Initial creation of sourceware repository

1 files changed, 0 insertions, 1024 deletions

diff --git a/gdb/sparcl-stub.c b/gdb/sparcl-stub.c
deleted file mode 100644
index c7994fe..0000000
--- a/gdb/sparcl-stub.c
+++ /dev/null
@@ -1,1024 +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 SPARC by Stu Grossman, Cygnus Support.
- *  Based on sparc-stub.c, it's modified for SPARClite Debug Unit hardware
- *  breakpoint support to create sparclite-stub.c, by Kung Hsu, Cygnus Support.
- *
- *  This code has been extensively tested on the Fujitsu SPARClite demo board.
- *
- *  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 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)
- *
- *    bBB..BB	    Set baud rate to BB..BB		   OK or BNN, then sets
- *							   baud rate
- *
- * 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 <string.h>
-#include <signal.h>
-#include <sparclite.h>
-
-/************************************************************************
- *
- * external low-level support routines
- */
-
-extern void putDebugChar (int c); /* write a single character      */
-extern int getDebugChar (void);	/* read and return a single char */
-
-/************************************************************************/
-/* BUFMAX defines the maximum number of characters in inbound/outbound buffers*/
-/* at least NUMREGBYTES*2 are needed for register packets */
-#define BUFMAX 2048
-
-static int initialized = 0;	/* !0 means we've been initialized */
-
-extern void breakinst ();
-static void set_mem_fault_trap (int enable);
-static void get_in_break_mode (void);
-
-static const char hexchars[]="0123456789abcdef";
-
-#define NUMREGS 80 
-
-/* Number of bytes of registers.  */
-#define NUMREGBYTES (NUMREGS * 4)
-enum regnames {G0, G1, G2, G3, G4, G5, G6, G7,
-		 O0, O1, O2, O3, O4, O5, SP, O7,
-		 L0, L1, L2, L3, L4, L5, L6, L7,
-		 I0, I1, I2, I3, I4, I5, FP, I7,
-
-		 F0, F1, F2, F3, F4, F5, F6, F7,
-		 F8, F9, F10, F11, F12, F13, F14, F15,
-		 F16, F17, F18, F19, F20, F21, F22, F23,
-		 F24, F25, F26, F27, F28, F29, F30, F31,
-		 Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR,
-		 DIA1, DIA2, DDA1, DDA2, DDV1, DDV2, DCR, DSR };
-
-/***************************  ASSEMBLY CODE MACROS *************************/
-/* 									   */
-
-extern void trap_low();
-
-/* Create private copies of common functions used by the stub.  This prevents
-   nasty interactions between app code and the stub (for instance if user steps
-   into strlen, etc..) */
-
-static int
-strlen (const char *s)
-{
-  const char *s1 = s;
-
-  while (*s1++ != '\000');
-
-  return s1 - s;
-}
-
-static char *
-strcpy (char *dst, const char *src)
-{
-  char *retval = dst;
-
-  while ((*dst++ = *src++) != '\000');
-
-  return retval;
-}
-
-static void *
-memcpy (void *vdst, const void *vsrc, int n)
-{
-  char *dst = vdst;
-  const char *src = vsrc;
-  char *retval = dst;
-
-  while (n-- > 0)
-    *dst++ = *src++;
-
-  return retval;
-}
-
-asm("
-	.reserve trapstack, 1000 * 4, \"bss\", 8
-
-	.data
-	.align	4
-
-in_trap_handler:
-	.word	0
-
-	.text
-	.align 4
-
-! This function is called when any SPARC trap (except window overflow or
-! underflow) occurs.  It makes sure that the invalid register window is still
-! available before jumping into C code.  It will also restore the world if you
-! return from handle_exception.
-!
-! On entry, trap_low expects l1 and l2 to contain pc and npc respectivly.
-! Register usage throughout the routine is as follows:
-!
-!	l0 - psr
-!	l1 - pc
-!	l2 - npc
-!	l3 - wim
-!	l4 - scratch and y reg
-!	l5 - scratch and tbr
-!	l6 - unused
-!	l7 - unused
-
-	.globl _trap_low
-_trap_low:
-	mov	%psr, %l0
-	mov	%wim, %l3
-
-	srl	%l3, %l0, %l4		! wim >> cwp
-	cmp	%l4, 1
-	bne	window_fine		! Branch if not in the invalid window
-	nop
-
-! Handle window overflow
-
-	mov	%g1, %l4		! Save g1, we use it to hold the wim
-	srl	%l3, 1, %g1		! Rotate wim right
-	tst	%g1
-	bg	good_wim		! Branch if new wim is non-zero
-	nop
-
-! At this point, we need to bring a 1 into the high order bit of the wim.
