[MIPS] kgdb: Remove existing implementation

This patch explicitly removes the kgdb implementation, for mips which
is intended to be followed by a patch that adds a kgdb implementation
for MIPS that makes use of the kgdb core in the kernel.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 0 insertions, 1155 deletions

diff --git a/arch/mips/kernel/gdb-stub.c b/arch/mips/kernel/gdb-stub.c
deleted file mode 100644
index 25f4eab8ea9..00000000000
--- a/arch/mips/kernel/gdb-stub.c
+++ /dev/null
@@ -1,1155 +0,0 @@
-/*
- *  arch/mips/kernel/gdb-stub.c
- *
- *  Originally written by Glenn Engel, Lake Stevens Instrument Division
- *
- *  Contributed by HP Systems
- *
- *  Modified for SPARC by Stu Grossman, Cygnus Support.
- *
- *  Modified for Linux/MIPS (and MIPS in general) by Andreas Busse
- *  Send complaints, suggestions etc. to <andy@waldorf-gmbh.de>
- *
- *  Copyright (C) 1995 Andreas Busse
- *
- *  Copyright (C) 2003 MontaVista Software Inc.
- *  Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
- */
-
-/*
- *  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 BREAK instruction.
- *
- *
- *    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
- *
- *
- *  ==============
- *  MORE EXAMPLES:
- *  ==============
- *
- *  For reference -- the following are the steps that one
- *  company took (RidgeRun Inc) to get remote gdb debugging
- *  going. In this scenario the host machine was a PC and the
- *  target platform was a Galileo EVB64120A MIPS evaluation
- *  board.
- *
- *  Step 1:
- *  First download gdb-5.0.tar.gz from the internet.
- *  and then build/install the package.
- *
- *  Example:
- *    $ tar zxf gdb-5.0.tar.gz
- *    $ cd gdb-5.0
- *    $ ./configure --target=mips-linux-elf
- *    $ make
- *    $ install
- *    $ which mips-linux-elf-gdb
- *    /usr/local/bin/mips-linux-elf-gdb
- *
- *  Step 2:
- *  Configure linux for remote debugging and build it.
- *
- *  Example:
- *    $ cd ~/linux
- *    $ make menuconfig <go to "Kernel Hacking" and turn on remote debugging>
- *    $ make
- *
- *  Step 3:
- *  Download the kernel to the remote target and start
- *  the kernel running. It will promptly halt and wait
- *  for the host gdb session to connect. It does this
- *  since the "Kernel Hacking" option has defined
- *  CONFIG_KGDB which in turn enables your calls
- *  to:
- *     set_debug_traps();
- *     breakpoint();
- *
- *  Step 4:
- *  Start the gdb session on the host.
- *
- *  Example:
- *    $ mips-linux-elf-gdb vmlinux
- *    (gdb) set remotebaud 115200
- *    (gdb) target remote /dev/ttyS1
- *    ...at this point you are connected to
- *       the remote target and can use gdb
- *       in the normal fasion. Setting
- *       breakpoints, single stepping,
- *       printing variables, etc.
