path: root/arch/blackfin/kernel/trace.c

/* provide some functions which dump the trace buffer, in a nice way for people
 * to read it, and understand what is going on
 *
 * Copyright 2004-2010 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later
 */

#include <linux/kernel.h>
#include <linux/hardirq.h>
#include <linux/thread_info.h>
#include <linux/mm.h>
#include <linux/uaccess.h>
#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/irq.h>
#include <asm/dma.h>
#include <asm/trace.h>
#include <asm/fixed_code.h>
#include <asm/traps.h>
#include <asm/irq_handler.h>
#include <asm/pda.h>

void decode_address(char *buf, unsigned long address)
{
	struct task_struct *p;
	struct mm_struct *mm;
	unsigned long flags, offset;
	unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
	struct rb_node *n;

#ifdef CONFIG_KALLSYMS
	unsigned long symsize;
	const char *symname;
	char *modname;
	char *delim = ":";
	char namebuf[128];
#endif

	buf += sprintf(buf, "<0x%08lx> ", address);

#ifdef CONFIG_KALLSYMS
	/* look up the address and see if we are in kernel space */
	symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);

	if (symname) {
		/* yeah! kernel space! */
		if (!modname)
			modname = delim = "";
		sprintf(buf, "{ %s%s%s%s + 0x%lx }",
			delim, modname, delim, symname,
			(unsigned long)offset);
		return;
	}
#endif

	if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
		/* Problem in fixed code section? */
		strcat(buf, "/* Maybe fixed code section */");
		return;

	} else if (address < CONFIG_BOOT_LOAD) {
		/* Problem somewhere before the kernel start address */
		strcat(buf, "/* Maybe null pointer? */");
		return;

	} else if (address >= COREMMR_BASE) {
		strcat(buf, "/* core mmrs */");
		return;

	} else if (address >= SYSMMR_BASE) {
		strcat(buf, "/* system mmrs */");
		return;

	} else if (address >= L1_ROM_START && address < L1_ROM_START + L1_ROM_LENGTH) {
		strcat(buf, "/* on-chip L1 ROM */");
		return;

	} else if (address >= L1_SCRATCH_START && address < L1_SCRATCH_START + L1_SCRATCH_LENGTH) {
		strcat(buf, "/* on-chip scratchpad */");
		return;

	} else if (address >= physical_mem_end && address < ASYNC_BANK0_BASE) {
		strcat(buf, "/* unconnected memory */");
		return;

	} else if (address >= ASYNC_BANK3_BASE + ASYNC_BANK3_SIZE && address < BOOT_ROM_START) {
		strcat(buf, "/* reserved memory */");
		return;

	} else if (address >= L1_DATA_A_START && address < L1_DATA_A_START + L1_DATA_A_LENGTH) {
		strcat(buf, "/* on-chip Data Bank A */");
		return;

	} else if (address >= L1_DATA_B_START && address < L1_DATA_B_START + L1_DATA_B_LENGTH) {
		strcat(buf, "/* on-chip Data Bank B */");
		return;
	}

	/*
	 * Don't walk any of the vmas if we are oopsing, it has been known
	 * to cause problems - corrupt vmas (kernel crashes) cause double faults
	 */
	if (oops_in_progress) {
		strcat(buf, "/* kernel dynamic memory (maybe user-space) */");
		return;
	}

	/* looks like we're off in user-land, so let's walk all the
	 * mappings of all our processes and see if we can't be a whee
	 * bit more specific
	 */
	write_lock_irqsave(&tasklist_lock, flags);
	for_each_process(p) {
		mm = (in_atomic ? p->mm : get_task_mm(p));
		if (!mm)
			continue;

		if (!down_read_trylock(&mm->mmap_sem)) {
			if (!in_atomic)
				mmput(mm);
			continue;
		}

		for (n = rb_first(&mm->mm_rb); n; n = rb_next(n)) {
			struct vm_area_struct *vma;

			vma = rb_entry(n, struct vm_area_struct, vm_rb);

			if (address >= vma->vm_start && address < vma->vm_end) {
				char _tmpbuf[256];
				char *name = p->comm;
				struct file *file = vma->vm_file;

				if (file) {
					char *d_name = d_path(&file->f_path, _tmpbuf,
						      sizeof(_tmpbuf));
					if (!IS_ERR(d_name))
						name = d_name;
				}

