arch/blackfin/kernel/kgdb.c - linux - Git at Google

 /*
  * arch/blackfin/kernel/kgdb.c - Blackfin kgdb pieces
  *
  * Copyright 2005-2008 Analog Devices Inc.
  *
  * Licensed under the GPL-2 or later.
  */

 #include <linux/ptrace.h>		/* for linux pt_regs struct */
 #include <linux/kgdb.h>
 #include <linux/uaccess.h>

 void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
 {
 	gdb_regs[BFIN_R0] = regs->r0;
 	gdb_regs[BFIN_R1] = regs->r1;
 	gdb_regs[BFIN_R2] = regs->r2;
 	gdb_regs[BFIN_R3] = regs->r3;
 	gdb_regs[BFIN_R4] = regs->r4;
 	gdb_regs[BFIN_R5] = regs->r5;
 	gdb_regs[BFIN_R6] = regs->r6;
 	gdb_regs[BFIN_R7] = regs->r7;
 	gdb_regs[BFIN_P0] = regs->p0;
 	gdb_regs[BFIN_P1] = regs->p1;
 	gdb_regs[BFIN_P2] = regs->p2;
 	gdb_regs[BFIN_P3] = regs->p3;
 	gdb_regs[BFIN_P4] = regs->p4;
 	gdb_regs[BFIN_P5] = regs->p5;
 	gdb_regs[BFIN_SP] = regs->reserved;
 	gdb_regs[BFIN_FP] = regs->fp;
 	gdb_regs[BFIN_I0] = regs->i0;
 	gdb_regs[BFIN_I1] = regs->i1;
 	gdb_regs[BFIN_I2] = regs->i2;
 	gdb_regs[BFIN_I3] = regs->i3;
 	gdb_regs[BFIN_M0] = regs->m0;
 	gdb_regs[BFIN_M1] = regs->m1;
 	gdb_regs[BFIN_M2] = regs->m2;
 	gdb_regs[BFIN_M3] = regs->m3;
 	gdb_regs[BFIN_B0] = regs->b0;
 	gdb_regs[BFIN_B1] = regs->b1;
 	gdb_regs[BFIN_B2] = regs->b2;
 	gdb_regs[BFIN_B3] = regs->b3;
 	gdb_regs[BFIN_L0] = regs->l0;
 	gdb_regs[BFIN_L1] = regs->l1;
 	gdb_regs[BFIN_L2] = regs->l2;
 	gdb_regs[BFIN_L3] = regs->l3;
 	gdb_regs[BFIN_A0_DOT_X] = regs->a0x;
 	gdb_regs[BFIN_A0_DOT_W] = regs->a0w;
 	gdb_regs[BFIN_A1_DOT_X] = regs->a1x;
 	gdb_regs[BFIN_A1_DOT_W] = regs->a1w;
 	gdb_regs[BFIN_ASTAT] = regs->astat;
 	gdb_regs[BFIN_RETS] = regs->rets;
 	gdb_regs[BFIN_LC0] = regs->lc0;
 	gdb_regs[BFIN_LT0] = regs->lt0;
 	gdb_regs[BFIN_LB0] = regs->lb0;
 	gdb_regs[BFIN_LC1] = regs->lc1;
 	gdb_regs[BFIN_LT1] = regs->lt1;
 	gdb_regs[BFIN_LB1] = regs->lb1;
 	gdb_regs[BFIN_CYCLES] = 0;
 	gdb_regs[BFIN_CYCLES2] = 0;
 	gdb_regs[BFIN_USP] = regs->usp;
 	gdb_regs[BFIN_SEQSTAT] = regs->seqstat;
 	gdb_regs[BFIN_SYSCFG] = regs->syscfg;
 	gdb_regs[BFIN_RETI] = regs->pc;
 	gdb_regs[BFIN_RETX] = regs->retx;
 	gdb_regs[BFIN_RETN] = regs->retn;
 	gdb_regs[BFIN_RETE] = regs->rete;
 	gdb_regs[BFIN_PC] = regs->pc;
 	gdb_regs[BFIN_CC] = (regs->astat >> 5) & 1;
 	gdb_regs[BFIN_EXTRA1] = 0;
 	gdb_regs[BFIN_EXTRA2] = 0;
 	gdb_regs[BFIN_EXTRA3] = 0;
 	gdb_regs[BFIN_IPEND] = regs->ipend;
 }

