Initial creation of sourceware repository

1 files changed, 0 insertions, 1232 deletions

diff --git a/gdb/sparclet-stub.c b/gdb/sparclet-stub.c
deleted file mode 100644
index ecf670b..0000000
--- a/gdb/sparclet-stub.c
+++ /dev/null
@@ -1,1232 +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
- *    P             set the value of a single CPU register OK or P01 (???)
- *
- *    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>
-
-/************************************************************************
- *
- * external low-level support routines
- */
-
-extern void putDebugChar();	/* write a single character      */
-extern int getDebugChar();	/* 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 */
-static int remote_debug = 0;	/* turn on verbose debugging */
-
-extern void breakinst();
-void _cprint();
-static void hw_breakpoint();
-static void set_mem_fault_trap();
-static void get_in_break_mode();
-static unsigned char *mem2hex();
-
-static const char hexchars[]="0123456789abcdef";
-
-#define NUMREGS 121
-
-static unsigned long saved_stack_pointer;
-
-/* 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,
-		CCSR, CCPR, CCCRCR, CCOR, CCOBR, CCIBR, CCIR, UNUSED1,
-
-		ASR1, ASR15, ASR17, ASR18, ASR19, ASR20, ASR21, ASR22, 
-		/* the following not actually implemented */
-		AWR0,  AWR1,  AWR2,  AWR3,  AWR4,  AWR5,  AWR6,  AWR7,  
-		AWR8,  AWR9,  AWR10, AWR11, AWR12, AWR13, AWR14, AWR15,  
-		AWR16, AWR17, AWR18, AWR19, AWR20, AWR21, AWR22, AWR23,  
-		AWR24, AWR25, AWR26, AWR27, AWR28, AWR29, AWR30, AWR31,  
-		APSR
-};
-
-/***************************  ASSEMBLY CODE MACROS *************************/
-/* 									   */
-
-extern void trap_low();
-
-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.
-
-	.globl _trap_low
-_trap_low:
-	mov	%psr, %l0
-	mov	%wim, %l3
-
-	srl	%l3, %l0, %l4		! wim >> cwp
-	and	%l4, 0xff, %l4		! Mask off windows 28, 29
-	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
-	and	%g1, 0xff, %g1		! Mask off windows 28, 29
-	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.
-
-	! The normal way doesn't work on the sparclet as register windows
-	! 28 and 29 are special purpose windows.
-	!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	0x80, %g1		! Hack for sparclet
-
-	! This doesn't work on the sparclet.
-	!mov	%g0, %wim		! Clear wim so that subsequent save
-					!  won't trap
-	andn	%l3, 0xff, %l5		! Clear wim but not windows 28, 29
-	mov	%l5, %wim
-	nop
-	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+88)*4,%sp ! Make room for input & locals
- 					! + hidden arg + arg spill
-					! + doubleword alignment
-					! + registers[121]
-
-	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]
-
-	! FP regs (sparclet doesn't have fpu)
-
-	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
-					! CPSR and FPSR not impl
-	or	%l0, 0xf20, %l4
-	mov	%l4, %psr		! Turn on traps, disable interrupts
-	nop
-        nop
-        nop
-
-! Save coprocessor state.
-! See SK/demo/hdlc_demo/ldc_swap_context.S.
-
-	mov	%psr, %l0
-	sethi	%hi(0x2000), %l5		! EC bit in PSR
-	or	%l5, %l0, %l5
-	mov	%l5, %psr			! enable coprocessor
-	nop			! 3 nops after write to %psr (needed?)
