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