Merge GDB 7.5.1

gdb/i386-stub.c

Index: gdb/i386-stub.c
diff --git a/gdb/i386-stub.c b/gdb/i386-stub.c
deleted file mode 100644
index 04996b75cf68073a9bdc3baba92ad96419d567fd..0000000000000000000000000000000000000000
--- a/gdb/i386-stub.c
+++ /dev/null
@@ -1,952 +0,0 @@
-/****************************************************************************
-
-		THIS SOFTWARE IS NOT COPYRIGHTED
-
-   HP offers the following for use in the public domain.  HP makes no
-   warranty with regard to the software or it's performance and the
-   user accepts the software "AS IS" with all faults.
-
-   HP DISCLAIMS ANY WARRANTIES, EXPRESS OR IMPLIED, WITH REGARD
-   TO THIS SOFTWARE INCLUDING BUT NOT LIMITED TO THE WARRANTIES
-   OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
-
-****************************************************************************/
-
-/****************************************************************************
- *  Header: remcom.c,v 1.34 91/03/09 12:29:49 glenne Exp $
- *
- *  Module name: remcom.c $
- *  Revision: 1.34 $
- *  Date: 91/03/09 12:29:49 $
- *  Contributor:     Lake Stevens Instrument Division$
- *
- *  Description:     low level support for gdb debugger. $
- *
- *  Considerations:  only works on target hardware $
- *
- *  Written by:      Glenn Engel $
- *  ModuleState:     Experimental $
- *
- *  NOTES:           See Below $
- *
- *  Modified for 386 by Jim Kingdon, Cygnus Support.
- *
- *  To enable debugger support, two things need to happen.  One, a
- *  call to set_debug_traps() is necessary in order to allow any breakpoints
- *  or error conditions to be properly intercepted and reported to gdb.
- *  Two, a breakpoint needs to be generated to begin communication.  This
- *  is most easily accomplished by a call to breakpoint().  Breakpoint()
- *  simulates a breakpoint by executing a trap #1.
- *
- *  The external function exceptionHandler() is
- *  used to attach a specific handler to a specific 386 vector number.
- *  It should use the same privilege level it runs at.  It should
- *  install it as an interrupt gate so that interrupts are masked
- *  while the handler runs.
- *
- *  Because gdb will sometimes write to the stack area to execute function
- *  calls, this program cannot rely on using the supervisor stack so it
- *  uses it's own stack area reserved in the int array remcomStack.
- *
- *************
- *
- *    The following gdb commands are supported:
- *
- * command          function                               Return value
- *
- *    g             return the value of the CPU registers  hex data or ENN
- *    G             set the value of the CPU registers     OK or ENN
- *
- *    mAA..AA,LLLL  Read LLLL bytes at address AA..AA      hex data or ENN
- *    MAA..AA,LLLL: Write LLLL bytes at address AA.AA      OK or ENN
- *
- *    c             Resume at current address              SNN   ( signal NN)
- *    cAA..AA       Continue at address AA..AA             SNN
- *
- *    s             Step one instruction                   SNN
- *    sAA..AA       Step one instruction from AA..AA       SNN
- *
- *    k             kill
- *
- *    ?             What was the last sigval ?             SNN   (signal NN)
- *
- * All commands and responses are sent with a packet which includes a
- * checksum.  A packet consists of
- *
- * $<packet info>#<checksum>.
- *
- * where
- * <packet info> :: <characters representing the command or response>
- * <checksum>    :: < two hex digits computed as modulo 256 sum of <packetinfo>>
- *
- * When a packet is received, it is first acknowledged with either '+' or '-'.
- * '+' indicates a successful transfer.  '-' indicates a failed transfer.
