gdb/gdbserver/low-sun3.c

   1 /* Low level interface to ptrace, for the remote server for GDB.
   2    Copyright 1986, 1987, 1993, 1994, 1995, 1999, 2000, 2001
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "server.h"
  23 #include "<sys/wait.h>"
  24 #include "frame.h"
  25 #include "inferior.h"
  26
  27 #include <stdio.h>
  28 #include <sys/param.h>
  29 #include <sys/dir.h>
  30 #include <sys/user.h>
  31 #include <signal.h>
  32 #include <sys/ioctl.h>
  33 #include <sgtty.h>
  34 #include <fcntl.h>
  35
  36 /***************Begin MY defs*********************/
  37 static char my_registers[REGISTER_BYTES];
  38 char *registers = my_registers;
  39 /***************End MY defs*********************/
  40
  41 #include <sys/ptrace.h>
  42 #include <machine/reg.h>
  43
  44 extern int sys_nerr;
  45 extern char **sys_errlist;
  46 extern int errno;
  47
  48 /* Start an inferior process and returns its pid.
  49    ALLARGS is a vector of program-name and args. */
  50
  51 int
  52 create_inferior (char *program, char **allargs)
  53 {
  54   int pid;
  55
  56   pid = fork ();
  57   if (pid < 0)
  58     perror_with_name ("fork");
  59
  60   if (pid == 0)
  61     {
  62       ptrace (PTRACE_TRACEME);
  63
  64       execv (program, allargs);
  65
  66       fprintf (stderr, "Cannot exec %s: %s.\n", program,
  67                errno < sys_nerr ? sys_errlist[errno] : "unknown error");
  68       fflush (stderr);
  69       _exit (0177);
  70     }
  71
  72   return pid;
  73 }
  74
  75 /* Kill the inferior process.  Make us have no inferior.  */
  76
  77 void
  78 kill_inferior (void)
  79 {
  80   if (inferior_pid == 0)
  81     return;
  82   ptrace (8, inferior_pid, 0, 0);
  83   wait (0);
  84 /*************inferior_died ();****VK**************/
  85 }
  86
  87 /* Return nonzero if the given thread is still alive.  */
  88 int
  89 mythread_alive (int pid)
  90 {
  91   return 1;
  92 }
  93
  94 /* Wait for process, returns status */
  95
  96 unsigned char
  97 mywait (char *status)
  98 {
  99   int pid;
 100   union wait w;
 101
 102   pid = wait (&w);
 103   if (pid != inferior_pid)
 104     perror_with_name ("wait");
 105
 106   if (WIFEXITED (w))
 107     {
 108       fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
 109       *status = 'W';
 110       return ((unsigned char) WEXITSTATUS (w));
 111     }
 112   else if (!WIFSTOPPED (w))
 113     {
 114       fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
 115       *status = 'X';
 116       return ((unsigned char) WTERMSIG (w));
 117     }
 118
 119   fetch_inferior_registers (0);
 120
 121   *status = 'T';
 122   return ((unsigned char) WSTOPSIG (w));
 123 }
 124
 125 /* Resume execution of the inferior process.
 126    If STEP is nonzero, single-step it.
 127    If SIGNAL is nonzero, give it that signal.  */
 128
 129 void
 130 myresume (int step, int signal)
 131 {
 132   errno = 0;
 133   ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, inferior_pid, 1, signal);
 134   if (errno)
 135     perror_with_name ("ptrace");
 136 }
 137
 138 /* Fetch one or more registers from the inferior.  REGNO == -1 to get
 139    them all.  We actually fetch more than requested, when convenient,
 140    marking them as valid so we won't fetch them again.  */
 141
 142 void
 143 fetch_inferior_registers (int ignored)
 144 {
 145   struct regs inferior_registers;
 146   struct fp_status inferior_fp_registers;
 147
 148   ptrace (PTRACE_GETREGS, inferior_pid,
 149           (PTRACE_ARG3_TYPE) & inferior_registers);
 150 #ifdef FP0_REGNUM
 151   ptrace (PTRACE_GETFPREGS, inferior_pid,
 152           (PTRACE_ARG3_TYPE) & inferior_fp_registers);
 153 #endif
 154
 155   memcpy (registers, &inferior_registers, 16 * 4);
 156 #ifdef FP0_REGNUM
 157   memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers,
 158           sizeof inferior_fp_registers.fps_regs);
 159 #endif
 160   *(int *) &registers[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
 161   *(int *) &registers[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
 162 #ifdef FP0_REGNUM
 163   memcpy
 164     (&registers[REGISTER_BYTE (FPC_REGNUM)],
 165      &inferior_fp_registers.fps_control,
 166      sizeof inferior_fp_registers - sizeof inferior_fp_registers.fps_regs);
 167 #endif
 168 }
 169
 170 /* Store our register values back into the inferior.
