gdb/sparc-nat.c

   1 /* Functions specific to running gdb native on a SPARC running SunOS4.
   2    Copyright 1989, 1992, 1993, 1994, 1996 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 #include <sys/user.h>
  29
  30 /* We don't store all registers immediately when requested, since they
  31    get sent over in large chunks anyway.  Instead, we accumulate most
  32    of the changes and send them over once.  "deferred_stores" keeps
  33    track of which sets of registers we have locally-changed copies of,
  34    so we only need send the groups that have changed.  */
  35
  36 #define INT_REGS        1
  37 #define STACK_REGS      2
  38 #define FP_REGS         4
  39
  40 /* Fetch one or more registers from the inferior.  REGNO == -1 to get
  41    them all.  We actually fetch more than requested, when convenient,
  42    marking them as valid so we won't fetch them again.  */
  43
  44 void
  45 fetch_inferior_registers (regno)
  46      int regno;
  47 {
  48   struct regs inferior_registers;
  49   struct fp_status inferior_fp_registers;
  50   int i;
  51
  52   /* We should never be called with deferred stores, because a prerequisite
  53      for writing regs is to have fetched them all (PREPARE_TO_STORE), sigh.  */
  54   if (deferred_stores) abort();
  55
  56   DO_DEFERRED_STORES;
  57
  58   /* Global and Out regs are fetched directly, as well as the control
  59      registers.  If we're getting one of the in or local regs,
  60      and the stack pointer has not yet been fetched,
  61      we have to do that first, since they're found in memory relative
  62      to the stack pointer.  */
  63   if (regno < O7_REGNUM  /* including -1 */
  64       || regno >= Y_REGNUM
  65       || (!register_valid[SP_REGNUM] && regno < I7_REGNUM))
  66     {
  67       if (0 != ptrace (PTRACE_GETREGS, inferior_pid,
  68                        (PTRACE_ARG3_TYPE) &inferior_registers, 0))
  69         perror("ptrace_getregs");
  70
  71       registers[REGISTER_BYTE (0)] = 0;
  72       memcpy (&registers[REGISTER_BYTE (1)], &inferior_registers.r_g1,
  73               15 * REGISTER_RAW_SIZE (G0_REGNUM));
  74       *(int *)&registers[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
  75       *(int *)&registers[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
  76       *(int *)&registers[REGISTER_BYTE (NPC_REGNUM)] = inferior_registers.r_npc;
  77       *(int *)&registers[REGISTER_BYTE (Y_REGNUM)] = inferior_registers.r_y;
  78
  79       for (i = G0_REGNUM; i <= O7_REGNUM; i++)
  80         register_valid[i] = 1;
  81       register_valid[Y_REGNUM] = 1;
  82       register_valid[PS_REGNUM] = 1;
  83       register_valid[PC_REGNUM] = 1;
  84       register_valid[NPC_REGNUM] = 1;
  85       /* If we don't set these valid, read_register_bytes() rereads
  86          all the regs every time it is called!  FIXME.  */
  87       register_valid[WIM_REGNUM] = 1;   /* Not true yet, FIXME */
  88       register_valid[TBR_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 ||
  94       regno == FPS_REGNUM ||
  95       (regno >= FP0_REGNUM && regno <= FP0_REGNUM + 31))
  96     {
  97       if (0 != ptrace (PTRACE_GETFPREGS, inferior_pid,
  98                        (PTRACE_ARG3_TYPE) &inferior_fp_registers,
  99                        0))
 100             perror("ptrace_getfpregs");
 101       memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers,
 102               sizeof inferior_fp_registers.fpu_fr);
 103       memcpy (&registers[REGISTER_BYTE (FPS_REGNUM)],
 104              &inferior_fp_registers.Fpu_fsr,
 105              sizeof (FPU_FSR_TYPE));
 106       for (i = FP0_REGNUM; i <= FP0_REGNUM+31; i++)
 107         register_valid[i] = 1;
 108       register_valid[FPS_REGNUM] = 1;
 109     }
 110
 111   /* These regs are saved on the stack by the kernel.  Only read them
 112      all (16 ptrace calls!) if we really need them.  */
 113   if (regno == -1)
 114     {
 115       target_xfer_memory (*(CORE_ADDR*)&registers[REGISTER_BYTE (SP_REGNUM)],
 116                           &registers[REGISTER_BYTE (L0_REGNUM)],
 117                           16*REGISTER_RAW_SIZE (L0_REGNUM), 0);
 118       for (i = L0_REGNUM; i <= I7_REGNUM; i++)
 119         register_valid[i] = 1;
 120     }
 121   else if (regno >= L0_REGNUM && regno <= I7_REGNUM)
 122     {
 123       CORE_ADDR sp = *(CORE_ADDR*)&registers[REGISTER_BYTE (SP_REGNUM)];
 124       i = REGISTER_BYTE (regno);
 125       if (register_valid[regno])
 126         printf_unfiltered("register %d valid and read\n", regno);
 127       target_xfer_memory (sp + i - REGISTER_BYTE (L0_REGNUM),
 128                           &registers[i], REGISTER_RAW_SIZE (regno), 0);
 129       register_valid[regno] = 1;
 130     }
 131 }
 132
 133 /* Store our register values back into the inferior.
