gdb/gdbserver/remote-inflow-sparc.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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #include "defs.h"
  21 #include "/usr/include/sys/wait.h"
  22 #include "frame.h"
  23 #include "inferior.h"
  24 /***************************
  25 #include "initialize.h"
  26 ****************************/
  27
  28 #include <stdio.h>
  29 #include <sys/param.h>
  30 #include <sys/dir.h>
  31 #include <sys/user.h>
  32 #include <signal.h>
  33 #include <sys/ioctl.h>
  34 #include <sgtty.h>
  35 #include <fcntl.h>
  36
  37 /***************Begin MY defs*********************/
  38 int quit_flag = 0;
  39 char registers[REGISTER_BYTES];
  40
  41 /* Index within `registers' of the first byte of the space for
  42    register N.  */
  43
  44
  45 char buf2[MAX_REGISTER_RAW_SIZE];
  46 /***************End MY defs*********************/
  47
  48 #include <sys/ptrace.h>
  49 #include <machine/reg.h>
  50
  51 extern char **environ;
  52 extern int errno;
  53 extern int inferior_pid;
  54 void error (), quit (), perror_with_name ();
  55 int query ();
  56
  57 /* Start an inferior process and returns its pid.
  58    ALLARGS is a vector of program-name and args.
  59    ENV is the environment vector to pass.  */
  60
  61 int
  62 create_inferior (program, allargs)
  63      char *program;
  64      char **allargs;
  65 {
  66   int pid;
  67
  68   pid = fork ();
  69   if (pid < 0)
  70     perror_with_name ("fork");
  71
  72   if (pid == 0)
  73     {
  74       ptrace (PTRACE_TRACEME);
  75
  76       execv (program, allargs);
  77
  78       fprintf (stderr, "Cannot exec %s: %s.\n", program,
  79                errno < sys_nerr ? sys_errlist[errno] : "unknown error");
  80       fflush (stderr);
  81       _exit (0177);
  82     }
  83
  84   return pid;
  85 }
  86
  87 /* Kill the inferior process.  Make us have no inferior.  */
  88
  89 void
  90 kill_inferior ()
  91 {
  92   if (inferior_pid == 0)
  93     return;
  94   ptrace (8, inferior_pid, 0, 0);
  95   wait (0);
  96   /*************inferior_died ();****VK**************/
  97 }
  98
  99 /* Wait for process, returns status */
 100
 101 unsigned char
 102 mywait (status)
 103      char *status;
 104 {
 105   int pid;
 106   union wait w;
 107
 108   pid = wait (&w);
 109   if (pid != inferior_pid)
 110     perror_with_name ("wait");
 111
 112   if (WIFEXITED (w))
 113     {
 114       fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
 115       *status = 'E';
 116       return ((unsigned char) WEXITSTATUS (w));
 117     }
 118   else if (!WIFSTOPPED (w))
 119     {
 120       fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
 121       *status = 'T';
 122       return ((unsigned char) WTERMSIG (w));
 123     }
 124
 125   fetch_inferior_registers (0);
 126
 127   *status = 'S';
 128   return ((unsigned char) WSTOPSIG (w));
 129 }
 130
 131 /* Resume execution of the inferior process.
 132    If STEP is nonzero, single-step it.
 133    If SIGNAL is nonzero, give it that signal.  */
 134
 135 void
 136 myresume (step, signal)
 137      int step;
 138      int signal;
 139 {
 140   errno = 0;
 141   ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, inferior_pid, 1, signal);
 142   if (errno)
 143     perror_with_name ("ptrace");
 144 }
 145
 146 /* Fetch one or more registers from the inferior.  REGNO == -1 to get
 147    them all.  We actually fetch more than requested, when convenient,
 148    marking them as valid so we won't fetch them again.  */
 149
 150 void
 151 fetch_inferior_registers (ignored)
 152      int ignored;
 153 {
 154   struct regs inferior_registers;
 155   struct fp_status inferior_fp_registers;
 156   int i;
 157
 158   /* Global and Out regs are fetched directly, as well as the control
 159      registers.  If we're getting one of the in or local regs,
 160      and the stack pointer has not yet been fetched,
 161      we have to do that first, since they're found in memory relative
 162      to the stack pointer.  */
 163
 164   if (ptrace (PTRACE_GETREGS, inferior_pid,
 165               (PTRACE_ARG3_TYPE) &inferior_registers, 0))
 166     perror("ptrace_getregs");
 167
 168   registers[REGISTER_BYTE (0)] = 0;
 169   memcpy (&registers[REGISTER_BYTE (1)], &inferior_registers.r_g1,
 170           15 * REGISTER_RAW_SIZE (G0_REGNUM));
 171   *(int *)&registers[REGISTER_BYTE (PS_REGNUM)] = inferior_registers.r_ps;
 172   *(int *)&registers[REGISTER_BYTE (PC_REGNUM)] = inferior_registers.r_pc;
 173   *(int *)&registers[REGISTER_BYTE (NPC_REGNUM)] = inferior_registers.r_npc;
 174   *(int *)&registers[REGISTER_BYTE (Y_REGNUM)] = inferior_registers.r_y;
 175
 176   /* Floating point registers */
 177
 178   if (ptrace (PTRACE_GETFPREGS, inferior_pid,
 179               (PTRACE_ARG3_TYPE) &inferior_fp_registers,
 180               0))
 181     perror("ptrace_getfpregs");
 182   memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)], &inferior_fp_registers,
 183           sizeof inferior_fp_registers.fpu_fr);
 184
 185   /* These regs are saved on the stack by the kernel.  Only read them
 186      all (16 ptrace calls!) if we really need them.  */
 187
 188   read_inferior_memory (*(CORE_ADDR*)&registers[REGISTER_BYTE (SP_REGNUM)],
 189                         &registers[REGISTER_BYTE (L0_REGNUM)],
 190                         16*REGISTER_RAW_SIZE (L0_REGNUM));
 191 }
 192
 193 /* Store our register values back into the inferior.
