gdb/sparc-nat.c

   1 /* Functions specific to running gdb native on a SPARC running SunOS4.
   2    Copyright 1989, 1992, 1993, 1994, 1996, 1997, 1998, 1999, 2000, 2001
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23 #include "inferior.h"
  24 #include "target.h"
  25 #include "gdbcore.h"
  26 #include "regcache.h"
  27
  28 #ifdef HAVE_SYS_PARAM_H
  29 #include <sys/param.h>
  30 #endif
  31 #include <signal.h>
  32 #include <sys/ptrace.h>
  33 #include <sys/wait.h>
  34 #ifdef __linux__
  35 #include <asm/reg.h>
  36 #else
  37 #include <machine/reg.h>
  38 #endif
  39 #include <sys/user.h>
  40
  41 /* We don't store all registers immediately when requested, since they
  42    get sent over in large chunks anyway.  Instead, we accumulate most
  43    of the changes and send them over once.  "deferred_stores" keeps
  44    track of which sets of registers we have locally-changed copies of,
  45    so we only need send the groups that have changed.  */
  46
  47 #define INT_REGS        1
  48 #define STACK_REGS      2
  49 #define FP_REGS         4
  50
  51 /* Fetch one or more registers from the inferior.  REGNO == -1 to get
  52    them all.  We actually fetch more than requested, when convenient,
  53    marking them as valid so we won't fetch them again.  */
  54
  55 void
  56 fetch_inferior_registers (int regno)
  57 {
  58   struct regs inferior_registers;
  59   struct fp_status inferior_fp_registers;
  60   int i;
  61
  62   /* We should never be called with deferred stores, because a prerequisite
  63      for writing regs is to have fetched them all (PREPARE_TO_STORE), sigh.  */
  64   if (deferred_stores)
  65     internal_error (__FILE__, __LINE__, "failed internal consistency check");
  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, PIDGET (inferior_ptid),
  79                        (PTRACE_ARG3_TYPE) & inferior_registers, 0))
  80         perror ("ptrace_getregs");
  81
  82       registers[REGISTER_BYTE (0)] = 0;
  83       memcpy (&registers[REGISTER_BYTE (1)], &inferior_registers.r_g1,
  84               15 * REGISTER_RAW_SIZE (G0_REGNUM));
  85       *(int *) &registers[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
  86       *(int *) &registers[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
  87       *(int *) &registers[REGISTER_BYTE (NPC_REGNUM)] = inferior_registers.r_npc;
  88       *(int *) &registers[REGISTER_BYTE (Y_REGNUM)] = inferior_registers.r_y;
  89
  90       for (i = G0_REGNUM; i <= O7_REGNUM; i++)
  91         register_valid[i] = 1;
  92       register_valid[Y_REGNUM] = 1;
  93       register_valid[PS_REGNUM] = 1;
  94       register_valid[PC_REGNUM] = 1;
  95       register_valid[NPC_REGNUM] = 1;
  96       /* If we don't set these valid, read_register_bytes() rereads
  97          all the regs every time it is called!  FIXME.  */
  98       register_valid[WIM_REGNUM] = 1;   /* Not true yet, FIXME */
  99       register_valid[TBR_REGNUM] = 1;   /* Not true yet, FIXME */
 100       register_valid[CPS_REGNUM] = 1;   /* Not true yet, FIXME */
 101     }
 102
 103   /* Floating point registers */
 104   if (regno == -1 ||
 105       regno == FPS_REGNUM ||
 106       (regno >= FP0_REGNUM && regno <= FP0_REGNUM + 31))
 107     {
 108       if (0 != ptrace (PTRACE_GETFPREGS, PIDGET (inferior_ptid),
 109                        (PTRACE_ARG3_TYPE) & inferior_fp_registers,
 110                        0))
 111         perror ("ptrace_getfpregs");
 112       memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers,
 113               sizeof inferior_fp_registers.fpu_fr);
 114       memcpy (&registers[REGISTER_BYTE (FPS_REGNUM)],
 115               &inferior_fp_registers.Fpu_fsr,
 116               sizeof (FPU_FSR_TYPE));
 117       for (i = FP0_REGNUM; i <= FP0_REGNUM + 31; i++)
 118         register_valid[i] = 1;
 119       register_valid[FPS_REGNUM] = 1;
 120     }
 121
 122   /* These regs are saved on the stack by the kernel.  Only read them
 123      all (16 ptrace calls!) if we really need them.  */
 124   if (regno == -1)
 125     {
 126       CORE_ADDR sp = *(unsigned int *) & registers[REGISTER_BYTE (SP_REGNUM)];
 127       target_read_memory (sp, &registers[REGISTER_BYTE (L0_REGNUM)],
 128                           16 * REGISTER_RAW_SIZE (L0_REGNUM));
 129       for (i = L0_REGNUM; i <= I7_REGNUM; i++)
 130         register_valid[i] = 1;
 131     }
 132   else if (regno >= L0_REGNUM && regno <= I7_REGNUM)
 133     {
 134       CORE_ADDR sp = *(unsigned int *) & registers[REGISTER_BYTE (SP_REGNUM)];
 135       i = REGISTER_BYTE (regno);
 136       if (register_valid[regno])
 137         printf_unfiltered ("register %d valid and read\n", regno);
 138       target_read_memory (sp + i - REGISTER_BYTE (L0_REGNUM),
 139                           &registers[i], REGISTER_RAW_SIZE (regno));
 140       register_valid[regno] = 1;
 141     }
 142 }
 143
 144 /* Store our register values back into the inferior.