 /*
  * Extracts ebp, esp and eip values understandable by gdb from the values
  * saved by switch_to.
  * thread.esp points to ebp. flags and ebp are pushed in switch_to hence esp
  * prior to entering switch_to is 8 greater than the value that is saved.
  * If switch_to changes, change following code appropriately.
  */
 void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
 {
 	gdb_regs[BFIN_SP] = p->thread.ksp;
 	gdb_regs[BFIN_PC] = p->thread.pc;
 	gdb_regs[BFIN_SEQSTAT] = p->thread.seqstat;
 }

 void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs)
 {
 	regs->r0 = gdb_regs[BFIN_R0];
 	regs->r1 = gdb_regs[BFIN_R1];
 	regs->r2 = gdb_regs[BFIN_R2];
 	regs->r3 = gdb_regs[BFIN_R3];
 	regs->r4 = gdb_regs[BFIN_R4];
 	regs->r5 = gdb_regs[BFIN_R5];
 	regs->r6 = gdb_regs[BFIN_R6];
 	regs->r7 = gdb_regs[BFIN_R7];
 	regs->p0 = gdb_regs[BFIN_P0];
 	regs->p1 = gdb_regs[BFIN_P1];
 	regs->p2 = gdb_regs[BFIN_P2];
 	regs->p3 = gdb_regs[BFIN_P3];
 	regs->p4 = gdb_regs[BFIN_P4];
 	regs->p5 = gdb_regs[BFIN_P5];
 	regs->fp = gdb_regs[BFIN_FP];
 	regs->i0 = gdb_regs[BFIN_I0];
 	regs->i1 = gdb_regs[BFIN_I1];
 	regs->i2 = gdb_regs[BFIN_I2];
 	regs->i3 = gdb_regs[BFIN_I3];
 	regs->m0 = gdb_regs[BFIN_M0];
 	regs->m1 = gdb_regs[BFIN_M1];
 	regs->m2 = gdb_regs[BFIN_M2];
 	regs->m3 = gdb_regs[BFIN_M3];
 	regs->b0 = gdb_regs[BFIN_B0];
 	regs->b1 = gdb_regs[BFIN_B1];
 	regs->b2 = gdb_regs[BFIN_B2];
 	regs->b3 = gdb_regs[BFIN_B3];
 	regs->l0 = gdb_regs[BFIN_L0];
 	regs->l1 = gdb_regs[BFIN_L1];
 	regs->l2 = gdb_regs[BFIN_L2];
 	regs->l3 = gdb_regs[BFIN_L3];
 	regs->a0x = gdb_regs[BFIN_A0_DOT_X];
 	regs->a0w = gdb_regs[BFIN_A0_DOT_W];
 	regs->a1x = gdb_regs[BFIN_A1_DOT_X];
 	regs->a1w = gdb_regs[BFIN_A1_DOT_W];
 	regs->rets = gdb_regs[BFIN_RETS];
 	regs->lc0 = gdb_regs[BFIN_LC0];
 	regs->lt0 = gdb_regs[BFIN_LT0];
 	regs->lb0 = gdb_regs[BFIN_LB0];
 	regs->lc1 = gdb_regs[BFIN_LC1];
 	regs->lt1 = gdb_regs[BFIN_LT1];
 	regs->lb1 = gdb_regs[BFIN_LB1];
 	regs->usp = gdb_regs[BFIN_USP];
 	regs->syscfg = gdb_regs[BFIN_SYSCFG];
 	regs->retx = gdb_regs[BFIN_RETX];
 	regs->retn = gdb_regs[BFIN_RETN];
 	regs->rete = gdb_regs[BFIN_RETE];
 	regs->pc = gdb_regs[BFIN_PC];

 #if 0				/* can't change these */
 	regs->astat = gdb_regs[BFIN_ASTAT];
 	regs->seqstat = gdb_regs[BFIN_SEQSTAT];
 	regs->ipend = gdb_regs[BFIN_IPEND];
 #endif
 }

 static struct hw_breakpoint {
 	unsigned int occupied:1;
 	unsigned int skip:1;
 	unsigned int enabled:1;
 	unsigned int type:1;
 	unsigned int dataacc:2;
 	unsigned short count;
 	unsigned int addr;
 } breakinfo[HW_WATCHPOINT_NUM];

 static int bfin_set_hw_break(unsigned long addr, int len, enum kgdb_bptype type)
 {
 	int breakno;
 	int bfin_type;
 	int dataacc = 0;

 	switch (type) {
 	case BP_HARDWARE_BREAKPOINT:
 		bfin_type = TYPE_INST_WATCHPOINT;
 		break;
 	case BP_WRITE_WATCHPOINT:
 		dataacc = 1;
 		bfin_type = TYPE_DATA_WATCHPOINT;
 		break;
 	case BP_READ_WATCHPOINT:
 		dataacc = 2;
 		bfin_type = TYPE_DATA_WATCHPOINT;
 		break;
 	case BP_ACCESS_WATCHPOINT:
 		dataacc = 3;
 		bfin_type = TYPE_DATA_WATCHPOINT;
 		break;
 	default:
 		return -ENOSPC;
 	}

