gdb/sun386-nat.c

   1 /* Native support for Sun 386i's for GDB, the GNU debugger.
   2    Copyright (C) 1986, 1987, 1989, 1991, 1992 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23 #include "frame.h"
  24 #include "inferior.h"
  25 #include "gdbcore.h"
  26
  27 #include <sys/param.h>
  28 #include <sys/dir.h>
  29 #include <sys/user.h>
  30 #include <signal.h>
  31 #include <sys/ioctl.h>
  32 #include <fcntl.h>
  33
  34 #include <sys/ptrace.h>
  35 #include <machine/reg.h>
  36
  37 #include <sys/file.h>
  38 #include "gdb_stat.h"
  39 #include <sys/core.h>
  40
  41 \f
  42 /* Machine-dependent code which would otherwise be in corefile.c */
  43 /* Work with core files, for GDB. */
  44
  45 \f
  46 void
  47 core_file_command (filename, from_tty)
  48      char *filename;
  49      int from_tty;
  50 {
  51   int val;
  52
  53   /* Discard all vestiges of any previous core file
  54      and mark data and stack spaces as empty.  */
  55
  56   if (corefile)
  57     free (corefile);
  58   corefile = 0;
  59
  60   if (corechan >= 0)
  61     close (corechan);
  62   corechan = -1;
  63
  64   data_start = 0;
  65   data_end = 0;
  66   stack_start = STACK_END_ADDR;
  67   stack_end = STACK_END_ADDR;
  68
  69   /* Now, if a new core file was specified, open it and digest it.  */
  70
  71   if (filename)
  72     {
  73       filename = tilde_expand (filename);
  74       make_cleanup (free, filename);
  75
  76       if (have_inferior_p ())
  77         error ("To look at a core file, you must kill the program with \"kill\".");
  78       corechan = open (filename, O_RDONLY, 0);
  79       if (corechan < 0)
  80         perror_with_name (filename);
  81
  82       {
  83         struct core corestr;
  84
  85         val = myread (corechan, &corestr, sizeof corestr);
  86         if (val < 0)
  87           perror_with_name (filename);
  88         if (corestr.c_magic != CORE_MAGIC)
  89           error ("\"%s\" does not appear to be a core dump file (magic 0x%x, expected 0x%x)",
  90                  filename, corestr.c_magic, (int) CORE_MAGIC);
  91         else if (sizeof (struct core) != corestr.c_len)
  92           error ("\"%s\" has an invalid struct core length (%d, expected %d)",
  93                  filename, corestr.c_len, (int) sizeof (struct core));
  94
  95         data_start = exec_data_start;
  96         data_end = data_start + corestr.c_dsize;
  97         stack_start = stack_end - corestr.c_ssize;
  98         data_offset = sizeof corestr;
  99         stack_offset = sizeof corestr + corestr.c_dsize;
 100
 101         memcpy (registers, &corestr.c_regs, sizeof corestr.c_regs);
 102
 103         memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)],
 104                corestr.c_fpu.f_fpstatus.f_st,
 105                sizeof corestr.c_fpu.f_fpstatus.f_st);
 106         memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],
 107                &corestr.c_fpu.f_fpstatus.f_ctrl,
 108                sizeof corestr.c_fpu.f_fpstatus -
 109                sizeof corestr.c_fpu.f_fpstatus.f_st);
 110
 111         /* the struct aouthdr of sun coff is not the struct exec stored
 112            in the core file. */
 113         memcpy (&core_aouthdr, &corestr.c_aouthdr, sizeof (struct exec));
 114 #ifndef COFF_ENCAPSULATE
 115         core_aouthdr.magic = corestr.c_aouthdr.a_info;
 116         core_aouthdr.vstamp = /*SUNVERSION*/ 31252;
 117 #endif
 118         printf_unfiltered ("Core file is from \"%s\".\n", corestr.c_cmdname);
 119         if (corestr.c_signo > 0)
 120           printf_unfiltered ("Program terminated with signal %d, %s.\n",
 121                   corestr.c_signo, safe_strsignal (corestr.c_signo));
 122       }
 123       if (filename[0] == '/')
 124         corefile = savestring (filename, strlen (filename));
 125       else
 126         {
 127           corefile = concat (current_directory, "/", filename, NULL);
 128         }
 129
 130       flush_cached_frames ();
 131       select_frame (get_current_frame (), 0);
 132
 133       validate_files ();
 134     }
 135   else if (from_tty)
 136     printf_unfiltered ("No core file now.\n");
 137 }
 138
 139 i387_to_double (from, to)
 140      char *from;
 141      char *to;
 142 {
 143   long *lp;
 144   /* push extended mode on 387 stack, then pop in double mode