- *
- * Example:
- *
- * Host:                  Reply:
- * $m0,10#2a               +$00010203040506070809101112131415#42
- *
- ****************************************************************************/
-
-#include <stdio.h>
-#include <string.h>
-
-/************************************************************************
- *
- * external low-level support routines
- */
-
-extern void putDebugChar();	/* write a single character      */
-extern int getDebugChar();	/* read and return a single char */
-extern void exceptionHandler();	/* assign an exception handler   */
-
-/************************************************************************/
-/* BUFMAX defines the maximum number of characters in inbound/outbound buffers*/
-/* at least NUMREGBYTES*2 are needed for register packets */
-#define BUFMAX 400
-
-static char initialized;  /* boolean flag. != 0 means we've been initialized */
-
-int     remote_debug;
-/*  debug >  0 prints ill-formed commands in valid packets & checksum errors */
-
-static const char hexchars[]="0123456789abcdef";
-
-/* Number of registers.  */
-#define NUMREGS	16
-
-/* Number of bytes of registers.  */
-#define NUMREGBYTES (NUMREGS * 4)
-
-enum regnames {EAX, ECX, EDX, EBX, ESP, EBP, ESI, EDI,
-	       PC /* also known as eip */,
-	       PS /* also known as eflags */,
-	       CS, SS, DS, ES, FS, GS};
-
-/*
- * these should not be static cuz they can be used outside this module
- */
-int registers[NUMREGS];
-
-#define STACKSIZE 10000
-int remcomStack[STACKSIZE/sizeof(int)];
-static int* stackPtr = &remcomStack[STACKSIZE/sizeof(int) - 1];
-
-/***************************  ASSEMBLY CODE MACROS *************************/
-/* 									   */
-
-extern void
-return_to_prog ();
-
-/* Restore the program's registers (including the stack pointer, which
-   means we get the right stack and don't have to worry about popping our
-   return address and any stack frames and so on) and return.  */
-asm(".text");
-asm(".globl _return_to_prog");
-asm("_return_to_prog:");
-asm("        movw _registers+44, %ss");
-asm("        movl _registers+16, %esp");
-asm("        movl _registers+4, %ecx");
-asm("        movl _registers+8, %edx");
-asm("        movl _registers+12, %ebx");
-asm("        movl _registers+20, %ebp");
-asm("        movl _registers+24, %esi");
-asm("        movl _registers+28, %edi");
-asm("        movw _registers+48, %ds");
-asm("        movw _registers+52, %es");
-asm("        movw _registers+56, %fs");
-asm("        movw _registers+60, %gs");
-asm("        movl _registers+36, %eax");
-asm("        pushl %eax");  /* saved eflags */
-asm("        movl _registers+40, %eax");
-asm("        pushl %eax");  /* saved cs */
-asm("        movl _registers+32, %eax");
-asm("        pushl %eax");  /* saved eip */
-asm("        movl _registers, %eax");
-/* use iret to restore pc and flags together so
-   that trace flag works right.  */
-asm("        iret");
-
-#define BREAKPOINT() asm("   int $3");
-
-/* Put the error code here just in case the user cares.  */
-int gdb_i386errcode;
-/* Likewise, the vector number here (since GDB only gets the signal
-   number through the usual means, and that's not very specific).  */