 	/* Becasue hardware data watchpoint impelemented in current
 	 * Blackfin can not trigger an exception event as the hardware
 	 * instrction watchpoint does, we ignaore all data watch point here.
 	 * They can be turned on easily after future blackfin design
 	 * supports this feature.
 	 */
 	for (breakno = 0; breakno < HW_INST_WATCHPOINT_NUM; breakno++)
 		if (bfin_type == breakinfo[breakno].type
 			&& !breakinfo[breakno].occupied) {
 			breakinfo[breakno].occupied = 1;
 			breakinfo[breakno].skip = 0;
 			breakinfo[breakno].enabled = 1;
 			breakinfo[breakno].addr = addr;
 			breakinfo[breakno].dataacc = dataacc;
 			breakinfo[breakno].count = 0;
 			return 0;
 		}

 	return -ENOSPC;
 }

 static int bfin_remove_hw_break(unsigned long addr, int len, enum kgdb_bptype type)
 {
 	int breakno;
 	int bfin_type;

 	switch (type) {
 	case BP_HARDWARE_BREAKPOINT:
 		bfin_type = TYPE_INST_WATCHPOINT;
 		break;
 	case BP_WRITE_WATCHPOINT:
 	case BP_READ_WATCHPOINT:
 	case BP_ACCESS_WATCHPOINT:
 		bfin_type = TYPE_DATA_WATCHPOINT;
 		break;
 	default:
 		return 0;
 	}
 	for (breakno = 0; breakno < HW_WATCHPOINT_NUM; breakno++)
 		if (bfin_type == breakinfo[breakno].type
 			&& breakinfo[breakno].occupied
 			&& breakinfo[breakno].addr == addr) {
 			breakinfo[breakno].occupied = 0;
 			breakinfo[breakno].enabled = 0;
 		}

 	return 0;
 }

 static void bfin_remove_all_hw_break(void)
 {
 	int breakno;

 	memset(breakinfo, 0, sizeof(struct hw_breakpoint)*HW_WATCHPOINT_NUM);

 	for (breakno = 0; breakno < HW_INST_WATCHPOINT_NUM; breakno++)
 		breakinfo[breakno].type = TYPE_INST_WATCHPOINT;
 	for (; breakno < HW_WATCHPOINT_NUM; breakno++)
 		breakinfo[breakno].type = TYPE_DATA_WATCHPOINT;
 }

 static void bfin_correct_hw_break(void)
 {
 	int breakno;
 	unsigned int wpiactl = 0;
 	unsigned int wpdactl = 0;
 	int enable_wp = 0;

 	for (breakno = 0; breakno < HW_WATCHPOINT_NUM; breakno++)
 		if (breakinfo[breakno].enabled) {
 			enable_wp = 1;

 			switch (breakno) {
 			case 0:
 				wpiactl |= WPIAEN0|WPICNTEN0;
 				bfin_write_WPIA0(breakinfo[breakno].addr);
 				bfin_write_WPIACNT0(breakinfo[breakno].count
 					+ breakinfo->skip);
 				break;
 			case 1:
 				wpiactl |= WPIAEN1|WPICNTEN1;
 				bfin_write_WPIA1(breakinfo[breakno].addr);
 				bfin_write_WPIACNT1(breakinfo[breakno].count
 					+ breakinfo->skip);
 				break;
 			case 2:
 				wpiactl |= WPIAEN2|WPICNTEN2;
 				bfin_write_WPIA2(breakinfo[breakno].addr);
 				bfin_write_WPIACNT2(breakinfo[breakno].count
 					+ breakinfo->skip);
 				break;
 			case 3:
 				wpiactl |= WPIAEN3|WPICNTEN3;
 				bfin_write_WPIA3(breakinfo[breakno].addr);
 				bfin_write_WPIACNT3(breakinfo[breakno].count
 					+ breakinfo->skip);
 				break;
 			case 4:
 				wpiactl |= WPIAEN4|WPICNTEN4;
 				bfin_write_WPIA4(breakinfo[breakno].addr);
 				bfin_write_WPIACNT4(breakinfo[breakno].count
 					+ breakinfo->skip);
 				break;
 			case 5:
 				wpiactl |= WPIAEN5|WPICNTEN5;
 				bfin_write_WPIA5(breakinfo[breakno].addr);
 				bfin_write_WPIACNT5(breakinfo[breakno].count
 					+ breakinfo->skip);
 				break;
 			case 6:
 				wpdactl |= WPDAEN0|WPDCNTEN0|WPDSRC0;
 				wpdactl |= breakinfo[breakno].dataacc
 					<< WPDACC0_OFFSET;
 				bfin_write_WPDA0(breakinfo[breakno].addr);
 				bfin_write_WPDACNT0(breakinfo[breakno].count
 					+ breakinfo->skip);
 				break;
 			case 7:
 				wpdactl |= WPDAEN1|WPDCNTEN1|WPDSRC1;
 				wpdactl |= breakinfo[breakno].dataacc
 					<< WPDACC1_OFFSET;
 				bfin_write_WPDA1(breakinfo[breakno].addr);
 				bfin_write_WPDACNT1(breakinfo[breakno].count
 					+ breakinfo->skip);
 				break;
 			}
 		}