				/* FLAT does not have its text aligned to the start of
				 * the map while FDPIC ELF does ...
				 */

				/* before we can check flat/fdpic, we need to
				 * make sure current is valid
				 */
				if ((unsigned long)current >= FIXED_CODE_START &&
				    !((unsigned long)current & 0x3)) {
					if (current->mm &&
					    (address > current->mm->start_code) &&
					    (address < current->mm->end_code))
						offset = address - current->mm->start_code;
					else
						offset = (address - vma->vm_start) +
							 (vma->vm_pgoff << PAGE_SHIFT);

					sprintf(buf, "[ %s + 0x%lx ]", name, offset);
				} else
					sprintf(buf, "[ %s vma:0x%lx-0x%lx]",
						name, vma->vm_start, vma->vm_end);

				up_read(&mm->mmap_sem);
				if (!in_atomic)
					mmput(mm);

				if (buf[0] == '\0')
					sprintf(buf, "[ %s ] dynamic memory", name);

				goto done;
			}
		}

		up_read(&mm->mmap_sem);
		if (!in_atomic)
			mmput(mm);
	}

	/*
	 * we were unable to find this address anywhere,
	 * or some MMs were skipped because they were in use.
	 */
	sprintf(buf, "/* kernel dynamic memory */");

done:
	write_unlock_irqrestore(&tasklist_lock, flags);
}

#define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)

/*
 * Similar to get_user, do some address checking, then dereference
 * Return true on success, false on bad address
 */
bool get_mem16(unsigned short *val, unsigned short *address)
{
	unsigned long addr = (unsigned long)address;

	/* Check for odd addresses */
	if (addr & 0x1)
		return false;

	switch (bfin_mem_access_type(addr, 2)) {
	case BFIN_MEM_ACCESS_CORE:
	case BFIN_MEM_ACCESS_CORE_ONLY:
		*val = *address;
		return true;
	case BFIN_MEM_ACCESS_DMA:
		dma_memcpy(val, address, 2);
		return true;
	case BFIN_MEM_ACCESS_ITEST:
		isram_memcpy(val, address, 2);
		return true;
	default: /* invalid access */
		return false;
	}
}

bool get_instruction(unsigned int *val, unsigned short *address)
{
	unsigned long addr = (unsigned long)address;
	unsigned short opcode0, opcode1;

	/* Check for odd addresses */
	if (addr & 0x1)
		return false;

	/* MMR region will never have instructions */
	if (addr >= SYSMMR_BASE)
		return false;

	/* Scratchpad will never have instructions */
	if (addr >= L1_SCRATCH_START && addr < L1_SCRATCH_START + L1_SCRATCH_LENGTH)
		return false;

	/* Data banks will never have instructions */
	if (addr >= BOOT_ROM_START + BOOT_ROM_LENGTH && addr < L1_CODE_START)
		return false;

	if (!get_mem16(&opcode0, address))
		return false;

	/* was this a 32-bit instruction? If so, get the next 16 bits */
	if ((opcode0 & 0xc000) == 0xc000) {
		if (!get_mem16(&opcode1, address + 1))
			return false;
		*val = (opcode0 << 16) + opcode1;
	} else
		*val = opcode0;

	return true;
}

#if defined(CONFIG_DEBUG_BFIN_HWTRACE_ON)
/*
 * decode the instruction if we are printing out the trace, as it
 * makes things easier to follow, without running it through objdump
 * Decode the change of flow, and the common load/store instructions
 * which are the main cause for faults, and discontinuities in the trace
 * buffer.
 */

