gdb/sparc-nat.c

   1 /* Functions specific to running gdb native on a Sun 4 running sunos4.
   2    Copyright (C) 1989, 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 #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[FPS_REGNUM] = 1;   /* Not true yet, FIXME */
  89       register_valid[CPS_REGNUM] = 1;   /* Not true yet, FIXME */
  90     }
  91
  92   /* Floating point registers */
  93   if (regno == -1 || (regno >= FP0_REGNUM && regno <= FP0_REGNUM + 31))
  94     {
  95       if (0 != ptrace (PTRACE_GETFPREGS, inferior_pid,
  96                        (PTRACE_ARG3_TYPE) &inferior_fp_registers,
  97                        0))
  98             perror("ptrace_getfpregs");
  99       memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers,
 100               sizeof inferior_fp_registers.fpu_fr);
 101       /* memcpy (&registers[REGISTER_BYTE (FPS_REGNUM)],
 102              &inferior_fp_registers.Fpu_fsr,
 103              sizeof (FPU_FSR_TYPE));  FIXME???  -- gnu@cyg */
 104       for (i = FP0_REGNUM; i <= FP0_REGNUM+31; i++)
 105         register_valid[i] = 1;
 106       register_valid[FPS_REGNUM] = 1;
 107     }
 108
 109   /* These regs are saved on the stack by the kernel.  Only read them
 110      all (16 ptrace calls!) if we really need them.  */
 111   if (regno == -1)
 112     {
 113       target_xfer_memory (*(CORE_ADDR*)&registers[REGISTER_BYTE (SP_REGNUM)],
 114                           &registers[REGISTER_BYTE (L0_REGNUM)],
 115                           16*REGISTER_RAW_SIZE (L0_REGNUM), 0);
 116       for (i = L0_REGNUM; i <= I7_REGNUM; i++)
 117         register_valid[i] = 1;
 118     }
 119   else if (regno >= L0_REGNUM && regno <= I7_REGNUM)
 120     {
 121       CORE_ADDR sp = *(CORE_ADDR*)&registers[REGISTER_BYTE (SP_REGNUM)];
 122       i = REGISTER_BYTE (regno);
 123       if (register_valid[regno])
 124         printf("register %d valid and read\n", regno);
 125       target_xfer_memory (sp + i - REGISTER_BYTE (L0_REGNUM),
 126                           &registers[i], REGISTER_RAW_SIZE (regno), 0);
 127       register_valid[regno] = 1;
 128     }
 129 }
 130
 131 /* Store our register values back into the inferior.
 132    If REGNO is -1, do this for all registers.
 133    Otherwise, REGNO specifies which register (so we can save time).  */
 134
 135 void
 136 store_inferior_registers (regno)
 137      int regno;
 138 {
 139   struct regs inferior_registers;
 140   struct fp_status inferior_fp_registers;
 141   int wanna_store = INT_REGS + STACK_REGS + FP_REGS;
 142
 143   /* First decide which pieces of machine-state we need to modify.
 144      Default for regno == -1 case is all pieces.  */
 145   if (regno >= 0)
 146     if (FP0_REGNUM <= regno && regno < FP0_REGNUM + 32)
 147       {
 148         wanna_store = FP_REGS;
 149       }
 150     else
 151       {
 152         if (regno == SP_REGNUM)
 153           wanna_store = INT_REGS + STACK_REGS;
 154         else if (regno < L0_REGNUM || regno > I7_REGNUM)
 155           wanna_store = INT_REGS;
 156         else
 157           wanna_store = STACK_REGS;
 158       }
 159
 160   /* See if we're forcing the stores to happen now, or deferring. */
 161   if (regno == -2)
 162     {
 163       wanna_store = deferred_stores;
 164       deferred_stores = 0;
 165     }
 166   else
 167     {
 168       if (wanna_store == STACK_REGS)
 169         {
 170           /* Fall through and just store one stack reg.  If we deferred
 171              it, we'd have to store them all, or remember more info.  */
 172         }
 173       else
 174         {
 175           deferred_stores |= wanna_store;
 176           return;
 177         }
 178     }
 179
 180   if (wanna_store & STACK_REGS)
 181     {
 182       CORE_ADDR sp = *(CORE_ADDR *)&registers[REGISTER_BYTE (SP_REGNUM)];
 183
 184       if (regno < 0 || regno == SP_REGNUM)
 185         {
 186           if (!register_valid[L0_REGNUM+5]) abort();
 187           target_xfer_memory (sp,
 188                               &registers[REGISTER_BYTE (L0_REGNUM)],
 189                               16*REGISTER_RAW_SIZE (L0_REGNUM), 1);
 190         }
 191       else
 192         {
 193           if (!register_valid[regno]) abort();
 194           target_xfer_memory (sp + REGISTER_BYTE (regno) - REGISTER_BYTE (L0_REGNUM),
 195                               &registers[REGISTER_BYTE (regno)],
 196                               REGISTER_RAW_SIZE (regno), 1);
 197         }
 198
 199     }
 200
 201   if (wanna_store & INT_REGS)
 202     {
 203       if (!register_valid[G1_REGNUM]) abort();
 204
 205       memcpy (&inferior_registers.r_g1, &registers[REGISTER_BYTE (G1_REGNUM)],
 206               15 * REGISTER_RAW_SIZE (G1_REGNUM));
 207
 208       inferior_registers.r_ps =
 209         *(int *)&registers[REGISTER_BYTE (PS_REGNUM)];
 210       inferior_registers.r_pc =
 211         *(int *)&registers[REGISTER_BYTE (PC_REGNUM)];
 212       inferior_registers.r_npc =
 213         *(int *)&registers[REGISTER_BYTE (NPC_REGNUM)];
 214       inferior_registers.r_y =
 215         *(int *)&registers[REGISTER_BYTE (Y_REGNUM)];
 216
 217       if (0 != ptrace (PTRACE_SETREGS, inferior_pid,
 218                        (PTRACE_ARG3_TYPE) &inferior_registers, 0))
 219         perror("ptrace_setregs");
 220     }
 221
 222   if (wanna_store & FP_REGS)
 223     {
 224       if (!register_valid[FP0_REGNUM+9]) abort();
 225       /* Initialize inferior_fp_registers members that gdb doesn't set
 226          by reading them from the inferior.  */
 227       if (0 !=
 228          ptrace (PTRACE_GETFPREGS, inferior_pid,
 229                  (PTRACE_ARG3_TYPE) &inferior_fp_registers, 0))
 230          perror("ptrace_getfpregs");
 231       memcpy (&inferior_fp_registers, &registers[REGISTER_BYTE (FP0_REGNUM)],
 232               sizeof inferior_fp_registers.fpu_fr);
 233
 234 /*    memcpy (&inferior_fp_registers.Fpu_fsr,
 235               &registers[REGISTER_BYTE (FPS_REGNUM)], sizeof (FPU_FSR_TYPE));
 236 ****/
 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 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   unsigned int 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 so user can still use gdb */
 282           fprintf (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 (stderr, "Couldn't read float regs from core file\n");
 300   }
 301 }
 302