 145    *
 146    * first, set exception masks so no error is generated -
 147    * number will be rounded to inf or 0, if necessary
 148    */
 149   asm ("pushl %eax");           /* grab a stack slot */
 150   asm ("fstcw (%esp)");         /* get 387 control word */
 151   asm ("movl (%esp),%eax");     /* save old value */
 152   asm ("orl $0x3f,%eax");               /* mask all exceptions */
 153   asm ("pushl %eax");
 154   asm ("fldcw (%esp)");         /* load new value into 387 */
 155
 156   asm ("movl 8(%ebp),%eax");
 157   asm ("fldt (%eax)");          /* push extended number on 387 stack */
 158   asm ("fwait");
 159   asm ("movl 12(%ebp),%eax");
 160   asm ("fstpl (%eax)");         /* pop double */
 161   asm ("fwait");
 162
 163   asm ("popl %eax");            /* flush modified control word */
 164   asm ("fnclex");                       /* clear exceptions */
 165   asm ("fldcw (%esp)");         /* restore original control word */
 166   asm ("popl %eax");            /* flush saved copy */
 167 }
 168
 169 double_to_i387 (from, to)
 170      char *from;
 171      char *to;
 172 {
 173   /* push double mode on 387 stack, then pop in extended mode
 174    * no errors are possible because every 64-bit pattern
 175    * can be converted to an extended
 176    */
 177   asm ("movl 8(%ebp),%eax");
 178   asm ("fldl (%eax)");
 179   asm ("fwait");
 180   asm ("movl 12(%ebp),%eax");
 181   asm ("fstpt (%eax)");
 182   asm ("fwait");
 183 }
 184
 185 void
 186 fetch_inferior_registers (regno)
 187      int regno;
 188 {
 189   struct regs inferior_registers;
 190   struct fp_state inferior_fp_registers;
 191
 192   registers_fetched ();
 193
 194   ptrace (PTRACE_GETREGS, inferior_pid,
 195           (PTRACE_ARG3_TYPE) &inferior_registers);
 196   ptrace (PTRACE_GETFPREGS, inferior_pid,
 197           (PTRACE_ARG3_TYPE) &inferior_fp_registers);
 198
 199   memcpy (registers, &inferior_registers, sizeof inferior_registers);
 200
 201   memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)],inferior_fp_registers.f_st,
 202          sizeof inferior_fp_registers.f_st);
 203   memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],
 204          &inferior_fp_registers.f_ctrl,
 205          sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
 206 }
 207
 208 /* Store our register values back into the inferior.
 209    If REGNO is -1, do this for all registers.
 210    Otherwise, REGNO specifies which register (so we can save time).  */
 211
 212 void
 213 store_inferior_registers (regno)
 214      int regno;
 215 {
 216   struct regs inferior_registers;
 217   struct fp_state inferior_fp_registers;
 218
 219   memcpy (&inferior_registers, registers, 20 * 4);
 220
 221   memcpy (inferior_fp_registers.f_st,
 222          &registers[REGISTER_BYTE (FP0_REGNUM)],
 223          sizeof inferior_fp_registers.f_st);
 224   memcpy (&inferior_fp_registers.f_ctrl,
 225          &registers[REGISTER_BYTE (FPC_REGNUM)],
 226          sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
 227
 228 #ifdef PTRACE_FP_BUG
 229   if (regno == FP_REGNUM || regno == -1)
 230     /* Storing the frame pointer requires a gross hack, in which an
 231        instruction that moves eax into ebp gets single-stepped.  */
 232     {
 233       int stack = inferior_registers.r_reg[SP_REGNUM];
 234       int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid,
 235                           (PTRACE_ARG3_TYPE) stack);
 236       int reg = inferior_registers.r_reg[EAX];
 237       inferior_registers.r_reg[EAX] =
 238         inferior_registers.r_reg[FP_REGNUM];
 239       ptrace (PTRACE_SETREGS, inferior_pid,
 240               (PTRACE_ARG3_TYPE) &inferior_registers);
 241       ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,
 242               0xc589);
 243       ptrace (PTRACE_SINGLESTEP, inferior_pid, (PTRACE_ARG3_TYPE) stack,
 244               0);
 245       wait (0);
 246       ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack,
 247               stuff);
 248       inferior_registers.r_reg[EAX] = reg;
 249     }
 250 #endif
 251   ptrace (PTRACE_SETREGS, inferior_pid,
 252           (PTRACE_ARG3_TYPE) &inferior_registers);
 253   ptrace (PTRACE_SETFPREGS, inferior_pid,
 254           (PTRACE_ARG3_TYPE) &inferior_fp_registers);
 255 }