#define ProgCtrl_opcode         0x0000
#define ProgCtrl_poprnd_bits    0
#define ProgCtrl_poprnd_mask    0xf
#define ProgCtrl_prgfunc_bits   4
#define ProgCtrl_prgfunc_mask   0xf
#define ProgCtrl_code_bits      8
#define ProgCtrl_code_mask      0xff

static void decode_ProgCtrl_0(unsigned int opcode)
{
	int poprnd  = ((opcode >> ProgCtrl_poprnd_bits) & ProgCtrl_poprnd_mask);
	int prgfunc = ((opcode >> ProgCtrl_prgfunc_bits) & ProgCtrl_prgfunc_mask);

	if (prgfunc == 0 && poprnd == 0)
		pr_cont("NOP");
	else if (prgfunc == 1 && poprnd == 0)
		pr_cont("RTS");
	else if (prgfunc == 1 && poprnd == 1)
		pr_cont("RTI");
	else if (prgfunc == 1 && poprnd == 2)
		pr_cont("RTX");
	else if (prgfunc == 1 && poprnd == 3)
		pr_cont("RTN");
	else if (prgfunc == 1 && poprnd == 4)
		pr_cont("RTE");
	else if (prgfunc == 2 && poprnd == 0)
		pr_cont("IDLE");
	else if (prgfunc == 2 && poprnd == 3)
		pr_cont("CSYNC");
	else if (prgfunc == 2 && poprnd == 4)
		pr_cont("SSYNC");
	else if (prgfunc == 2 && poprnd == 5)
		pr_cont("EMUEXCPT");
	else if (prgfunc == 3)
		pr_cont("CLI R%i", poprnd);
	else if (prgfunc == 4)
		pr_cont("STI R%i", poprnd);
	else if (prgfunc == 5)
		pr_cont("JUMP (P%i)", poprnd);
	else if (prgfunc == 6)
		pr_cont("CALL (P%i)", poprnd);
	else if (prgfunc == 7)
		pr_cont("CALL (PC + P%i)", poprnd);
	else if (prgfunc == 8)
		pr_cont("JUMP (PC + P%i", poprnd);
	else if (prgfunc == 9)
		pr_cont("RAISE %i", poprnd);
	else if (prgfunc == 10)
		pr_cont("EXCPT %i", poprnd);
	else
		pr_cont("0x%04x", opcode);

}

#define BRCC_opcode             0x1000
#define BRCC_offset_bits        0
#define BRCC_offset_mask        0x3ff
#define BRCC_B_bits             10
#define BRCC_B_mask             0x1
#define BRCC_T_bits             11
#define BRCC_T_mask             0x1
#define BRCC_code_bits          12
#define BRCC_code_mask          0xf

static void decode_BRCC_0(unsigned int opcode)
{
	int B = ((opcode >> BRCC_B_bits) & BRCC_B_mask);
	int T = ((opcode >> BRCC_T_bits) & BRCC_T_mask);

	pr_cont("IF %sCC JUMP pcrel %s", T ? "" : "!", B ? "(BP)" : "");
}

#define CALLa_opcode    0xe2000000
#define CALLa_addr_bits 0
#define CALLa_addr_mask 0xffffff
#define CALLa_S_bits    24
#define CALLa_S_mask    0x1
#define CALLa_code_bits 25
#define CALLa_code_mask 0x7f

static void decode_CALLa_0(unsigned int opcode)
{
	int S   = ((opcode >> (CALLa_S_bits - 16)) & CALLa_S_mask);

