sparc: Add kgdb support.

Current limitations:

1) On SMP single stepping has some fundamental issues,
   shared with other sw single-step architectures such
   as mips and arm.

2) On 32-bit sparc we don't support SMP kgdb yet.  That
   requires some reworking of the IPI mechanisms and
   infrastructure on that platform.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 0 insertions, 724 deletions

diff --git a/arch/sparc/kernel/sparc-stub.c b/arch/sparc/kernel/sparc-stub.c
deleted file mode 100644
index e84f815e690..00000000000
--- a/arch/sparc/kernel/sparc-stub.c
+++ /dev/null
@@ -1,724 +0,0 @@
-/* $Id: sparc-stub.c,v 1.28 2001/10/30 04:54:21 davem Exp $
- * sparc-stub.c:  KGDB support for the Linux kernel.
- *
- * Modifications to run under Linux
- * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
- *
- * This file originally came from the gdb sources, and the
- * copyright notices have been retained below.
- */
-
-/****************************************************************************
-
-		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 its 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.
- *
- *  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 <linux/kernel.h>
-#include <linux/string.h>
-#include <linux/mm.h>
-#include <linux/smp.h>
-#include <linux/smp_lock.h>
-
-#include <asm/system.h>
-#include <asm/signal.h>
-#include <asm/oplib.h>
-#include <asm/head.h>
-#include <asm/traps.h>
-#include <asm/vac-ops.h>
-#include <asm/kgdb.h>
-#include <asm/pgalloc.h>
-#include <asm/pgtable.h>
-#include <asm/cacheflush.h>
-
-/*
- *
- * external low-level support routines
- */
-
-extern void putDebugChar(char);   /* write a single character      */
-extern char 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 means we've been initialized */
-
-static const char hexchars[]="0123456789abcdef";
-
-#define NUMREGS 72
-
-/* 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 };
-
-
-extern void trap_low(void);  /* In arch/sparc/kernel/entry.S */
-
-unsigned long get_sun4cpte(unsigned long addr)
-{
-	unsigned long entry;
-
-	__asm__ __volatile__("\n\tlda [%1] %2, %0\n\t" : 
-			     "=r" (entry) :
-			     "r" (addr), "i" (ASI_PTE));
-	return entry;
-}
-
-unsigned long get_sun4csegmap(unsigned long addr)
-{
-	unsigned long entry;
-
-	__asm__ __volatile__("\n\tlduba [%1] %2, %0\n\t" : 
-			     "=r" (entry) :
-			     "r" (addr), "i" (ASI_SEGMAP));
-	return entry;
-}
-
-#if 0
-/* Have to sort this out. This cannot be done after initialization. */
-static void flush_cache_all_nop(void) {}
-#endif
-
-/* Place where we save old trap entries for restoration */
-struct tt_entry kgdb_savettable[256];
-typedef void (*trapfunc_t)(void);
-
-/* Helper routine for manipulation of kgdb_savettable */
-static inline void copy_ttentry(struct tt_entry *src, struct tt_entry *dest)
-{
-	dest->inst_one = src->inst_one;
-	dest->inst_two = src->inst_two;
-	dest->inst_three = src->inst_three;
-	dest->inst_four = src->inst_four;
-}
-
-/* Initialize the kgdb_savettable so that debugging can commence */
-static void eh_init(void)
-{
-	int i;
-
-	for(i=0; i < 256; i++)
-		copy_ttentry(&sparc_ttable[i], &kgdb_savettable[i]);
-}
-
-/* Install an exception handler for kgdb */
-static void exceptionHandler(int tnum, trapfunc_t trap_entry)
-{
-	unsigned long te_addr = (unsigned long) trap_entry;
-
-	/* Make new vector */
-	sparc_ttable[tnum].inst_one =
-		SPARC_BRANCH((unsigned long) te_addr,
-			     (unsigned long) &sparc_ttable[tnum].inst_one);
-	sparc_ttable[tnum].inst_two = SPARC_RD_PSR_L0;
-	sparc_ttable[tnum].inst_three = SPARC_NOP;
-	sparc_ttable[tnum].inst_four = SPARC_NOP;
-}
-
-/* Convert ch from a hex digit to an int */
-static int
-hex(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 $<data>#<checksum>     */
-static void
-getpacket(char *buffer)
-{
-	unsigned char checksum;
-	unsigned char xmitcsum;
-	int i;
-	int count;
-	unsigned char ch;
-
-	do {
-		/* wait around for the start character, ignore all other characters */
-		while ((ch = (getDebugChar() & 0x7f)) != '$') ;
-
-		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 (checksum != xmitcsum)
-				putDebugChar('-');	/* failed checksum */
-			else {
-				putDebugChar('+'); /* successful transfer */
-				/* if a sequence char is present, reply the 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(unsigned char *buffer)
-{
-	unsigned char checksum;
-	int count;
-	unsigned char ch, recv;
-
-	/*  $<packet info>#<checksum>. */
-	do {
-		putDebugChar('$');
-		checksum = 0;
-		count = 0;
-
-		while ((ch = buffer[count])) {
-			putDebugChar(ch);
-			checksum += ch;
-			count += 1;
-		}
-
-		putDebugChar('#');
-		putDebugChar(hexchars[checksum >> 4]);
-		putDebugChar(hexchars[checksum & 0xf]);
-		recv = getDebugChar();
-	} while ((recv & 0x7f) != '+');
-}
-
-static char remcomInBuffer[BUFMAX];
-static char remcomOutBuffer[BUFMAX];
-
-/* 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.
