gdb/sparc-xdep.c

   1 /* Machine-dependent code which would otherwise be in inflow.c and core.c,
   2    for GDB, the GNU debugger, for SPARC host systems.
   3
   4    Copyright (C) 1986, 1987, 1989, 1990  Free Software Foundation, Inc.
   5
   6 This file is part of GDB.
   7
   8 This program is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2 of the License, or
  11 (at your option) any later version.
  12
  13 This program is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this program; if not, write to the Free Software
  20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  21
  22 #include <stdio.h>
  23 #include "defs.h"
  24 #include "tm-sparc.h"
  25 #include "param-no-tm.h"
  26 #include "inferior.h"
  27 #include "target.h"
  28
  29 #include <sys/param.h>
  30 #include <sys/file.h>           /* For L_SET */
  31
  32 #include <sys/ptrace.h>
  33 #include <machine/reg.h>
  34
  35 #include "gdbcore.h"
  36 #include <sys/core.h>
  37
  38 extern char register_valid[];
  39
  40 /* We don't store all registers immediately when requested, since they
  41    get sent over in large chunks anyway.  Instead, we accumulate most
  42    of the changes and send them over once.  "deferred_stores" keeps
  43    track of which sets of registers we have locally-changed copies of,
  44    so we only need send the groups that have changed.  */
  45
  46 #define INT_REGS        1
  47 #define STACK_REGS      2
  48 #define FP_REGS         4
  49
  50 int deferred_stores = 0;        /* Cumulates stores we want to do eventually. */
  51
  52 /* Fetch one or more registers from the inferior.  REGNO == -1 to get
  53    them all.  We actually fetch more than requested, when convenient,
  54    marking them as valid so we won't fetch them again.  */
  55 void
  56 fetch_inferior_registers (regno)
  57      int regno;
  58 {
  59   struct regs inferior_registers;
  60   struct fp_status inferior_fp_registers;
  61   int i;
  62
  63   /* We should never be called with deferred stores, because a prerequisite
  64      for writing regs is to have fetched them all (PREPARE_TO_STORE), sigh.  */
  65   if (deferred_stores) abort();
  66
  67   DO_DEFERRED_STORES;
  68
  69   /* Global and Out regs are fetched directly, as well as the control
  70      registers.  If we're getting one of the in or local regs,
  71      and the stack pointer has not yet been fetched,
  72      we have to do that first, since they're found in memory relative
  73      to the stack pointer.  */
  74   if (regno < O7_REGNUM  /* including -1 */
  75       || regno >= Y_REGNUM
  76       || (!register_valid[SP_REGNUM] && regno < I7_REGNUM))
  77     {
  78       if (0 != ptrace (PTRACE_GETREGS, inferior_pid, &inferior_registers))
  79             perror("ptrace_getregs");
  80
  81       registers[REGISTER_BYTE (0)] = 0;
  82       bcopy (&inferior_registers.r_g1, &registers[REGISTER_BYTE (1)], 15 * REGISTER_RAW_SIZE (G0_REGNUM));
  83       *(int *)&registers[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
  84       *(int *)&registers[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
  85       *(int *)&registers[REGISTER_BYTE (NPC_REGNUM)] = inferior_registers.r_npc;
  86       *(int *)&registers[REGISTER_BYTE (Y_REGNUM)] = inferior_registers.r_y;
  87
  88       for (i = G0_REGNUM; i <= O7_REGNUM; i++)
  89         register_valid[i] = 1;
  90       register_valid[Y_REGNUM] = 1;
  91       register_valid[PS_REGNUM] = 1;
  92       register_valid[PC_REGNUM] = 1;
  93       register_valid[NPC_REGNUM] = 1;
  94       /* If we don't set these valid, read_register_bytes() rereads
  95          all the regs every time it is called!  FIXME.  */
  96       register_valid[WIM_REGNUM] = 1;   /* Not true yet, FIXME */
  97       register_valid[TBR_REGNUM] = 1;   /* Not true yet, FIXME */
  98       register_valid[FPS_REGNUM] = 1;   /* Not true yet, FIXME */
  99       register_valid[CPS_REGNUM] = 1;   /* Not true yet, FIXME */
 100     }
 101
 102   /* Floating point registers */
 103   if (regno == -1 || (regno >= FP0_REGNUM && regno <= FP0_REGNUM + 31))
 104     {
 105       if (0 != ptrace (PTRACE_GETFPREGS, inferior_pid, &inferior_fp_registers))
 106             perror("ptrace_getfpregs");
 107       bcopy (&inferior_fp_registers, &registers[REGISTER_BYTE (FP0_REGNUM)],
 108              sizeof inferior_fp_registers.fpu_fr);
 109       /* bcopy (&inferior_fp_registers.Fpu_fsr,
 110              &registers[REGISTER_BYTE (FPS_REGNUM)],
 111              sizeof (FPU_FSR_TYPE));  FIXME???  -- gnu@cyg */
 112       for (i = FP0_REGNUM; i <= FP0_REGNUM+31; i++)
 113         register_valid[i] = 1;
 114       register_valid[FPS_REGNUM] = 1;
 115     }
 116
 117   /* These regs are saved on the stack by the kernel.  Only read them
 118      all (16 ptrace calls!) if we really need them.  */
 119   if (regno == -1)
 120     {
 121       target_xfer_memory (*(CORE_ADDR*)&registers[REGISTER_BYTE (SP_REGNUM)],
 122                           &registers[REGISTER_BYTE (L0_REGNUM)],
 123                           16*REGISTER_RAW_SIZE (L0_REGNUM), 0);
 124       for (i = L0_REGNUM; i <= I7_REGNUM; i++)
 125         register_valid[i] = 1;
 126     }
 127   else if (regno >= L0_REGNUM && regno <= I7_REGNUM)
 128     {
 129       CORE_ADDR sp = *(CORE_ADDR*)&registers[REGISTER_BYTE (SP_REGNUM)];
 130       i = REGISTER_BYTE (regno);
 131       if (register_valid[regno])
 132         printf("register %d valid and read\n", regno);
 133       target_xfer_memory (sp + i - REGISTER_BYTE (L0_REGNUM),
 134                           &registers[i], REGISTER_RAW_SIZE (regno), 0);
 135       register_valid[regno] = 1;
 136     }
 137 }
 138
 139 /* Store our register values back into the inferior.