-int gdb_i386vector = -1;
-
-/* GDB stores segment registers in 32-bit words (that's just the way
-   m-i386v.h is written).  So zero the appropriate areas in registers.  */
-#define SAVE_REGISTERS1() \
-  asm ("movl %eax, _registers");                                   	  \
-  asm ("movl %ecx, _registers+4");			  		     \
-  asm ("movl %edx, _registers+8");			  		     \
-  asm ("movl %ebx, _registers+12");			  		     \
-  asm ("movl %ebp, _registers+20");			  		     \
-  asm ("movl %esi, _registers+24");			  		     \
-  asm ("movl %edi, _registers+28");			  		     \
-  asm ("movw $0, %ax");							     \
-  asm ("movw %ds, _registers+48");			  		     \
-  asm ("movw %ax, _registers+50");					     \
-  asm ("movw %es, _registers+52");			  		     \
-  asm ("movw %ax, _registers+54");					     \
-  asm ("movw %fs, _registers+56");			  		     \
-  asm ("movw %ax, _registers+58");					     \
-  asm ("movw %gs, _registers+60");			  		     \
-  asm ("movw %ax, _registers+62");
-#define SAVE_ERRCODE() \
-  asm ("popl %ebx");                                  \
-  asm ("movl %ebx, _gdb_i386errcode");
-#define SAVE_REGISTERS2() \
-  asm ("popl %ebx"); /* old eip */			  		     \
-  asm ("movl %ebx, _registers+32");			  		     \
-  asm ("popl %ebx");	 /* old cs */			  		     \
-  asm ("movl %ebx, _registers+40");			  		     \
-  asm ("movw %ax, _registers+42");                                           \
-  asm ("popl %ebx");	 /* old eflags */		  		     \
-  asm ("movl %ebx, _registers+36");			 		     \
-  /* Now that we've done the pops, we can save the stack pointer.");  */   \
-  asm ("movw %ss, _registers+44");					     \
-  asm ("movw %ax, _registers+46");     	       	       	       	       	     \
-  asm ("movl %esp, _registers+16");
-
-/* See if mem_fault_routine is set, if so just IRET to that address.  */
-#define CHECK_FAULT() \
-  asm ("cmpl $0, _mem_fault_routine");					   \
-  asm ("jne mem_fault");
-
-asm (".text");
-asm ("mem_fault:");
-/* OK to clobber temp registers; we're just going to end up in set_mem_err.  */
-/* Pop error code from the stack and save it.  */
-asm ("     popl %eax");
-asm ("     movl %eax, _gdb_i386errcode");
-
-asm ("     popl %eax"); /* eip */
-/* We don't want to return there, we want to return to the function
-   pointed to by mem_fault_routine instead.  */
-asm ("     movl _mem_fault_routine, %eax");
-asm ("     popl %ecx"); /* cs (low 16 bits; junk in hi 16 bits).  */
-asm ("     popl %edx"); /* eflags */
-
-/* Remove this stack frame; when we do the iret, we will be going to
-   the start of a function, so we want the stack to look just like it
-   would after a "call" instruction.  */
-asm ("     leave");
-
-/* Push the stuff that iret wants.  */
-asm ("     pushl %edx"); /* eflags */
-asm ("     pushl %ecx"); /* cs */
-asm ("     pushl %eax"); /* eip */
-
-/* Zero mem_fault_routine.  */
-asm ("     movl $0, %eax");
-asm ("     movl %eax, _mem_fault_routine");
-
-asm ("iret");
-
-#define CALL_HOOK() asm("call _remcomHandler");
-
-/* This function is called when a i386 exception occurs.  It saves
- * all the cpu regs in the _registers array, munges the stack a bit,
- * and invokes an exception handler (remcom_handler).