 	/* Should enable WPPWR bit first before set any other
 	 * WPIACTL and WPDACTL bits */
 	if (enable_wp) {
 		bfin_write_WPIACTL(WPPWR);
 		CSYNC();
 		bfin_write_WPIACTL(wpiactl|WPPWR);
 		bfin_write_WPDACTL(wpdactl);
 		CSYNC();
 	}
 }

 static void bfin_disable_hw_debug(struct pt_regs *regs)
 {
 	/* Disable hardware debugging while we are in kgdb */
 	bfin_write_WPIACTL(0);
 	bfin_write_WPDACTL(0);
 	CSYNC();
 }

 #ifdef CONFIG_SMP
 void kgdb_passive_cpu_callback(void *info)
 {
 	kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs());
 }

 void kgdb_roundup_cpus(unsigned long flags)
 {
 	smp_call_function(kgdb_passive_cpu_callback, NULL, 0);
 }

 void kgdb_roundup_cpu(int cpu, unsigned long flags)
 {
 	smp_call_function_single(cpu, kgdb_passive_cpu_callback, NULL, 0);
 }
 #endif

 int kgdb_arch_handle_exception(int vector, int signo,
 			       int err_code, char *remcom_in_buffer,
 			       char *remcom_out_buffer,
 			       struct pt_regs *regs)
 {
 	long addr;
 	char *ptr;
 	int newPC;
 	int i;

 	switch (remcom_in_buffer[0]) {
 	case 'c':
 	case 's':
 		if (kgdb_contthread && kgdb_contthread != current) {
 			strcpy(remcom_out_buffer, "E00");
 			break;
 		}

 		kgdb_contthread = NULL;

 		/* try to read optional parameter, pc unchanged if no parm */
 		ptr = &remcom_in_buffer[1];
 		if (kgdb_hex2long(&ptr, &addr)) {
 			regs->retx = addr;
 		}
 		newPC = regs->retx;

 		/* clear the trace bit */
 		regs->syscfg &= 0xfffffffe;

 		/* set the trace bit if we're stepping */
 		if (remcom_in_buffer[0] == 's') {
 			regs->syscfg |= 0x1;
 			kgdb_single_step = regs->ipend;
 			kgdb_single_step >>= 6;
 			for (i = 10; i > 0; i--, kgdb_single_step >>= 1)
 				if (kgdb_single_step & 1)
 					break;
 			/* i indicate event priority of current stopped instruction
 			 * user space instruction is 0, IVG15 is 1, IVTMR is 10.
 			 * kgdb_single_step > 0 means in single step mode
 			 */
 			kgdb_single_step = i + 1;
 		}

 		bfin_correct_hw_break();

 		return 0;
 	}			/* switch */
 	return -1;		/* this means that we do not want to exit from the handler */
 }

 struct kgdb_arch arch_kgdb_ops = {
 	.gdb_bpt_instr = {0xa1},
 #ifdef CONFIG_SMP
 	.flags = KGDB_HW_BREAKPOINT|KGDB_THR_PROC_SWAP,
 #else
 	.flags = KGDB_HW_BREAKPOINT,
 #endif
 	.set_hw_breakpoint = bfin_set_hw_break,
 	.remove_hw_breakpoint = bfin_remove_hw_break,
 	.disable_hw_break = bfin_disable_hw_debug,
 	.remove_all_hw_break = bfin_remove_all_hw_break,
 	.correct_hw_break = bfin_correct_hw_break,
 };

 #define IN_MEM(addr, size, l1_addr, l1_size) \
 ({ \
 	unsigned long __addr = (unsigned long)(addr); \
 	(l1_size && __addr >= l1_addr && __addr + (size) <= l1_addr + l1_size); \
 })
 #define ASYNC_BANK_SIZE \
 	(ASYNC_BANK0_SIZE + ASYNC_BANK1_SIZE + \
 	 ASYNC_BANK2_SIZE + ASYNC_BANK3_SIZE)

 int kgdb_validate_break_address(unsigned long addr)
 {
 	int cpu = raw_smp_processor_id();

 	if (addr >= 0x1000 && (addr + BREAK_INSTR_SIZE) <= physical_mem_end)
 		return 0;
 	if (IN_MEM(addr, BREAK_INSTR_SIZE, ASYNC_BANK0_BASE, ASYNC_BANK_SIZE))
 		return 0;
 	if (cpu == 0 && IN_MEM(addr, BREAK_INSTR_SIZE, L1_CODE_START, L1_CODE_LENGTH))
 		return 0;
 #ifdef CONFIG_SMP
 	else if (cpu == 1 && IN_MEM(addr, BREAK_INSTR_SIZE, COREB_L1_CODE_START, L1_CODE_LENGTH))
 		return 0;
 #endif
 	if (IN_MEM(addr, BREAK_INSTR_SIZE, L2_START, L2_LENGTH))
 		return 0;

 	return -EFAULT;
 }

 void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
 {
 	regs->retx = ip;
 }

 int kgdb_arch_init(void)
 {
 	kgdb_single_step = 0;

 	bfin_remove_all_hw_break();
 	return 0;
 }

 void kgdb_arch_exit(void)
 {
 }
	/*
	* arch/blackfin/kernel/kgdb.c - Blackfin kgdb pieces
	*
	* Copyright 2005-2008 Analog Devices Inc.
	*
	* Licensed under the GPL-2 or later.
	*/