- */
-#include <linux/string.h>
-#include <linux/kernel.h>
-#include <linux/signal.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <linux/console.h>
-#include <linux/init.h>
-#include <linux/smp.h>
-#include <linux/spinlock.h>
-#include <linux/slab.h>
-#include <linux/reboot.h>
-
-#include <asm/asm.h>
-#include <asm/cacheflush.h>
-#include <asm/mipsregs.h>
-#include <asm/pgtable.h>
-#include <asm/system.h>
-#include <asm/gdb-stub.h>
-#include <asm/inst.h>
-
-/*
- * external low-level support routines
- */
-
-extern int putDebugChar(char c);    /* write a single character      */
-extern char getDebugChar(void);     /* read and return a single char */
-extern void trap_low(void);
-
-/*
- * breakpoint and test functions
- */
-extern void breakpoint(void);
-extern void breakinst(void);
-extern void async_breakpoint(void);
-extern void async_breakinst(void);
-extern void adel(void);
-
-/*
- * local prototypes
- */
-
-static void getpacket(char *buffer);
-static void putpacket(char *buffer);
-static int computeSignal(int tt);
-static int hex(unsigned char ch);
-static int hexToInt(char **ptr, int *intValue);
-static int hexToLong(char **ptr, long *longValue);
-static unsigned char *mem2hex(char *mem, char *buf, int count, int may_fault);
-void handle_exception(struct gdb_regs *regs);
-
-int kgdb_enabled;
-
-/*
- * spin locks for smp case
- */
-static DEFINE_SPINLOCK(kgdb_lock);
-static raw_spinlock_t kgdb_cpulock[NR_CPUS] = {
-	[0 ... NR_CPUS-1] = __RAW_SPIN_LOCK_UNLOCKED,
-};
-
-/*
- * BUFMAX defines the maximum number of characters in inbound/outbound buffers
- * at least NUMREGBYTES*2 are needed for register packets
- */
-#define BUFMAX 2048
-
-static char input_buffer[BUFMAX];
-static char output_buffer[BUFMAX];
-static int initialized;	/* !0 means we've been initialized */
-static int kgdb_started;
-static const char hexchars[]="0123456789abcdef";
-
-/* Used to prevent crashes in memory access.  Note that they'll crash anyway if
-   we haven't set up fault handlers yet... */
-int kgdb_read_byte(unsigned char *address, unsigned char *dest);
-int kgdb_write_byte(unsigned char val, unsigned char *dest);
-
-/*
- * 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();
-			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 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(char *buffer)
-{
-	unsigned char checksum;
-	int count;
-	unsigned char ch;
-
-	/*
-	 * $<packet info>#<checksum>.
-	 */
-
-	do {
-		putDebugChar('$');
-		checksum = 0;
-		count = 0;
-
-		while ((ch = buffer[count]) != 0) {
-			if (!(putDebugChar(ch)))
-				return;
-			checksum += ch;
-			count += 1;
-		}
-
-		putDebugChar('#');
-		putDebugChar(hexchars[checksum >> 4]);
-		putDebugChar(hexchars[checksum & 0xf]);
-
-	}
-	while ((getDebugChar() & 0x7f) != '+');
-}
-
-
-/*
- * 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.
- * may_fault is non-zero if we are reading from arbitrary memory, but is currently
- * not used.
- */
-static unsigned char *mem2hex(char *mem, char *buf, int count, int may_fault)
-{
-	unsigned char ch;
-
-	while (count-- > 0) {
-		if (kgdb_read_byte(mem++, &ch) != 0)
-			return 0;
-		*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
- * may_fault is non-zero if we are reading from arbitrary memory, but is currently
- * not used.
- */
-static char *hex2mem(char *buf, char *mem, int count, int binary, int may_fault)
-{
-	int i;
-	unsigned char ch;
-
-	for (i=0; i<count; i++)
-	{
-		if (binary) {
-			ch = *buf++;
-			if (ch == 0x7d)
-				ch = 0x20 ^ *buf++;
-		}
-		else {
-			ch = hex(*buf++) << 4;
-			ch |= hex(*buf++);
-		}
-		if (kgdb_write_byte(ch, mem++) != 0)
-			return 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 MIPS R3xxx and R4xxx */
-	unsigned char signo;		/* Signal that we map this trap into */
-} hard_trap_info[] = {
-	{ 6, SIGBUS },			/* instruction bus error */
-	{ 7, SIGBUS },			/* data bus error */
-	{ 9, SIGTRAP },			/* break */
-	{ 10, SIGILL },			/* reserved instruction */
-/*	{ 11, SIGILL },		*/	/* CPU unusable */
-	{ 12, SIGFPE },			/* overflow */
-	{ 13, SIGTRAP },		/* trap */
-	{ 14, SIGSEGV },		/* virtual instruction cache coherency */
-	{ 15, SIGFPE },			/* floating point exception */
-	{ 23, SIGSEGV },		/* watch */
-	{ 31, SIGSEGV },		/* virtual data cache coherency */
-	{ 0, 0}				/* Must be last */
-};
-
-/* Save the normal trap handlers for user-mode traps. */
-void *saved_vectors[32];
-
-/*
- * Set up exception handlers for tracing and breakpoints
- */
-void set_debug_traps(void)
-{
-	struct hard_trap_info *ht;
-	unsigned long flags;
-	unsigned char c;
-
-	local_irq_save(flags);
-	for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
-		saved_vectors[ht->tt] = set_except_vector(ht->tt, trap_low);
-
-	putDebugChar('+'); /* 'hello world' */
-	/*
-	 * In case GDB is started before us, ack any packets
-	 * (presumably "$?#xx") sitting there.