-! Since we don't want to make any assumptions about the number of register
-! windows, we figure it out dynamically so as to setup the wim correctly.
-
-	not	%g1			! Fill g1 with ones
-	mov	%g1, %wim		! Fill the wim with ones
-	nop
-	nop
-	nop
-	mov	%wim, %g1		! Read back the wim
-	inc	%g1			! Now g1 has 1 just to left of wim
-	srl	%g1, 1, %g1		! Now put 1 at top of wim
-	mov	%g0, %wim		! Clear wim so that subsequent save
-	nop				!  won't trap
-	nop
-	nop
-
-good_wim:
-	save	%g0, %g0, %g0		! Slip into next window
-	mov	%g1, %wim		! Install the new wim
-
-	std	%l0, [%sp + 0 * 4]	! save L & I registers
-	std	%l2, [%sp + 2 * 4]
-	std	%l4, [%sp + 4 * 4]
-	std	%l6, [%sp + 6 * 4]
-
-	std	%i0, [%sp + 8 * 4]
-	std	%i2, [%sp + 10 * 4]
-	std	%i4, [%sp + 12 * 4]
-	std	%i6, [%sp + 14 * 4]
-
-	restore				! Go back to trap window.
-	mov	%l4, %g1		! Restore %g1
-
-window_fine:
-	sethi	%hi(in_trap_handler), %l4
-	ld	[%lo(in_trap_handler) + %l4], %l5
-	tst	%l5
-	bg	recursive_trap
-	inc	%l5
-
-	set	trapstack+1000*4, %sp	! Switch to trap stack
-
-recursive_trap:
-	st	%l5, [%lo(in_trap_handler) + %l4]
-	sub	%sp,(16+1+6+1+80)*4,%sp	! Make room for input & locals
- 					! + hidden arg + arg spill
-					! + doubleword alignment
-					! + registers[72] local var
-
-	std	%g0, [%sp + (24 + 0) * 4] ! registers[Gx]
-	std	%g2, [%sp + (24 + 2) * 4]
-	std	%g4, [%sp + (24 + 4) * 4]
-	std	%g6, [%sp + (24 + 6) * 4]
-
-	std	%i0, [%sp + (24 + 8) * 4] ! registers[Ox]
-	std	%i2, [%sp + (24 + 10) * 4]
-	std	%i4, [%sp + (24 + 12) * 4]
-	std	%i6, [%sp + (24 + 14) * 4]
-
-	mov	%y, %l4
-	mov	%tbr, %l5
-	st	%l4, [%sp + (24 + 64) * 4] ! Y
-	st	%l0, [%sp + (24 + 65) * 4] ! PSR
-	st	%l3, [%sp + (24 + 66) * 4] ! WIM
-	st	%l5, [%sp + (24 + 67) * 4] ! TBR
-	st	%l1, [%sp + (24 + 68) * 4] ! PC
-	st	%l2, [%sp + (24 + 69) * 4] ! NPC
-
-	or	%l0, 0xf20, %l4
-	mov	%l4, %psr		! Turn on traps, disable interrupts
-
-	set	0x1000, %l1
-	btst	%l1, %l0		! FP enabled?
-	be	no_fpstore
-	nop
-
-! Must save fsr first, to flush the FQ.  This may cause a deferred fp trap, so
-! traps must be enabled to allow the trap handler to clean things up.
