gdb/gdbserver/low-sun3.c

   1 /* Low level interface to ptrace, for the remote server for GDB.
   2    Copyright (C) 1986, 1987, 1993 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., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #include "defs.h"
  22 #include "<sys/wait.h>"
  23 #include "frame.h"
  24 #include "inferior.h"
  25
  26 #include <stdio.h>
  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 <sgtty.h>
  33 #include <fcntl.h>
  34
  35 /***************Begin MY defs*********************/
  36 int quit_flag = 0;
  37 char registers[REGISTER_BYTES];
  38
  39 /* Index within `registers' of the first byte of the space for
  40    register N.  */
  41
  42
  43 char buf2[MAX_REGISTER_RAW_SIZE];
  44 /***************End MY defs*********************/
  45
  46 #include <sys/ptrace.h>
  47 #include <machine/reg.h>
  48
  49 extern int sys_nerr;
  50 extern char **sys_errlist;
  51 extern char **environ;
  52 extern int errno;
  53 extern int inferior_pid;
  54 void quit (), perror_with_name ();
  55 int query ();
  56
  57 /* Start an inferior process and returns its pid.
  58    ALLARGS is a vector of program-name and args.
  59    ENV is the environment vector to pass.  */
  60
  61 int
  62 create_inferior (program, allargs)
  63      char *program;
  64      char **allargs;
  65 {
  66   int pid;
  67
  68   pid = fork ();
  69   if (pid < 0)
  70     perror_with_name ("fork");
  71
  72   if (pid == 0)
  73     {
  74       ptrace (PTRACE_TRACEME);
  75
  76       execv (program, allargs);
  77
  78       fprintf (stderr, "Cannot exec %s: %s.\n", program,
  79                errno < sys_nerr ? sys_errlist[errno] : "unknown error");
  80       fflush (stderr);
  81       _exit (0177);
  82     }
  83
  84   return pid;
  85 }
  86
  87 /* Kill the inferior process.  Make us have no inferior.  */
  88
  89 void
  90 kill_inferior ()
  91 {
  92   if (inferior_pid == 0)
  93     return;
  94   ptrace (8, inferior_pid, 0, 0);
  95   wait (0);
  96 /*************inferior_died ();****VK**************/
  97 }
  98
  99 /* Return nonzero if the given thread is still alive.  */
 100 int
 101 mythread_alive (pid)
 102      int pid;
 103 {
 104   return 1;
 105 }
 106
 107 /* Wait for process, returns status */
 108
 109 unsigned char
 110 mywait (status)
 111      char *status;
 112 {
 113   int pid;
 114   union wait w;
 115
 116   pid = wait (&w);
 117   if (pid != inferior_pid)
 118     perror_with_name ("wait");
 119
 120   if (WIFEXITED (w))
 121     {
 122       fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
 123       *status = 'W';
 124       return ((unsigned char) WEXITSTATUS (w));
 125     }
 126   else if (!WIFSTOPPED (w))
 127     {
 128       fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
 129       *status = 'X';
 130       return ((unsigned char) WTERMSIG (w));
 131     }
 132
 133   fetch_inferior_registers (0);
 134
 135   *status = 'T';
 136   return ((unsigned char) WSTOPSIG (w));
 137 }
 138
 139 /* Resume execution of the inferior process.
 140    If STEP is nonzero, single-step it.
 141    If SIGNAL is nonzero, give it that signal.  */
 142
 143 void
 144 myresume (step, signal)
 145      int step;
 146      int signal;
 147 {
 148   errno = 0;
 149   ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, inferior_pid, 1, signal);
 150   if (errno)
 151     perror_with_name ("ptrace");
 152 }
 153
 154 /* Fetch one or more registers from the inferior.  REGNO == -1 to get
 155    them all.  We actually fetch more than requested, when convenient,
 156    marking them as valid so we won't fetch them again.  */
 157
 158 void
 159 fetch_inferior_registers (ignored)
 160      int ignored;
 161 {
 162   struct regs inferior_registers;
 163   struct fp_status inferior_fp_registers;
 164
 165   ptrace (PTRACE_GETREGS, inferior_pid,
 166           (PTRACE_ARG3_TYPE) & inferior_registers);
 167 #ifdef FP0_REGNUM
 168   ptrace (PTRACE_GETFPREGS, inferior_pid,
 169           (PTRACE_ARG3_TYPE) & inferior_fp_registers);
 170 #endif
 171
 172   memcpy (registers, &inferior_registers, 16 * 4);
 173 #ifdef FP0_REGNUM
 174   memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers,
 175           sizeof inferior_fp_registers.fps_regs);
 176 #endif
 177   *(int *) &registers[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
 178   *(int *) &registers[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
 179 #ifdef FP0_REGNUM
 180   memcpy
 181     (&registers[REGISTER_BYTE (FPC_REGNUM)],
 182      &inferior_fp_registers.fps_control,
 183      sizeof inferior_fp_registers - sizeof inferior_fp_registers.fps_regs);
 184 #endif
 185 }
 186
 187 /* Store our register values back into the inferior.
