Blackfin arch: add supporting for kgdb

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

2 files changed, 569 insertions, 177 deletions

diff --git a/arch/blackfin/kernel/kgdb.c b/arch/blackfin/kernel/kgdb.c
index a1f9641a642..b795a207742 100644
--- a/arch/blackfin/kernel/kgdb.c
+++ b/arch/blackfin/kernel/kgdb.c
@@ -1,32 +1,9 @@
 /*
- * File:         arch/blackfin/kernel/kgdb.c
- * Based on:
- * Author:       Sonic Zhang
+ * arch/blackfin/kernel/kgdb.c - Blackfin kgdb pieces
  *
- * Created:
- * Description:
+ * Copyright 2005-2008 Analog Devices Inc.
  *
- * Rev:          $Id: kgdb_bfin_linux-2.6.x.patch 4934 2007-02-13 09:32:11Z sonicz $
- *
- * Modified:
- *               Copyright 2005-2006 Analog Devices Inc.
- *
- * Bugs:         Enter bugs at http://blackfin.uclinux.org/
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see the file COPYING, or write
- * to the Free Software Foundation, Inc.,
- * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ * Licensed under the GPL-2 or later.
  */
 
 #include <linux/string.h>
@@ -39,24 +16,29 @@
 #include <linux/kgdb.h>
 #include <linux/console.h>
 #include <linux/init.h>
-#include <linux/debugger.h>
 #include <linux/errno.h>
 #include <linux/irq.h>
+#include <linux/uaccess.h>
 #include <asm/system.h>
 #include <asm/traps.h>
 #include <asm/blackfin.h>
+#include <asm/dma.h>
 
 /* Put the error code here just in case the user cares.  */
-int gdb_bf533errcode;
+int gdb_bfin_errcode;
 /* Likewise, the vector number here (since GDB only gets the signal
    number through the usual means, and that's not very specific).  */
-int gdb_bf533vector = -1;
+int gdb_bfin_vector = -1;
 
 #if KGDB_MAX_NO_CPUS != 8
 #error change the definition of slavecpulocks
 #endif
 
-void regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+#ifdef CONFIG_BFIN_WDT
+# error "Please unselect blackfin watchdog driver before build KGDB."
+#endif
+
+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;
@@ -133,7 +115,7 @@ void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
 	gdb_regs[BFIN_SEQSTAT] = p->thread.seqstat;
 }
 
-void gdb_regs_to_regs(unsigned long *gdb_regs, struct pt_regs *regs)
+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];
@@ -199,171 +181,208 @@ struct hw_breakpoint {
 	unsigned int dataacc:2;
 	unsigned short count;
 	unsigned int addr;
-} breakinfo[HW_BREAKPOINT_NUM];
+} breakinfo[HW_WATCHPOINT_NUM];
 
-int kgdb_arch_init(void)
-{
-	debugger_step = 0;
-
-	kgdb_remove_all_hw_break();
-	return 0;
-}
-
-int kgdb_set_hw_break(unsigned long addr)
+int bfin_set_hw_break(unsigned long addr, int len, enum kgdb_bptype type)
 {
 	int breakno;
-	for (breakno = 0; breakno < HW_BREAKPOINT_NUM; breakno++)
-		if (!breakinfo[breakno].occupied) {
+	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].enabled = 1;
-			breakinfo[breakno].type = 1;
 			breakinfo[breakno].addr = addr;
+			breakinfo[breakno].dataacc = dataacc;
+			breakinfo[breakno].count = 0;
 			return 0;
 		}
 
 	return -ENOSPC;
 }
 
-int kgdb_remove_hw_break(unsigned long addr)
+int bfin_remove_hw_break(unsigned long addr, int len, enum kgdb_bptype type)
 {
 	int breakno;
-	for (breakno = 0; breakno < HW_BREAKPOINT_NUM; breakno++)
-		if (breakinfo[breakno].addr == addr)
-			memset(&(breakinfo[breakno]), 0, sizeof(struct hw_breakpoint));
+	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;
 }
 
-void kgdb_remove_all_hw_break(void)
+void bfin_remove_all_hw_break(void)
 {
-	memset(breakinfo, 0, sizeof(struct hw_breakpoint)*8);
-}
+	int breakno;
 
