  Only read them
 114      all (16 ptrace calls!) if we really need them.  */
 115   if (regno == -1)
 116     {
 117       target_xfer_memory (*(CORE_ADDR*)&registers[REGISTER_BYTE (SP_REGNUM)],
 118                           &registers[REGISTER_BYTE (L0_REGNUM)],
 119                           16*REGISTER_RAW_SIZE (L0_REGNUM), 0);
 120       for (i = L0_REGNUM; i <= I7_REGNUM; i++)
 121         register_valid[i] = 1;
 122     }
 123   else if (regno >= L0_REGNUM && regno <= I7_REGNUM)
 124     {
 125       CORE_ADDR sp = *(CORE_ADDR*)&registers[REGISTER_BYTE (SP_REGNUM)];
 126       i = REGISTER_BYTE (regno);
 127       if (register_valid[regno])
 128         printf("register %d valid and read\n", regno);
 129       target_xfer_memory (sp + i - REGISTER_BYTE (L0_REGNUM),
 130                           &registers[i], REGISTER_RAW_SIZE (regno), 0);
 131       register_valid[regno] = 1;
 132     }
 133 }
 134
 135 /* Store our register values back into the inferior.
 136    If REGNO is -1, do this for all registers.
 137    Otherwise, REGNO specifies which register (so we can save time).  */
 138
 139 int
 140 store_inferior_registers (regno)
 141      int regno;
 142 {
 143   struct regs inferior_registers;
 144   struct fp_status inferior_fp_registers;
 145   int wanna_store = INT_REGS + STACK_REGS + FP_REGS;
 146
 147   /* First decide which pieces of machine-state we need to modify.
 148      Default for regno == -1 case is all pieces.  */
 149   if (regno >= 0)
 150     if (FP0_REGNUM <= regno && regno < FP0_REGNUM + 32)
 151       {
 152         wanna_store = FP_REGS;
 153       }
 154     else
 155       {
 156         if (regno == SP_REGNUM)
 157           wanna_store = INT_REGS + STACK_REGS;
 158         else if (regno < L0_REGNUM || regno > I7_REGNUM)
 159           wanna_store = INT_REGS;
 160         else
 161           wanna_store = STACK_REGS;
 162       }
 163
 164   /* See if we're forcing the stores to happen now, or deferring. */
 165   if (regno == -2)
 166     {
 167       wanna_store = deferred_stores;
 168       deferred_stores = 0;
 169     }
 170   else
 171     {
 172       if (wanna_store == STACK_REGS)
 173         {
 174           /* Fall through and just store one stack reg.  If we deferred
 175              it, we'd have to store them all, or remember more info.  */
 176         }
 177       else
 178         {
 179           deferred_stores |= wanna_store;
 180           return 0;
 181         }
 182     }
 183
 184   if (wanna_store & STACK_REGS)
 185     {
 186       CORE_ADDR sp = *(CORE_ADDR *)&registers[REGISTER_BYTE (SP_REGNUM)];
 187
 188       if (regno < 0 || regno == SP_REGNUM)
 189         {
 190           if (!register_valid[L0_REGNUM+5]) abort();
 191           target_xfer_memory (sp,
 192                               &registers[REGISTER_BYTE (L0_REGNUM)],
 193                               16*REGISTER_RAW_SIZE (L0_REGNUM), 1);
 194         }
 195       else
 196         {
 197           if (!register_valid[regno]) abort();
 198           target_xfer_memory (sp + REGISTER_BYTE (regno) - REGISTER_BYTE (L0_REGNUM),
 199                               &registers[REGISTER_BYTE (regno)],
 200                               REGISTER_RAW_SIZE (regno), 1);
 201         }
 202
 203     }
 204
 205   if (wanna_store & INT_REGS)
 206     {
 207       if (!register_valid[G1_REGNUM]) abort();
 208
 209       bcopy (&registers[REGISTER_BYTE (G1_REGNUM)],