- *
- * stack on entry:                       stack on exit:
- *   old eflags                          vector number
- *   old cs (zero-filled to 32 bits)
- *   old eip
- *
- */
-extern void _catchException3();
-asm(".text");
-asm(".globl __catchException3");
-asm("__catchException3:");
-SAVE_REGISTERS1();
-SAVE_REGISTERS2();
-asm ("pushl $3");
-CALL_HOOK();
-
-/* Same thing for exception 1.  */
-extern void _catchException1();
-asm(".text");
-asm(".globl __catchException1");
-asm("__catchException1:");
-SAVE_REGISTERS1();
-SAVE_REGISTERS2();
-asm ("pushl $1");
-CALL_HOOK();
-
-/* Same thing for exception 0.  */
-extern void _catchException0();
-asm(".text");
-asm(".globl __catchException0");
-asm("__catchException0:");
-SAVE_REGISTERS1();
-SAVE_REGISTERS2();
-asm ("pushl $0");
-CALL_HOOK();
-
-/* Same thing for exception 4.  */
-extern void _catchException4();
-asm(".text");
-asm(".globl __catchException4");
-asm("__catchException4:");
-SAVE_REGISTERS1();
-SAVE_REGISTERS2();
-asm ("pushl $4");
-CALL_HOOK();
-
-/* Same thing for exception 5.  */
-extern void _catchException5();
-asm(".text");
-asm(".globl __catchException5");
-asm("__catchException5:");
-SAVE_REGISTERS1();
-SAVE_REGISTERS2();
-asm ("pushl $5");
-CALL_HOOK();
-
-/* Same thing for exception 6.  */
-extern void _catchException6();
-asm(".text");
-asm(".globl __catchException6");
-asm("__catchException6:");
-SAVE_REGISTERS1();
-SAVE_REGISTERS2();
-asm ("pushl $6");
-CALL_HOOK();
-
-/* Same thing for exception 7.  */
-extern void _catchException7();
-asm(".text");
-asm(".globl __catchException7");
-asm("__catchException7:");
-SAVE_REGISTERS1();
-SAVE_REGISTERS2();
-asm ("pushl $7");
-CALL_HOOK();
-
-/* Same thing for exception 8.  */
-extern void _catchException8();
-asm(".text");
-asm(".globl __catchException8");
-asm("__catchException8:");
-SAVE_REGISTERS1();
-SAVE_ERRCODE();
-SAVE_REGISTERS2();
-asm ("pushl $8");
-CALL_HOOK();
-
-/* Same thing for exception 9.  */
-extern void _catchException9();
-asm(".text");
-asm(".globl __catchException9");
-asm("__catchException9:");
-SAVE_REGISTERS1();
-SAVE_REGISTERS2();
-asm ("pushl $9");
-CALL_HOOK();
-
-/* Same thing for exception 10.  */
-extern void _catchException10();
-asm(".text");
-asm(".globl __catchException10");
-asm("__catchException10:");
-SAVE_REGISTERS1();
-SAVE_ERRCODE();
-SAVE_REGISTERS2();
-asm ("pushl $10");
-CALL_HOOK();
-
-/* Same thing for exception 12.  */
-extern void _catchException12();
-asm(".text");
-asm(".globl __catchException12");
-asm("__catchException12:");
-SAVE_REGISTERS1();
-SAVE_ERRCODE();
-SAVE_REGISTERS2();
-asm ("pushl $12");
-CALL_HOOK();
-
-/* Same thing for exception 16.  */
-extern void _catchException16();
-asm(".text");
-asm(".globl __catchException16");
-asm("__catchException16:");
-SAVE_REGISTERS1();
-SAVE_REGISTERS2();
-asm ("pushl $16");
-CALL_HOOK();
-
-/* For 13, 11, and 14 we have to deal with the CHECK_FAULT stuff.  */
-
-/* Same thing for exception 13.  */
-extern void _catchException13 ();
-asm (".text");
-asm (".globl __catchException13");
-asm ("__catchException13:");
-CHECK_FAULT();
-SAVE_REGISTERS1();
-SAVE_ERRCODE();
-SAVE_REGISTERS2();
-asm ("pushl $13");
-CALL_HOOK();
-
-/* Same thing for exception 11.  */
-extern void _catchException11 ();
-asm (".text");
-asm (".globl __catchException11");
-asm ("__catchException11:");
-CHECK_FAULT();
-SAVE_REGISTERS1();
-SAVE_ERRCODE();
-SAVE_REGISTERS2();
-asm ("pushl $11");
-CALL_HOOK();
-
-/* Same thing for exception 14.  */
-extern void _catchException14 ();
-asm (".text");
-asm (".globl __catchException14");
-asm ("__catchException14:");
-CHECK_FAULT();
-SAVE_REGISTERS1();
-SAVE_ERRCODE();
-SAVE_REGISTERS2();
-asm ("pushl $14");
-CALL_HOOK();
-
-/*
- * remcomHandler is a front end for handle_exception.  It moves the
- * stack pointer into an area reserved for debugger use.
