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