-	nop
-	nop
-	crdcxt	%ccsr, %l1			! capture CCSR
-	mov	0x6, %l2
-	cwrcxt	%l2, %ccsr	! set CCP state machine for CCFR
-	crdcxt	%ccfr, %l2			! capture CCOR
-	cwrcxt	%l2, %ccfr			! tickle  CCFR
-	crdcxt	%ccfr, %l3			! capture CCOBR
-	cwrcxt	%l3, %ccfr			! tickle  CCFR
-	crdcxt	%ccfr, %l4			! capture CCIBR
-	cwrcxt	%l4, %ccfr			! tickle  CCFR
-	crdcxt	%ccfr, %l5			! capture CCIR
-	cwrcxt	%l5, %ccfr			! tickle  CCFR
-	crdcxt	%ccpr, %l6			! capture CCPR
-	crdcxt	%cccrcr, %l7			! capture CCCRCR
-	st	%l1, [%sp + (24 + 72) * 4]	! save CCSR
-	st	%l2, [%sp + (24 + 75) * 4]	! save CCOR
-	st	%l3, [%sp + (24 + 76) * 4]	! save CCOBR
-	st	%l4, [%sp + (24 + 77) * 4]	! save CCIBR
-	st	%l5, [%sp + (24 + 78) * 4]	! save CCIR
-	st	%l6, [%sp + (24 + 73) * 4]	! save CCPR
-	st	%l7, [%sp + (24 + 74) * 4]	! save CCCRCR
-	mov	%l0, %psr 			! restore original PSR
-	nop			! 3 nops after write to %psr (needed?)
-	nop
-	nop
-
-! End of saving coprocessor state.
-! Save asr regs
-
-! Part of this is silly -- we should not display ASR15 or ASR19 at all.
-
-	sethi	%hi(0x01000000), %l6
-	st	%l6, [%sp + (24 + 81) * 4]	! ASR15 == NOP
-	sethi	%hi(0xdeadc0de), %l6
-	or	%l6, %lo(0xdeadc0de), %l6
-	st	%l6, [%sp + (24 + 84) * 4]	! ASR19 == DEADC0DE
-
-	rd	%asr1, %l4
-	st	%l4, [%sp + (24 + 80) * 4]
-!	rd	%asr15, %l4			! must not read ASR15
-!	st	%l4, [%sp + (24 + 81) * 4]	! (illegal instr trap)
-	rd	%asr17, %l4
-	st	%l4, [%sp + (24 + 82) * 4]
-	rd	%asr18, %l4
-	st	%l4, [%sp + (24 + 83) * 4]
-!	rd	%asr19, %l4			! must not read asr19
-!	st	%l4, [%sp + (24 + 84) * 4]	! (halts the CPU)
-	rd	%asr20, %l4
-	st	%l4, [%sp + (24 + 85) * 4]
-	rd	%asr21, %l4
-	st	%l4, [%sp + (24 + 86) * 4]
-	rd	%asr22, %l4
-	st	%l4, [%sp + (24 + 87) * 4]
-
-! End of saving asr regs
-
-	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
-
-	! FP regs (sparclet doesn't have fpu)
-
-! Update the coprocessor registers.
-! See SK/demo/hdlc_demo/ldc_swap_context.S.
-
-	mov	%psr, %l0
-	sethi	%hi(0x2000), %l5		! EC bit in PSR
-	or	%l5, %l0, %l5
-	mov	%l5, %psr			! enable coprocessor
-	nop			! 3 nops after write to %psr (needed?)
-	nop
-	nop
-
-	mov 0x6, %l2
-	cwrcxt	%l2, %ccsr	! set CCP state machine for CCFR
-
-	ld	[%sp + (24 + 72) * 4], %l1	! saved CCSR
-	ld	[%sp + (24 + 75) * 4], %l2	! saved CCOR
-	ld	[%sp + (24 + 76) * 4], %l3	! saved CCOBR
-	ld	[%sp + (24 + 77) * 4], %l4	! saved CCIBR
-	ld	[%sp + (24 + 78) * 4], %l5	! saved CCIR
-	ld	[%sp + (24 + 73) * 4], %l6	! saved CCPR
-	ld	[%sp + (24 + 74) * 4], %l7	! saved CCCRCR
-
-	cwrcxt	%l2, %ccfr			! restore CCOR
-	cwrcxt	%l3, %ccfr			! restore CCOBR
-	cwrcxt	%l4, %ccfr			! restore CCIBR
-	cwrcxt	%l5, %ccfr			! restore CCIR
-	cwrcxt	%l6, %ccpr			! restore CCPR
-	cwrcxt	%l7, %cccrcr			! restore CCCRCR
-	cwrcxt	%l1, %ccsr			! restore CCSR
-
-	mov %l0, %psr				! restore PSR
-	nop		! 3 nops after write to %psr (needed?)
