gdb/sun386-xdep.c

   1 /* Machine-dependent code for host Sun 386i's for GDB, the GNU debugger.
   2    Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
   3    Changes for sun386i by Jean Daniel Fekete (jdf@litp.univ-p6-7.fr),
   4    C2V Paris, April 89.
   5
   6 This file is part of GDB.
   7
   8 This program is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2 of the License, or
  11 (at your option) any later version.
  12
  13 This program is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this program; if not, write to the Free Software
  20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  21
  22 #if defined (GDB_TARGET_IS_SUN386)
  23
  24 #include "defs.h"
  25 #include "frame.h"
  26 #include "inferior.h"
  27 #include "gdbcore.h"
  28
  29 #include <sys/param.h>
  30 #include <sys/dir.h>
  31 #include <sys/user.h>
  32 #include <signal.h>
  33 #include <sys/ioctl.h>
  34 #include <fcntl.h>
  35
  36 #include <sys/ptrace.h>
  37 #include <machine/reg.h>
  38
  39 #include <sys/file.h>
  40 #include <sys/stat.h>
  41 #include <sys/core.h>
  42
  43 \f
  44 void
  45 fetch_inferior_registers (regno)
  46      int regno;
  47 {
  48   struct regs inferior_registers;
  49   struct fp_state inferior_fp_registers;
  50   extern char registers[];
  51
  52   registers_fetched ();
  53
  54   ptrace (PTRACE_GETREGS, inferior_pid,
  55           (PTRACE_ARG3_TYPE) &inferior_registers);
  56   ptrace (PTRACE_GETFPREGS, inferior_pid,
  57           (PTRACE_ARG3_TYPE) &inferior_fp_registers);
  58
  59   bcopy (&inferior_registers, registers, sizeof inferior_registers);
  60
  61   bcopy (inferior_fp_registers.f_st,&registers[REGISTER_BYTE (FP0_REGNUM)],
  62          sizeof inferior_fp_registers.f_st);
  63   bcopy (&inferior_fp_registers.f_ctrl,
  64          &registers[REGISTER_BYTE (FPC_REGNUM)],
  65          sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
  66 }
  67
  68 /* Store our register values back into the inferior.
  69    If REGNO is -1, do this for all registers.
  70    Otherwise, REGNO specifies which register (so we can save time).  */
  71
  72 void
  73 store_inferior_registers (regno)
  74      int regno;
  75 {
  76   struct regs inferior_registers;
  77   struct fp_state inferior_fp_registers;
  78   extern char registers[];
  79
  80   bcopy (registers, &inferior_registers, 20 * 4);
  81
  82   bcopy (&registers[REGISTER_BYTE (FP0_REGNUM)],inferior_fp_registers.f_st,
  83          sizeof inferior_fp_registers.f_st);
  84   bcopy (&registers[REGISTER_BYTE (FPC_REGNUM)],
  85          &inferior_fp_registers.f_ctrl,
  86          sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
  87
  88 #ifdef PTRACE_FP_BUG
  89   if (regno == FP_REGNUM || regno == -1)
  90     /* Storing the frame pointer requires a gross hack, in which an
  91        instruction that moves eax into ebp gets single-stepped.  */
  92     {
  93       int stack = inferior_registers.r_reg[SP_REGNUM];
  94       int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid,
  95                           (PTRACE_ARG3_TYPE) stack);
  96       int reg = inferior_registers.r_reg[EAX];
  97       inferior_registers.r_reg[EAX] =
  98         inferior_registers.r_reg[FP_REGNUM];
  99       ptrace (PTRACE_SETREGS, inferior_pid,
 100               (PTRACE_ARG3_TYPE) &inferior_registers);
 101       ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,
 102               0xc589);
 103       ptrace (PTRACE_SINGLESTEP, inferior_pid, (PTRACE_ARG3_TYPE) stack,
 104               0);
 105       wait (0);
 106       ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,
 107               stuff);
 108       inferior_registers.r_reg[EAX] = reg;
 109     }
 110 #endif
 111   ptrace (PTRACE_SETREGS, inferior_pid,
 112           (PTRACE_ARG3_TYPE) &inferior_registers);
 113   ptrace (PTRACE_SETFPREGS, inferior_pid,
 114           (PTRACE_ARG3_TYPE) &inferior_fp_registers);
 115 }
 116
 117 /* Machine-dependent code which would otherwise be in core.c */
 118 /* Work with core files, for GDB. */
 119
 120 \f
 121 void
 122 core_file_command (filename, from_tty)
 123      char *filename;
 124      int from_tty;
 125 {
 126   int val;
 127   extern char registers[];
 128
 129   /* Discard all vestiges of any previous core file
 130      and mark data and stack spaces as empty.  */
 131
 132   if (corefile)
 133     free (corefile);
 134   corefile = 0;
 135
 136   if (corechan >= 0)
 137     close (corechan);
 138   corechan = -1;
 139
 140   data_start = 0;
 141   data_end = 0;
 142   stack_start = STACK_END_ADDR;
 143   stack_end = STACK_END_ADDR;
 144
 145   /* Now, if a new core file was specified, open it and digest it.  */
 146
 147   if (filename)
 148     {
 149       filename = tilde_expand (filename);
 150       make_cleanup (free, filename);
 151
 152       if (have_inferior_p ())
 153         error ("To look at a core file, you must kill the inferior with \"kill\".");