- */
-asm("_remcomHandler:");
-asm("           popl %eax");        /* pop off return address     */
-asm("           popl %eax");      /* get the exception number   */
-asm("		movl _stackPtr, %esp"); /* move to remcom stack area  */
-asm("		pushl %eax");	/* push exception onto stack  */
-asm("		call  _handle_exception");    /* this never returns */
-
-void
-_returnFromException ()
-{
-  return_to_prog ();
-}
-
-int
-hex (ch)
-     char ch;
-{
-  if ((ch >= 'a') && (ch <= 'f'))
-    return (ch - 'a' + 10);
-  if ((ch >= '0') && (ch <= '9'))
-    return (ch - '0');
-  if ((ch >= 'A') && (ch <= 'F'))
-    return (ch - 'A' + 10);
-  return (-1);
-}
-
-static char remcomInBuffer[BUFMAX];
-static char remcomOutBuffer[BUFMAX];
-
-/* scan for the sequence $<data>#<checksum>     */
-
-unsigned char *
-getpacket (void)
-{
-  unsigned char *buffer = &remcomInBuffer[0];
-  unsigned char checksum;
-  unsigned char xmitcsum;
-  int count;
-  char ch;
-
-  while (1)
-    {
-      /* wait around for the start character, ignore all other characters */
-      while ((ch = getDebugChar ()) != '$')
-	;
-
-    retry:
-      checksum = 0;
-      xmitcsum = -1;
-      count = 0;
-
-      /* now, read until a # or end of buffer is found */
-      while (count < BUFMAX - 1)
-	{
-	  ch = getDebugChar ();
-	  if (ch == '$')
-	    goto retry;
-	  if (ch == '#')
-	    break;
-	  checksum = checksum + ch;
-	  buffer[count] = ch;
-	  count = count + 1;
-	}
-      buffer[count] = 0;
-
-      if (ch == '#')
-	{
-	  ch = getDebugChar ();
-	  xmitcsum = hex (ch) << 4;
-	  ch = getDebugChar ();
-	  xmitcsum += hex (ch);
-
-	  if (checksum != xmitcsum)
-	    {
-	      if (remote_debug)
-		{
-		  fprintf (stderr,
-			   "bad checksum.  My count = 0x%x, sent=0x%x. buf=%s\n",
-			   checksum, xmitcsum, buffer);
-		}
-	      putDebugChar ('-');	/* failed checksum */
-	    }
-	  else
-	    {
-	      putDebugChar ('+');	/* successful transfer */
-
-	      /* if a sequence char is present, reply the sequence ID */
-	      if (buffer[2] == ':')
-		{
-		  putDebugChar (buffer[0]);
-		  putDebugChar (buffer[1]);
-
-		  return &buffer[3];
-		}
-
-	      return &buffer[0];
-	    }
-	}
-    }
-}
-
-/* send the packet in buffer.  */
-
-void
-putpacket (unsigned char *buffer)
-{
-  unsigned char checksum;
-  int count;
-  char ch;
-
-  /*  $<packet info>#<checksum>.  */
-  do
-    {
-      putDebugChar ('$');
-      checksum = 0;
-      count = 0;
-
-      while (ch = buffer[count])
-	{
-	  putDebugChar (ch);
-	  checksum += ch;
-	  count += 1;
-	}
-
-      putDebugChar ('#');
-      putDebugChar (hexchars[checksum >> 4]);
-      putDebugChar (hexchars[checksum % 16]);
-
-    }
-  while (getDebugChar () != '+');
-}
-
-void
-debug_error (format, parm)
-     char *format;
-     char *parm;
-{
-  if (remote_debug)
-    fprintf (stderr, format, parm);
-}
-
-/* Address of a routine to RTE to if we get a memory fault.  */
-static void (*volatile mem_fault_routine) () = NULL;
-
-/* Indicate to caller of mem2hex or hex2mem that there has been an
-   error.  */
-static volatile int mem_err = 0;
-
-void
-set_mem_err (void)
-{
-  mem_err = 1;
-}
-
-/* These are separate functions so that they are so short and sweet
-   that the compiler won't save any registers (if there is a fault
-   to mem_fault, they won't get restored, so there better not be any
-   saved).  */
-int
-get_char (char *addr)
-{
-  return *addr;
-}
-
-void
