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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #include "defs.h"
  21 #include "frame.h"
  22 #include "inferior.h"
  23
  24 #include <sys/types.h>
  25 #include <sys/param.h>
  26 #include <sys/dir.h>
  27 #include <signal.h>
  28 #include "gdbcore.h"
  29 #include <sys/user.h>
  30
  31 #ifndef USER                    /* added to support BCS ptrace_user */
  32 #define USER ptrace_user
  33 #endif
  34 #include <sys/ioctl.h>
  35 #include <fcntl.h>
  36 #include <sys/file.h>
  37 #include <sys/stat.h>
  38
  39 #include "symtab.h"
  40 #include "setjmp.h"
  41 #include "value.h"
  42
  43 #ifdef DELTA88
  44 #include <sys/ptrace.h>
  45
  46 /* define offsets to the pc instruction offsets in ptrace_user struct */
  47 #define SXIP_OFFSET ((char *)&u.pt_sigframe.sig_sxip - (char *)&u)
  48 #define SNIP_OFFSET ((char *)&u.pt_sigframe.sig_snip - (char *)&u)
  49 #define SFIP_OFFSET ((char *)&u.pt_sigframe.sig_sfip - (char *)&u)
  50 #else
  51 /* define offsets to the pc instruction offsets in ptrace_user struct */
  52 #define SXIP_OFFSET ((char *)&u.pt_sigframe.dg_sigframe.sc_sxip - (char *)&u)
  53 #define SNIP_OFFSET ((char *)&u.pt_sigframe.dg_sigframe.sc_snip - (char *)&u)
  54 #define SFIP_OFFSET ((char *)&u.pt_sigframe.dg_sigframe.sc_sfip - (char *)&u)
  55 #endif
  56
  57 extern int have_symbol_file_p();
  58
  59 extern jmp_buf stack_jmp;
  60
  61 extern int errno;
  62 extern char registers[REGISTER_BYTES];
  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 (regno)
 110      int regno;
 111 {
 112   register unsigned int regaddr;
 113   char buf[80];
 114
 115   struct USER u;
 116
 117   unsigned int offset = (char *) &u.pt_r0 - (char *) &u;
 118
 119   regaddr = offset;
 120
 121   /* Don't try to deal with EXIP_REGNUM or ENIP_REGNUM, because I think either
 122      svr3 doesn't run on an 88110, or the kernel isolates the different (not
 123      completely sure this is true, but seems to be.  */
 124   if (regno >= 0)
 125     {
 126       /*      regaddr = register_addr (regno, offset); */
 127       if (regno < PC_REGNUM)
 128         {
 129           regaddr = offset + regno * sizeof (int);
 130           errno = 0;
 131           ptrace (6, inferior_pid,
 132                   (PTRACE_ARG3_TYPE) regaddr, read_register (regno));
 133           if (errno != 0)
 134             {
 135               sprintf (buf, "writing register number %d", regno);
 136               perror_with_name (buf);
 137             }
 138         }
 139       else if (regno == SXIP_REGNUM)
 140         ptrace (6, inferior_pid,
 141                 (PTRACE_ARG3_TYPE) SXIP_OFFSET, read_register(regno));
 142       else if (regno == SNIP_REGNUM)
 143         ptrace (6, inferior_pid,
 144                 (PTRACE_ARG3_TYPE) SNIP_OFFSET, read_register(regno));
 145       else if (regno == SFIP_REGNUM)
 146         ptrace (6, inferior_pid,
 147                 (PTRACE_ARG3_TYPE) SFIP_OFFSET, read_register(regno));
 148       else
 149         printf_unfiltered ("Bad register number for store_inferior routine\n");
 150     }
 151   else
 152     {
 153       for (regno = 0; regno < PC_REGNUM; regno++)
 154         {
 155           /*      regaddr = register_addr (regno, offset); */
 156           errno = 0;
 157           regaddr = offset + regno * sizeof (int);
 158           ptrace (6, inferior_pid,
 159                   (PTRACE_ARG3_TYPE) regaddr, read_register (regno));
 160           if (errno != 0)
 161             {
 162               sprintf (buf, "writing register number %d", regno);
 163               perror_with_name (buf);
 164             }
 165         }
 166       ptrace (6,inferior_pid,
 167               (PTRACE_ARG3_TYPE) SXIP_OFFSET,read_register(SXIP_REGNUM));
 168       ptrace (6,inferior_pid,
 169               (PTRACE_ARG3_TYPE) SNIP_OFFSET,read_register(SNIP_REGNUM));
 170       ptrace (6,inferior_pid,
