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 static char my_registers[REGISTER_BYTES];
  38 char *registers = my_registers;
  39
  40 /* Index within `registers' of the first byte of the space for
  41    register N.  */
  42
  43
  44 char buf2[MAX_REGISTER_RAW_SIZE];
  45 /***************End MY defs*********************/
  46
  47 #include <sys/ptrace.h>
  48 #include <machine/reg.h>
  49
  50 extern int sys_nerr;
  51 extern char **sys_errlist;
  52 extern char **environ;
  53 extern int errno;
  54 extern int inferior_pid;
  55 void quit (), perror_with_name ();
  56 int query ();
  57
  58 /* Start an inferior process and returns its pid.
  59    ALLARGS is a vector of program-name and args.
  60    ENV is the environment vector to pass.  */
  61
  62 int
  63 create_inferior (char *program, 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 (void)
  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 (int pid)
 101 {
 102   return 1;
 103 }
 104
 105 /* Wait for process, returns status */
 106
 107 unsigned char
 108 mywait (char *status)
 109 {
 110   int pid;
 111   union wait w;
 112
 113   pid = wait (&w);
 114   if (pid != inferior_pid)
 115     perror_with_name ("wait");
 116
 117   if (WIFEXITED (w))
 118     {
 119       fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
 120       *status = 'W';
 121       return ((unsigned char) WEXITSTATUS (w));
 122     }
 123   else if (!WIFSTOPPED (w))
 124     {
 125       fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
 126       *status = 'X';
 127       return ((unsigned char) WTERMSIG (w));
 128     }
 129
 130   fetch_inferior_registers (0);
 131
 132   *status = 'T';
 133   return ((unsigned char) WSTOPSIG (w));
 134 }
 135
 136 /* Resume execution of the inferior process.
 137    If STEP is nonzero, single-step it.
 138    If SIGNAL is nonzero, give it that signal.  */
 139
 140 void
 141 myresume (int step, int signal)
 142 {
 143   errno = 0;
 144   ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, inferior_pid, 1, signal);
 145   if (errno)
 146     perror_with_name ("ptrace");
 147 }
 148
 149 /* Fetch one or more registers from the inferior.  REGNO == -1 to get
 150    them all.  We actually fetch more than requested, when convenient,
 151    marking them as valid so we won't fetch them again.  */
 152
 153 void
 154 fetch_inferior_registers (int ignored)
 155 {
 156   struct regs inferior_registers;
 157   struct fp_status inferior_fp_registers;
 158
 159   ptrace (PTRACE_GETREGS, inferior_pid,
 160           (PTRACE_ARG3_TYPE) & inferior_registers);
 161 #ifdef FP0_REGNUM
 162   ptrace (PTRACE_GETFPREGS, inferior_pid,
 163           (PTRACE_ARG3_TYPE) & inferior_fp_registers);
 164 #endif
 165
 166   memcpy (registers, &inferior_registers, 16 * 4);
 167 #ifdef FP0_REGNUM
 168   memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers,
 169           sizeof inferior_fp_registers.fps_regs);
 170 #endif
 171   *(int *) &registers[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
 172   *(int *) &registers[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
 173 #ifdef FP0_REGNUM
 174   memcpy
 175     (&registers[REGISTER_BYTE (FPC_REGNUM)],
 176      &inferior_fp_registers.fps_control,
 177      sizeof inferior_fp_registers - sizeof inferior_fp_registers.fps_regs);
 178 #endif
 179 }
 180
 181 /* Store our register values back into the inferior.