-
-	st	%fsr, [%sp + (24 + 70) * 4]
-
-	std	%f0, [%sp + (24 + 32) * 4]
-	std	%f2, [%sp + (24 + 34) * 4]
-	std	%f4, [%sp + (24 + 36) * 4]
-	std	%f6, [%sp + (24 + 38) * 4]
-	std	%f8, [%sp + (24 + 40) * 4]
-	std	%f10, [%sp + (24 + 42) * 4]
-	std	%f12, [%sp + (24 + 44) * 4]
-	std	%f14, [%sp + (24 + 46) * 4]
-	std	%f16, [%sp + (24 + 48) * 4]
-	std	%f18, [%sp + (24 + 50) * 4]
-	std	%f20, [%sp + (24 + 52) * 4]
-	std	%f22, [%sp + (24 + 54) * 4]
-	std	%f24, [%sp + (24 + 56) * 4]
-	std	%f26, [%sp + (24 + 58) * 4]
-	std	%f28, [%sp + (24 + 60) * 4]
-	std	%f30, [%sp + (24 + 62) * 4]
-no_fpstore:
-
-	call	_handle_exception
-	add	%sp, 24 * 4, %o0	! Pass address of registers
-
-! Reload all of the registers that aren't on the stack
-
-	ld	[%sp + (24 + 1) * 4], %g1 ! registers[Gx]
-	ldd	[%sp + (24 + 2) * 4], %g2
-	ldd	[%sp + (24 + 4) * 4], %g4
-	ldd	[%sp + (24 + 6) * 4], %g6
-
-	ldd	[%sp + (24 + 8) * 4], %i0 ! registers[Ox]
-	ldd	[%sp + (24 + 10) * 4], %i2
-	ldd	[%sp + (24 + 12) * 4], %i4
-	ldd	[%sp + (24 + 14) * 4], %i6
-
-
-	ldd	[%sp + (24 + 64) * 4], %l0 ! Y & PSR
-	ldd	[%sp + (24 + 68) * 4], %l2 ! PC & NPC
-
-	set	0x1000, %l5
-	btst	%l5, %l1		! FP enabled?
-	be	no_fpreload
-	nop
-
-	ldd	[%sp + (24 + 32) * 4], %f0
-	ldd	[%sp + (24 + 34) * 4], %f2
-	ldd	[%sp + (24 + 36) * 4], %f4
-	ldd	[%sp + (24 + 38) * 4], %f6
-	ldd	[%sp + (24 + 40) * 4], %f8
-	ldd	[%sp + (24 + 42) * 4], %f10
-	ldd	[%sp + (24 + 44) * 4], %f12
-	ldd	[%sp + (24 + 46) * 4], %f14
-	ldd	[%sp + (24 + 48) * 4], %f16
-	ldd	[%sp + (24 + 50) * 4], %f18
-	ldd	[%sp + (24 + 52) * 4], %f20
-	ldd	[%sp + (24 + 54) * 4], %f22
-	ldd	[%sp + (24 + 56) * 4], %f24
-	ldd	[%sp + (24 + 58) * 4], %f26
-	ldd	[%sp + (24 + 60) * 4], %f28
-	ldd	[%sp + (24 + 62) * 4], %f30
-
-	ld	[%sp + (24 + 70) * 4], %fsr
-no_fpreload:
-
-	restore				! Ensure that previous window is valid
-	save	%g0, %g0, %g0		!  by causing a window_underflow trap
-
-	mov	%l0, %y
-	mov	%l1, %psr		! Make sure that traps are disabled
-					! for rett
-	sethi	%hi(in_trap_handler), %l4
-	ld	[%lo(in_trap_handler) + %l4], %l5
-	dec	%l5
-	st	%l5, [%lo(in_trap_handler) + %l4]
-
-	jmpl	%l2, %g0		! Restore old PC
-	rett	%l3			! Restore old nPC
-");
-
-/* Convert ch from a hex digit to an int */
-
-static int
-hex(ch)
-     unsigned 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;
-}
-
-/* scan for the sequence $<data>#<checksum>     */
-
-static void
-getpacket(buffer)
-     char *buffer;
-{
-  unsigned char checksum;
-  unsigned char xmitcsum;
-  int i;
-  int count;
-  unsigned char ch;
-
-  do
-    {
-      /* wait around for the start character, ignore all other characters */
-      while ((ch = (getDebugChar() & 0x7f)) != '$') ;
-
-      checksum = 0;
-      xmitcsum = -1;
-
-      count = 0;
-
-      /* now, read until a # or end of buffer is found */
-      while (count < BUFMAX)
-	{
-	  ch = getDebugChar() & 0x7f;
-	  if (ch == '#')
-	    break;
-	  checksum = checksum + ch;
-	  buffer[count] = ch;
-	  count = count + 1;
-	}
-
-      if (count >= BUFMAX)
-	continue;
-
-      buffer[count] = 0;
-
-      if (ch == '#')
-	{
-	  xmitcsum = hex(getDebugChar() & 0x7f) << 4;
-	  xmitcsum |= hex(getDebugChar() & 0x7f);
-#if 0
-	  /* Humans shouldn't have to figure out checksums to type to it. */
-	  putDebugChar ('+');
-	  return;
-#endif
-	  if (checksum != xmitcsum)
-	    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]);
-		  /* remove sequence chars from buffer */
-		  count = strlen(buffer);
-		  for (i=3; i <= count; i++)
-		    buffer[i-3] = buffer[i];
-		}
-	    }
-	}
-    }
-  while (checksum != xmitcsum);
-}
-
-/* send the packet in buffer.  */
