gdb/m88k-nat.c

   1 /* Native-dependent Motorola 88xxx support for GDB, the GNU Debugger.
   2    Copyright 1988, 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., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include "defs.h"
  22 #include "frame.h"
  23 #include "inferior.h"
  24
  25 #include <sys/types.h>
  26 #include <sys/param.h>
  27 #include <sys/dir.h>
  28 #include <signal.h>
  29 #include "gdbcore.h"
  30 #include <sys/user.h>
  31
  32 #ifndef USER                    /* added to support BCS ptrace_user */
  33 #define USER ptrace_user
  34 #endif
  35 #include <sys/ioctl.h>
  36 #include <fcntl.h>
  37 #include <sys/file.h>
  38 #include "gdb_stat.h"
  39
  40 #include "symtab.h"
  41 #include "setjmp.h"
  42 #include "value.h"
  43
  44 #ifdef DELTA88
  45 #include <sys/ptrace.h>
  46
  47 /* define offsets to the pc instruction offsets in ptrace_user struct */
  48 #define SXIP_OFFSET ((char *)&u.pt_sigframe.sig_sxip - (char *)&u)
  49 #define SNIP_OFFSET ((char *)&u.pt_sigframe.sig_snip - (char *)&u)
  50 #define SFIP_OFFSET ((char *)&u.pt_sigframe.sig_sfip - (char *)&u)
  51 #else
  52 /* define offsets to the pc instruction offsets in ptrace_user struct */
  53 #define SXIP_OFFSET ((char *)&u.pt_sigframe.dg_sigframe.sc_sxip - (char *)&u)
  54 #define SNIP_OFFSET ((char *)&u.pt_sigframe.dg_sigframe.sc_snip - (char *)&u)
  55 #define SFIP_OFFSET ((char *)&u.pt_sigframe.dg_sigframe.sc_sfip - (char *)&u)
  56 #endif
  57
  58 extern int have_symbol_file_p ();
  59
  60 extern jmp_buf stack_jmp;
  61
  62 extern int errno;
  63
  64 void
  65 fetch_inferior_registers (regno)
  66      int regno;                 /* Original value discarded */
  67 {
  68   register unsigned int regaddr;
  69   char buf[MAX_REGISTER_RAW_SIZE];
  70   register int i;
  71
  72   struct USER u;
  73   unsigned int offset;
  74
  75   offset = (char *) &u.pt_r0 - (char *) &u;
  76   regaddr = offset;             /* byte offset to r0; */
  77
  78 /*  offset = ptrace (3, inferior_pid, (PTRACE_ARG3_TYPE) offset, 0) - KERNEL_U_ADDR; */
  79   for (regno = 0; regno < NUM_REGS; regno++)
  80     {
  81       /*regaddr = register_addr (regno, offset); */
  82       /* 88k enhancement  */
  83
  84       for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
  85         {
  86           *(int *) &buf[i] = ptrace (3, inferior_pid,
  87                                      (PTRACE_ARG3_TYPE) regaddr, 0);
  88           regaddr += sizeof (int);
  89         }
  90       supply_register (regno, buf);
  91     }
  92   /* now load up registers 36 - 38; special pc registers */
  93   *(int *) &buf[0] = ptrace (3, inferior_pid,
  94                              (PTRACE_ARG3_TYPE) SXIP_OFFSET, 0);
  95   supply_register (SXIP_REGNUM, buf);
  96   *(int *) &buf[0] = ptrace (3, inferior_pid,
  97                              (PTRACE_ARG3_TYPE) SNIP_OFFSET, 0);
  98   supply_register (SNIP_REGNUM, buf);
  99   *(int *) &buf[0] = ptrace (3, inferior_pid,
 100                              (PTRACE_ARG3_TYPE) SFIP_OFFSET, 0);
 101   supply_register (SFIP_REGNUM, buf);
 102 }
 103
 104 /* Store our register values back into the inferior.