	#include <linux/ptrace.h> /* for linux pt_regs struct */
	#include <linux/kgdb.h>
	#include <linux/uaccess.h>

	void pt_regs_to_gdb_regs(unsigned long gdb_regs, struct pt_regs regs)
	{
	gdb_regs[BFIN_R0] = regs->r0;
	gdb_regs[BFIN_R1] = regs->r1;
	gdb_regs[BFIN_R2] = regs->r2;
	gdb_regs[BFIN_R3] = regs->r3;
	gdb_regs[BFIN_R4] = regs->r4;
	gdb_regs[BFIN_R5] = regs->r5;
	gdb_regs[BFIN_R6] = regs->r6;
	gdb_regs[BFIN_R7] = regs->r7;
	gdb_regs[BFIN_P0] = regs->p0;
	gdb_regs[BFIN_P1] = regs->p1;
	gdb_regs[BFIN_P2] = regs->p2;
	gdb_regs[BFIN_P3] = regs->p3;
	gdb_regs[BFIN_P4] = regs->p4;
	gdb_regs[BFIN_P5] = regs->p5;
	gdb_regs[BFIN_SP] = regs->reserved;
	gdb_regs[BFIN_FP] = regs->fp;
	gdb_regs[BFIN_I0] = regs->i0;
	gdb_regs[BFIN_I1] = regs->i1;
	gdb_regs[BFIN_I2] = regs->i2;
	gdb_regs[BFIN_I3] = regs->i3;
	gdb_regs[BFIN_M0] = regs->m0;
	gdb_regs[BFIN_M1] = regs->m1;
	gdb_regs[BFIN_M2] = regs->m2;
	gdb_regs[BFIN_M3] = regs->m3;
	gdb_regs[BFIN_B0] = regs->b0;
	gdb_regs[BFIN_B1] = regs->b1;
	gdb_regs[BFIN_B2] = regs->b2;
	gdb_regs[BFIN_B3] = regs->b3;
	gdb_regs[BFIN_L0] = regs->l0;
	gdb_regs[BFIN_L1] = regs->l1;
	gdb_regs[BFIN_L2] = regs->l2;
	gdb_regs[BFIN_L3] = regs->l3;
	gdb_regs[BFIN_A0_DOT_X] = regs->a0x;
	gdb_regs[BFIN_A0_DOT_W] = regs->a0w;
	gdb_regs[BFIN_A1_DOT_X] = regs->a1x;
	gdb_regs[BFIN_A1_DOT_W] = regs->a1w;
	gdb_regs[BFIN_ASTAT] = regs->astat;
	gdb_regs[BFIN_RETS] = regs->rets;
	gdb_regs[BFIN_LC0] = regs->lc0;
	gdb_regs[BFIN_LT0] = regs->lt0;
	gdb_regs[BFIN_LB0] = regs->lb0;
	gdb_regs[BFIN_LC1] = regs->lc1;
	gdb_regs[BFIN_LT1] = regs->lt1;
	gdb_regs[BFIN_LB1] = regs->lb1;
	gdb_regs[BFIN_CYCLES] = 0;
	gdb_regs[BFIN_CYCLES2] = 0;
	gdb_regs[BFIN_USP] = regs->usp;
	gdb_regs[BFIN_SEQSTAT] = regs->seqstat;
	gdb_regs[BFIN_SYSCFG] = regs->syscfg;
	gdb_regs[BFIN_RETI] = regs->pc;
	gdb_regs[BFIN_RETX] = regs->retx;
	gdb_regs[BFIN_RETN] = regs->retn;
	gdb_regs[BFIN_RETE] = regs->rete;
	gdb_regs[BFIN_PC] = regs->pc;
	gdb_regs[BFIN_CC] = (regs->astat >> 5) & 1;
	gdb_regs[BFIN_EXTRA1] = 0;
	gdb_regs[BFIN_EXTRA2] = 0;
	gdb_regs[BFIN_EXTRA3] = 0;
	gdb_regs[BFIN_IPEND] = regs->ipend;
	}