-	 */
-	while((c = getDebugChar()) != '$');
-	while((c = getDebugChar()) != '#');
-	c = getDebugChar(); /* eat first csum byte */
-	c = getDebugChar(); /* eat second csum byte */
-	putDebugChar('+'); /* ack it */
-
-	initialized = 1;
-	local_irq_restore(flags);
-}
-
-void restore_debug_traps(void)
-{
-	struct hard_trap_info *ht;
-	unsigned long flags;
-
-	local_irq_save(flags);
-	for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
-		set_except_vector(ht->tt, saved_vectors[ht->tt]);
-	local_irq_restore(flags);
-}
-
-/*
- * Convert the MIPS 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);
-}
-
-static int hexToLong(char **ptr, long *longValue)
-{
-	int numChars = 0;
-	int hexValue;
-
-	*longValue = 0;
-
-	while (**ptr) {
-		hexValue = hex(**ptr);
-		if (hexValue < 0)
-			break;
-
-		*longValue = (*longValue << 4) | hexValue;
-		numChars ++;
-
-		(*ptr)++;
-	}
-
-	return numChars;
-}
-
-
-#if 0
-/*
- * Print registers (on target console)
- * Used only to debug the stub...
- */
-void show_gdbregs(struct gdb_regs * regs)
-{
-	/*
-	 * Saved main processor registers
-	 */
-	printk("$0 : %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
-	       regs->reg0, regs->reg1, regs->reg2, regs->reg3,
-	       regs->reg4, regs->reg5, regs->reg6, regs->reg7);
-	printk("$8 : %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
-	       regs->reg8, regs->reg9, regs->reg10, regs->reg11,
-	       regs->reg12, regs->reg13, regs->reg14, regs->reg15);
-	printk("$16: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
-	       regs->reg16, regs->reg17, regs->reg18, regs->reg19,
-	       regs->reg20, regs->reg21, regs->reg22, regs->reg23);
-	printk("$24: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
-	       regs->reg24, regs->reg25, regs->reg26, regs->reg27,
-	       regs->reg28, regs->reg29, regs->reg30, regs->reg31);
-
-	/*
-	 * Saved cp0 registers
-	 */
-	printk("epc  : %08lx\nStatus: %08lx\nCause : %08lx\n",
-	       regs->cp0_epc, regs->cp0_status, regs->cp0_cause);
-}
-#endif /* dead code */
-
-/*
- * We single-step by setting breakpoints. When an exception
- * is handled, we need to restore the instructions hoisted
- * when the breakpoints were set.
- *
- * This is where we save the original instructions.
- */
-static struct gdb_bp_save {
-	unsigned long addr;
-	unsigned int val;
-} step_bp[2];
-
-#define BP 0x0000000d  /* break opcode */
-
-/*
- * Set breakpoint instructions for single stepping.
- */
-static void single_step(struct gdb_regs *regs)
-{
-	union mips_instruction insn;
-	unsigned long targ;
-	int is_branch, is_cond, i;
-
-	targ = regs->cp0_epc;
-	insn.word = *(unsigned int *)targ;
-	is_branch = is_cond = 0;
-
-	switch (insn.i_format.opcode) {
-	/*
-	 * jr and jalr are in r_format format.
-	 */
-	case spec_op:
-		switch (insn.r_format.func) {
-		case jalr_op:
-		case jr_op:
-			targ = *(&regs->reg0 + insn.r_format.rs);
-			is_branch = 1;
-			break;
-		}
-		break;
-
-	/*
-	 * This group contains:
-	 * bltz_op, bgez_op, bltzl_op, bgezl_op,
-	 * bltzal_op, bgezal_op, bltzall_op, bgezall_op.