 105    If REGNO is -1, do this for all registers.
 106    Otherwise, REGNO specifies which register (so we can save time).  */
 107
 108 void
 109 store_inferior_registers (int regno)
 110 {
 111   register unsigned int regaddr;
 112   char buf[80];
 113
 114   struct USER u;
 115
 116   unsigned int offset = (char *) &u.pt_r0 - (char *) &u;
 117
 118   regaddr = offset;
 119
 120   /* Don't try to deal with EXIP_REGNUM or ENIP_REGNUM, because I think either
 121      svr3 doesn't run on an 88110, or the kernel isolates the different (not
 122      completely sure this is true, but seems to be.  */
 123   if (regno >= 0)
 124     {
 125       /*      regaddr = register_addr (regno, offset); */
 126       if (regno < PC_REGNUM)
 127         {
 128           regaddr = offset + regno * sizeof (int);
 129           errno = 0;
 130           ptrace (6, inferior_pid,
 131                   (PTRACE_ARG3_TYPE) regaddr, read_register (regno));
 132           if (errno != 0)
 133             {
 134               sprintf (buf, "writing register number %d", regno);
 135               perror_with_name (buf);
 136             }
 137         }
 138       else if (regno == SXIP_REGNUM)
 139         ptrace (6, inferior_pid,
 140                 (PTRACE_ARG3_TYPE) SXIP_OFFSET, read_register (regno));
 141       else if (regno == SNIP_REGNUM)
 142         ptrace (6, inferior_pid,
 143                 (PTRACE_ARG3_TYPE) SNIP_OFFSET, read_register (regno));
 144       else if (regno == SFIP_REGNUM)
 145         ptrace (6, inferior_pid,
 146                 (PTRACE_ARG3_TYPE) SFIP_OFFSET, read_register (regno));
 147       else
 148         printf_unfiltered ("Bad register number for store_inferior routine\n");
 149     }
 150   else
 151     {
 152       for (regno = 0; regno < PC_REGNUM; regno++)
 153         {
 154           /*      regaddr = register_addr (regno, offset); */
 155           errno = 0;
 156           regaddr = offset + regno * sizeof (int);
 157           ptrace (6, inferior_pid,
 158                   (PTRACE_ARG3_TYPE) regaddr, read_register (regno));
 159           if (errno != 0)
 160             {
 161               sprintf (buf, "writing register number %d", regno);
 162               perror_with_name (buf);
 163             }
 164         }
 165       ptrace (6, inferior_pid,
 166               (PTRACE_ARG3_TYPE) SXIP_OFFSET, read_register (SXIP_REGNUM));
 167       ptrace (6, inferior_pid,
 168               (PTRACE_ARG3_TYPE) SNIP_OFFSET, read_register (SNIP_REGNUM));
 169       ptrace (6, inferior_pid,
 170               (PTRACE_ARG3_TYPE) SFIP_OFFSET, read_register (SFIP_REGNUM));
 171     }
 172 }
 173
 174
 175 /* blockend is the address of the end of the user structure */
 176 m88k_register_u_addr (int blockend, int regnum)
 177 {
 178   struct USER u;
 179   int ustart = blockend - sizeof (struct USER);
 180   switch (regnum)
 181     {
 182     case 0:
 183     case 1:
 184     case 2:
 185     case 3:
 186     case 4:
 187     case 5:
 188     case 6:
 189     case 7:
 190     case 8:
 191     case 9:
 192     case 10:
 193     case 11:
 194     case 12:
 195     case 13:
 196     case 14:
 197     case 15:
 198     case 16:
 199     case 17:
 200     case 18:
 201     case 19:
 202     case 20:
 203     case 21:
 204     case 22:
 205     case 23:
 206     case 24:
 207     case 25:
 208     case 26:
 209     case 27:
 210     case 28:
 211     case 29:
 212     case 30:
 213     case 31:
 214       return (ustart + ((int) &u.pt_r0 - (int) &u) + REGISTER_SIZE * regnum);
 215     case PSR_REGNUM:
 216       return (ustart + ((int) &u.pt_psr - (int) &u));
 217     case FPSR_REGNUM:
 218       return (ustart + ((int) &u.pt_fpsr - (int) &u));
 219     case FPCR_REGNUM:
 220       return (ustart + ((int) &u.pt_fpcr - (int) &u));
 221     case SXIP_REGNUM:
 222       return (ustart + SXIP_OFFSET);
 223     case SNIP_REGNUM:
 224       return (ustart + SNIP_OFFSET);
 225     case SFIP_REGNUM:
 226       return (ustart + SFIP_OFFSET);
 227     default:
 228       if (regnum < NUM_REGS)
 229         /* The register is one of those which is not defined...