	if (S)
		pr_cont("CALL pcrel");
	else
		pr_cont("JUMP.L");
}

#define LoopSetup_opcode                0xe0800000
#define LoopSetup_eoffset_bits          0
#define LoopSetup_eoffset_mask          0x3ff
#define LoopSetup_dontcare_bits         10
#define LoopSetup_dontcare_mask         0x3
#define LoopSetup_reg_bits              12
#define LoopSetup_reg_mask              0xf
#define LoopSetup_soffset_bits          16
#define LoopSetup_soffset_mask          0xf
#define LoopSetup_c_bits                20
#define LoopSetup_c_mask                0x1
#define LoopSetup_rop_bits              21
#define LoopSetup_rop_mask              0x3
#define LoopSetup_code_bits             23
#define LoopSetup_code_mask             0x1ff

static void decode_LoopSetup_0(unsigned int opcode)
{
	int c   = ((opcode >> LoopSetup_c_bits)   & LoopSetup_c_mask);
	int reg = ((opcode >> LoopSetup_reg_bits) & LoopSetup_reg_mask);
	int rop = ((opcode >> LoopSetup_rop_bits) & LoopSetup_rop_mask);

	pr_cont("LSETUP <> LC%i", c);
	if ((rop & 1) == 1)
		pr_cont("= P%i", reg);
	if ((rop & 2) == 2)
		pr_cont(" >> 0x1");
}

#define DspLDST_opcode          0x9c00
#define DspLDST_reg_bits        0
#define DspLDST_reg_mask        0x7
#define DspLDST_i_bits          3
#define DspLDST_i_mask          0x3
#define DspLDST_m_bits          5
#define DspLDST_m_mask          0x3
#define DspLDST_aop_bits        7
#define DspLDST_aop_mask        0x3
#define DspLDST_W_bits          9
#define DspLDST_W_mask          0x1
#define DspLDST_code_bits       10
#define DspLDST_code_mask       0x3f

static void decode_dspLDST_0(unsigned int opcode)
{
	int i   = ((opcode >> DspLDST_i_bits) & DspLDST_i_mask);
	int m   = ((opcode >> DspLDST_m_bits) & DspLDST_m_mask);
	int W   = ((opcode >> DspLDST_W_bits) & DspLDST_W_mask);
	int aop = ((opcode >> DspLDST_aop_bits) & DspLDST_aop_mask);
	int reg = ((opcode >> DspLDST_reg_bits) & DspLDST_reg_mask);

	if (W == 0) {
		pr_cont("R%i", reg);
		switch (m) {
		case 0:
			pr_cont(" = ");
			break;
		case 1:
			pr_cont(".L = ");
			break;
		case 2:
			pr_cont(".W = ");
			break;
		}
	}

	pr_cont("[ I%i", i);

	switch (aop) {
	case 0:
		pr_cont("++ ]");
		break;
	case 1:
		pr_cont("-- ]");
		break;
	}

	if (W == 1) {
		pr_cont(" = R%i", reg);
		switch (m) {
		case 1:
			pr_cont(".L = ");
			break;
		case 2:
			pr_cont(".W = ");
			break;
		}
	}
}

#define LDST_opcode             0x9000
#define LDST_reg_bits           0
#define LDST_reg_mask           0x7
#define LDST_ptr_bits           3
#define LDST_ptr_mask           0x7
#define LDST_Z_bits             6
#define LDST_Z_mask             0x1
#define LDST_aop_bits           7
#define LDST_aop_mask           0x3
#define LDST_W_bits             9
#define LDST_W_mask             0x1
#define LDST_sz_bits            10
#define LDST_sz_mask            0x3
#define LDST_code_bits          12
#define LDST_code_mask          0xf

static void decode_LDST_0(unsigned int opcode)
{
	int Z   = ((opcode >> LDST_Z_bits) & LDST_Z_mask);
	int W   = ((opcode >> LDST_W_bits) & LDST_W_mask);
	int sz  = ((opcode >> LDST_sz_bits) & LDST_sz_mask);
	int aop = ((opcode >> LDST_aop_bits) & LDST_aop_mask);
	int reg = ((opcode >> LDST_reg_bits) & LDST_reg_mask);
	int ptr = ((opcode >> LDST_ptr_bits) & LDST_ptr_mask);