-	 */
-	case bcond_op:
-		is_branch = is_cond = 1;
-		targ += 4 + (insn.i_format.simmediate << 2);
-		break;
-
-	/*
-	 * These are unconditional and in j_format.
-	 */
-	case jal_op:
-	case j_op:
-		is_branch = 1;
-		targ += 4;
-		targ >>= 28;
-		targ <<= 28;
-		targ |= (insn.j_format.target << 2);
-		break;
-
-	/*
-	 * These are conditional.
-	 */
-	case beq_op:
-	case beql_op:
-	case bne_op:
-	case bnel_op:
-	case blez_op:
-	case blezl_op:
-	case bgtz_op:
-	case bgtzl_op:
-	case cop0_op:
-	case cop1_op:
-	case cop2_op:
-	case cop1x_op:
-		is_branch = is_cond = 1;
-		targ += 4 + (insn.i_format.simmediate << 2);
-		break;
-	}
-
-	if (is_branch) {
-		i = 0;
-		if (is_cond && targ != (regs->cp0_epc + 8)) {
-			step_bp[i].addr = regs->cp0_epc + 8;
-			step_bp[i++].val = *(unsigned *)(regs->cp0_epc + 8);
-			*(unsigned *)(regs->cp0_epc + 8) = BP;
-		}
-		step_bp[i].addr = targ;
-		step_bp[i].val  = *(unsigned *)targ;
-		*(unsigned *)targ = BP;
-	} else {
-		step_bp[0].addr = regs->cp0_epc + 4;
-		step_bp[0].val  = *(unsigned *)(regs->cp0_epc + 4);
-		*(unsigned *)(regs->cp0_epc + 4) = BP;
-	}
-}
-
-/*
- *  If asynchronously interrupted by gdb, then we need to set a breakpoint
- *  at the interrupted instruction so that we wind up stopped with a
- *  reasonable stack frame.
- */
-static struct gdb_bp_save async_bp;
-
-/*
- * Swap the interrupted EPC with our asynchronous breakpoint routine.
- * This is safer than stuffing the breakpoint in-place, since no cache
- * flushes (or resulting smp_call_functions) are required.  The
- * assumption is that only one CPU will be handling asynchronous bp's,
- * and only one can be active at a time.
- */
-extern spinlock_t smp_call_lock;
-
-void set_async_breakpoint(unsigned long *epc)
-{
-	/* skip breaking into userland */
-	if ((*epc & 0x80000000) == 0)
-		return;
-
-#ifdef CONFIG_SMP
-	/* avoid deadlock if someone is make IPC */
-	if (spin_is_locked(&smp_call_lock))
-		return;
-#endif
-
-	async_bp.addr = *epc;
-	*epc = (unsigned long)async_breakpoint;
-}
-
-#ifdef CONFIG_SMP
-static void kgdb_wait(void *arg)
-{
-	unsigned flags;
-	int cpu = smp_processor_id();
-
-	local_irq_save(flags);
-
-	__raw_spin_lock(&kgdb_cpulock[cpu]);
-	__raw_spin_unlock(&kgdb_cpulock[cpu]);
-
-	local_irq_restore(flags);
-}
-#endif
-
-/*
- * GDB stub needs to call kgdb_wait on all processor with interrupts
- * disabled, so it uses it's own special variant.
- */
-static int kgdb_smp_call_kgdb_wait(void)
-{
-#ifdef CONFIG_SMP
-	cpumask_t mask = cpu_online_map;
-	struct call_data_struct data;
-	int cpu = smp_processor_id();
-	int cpus;
-
-	/*
-	 * Can die spectacularly if this CPU isn't yet marked online
-	 */
-	BUG_ON(!cpu_online(cpu));
-
-	cpu_clear(cpu, mask);
-	cpus = cpus_weight(mask);
-	if (!cpus)
-		return 0;
-
-	if (spin_is_locked(&smp_call_lock)) {
-		/*
-		 * Some other processor is trying to make us do something
-		 * but we're not going to respond... give up
-		 */
-		return -1;
-		}
-
-	/*
-	 * We will continue here, accepting the fact that
-	 * the kernel may deadlock if another CPU attempts
-	 * to call smp_call_function now...
