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 "signame.h"
  28 #include "gdbcore.h"
  29
  30 #include <sys/param.h>
  31 #include <sys/dir.h>
  32 #include <sys/user.h>
  33 #include <signal.h>
  34 #include <sys/ioctl.h>
  35 #include <fcntl.h>
  36
  37 #include <sys/ptrace.h>
  38 #include <machine/reg.h>
  39
  40 #include <sys/file.h>
  41 #include <sys/stat.h>
  42 #include <sys/core.h>
  43
  44 \f
  45 void
  46 fetch_inferior_registers (regno)
  47      int regno;
  48 {
  49   struct regs inferior_registers;
  50   struct fp_state inferior_fp_registers;
  51   extern char registers[];
  52
  53   registers_fetched ();
  54
  55   ptrace (PTRACE_GETREGS, inferior_pid, &inferior_registers);
  56   ptrace (PTRACE_GETFPREGS, inferior_pid, &inferior_fp_registers);
  57
  58   bcopy (&inferior_registers, registers, sizeof inferior_registers);
  59
  60   bcopy (inferior_fp_registers.f_st,&registers[REGISTER_BYTE (FP0_REGNUM)],
  61          sizeof inferior_fp_registers.f_st);
  62   bcopy (&inferior_fp_registers.f_ctrl,
  63          &registers[REGISTER_BYTE (FPC_REGNUM)],
  64          sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
  65 }
  66
  67 /* Store our register values back into the inferior.
  68    If REGNO is -1, do this for all registers.
  69    Otherwise, REGNO specifies which register (so we can save time).  */
  70
  71 void
  72 store_inferior_registers (regno)
  73      int regno;
  74 {
  75   struct regs inferior_registers;
  76   struct fp_state inferior_fp_registers;
  77   extern char registers[];
  78
  79   bcopy (registers, &inferior_registers, 20 * 4);
  80
  81   bcopy (&registers[REGISTER_BYTE (FP0_REGNUM)],inferior_fp_registers.f_st,
  82          sizeof inferior_fp_registers.f_st);
  83   bcopy (&registers[REGISTER_BYTE (FPC_REGNUM)],
  84          &inferior_fp_registers.f_ctrl,
  85          sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
  86
  87 #ifdef PTRACE_FP_BUG
  88   if (regno == FP_REGNUM || regno == -1)
  89     /* Storing the frame pointer requires a gross hack, in which an
  90        instruction that moves eax into ebp gets single-stepped.  */
  91     {
  92       int stack = inferior_registers.r_reg[SP_REGNUM];
  93       int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid, stack);
  94       int reg = inferior_registers.r_reg[EAX];
  95       inferior_registers.r_reg[EAX] =
  96         inferior_registers.r_reg[FP_REGNUM];
  97       ptrace (PTRACE_SETREGS, inferior_pid, &inferior_registers);
  98       ptrace (PTRACE_POKEDATA, inferior_pid, stack, 0xc589);
  99       ptrace (PTRACE_SINGLESTEP, inferior_pid, stack, 0);
 100       wait (0);
 101       ptrace (PTRACE_POKEDATA, inferior_pid, stack, stuff);
 102       inferior_registers.r_reg[EAX] = reg;
 103     }
 104 #endif
 105   ptrace (PTRACE_SETREGS, inferior_pid, &inferior_registers);
 106   ptrace (PTRACE_SETFPREGS, inferior_pid, &inferior_fp_registers);
 107 }
 108
 109 /* Machine-dependent code which would otherwise be in core.c */
 110 /* Work with core files, for GDB. */
 111
 112 \f
 113 void
 114 core_file_command (filename, from_tty)
 115      char *filename;
 116      int from_tty;
 117 {
 118   int val;
 119   extern char registers[];
 120
 121   /* Discard all vestiges of any previous core file
 122      and mark data and stack spaces as empty.  */
 123
 124   if (corefile)
 125     free (corefile);
 126   corefile = 0;
 127
 128   if (corechan >= 0)
 129     close (corechan);
 130   corechan = -1;
 131
 132   data_start = 0;
 133   data_end = 0;
 134   stack_start = STACK_END_ADDR;
 135   stack_end = STACK_END_ADDR;
 136
 137   /* Now, if a new core file was specified, open it and digest it.  */
 138
 139   if (filename)
 140     {
 141       filename = tilde_expand (filename);
 142       make_cleanup (free, filename);
 143
 144       if (have_inferior_p ())
 145         error ("To look at a core file, you must kill the inferior with \"kill\".");
 146       corechan = open (filename, O_RDONLY, 0);
 147       if (corechan < 0)
 148         perror_with_name (filename);
 149
 150       {
 151         struct core corestr;
 152
 153         val = myread (corechan, &corestr, sizeof corestr);
 154         if (val < 0)
 155           perror_with_name (filename);
 156         if (corestr.c_magic != CORE_MAGIC)
 157           error ("\"%s\" does not appear to be a core dump file (magic 0x%x, expected 0x%x)",
 158                  filename, corestr.c_magic, (int) CORE_MAGIC);