 210              &inferior_registers.r_g1, 15 * REGISTER_RAW_SIZE (G1_REGNUM));
 211
 212       inferior_registers.r_ps =
 213         *(int *)&registers[REGISTER_BYTE (PS_REGNUM)];
 214       inferior_registers.r_pc =
 215         *(int *)&registers[REGISTER_BYTE (PC_REGNUM)];
 216       inferior_registers.r_npc =
 217         *(int *)&registers[REGISTER_BYTE (NPC_REGNUM)];
 218       inferior_registers.r_y =
 219         *(int *)&registers[REGISTER_BYTE (Y_REGNUM)];
 220
 221       if (0 != ptrace (PTRACE_SETREGS, inferior_pid, &inferior_registers))
 222         perror("ptrace_setregs");
 223     }
 224
 225   if (wanna_store & FP_REGS)
 226     {
 227       if (!register_valid[FP0_REGNUM+9]) abort();
 228       bcopy (&registers[REGISTER_BYTE (FP0_REGNUM)],
 229              &inferior_fp_registers,
 230              sizeof inferior_fp_registers.fpu_fr);
 231
 232 /*      bcopy (&registers[REGISTER_BYTE (FPS_REGNUM)],
 233              &inferior_fp_registers.Fpu_fsr,
 234              sizeof (FPU_FSR_TYPE));
 235 ****/
 236       if (0 !=
 237          ptrace (PTRACE_SETFPREGS, inferior_pid, &inferior_fp_registers))
 238          perror("ptrace_setfpregs");
 239     }
 240     return 0;
 241 }
 242 \f
 243 void
 244 fetch_core_registers (core_reg_sect, core_reg_size, which)
 245   char *core_reg_sect;
 246   unsigned core_reg_size;
 247   int which;
 248 {
 249
 250   if (which == 0) {
 251
 252     /* Integer registers */
 253
 254 #define gregs ((struct regs *)core_reg_sect)
 255     /* G0 *always* holds 0.  */
 256     *(int *)&registers[REGISTER_BYTE (0)] = 0;
 257
 258     /* The globals and output registers.  */
 259     bcopy (&gregs->r_g1,
 260            &registers[REGISTER_BYTE (G1_REGNUM)],
 261            15 * REGISTER_RAW_SIZE (G1_REGNUM));
 262     *(int *)&registers[REGISTER_BYTE (PS_REGNUM)] = gregs->r_ps;
 263     *(int *)&registers[REGISTER_BYTE (PC_REGNUM)] = gregs->r_pc;
 264     *(int *)&registers[REGISTER_BYTE (NPC_REGNUM)] = gregs->r_npc;
 265     *(int *)&registers[REGISTER_BYTE (Y_REGNUM)] = gregs->r_y;
 266
 267     /* My best guess at where to get the locals and input
 268        registers is exactly where they usually are, right above
 269        the stack pointer.  If the core dump was caused by a bus error
 270        from blowing away the stack pointer (as is possible) then this
 271        won't work, but it's worth the try. */
 272     {
 273       int sp;
 274
 275       sp = *(int *)&registers[REGISTER_BYTE (SP_REGNUM)];
 276       if (0 != target_read_memory (sp, &registers[REGISTER_BYTE (L0_REGNUM)],
 277                           16 * REGISTER_RAW_SIZE (L0_REGNUM)))
 278         {
 279           /* fprintf so user can still use gdb */
 280           fprintf (stderr,
 281                    "Couldn't read input and local registers from core file\n");
 282         }
 283     }
 284   } else if (which == 2) {
 285
 286     /* Floating point registers */
 287
 288 #define fpuregs  ((struct fpu *) core_reg_sect)
 289     if (core_reg_size >= sizeof (struct fpu))
 290       {
 291         bcopy (fpuregs->fpu_regs,
 292                &registers[REGISTER_BYTE (FP0_REGNUM)],
 293                sizeof (fpuregs->fpu_regs));
 294         bcopy (&fpuregs->fpu_fsr,
 295                &registers[REGISTER_BYTE (FPS_REGNUM)],
 296                sizeof (FPU_FSR_TYPE));
 297       }
 298     else
 299       fprintf (stderr, "Couldn't read float regs from core file\n");
 300   }
 301 }