 145    If REGNO is -1, do this for all registers.
 146    Otherwise, REGNO specifies which register (so we can save time).  */
 147
 148 void
 149 store_inferior_registers (int regno)
 150 {
 151   struct regs inferior_registers;
 152   struct fp_status inferior_fp_registers;
 153   int wanna_store = INT_REGS + STACK_REGS + FP_REGS;
 154
 155   /* First decide which pieces of machine-state we need to modify.
 156      Default for regno == -1 case is all pieces.  */
 157   if (regno >= 0)
 158     if (FP0_REGNUM <= regno && regno < FP0_REGNUM + 32)
 159       {
 160         wanna_store = FP_REGS;
 161       }
 162     else
 163       {
 164         if (regno == SP_REGNUM)
 165           wanna_store = INT_REGS + STACK_REGS;
 166         else if (regno < L0_REGNUM || regno > I7_REGNUM)
 167           wanna_store = INT_REGS;
 168         else if (regno == FPS_REGNUM)
 169           wanna_store = FP_REGS;
 170         else
 171           wanna_store = STACK_REGS;
 172       }
 173
 174   /* See if we're forcing the stores to happen now, or deferring. */
 175   if (regno == -2)
 176     {
 177       wanna_store = deferred_stores;
 178       deferred_stores = 0;
 179     }
 180   else
 181     {
 182       if (wanna_store == STACK_REGS)
 183         {
 184           /* Fall through and just store one stack reg.  If we deferred
 185              it, we'd have to store them all, or remember more info.  */
 186         }
 187       else
 188         {
 189           deferred_stores |= wanna_store;
 190           return;
 191         }
 192     }
 193
 194   if (wanna_store & STACK_REGS)
 195     {
 196       CORE_ADDR sp = *(unsigned int *) & registers[REGISTER_BYTE (SP_REGNUM)];
 197
 198       if (regno < 0 || regno == SP_REGNUM)
 199         {
 200           if (!register_valid[L0_REGNUM + 5])
 201             internal_error (__FILE__, __LINE__, "failed internal consistency check");
 202           target_write_memory (sp,
 203                                &registers[REGISTER_BYTE (L0_REGNUM)],
 204                                16 * REGISTER_RAW_SIZE (L0_REGNUM));
 205         }
 206       else
 207         {
 208           if (!register_valid[regno])
 209             internal_error (__FILE__, __LINE__, "failed internal consistency check");
 210           target_write_memory (sp + REGISTER_BYTE (regno) - REGISTER_BYTE (L0_REGNUM),
 211                                &registers[REGISTER_BYTE (regno)],
 212                                REGISTER_RAW_SIZE (regno));
 213         }
 214
 215     }
 216
 217   if (wanna_store & INT_REGS)
 218     {
 219       if (!register_valid[G1_REGNUM])
 220         internal_error (__FILE__, __LINE__, "failed internal consistency check");
 221
 222       memcpy (&inferior_registers.r_g1, &registers[REGISTER_BYTE (G1_REGNUM)],
 223               15 * REGISTER_RAW_SIZE (G1_REGNUM));
 224
 225       inferior_registers.r_ps =
 226         *(int *) &registers[REGISTER_BYTE (PS_REGNUM)];
 227       inferior_registers.r_pc =
 228         *(int *) &registers[REGISTER_BYTE (PC_REGNUM)];
 229       inferior_registers.r_npc =
 230         *(int *) &registers[REGISTER_BYTE (NPC_REGNUM)];
 231       inferior_registers.r_y =
 232         *(int *) &registers[REGISTER_BYTE (Y_REGNUM)];
 233
 234       if (0 != ptrace (PTRACE_SETREGS, PIDGET (inferior_ptid),
 235                        (PTRACE_ARG3_TYPE) & inferior_registers, 0))
 236         perror ("ptrace_setregs");
 237     }
 238
 239   if (wanna_store & FP_REGS)
 240     {
 241       if (!register_valid[FP0_REGNUM + 9])
 242         internal_error (__FILE__, __LINE__, "failed internal consistency check");
 243       memcpy (&inferior_fp_registers, &registers[REGISTER_BYTE (FP0_REGNUM)],
 244               sizeof inferior_fp_registers.fpu_fr);
 245       memcpy (&inferior_fp_registers.Fpu_fsr,
 246               &registers[REGISTER_BYTE (FPS_REGNUM)], sizeof (FPU_FSR_TYPE));
 247       if (0 !=
 248           ptrace (PTRACE_SETFPREGS, PIDGET (inferior_ptid),
 249                   (PTRACE_ARG3_TYPE) & inferior_fp_registers, 0))
 250         perror ("ptrace_setfpregs");
 251     }
 252 }
 253
 254 /* Provide registers to GDB from a core file.