 134    If REGNO is -1, do this for all registers.
 135    Otherwise, REGNO specifies which register (so we can save time).  */
 136
 137 void
 138 store_inferior_registers (regno)
 139      int regno;
 140 {
 141   struct regs inferior_registers;
 142   struct fp_status inferior_fp_registers;
 143   int wanna_store = INT_REGS + STACK_REGS + FP_REGS;
 144
 145   /* First decide which pieces of machine-state we need to modify.
 146      Default for regno == -1 case is all pieces.  */
 147   if (regno >= 0)
 148     if (FP0_REGNUM <= regno && regno < FP0_REGNUM + 32)
 149       {
 150         wanna_store = FP_REGS;
 151       }
 152     else
 153       {
 154         if (regno == SP_REGNUM)
 155           wanna_store = INT_REGS + STACK_REGS;
 156         else if (regno < L0_REGNUM || regno > I7_REGNUM)
 157           wanna_store = INT_REGS;
 158         else if (regno == FPS_REGNUM)
 159           wanna_store = FP_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;
 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       memcpy (&inferior_registers.r_g1, &registers[REGISTER_BYTE (G1_REGNUM)],
 210               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,
 222                        (PTRACE_ARG3_TYPE) &inferior_registers, 0))
 223         perror("ptrace_setregs");
 224     }
 225
 226   if (wanna_store & FP_REGS)
 227     {
 228       if (!register_valid[FP0_REGNUM+9]) abort();
 229       memcpy (&inferior_fp_registers, &registers[REGISTER_BYTE (FP0_REGNUM)],
 230               sizeof inferior_fp_registers.fpu_fr);
 231       memcpy (&inferior_fp_registers.Fpu_fsr,
 232               &registers[REGISTER_BYTE (FPS_REGNUM)], sizeof (FPU_FSR_TYPE));
 233       if (0 !=
 234          ptrace (PTRACE_SETFPREGS, inferior_pid,
 235                  (PTRACE_ARG3_TYPE) &inferior_fp_registers, 0))
 236          perror("ptrace_setfpregs");
 237     }
 238 }
 239
 240
 241 void
 242 fetch_core_registers (core_reg_sect, core_reg_size, which, ignore)
 243   char *core_reg_sect;
 244   unsigned core_reg_size;
 245   int which;
 246   unsigned int ignore;  /* reg addr, unused in this version */
 247 {
 248
 249   if (which == 0) {
 250
 251     /* Integer registers */
 252
 253 #define gregs ((struct regs *)core_reg_sect)
 254     /* G0 *always* holds 0.  */
 255     *(int *)&registers[REGISTER_BYTE (0)] = 0;
 256
 257     /* The globals and output registers.  */
 258     memcpy (&registers[REGISTER_BYTE (G1_REGNUM)], &gregs->r_g1,
 259             15 * REGISTER_RAW_SIZE (G1_REGNUM));
 260     *(int *)&registers[REGISTER_BYTE (PS_REGNUM)] = gregs->r_ps;
 261     *(int *)&registers[REGISTER_BYTE (PC_REGNUM)] = gregs->r_pc;
 262     *(int *)&registers[REGISTER_BYTE (NPC_REGNUM)] = gregs->r_npc;
 263     *(int *)&registers[REGISTER_BYTE (Y_REGNUM)] = gregs->r_y;
 264
 265     /* My best guess at where to get the locals and input
 266        registers is exactly where they usually are, right above
 267        the stack pointer.  If the core dump was caused by a bus error
 268        from blowing away the stack pointer (as is possible) then this
 269        won't work, but it's worth the try. */
 270     {
 271       int sp;
 272
 273       sp = *(int *)&registers[REGISTER_BYTE (SP_REGNUM)];
 274       if (0 != target_read_memory (sp, &registers[REGISTER_BYTE (L0_REGNUM)],
 275                           16 * REGISTER_RAW_SIZE (L0_REGNUM)))
 276         {
 277           /* fprintf_unfiltered so user can still use gdb */
 278           fprintf_unfiltered (gdb_stderr,
 279                    "Couldn't read input and local registers from core file\n");
 280         }
 281     }
 282   } else if (which == 2) {
 283
 284     /* Floating point registers */
 285
 286 #define fpuregs  ((struct fpu *) core_reg_sect)
 287     if (core_reg_size >= sizeof (struct fpu))
 288       {
 289         memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], fpuregs->fpu_regs,
 290                 sizeof (fpuregs->fpu_regs));
 291         memcpy (&registers[REGISTER_BYTE (FPS_REGNUM)], &fpuregs->fpu_fsr,
 292                 sizeof (FPU_FSR_TYPE));
 293       }
 294     else
 295       fprintf_unfiltered (gdb_stderr, "Couldn't read float regs from core file\n");
 296   }
 297 }
 298
 299 int
 300 kernel_u_size ()
 301 {
 302   return (sizeof (struct user));
 303 }