-	 */
-
-	data.func = kgdb_wait;
-	data.info = NULL;
-	atomic_set(&data.started, 0);
-	data.wait = 0;
-
-	spin_lock(&smp_call_lock);
-	call_data = &data;
-	mb();
-
-	core_send_ipi_mask(mask, SMP_CALL_FUNCTION);
-
-	/* Wait for response */
-	/* FIXME: lock-up detection, backtrace on lock-up */
-	while (atomic_read(&data.started) != cpus)
-		barrier();
-
-	call_data = NULL;
-	spin_unlock(&smp_call_lock);
-#endif
-
-	return 0;
-}
-
-/*
- * 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.
- */
-void handle_exception(struct gdb_regs *regs)
-{
-	int trap;			/* Trap type */
-	int sigval;
-	long addr;
-	int length;
-	char *ptr;
-	unsigned long *stack;
-	int i;
-	int bflag = 0;
-
-	kgdb_started = 1;
-
-	/*
-	 * acquire the big kgdb spinlock
-	 */
-	if (!spin_trylock(&kgdb_lock)) {
-		/*
-		 * some other CPU has the lock, we should go back to
-		 * receive the gdb_wait IPC
-		 */
-		return;
-	}
-
-	/*
-	 * If we're in async_breakpoint(), restore the real EPC from
-	 * the breakpoint.
-	 */
-	if (regs->cp0_epc == (unsigned long)async_breakinst) {
-		regs->cp0_epc = async_bp.addr;
-		async_bp.addr = 0;
-	}
-
-	/*
-	 * acquire the CPU spinlocks
-	 */
-	for_each_online_cpu(i)
-		if (__raw_spin_trylock(&kgdb_cpulock[i]) == 0)
-			panic("kgdb: couldn't get cpulock %d\n", i);
-
-	/*
-	 * force other cpus to enter kgdb
-	 */
-	kgdb_smp_call_kgdb_wait();
-
-	/*
-	 * If we're in breakpoint() increment the PC
-	 */
-	trap = (regs->cp0_cause & 0x7c) >> 2;
-	if (trap == 9 && regs->cp0_epc == (unsigned long)breakinst)
-		regs->cp0_epc += 4;
-
-	/*
-	 * If we were single_stepping, restore the opcodes hoisted
-	 * for the breakpoint[s].
-	 */
-	if (step_bp[0].addr) {
-		*(unsigned *)step_bp[0].addr = step_bp[0].val;
-		step_bp[0].addr = 0;
-
-		if (step_bp[1].addr) {
-			*(unsigned *)step_bp[1].addr = step_bp[1].val;
-			step_bp[1].addr = 0;
-		}
-	}
-
-	stack = (long *)regs->reg29;			/* stack ptr */
-	sigval = computeSignal(trap);
-
-	/*
-	 * reply to host that an exception has occurred
-	 */
-	ptr = output_buffer;
-
-	/*
-	 * Send trap type (converted to signal)
-	 */
-	*ptr++ = 'T';
-	*ptr++ = hexchars[sigval >> 4];
-	*ptr++ = hexchars[sigval & 0xf];
-
-	/*
-	 * Send Error PC
-	 */
-	*ptr++ = hexchars[REG_EPC >> 4];
-	*ptr++ = hexchars[REG_EPC & 0xf];
-	*ptr++ = ':';
-	ptr = mem2hex((char *)&regs->cp0_epc, ptr, sizeof(long), 0);
-	*ptr++ = ';';
-
-	/*
-	 * Send frame pointer
-	 */
-	*ptr++ = hexchars[REG_FP >> 4];
-	*ptr++ = hexchars[REG_FP & 0xf];
-	*ptr++ = ':';
-	ptr = mem2hex((char *)&regs->reg30, ptr, sizeof(long), 0);
-	*ptr++ = ';';
-
-	/*
-	 * Send stack pointer
-	 */
-	*ptr++ = hexchars[REG_SP >> 4];
-	*ptr++ = hexchars[REG_SP & 0xf];
-	*ptr++ = ':';
-	ptr = mem2hex((char *)&regs->reg29, ptr, sizeof(long), 0);
-	*ptr++ = ';';
-
-	*ptr++ = 0;
-	putpacket(output_buffer);	/* send it off... */
-
-	/*
-	 * Wait for input from remote GDB
-	 */
-	while (1) {
-		output_buffer[0] = 0;
-		getpacket(input_buffer);
-
