gdb/sparc-xdep.c

   1 /* Host-dependent code for SPARC host systems, for GDB, the GNU debugger.
   2    Copyright 1986, 1987, 1989, 1990, 1991, 1992 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 /* This code only compiles when we have the definitions in tm-sparc.h.  */
  21
  22 #define TM_FILE_OVERRIDE
  23 #include "defs.h"
  24 #include "tm-sparc.h"
  25
  26 #include "inferior.h"
  27 #include "target.h"
  28
  29 #include <sys/param.h>
  30 #include <sys/ptrace.h>
  31 #include <machine/reg.h>
  32
  33 #include "gdbcore.h"
  34 #include <sys/core.h>
  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,
  75                        (PTRACE_ARG3_TYPE) &inferior_registers, 0))
  76         perror("ptrace_getregs");
  77
  78       registers[REGISTER_BYTE (0)] = 0;
  79       bcopy (&inferior_registers.r_g1, &registers[REGISTER_BYTE (1)], 15 * REGISTER_RAW_SIZE (G0_REGNUM));
  80       *(int *)&registers[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
  81       *(int *)&registers[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
  82       *(int *)&registers[REGISTER_BYTE (NPC_REGNUM)] = inferior_registers.r_npc;
  83       *(int *)&registers[REGISTER_BYTE (Y_REGNUM)] = inferior_registers.r_y;
  84
  85       for (i = G0_REGNUM; i <= O7_REGNUM; i++)
  86         register_valid[i] = 1;
  87       register_valid[Y_REGNUM] = 1;
  88       register_valid[PS_REGNUM] = 1;
  89       register_valid[PC_REGNUM] = 1;
  90       register_valid[NPC_REGNUM] = 1;
  91       /* If we don't set these valid, read_register_bytes() rereads
  92          all the regs every time it is called!  FIXME.  */
  93       register_valid[WIM_REGNUM] = 1;   /* Not true yet, FIXME */
  94       register_valid[TBR_REGNUM] = 1;   /* Not true yet, FIXME */
  95       register_valid[FPS_REGNUM] = 1;   /* Not true yet, FIXME */
  96       register_valid[CPS_REGNUM] = 1;   /* Not true yet, FIXME */
  97     }
  98
  99   /* Floating point registers */
 100   if (regno == -1 || (regno >= FP0_REGNUM && regno <= FP0_REGNUM + 31))
 101     {
 102       if (0 != ptrace (PTRACE_GETFPREGS, inferior_pid,
 103                        (PTRACE_ARG3_TYPE) &inferior_fp_registers,
 104                        0))
 105             perror("ptrace_getfpregs");
 106       bcopy (&inferior_fp_registers, &registers[REGISTER_BYTE (FP0_REGNUM)],
 107              sizeof inferior_fp_registers.fpu_fr);
 108       /* bcopy (&inferior_fp_registers.Fpu_fsr,
 109              &registers[REGISTER_BYTE (FPS_REGNUM)],
 110              sizeof (FPU_FSR_TYPE));  FIXME???  -- gnu@cyg */
 111       for (i = FP0_REGNUM; i <= FP0_REGNUM+31; i++)
 112         register_valid[i] = 1;
 113       register_valid[FPS_REGNUM] = 1;
 114     }
 115
 116   /* These regs are saved on the stack by the kernel.  Only read them
 117      all (16 ptrace calls!) if we really need them.  */
 118   if (regno == -1)
 119     {
 120       target_xfer_memory (*(CORE_ADDR*)&registers[REGISTER_BYTE (SP_REGNUM)],
 121                           &registers[REGISTER_BYTE (L0_REGNUM)],
 122                           16*REGISTER_RAW_SIZE (L0_REGNUM), 0);
 123       for (i = L0_REGNUM; i <= I7_REGNUM; i++)
 124         register_valid[i] = 1;
 125     }
 126   else if (regno >= L0_REGNUM && regno <= I7_REGNUM)
 127     {
 128       CORE_ADDR sp = *(CORE_ADDR*)&registers[REGISTER_BYTE (SP_REGNUM)];
 129       i = REGISTER_BYTE (regno);
 130       if (register_valid[regno])
 131         printf("register %d valid and read\n", regno);
 132       target_xfer_memory (sp + i - REGISTER_BYTE (L0_REGNUM),
 133                           &registers[i], REGISTER_RAW_SIZE (regno), 0);
 134       register_valid[regno] = 1;
 135     }
 136 }
 137
 138 /* Store our register values back into the inferior.
 139    If REGNO is -1, do this for all registers.
 140    Otherwise, REGNO specifies which register (so we can save time).  */
 141
 142 void
 143 store_inferior_registers (regno)
 144      int regno;
 145 {
 146   struct regs inferior_registers;
 147   struct fp_status inferior_fp_registers;
 148   int wanna_store = INT_REGS + STACK_REGS + FP_REGS;
 149
 150   /* First decide which pieces of machine-state we need to modify.
