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