-/*
-void kgdb_show_info(void)
-{
-	printk(KERN_DEBUG "hwd: wpia0=0x%x, wpiacnt0=%d, wpiactl=0x%x, wpstat=0x%x\n",
-		bfin_read_WPIA0(), bfin_read_WPIACNT0(),
-		bfin_read_WPIACTL(), bfin_read_WPSTAT());
+	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;
 }
-*/
 
-void kgdb_correct_hw_break(void)
+void bfin_correct_hw_break(void)
 {
 	int breakno;
-	int correctit;
-	uint32_t wpdactl = bfin_read_WPDACTL();
+	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;
 
-	correctit = 0;
-	for (breakno = 0; breakno < HW_BREAKPOINT_NUM; breakno++) {
-		if (breakinfo[breakno].type == 1) {
 			switch (breakno) {
 			case 0:
-				if (breakinfo[breakno].enabled && !(wpdactl & WPIAEN0)) {
-					correctit = 1;
-					wpdactl &= ~(WPIREN01|EMUSW0);
-					wpdactl |= WPIAEN0|WPICNTEN0;
-					bfin_write_WPIA0(breakinfo[breakno].addr);
-					bfin_write_WPIACNT0(breakinfo[breakno].skip);
-				} else if (!breakinfo[breakno].enabled && (wpdactl & WPIAEN0)) {
-					correctit = 1;
-					wpdactl &= ~WPIAEN0;
-				}
+				wpiactl |= WPIAEN0|WPICNTEN0;
+				bfin_write_WPIA0(breakinfo[breakno].addr);
+				bfin_write_WPIACNT0(breakinfo[breakno].count
+					+ breakinfo->skip);
 				break;
-
 			case 1:
-				if (breakinfo[breakno].enabled && !(wpdactl & WPIAEN1)) {
-					correctit = 1;
-					wpdactl &= ~(WPIREN01|EMUSW1);
-					wpdactl |= WPIAEN1|WPICNTEN1;
-					bfin_write_WPIA1(breakinfo[breakno].addr);
-					bfin_write_WPIACNT1(breakinfo[breakno].skip);
-				} else if (!breakinfo[breakno].enabled && (wpdactl & WPIAEN1)) {
-					correctit = 1;
-					wpdactl &= ~WPIAEN1;
-				}
+				wpiactl |= WPIAEN1|WPICNTEN1;
+				bfin_write_WPIA1(breakinfo[breakno].addr);
+				bfin_write_WPIACNT1(breakinfo[breakno].count
+					+ breakinfo->skip);
 				break;
-
 			case 2:
-				if (breakinfo[breakno].enabled && !(wpdactl & WPIAEN2)) {
-					correctit = 1;
-					wpdactl &= ~(WPIREN23|EMUSW2);
-					wpdactl |= WPIAEN2|WPICNTEN2;
-					bfin_write_WPIA2(breakinfo[breakno].addr);
-					bfin_write_WPIACNT2(breakinfo[breakno].skip);
-				} else if (!breakinfo[breakno].enabled && (wpdactl & WPIAEN2)) {
-					correctit = 1;
-					wpdactl &= ~WPIAEN2;
-				}
+				wpiactl |= WPIAEN2|WPICNTEN2;
+				bfin_write_WPIA2(breakinfo[breakno].addr);
+				bfin_write_WPIACNT2(breakinfo[breakno].count
+					+ breakinfo->skip);
 				break;
-
 			case 3:
-				if (breakinfo[breakno].enabled && !(wpdactl & WPIAEN3)) {
-					correctit = 1;
-					wpdactl &= ~(WPIREN23|EMUSW3);
-					wpdactl |= WPIAEN3|WPICNTEN3;
-					bfin_write_WPIA3(breakinfo[breakno].addr);
-					bfin_write_WPIACNT3(breakinfo[breakno].skip);
-				} else if (!breakinfo[breakno].enabled && (wpdactl & WPIAEN3)) {
-					correctit = 1;
-					wpdactl &= ~WPIAEN3;
-				}
+				wpiactl |= WPIAEN3|WPICNTEN3;
+				bfin_write_WPIA3(breakinfo[breakno].addr);
+				bfin_write_WPIACNT3(breakinfo[breakno].count
+					+ breakinfo->skip);
 				break;
 			case 4:
-				if (breakinfo[breakno].enabled && !(wpdactl & WPIAEN4)) {
-					correctit = 1;
-					wpdactl &= ~(WPIREN45|EMUSW4);
-					wpdactl |= WPIAEN4|WPICNTEN4;
-					bfin_write_WPIA4(breakinfo[breakno].addr);
-					bfin_write_WPIACNT4(breakinfo[breakno].skip);
-				} else if (!breakinfo[breakno].enabled && (wpdactl & WPIAEN4)) {
-					correctit = 1;
-					wpdactl &= ~WPIAEN4;
-				}
+				wpiactl |= WPIAEN4|WPICNTEN4;
+				bfin_write_WPIA4(breakinfo[breakno].addr);
+				bfin_write_WPIACNT4(breakinfo[breakno].count
+					+ breakinfo->skip);
 				break;
 			case 5:
-				if (breakinfo[breakno].enabled && !(wpdactl & WPIAEN5)) {
-					correctit = 1;
-					wpdactl &= ~(WPIREN45|EMUSW5);
-					wpdactl |= WPIAEN5|WPICNTEN5;
-					bfin_write_WPIA5(breakinfo[breakno].addr);
-					bfin_write_WPIACNT5(breakinfo[breakno].skip);
-				} else if (!breakinfo[breakno].enabled && (wpdactl & WPIAEN5)) {
-					correctit = 1;
-					wpdactl &= ~WPIAEN5;
-				}
+				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;
 			}
 		}
-	}
-	if (correctit) {
-		wpdactl &= ~WPAND;
-		wpdactl |= WPPWR;
-		/*printk("correct_hw_break: wpdactl=0x%x\n", wpdactl);*/
+
+	/* 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();
-		/*kgdb_show_info();*/
 	}
 }
 