-	nop
-	nop
-
-! End of coprocessor handling stuff.
-! Update asr regs
-
-	ld	[%sp + (24 + 80) * 4], %l4
-	wr	%l4, %asr1
-!	ld	[%sp + (24 + 81) * 4], %l4	! can't write asr15
-!	wr	%l4, %asr15
-	ld	[%sp + (24 + 82) * 4], %l4
-	wr	%l4, %asr17
-	ld	[%sp + (24 + 83) * 4], %l4
-	wr	%l4, %asr18
-!	ld	[%sp + (24 + 84) * 4], %l4	! can't write asr19
-!	wr	%l4, %asr19
-!	ld	[%sp + (24 + 85) * 4], %l4	! can't write asr20
-!	wr	%l4, %asr20
-!	ld	[%sp + (24 + 86) * 4], %l4	! can't write asr21
-!	wr	%l4, %asr21
-	ld	[%sp + (24 + 87) * 4], %l4
-	wr	%l4, %asr22
-
-! End of restoring asr regs
-
-
-	ldd	[%sp + (24 + 64) * 4], %l0 ! Y & PSR
-	ldd	[%sp + (24 + 68) * 4], %l2 ! PC & NPC
-
-	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
-	nop	! 3 nops after write to %psr (needed?)
-	nop
-	nop
-
-	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(ch = getDebugChar() & 0x7f) << 4;
-	  xmitcsum |= hex(ch = getDebugChar() & 0x7f);
-
-	  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[] = {
-  {1, SIGSEGV},			/* instruction access exception */
-  {0x3b, SIGSEGV},		/* instruction access error */
-  {2, SIGILL},			/* illegal    instruction */
-  {3, SIGILL},			/* privileged instruction */
-  {4, SIGEMT},			/* fp disabled */
-  {0x24, SIGEMT},		/* cp disabled */
-  {7, SIGBUS},			/* mem address not aligned */
-  {0x29, SIGSEGV},		/* data access exception */
-  {10, SIGEMT},			/* tag overflow */
-  {128+1, SIGTRAP},		/* ta 1 - normal breakpoint instruction */
-  {0, 0}			/* Must be last */
-};
-
-/* Set up exception handlers for tracing and breakpoints */
-
-void
-set_debug_traps()
-{
-  struct hard_trap_info *ht;
-
-  for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
-    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(0x29, fltr_set_mem_err);
-  else
-    exceptionHandler(0x29, trap_low);
-}
-
-asm ("
-	.text
-	.align 4
-
-_dummy_hw_breakpoint:
-	jmpl %l2, %g0
-	rett %l2+4
-	nop
-	nop
-");
-
-static void
-set_hw_breakpoint_trap(enable)
-     int enable;
-{
-  extern void dummy_hw_breakpoint();
-
-  if (enable)
-    exceptionHandler(255, dummy_hw_breakpoint);
-  else
-    exceptionHandler(255, trap_low);
-}
-
-static void
-get_in_break_mode()
-{
-#if 0
-  int x;
-  mesg("get_in_break_mode, sp = ");
-  phex(&x);
-#endif
-  set_hw_breakpoint_trap(1);
-
-  asm("
-        sethi   %hi(0xff10), %l4
-        or      %l4, %lo(0xff10), %l4
-	sta 	%g0, [%l4]0x1	
-	nop
-	nop
-	nop
-      ");
-
-  set_hw_breakpoint_trap(0);
-}
-
-/* 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("
-	! Ugh.  sparclet has broken save
-	!save %sp, -64, %sp
-	save
-	add %fp,-64,%sp
-	!save %sp, -64, %sp
-	save
-	add %fp,-64,%sp
-	!save %sp, -64, %sp
-	save
-	add %fp,-64,%sp
-	!save %sp, -64, %sp
-	save
-	add %fp,-64,%sp
-	!save %sp, -64, %sp
-	save
-	add %fp,-64,%sp
-	!save %sp, -64, %sp
-	save
-	add %fp,-64,%sp
-	!save %sp, -64, %sp
-	save
-	add %fp,-64,%sp
-	!save %sp, -64, %sp
-	save
-	add %fp,-64,%sp
-	restore
-	restore
-	restore
-	restore
-	restore
-	restore
-	restore
-	restore
-");
-
-  if (registers[PC] == (unsigned long)breakinst)
-    {
-      registers[PC] = registers[NPC];
