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