-set_char (char *addr, int val)
-{
-  *addr = val;
-}
-
-/* convert the memory pointed to by mem into hex, placing result in buf */
-/* return a pointer to the last char put in buf (null) */
-/* If MAY_FAULT is non-zero, then we should set mem_err in response to
-   a fault; if zero treat a fault like any other fault in the stub.  */
-char *
-mem2hex (mem, buf, count, may_fault)
-     char *mem;
-     char *buf;
-     int count;
-     int may_fault;
-{
-  int i;
-  unsigned char ch;
-
-  if (may_fault)
-    mem_fault_routine = set_mem_err;
-  for (i = 0; i < count; i++)
-    {
-      ch = get_char (mem++);
-      if (may_fault && mem_err)
-	return (buf);
-      *buf++ = hexchars[ch >> 4];
-      *buf++ = hexchars[ch % 16];
-    }
-  *buf = 0;
-  if (may_fault)
-    mem_fault_routine = NULL;
-  return (buf);
-}
-
-/* convert the hex array pointed to by buf into binary to be placed in mem */
-/* return a pointer to the character AFTER the last byte written */
-char *
-hex2mem (buf, mem, count, may_fault)
-     char *buf;
-     char *mem;
-     int count;
-     int may_fault;
-{
-  int i;
-  unsigned char ch;
-
-  if (may_fault)
-    mem_fault_routine = set_mem_err;
-  for (i = 0; i < count; i++)
-    {
-      ch = hex (*buf++) << 4;
-      ch = ch + hex (*buf++);
-      set_char (mem++, ch);
-      if (may_fault && mem_err)
-	return (mem);
-    }
-  if (may_fault)
-    mem_fault_routine = NULL;
-  return (mem);
-}
-
-/* this function takes the 386 exception vector and attempts to
-   translate this number into a unix compatible signal value */
-int
-computeSignal (int exceptionVector)
-{
-  int sigval;
-  switch (exceptionVector)
-    {
-    case 0:
-      sigval = 8;
-      break;			/* divide by zero */
-    case 1:
-      sigval = 5;
-      break;			/* debug exception */
-    case 3:
-      sigval = 5;
-      break;			/* breakpoint */
-    case 4:
-      sigval = 16;
-      break;			/* into instruction (overflow) */
-    case 5:
-      sigval = 16;
-      break;			/* bound instruction */
-    case 6:
-      sigval = 4;
-      break;			/* Invalid opcode */
-    case 7:
-      sigval = 8;
-      break;			/* coprocessor not available */
-    case 8:
-      sigval = 7;
-      break;			/* double fault */
-    case 9:
-      sigval = 11;
-      break;			/* coprocessor segment overrun */
-    case 10:
-      sigval = 11;
-      break;			/* Invalid TSS */
-    case 11:
-      sigval = 11;
-      break;			/* Segment not present */
-    case 12:
-      sigval = 11;
-      break;			/* stack exception */
-    case 13:
-      sigval = 11;
-      break;			/* general protection */
-    case 14:
-      sigval = 11;
-      break;			/* page fault */
-    case 16:
-      sigval = 7;
-      break;			/* coprocessor error */
-    default:
-      sigval = 7;		/* "software generated" */
-    }
-  return (sigval);
-}
-
-/**********************************************/
-/* WHILE WE FIND NICE HEX CHARS, BUILD AN INT */
-/* RETURN NUMBER OF CHARS PROCESSED           */
-/**********************************************/
-int
-hexToInt (char **ptr, int *intValue)
-{
-  int numChars = 0;
-  int hexValue;
-
-  *intValue = 0;
-
-  while (**ptr)
-    {
-      hexValue = hex (**ptr);
-      if (hexValue >= 0)
-	{
-	  *intValue = (*intValue << 4) | hexValue;
-	  numChars++;
-	}
-      else
-	break;
-
-      (*ptr)++;
-    }
-
-  return (numChars);
-}
-
-/*
- * This function does all command procesing for interfacing to gdb.