-      registers[NPC] += 4;
-    }
-  sp = (unsigned long *)registers[SP];
-
-  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':
-	  remote_debug = !(remote_debug);	/* toggle debug flag */
-	  break;
-
-	case 'g':		/* return the value of the CPU registers */
-	  {
-	    ptr = remcomOutBuffer;
-	    ptr = mem2hex((char *)registers, ptr, 16 * 4, 0); /* G & O regs */
-	    ptr = mem2hex(sp + 0, ptr, 16 * 4, 0); /* L & I regs */
-	    memset(ptr, '0', 32 * 8); /* Floating point */
-	    ptr = mem2hex((char *)&registers[Y],
-		    ptr + 32 * 4 * 2,
-		    8 * 4,
-		    0); /* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
-	    ptr = mem2hex((char *)&registers[CCSR],
-		    ptr,
-		    8 * 4,
-		    0); /* CCSR, CCPR, CCCRCR, CCOR, CCOBR, CCIBR, CCIR */
-	    ptr = mem2hex((char *)&registers[ASR1],
-		    ptr,
-		    8 * 4,
-		    0); /* ASR1,ASR15,ASR17,ASR18,ASR19,ASR20,ASR21,ASR22 */
-#if 0 /* not implemented */
-	    ptr = mem2hex((char *) &registers[AWR0], 
-		    ptr, 
-		    32 * 4, 
-		    0); /* Alternate Window Registers */
-#endif
-	  }
-	  break;
-
-	case 'G':	/* set value of all the CPU registers - return OK */
-	case 'P':	/* set value of one CPU register      - return OK */
-	  {
-	    unsigned long *newsp, psr;
-
-	    psr = registers[PSR];
-
-	    ptr = &remcomInBuffer[1];
-
-	    if (remcomInBuffer[0] == 'P')	/* do a single register */
-	      {
-		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, 16 * 4, 0); /* G & O regs */
-		hex2mem(ptr + 16 * 4 * 2, sp + 0, 16 * 4, 0); /* L & I regs */
-		hex2mem(ptr + 64 * 4 * 2, (char *)&registers[Y],
-			8 * 4, 0); /* Y,PSR,WIM,TBR,PC,NPC,FPSR,CPSR */
-		hex2mem(ptr + 72 * 4 * 2, (char *)&registers[CCSR],
-			8 * 4, 0); /* CCSR,CCPR,CCCRCR,CCOR,CCOBR,CCIBR,CCIR */
-		hex2mem(ptr + 80 * 4 * 2, (char *)&registers[ASR1],
-			8 * 4, 0); /* ASR1 ... ASR22 */
-#if 0 /* not implemented */
-		hex2mem(ptr + 88 * 4 * 2, (char *)&registers[AWR0],
-			8 * 4, 0); /* Alternate Window Registers */
-#endif
-	      }
-	    /* 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();
-	  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
-      ");
-}
-
-static void
-hw_breakpoint()
-{
-  asm("
-      ta 127
-      ");
-}
-
-#if 0 /* experimental and never finished, left here for reference */
-static void
-splet_temp(void)
-{
-  asm("	sub	%sp,(16+1+6+1+121)*4,%sp ! Make room for input & locals
- 					! + hidden arg + arg spill
-					! + doubleword alignment
-					! + registers[121]
-
-! Leave a trail of breadcrumbs! (save register save area for debugging)
-	mov	%sp, %l0
-	add	%l0, 24*4, %l0
-	sethi	%hi(_debug_registers), %l1
-	st	%l0, [%lo(_debug_registers) + %l1]
-
-! Save the Alternate Register Set: (not implemented yet)
-!    To save the Alternate Register set, we must:
-!    1) Save the current SP in some global location.
-!    2) Swap the register sets.
-!    3) Save the Alternate SP in the Y register
-!    4) Fetch the SP that we saved in step 1.
-!    5) Use that to save the rest of the regs (not forgetting ASP in Y)
-!    6) Restore the Alternate SP from Y
-!    7) Swap the registers back.