-		switch (input_buffer[0])
-		{
-		case '?':
-			output_buffer[0] = 'S';
-			output_buffer[1] = hexchars[sigval >> 4];
-			output_buffer[2] = hexchars[sigval & 0xf];
-			output_buffer[3] = 0;
-			break;
-
-		/*
-		 * Detach debugger; let CPU run
-		 */
-		case 'D':
-			putpacket(output_buffer);
-			goto finish_kgdb;
-			break;
-
-		case 'd':
-			/* toggle debug flag */
-			break;
-
-		/*
-		 * Return the value of the CPU registers
-		 */
-		case 'g':
-			ptr = output_buffer;
-			ptr = mem2hex((char *)&regs->reg0, ptr, 32*sizeof(long), 0); /* r0...r31 */
-			ptr = mem2hex((char *)&regs->cp0_status, ptr, 6*sizeof(long), 0); /* cp0 */
-			ptr = mem2hex((char *)&regs->fpr0, ptr, 32*sizeof(long), 0); /* f0...31 */
-			ptr = mem2hex((char *)&regs->cp1_fsr, ptr, 2*sizeof(long), 0); /* cp1 */
-			ptr = mem2hex((char *)&regs->frame_ptr, ptr, 2*sizeof(long), 0); /* frp */
-			ptr = mem2hex((char *)&regs->cp0_index, ptr, 16*sizeof(long), 0); /* cp0 */
-			break;
-
-		/*
-		 * set the value of the CPU registers - return OK
-		 */
-		case 'G':
-		{
-			ptr = &input_buffer[1];
-			hex2mem(ptr, (char *)&regs->reg0, 32*sizeof(long), 0, 0);
-			ptr += 32*(2*sizeof(long));
-			hex2mem(ptr, (char *)&regs->cp0_status, 6*sizeof(long), 0, 0);
-			ptr += 6*(2*sizeof(long));
-			hex2mem(ptr, (char *)&regs->fpr0, 32*sizeof(long), 0, 0);
-			ptr += 32*(2*sizeof(long));
-			hex2mem(ptr, (char *)&regs->cp1_fsr, 2*sizeof(long), 0, 0);
-			ptr += 2*(2*sizeof(long));
-			hex2mem(ptr, (char *)&regs->frame_ptr, 2*sizeof(long), 0, 0);
-			ptr += 2*(2*sizeof(long));
-			hex2mem(ptr, (char *)&regs->cp0_index, 16*sizeof(long), 0, 0);
-			strcpy(output_buffer, "OK");
-		 }
-		break;
-
-		/*
-		 * mAA..AA,LLLL  Read LLLL bytes at address AA..AA
-		 */
-		case 'm':
-			ptr = &input_buffer[1];
-
-			if (hexToLong(&ptr, &addr)
-				&& *ptr++ == ','
-				&& hexToInt(&ptr, &length)) {
-				if (mem2hex((char *)addr, output_buffer, length, 1))
-					break;
-				strcpy(output_buffer, "E03");
-			} else
-				strcpy(output_buffer, "E01");
-			break;
-
-		/*
-		 * XAA..AA,LLLL: Write LLLL escaped binary bytes at address AA.AA
-		 */
-		case 'X':
-			bflag = 1;
-			/* fall through */
-
-		/*
-		 * MAA..AA,LLLL: Write LLLL bytes at address AA.AA return OK
-		 */
-		case 'M':
-			ptr = &input_buffer[1];
-
-			if (hexToLong(&ptr, &addr)
-				&& *ptr++ == ','
-				&& hexToInt(&ptr, &length)
-				&& *ptr++ == ':') {
-				if (hex2mem(ptr, (char *)addr, length, bflag, 1))
-					strcpy(output_buffer, "OK");
-				else
-					strcpy(output_buffer, "E03");
-			}
-			else
-				strcpy(output_buffer, "E02");
-			break;
-
-		/*
-		 * cAA..AA    Continue at address AA..AA(optional)
-		 */
-		case 'c':
-			/* try to read optional parameter, pc unchanged if no parm */
-
-			ptr = &input_buffer[1];
-			if (hexToLong(&ptr, &addr))
-				regs->cp0_epc = addr;
-
-			goto exit_kgdb_exception;
-			break;
-
-		/*
-		 * kill the program; let us try to restart the machine
-		 * Reset the whole machine.