- */
-void
-handle_exception (int exceptionVector)
-{
-  int sigval, stepping;
-  int addr, length;
-  char *ptr;
-  int newPC;
-
-  gdb_i386vector = exceptionVector;
-
-  if (remote_debug)
-    {
-      printf ("vector=%d, sr=0x%x, pc=0x%x\n",
-	      exceptionVector, registers[PS], registers[PC]);
-    }
-
-  /* reply to host that an exception has occurred */
-  sigval = computeSignal (exceptionVector);
-
-  ptr = remcomOutBuffer;
-
-  *ptr++ = 'T';			/* notify gdb with signo, PC, FP and SP */
-  *ptr++ = hexchars[sigval >> 4];
-  *ptr++ = hexchars[sigval & 0xf];
-
-  *ptr++ = hexchars[ESP]; 
-  *ptr++ = ':';
-  ptr = mem2hex((char *)&registers[ESP], ptr, 4, 0);	/* SP */
-  *ptr++ = ';';
-
-  *ptr++ = hexchars[EBP]; 
-  *ptr++ = ':';
-  ptr = mem2hex((char *)&registers[EBP], ptr, 4, 0); 	/* FP */
-  *ptr++ = ';';
-
-  *ptr++ = hexchars[PC]; 
-  *ptr++ = ':';
-  ptr = mem2hex((char *)&registers[PC], ptr, 4, 0); 	/* PC */
-  *ptr++ = ';';
-
-  *ptr = '\0'
-
-  putpacket (remcomOutBuffer);
-
-  stepping = 0;
-
-  while (1 == 1)
-    {
-      remcomOutBuffer[0] = 0;
-      ptr = getpacket ();
-
-      switch (*ptr++)
-	{
-	case '?':
-	  remcomOutBuffer[0] = 'S';
-	  remcomOutBuffer[1] = hexchars[sigval >> 4];
-	  remcomOutBuffer[2] = hexchars[sigval % 16];
-	  remcomOutBuffer[3] = 0;
-	  break;
-	case 'd':
-	  remote_debug = !(remote_debug);	/* toggle debug flag */
-	  break;
-	case 'g':		/* return the value of the CPU registers */
-	  mem2hex ((char *) registers, remcomOutBuffer, NUMREGBYTES, 0);
-	  break;
-	case 'G':		/* set the value of the CPU registers - return OK */
-	  hex2mem (ptr, (char *) registers, NUMREGBYTES, 0);
-	  strcpy (remcomOutBuffer, "OK");
-	  break;
-	case 'P':		/* set the value of a single CPU register - return OK */
-	  {
-	    int regno;
-
-	    if (hexToInt (&ptr, &regno) && *ptr++ == '=')
-	      if (regno >= 0 && regno < NUMREGS)
-		{
-		  hex2mem (ptr, (char *) &registers[regno], 4, 0);
-		  strcpy (remcomOutBuffer, "OK");
-		  break;
-		}
-
-	    strcpy (remcomOutBuffer, "E01");
-	    break;
-	  }
-
-	  /* mAA..AA,LLLL  Read LLLL bytes at address AA..AA */
-	case 'm':
-	  /* TRY TO READ %x,%x.  IF SUCCEED, SET PTR = 0 */
-	  if (hexToInt (&ptr, &addr))
-	    if (*(ptr++) == ',')
-	      if (hexToInt (&ptr, &length))
-		{
-		  ptr = 0;
-		  mem_err = 0;
-		  mem2hex ((char *) addr, remcomOutBuffer, length, 1);
-		  if (mem_err)
-		    {
-		      strcpy (remcomOutBuffer, "E03");
-		      debug_error ("memory fault");
-		    }
-		}
-
-	  if (ptr)
-	    {
-	      strcpy (remcomOutBuffer, "E01");
-	    }
-	  break;
-