 255
 256    CORE_REG_SECT points to an array of bytes, which are the contents
 257    of a `note' from a core file which BFD thinks might contain
 258    register contents.  CORE_REG_SIZE is its size.
 259
 260    WHICH says which register set corelow suspects this is:
 261      0 --- the general-purpose register set
 262      2 --- the floating-point register set
 263
 264    IGNORE is unused.  */
 265
 266 static void
 267 fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
 268                       int which, CORE_ADDR ignore)
 269 {
 270
 271   if (which == 0)
 272     {
 273
 274       /* Integer registers */
 275
 276 #define gregs ((struct regs *)core_reg_sect)
 277       /* G0 *always* holds 0.  */
 278       *(int *) &registers[REGISTER_BYTE (0)] = 0;
 279
 280       /* The globals and output registers.  */
 281       memcpy (&registers[REGISTER_BYTE (G1_REGNUM)], &gregs->r_g1,
 282               15 * REGISTER_RAW_SIZE (G1_REGNUM));
 283       *(int *) &registers[REGISTER_BYTE (PS_REGNUM)] = gregs->r_ps;
 284       *(int *) &registers[REGISTER_BYTE (PC_REGNUM)] = gregs->r_pc;
 285       *(int *) &registers[REGISTER_BYTE (NPC_REGNUM)] = gregs->r_npc;
 286       *(int *) &registers[REGISTER_BYTE (Y_REGNUM)] = gregs->r_y;
 287
 288       /* My best guess at where to get the locals and input
 289          registers is exactly where they usually are, right above
 290          the stack pointer.  If the core dump was caused by a bus error
 291          from blowing away the stack pointer (as is possible) then this
 292          won't work, but it's worth the try. */
 293       {
 294         int sp;
 295
 296         sp = *(int *) &registers[REGISTER_BYTE (SP_REGNUM)];
 297         if (0 != target_read_memory (sp, &registers[REGISTER_BYTE (L0_REGNUM)],
 298                                      16 * REGISTER_RAW_SIZE (L0_REGNUM)))
 299           {
 300             /* fprintf_unfiltered so user can still use gdb */
 301             fprintf_unfiltered (gdb_stderr,
 302                 "Couldn't read input and local registers from core file\n");
 303           }
 304       }
 305     }
 306   else if (which == 2)
 307     {
 308
 309       /* Floating point registers */
 310
 311 #define fpuregs  ((struct fpu *) core_reg_sect)
 312       if (core_reg_size >= sizeof (struct fpu))
 313         {
 314           memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], fpuregs->fpu_regs,
 315                   sizeof (fpuregs->fpu_regs));
 316           memcpy (&registers[REGISTER_BYTE (FPS_REGNUM)], &fpuregs->fpu_fsr,
 317                   sizeof (FPU_FSR_TYPE));
 318         }
 319       else
 320         fprintf_unfiltered (gdb_stderr, "Couldn't read float regs from core file\n");
 321     }
 322 }
 323
 324 int
 325 kernel_u_size (void)
 326 {
 327   return (sizeof (struct user));
 328 }
 329 \f
 330
 331 /* Register that we are able to handle sparc core file formats.
 332    FIXME: is this really bfd_target_unknown_flavour? */
 333
 334 static struct core_fns sparc_core_fns =
 335 {
 336   bfd_target_unknown_flavour,           /* core_flavour */
 337   default_check_format,                 /* check_format */
 338   default_core_sniffer,                 /* core_sniffer */
 339   fetch_core_registers,                 /* core_read_registers */
 340   NULL                                  /* next */
 341 };
 342
 343 void
 344 _initialize_core_sparc (void)
 345 {
 346   add_core_fns (&sparc_core_fns);
 347 }