 void kgdb_disable_hw_debug(struct pt_regs *regs)
 {
 	/* Disable hardware debugging while we are in kgdb */
-	bfin_write_WPIACTL(bfin_read_WPIACTL() & ~0x1);
+	bfin_write_WPIACTL(0);
+	bfin_write_WPDACTL(0);
 	CSYNC();
 }
 
-void kgdb_post_master_code(struct pt_regs *regs, int eVector, int err_code)
+#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, 0);
+}
+
+void kgdb_roundup_cpu(int cpu, unsigned long flags)
+{
+	smp_call_function_single(cpu, kgdb_passive_cpu_callback, NULL, 0, 0);
+}
+#endif
+
+void kgdb_post_primary_code(struct pt_regs *regs, int eVector, int err_code)
 {
 	/* Master processor is completely in the debugger */
-	gdb_bf533vector = eVector;
-	gdb_bf533errcode = err_code;
+	gdb_bfin_vector = eVector;
+	gdb_bfin_errcode = err_code;
 }
 
-int kgdb_arch_handle_exception(int exceptionVector, int signo,
+int kgdb_arch_handle_exception(int vector, int signo,
 			       int err_code, char *remcom_in_buffer,
 			       char *remcom_out_buffer,
-			       struct pt_regs *linux_regs)
+			       struct pt_regs *regs)
 {
 	long addr;
 	long breakno;
@@ -385,44 +404,40 @@ int kgdb_arch_handle_exception(int exceptionVector, int signo,
 		/* try to read optional parameter, pc unchanged if no parm */
 		ptr = &remcom_in_buffer[1];
 		if (kgdb_hex2long(&ptr, &addr)) {
-			linux_regs->retx = addr;
+			regs->retx = addr;
 		}
-		newPC = linux_regs->retx;
+		newPC = regs->retx;
 
 		/* clear the trace bit */
-		linux_regs->syscfg &= 0xfffffffe;
+		regs->syscfg &= 0xfffffffe;
 
 		/* set the trace bit if we're stepping */
 		if (remcom_in_buffer[0] == 's') {
-			linux_regs->syscfg |= 0x1;
-			debugger_step = linux_regs->ipend;
-			debugger_step >>= 6;
-			for (i = 10; i > 0; i--, debugger_step >>= 1)
-				if (debugger_step & 1)
+			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.
-			 * debugger_step > 0 means in single step mode
+			 * kgdb_single_step > 0 means in single step mode
 			 */
-			debugger_step = i + 1;
-		} else {
-			debugger_step = 0;
+			kgdb_single_step = i + 1;
 		}
 