 188    If REGNO is -1, do this for all registers.
 189    Otherwise, REGNO specifies which register (so we can save time).  */
 190
 191 void
 192 store_inferior_registers (ignored)
 193      int ignored;
 194 {
 195   struct regs inferior_registers;
 196   struct fp_status inferior_fp_registers;
 197
 198   memcpy (&inferior_registers, registers, 16 * 4);
 199 #ifdef FP0_REGNUM
 200   memcpy (&inferior_fp_registers,
 201           &registers[REGISTER_BYTE (FP0_REGNUM)],
 202           sizeof inferior_fp_registers.fps_regs);
 203 #endif
 204   inferior_registers.r_ps = *(int *) &registers[REGISTER_BYTE (PS_REGNUM)];
 205   inferior_registers.r_pc = *(int *) &registers[REGISTER_BYTE (PC_REGNUM)];
 206
 207 #ifdef FP0_REGNUM
 208   memcpy (&inferior_fp_registers.fps_control,
 209           &registers[REGISTER_BYTE (FPC_REGNUM)],
 210           (sizeof inferior_fp_registers
 211            - sizeof inferior_fp_registers.fps_regs));
 212 #endif
 213
 214   ptrace (PTRACE_SETREGS, inferior_pid,
 215           (PTRACE_ARG3_TYPE) & inferior_registers);
 216 #if FP0_REGNUM
 217   ptrace (PTRACE_SETFPREGS, inferior_pid,
 218           (PTRACE_ARG3_TYPE) & inferior_fp_registers);
 219 #endif
 220 }
 221
 222 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
 223    in the NEW_SUN_PTRACE case.
 224    It ought to be straightforward.  But it appears that writing did
 225    not write the data that I specified.  I cannot understand where
 226    it got the data that it actually did write.  */
 227
 228 /* Copy LEN bytes from inferior's memory starting at MEMADDR
 229    to debugger memory starting at MYADDR.  */
 230
 231 read_inferior_memory (memaddr, myaddr, len)
 232      CORE_ADDR memaddr;
 233      char *myaddr;
 234      int len;
 235 {
 236   register int i;
 237   /* Round starting address down to longword boundary.  */
 238   register CORE_ADDR addr = memaddr & -sizeof (int);
 239   /* Round ending address up; get number of longwords that makes.  */
 240   register int count
 241   = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
 242   /* Allocate buffer of that many longwords.  */
 243   register int *buffer = (int *) alloca (count * sizeof (int));
 244
 245   /* Read all the longwords */
 246   for (i = 0; i < count; i++, addr += sizeof (int))
 247     {
 248       buffer[i] = ptrace (1, inferior_pid, addr, 0);
 249     }
 250
 251   /* Copy appropriate bytes out of the buffer.  */
 252   memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
 253 }
 254
 255 /* Copy LEN bytes of data from debugger memory at MYADDR
 256    to inferior's memory at MEMADDR.
 257    On failure (cannot write the inferior)
 258    returns the value of errno.  */
 259
 260 int
 261 write_inferior_memory (memaddr, myaddr, len)
 262      CORE_ADDR memaddr;
 263      char *myaddr;
 264      int len;
 265 {
 266   register int i;
 267   /* Round starting address down to longword boundary.  */
 268   register CORE_ADDR addr = memaddr & -sizeof (int);
 269   /* Round ending address up; get number of longwords that makes.  */
 270   register int count
 271   = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
 272   /* Allocate buffer of that many longwords.  */
 273   register int *buffer = (int *) alloca (count * sizeof (int));
 274   extern int errno;
 275
 276   /* Fill start and end extra bytes of buffer with existing memory data.  */
 277
 278   buffer[0] = ptrace (1, inferior_pid, addr, 0);
 279
 280   if (count > 1)
 281     {
 282       buffer[count - 1]
 283         = ptrace (1, inferior_pid,
 284                   addr + (count - 1) * sizeof (int), 0);
 285     }
 286
 287   /* Copy data to be written over corresponding part of buffer */
 288
 289   memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
 290
 291   /* Write the entire buffer.  */
 292
 293   for (i = 0; i < count; i++, addr += sizeof (int))
 294     {
 295       errno = 0;
 296       ptrace (4, inferior_pid, addr, buffer[i]);
 297       if (errno)
 298         return errno;
 299     }
 300
 301   return 0;
 302 }
 303 \f
 304 void
 305 initialize ()
 306 {
 307   inferior_pid = 0;
 308 }
 309
 310 int
 311 have_inferior_p ()
 312 {
 313   return inferior_pid != 0;
 314 }