	/*
	* Extracts ebp, esp and eip values understandable by gdb from the values
	* saved by switch_to.
	* thread.esp points to ebp. flags and ebp are pushed in switch_to hence esp
	* prior to entering switch_to is 8 greater than the value that is saved.
	* If switch_to changes, change following code appropriately.
	*/
	void sleeping_thread_to_gdb_regs(unsigned long gdb_regs, struct task_struct p)
	{
	gdb_regs[BFIN_SP] = p->thread.ksp;
	gdb_regs[BFIN_PC] = p->thread.pc;
	gdb_regs[BFIN_SEQSTAT] = p->thread.seqstat;
	}

	void gdb_regs_to_pt_regs(unsigned long gdb_regs, struct pt_regs regs)
	{
	regs->r0 = gdb_regs[BFIN_R0];
	regs->r1 = gdb_regs[BFIN_R1];
	regs->r2 = gdb_regs[BFIN_R2];
	regs->r3 = gdb_regs[BFIN_R3];
	regs->r4 = gdb_regs[BFIN_R4];
	regs->r5 = gdb_regs[BFIN_R5];
	regs->r6 = gdb_regs[BFIN_R6];
	regs->r7 = gdb_regs[BFIN_R7];
	regs->p0 = gdb_regs[BFIN_P0];
	regs->p1 = gdb_regs[BFIN_P1];
	regs->p2 = gdb_regs[BFIN_P2];
	regs->p3 = gdb_regs[BFIN_P3];
	regs->p4 = gdb_regs[BFIN_P4];
	regs->p5 = gdb_regs[BFIN_P5];
	regs->fp = gdb_regs[BFIN_FP];
	regs->i0 = gdb_regs[BFIN_I0];
	regs->i1 = gdb_regs[BFIN_I1];
	regs->i2 = gdb_regs[BFIN_I2];
	regs->i3 = gdb_regs[BFIN_I3];
	regs->m0 = gdb_regs[BFIN_M0];
	regs->m1 = gdb_regs[BFIN_M1];
	regs->m2 = gdb_regs[BFIN_M2];
	regs->m3 = gdb_regs[BFIN_M3];
	regs->b0 = gdb_regs[BFIN_B0];
	regs->b1 = gdb_regs[BFIN_B1];
	regs->b2 = gdb_regs[BFIN_B2];
	regs->b3 = gdb_regs[BFIN_B3];
	regs->l0 = gdb_regs[BFIN_L0];
	regs->l1 = gdb_regs[BFIN_L1];
	regs->l2 = gdb_regs[BFIN_L2];
	regs->l3 = gdb_regs[BFIN_L3];
	regs->a0x = gdb_regs[BFIN_A0_DOT_X];
	regs->a0w = gdb_regs[BFIN_A0_DOT_W];
	regs->a1x = gdb_regs[BFIN_A1_DOT_X];
	regs->a1w = gdb_regs[BFIN_A1_DOT_W];
	regs->rets = gdb_regs[BFIN_RETS];
	regs->lc0 = gdb_regs[BFIN_LC0];
	regs->lt0 = gdb_regs[BFIN_LT0];
	regs->lb0 = gdb_regs[BFIN_LB0];
	regs->lc1 = gdb_regs[BFIN_LC1];
	regs->lt1 = gdb_regs[BFIN_LT1];
	regs->lb1 = gdb_regs[BFIN_LB1];
	regs->usp = gdb_regs[BFIN_USP];
	regs->syscfg = gdb_regs[BFIN_SYSCFG];
	regs->retx = gdb_regs[BFIN_RETX];
	regs->retn = gdb_regs[BFIN_RETN];
	regs->rete = gdb_regs[BFIN_RETE];
	regs->pc = gdb_regs[BFIN_PC];

	#if 0 /* can't change these */
	regs->astat = gdb_regs[BFIN_ASTAT];
	regs->seqstat = gdb_regs[BFIN_SEQSTAT];
	regs->ipend = gdb_regs[BFIN_IPEND];
	#endif
	}

	static struct hw_breakpoint {
	unsigned int occupied:1;
	unsigned int skip:1;
	unsigned int enabled:1;
	unsigned int type:1;
	unsigned int dataacc:2;
	unsigned short count;
	unsigned int addr;
	} breakinfo[HW_WATCHPOINT_NUM];

	static int bfin_set_hw_break(unsigned long addr, int len, enum kgdb_bptype type)
	{
	int breakno;
	int bfin_type;
	int dataacc = 0;

	switch (type) {
	case BP_HARDWARE_BREAKPOINT:
	bfin_type = TYPE_INST_WATCHPOINT;
	break;
	case BP_WRITE_WATCHPOINT:
	dataacc = 1;
	bfin_type = TYPE_DATA_WATCHPOINT;
	break;
	case BP_READ_WATCHPOINT:
	dataacc = 2;
	bfin_type = TYPE_DATA_WATCHPOINT;
	break;
	case BP_ACCESS_WATCHPOINT:
	dataacc = 3;
	bfin_type = TYPE_DATA_WATCHPOINT;
	break;
	default:
	return -ENOSPC;
	}