-
-! 1) Copy the current stack pointer to global _SAVED_STACK_POINTER:
-	sethi	%hi(_saved_stack_pointer), %l0
-	st	%sp, [%lo(_saved_stack_pointer) + %l0]
-
-! 2) Swap the register sets:
-	mov	%psr, %l1
-	sethi	%hi(0x10000), %l2
-	xor	%l1, %l2, %l1
-	mov	%l1, %psr
-	nop			! 3 nops after write to %psr (needed?)
-	nop
-	nop
-
-! 3) Save Alternate L0 in Y
-	wr	%l0, 0, %y
-
-! 4) Load former SP into alternate SP, using L0
-	sethi	%hi(_saved_stack_pointer), %l0
-	or	%lo(_saved_stack_pointer), %l0, %l0
-	swap	[%l0], %sp
-
-! 4.5) Restore alternate L0
-	rd	%y, %l0
-
-! 5) Save the Alternate Window Registers
-	st	%r0, [%sp + (24 + 88) * 4]	! AWR0
-	st	%r1, [%sp + (24 + 89) * 4]	! AWR1
-	st	%r2, [%sp + (24 + 90) * 4]	! AWR2
-	st	%r3, [%sp + (24 + 91) * 4]	! AWR3
-	st	%r4, [%sp + (24 + 92) * 4]	! AWR4
-	st	%r5, [%sp + (24 + 93) * 4]	! AWR5
-	st	%r6, [%sp + (24 + 94) * 4]	! AWR6
-	st	%r7, [%sp + (24 + 95) * 4]	! AWR7
-	st	%r8, [%sp + (24 + 96) * 4]	! AWR8
-	st	%r9, [%sp + (24 + 97) * 4]	! AWR9
-	st	%r10, [%sp + (24 + 98) * 4]	! AWR10
-	st	%r11, [%sp + (24 + 99) * 4]	! AWR11
-	st	%r12, [%sp + (24 + 100) * 4]	! AWR12
-	st	%r13, [%sp + (24 + 101) * 4]	! AWR13
-!	st	%r14, [%sp + (24 + 102) * 4]	! AWR14	(SP)
-	st	%r15, [%sp + (24 + 103) * 4]	! AWR15
-	st	%r16, [%sp + (24 + 104) * 4]	! AWR16
-	st	%r17, [%sp + (24 + 105) * 4]	! AWR17
-	st	%r18, [%sp + (24 + 106) * 4]	! AWR18
-	st	%r19, [%sp + (24 + 107) * 4]	! AWR19
-	st	%r20, [%sp + (24 + 108) * 4]	! AWR20
-	st	%r21, [%sp + (24 + 109) * 4]	! AWR21
-	st	%r22, [%sp + (24 + 110) * 4]	! AWR22
-	st	%r23, [%sp + (24 + 111) * 4]	! AWR23
-	st	%r24, [%sp + (24 + 112) * 4]	! AWR24
-	st	%r25, [%sp + (24 + 113) * 4]	! AWR25
-	st	%r26, [%sp + (24 + 114) * 4]	! AWR26
-	st	%r27, [%sp + (24 + 115) * 4]	! AWR27
-	st	%r28, [%sp + (24 + 116) * 4]	! AWR28
-	st	%r29, [%sp + (24 + 117) * 4]	! AWR29
-	st	%r30, [%sp + (24 + 118) * 4]	! AWR30
-	st	%r31, [%sp + (24 + 119) * 4]	! AWR21
-
-! Get the Alternate PSR (I hope...)
-
-	rd	%psr, %l2
-	st	%l2, [%sp + (24 + 120) * 4]	! APSR
-
-! Don't forget the alternate stack pointer
-
-	rd	%y, %l3
-	st	%l3, [%sp + (24 + 102) * 4]	! AWR14 (SP)
-
-! 6) Restore the Alternate SP (saved in Y)
-
-	rd	%y, %o6
-
-
-! 7) Swap the registers back:
-
-	mov	%psr, %l1
-	sethi	%hi(0x10000), %l2
-	xor	%l1, %l2, %l1
-	mov	%l1, %psr
-	nop			! 3 nops after write to %psr (needed?)
-	nop
-	nop
-");
-}
-
-#endif