-	  /* MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK */
-	case 'M':
-	  /* TRY TO READ '%x,%x:'.  IF SUCCEED, SET PTR = 0 */
-	  if (hexToInt (&ptr, &addr))
-	    if (*(ptr++) == ',')
-	      if (hexToInt (&ptr, &length))
-		if (*(ptr++) == ':')
-		  {
-		    mem_err = 0;
-		    hex2mem (ptr, (char *) addr, length, 1);
-
-		    if (mem_err)
-		      {
-			strcpy (remcomOutBuffer, "E03");
-			debug_error ("memory fault");
-		      }
-		    else
-		      {
-			strcpy (remcomOutBuffer, "OK");
-		      }
-
-		    ptr = 0;
-		  }
-	  if (ptr)
-	    {
-	      strcpy (remcomOutBuffer, "E02");
-	    }
-	  break;
-
-	  /* cAA..AA    Continue at address AA..AA(optional) */
-	  /* sAA..AA   Step one instruction from AA..AA(optional) */
-	case 's':
-	  stepping = 1;
-	case 'c':
-	  /* try to read optional parameter, pc unchanged if no parm */
-	  if (hexToInt (&ptr, &addr))
-	    registers[PC] = addr;
-
-	  newPC = registers[PC];
-
-	  /* clear the trace bit */
-	  registers[PS] &= 0xfffffeff;
-
-	  /* set the trace bit if we're stepping */
-	  if (stepping)
-	    registers[PS] |= 0x100;
-
-	  _returnFromException ();	/* this is a jump */
-	  break;
-
-	  /* kill the program */
-	case 'k':		/* do nothing */
-#if 0
-	  /* Huh? This doesn't look like "nothing".
-	     m68k-stub.c and sparc-stub.c don't have it.  */
-	  BREAKPOINT ();
-#endif
-	  break;
-	}			/* switch */
-
-      /* reply to the request */
-      putpacket (remcomOutBuffer);
-    }
-}
-
-/* this function is used to set up exception handlers for tracing and
-   breakpoints */
-void
-set_debug_traps (void)
-{
-  stackPtr = &remcomStack[STACKSIZE / sizeof (int) - 1];
-
-  exceptionHandler (0, _catchException0);
-  exceptionHandler (1, _catchException1);
-  exceptionHandler (3, _catchException3);
-  exceptionHandler (4, _catchException4);
-  exceptionHandler (5, _catchException5);
-  exceptionHandler (6, _catchException6);
-  exceptionHandler (7, _catchException7);
-  exceptionHandler (8, _catchException8);
-  exceptionHandler (9, _catchException9);
-  exceptionHandler (10, _catchException10);
-  exceptionHandler (11, _catchException11);
-  exceptionHandler (12, _catchException12);
-  exceptionHandler (13, _catchException13);
-  exceptionHandler (14, _catchException14);
-  exceptionHandler (16, _catchException16);
-
-  initialized = 1;
-}
-
-/* This function will generate a breakpoint exception.  It is used at the
-   beginning of a program to sync up with a debugger and can be used
-   otherwise as a quick means to stop program execution and "break" into
-   the debugger.  */
-
-void
-breakpoint (void)
-{
-  if (initialized)
-    BREAKPOINT ();
-}