-		wp_status = bfin_read_WPSTAT();
-		CSYNC();
-
-		if (exceptionVector == VEC_WATCH) {
-			for (breakno = 0; breakno < 6; ++breakno) {
+		if (vector == VEC_WATCH) {
+			wp_status = bfin_read_WPSTAT();
+			for (breakno = 0; breakno < HW_WATCHPOINT_NUM; breakno++) {
 				if (wp_status & (1 << breakno)) {
 					breakinfo->skip = 1;
 					break;
 				}
 			}
+			bfin_write_WPSTAT(0);
 		}
-		kgdb_correct_hw_break();
 
-		bfin_write_WPSTAT(0);
+		bfin_correct_hw_break();
 
 		return 0;
 	}			/* switch */
@@ -431,5 +446,385 @@ int kgdb_arch_handle_exception(int exceptionVector, int signo,
 
 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,
+	.remove_all_hw_break = bfin_remove_all_hw_break,
+	.correct_hw_break = bfin_correct_hw_break,
 };
+
+static int hex(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;
+}
+
+static int validate_memory_access_address(unsigned long addr, int size)
+{
+	int cpu = raw_smp_processor_id();
+
+	if (size < 0)
+		return EFAULT;
+	if (addr >= 0x1000 && (addr + size) <= physical_mem_end)
+		return 0;
+	if (addr >= SYSMMR_BASE)
+		return 0;
+	if (addr >= ASYNC_BANK0_BASE
+	   && addr + size <= ASYNC_BANK3_BASE + ASYNC_BANK3_SIZE)
+		return 0;
+	if (cpu == 0) {
+		if (addr >= L1_SCRATCH_START
+		   && (addr + size <= L1_SCRATCH_START + L1_SCRATCH_LENGTH))
+			return 0;
+#if L1_CODE_LENGTH != 0
+		if (addr >= L1_CODE_START
+		   && (addr + size <= L1_CODE_START + L1_CODE_LENGTH))
+			return 0;
+#endif
+#if L1_DATA_A_LENGTH != 0
+		if (addr >= L1_DATA_A_START
+		   && (addr + size <= L1_DATA_A_START + L1_DATA_A_LENGTH))
+			return 0;
+#endif
+#if L1_DATA_B_LENGTH != 0
+		if (addr >= L1_DATA_B_START
+		   && (addr + size <= L1_DATA_B_START + L1_DATA_B_LENGTH))
+			return 0;
+#endif
+#ifdef CONFIG_SMP
+	} else if (cpu == 1) {
+		if (addr >= COREB_L1_SCRATCH_START
+		   && (addr + size <= COREB_L1_SCRATCH_START
+		   + L1_SCRATCH_LENGTH))
+			return 0;
+# if L1_CODE_LENGTH != 0
+		if (addr >= COREB_L1_CODE_START
+		   && (addr + size <= COREB_L1_CODE_START + L1_CODE_LENGTH))
+			return 0;
+# endif
+# if L1_DATA_A_LENGTH != 0
+		if (addr >= COREB_L1_DATA_A_START
+		   && (addr + size <= COREB_L1_DATA_A_START + L1_DATA_A_LENGTH))
+			return 0;
+# endif
+# if L1_DATA_B_LENGTH != 0
+		if (addr >= COREB_L1_DATA_B_START
+		   && (addr + size <= COREB_L1_DATA_B_START + L1_DATA_B_LENGTH))
+			return 0;
+# endif
+#endif
+	}
+
+#if L2_LENGTH != 0
+	if (addr >= L2_START
+	   && addr + size <= L2_START + L2_LENGTH)
+		return 0;
+#endif
+
+	return EFAULT;
+}
+
+/*
+ * Convert the memory pointed to by mem into hex, placing result in buf.
+ * Return a pointer to the last char put in buf (null). May return an error.
+ */
+int kgdb_mem2hex(char *mem, char *buf, int count)
+{
+	char *tmp;
+	int err = 0;
+	unsigned char *pch;
+	unsigned short mmr16;
+	unsigned long mmr32;
+	int cpu = raw_smp_processor_id();
+
+	if (validate_memory_access_address((unsigned long)mem, count))
+		return EFAULT;
+
+	/*
+	 * We use the upper half of buf as an intermediate buffer for the
+	 * raw memory copy.  Hex conversion will work against this one.
+	 */
+	tmp = buf + count;
+
+	if ((unsigned int)mem >= SYSMMR_BASE) { /*access MMR registers*/
+		switch (count) {
+		case 2:
+			if ((unsigned int)mem % 2 == 0) {