-
-static void
-putpacket(buffer)
-     unsigned char *buffer;
-{
-  unsigned char checksum;
-  int count;
-  unsigned 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 & 0xf]);
-
-    }
-  while ((getDebugChar() & 0x7f) != '+');
-}
-
-static char remcomInBuffer[BUFMAX];
-static char remcomOutBuffer[BUFMAX];
-
-/* Indicate to caller of mem2hex or hex2mem that there has been an
-   error.  */
-static volatile int mem_err = 0;
-
-/* Convert the memory pointed to by mem into hex, placing result in buf.
- * Return a pointer to the last char put in buf (null), in case of mem fault,
- * return 0.
- * If MAY_FAULT is non-zero, then we will handle memory faults by returning
- * a 0, else treat a fault like any other fault in the stub.
- */
-
-static unsigned char *
-mem2hex(mem, buf, count, may_fault)
-     unsigned char *mem;
-     unsigned char *buf;
-     int count;
-     int may_fault;
-{
-  unsigned char ch;
-
-  set_mem_fault_trap(may_fault);
-
-  while (count-- > 0)
-    {
-      ch = *mem++;
-      if (mem_err)
-	return 0;
-      *buf++ = hexchars[ch >> 4];
-      *buf++ = hexchars[ch & 0xf];
-    }
-
-  *buf = 0;
-
-  set_mem_fault_trap(0);
-
-  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 */
-
-static char *
-hex2mem(buf, mem, count, may_fault)
-     unsigned char *buf;
-     unsigned char *mem;
-     int count;
-     int may_fault;
-{
-  int i;
-  unsigned char ch;
-
-  set_mem_fault_trap(may_fault);
-
-  for (i=0; i<count; i++)
-    {
-      ch = hex(*buf++) << 4;
-      ch |= hex(*buf++);
-      *mem++ = ch;
-      if (mem_err)
-	return 0;
-    }
-
-  set_mem_fault_trap(0);
-
-  return mem;
-}
-
-/* This table contains the mapping between SPARC hardware trap types, and
-   signals, which are primarily what GDB understands.  It also indicates
-   which hardware traps we need to commandeer when initializing the stub. */
-
-static struct hard_trap_info
-{
-  unsigned char tt;		/* Trap type code for SPARClite */
-  unsigned char signo;		/* Signal that we map this trap into */
-} hard_trap_info[] = {
-  {0x01, SIGSEGV},		/* instruction access error */
-  {0x02, SIGILL},		/* privileged instruction */
-  {0x03, SIGILL},		/* illegal instruction */
-  {0x04, SIGEMT},		/* fp disabled */
-  {0x07, SIGBUS},		/* mem address not aligned */
-  {0x09, SIGSEGV},		/* data access exception */
-  {0x0a, SIGEMT},		/* tag overflow */
-  {0x20, SIGBUS},		/* r register access error */
-  {0x21, SIGBUS},		/* instruction access error */
-  {0x24, SIGEMT},		/* cp disabled */
-  {0x29, SIGBUS},		/* data access error */
-  {0x2a, SIGFPE},		/* divide by zero */
-  {0x2b, SIGBUS},		/* data store error */
-  {0x80+1, SIGTRAP},		/* ta 1 - normal breakpoint instruction */
-  {0xff, SIGTRAP},		/* hardware breakpoint */
-  {0, 0}			/* Must be last */
-};
-
-/* Set up exception handlers for tracing and breakpoints */
-
-void
-set_debug_traps()
-{
-  struct hard_trap_info *ht;
-
-/* Only setup fp traps if the FP is disabled.  */
-
-  for (ht = hard_trap_info;
-       ht->tt != 0 && ht->signo != 0;
-       ht++)
-    if (ht->tt != 4 || ! (read_psr () & 0x1000))
-      exceptionHandler(ht->tt, trap_low);
-
-  /* In case GDB is started before us, ack any packets (presumably
-     "$?#xx") sitting there.  */
-
-  putDebugChar ('+');
-
-  initialized = 1;
-}
-
-asm ("
-! Trap handler for memory errors.  This just sets mem_err to be non-zero.  It
-! assumes that %l1 is non-zero.  This should be safe, as it is doubtful that
-! 0 would ever contain code that could mem fault.  This routine will skip
-! past the faulting instruction after setting mem_err.