	if (W == 0)
		pr_cont("%s%i = ", (sz == 0 && Z == 1) ? "P" : "R", reg);

	switch (sz) {
	case 1:
		pr_cont("W");
		break;
	case 2:
		pr_cont("B");
		break;
	}

	pr_cont("[P%i", ptr);

	switch (aop) {
	case 0:
		pr_cont("++");
		break;
	case 1:
		pr_cont("--");
		break;
	}
	pr_cont("]");

	if (W == 1)
		pr_cont(" = %s%i ", (sz == 0 && Z == 1) ? "P" : "R", reg);

	if (sz) {
		if (Z)
			pr_cont(" (X)");
		else
			pr_cont(" (Z)");
	}
}

#define LDSTii_opcode           0xa000
#define LDSTii_reg_bit          0
#define LDSTii_reg_mask         0x7
#define LDSTii_ptr_bit          3
#define LDSTii_ptr_mask         0x7
#define LDSTii_offset_bit       6
#define LDSTii_offset_mask      0xf
#define LDSTii_op_bit           10
#define LDSTii_op_mask          0x3
#define LDSTii_W_bit            12
#define LDSTii_W_mask           0x1
#define LDSTii_code_bit         13
#define LDSTii_code_mask        0x7

static void decode_LDSTii_0(unsigned int opcode)
{
	int reg = ((opcode >> LDSTii_reg_bit) & LDSTii_reg_mask);
	int ptr = ((opcode >> LDSTii_ptr_bit) & LDSTii_ptr_mask);
	int offset = ((opcode >> LDSTii_offset_bit) & LDSTii_offset_mask);
	int op = ((opcode >> LDSTii_op_bit) & LDSTii_op_mask);
	int W = ((opcode >> LDSTii_W_bit) & LDSTii_W_mask);

	if (W == 0) {
		pr_cont("%s%i = %s[P%i + %i]", op == 3 ? "R" : "P", reg,
			op == 1 || op == 2 ? "" : "W", ptr, offset);
		if (op == 2)
			pr_cont("(Z)");
		if (op == 3)
			pr_cont("(X)");
	} else {
		pr_cont("%s[P%i + %i] = %s%i", op == 0 ? "" : "W", ptr,
			offset, op == 3 ? "P" : "R", reg);
	}
}

#define LDSTidxI_opcode         0xe4000000
#define LDSTidxI_offset_bits    0
#define LDSTidxI_offset_mask    0xffff
#define LDSTidxI_reg_bits       16
#define LDSTidxI_reg_mask       0x7
#define LDSTidxI_ptr_bits       19
#define LDSTidxI_ptr_mask       0x7
#define LDSTidxI_sz_bits        22
#define LDSTidxI_sz_mask        0x3
#define LDSTidxI_Z_bits         24
#define LDSTidxI_Z_mask         0x1
#define LDSTidxI_W_bits         25
#define LDSTidxI_W_mask         0x1
#define LDSTidxI_code_bits      26
#define LDSTidxI_code_mask      0x3f

static void decode_LDSTidxI_0(unsigned int opcode)
{
	int Z      = ((opcode >> LDSTidxI_Z_bits)      & LDSTidxI_Z_mask);
	int W      = ((opcode >> LDSTidxI_W_bits)      & LDSTidxI_W_mask);
	int sz     = ((opcode >> LDSTidxI_sz_bits)     & LDSTidxI_sz_mask);
	int reg    = ((opcode >> LDSTidxI_reg_bits)    & LDSTidxI_reg_mask);
	int ptr    = ((opcode >> LDSTidxI_ptr_bits)    & LDSTidxI_ptr_mask);
	int offset = ((opcode >> LDSTidxI_offset_bits) & LDSTidxI_offset_mask);

	if (W == 0)
		pr_cont("%s%i = ", sz == 0 && Z == 1 ? "P" : "R", reg);

	if (sz == 1)
		pr_cont("W");
	if (sz == 2)
		pr_cont("B");

	pr_cont("[P%i + %s0x%x]", ptr, offset & 0x20 ? "-" : "",
		(offset & 0x1f) << 2);

	if (W == 0 && sz != 0) {
		if (Z)
			pr_cont("(X)");
		else
			pr_cont("(Z)");
	}

	if (W == 1)
		pr_cont("= %s%i", (sz == 0 && Z == 1) ? "P" : "R", reg);