 159         else if (sizeof (struct core) != corestr.c_len)
 160           error ("\"%s\" has an invalid struct core length (%d, expected %d)",
 161                  filename, corestr.c_len, (int) sizeof (struct core));
 162
 163         data_start = exec_data_start;
 164         data_end = data_start + corestr.c_dsize;
 165         stack_start = stack_end - corestr.c_ssize;
 166         data_offset = sizeof corestr;
 167         stack_offset = sizeof corestr + corestr.c_dsize;
 168
 169         bcopy (&corestr.c_regs, registers, sizeof corestr.c_regs);
 170
 171         bcopy (corestr.c_fpu.f_fpstatus.f_st,
 172                &registers[REGISTER_BYTE (FP0_REGNUM)],
 173                sizeof corestr.c_fpu.f_fpstatus.f_st);
 174         bcopy (&corestr.c_fpu.f_fpstatus.f_ctrl,
 175                &registers[REGISTER_BYTE (FPC_REGNUM)],
 176                sizeof corestr.c_fpu.f_fpstatus -
 177                sizeof corestr.c_fpu.f_fpstatus.f_st);
 178
 179         /* the struct aouthdr of sun coff is not the struct exec stored
 180            in the core file. */
 181         bcopy (&corestr.c_aouthdr, &core_aouthdr, sizeof (struct exec));
 182 #ifndef COFF_ENCAPSULATE
 183         core_aouthdr.magic = corestr.c_aouthdr.a_info;
 184         core_aouthdr.vstamp = /*SUNVERSION*/ 31252;
 185 #endif
 186         printf ("Core file is from \"%s\".\n", corestr.c_cmdname);
 187         if (corestr.c_signo > 0)
 188           printf ("Program terminated with signal %d, %s.\n",
 189                         corestr.c_signo,
 190                         corestr.c_signo < NSIG
 191                         ? sys_siglist[corestr.c_signo]
 192                         : "(undocumented)");
 193       }
 194       if (filename[0] == '/')
 195         corefile = savestring (filename, strlen (filename));
 196       else
 197         {
 198           corefile = concat (current_directory, "/", filename, NULL);
 199         }
 200
 201       set_current_frame ( create_new_frame (read_register (FP_REGNUM),
 202                                             read_pc ()));
 203       select_frame (get_current_frame (), 0);
 204
 205       validate_files ();
 206     }
 207   else if (from_tty)
 208     printf ("No core file now.\n");
 209 }
 210
 211 i387_to_double (from, to)
 212      char *from;
 213      char *to;
 214 {
 215   long *lp;
 216   /* push extended mode on 387 stack, then pop in double mode
 217    *
 218    * first, set exception masks so no error is generated -
 219    * number will be rounded to inf or 0, if necessary
 220    */
 221   asm ("pushl %eax");           /* grab a stack slot */
 222   asm ("fstcw (%esp)");         /* get 387 control word */
 223   asm ("movl (%esp),%eax");     /* save old value */
 224   asm ("orl $0x3f,%eax");               /* mask all exceptions */
 225   asm ("pushl %eax");
 226   asm ("fldcw (%esp)");         /* load new value into 387 */
 227
 228   asm ("movl 8(%ebp),%eax");
 229   asm ("fldt (%eax)");          /* push extended number on 387 stack */
 230   asm ("fwait");
 231   asm ("movl 12(%ebp),%eax");
 232   asm ("fstpl (%eax)");         /* pop double */
 233   asm ("fwait");
 234
 235   asm ("popl %eax");            /* flush modified control word */
 236   asm ("fnclex");                       /* clear exceptions */
 237   asm ("fldcw (%esp)");         /* restore original control word */
 238   asm ("popl %eax");            /* flush saved copy */
 239 }
 240
 241 double_to_i387 (from, to)
 242      char *from;
 243      char *to;
 244 {
 245   /* push double mode on 387 stack, then pop in extended mode
 246    * no errors are possible because every 64-bit pattern
 247    * can be converted to an extended
 248    */
 249   asm ("movl 8(%ebp),%eax");
 250   asm ("fldl (%eax)");
 251   asm ("fwait");
 252   asm ("movl 12(%ebp),%eax");
 253   asm ("fstpt (%eax)");
 254   asm ("fwait");
 255 }
 256 #else /* Not sun386 target.  */
 257
 258 /* These functions shouldn't be called when we're cross-debugging.  */
 259
 260 /* ARGSUSED */
 261 void
 262 fetch_inferior_registers (regno)
 263      int regno;
 264 {
 265 }
 266
 267 /* ARGSUSED */
 268 void
 269 store_inferior_registers (regno)
 270      int regno;
 271 {
 272 }
 273
 274 /* ARGSUSED */
 275 void
 276 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
 277      char *core_reg_sect;
 278      unsigned core_reg_size;
 279      int which;
 280      unsigned int reg_addr;     /* Unused in this version */
 281 {
 282 }
 283
 284 #endif /* Not sun386 target.  */