+				mmr16 = *(unsigned short *)mem;
+				pch = (unsigned char *)&mmr16;
+				*tmp++ = *pch++;
+				*tmp++ = *pch++;
+				tmp -= 2;
+			} else
+				err = EFAULT;
+			break;
+		case 4:
+			if ((unsigned int)mem % 4 == 0) {
+				mmr32 = *(unsigned long *)mem;
+				pch = (unsigned char *)&mmr32;
+				*tmp++ = *pch++;
+				*tmp++ = *pch++;
+				*tmp++ = *pch++;
+				*tmp++ = *pch++;
+				tmp -= 4;
+			} else
+				err = EFAULT;
+			break;
+		default:
+			err = EFAULT;
+		}
+	} else if (cpu == 0 && (unsigned int)mem >= L1_CODE_START &&
+		(unsigned int)(mem + count) <= L1_CODE_START + L1_CODE_LENGTH
+#ifdef CONFIG_SMP
+		|| cpu == 1 && (unsigned int)mem >= COREB_L1_CODE_START &&
+		(unsigned int)(mem + count) <=
+		COREB_L1_CODE_START + L1_CODE_LENGTH
+#endif
+		) {
+		/* access L1 instruction SRAM*/
+		if (dma_memcpy(tmp, mem, count) == NULL)
+			err = EFAULT;
+	} else
+		err = probe_kernel_read(tmp, mem, count);
+
+	if (!err) {
+		while (count > 0) {
+			buf = pack_hex_byte(buf, *tmp);
+			tmp++;
+			count--;
+		}
+
+		*buf = 0;
+	}
+
+	return err;
+}
+
+/*
+ * Copy the binary array pointed to by buf into mem.  Fix $, #, and
+ * 0x7d escaped with 0x7d.  Return a pointer to the character after
+ * the last byte written.
+ */
+int kgdb_ebin2mem(char *buf, char *mem, int count)
+{
+	char *tmp_old;
+	char *tmp_new;
+	unsigned short *mmr16;
+	unsigned long *mmr32;
+	int err = 0;
+	int size = 0;
+	int cpu = raw_smp_processor_id();
+
+	tmp_old = tmp_new = buf;
+
+	while (count-- > 0) {
+		if (*tmp_old == 0x7d)
+			*tmp_new = *(++tmp_old) ^ 0x20;
+		else
+			*tmp_new = *tmp_old;
+		tmp_new++;
+		tmp_old++;
+		size++;
+	}
+
+	if (validate_memory_access_address((unsigned long)mem, size))
+		return EFAULT;
+
+	if ((unsigned int)mem >= SYSMMR_BASE) { /*access MMR registers*/
+		switch (size) {
+		case 2:
+			if ((unsigned int)mem % 2 == 0) {
+				mmr16 = (unsigned short *)buf;
+				*(unsigned short *)mem = *mmr16;
+			} else
+				return EFAULT;
+			break;
+		case 4:
+			if ((unsigned int)mem % 4 == 0) {
+				mmr32 = (unsigned long *)buf;
+				*(unsigned long *)mem = *mmr32;
+			} else
+				return EFAULT;
+			break;
+		default:
+			return EFAULT;
+		}
+	} else if (cpu == 0 && (unsigned int)mem >= L1_CODE_START &&
+		(unsigned int)(mem + count) < L1_CODE_START + L1_CODE_LENGTH
+#ifdef CONFIG_SMP
+		|| cpu == 1 && (unsigned int)mem >= COREB_L1_CODE_START &&
+		(unsigned int)(mem + count) <=
+		COREB_L1_CODE_START + L1_CODE_LENGTH
+#endif
+		) {
+		/* access L1 instruction SRAM */
+		if (dma_memcpy(mem, buf, size) == NULL)
+			err = EFAULT;
+	} else
+		err = probe_kernel_write(mem, buf, size);
+
+	return err;
+}
+
+/*
+ * 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 return an error.
+ */
+int kgdb_hex2mem(char *buf, char *mem, int count)
+{
+	char *tmp_raw;
+	char *tmp_hex;
+	unsigned short *mmr16;
+	unsigned long *mmr32;
+	int cpu = raw_smp_processor_id();
+
+	if (validate_memory_access_address((unsigned long)mem, count))
+		return EFAULT;
+
+	/*
+	 * We use the upper half of buf as an intermediate buffer for the
+	 * raw memory that is converted from hex.
+	 */
+	tmp_raw = buf + count * 2;
+
+	tmp_hex = tmp_raw - 1;
+	while (tmp_hex >= buf) {
+		tmp_raw--;
+		*tmp_raw = hex(*tmp_hex--);
+		*tmp_raw |= hex(*tmp_hex--) << 4;
+	}
+