}

static void decode_opcode(unsigned int opcode)
{
#ifdef CONFIG_BUG
	if (opcode == BFIN_BUG_OPCODE)
		pr_cont("BUG");
	else
#endif
	if ((opcode & 0xffffff00) == ProgCtrl_opcode)
		decode_ProgCtrl_0(opcode);
	else if ((opcode & 0xfffff000) == BRCC_opcode)
		decode_BRCC_0(opcode);
	else if ((opcode & 0xfffff000) == 0x2000)
		pr_cont("JUMP.S");
	else if ((opcode & 0xfe000000) == CALLa_opcode)
		decode_CALLa_0(opcode);
	else if ((opcode & 0xff8000C0) == LoopSetup_opcode)
		decode_LoopSetup_0(opcode);
	else if ((opcode & 0xfffffc00) == DspLDST_opcode)
		decode_dspLDST_0(opcode);
	else if ((opcode & 0xfffff000) == LDST_opcode)
		decode_LDST_0(opcode);
	else if ((opcode & 0xffffe000) == LDSTii_opcode)
		decode_LDSTii_0(opcode);
	else if ((opcode & 0xfc000000) == LDSTidxI_opcode)
		decode_LDSTidxI_0(opcode);
	else if (opcode & 0xffff0000)
		pr_cont("0x%08x", opcode);
	else
		pr_cont("0x%04x", opcode);
}

#define BIT_MULTI_INS 0x08000000
static void decode_instruction(unsigned short *address)
{
	unsigned int opcode;

	if (!get_instruction(&opcode, address))
		return;

	decode_opcode(opcode);

	/* If things are a 32-bit instruction, it has the possibility of being
	 * a multi-issue instruction (a 32-bit, and 2 16 bit instrucitions)
	 * This test collidates with the unlink instruction, so disallow that
	 */
	if ((opcode & 0xc0000000) == 0xc0000000 &&
	    (opcode & BIT_MULTI_INS) &&
	    (opcode & 0xe8000000) != 0xe8000000) {
		pr_cont(" || ");
		if (!get_instruction(&opcode, address + 2))
			return;
		decode_opcode(opcode);
		pr_cont(" || ");
		if (!get_instruction(&opcode, address + 3))
			return;
		decode_opcode(opcode);
	}
}
#endif

void dump_bfin_trace_buffer(void)
{
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
	int tflags, i = 0, fault = 0;
	char buf[150];
	unsigned short *addr;
	unsigned int cpu = raw_smp_processor_id();
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
	int j, index;
#endif

	trace_buffer_save(tflags);

	pr_notice("Hardware Trace:\n");

#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
	pr_notice("WARNING: Expanded trace turned on - can not trace exceptions\n");
#endif