 154       corechan = open (filename, O_RDONLY, 0);
 155       if (corechan < 0)
 156         perror_with_name (filename);
 157
 158       {
 159         struct core corestr;
 160
 161         val = myread (corechan, &corestr, sizeof corestr);
 162         if (val < 0)
 163           perror_with_name (filename);
 164         if (corestr.c_magic != CORE_MAGIC)
 165           error ("\"%s\" does not appear to be a core dump file (magic 0x%x, expected 0x%x)",
 166                  filename, corestr.c_magic, (int) CORE_MAGIC);
 167         else if (sizeof (struct core) != corestr.c_len)
 168           error ("\"%s\" has an invalid struct core length (%d, expected %d)",
 169                  filename, corestr.c_len, (int) sizeof (struct core));
 170
 171         data_start = exec_data_start;
 172         data_end = data_start + corestr.c_dsize;
 173         stack_start = stack_end - corestr.c_ssize;
 174         data_offset = sizeof corestr;
 175         stack_offset = sizeof corestr + corestr.c_dsize;
 176
 177         bcopy (&corestr.c_regs, registers, sizeof corestr.c_regs);
 178
 179         bcopy (corestr.c_fpu.f_fpstatus.f_st,
 180                &registers[REGISTER_BYTE (FP0_REGNUM)],
 181                sizeof corestr.c_fpu.f_fpstatus.f_st);
 182         bcopy (&corestr.c_fpu.f_fpstatus.f_ctrl,
 183                &registers[REGISTER_BYTE (FPC_REGNUM)],
 184                sizeof corestr.c_fpu.f_fpstatus -
 185                sizeof corestr.c_fpu.f_fpstatus.f_st);
 186
 187         /* the struct aouthdr of sun coff is not the struct exec stored
 188            in the core file. */
 189         bcopy (&corestr.c_aouthdr, &core_aouthdr, sizeof (struct exec));
 190 #ifndef COFF_ENCAPSULATE
 191         core_aouthdr.magic = corestr.c_aouthdr.a_info;
 192         core_aouthdr.vstamp = /*SUNVERSION*/ 31252;
 193 #endif
 194         printf ("Core file is from \"%s\".\n", corestr.c_cmdname);
 195         if (corestr.c_signo > 0)
 196           printf ("Program terminated with signal %d, %s.\n",
 197                   corestr.c_signo, safe_strsignal (corestr.c_signo));
 198       }
 199       if (filename[0] == '/')
 200         corefile = savestring (filename, strlen (filename));
 201       else
 202         {
 203           corefile = concat (current_directory, "/", filename, NULL);
 204         }
 205
 206       set_current_frame ( create_new_frame (read_register (FP_REGNUM),
 207                                             read_pc ()));
 208       select_frame (get_current_frame (), 0);
 209
 210       validate_files ();
 211     }
 212   else if (from_tty)
 213     printf ("No core file now.\n");
 214 }
 215
 216 i387_to_double (from, to)
 217      char *from;
 218      char *to;
 219 {
 220   long *lp;
 221   /* push extended mode on 387 stack, then pop in double mode
 222    *
 223    * first, set exception masks so no error is generated -
 224    * number will be rounded to inf or 0, if necessary
 225    */
 226   asm ("pushl %eax");           /* grab a stack slot */
 227   asm ("fstcw (%esp)");         /* get 387 control word */
 228   asm ("movl (%esp),%eax");     /* save old value */
 229   asm ("orl $0x3f,%eax");               /* mask all exceptions */
 230   asm ("pushl %eax");
 231   asm ("fldcw (%esp)");         /* load new value into 387 */
 232
 233   asm ("movl 8(%ebp),%eax");
 234   asm ("fldt (%eax)");          /* push extended number on 387 stack */
 235   asm ("fwait");
 236   asm ("movl 12(%ebp),%eax");
 237   asm ("fstpl (%eax)");         /* pop double */
 238   asm ("fwait");
 239
 240   asm ("popl %eax");            /* flush modified control word */
 241   asm ("fnclex");                       /* clear exceptions */
 242   asm ("fldcw (%esp)");         /* restore original control word */
 243   asm ("popl %eax");            /* flush saved copy */
 244 }
 245
 246 double_to_i387 (from, to)
 247      char *from;
 248      char *to;
 249 {
 250   /* push double mode on 387 stack, then pop in extended mode
 251    * no errors are possible because every 64-bit pattern
 252    * can be converted to an extended
 253    */
 254   asm ("movl 8(%ebp),%eax");
 255   asm ("fldl (%eax)");
 256   asm ("fwait");
 257   asm ("movl 12(%ebp),%eax");
 258   asm ("fstpt (%eax)");
 259   asm ("fwait");
 260 }
 261 #else /* Not sun386 target.  */
 262
 263 /* These functions shouldn't be called when we're cross-debugging.  */
 264
 265 /* ARGSUSED */
 266 void
 267 fetch_inferior_registers (regno)
 268      int regno;
 269 {
 270 }
 271
 272 /* ARGSUSED */
 273 void
 274 store_inferior_registers (regno)
 275      int regno;
 276 {
 277 }
 278
 279 /* ARGSUSED */
 280 void
 281 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
 282      char *core_reg_sect;
 283      unsigned core_reg_size;
 284      int which;
 285      unsigned int reg_addr;     /* Unused in this version */
 286 {
 287 }
 288
 289 #endif /* Not sun386 target.  */