gdb/sparc-nat.c

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