-
-	.text
-	.align 4
-
-_fltr_set_mem_err:
-	sethi %hi(_mem_err), %l0
-	st %l1, [%l0 + %lo(_mem_err)]
-	jmpl %l2, %g0
-	rett %l2+4
-");
-
-static void
-set_mem_fault_trap(enable)
-     int enable;
-{
-  extern void fltr_set_mem_err();
-  mem_err = 0;
-
-  if (enable)
-    exceptionHandler(9, fltr_set_mem_err);
-  else
-    exceptionHandler(9, trap_low);
-}
-
-asm ("
-	.text
-	.align 4
-
-_dummy_hw_breakpoint:
-	jmpl %l2, %g0
-	rett %l2+4
-	nop
-	nop
-");
-
-static void
-get_in_break_mode()
-{
-  extern void dummy_hw_breakpoint();
-
-  exceptionHandler (255, dummy_hw_breakpoint);
-
-  asm ("ta 255");
-
-  exceptionHandler (255, trap_low);
-}
-
-/* Convert the SPARC hardware trap type code to a unix signal number. */
-
-static int
-computeSignal(tt)
-     int tt;
-{
-  struct hard_trap_info *ht;
-
-  for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
-    if (ht->tt == tt)
-      return ht->signo;
-
-  return SIGHUP;		/* default for things we don't know about */
-}
-
-/*
- * While we find nice hex chars, build an int.
- * Return number of chars processed.
- */
-
-static int
-hexToInt(char **ptr, int *intValue)
-{
-  int numChars = 0;
-  int hexValue;
-
-  *intValue = 0;
-
-  while (**ptr)
-    {
-      hexValue = hex(**ptr);
-      if (hexValue < 0)
-	break;
-
-      *intValue = (*intValue << 4) | hexValue;
-      numChars ++;
-
-      (*ptr)++;
-    }
-
-  return (numChars);
-}
-
-/*
- * This function does all command procesing for interfacing to gdb.  It
- * returns 1 if you should skip the instruction at the trap address, 0
- * otherwise.
- */
-
-static void
-handle_exception (registers)
-     unsigned long *registers;
-{
-  int tt;			/* Trap type */
-  int sigval;
-  int addr;
-  int length;
-  char *ptr;
-  unsigned long *sp;
-  unsigned long dsr;
-
-/* First, we must force all of the windows to be spilled out */
-
-  asm("	save %sp, -64, %sp
-	save %sp, -64, %sp
-	save %sp, -64, %sp
-	save %sp, -64, %sp
-	save %sp, -64, %sp
-	save %sp, -64, %sp
-	save %sp, -64, %sp
-	save %sp, -64, %sp
-	restore
-	restore
-	restore
-	restore
-	restore
-	restore
-	restore
-	restore
-");
-
-  get_in_break_mode ();		/* Enable DSU register writes */
-
-  registers[DIA1] = read_asi (1, 0xff00);
-  registers[DIA2] = read_asi (1, 0xff04);
-  registers[DDA1] = read_asi (1, 0xff08);
-  registers[DDA2] = read_asi (1, 0xff0c);
-  registers[DDV1] = read_asi (1, 0xff10);
-  registers[DDV2] = read_asi (1, 0xff14);
-  registers[DCR] = read_asi (1, 0xff18);
-  registers[DSR] = read_asi (1, 0xff1c);
-
-  if (registers[PC] == (unsigned long)breakinst)
-    {
-      registers[PC] = registers[NPC];
-      registers[NPC] += 4;
-    }
-  sp = (unsigned long *)registers[SP];
-
-  dsr = (unsigned long)registers[DSR];
-  if (dsr & 0x3c)
-    tt = 255;
-  else
-    tt = (registers[TBR] >> 4) & 0xff;
-
-  /* reply to host that an exception has occurred */
-  sigval = computeSignal(tt);
-  ptr = remcomOutBuffer;
-
-  *ptr++ = 'T';