+	if ((unsigned int)mem >= SYSMMR_BASE) { /*access MMR registers*/
+		switch (count) {
+		case 2:
+			if ((unsigned int)mem % 2 == 0) {
+				mmr16 = (unsigned short *)tmp_raw;
+				*(unsigned short *)mem = *mmr16;
+			} else
+				return EFAULT;
+			break;
+		case 4:
+			if ((unsigned int)mem % 4 == 0) {
+				mmr32 = (unsigned long *)tmp_raw;
+				*(unsigned long *)mem = *mmr32;
+			} else
+				return EFAULT;
+			break;
+		default:
+			return EFAULT;
+		}
+	} else if (cpu == 0 && (unsigned int)mem >= L1_CODE_START &&
+		(unsigned int)(mem + count) <= L1_CODE_START + L1_CODE_LENGTH
+#ifdef CONFIG_SMP
+		|| cpu == 1 && (unsigned int)mem >= COREB_L1_CODE_START &&
+		(unsigned int)(mem + count) <=
+		COREB_L1_CODE_START + L1_CODE_LENGTH
+#endif
+		) {
+		/* access L1 instruction SRAM */
+		if (dma_memcpy(mem, tmp_raw, count) == NULL)
+			return EFAULT;
+	} else
+		return probe_kernel_write(mem, tmp_raw, count);
+	return 0;
+}
+
+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 (addr >= ASYNC_BANK0_BASE
+	   && addr + BREAK_INSTR_SIZE <= ASYNC_BANK3_BASE + ASYNC_BANK3_BASE)
+		return 0;
+#if L1_CODE_LENGTH != 0
+	if (cpu == 0 && addr >= L1_CODE_START
+	   && addr + BREAK_INSTR_SIZE <= L1_CODE_START + L1_CODE_LENGTH)
+		return 0;
+# ifdef CONFIG_SMP
+	else if (cpu == 1 && addr >= COREB_L1_CODE_START
+	   && addr + BREAK_INSTR_SIZE <= COREB_L1_CODE_START + L1_CODE_LENGTH)
+		return 0;
+# endif
+#endif
+#if L2_LENGTH != 0
+	if (addr >= L2_START
+	   && addr + BREAK_INSTR_SIZE <= L2_START + L2_LENGTH)
+		return 0;
+#endif
+
+	return EFAULT;
+}
+
+int kgdb_arch_set_breakpoint(unsigned long addr, char *saved_instr)
+{
+	int err;
+	int cpu = raw_smp_processor_id();
+
+	if ((cpu == 0 && (unsigned int)addr >= L1_CODE_START
+		&& (unsigned int)(addr + BREAK_INSTR_SIZE)
+		< L1_CODE_START + L1_CODE_LENGTH)
+#ifdef CONFIG_SMP
+		|| (cpu == 1 && (unsigned int)addr >= COREB_L1_CODE_START
+		&& (unsigned int)(addr + BREAK_INSTR_SIZE)
+		< COREB_L1_CODE_START + L1_CODE_LENGTH)
+#endif
+		) {
+		/* access L1 instruction SRAM */
+		if (dma_memcpy(saved_instr, (void *)addr, BREAK_INSTR_SIZE)
+			== NULL)
+			return -EFAULT;
+
+		if (dma_memcpy((void *)addr, arch_kgdb_ops.gdb_bpt_instr,
+			BREAK_INSTR_SIZE) == NULL)
+			return -EFAULT;
+
+		return 0;
+	} else {
+		err = probe_kernel_read(saved_instr, (char *)addr,
+			BREAK_INSTR_SIZE);
+		if (err)
+			return err;
+
+		return probe_kernel_write((char *)addr,
+			arch_kgdb_ops.gdb_bpt_instr, BREAK_INSTR_SIZE);
+	}
+}
+
+int kgdb_arch_remove_breakpoint(unsigned long addr, char *bundle)
+{
+	if ((unsigned int)addr >= L1_CODE_START &&
+		(unsigned int)(addr + BREAK_INSTR_SIZE) <
+			L1_CODE_START + L1_CODE_LENGTH) {
+		/* access L1 instruction SRAM */
+		if (dma_memcpy((void *)addr, bundle, BREAK_INSTR_SIZE) == NULL)
+			return -EFAULT;
+
+		return 0;
+	} else
+		return probe_kernel_write((char *)addr,
+				(char *)bundle, BREAK_INSTR_SIZE);
+}
+
+int kgdb_arch_init(void)
+{
+	kgdb_single_step = 0;
+
+	bfin_remove_all_hw_break();
+	return 0;
+}
+
+void kgdb_arch_exit(void)
+{
+}
diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c
index bd41fca315d..8d561baef89 100644
--- a/arch/blackfin/kernel/traps.c
+++ b/arch/blackfin/kernel/traps.c
@@ -43,12 +43,11 @@
 #include <asm/dma.h>
 