 182    If REGNO is -1, do this for all registers.
 183    Otherwise, REGNO specifies which register (so we can save time).  */
 184
 185 void
 186 store_inferior_registers (int ignored)
 187 {
 188   struct regs inferior_registers;
 189   struct fp_status inferior_fp_registers;
 190
 191   memcpy (&inferior_registers, registers, 16 * 4);
 192 #ifdef FP0_REGNUM
 193   memcpy (&inferior_fp_registers,
 194           &registers[REGISTER_BYTE (FP0_REGNUM)],
 195           sizeof inferior_fp_registers.fps_regs);
 196 #endif
 197   inferior_registers.r_ps = *(int *) &registers[REGISTER_BYTE (PS_REGNUM)];
 198   inferior_registers.r_pc = *(int *) &registers[REGISTER_BYTE (PC_REGNUM)];
 199
 200 #ifdef FP0_REGNUM
 201   memcpy (&inferior_fp_registers.fps_control,
 202           &registers[REGISTER_BYTE (FPC_REGNUM)],
 203           (sizeof inferior_fp_registers
 204            - sizeof inferior_fp_registers.fps_regs));
 205 #endif
 206
 207   ptrace (PTRACE_SETREGS, inferior_pid,
 208           (PTRACE_ARG3_TYPE) & inferior_registers);
 209 #if FP0_REGNUM
 210   ptrace (PTRACE_SETFPREGS, inferior_pid,
 211           (PTRACE_ARG3_TYPE) & inferior_fp_registers);
 212 #endif
 213 }
 214
 215 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
 216    in the NEW_SUN_PTRACE case.
 217    It ought to be straightforward.  But it appears that writing did
 218    not write the data that I specified.  I cannot understand where
 219    it got the data that it actually did write.  */
 220
 221 /* Copy LEN bytes from inferior's memory starting at MEMADDR
 222    to debugger memory starting at MYADDR.  */
 223
 224 read_inferior_memory (CORE_ADDR memaddr, char *myaddr, int len)
 225 {
 226   register int i;
 227   /* Round starting address down to longword boundary.  */
 228   register CORE_ADDR addr = memaddr & -sizeof (int);
 229   /* Round ending address up; get number of longwords that makes.  */
 230   register int count
 231   = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
 232   /* Allocate buffer of that many longwords.  */
 233   register int *buffer = (int *) alloca (count * sizeof (int));
 234
 235   /* Read all the longwords */
 236   for (i = 0; i < count; i++, addr += sizeof (int))
 237     {
 238       buffer[i] = ptrace (1, inferior_pid, addr, 0);
 239     }
 240
 241   /* Copy appropriate bytes out of the buffer.  */
 242   memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
 243 }
 244
 245 /* Copy LEN bytes of data from debugger memory at MYADDR
 246    to inferior's memory at MEMADDR.
 247    On failure (cannot write the inferior)
 248    returns the value of errno.  */
 249
 250 int
 251 write_inferior_memory (CORE_ADDR memaddr, char *myaddr, int len)
 252 {
 253   register int i;
 254   /* Round starting address down to longword boundary.  */
 255   register CORE_ADDR addr = memaddr & -sizeof (int);
 256   /* Round ending address up; get number of longwords that makes.  */
 257   register int count
 258   = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
 259   /* Allocate buffer of that many longwords.  */
 260   register int *buffer = (int *) alloca (count * sizeof (int));
 261   extern int errno;
 262
 263   /* Fill start and end extra bytes of buffer with existing memory data.  */
 264
 265   buffer[0] = ptrace (1, inferior_pid, addr, 0);
 266
 267   if (count > 1)
 268     {
 269       buffer[count - 1]
 270         = ptrace (1, inferior_pid,
 271                   addr + (count - 1) * sizeof (int), 0);
 272     }
 273
 274   /* Copy data to be written over corresponding part of buffer */
 275
 276   memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
 277
 278   /* Write the entire buffer.  */
 279
 280   for (i = 0; i < count; i++, addr += sizeof (int))
 281     {
 282       errno = 0;
 283       ptrace (4, inferior_pid, addr, buffer[i]);
 284       if (errno)
 285         return errno;
 286     }
 287
 288   return 0;
 289 }
 290 \f
 291 void
 292 initialize_low (void)
 293 {
 294 }