 171    If REGNO is -1, do this for all registers.
 172    Otherwise, REGNO specifies which register (so we can save time).  */
 173
 174 void
 175 store_inferior_registers (int ignored)
 176 {
 177   struct regs inferior_registers;
 178   struct fp_status inferior_fp_registers;
 179
 180   memcpy (&inferior_registers, registers, 16 * 4);
 181 #ifdef FP0_REGNUM
 182   memcpy (&inferior_fp_registers,
 183           &registers[REGISTER_BYTE (FP0_REGNUM)],
 184           sizeof inferior_fp_registers.fps_regs);
 185 #endif
 186   inferior_registers.r_ps = *(int *) &registers[REGISTER_BYTE (PS_REGNUM)];
 187   inferior_registers.r_pc = *(int *) &registers[REGISTER_BYTE (PC_REGNUM)];
 188
 189 #ifdef FP0_REGNUM
 190   memcpy (&inferior_fp_registers.fps_control,
 191           &registers[REGISTER_BYTE (FPC_REGNUM)],
 192           (sizeof inferior_fp_registers
 193            - sizeof inferior_fp_registers.fps_regs));
 194 #endif
 195
 196   ptrace (PTRACE_SETREGS, inferior_pid,
 197           (PTRACE_ARG3_TYPE) & inferior_registers);
 198 #if FP0_REGNUM
 199   ptrace (PTRACE_SETFPREGS, inferior_pid,
 200           (PTRACE_ARG3_TYPE) & inferior_fp_registers);
 201 #endif
 202 }
 203
 204 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
 205    in the NEW_SUN_PTRACE case.
 206    It ought to be straightforward.  But it appears that writing did
 207    not write the data that I specified.  I cannot understand where
 208    it got the data that it actually did write.  */
 209
 210 /* Copy LEN bytes from inferior's memory starting at MEMADDR
 211    to debugger memory starting at MYADDR.  */
 212
 213 void
 214 read_inferior_memory (CORE_ADDR memaddr, char *myaddr, int len)
 215 {
 216   register int i;
 217   /* Round starting address down to longword boundary.  */
 218   register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (int);
 219   /* Round ending address up; get number of longwords that makes.  */
 220   register int count
 221   = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
 222   /* Allocate buffer of that many longwords.  */
 223   register int *buffer = (int *) alloca (count * sizeof (int));
 224
 225   /* Read all the longwords */
 226   for (i = 0; i < count; i++, addr += sizeof (int))
 227     {
 228       buffer[i] = ptrace (1, inferior_pid, addr, 0);
 229     }
 230
 231   /* Copy appropriate bytes out of the buffer.  */
 232   memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
 233 }
 234
 235 /* Copy LEN bytes of data from debugger memory at MYADDR
 236    to inferior's memory at MEMADDR.
 237    On failure (cannot write the inferior)
 238    returns the value of errno.  */
 239
 240 int
 241 write_inferior_memory (CORE_ADDR memaddr, char *myaddr, int len)
 242 {
 243   register int i;
 244   /* Round starting address down to longword boundary.  */
 245   register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (int);
 246   /* Round ending address up; get number of longwords that makes.  */
 247   register int count
 248   = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
 249   /* Allocate buffer of that many longwords.  */
 250   register int *buffer = (int *) alloca (count * sizeof (int));
 251   extern int errno;
 252
 253   /* Fill start and end extra bytes of buffer with existing memory data.  */
 254
 255   buffer[0] = ptrace (1, inferior_pid, addr, 0);
 256
 257   if (count > 1)
 258     {
 259       buffer[count - 1]
 260         = ptrace (1, inferior_pid,
 261                   addr + (count - 1) * sizeof (int), 0);
 262     }
 263
 264   /* Copy data to be written over corresponding part of buffer */
 265
 266   memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
 267
 268   /* Write the entire buffer.  */
 269
 270   for (i = 0; i < count; i++, addr += sizeof (int))
 271     {
 272       errno = 0;
 273       ptrace (4, inferior_pid, addr, buffer[i]);
 274       if (errno)
 275         return errno;
 276     }
 277
 278   return 0;
 279 }
 280 \f
 281 void
 282 initialize_low (void)
 283 {
 284 }