 #ifdef CONFIG_KGDB
-# include <linux/debugger.h>
 # include <linux/kgdb.h>
 
 # define CHK_DEBUGGER_TRAP() \
 	do { \
-		CHK_DEBUGGER(trapnr, sig, info.si_code, fp, ); \
+		kgdb_handle_exception(trapnr, sig, info.si_code, fp); \
 	} while (0)
 # define CHK_DEBUGGER_TRAP_MAYBE() \
 	do { \
@@ -300,7 +299,7 @@ asmlinkage void trap_c(struct pt_regs *fp)
 		info.si_code = SEGV_STACKFLOW;
 		sig = SIGSEGV;
 		printk(KERN_NOTICE EXC_0x03(KERN_NOTICE));
-		CHK_DEBUGGER_TRAP();
+		CHK_DEBUGGER_TRAP_MAYBE();
 		break;
 	/* 0x04 - User Defined, Caught by default */
 	/* 0x05 - User Defined, Caught by default */
@@ -329,7 +328,7 @@ asmlinkage void trap_c(struct pt_regs *fp)
 		info.si_code = TRAP_TRACEFLOW;
 		sig = SIGTRAP;
 		printk(KERN_NOTICE EXC_0x11(KERN_NOTICE));
-		CHK_DEBUGGER_TRAP();
+		CHK_DEBUGGER_TRAP_MAYBE();
 		break;
 	/* 0x12 - Reserved, Caught by default */
 	/* 0x13 - Reserved, Caught by default */
@@ -351,35 +350,35 @@ asmlinkage void trap_c(struct pt_regs *fp)
 		info.si_code = ILL_ILLOPC;
 		sig = SIGILL;
 		printk(KERN_NOTICE EXC_0x21(KERN_NOTICE));
-		CHK_DEBUGGER_TRAP();
+		CHK_DEBUGGER_TRAP_MAYBE();
 		break;
 	/* 0x22 - Illegal Instruction Combination, handled here */
 	case VEC_ILGAL_I:
 		info.si_code = ILL_ILLPARAOP;
 		sig = SIGILL;
 		printk(KERN_NOTICE EXC_0x22(KERN_NOTICE));
-		CHK_DEBUGGER_TRAP();
+		CHK_DEBUGGER_TRAP_MAYBE();
 		break;
 	/* 0x23 - Data CPLB protection violation, handled here */
 	case VEC_CPLB_VL:
 		info.si_code = ILL_CPLB_VI;
 		sig = SIGBUS;
 		printk(KERN_NOTICE EXC_0x23(KERN_NOTICE));
-		CHK_DEBUGGER_TRAP();
+		CHK_DEBUGGER_TRAP_MAYBE();
 		break;
 	/* 0x24 - Data access misaligned, handled here */
 	case VEC_MISALI_D:
 		info.si_code = BUS_ADRALN;
 		sig = SIGBUS;
 		printk(KERN_NOTICE EXC_0x24(KERN_NOTICE));
-		CHK_DEBUGGER_TRAP();
+		CHK_DEBUGGER_TRAP_MAYBE();
 		break;
 	/* 0x25 - Unrecoverable Event, handled here */
 	case VEC_UNCOV:
 		info.si_code = ILL_ILLEXCPT;
 		sig = SIGILL;
 		printk(KERN_NOTICE EXC_0x25(KERN_NOTICE));
-		CHK_DEBUGGER_TRAP();
+		CHK_DEBUGGER_TRAP_MAYBE();
 		break;
 	/* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 		error case is handled here */
@@ -387,7 +386,6 @@ asmlinkage void trap_c(struct pt_regs *fp)
 		info.si_code = BUS_ADRALN;
 		sig = SIGBUS;
 		printk(KERN_NOTICE EXC_0x26(KERN_NOTICE));
-		CHK_DEBUGGER_TRAP();