-  *ptr++ = hexchars[sigval >> 4];
-  *ptr++ = hexchars[sigval & 0xf];
-
-  *ptr++ = hexchars[PC >> 4];
-  *ptr++ = hexchars[PC & 0xf];
-  *ptr++ = ':';
-  ptr = mem2hex((char *)&registers[PC], ptr, 4, 0);
-  *ptr++ = ';';
-
-  *ptr++ = hexchars[FP >> 4];
-  *ptr++ = hexchars[FP & 0xf];
-  *ptr++ = ':';
-  ptr = mem2hex(sp + 8 + 6, ptr, 4, 0); /* FP */
-  *ptr++ = ';';
-
-  *ptr++ = hexchars[SP >> 4];
-  *ptr++ = hexchars[SP & 0xf];
-  *ptr++ = ':';
-  ptr = mem2hex((char *)&sp, ptr, 4, 0);
-  *ptr++ = ';';
-
-  *ptr++ = hexchars[NPC >> 4];
-  *ptr++ = hexchars[NPC & 0xf];
-  *ptr++ = ':';
-  ptr = mem2hex((char *)&registers[NPC], ptr, 4, 0);
-  *ptr++ = ';';
-
-  *ptr++ = hexchars[O7 >> 4];
-  *ptr++ = hexchars[O7 & 0xf];
-  *ptr++ = ':';
-  ptr = mem2hex((char *)&registers[O7], ptr, 4, 0);
-  *ptr++ = ';';
-
-  *ptr++ = 0;
-
-  putpacket(remcomOutBuffer);
-
-  while (1)
-    {
-      remcomOutBuffer[0] = 0;
-
-      getpacket(remcomInBuffer);
-      switch (remcomInBuffer[0])
-	{
-	case '?':
-	  remcomOutBuffer[0] = 'S';
-	  remcomOutBuffer[1] = hexchars[sigval >> 4];
-	  remcomOutBuffer[2] = hexchars[sigval & 0xf];
-	  remcomOutBuffer[3] = 0;
-	  break;
-
-	case 'd':
-				/* toggle debug flag */
-	  break;
-
-	case 'g':		/* return the value of the CPU registers */
-	  memcpy (&registers[L0], sp, 16 * 4); /* Copy L & I regs from stack */
-	  mem2hex ((char *)registers, remcomOutBuffer, NUMREGBYTES, 0);
-	  break;
-
-	case 'G':		/* Set the value of all registers */
-	case 'P':		/* Set the value of one register */
-	  {
-	    unsigned long *newsp, psr;
-
-	    psr = registers[PSR];
-
-	    ptr = &remcomInBuffer[1];
-
-	    if (remcomInBuffer[0] == 'P')
-	      {
-		int regno;
-
-		if (hexToInt (&ptr, &regno)
-		    && *ptr++ == '=')
-		  if (regno >= L0 && regno <= I7)
-		    hex2mem (ptr, sp + regno - L0, 4, 0);
-		  else
-		    hex2mem (ptr, (char *)&registers[regno], 4, 0);
-		else
-		  {
-		    strcpy (remcomOutBuffer, "P01");
-		    break;
-		  }
-	      }
-	    else
-	      {
-		hex2mem (ptr, (char *)registers, NUMREGBYTES, 0);
-		memcpy (sp, &registers[L0], 16 * 4); /* Copy L & I regs to stack */
-	      }
-
-	    /* See if the stack pointer has moved.  If so, then copy the saved
-	       locals and ins to the new location.  This keeps the window
-	       overflow and underflow routines happy.  */
-
-	    newsp = (unsigned long *)registers[SP];
-	    if (sp != newsp)
-	      sp = memcpy(newsp, sp, 16 * 4);
-
-	    /* Don't allow CWP to be modified. */
-
-	    if (psr != registers[PSR])
-	      registers[PSR] = (psr & 0x1f) | (registers[PSR] & ~0x1f);
-
-	    strcpy(remcomOutBuffer,"OK");
-	  }
-	  break;
-
-	case 'm':	  /* mAA..AA,LLLL  Read LLLL bytes at address AA..AA */
-	  /* Try to read %x,%x.  */
-
-	  ptr = &remcomInBuffer[1];
-
-	  if (hexToInt(&ptr, &addr)
-	      && *ptr++ == ','
-	      && hexToInt(&ptr, &length))
-	    {
-	      if (mem2hex((char *)addr, remcomOutBuffer, length, 1))