 230            give it zero */
 231         return (ustart + ((int) &u.pt_r0 - (int) &u));
 232       else
 233         return (blockend + REGISTER_SIZE * regnum);
 234     }
 235 }
 236
 237 #ifdef USE_PROC_FS
 238
 239 #include <sys/procfs.h>
 240
 241 /* Prototypes for supply_gregset etc. */
 242 #include "gregset.h"
 243
 244 /*  Given a pointer to a general register set in /proc format (gregset_t *),
 245    unpack the register contents and supply them as gdb's idea of the current
 246    register values. */
 247
 248 void
 249 supply_gregset (gregset_t *gregsetp)
 250 {
 251   register int regi;
 252   register greg_t *regp = (greg_t *) gregsetp;
 253
 254   for (regi = 0; regi <= SP_REGNUM; regi++)
 255     supply_register (regi, (char *) (regp + regi));
 256
 257   supply_register (SXIP_REGNUM, (char *) (regp + R_XIP));
 258   supply_register (SNIP_REGNUM, (char *) (regp + R_NIP));
 259   supply_register (SFIP_REGNUM, (char *) (regp + R_FIP));
 260   supply_register (PSR_REGNUM, (char *) (regp + R_PSR));
 261   supply_register (FPSR_REGNUM, (char *) (regp + R_FPSR));
 262   supply_register (FPCR_REGNUM, (char *) (regp + R_FPCR));
 263 }
 264
 265 void
 266 fill_gregset (gregset_t *gregsetp, int regno)
 267 {
 268   int regi;
 269   register greg_t *regp = (greg_t *) gregsetp;
 270
 271   for (regi = 0; regi <= R_R31; regi++)
 272     if ((regno == -1) || (regno == regi))
 273       *(regp + regi) = *(int *) &registers[REGISTER_BYTE (regi)];
 274
 275   if ((regno == -1) || (regno == SXIP_REGNUM))
 276     *(regp + R_XIP) = *(int *) &registers[REGISTER_BYTE (SXIP_REGNUM)];
 277   if ((regno == -1) || (regno == SNIP_REGNUM))
 278     *(regp + R_NIP) = *(int *) &registers[REGISTER_BYTE (SNIP_REGNUM)];
 279   if ((regno == -1) || (regno == SFIP_REGNUM))
 280     *(regp + R_FIP) = *(int *) &registers[REGISTER_BYTE (SFIP_REGNUM)];
 281   if ((regno == -1) || (regno == PSR_REGNUM))
 282     *(regp + R_PSR) = *(int *) &registers[REGISTER_BYTE (PSR_REGNUM)];
 283   if ((regno == -1) || (regno == FPSR_REGNUM))
 284     *(regp + R_FPSR) = *(int *) &registers[REGISTER_BYTE (FPSR_REGNUM)];
 285   if ((regno == -1) || (regno == FPCR_REGNUM))
 286     *(regp + R_FPCR) = *(int *) &registers[REGISTER_BYTE (FPCR_REGNUM)];
 287 }
 288
 289 #endif /* USE_PROC_FS */