 194    If REGNO is -1, do this for all registers.
 195    Otherwise, REGNO specifies which register (so we can save time).  */
 196
 197 void
 198 store_inferior_registers (ignored)
 199      int ignored;
 200 {
 201   struct regs inferior_registers;
 202   struct fp_status inferior_fp_registers;
 203   CORE_ADDR sp = *(CORE_ADDR *)&registers[REGISTER_BYTE (SP_REGNUM)];
 204
 205   write_inferior_memory (sp, &registers[REGISTER_BYTE (L0_REGNUM)],
 206                          16*REGISTER_RAW_SIZE (L0_REGNUM));
 207
 208   memcpy (&inferior_registers.r_g1, &registers[REGISTER_BYTE (G1_REGNUM)],
 209           15 * REGISTER_RAW_SIZE (G1_REGNUM));
 210
 211   inferior_registers.r_ps =
 212     *(int *)&registers[REGISTER_BYTE (PS_REGNUM)];
 213   inferior_registers.r_pc =
 214     *(int *)&registers[REGISTER_BYTE (PC_REGNUM)];
 215   inferior_registers.r_npc =
 216     *(int *)&registers[REGISTER_BYTE (NPC_REGNUM)];
 217   inferior_registers.r_y =
 218     *(int *)&registers[REGISTER_BYTE (Y_REGNUM)];
 219
 220   if (ptrace (PTRACE_SETREGS, inferior_pid,
 221               (PTRACE_ARG3_TYPE) &inferior_registers, 0))
 222     perror("ptrace_setregs");
 223
 224   memcpy (&inferior_fp_registers, &registers[REGISTER_BYTE (FP0_REGNUM)],
 225           sizeof inferior_fp_registers.fpu_fr);
 226
 227   if (ptrace (PTRACE_SETFPREGS, inferior_pid,
 228               (PTRACE_ARG3_TYPE) &inferior_fp_registers, 0))
 229     perror("ptrace_setfpregs");
 230 }
 231
 232 /* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
 233    in the NEW_SUN_PTRACE case.
 234    It ought to be straightforward.  But it appears that writing did
 235    not write the data that I specified.  I cannot understand where
 236    it got the data that it actually did write.  */
 237
 238 /* Copy LEN bytes from inferior's memory starting at MEMADDR
 239    to debugger memory starting at MYADDR.  */
 240
 241 read_inferior_memory (memaddr, myaddr, len)
 242      CORE_ADDR memaddr;
 243      char *myaddr;
 244      int len;
 245 {
 246   register int i;
 247   /* Round starting address down to longword boundary.  */
 248   register CORE_ADDR addr = memaddr & -sizeof (int);
 249   /* Round ending address up; get number of longwords that makes.  */
 250   register int count
 251   = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
 252   /* Allocate buffer of that many longwords.  */
 253   register int *buffer = (int *) alloca (count * sizeof (int));
 254
 255   /* Read all the longwords */
 256   for (i = 0; i < count; i++, addr += sizeof (int))
 257     {
 258       buffer[i] = ptrace (1, inferior_pid, addr, 0);
 259     }
 260
 261   /* Copy appropriate bytes out of the buffer.  */
 262   bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
 263 }
 264
 265 /* Copy LEN bytes of data from debugger memory at MYADDR
 266    to inferior's memory at MEMADDR.
 267    On failure (cannot write the inferior)
 268    returns the value of errno.  */
 269
 270 int
 271 write_inferior_memory (memaddr, myaddr, len)
 272      CORE_ADDR memaddr;
 273      char *myaddr;
 274      int len;
 275 {
 276   register int i;
 277   /* Round starting address down to longword boundary.  */
 278   register CORE_ADDR addr = memaddr & -sizeof (int);
 279   /* Round ending address up; get number of longwords that makes.  */
 280   register int count
 281   = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
 282   /* Allocate buffer of that many longwords.  */
 283   register int *buffer = (int *) alloca (count * sizeof (int));
 284   extern int errno;
 285
 286   /* Fill start and end extra bytes of buffer with existing memory data.  */
 287
 288   buffer[0] = ptrace (1, inferior_pid, addr, 0);
 289
 290   if (count > 1)
 291     {
 292       buffer[count - 1]
 293         = ptrace (1, inferior_pid,
 294                   addr + (count - 1) * sizeof (int), 0);
 295     }
 296
 297   /* Copy data to be written over corresponding part of buffer */
 298
 299   bcopy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
 300
 301   /* Write the entire buffer.  */
 302
 303   for (i = 0; i < count; i++, addr += sizeof (int))
 304     {
 305       errno = 0;
 306       ptrace (4, inferior_pid, addr, buffer[i]);
 307       if (errno)
 308         return errno;
 309     }
 310
 311   return 0;
 312 }
 313 \f
 314 void
 315 initialize ()
 316 {
 317   inferior_pid = 0;
 318 }
 319
 320 int
 321 have_inferior_p ()
 322 {
 323   return inferior_pid != 0;
 324 }