- */
-
-static unsigned char *
-mem2hex(char *mem, char *buf, int count)
-{
-	unsigned char ch;
-
-	while (count-- > 0) {
-		/* This assembler code is basically:  ch = *mem++;
-		 * except that we use the SPARC/Linux exception table
-		 * mechanism (see how "fixup" works in kernel_mna_trap_fault)
-		 * to arrange for a "return 0" upon a memory fault
-		 */
-		__asm__(
-			"\n1:\n\t"
-			"ldub [%0], %1\n\t"
-			"inc %0\n\t"
-			".section .fixup,#alloc,#execinstr\n\t"
-			".align 4\n"
-			"2:\n\t"
-			"retl\n\t"
-			" mov 0, %%o0\n\t"
-			".section __ex_table, #alloc\n\t"
-			".align 4\n\t"
-			".word 1b, 2b\n\t"
-			".text\n"
-			: "=r" (mem), "=r" (ch) : "0" (mem));
-		*buf++ = hexchars[ch >> 4];
-		*buf++ = hexchars[ch & 0xf];
-	}
-
-	*buf = 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(char *buf, char *mem, int count)
-{
-	int i;
-	unsigned char ch;
-
-	for (i=0; i<count; i++) {
-
-		ch = hex(*buf++) << 4;
-		ch |= hex(*buf++);
-		/* Assembler code is   *mem++ = ch;   with return 0 on fault */
-		__asm__(
-			"\n1:\n\t"
-			"stb %1, [%0]\n\t"
-			"inc %0\n\t"
-			".section .fixup,#alloc,#execinstr\n\t"
-			".align 4\n"
-			"2:\n\t"
-			"retl\n\t"
-			" mov 0, %%o0\n\t"
-			".section __ex_table, #alloc\n\t"
-			".align 4\n\t"
-			".word 1b, 2b\n\t"
-			".text\n"
-			: "=r" (mem) : "r" (ch) , "0" (mem));
-	}
-	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 SPARC */
-  unsigned char signo;		/* Signal that we map this trap into */
-} hard_trap_info[] = {
-  {SP_TRAP_SBPT, SIGTRAP},      /* ta 1 - Linux/KGDB software breakpoint */
-  {0, 0}			/* Must be last */
-};
-
-/* Set up exception handlers for tracing and breakpoints */
-
-void
-set_debug_traps(void)
-{
-	struct hard_trap_info *ht;
-	unsigned long flags;
-
-	local_irq_save(flags);
-#if 0	
-/* Have to sort this out. This cannot be done after initialization. */
-	BTFIXUPSET_CALL(flush_cache_all, flush_cache_all_nop, BTFIXUPCALL_NOP);
-#endif
-
-	/* Initialize our copy of the Linux Sparc trap table */
-	eh_init();
-
-	for (ht = hard_trap_info; ht->tt && ht->signo; ht++) {
-		/* Only if it doesn't destroy our fault handlers */
-		if((ht->tt != SP_TRAP_TFLT) && 
-		   (ht->tt != SP_TRAP_DFLT))
-			exceptionHandler(ht->tt, trap_low);
-	}
-
-	/* In case GDB is started before us, ack any packets (presumably
-	 * "$?#xx") sitting there.
-	 *
-	 * I've found this code causes more problems than it solves,
-	 * so that's why it's commented out.  GDB seems to work fine
-	 * now starting either before or after the kernel   -bwb
-	 */
-#if 0
-	while((c = getDebugChar()) != '$');
-	while((c = getDebugChar()) != '#');
-	c = getDebugChar(); /* eat first csum byte */
-	c = getDebugChar(); /* eat second csum byte */
-	putDebugChar('+'); /* ack it */
-#endif
-
-	initialized = 1; /* connect! */
-	local_irq_restore(flags);
-}
-
-/* Convert the SPARC hardware trap type code to a unix signal number. */
-
-static int
-computeSignal(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 processing for interfacing to gdb.  It
- * returns 1 if you should skip the instruction at the trap address, 0
- * otherwise.