-		break;
-
-	      strcpy (remcomOutBuffer, "E03");
-	    }
-	  else
-	    strcpy(remcomOutBuffer,"E01");
-	  break;
-
-	case 'M': /* MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK */
-	  /* Try to read '%x,%x:'.  */
-
-	  ptr = &remcomInBuffer[1];
-
-	  if (hexToInt(&ptr, &addr)
-	      && *ptr++ == ','
-	      && hexToInt(&ptr, &length)
-	      && *ptr++ == ':')
-	    {
-	      if (hex2mem(ptr, (char *)addr, length, 1))
-		strcpy(remcomOutBuffer, "OK");
-	      else
-		strcpy(remcomOutBuffer, "E03");
-	    }
-	  else
-	    strcpy(remcomOutBuffer, "E02");
-	  break;
-
-	case 'c':    /* cAA..AA    Continue at address AA..AA(optional) */
-	  /* try to read optional parameter, pc unchanged if no parm */
-
-	  ptr = &remcomInBuffer[1];
-	  if (hexToInt(&ptr, &addr))
-	    {
-	      registers[PC] = addr;
-	      registers[NPC] = addr + 4;
-	    }
-
-/* Need to flush the instruction cache here, as we may have deposited a
-   breakpoint, and the icache probably has no way of knowing that a data ref to
-   some location may have changed something that is in the instruction cache.
- */
-
-	  flush_i_cache ();
-
-	  if (!(registers[DSR] & 0x1) /* DSU enabled? */
-	      && !(registers[DCR] & 0x200)) /* Are we in break state? */
-	    {			/* Yes, set the DSU regs */
-	      write_asi (1, 0xff00, registers[DIA1]);
-	      write_asi (1, 0xff04, registers[DIA2]);
-	      write_asi (1, 0xff08, registers[DDA1]);
-	      write_asi (1, 0xff0c, registers[DDA2]);
-	      write_asi (1, 0xff10, registers[DDV1]);
-	      write_asi (1, 0xff14, registers[DDV2]);
-	      write_asi (1, 0xff1c, registers[DSR]);
-	      write_asi (1, 0xff18, registers[DCR] | 0x200); /* Clear break */
-	    }
-
-	  return;
-
-	  /* kill the program */
-	case 'k' :		/* do nothing */
-	  break;
-#if 0
-	case 't':		/* Test feature */
-	  asm (" std %f30,[%sp]");
-	  break;
-#endif
-	case 'r':		/* Reset */
-	  asm ("call 0
-		nop ");
-	  break;
-
-#if 0
-Disabled until we can unscrew this properly
-
-	case 'b':	  /* bBB...  Set baud rate to BB... */
-	  {
-	    int baudrate;
-	    extern void set_timer_3();
-
-	    ptr = &remcomInBuffer[1];
-	    if (!hexToInt(&ptr, &baudrate))
-	      {
-		strcpy(remcomOutBuffer,"B01");
-		break;
-	      }
-
-	    /* Convert baud rate to uart clock divider */
-	    switch (baudrate)
-	      {
-	      case 38400:
-		baudrate = 16;
-		break;
-	      case 19200:
-		baudrate = 33;
-		break;
-	      case 9600:
-		baudrate = 65;
-		break;
-	      default:
-		strcpy(remcomOutBuffer,"B02");
-		goto x1;
-	      }
-
-	    putpacket("OK");	/* Ack before changing speed */
-	    set_timer_3(baudrate); /* Set it */
-	  }
-x1:	  break;
-#endif
-	}			/* switch */
-
-      /* reply to the request */
-      putpacket(remcomOutBuffer);
-    }
-}
-
-/* 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()
-{
-  if (!initialized)
-    return;
-
-  asm("	.globl _breakinst
-
-	_breakinst: ta 1
-      ");
-}