	/* Becasue hardware data watchpoint impelemented in current
	* Blackfin can not trigger an exception event as the hardware
	* instrction watchpoint does, we ignaore all data watch point here.
	* They can be turned on easily after future blackfin design
	* supports this feature.
	*/
	for (breakno = 0; breakno < HW_INST_WATCHPOINT_NUM; breakno++)
	if (bfin_type == breakinfo[breakno].type
	&& !breakinfo[breakno].occupied) {
	breakinfo[breakno].occupied = 1;
	breakinfo[breakno].skip = 0;
	breakinfo[breakno].enabled = 1;
	breakinfo[breakno].addr = addr;
	breakinfo[breakno].dataacc = dataacc;
	breakinfo[breakno].count = 0;
	return 0;
	}

	return -ENOSPC;
	}

	static int bfin_remove_hw_break(unsigned long addr, int len, enum kgdb_bptype type)
	{
	int breakno;
	int bfin_type;

	switch (type) {
	case BP_HARDWARE_BREAKPOINT:
	bfin_type = TYPE_INST_WATCHPOINT;
	break;
	case BP_WRITE_WATCHPOINT:
	case BP_READ_WATCHPOINT:
	case BP_ACCESS_WATCHPOINT:
	bfin_type = TYPE_DATA_WATCHPOINT;
	break;
	default:
	return 0;
	}
	for (breakno = 0; breakno < HW_WATCHPOINT_NUM; breakno++)
	if (bfin_type == breakinfo[breakno].type
	&& breakinfo[breakno].occupied
	&& breakinfo[breakno].addr == addr) {
	breakinfo[breakno].occupied = 0;
	breakinfo[breakno].enabled = 0;
	}

	return 0;
	}

	static void bfin_remove_all_hw_break(void)
	{
	int breakno;

	memset(breakinfo, 0, sizeof(struct hw_breakpoint)*HW_WATCHPOINT_NUM);

	for (breakno = 0; breakno < HW_INST_WATCHPOINT_NUM; breakno++)
	breakinfo[breakno].type = TYPE_INST_WATCHPOINT;
	for (; breakno < HW_WATCHPOINT_NUM; breakno++)
	breakinfo[breakno].type = TYPE_DATA_WATCHPOINT;
	}

	static void bfin_correct_hw_break(void)
	{
	int breakno;
	unsigned int wpiactl = 0;
	unsigned int wpdactl = 0;
	int enable_wp = 0;

	for (breakno = 0; breakno < HW_WATCHPOINT_NUM; breakno++)
	if (breakinfo[breakno].enabled) {
	enable_wp = 1;

	switch (breakno) {
	case 0:
	wpiactl \|= WPIAEN0\|WPICNTEN0;
	bfin_write_WPIA0(breakinfo[breakno].addr);
	bfin_write_WPIACNT0(breakinfo[breakno].count
	+ breakinfo->skip);
	break;
	case 1:
	wpiactl \|= WPIAEN1\|WPICNTEN1;
	bfin_write_WPIA1(breakinfo[breakno].addr);
	bfin_write_WPIACNT1(breakinfo[breakno].count
	+ breakinfo->skip);
	break;
	case 2:
	wpiactl \|= WPIAEN2\|WPICNTEN2;
	bfin_write_WPIA2(breakinfo[breakno].addr);
	bfin_write_WPIACNT2(breakinfo[breakno].count
	+ breakinfo->skip);
	break;
	case 3:
	wpiactl \|= WPIAEN3\|WPICNTEN3;
	bfin_write_WPIA3(breakinfo[breakno].addr);
	bfin_write_WPIACNT3(breakinfo[breakno].count
	+ breakinfo->skip);
	break;
	case 4:
	wpiactl \|= WPIAEN4\|WPICNTEN4;
	bfin_write_WPIA4(breakinfo[breakno].addr);
	bfin_write_WPIACNT4(breakinfo[breakno].count
	+ breakinfo->skip);
	break;
	case 5:
	wpiactl \|= WPIAEN5\|WPICNTEN5;
	bfin_write_WPIA5(breakinfo[breakno].addr);
	bfin_write_WPIACNT5(breakinfo[breakno].count
	+ breakinfo->skip);
	break;
	case 6:
	wpdactl \|= WPDAEN0\|WPDCNTEN0\|WPDSRC0;
	wpdactl \|= breakinfo[breakno].dataacc
	<< WPDACC0_OFFSET;
	bfin_write_WPDA0(breakinfo[breakno].addr);
	bfin_write_WPDACNT0(breakinfo[breakno].count
	+ breakinfo->skip);
	break;
	case 7:
	wpdactl \|= WPDAEN1\|WPDCNTEN1\|WPDSRC1;
	wpdactl \|= breakinfo[breakno].dataacc
	<< WPDACC1_OFFSET;
	bfin_write_WPDA1(breakinfo[breakno].addr);
	bfin_write_WPDACNT1(breakinfo[breakno].count
	+ breakinfo->skip);
	break;
	}
	}