 140    If REGNO is -1, do this for all registers.
 141    Otherwise, REGNO specifies which register (so we can save time).  */
 142
 143 int
 144 store_inferior_registers (regno)
 145      int regno;
 146 {
 147   struct regs inferior_registers;
 148   struct fp_status inferior_fp_registers;
 149   int wanna_store = INT_REGS + STACK_REGS + FP_REGS;
 150
 151   /* First decide which pieces of machine-state we need to modify.
 152      Default for regno == -1 case is all pieces.  */
 153   if (regno >= 0)
 154     if (FP0_REGNUM <= regno && regno < FP0_REGNUM + 32)
 155       {
 156         wanna_store = FP_REGS;
 157       }
 158     else
 159       {
 160         if (regno == SP_REGNUM)
 161           wanna_store = INT_REGS + STACK_REGS;
 162         else if (regno < L0_REGNUM || regno > I7_REGNUM)
 163           wanna_store = INT_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 0;
 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       bcopy (&registers[REGISTER_BYTE (G1_REGNUM)],
 214              &inferior_registers.r_g1, 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, &inferior_registers))
 226         perror("ptrace_setregs");
 227     }
 228
 229   if (wanna_store & FP_REGS)
 230     {
 231       if (!register_valid[FP0_REGNUM+9]) abort();
 232       bcopy (&registers[REGISTER_BYTE (FP0_REGNUM)],
 233              &inferior_fp_registers,
 234              sizeof inferior_fp_registers.fpu_fr);
 235
 236 /*      bcopy (&registers[REGISTER_BYTE (FPS_REGNUM)],
 237              &inferior_fp_registers.Fpu_fsr,
 238              sizeof (FPU_FSR_TYPE));
 239 ****/
 240       if (0 !=
 241          ptrace (PTRACE_SETFPREGS, inferior_pid, &inferior_fp_registers))
 242          perror("ptrace_setfpregs");
 243     }
 244     return 0;
 245 }
 246 \f
 247 void
 248 fetch_core_registers (core_reg_sect, core_reg_size, which)
 249   char *core_reg_sect;
 250   unsigned core_reg_size;
 251   int which;
 252 {
 253
 254   if (which == 0) {
 255
 256     /* Integer registers */
 257
 258 #define gregs ((struct regs *)core_reg_sect)
 259     /* G0 *always* holds 0.  */
 260     *(int *)&registers[REGISTER_BYTE (0)] = 0;
 261
 262     /* The globals and output registers.  */
 263     bcopy (&gregs->r_g1,
 264            &registers[REGISTER_BYTE (G1_REGNUM)],
 265            15 * REGISTER_RAW_SIZE (G1_REGNUM));
 266     *(int *)&registers[REGISTER_BYTE (PS_REGNUM)] = gregs->r_ps;
 267     *(int *)&registers[REGISTER_BYTE (PC_REGNUM)] = gregs->r_pc;
 268     *(int *)&registers[REGISTER_BYTE (NPC_REGNUM)] = gregs->r_npc;
 269     *(int *)&registers[REGISTER_BYTE (Y_REGNUM)] = gregs->r_y;
 270
 271     /* My best guess at where to get the locals and input
 272        registers is exactly where they usually are, right above
 273        the stack pointer.  If the core dump was caused by a bus error
 274        from blowing away the stack pointer (as is possible) then this
 275        won't work, but it's worth the try. */
 276     {
 277       int sp;
 278
 279       sp = *(int *)&registers[REGISTER_BYTE (SP_REGNUM)];
 280       if (0 != target_read_memory (sp, &registers[REGISTER_BYTE (L0_REGNUM)],
 281                           16 * REGISTER_RAW_SIZE (L0_REGNUM)))
 282         {
 283           /* fprintf so user can still use gdb */
 284           fprintf (stderr,
 285                    "Couldn't read input and local registers from core file\n");
 286         }
 287     }
 288   } else if (which == 2) {
 289
 290     /* Floating point registers */
 291
 292 #define fpuregs  ((struct fpu *) core_reg_sect)
 293     if (core_reg_size >= sizeof (struct fpu))
 294       {
 295         bcopy (fpuregs->fpu_regs,
 296                &registers[REGISTER_BYTE (FP0_REGNUM)],
 297                sizeof (fpuregs->fpu_regs));
 298         bcopy (&fpuregs->fpu_fsr,
 299                &registers[REGISTER_BYTE (FPS_REGNUM)],
 300                sizeof (FPU_FSR_TYPE));
 301       }
 302     else
 303       fprintf (stderr, "Couldn't read float regs from core file\n");
 304   }
 305 }