- */
-
-extern void breakinst(void);
-
-void
-handle_exception (unsigned long *registers)
-{
-	int tt;       /* Trap type */
-	int sigval;
-	int addr;
-	int length;
-	char *ptr;
-	unsigned long *sp;
-
-	/* First, we must force all of the windows to be spilled out */
-
-	asm("save %sp, -64, %sp\n\t"
-	    "save %sp, -64, %sp\n\t"
-	    "save %sp, -64, %sp\n\t"
-	    "save %sp, -64, %sp\n\t"
-	    "save %sp, -64, %sp\n\t"
-	    "save %sp, -64, %sp\n\t"
-	    "save %sp, -64, %sp\n\t"
-	    "save %sp, -64, %sp\n\t"
-	    "restore\n\t"
-	    "restore\n\t"
-	    "restore\n\t"
-	    "restore\n\t"
-	    "restore\n\t"
-	    "restore\n\t"
-	    "restore\n\t"
-	    "restore\n\t");
-
-	lock_kernel();
-	if (registers[PC] == (unsigned long)breakinst) {
-		/* Skip over breakpoint trap insn */
-		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);
-	*ptr++ = ';';
-
-	*ptr++ = hexchars[FP >> 4];
-	*ptr++ = hexchars[FP & 0xf];
-	*ptr++ = ':';
-	ptr = mem2hex((char *) (sp + 8 + 6), ptr, 4); /* FP */
-	*ptr++ = ';';
-
-	*ptr++ = hexchars[SP >> 4];
-	*ptr++ = hexchars[SP & 0xf];
-	*ptr++ = ':';
-	ptr = mem2hex((char *)&sp, ptr, 4);
-	*ptr++ = ';';
-
-	*ptr++ = hexchars[NPC >> 4];
-	*ptr++ = hexchars[NPC & 0xf];
-	*ptr++ = ':';
-	ptr = mem2hex((char *)&registers[NPC], ptr, 4);
-	*ptr++ = ';';
-
-	*ptr++ = hexchars[O7 >> 4];
-	*ptr++ = hexchars[O7 & 0xf];
-	*ptr++ = ':';
-	ptr = mem2hex((char *)&registers[O7], ptr, 4);
-	*ptr++ = ';';
-
-	*ptr++ = 0;
-
-	putpacket(remcomOutBuffer);
-
-	/* XXX We may want to add some features dealing with poking the
-	 * XXX page tables, the real ones on the srmmu, and what is currently
-	 * XXX loaded in the sun4/sun4c tlb at this point in time.  But this
-	 * XXX also required hacking to the gdb sources directly...
-	 */
-
-	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 */
-		{
-			ptr = remcomOutBuffer;
-			/* G & O regs */
-			ptr = mem2hex((char *)registers, ptr, 16 * 4);
-			/* L & I regs */
-			ptr = mem2hex((char *) (sp + 0), ptr, 16 * 4);
-			/* Floating point */
-			memset(ptr, '0', 32 * 8);
-			/* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
-			mem2hex((char *)&registers[Y], (ptr + 32 * 4 * 2), (8 * 4));
-		}
-			break;
-
-		case 'G':	   /* set the value of the CPU registers - return OK */
-		{
-			unsigned long *newsp, psr;
-
-			psr = registers[PSR];
-
-			ptr = &remcomInBuffer[1];
-			/* G & O regs */
-			hex2mem(ptr, (char *)registers, 16 * 4);
-			/* L & I regs */
-			hex2mem(ptr + 16 * 4 * 2, (char *) (sp + 0), 16 * 4);
-			/* Y, PSR, WIM, TBR, PC, NPC, FPSR, CPSR */
-			hex2mem(ptr + 64 * 4 * 2, (char *)&registers[Y], 8 * 4);
-
-			/* 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))
-					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)) {
-					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_cache_all();
-			unlock_kernel();
-			return;
-
-			/* kill the program */
-		case 'k' :		/* do nothing */
-			break;
-		case 'r':		/* Reset */
-			asm ("call 0\n\t"
-			     "nop\n\t");
-			break;
-		}			/* switch */
-
-		/* reply to the request */
-		putpacket(remcomOutBuffer);
-	} /* while(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)
-		return;
-
-	/* Again, watch those c-prefixes for ELF kernels */
-#if defined(__svr4__) || defined(__ELF__)
-	asm(".globl breakinst\n"
-	    "breakinst:\n\t"
-	    "ta 1\n");
-#else
-	asm(".globl _breakinst\n"
-	    "_breakinst:\n\t"
-	    "ta 1\n");
-#endif
-}