 171               (PTRACE_ARG3_TYPE) SFIP_OFFSET,read_register(SFIP_REGNUM));
 172     }
 173 }
 174
 175
 176 /* blockend is the address of the end of the user structure */
 177 m88k_register_u_addr (blockend, regnum)
 178 {
 179   struct USER u;
 180   int ustart = blockend - sizeof (struct USER);
 181   switch (regnum)
 182     {
 183     case 0:
 184     case 1:
 185     case 2:
 186     case 3:
 187     case 4:
 188     case 5:
 189     case 6:
 190     case 7:
 191     case 8:
 192     case 9:
 193     case 10:
 194     case 11:
 195     case 12:
 196     case 13:
 197     case 14:
 198     case 15:
 199     case 16:
 200     case 17:
 201     case 18:
 202     case 19:
 203     case 20:
 204     case 21:
 205     case 22:
 206     case 23:
 207     case 24:
 208     case 25:
 209     case 26:
 210     case 27:
 211     case 28:
 212     case 29:
 213     case 30:
 214     case 31:          return (ustart + ((int) &u.pt_r0 - (int) &u) + sizeof(REGISTER_TYPE) * regnum);
 215     case PSR_REGNUM:  return (ustart + ((int) &u.pt_psr - (int) &u));
 216     case FPSR_REGNUM: return (ustart + ((int) &u.pt_fpsr - (int) &u));
 217     case FPCR_REGNUM: return (ustart + ((int) &u.pt_fpcr - (int) &u));
 218     case SXIP_REGNUM: return (ustart + SXIP_OFFSET);
 219     case SNIP_REGNUM: return (ustart + SNIP_OFFSET);
 220     case SFIP_REGNUM: return (ustart + SFIP_OFFSET);
 221     default:
 222         if (regnum < NUM_REGS)
 223             /* The register is one of those which is not defined...
 224                give it zero */
 225             return (ustart + ((int) &u.pt_r0 - (int) &u));
 226         else
 227             return (blockend + sizeof (REGISTER_TYPE) * regnum);
 228     }
 229 }
 230
 231 #ifdef USE_PROC_FS
 232
 233 #include <sys/procfs.h>
 234
 235 /*  Given a pointer to a general register set in /proc format (gregset_t *),
 236     unpack the register contents and supply them as gdb's idea of the current
 237     register values. */
 238
 239 void
 240 supply_gregset (gregsetp)
 241      gregset_t *gregsetp;
 242 {
 243     register int regi;
 244     register greg_t *regp = (greg_t *) gregsetp;
 245
 246     for (regi=0; regi <= SP_REGNUM; regi++)
 247         supply_register (regi, (char *) (regp + regi));
 248
 249     supply_register (SXIP_REGNUM, (char *) (regp + R_XIP));
 250     supply_register (SNIP_REGNUM, (char *) (regp + R_NIP));
 251     supply_register (SFIP_REGNUM, (char *) (regp + R_FIP));
 252     supply_register (PSR_REGNUM, (char *) (regp + R_PSR));
 253     supply_register (FPSR_REGNUM, (char *) (regp + R_FPSR));
 254     supply_register (FPCR_REGNUM, (char *) (regp + R_FPCR));
 255 }
 256
 257 void
 258 fill_gregset (gregsetp, regno)
 259      gregset_t *gregsetp;
 260      int regno;
 261 {
 262     int regi;
 263     register greg_t *regp = (greg_t *) gregsetp;
 264     extern char registers[];
 265
 266     for (regi = 0 ; regi <= R_R31 ; regi++)
 267         if ((regno == -1) || (regno == regi))
 268             *(regp + regi) = *(int *) &registers[REGISTER_BYTE(regi)];
 269
 270     if ((regno == -1) || (regno == SXIP_REGNUM))
 271         *(regp + R_XIP) = *(int *) &registers[REGISTER_BYTE(SXIP_REGNUM)];
 272     if ((regno == -1) || (regno == SNIP_REGNUM))
 273         *(regp + R_NIP) = *(int *) &registers[REGISTER_BYTE(SNIP_REGNUM)];
 274     if ((regno == -1) || (regno == SFIP_REGNUM))
 275         *(regp + R_FIP) = *(int *) &registers[REGISTER_BYTE(SFIP_REGNUM)];
 276     if ((regno == -1) || (regno == PSR_REGNUM))
 277         *(regp + R_PSR) = *(int *) &registers[REGISTER_BYTE(PSR_REGNUM)];
 278     if ((regno == -1) || (regno == FPSR_REGNUM))
 279         *(regp + R_FPSR) = *(int *) &registers[REGISTER_BYTE(FPSR_REGNUM)];
 280     if ((regno == -1) || (regno == FPCR_REGNUM))
 281         *(regp + R_FPCR) = *(int *) &registers[REGISTER_BYTE(FPCR_REGNUM)];
 282 }
 283
 284 #endif /* USE_PROC_FS */