	/* Should enable WPPWR bit first before set any other
	* WPIACTL and WPDACTL bits */
	if (enable_wp) {
	bfin_write_WPIACTL(WPPWR);
	CSYNC();
	bfin_write_WPIACTL(wpiactl\|WPPWR);
	bfin_write_WPDACTL(wpdactl);
	CSYNC();
	}
	}

	static void bfin_disable_hw_debug(struct pt_regs *regs)
	{
	/* Disable hardware debugging while we are in kgdb */
	bfin_write_WPIACTL(0);
	bfin_write_WPDACTL(0);
	CSYNC();
	}

	#ifdef CONFIG_SMP
	void kgdb_passive_cpu_callback(void *info)
	{
	kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs());
	}

	void kgdb_roundup_cpus(unsigned long flags)
	{
	smp_call_function(kgdb_passive_cpu_callback, NULL, 0);
	}

	void kgdb_roundup_cpu(int cpu, unsigned long flags)
	{
	smp_call_function_single(cpu, kgdb_passive_cpu_callback, NULL, 0);
	}
	#endif

	int kgdb_arch_handle_exception(int vector, int signo,
	int err_code, char *remcom_in_buffer,
	char *remcom_out_buffer,
	struct pt_regs *regs)
	{
	long addr;
	char *ptr;
	int newPC;
	int i;

	switch (remcom_in_buffer[0]) {
	case 'c':
	case 's':
	if (kgdb_contthread && kgdb_contthread != current) {
	strcpy(remcom_out_buffer, "E00");
	break;
	}

	kgdb_contthread = NULL;

	/* try to read optional parameter, pc unchanged if no parm */
	ptr = &remcom_in_buffer[1];
	if (kgdb_hex2long(&ptr, &addr)) {
	regs->retx = addr;
	}
	newPC = regs->retx;

	/* clear the trace bit */
	regs->syscfg &= 0xfffffffe;

	/* set the trace bit if we're stepping */
	if (remcom_in_buffer[0] == 's') {
	regs->syscfg \|= 0x1;
	kgdb_single_step = regs->ipend;
	kgdb_single_step >>= 6;
	for (i = 10; i > 0; i--, kgdb_single_step >>= 1)
	if (kgdb_single_step & 1)
	break;
	/* i indicate event priority of current stopped instruction
	* user space instruction is 0, IVG15 is 1, IVTMR is 10.
	* kgdb_single_step > 0 means in single step mode
	*/
	kgdb_single_step = i + 1;
	}

	bfin_correct_hw_break();

	return 0;
	} /* switch */
	return -1; /* this means that we do not want to exit from the handler */
	}

	struct kgdb_arch arch_kgdb_ops = {
	.gdb_bpt_instr = {0xa1},
	#ifdef CONFIG_SMP
	.flags = KGDB_HW_BREAKPOINT\|KGDB_THR_PROC_SWAP,
	#else
	.flags = KGDB_HW_BREAKPOINT,
	#endif
	.set_hw_breakpoint = bfin_set_hw_break,
	.remove_hw_breakpoint = bfin_remove_hw_break,
	.disable_hw_break = bfin_disable_hw_debug,
	.remove_all_hw_break = bfin_remove_all_hw_break,
	.correct_hw_break = bfin_correct_hw_break,
	};

	#define IN_MEM(addr, size, l1_addr, l1_size) \
	({ \
	unsigned long __addr = (unsigned long)(addr); \
	(l1_size && __addr >= l1_addr && __addr + (size) <= l1_addr + l1_size); \
	})
	#define ASYNC_BANK_SIZE \
	(ASYNC_BANK0_SIZE + ASYNC_BANK1_SIZE + \
	ASYNC_BANK2_SIZE + ASYNC_BANK3_SIZE)

	int kgdb_validate_break_address(unsigned long addr)
	{
	int cpu = raw_smp_processor_id();

	if (addr >= 0x1000 && (addr + BREAK_INSTR_SIZE) <= physical_mem_end)
	return 0;
	if (IN_MEM(addr, BREAK_INSTR_SIZE, ASYNC_BANK0_BASE, ASYNC_BANK_SIZE))
	return 0;
	if (cpu == 0 && IN_MEM(addr, BREAK_INSTR_SIZE, L1_CODE_START, L1_CODE_LENGTH))
	return 0;
	#ifdef CONFIG_SMP
	else if (cpu == 1 && IN_MEM(addr, BREAK_INSTR_SIZE, COREB_L1_CODE_START, L1_CODE_LENGTH))
	return 0;
	#endif
	if (IN_MEM(addr, BREAK_INSTR_SIZE, L2_START, L2_LENGTH))
	return 0;

	return -EFAULT;
	}

	void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
	{
	regs->retx = ip;
	}

	int kgdb_arch_init(void)
	{
	kgdb_single_step = 0;

	bfin_remove_all_hw_break();
	return 0;
	}

	void kgdb_arch_exit(void)
	{
	}