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 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 extern int inferior_pid;
  47 void perror_with_name ();
  48
  49 /* Start an inferior process and returns its pid.
  50    ALLARGS is a vector of program-name and args. */
  51
  52 int
  53 create_inferior (char *program, char **allargs)
  54 {
  55   int pid;
  56
  57   pid = fork ();
  58   if (pid < 0)
  59     perror_with_name ("fork");
  60
  61   if (pid == 0)
  62     {
  63       ptrace (PTRACE_TRACEME);
  64
  65       execv (program, allargs);
  66
  67       fprintf (stderr, "Cannot exec %s: %s.\n", program,
  68                errno < sys_nerr ? sys_errlist[errno] : "unknown error");
  69       fflush (stderr);
  70       _exit (0177);
  71     }
  72
  73   return pid;
  74 }
  75
  76 /* Kill the inferior process.  Make us have no inferior.  */
  77
  78 void
  79 kill_inferior (void)
  80 {
  81   if (inferior_pid == 0)
  82     return;
  83   ptrace (8, inferior_pid, 0, 0);
  84   wait (0);
  85 /*************inferior_died ();****VK**************/
  86 }
  87
  88 /* Return nonzero if the given thread is still alive.  */
  89 int
  90 mythread_alive (int pid)
  91 {
  92   return 1;
  93 }
  94
  95 /* Wait for process, returns status */
  96
  97 unsigned char
  98 mywait (char *status)
  99 {
 100   int pid;
 101   union wait w;
 102
 103   pid = wait (&w);
 104   if (pid != inferior_pid)
 105     perror_with_name ("wait");
 106
 107   if (WIFEXITED (w))
 108     {
 109       fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
 110       *status = 'W';
 111       return ((unsigned char) WEXITSTATUS (w));
 112     }
 113   else if (!WIFSTOPPED (w))
 114     {
 115       fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
 116       *status = 'X';
 117       return ((unsigned char) WTERMSIG (w));
 118     }
 119
 120   fetch_inferior_registers (0);
 121
 122   *status = 'T';
 123   return ((unsigned char) WSTOPSIG (w));
 124 }
 125
 126 /* Resume execution of the inferior process.
 127    If STEP is nonzero, single-step it.
 128    If SIGNAL is nonzero, give it that signal.  */
 129
 130 void
 131 myresume (int step, int signal)
 132 {
 133   errno = 0;
 134   ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, inferior_pid, 1, signal);
 135   if (errno)
 136     perror_with_name ("ptrace");
 137 }
 138
 139 /* Fetch one or more registers from the inferior.  REGNO == -1 to get
 140    them all.  We actually fetch more than requested, when convenient,
 141    marking them as valid so we won't fetch them again.  */
 142
 143 void
 144 fetch_inferior_registers (int ignored)
 145 {
 146   struct regs inferior_registers;
 147   struct fp_status inferior_fp_registers;
 148
 149   ptrace (PTRACE_GETREGS, inferior_pid,
 150           (PTRACE_ARG3_TYPE) & inferior_registers);
 151 #ifdef FP0_REGNUM
 152   ptrace (PTRACE_GETFPREGS, inferior_pid,
 153           (PTRACE_ARG3_TYPE) & inferior_fp_registers);
 154 #endif
 155
 156   memcpy (registers, &inferior_registers, 16 * 4);
 157 #ifdef FP0_REGNUM
 158   memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers,
 159           sizeof inferior_fp_registers.fps_regs);
 160 #endif
 161   *(int *) &registers[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
 162   *(int *) &registers[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
 163 #ifdef FP0_REGNUM
 164   memcpy
 165     (&registers[REGISTER_BYTE (FPC_REGNUM)],
 166      &inferior_fp_registers.fps_control,
 167      sizeof inferior_fp_registers - sizeof inferior_fp_registers.fps_regs);
 168 #endif
 169 }
 170
 171 /* Store our register values back into the inferior.
 172    If REGNO is -1, do this for all registers.
 173    Otherwise, REGNO specifies which register (so we can save time).  */
 174
 175 void
 176 store_inferior_registers (int ignored)
 177 {
 178   struct regs inferior_registers;
 179   struct fp_status inferior_fp_registers;
 180
 181   memcpy (&inferior_registers, registers, 16 * 4);
 182 #ifdef FP0_REGNUM
 183   memcpy (&inferior_fp_registers,
 184           &registers[REGISTER_BYTE (FP0_REGNUM)],
 185           sizeof inferior_fp_registers.fps_regs);
 186 #endif
 187   inferior_registers.r_ps = *(int *) &registers[REGISTER_BYTE (PS_REGNUM)];
 188   inferior_registers.r_pc = *(int *) &registers[REGISTER_BYTE (PC_REGNUM)];
 189
 190 #ifdef FP0_REGNUM
 191   memcpy (&inferior_fp_registers.fps_control,
 192           &registers[REGISTER_BYTE (FPC_REGNUM)],
 193           (sizeof inferior_fp_registers
 194            - sizeof inferior_fp_registers.fps_regs));
 195 #endif
 196
 197   ptrace (PTRACE_SETREGS, inferior_pid,
 198           (PTRACE_ARG3_TYPE) & inferior_registers);
 199 #if FP0_REGNUM
 200   ptrace (PTRACE_SETFPREGS, inferior_pid,
 201           (PTRACE_ARG3_TYPE) & inferior_fp_registers);
 202 #endif
 203 }
 204
 205 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
 206    in the NEW_SUN_PTRACE case.
 207    It ought to be straightforward.  But it appears that writing did
 208    not write the data that I specified.  I cannot understand where
 209    it got the data that it actually did write.  */
 210
 211 /* Copy LEN bytes from inferior's memory starting at MEMADDR
 212    to debugger memory starting at MYADDR.  */
 213
 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 & -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 & -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 }