 151      Default for regno == -1 case is all pieces.  */
 152   if (regno >= 0)
 153     if (FP0_REGNUM <= regno && regno < FP0_REGNUM + 32)
 154       {
 155         wanna_store = FP_REGS;
 156       }
 157     else
 158       {
 159         if (regno == SP_REGNUM)
 160           wanna_store = INT_REGS + STACK_REGS;
 161         else if (regno < L0_REGNUM || regno > I7_REGNUM)
 162           wanna_store = INT_REGS;
 163         else
 164           wanna_store = STACK_REGS;
 165       }
 166
 167   /* See if we're forcing the stores to happen now, or deferring. */
 168   if (regno == -2)
 169     {
 170       wanna_store = deferred_stores;
 171       deferred_stores = 0;
 172     }
 173   else
 174     {
 175       if (wanna_store == STACK_REGS)
 176         {
 177           /* Fall through and just store one stack reg.  If we deferred
 178              it, we'd have to store them all, or remember more info.  */
 179         }
 180       else
 181         {
 182           deferred_stores |= wanna_store;
 183           return;
 184         }
 185     }
 186
 187   if (wanna_store & STACK_REGS)
 188     {
 189       CORE_ADDR sp = *(CORE_ADDR *)&registers[REGISTER_BYTE (SP_REGNUM)];
 190
 191       if (regno < 0 || regno == SP_REGNUM)
 192         {
 193           if (!register_valid[L0_REGNUM+5]) abort();
 194           target_xfer_memory (sp,
 195                               &registers[REGISTER_BYTE (L0_REGNUM)],
 196                               16*REGISTER_RAW_SIZE (L0_REGNUM), 1);
 197         }
 198       else
 199         {
 200           if (!register_valid[regno]) abort();
 201           target_xfer_memory (sp + REGISTER_BYTE (regno) - REGISTER_BYTE (L0_REGNUM),
 202                               &registers[REGISTER_BYTE (regno)],
 203                               REGISTER_RAW_SIZE (regno), 1);
 204         }
 205
 206     }
 207
 208   if (wanna_store & INT_REGS)
 209     {
 210       if (!register_valid[G1_REGNUM]) abort();
 211
 212       bcopy (&registers[REGISTER_BYTE (G1_REGNUM)],
 213              &inferior_registers.r_g1, 15 * REGISTER_RAW_SIZE (G1_REGNUM));
 214
 215       inferior_registers.r_ps =
 216         *(int *)&registers[REGISTER_BYTE (PS_REGNUM)];
 217       inferior_registers.r_pc =
 218         *(int *)&registers[REGISTER_BYTE (PC_REGNUM)];
 219       inferior_registers.r_npc =
 220         *(int *)&registers[REGISTER_BYTE (NPC_REGNUM)];
 221       inferior_registers.r_y =
 222         *(int *)&registers[REGISTER_BYTE (Y_REGNUM)];
 223
 224       if (0 != ptrace (PTRACE_SETREGS, inferior_pid,
 225                        (PTRACE_ARG3_TYPE) &inferior_registers, 0))
 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,
 242                  (PTRACE_ARG3_TYPE) &inferior_fp_registers, 0))
 243          perror("ptrace_setfpregs");
 244     }
 245 }
 246 \f
 247 void
 248 fetch_core_registers (core_reg_sect, core_reg_size, which, ignore)
 249   char *core_reg_sect;
 250   unsigned core_reg_size;
 251   int which;
 252   unsigned int ignore;  /* reg addr, unused in this version */
 253 {
 254
 255   if (which == 0) {
 256
 257     /* Integer registers */
 258
 259 #define gregs ((struct regs *)core_reg_sect)
 260     /* G0 *always* holds 0.  */
 261     *(int *)&registers[REGISTER_BYTE (0)] = 0;
 262
 263     /* The globals and output registers.  */
 264     bcopy (&gregs->r_g1,
 265            &registers[REGISTER_BYTE (G1_REGNUM)],
 266            15 * REGISTER_RAW_SIZE (G1_REGNUM));
 267     *(int *)&registers[REGISTER_BYTE (PS_REGNUM)] = gregs->r_ps;
 268     *(int *)&registers[REGISTER_BYTE (PC_REGNUM)] = gregs->r_pc;
 269     *(int *)&registers[REGISTER_BYTE (NPC_REGNUM)] = gregs->r_npc;
 270     *(int *)&registers[REGISTER_BYTE (Y_REGNUM)] = gregs->r_y;
 271
 272     /* My best guess at where to get the locals and input
 273        registers is exactly where they usually are, right above
 274        the stack pointer.  If the core dump was caused by a bus error
 275        from blowing away the stack pointer (as is possible) then this
 276        won't work, but it's worth the try. */
 277     {
 278       int sp;
 279
 280       sp = *(int *)&registers[REGISTER_BYTE (SP_REGNUM)];
 281       if (0 != target_read_memory (sp, &registers[REGISTER_BYTE (L0_REGNUM)],
 282                           16 * REGISTER_RAW_SIZE (L0_REGNUM)))
 283         {
 284           /* fprintf so user can still use gdb */
 285           fprintf (stderr,
 286                    "Couldn't read input and local registers from core file\n");
 287         }
 288     }
 289   } else if (which == 2) {
 290
 291     /* Floating point registers */
 292
 293 #define fpuregs  ((struct fpu *) core_reg_sect)
 294     if (core_reg_size >= sizeof (struct fpu))
 295       {
 296         bcopy (fpuregs->fpu_regs,
 297                &registers[REGISTER_BYTE (FP0_REGNUM)],
 298                sizeof (fpuregs->fpu_regs));
 299         bcopy (&fpuregs->fpu_fsr,
 300                &registers[REGISTER_BYTE (FPS_REGNUM)],
 301                sizeof (FPU_FSR_TYPE));
 302       }
 303     else
 304       fprintf (stderr, "Couldn't read float regs from core file\n");
 305   }
 306 }