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, 2002
   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 /* Attaching is not supported.  */
  76 int
  77 myattach (int pid)
  78 {
  79   return -1;
  80 }
  81
  82 /* Kill the inferior process.  Make us have no inferior.  */
  83
  84 void
  85 kill_inferior (void)
  86 {
  87   if (inferior_pid == 0)
  88     return;
  89   ptrace (8, inferior_pid, 0, 0);
  90   wait (0);
  91 /*************inferior_died ();****VK**************/
  92 }
  93
  94 /* Return nonzero if the given thread is still alive.  */
  95 int
  96 mythread_alive (int pid)
  97 {
  98   return 1;
  99 }
 100
 101 /* Wait for process, returns status */
 102
 103 unsigned char
 104 mywait (char *status)
 105 {
 106   int pid;
 107   union wait w;
 108
 109   pid = wait (&w);
 110   if (pid != inferior_pid)
 111     perror_with_name ("wait");
 112
 113   if (WIFEXITED (w))
 114     {
 115       fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
 116       *status = 'W';
 117       return ((unsigned char) WEXITSTATUS (w));
 118     }
 119   else if (!WIFSTOPPED (w))
 120     {
 121       fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
 122       *status = 'X';
 123       return ((unsigned char) WTERMSIG (w));
 124     }
 125
 126   fetch_inferior_registers (0);
 127
 128   *status = 'T';
 129   return ((unsigned char) WSTOPSIG (w));
 130 }
 131
 132 /* Resume execution of the inferior process.
 133    If STEP is nonzero, single-step it.
 134    If SIGNAL is nonzero, give it that signal.  */
 135
 136 void
 137 myresume (int step, int signal)
 138 {
 139   errno = 0;
 140   ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, inferior_pid, 1, signal);
 141   if (errno)
 142     perror_with_name ("ptrace");
 143 }
 144
 145 /* Fetch one or more registers from the inferior.  REGNO == -1 to get
 146    them all.  We actually fetch more than requested, when convenient,
 147    marking them as valid so we won't fetch them again.  */
 148
 149 void
 150 fetch_inferior_registers (int ignored)
 151 {
 152   struct regs inferior_registers;
 153   struct fp_status inferior_fp_registers;
 154
 155   ptrace (PTRACE_GETREGS, inferior_pid,
 156           (PTRACE_ARG3_TYPE) & inferior_registers);
 157 #ifdef FP0_REGNUM
 158   ptrace (PTRACE_GETFPREGS, inferior_pid,
 159           (PTRACE_ARG3_TYPE) & inferior_fp_registers);
 160 #endif
 161
 162   memcpy (registers, &inferior_registers, 16 * 4);
 163 #ifdef FP0_REGNUM
 164   memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers,
 165           sizeof inferior_fp_registers.fps_regs);
 166 #endif
 167   *(int *) &registers[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
 168   *(int *) &registers[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
 169 #ifdef FP0_REGNUM
 170   memcpy
 171     (&registers[REGISTER_BYTE (FPC_REGNUM)],
 172      &inferior_fp_registers.fps_control,
 173      sizeof inferior_fp_registers - sizeof inferior_fp_registers.fps_regs);
 174 #endif
 175 }
 176
 177 /* Store our register values back into the inferior.
 178    If REGNO is -1, do this for all registers.
 179    Otherwise, REGNO specifies which register (so we can save time).  */
 180
 181 void
 182 store_inferior_registers (int ignored)
 183 {
 184   struct regs inferior_registers;
 185   struct fp_status inferior_fp_registers;
 186
 187   memcpy (&inferior_registers, registers, 16 * 4);
 188 #ifdef FP0_REGNUM
 189   memcpy (&inferior_fp_registers,
 190           &registers[REGISTER_BYTE (FP0_REGNUM)],
 191           sizeof inferior_fp_registers.fps_regs);
 192 #endif
 193   inferior_registers.r_ps = *(int *) &registers[REGISTER_BYTE (PS_REGNUM)];
 194   inferior_registers.r_pc = *(int *) &registers[REGISTER_BYTE (PC_REGNUM)];
 195
 196 #ifdef FP0_REGNUM
 197   memcpy (&inferior_fp_registers.fps_control,
 198           &registers[REGISTER_BYTE (FPC_REGNUM)],
 199           (sizeof inferior_fp_registers
 200            - sizeof inferior_fp_registers.fps_regs));
 201 #endif
 202
 203   ptrace (PTRACE_SETREGS, inferior_pid,
 204           (PTRACE_ARG3_TYPE) & inferior_registers);
 205 #if FP0_REGNUM
 206   ptrace (PTRACE_SETFPREGS, inferior_pid,
 207           (PTRACE_ARG3_TYPE) & inferior_fp_registers);
 208 #endif
 209 }
 210
 211 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
 212    in the NEW_SUN_PTRACE case.
 213    It ought to be straightforward.  But it appears that writing did
 214    not write the data that I specified.  I cannot understand where
 215    it got the data that it actually did write.  */
 216
 217 /* Copy LEN bytes from inferior's memory starting at MEMADDR
 218    to debugger memory starting at MYADDR.  */
 219
 220 void
 221 read_inferior_memory (CORE_ADDR memaddr, char *myaddr, int len)
 222 {
 223   register int i;
 224   /* Round starting address down to longword boundary.  */
 225   register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (int);
 226   /* Round ending address up; get number of longwords that makes.  */
 227   register int count
 228   = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
 229   /* Allocate buffer of that many longwords.  */
 230   register int *buffer = (int *) alloca (count * sizeof (int));
 231
 232   /* Read all the longwords */
 233   for (i = 0; i < count; i++, addr += sizeof (int))
 234     {
 235       buffer[i] = ptrace (1, inferior_pid, addr, 0);
 236     }
 237
 238   /* Copy appropriate bytes out of the buffer.  */
 239   memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
 240 }
 241
 242 /* Copy LEN bytes of data from debugger memory at MYADDR
 243    to inferior's memory at MEMADDR.
 244    On failure (cannot write the inferior)
 245    returns the value of errno.  */
 246
 247 int
 248 write_inferior_memory (CORE_ADDR memaddr, char *myaddr, int len)
 249 {
 250   register int i;
 251   /* Round starting address down to longword boundary.  */
 252   register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (int);
 253   /* Round ending address up; get number of longwords that makes.  */
 254   register int count
 255   = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
 256   /* Allocate buffer of that many longwords.  */
 257   register int *buffer = (int *) alloca (count * sizeof (int));
 258   extern int errno;
 259
 260   /* Fill start and end extra bytes of buffer with existing memory data.  */
 261
 262   buffer[0] = ptrace (1, inferior_pid, addr, 0);
 263
 264   if (count > 1)
 265     {
 266       buffer[count - 1]
 267         = ptrace (1, inferior_pid,
 268                   addr + (count - 1) * sizeof (int), 0);
 269     }
 270
 271   /* Copy data to be written over corresponding part of buffer */
 272
 273   memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
 274
 275   /* Write the entire buffer.  */
 276
 277   for (i = 0; i < count; i++, addr += sizeof (int))
 278     {
 279       errno = 0;
 280       ptrace (4, inferior_pid, addr, buffer[i]);
 281       if (errno)
 282         return errno;
 283     }
 284
 285   return 0;
 286 }
 287 \f
 288 void
 289 initialize_low (void)
 290 {
 291 }