-		 */
-		case 'k':
-		case 'r':
-			machine_restart("kgdb restarts machine");
-			break;
-
-		/*
-		 * Step to next instruction
-		 */
-		case 's':
-			/*
-			 * There is no single step insn in the MIPS ISA, so we
-			 * use breakpoints and continue, instead.
-			 */
-			single_step(regs);
-			goto exit_kgdb_exception;
-			/* NOTREACHED */
-			break;
-
-		/*
-		 * Set baud rate (bBB)
-		 * FIXME: Needs to be written
-		 */
-		case 'b':
-		{
-#if 0
-			int baudrate;
-			extern void set_timer_3();
-
-			ptr = &input_buffer[1];
-			if (!hexToInt(&ptr, &baudrate))
-			{
-				strcpy(output_buffer, "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:
-					baudrate = 0;
-					strcpy(output_buffer, "B02");
-					goto x1;
-			}
-
-			if (baudrate) {
-				putpacket("OK");	/* Ack before changing speed */
-				set_timer_3(baudrate); /* Set it */
-			}
-#endif
-		}
-		break;
-
-		}			/* switch */
-
-		/*
-		 * reply to the request
-		 */
-
-		putpacket(output_buffer);
-
-	} /* while */
-
-	return;
-
-finish_kgdb:
-	restore_debug_traps();
-
-exit_kgdb_exception:
-	/* release locks so other CPUs can go */
-	for_each_online_cpu(i)
-		__raw_spin_unlock(&kgdb_cpulock[i]);
-	spin_unlock(&kgdb_lock);
-
-	__flush_cache_all();
-	return;
-}
-
-/*
- * 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;
-
-	__asm__ __volatile__(
-			".globl	breakinst\n\t"
-			".set\tnoreorder\n\t"
-			"nop\n"
-			"breakinst:\tbreak\n\t"
-			"nop\n\t"
-			".set\treorder"
-			);
-}
-
-/* Nothing but the break; don't pollute any registers */
-void async_breakpoint(void)
-{
-	__asm__ __volatile__(
-			".globl	async_breakinst\n\t"
-			".set\tnoreorder\n\t"
-			"nop\n"
-			"async_breakinst:\tbreak\n\t"
-			"nop\n\t"
-			".set\treorder"
-			);
-}
-
-void adel(void)
-{
-	__asm__ __volatile__(
-			".globl\tadel\n\t"
-			"lui\t$8,0x8000\n\t"
-			"lw\t$9,1($8)\n\t"
-			);
-}
-
-/*
- * malloc is needed by gdb client in "call func()", even a private one
- * will make gdb happy
- */
-static void __used *malloc(size_t size)
-{
-	return kmalloc(size, GFP_ATOMIC);
-}
-
-static void __used free(void *where)
-{
-	kfree(where);
-}
-
-#ifdef CONFIG_GDB_CONSOLE
-
-void gdb_putsn(const char *str, int l)
-{
-	char outbuf[18];
-
-	if (!kgdb_started)
-		return;
-
-	outbuf[0]='O';
-
-	while(l) {
-		int i = (l>8)?8:l;
-		mem2hex((char *)str, &outbuf[1], i, 0);
-		outbuf[(i*2)+1]=0;
-		putpacket(outbuf);
-		str += i;
-		l -= i;
-	}
-}
-
-static void gdb_console_write(struct console *con, const char *s, unsigned n)
-{
-	gdb_putsn(s, n);
-}
-
-static struct console gdb_console = {
-	.name	= "gdb",
-	.write	= gdb_console_write,
-	.flags	= CON_PRINTBUFFER,
-	.index	= -1
-};
-
-static int __init register_gdb_console(void)
-{
-	register_console(&gdb_console);
-
-	return 0;
-}
-
-console_initcall(register_gdb_console);
-
-#endif