 		break;
 	/* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 	case VEC_CPLB_MHIT:
@@ -399,7 +397,7 @@ asmlinkage void trap_c(struct pt_regs *fp)
 		else
 #endif
 			printk(KERN_NOTICE EXC_0x27(KERN_NOTICE));
-		CHK_DEBUGGER_TRAP();
+		CHK_DEBUGGER_TRAP_MAYBE();
 		break;
 	/* 0x28 - Emulation Watchpoint, handled here */
 	case VEC_WATCH:
@@ -418,7 +416,7 @@ asmlinkage void trap_c(struct pt_regs *fp)
 		info.si_code = BUS_OPFETCH;
 		sig = SIGBUS;
 		printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
-		CHK_DEBUGGER_TRAP();
+		CHK_DEBUGGER_TRAP_MAYBE();
 		break;
 #else
 	/* 0x29 - Reserved, Caught by default */
@@ -428,21 +426,20 @@ asmlinkage void trap_c(struct pt_regs *fp)
 		info.si_code = BUS_ADRALN;
 		sig = SIGBUS;
 		printk(KERN_NOTICE EXC_0x2A(KERN_NOTICE));
-		CHK_DEBUGGER_TRAP();
+		CHK_DEBUGGER_TRAP_MAYBE();
 		break;
 	/* 0x2B - Instruction CPLB protection violation, handled here */
 	case VEC_CPLB_I_VL:
 		info.si_code = ILL_CPLB_VI;
 		sig = SIGBUS;
 		printk(KERN_NOTICE EXC_0x2B(KERN_NOTICE));
-		CHK_DEBUGGER_TRAP();
+		CHK_DEBUGGER_TRAP_MAYBE();
 		break;
 	/* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 	case VEC_CPLB_I_M:
 		info.si_code = ILL_CPLB_MISS;
 		sig = SIGBUS;
 		printk(KERN_NOTICE EXC_0x2C(KERN_NOTICE));
-		CHK_DEBUGGER_TRAP();
 		break;
 	/* 0x2D - Instruction CPLB Multiple Hits, handled here */
 	case VEC_CPLB_I_MHIT:
@@ -454,14 +451,14 @@ asmlinkage void trap_c(struct pt_regs *fp)
 		else
 #endif
 			printk(KERN_NOTICE EXC_0x2D(KERN_NOTICE));
-		CHK_DEBUGGER_TRAP();
+		CHK_DEBUGGER_TRAP_MAYBE();
 		break;
 	/* 0x2E - Illegal use of Supervisor Resource, handled here */
 	case VEC_ILL_RES:
 		info.si_code = ILL_PRVOPC;
 		sig = SIGILL;
 		printk(KERN_NOTICE EXC_0x2E(KERN_NOTICE));
-		CHK_DEBUGGER_TRAP();
+		CHK_DEBUGGER_TRAP_MAYBE();
 		break;
 	/* 0x2F - Reserved, Caught by default */
 	/* 0x30 - Reserved, Caught by default */
@@ -508,14 +505,14 @@ asmlinkage void trap_c(struct pt_regs *fp)
 			printk(KERN_NOTICE HWC_default(KERN_NOTICE));
 			break;
 		}
-		CHK_DEBUGGER_TRAP();
+		CHK_DEBUGGER_TRAP_MAYBE();
 		break;
 	default:
 		info.si_code = TRAP_ILLTRAP;
 		sig = SIGTRAP;
 		printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 			(fp->seqstat & SEQSTAT_EXCAUSE));
-		CHK_DEBUGGER_TRAP();
+		CHK_DEBUGGER_TRAP_MAYBE();
 		break;
 	}