	if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
		for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
			addr = (unsigned short *)bfin_read_TBUF();
			decode_address(buf, (unsigned long)addr);
			pr_notice("%4i Target : %s\n", i, buf);
			/* Normally, the faulting instruction doesn't go into
			 * the trace buffer, (since it doesn't commit), so
			 * we print out the fault address here
			 */
			if (!fault && addr == ((unsigned short *)evt_ivhw)) {
				addr = (unsigned short *)bfin_read_TBUF();
				decode_address(buf, (unsigned long)addr);
				pr_notice("      FAULT : %s ", buf);
				decode_instruction(addr);
				pr_cont("\n");
				fault = 1;
				continue;
			}
			if (!fault && addr == (unsigned short *)trap &&
				(cpu_pda[cpu].seqstat & SEQSTAT_EXCAUSE) > VEC_EXCPT15) {
				decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
				pr_notice("      FAULT : %s ", buf);
				decode_instruction((unsigned short *)cpu_pda[cpu].icplb_fault_addr);
				pr_cont("\n");
				fault = 1;
			}
			addr = (unsigned short *)bfin_read_TBUF();
			decode_address(buf, (unsigned long)addr);
			pr_notice("     Source : %s ", buf);
			decode_instruction(addr);
			pr_cont("\n");
		}
	}

#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
	if (trace_buff_offset)
		index = trace_buff_offset / 4;
	else
		index = EXPAND_LEN;

	j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
	while (j) {
		decode_address(buf, software_trace_buff[index]);
		pr_notice("%4i Target : %s\n", i, buf);
		index -= 1;
		if (index < 0)
			index = EXPAND_LEN;
		decode_address(buf, software_trace_buff[index]);
		pr_notice("     Source : %s ", buf);
		decode_instruction((unsigned short *)software_trace_buff[index]);
		pr_cont("\n");
		index -= 1;
		if (index < 0)
			index = EXPAND_LEN;
		j--;
		i++;
	}
#endif

	trace_buffer_restore(tflags);
#endif
}
EXPORT_SYMBOL(dump_bfin_trace_buffer);

void dump_bfin_process(struct pt_regs *fp)
{
	/* We should be able to look at fp->ipend, but we don't push it on the
	 * stack all the time, so do this until we fix that */
	unsigned int context = bfin_read_IPEND();

	if (oops_in_progress)
		pr_emerg("Kernel OOPS in progress\n");

	if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
		pr_notice("HW Error context\n");
	else if (context & 0x0020)
		pr_notice("Deferred Exception context\n");
	else if (context & 0x3FC0)
		pr_notice("Interrupt context\n");
	else if (context & 0x4000)
		pr_notice("Deferred Interrupt context\n");
	else if (context & 0x8000)
		pr_notice("Kernel process context\n");

	/* Because we are crashing, and pointers could be bad, we check things
	 * pretty closely before we use them
	 */
	if ((unsigned long)current >= FIXED_CODE_START &&
	    !((unsigned long)current & 0x3) && current->pid) {
		pr_notice("CURRENT PROCESS:\n");
		if (current->comm >= (char *)FIXED_CODE_START)
			pr_notice("COMM=%s PID=%d",
				current->comm, current->pid);
		else
			pr_notice("COMM= invalid");

		pr_cont("  CPU=%d\n", current_thread_info()->cpu);
		if (!((unsigned long)current->mm & 0x3) &&
			(unsigned long)current->mm >= FIXED_CODE_START) {
			pr_notice("TEXT = 0x%p-0x%p        DATA = 0x%p-0x%p\n",
				(void *)current->mm->start_code,
				(void *)current->mm->end_code,
				(void *)current->mm->start_data,
				(void *)current->mm->end_data);
			pr_notice(" BSS = 0x%p-0x%p  USER-STACK = 0x%p\n\n",
				(void *)current->mm->end_data,
				(void *)current->mm->brk,
				(void *)current->mm->start_stack);
		} else
			pr_notice("invalid mm\n");
	} else
		pr_notice("No Valid process in current context\n");
}

void dump_bfin_mem(struct pt_regs *fp)
{
	unsigned short *addr, *erraddr, val = 0, err = 0;
	char sti = 0, buf[6];

	erraddr = (void *)fp->pc;

	pr_notice("return address: [0x%p]; contents of:", erraddr);

	for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
	     addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
	     addr++) {
		if (!((unsigned long)addr & 0xF))
			pr_notice("0x%p: ", addr);

		if (!get_mem16(&val, addr)) {
				val = 0;
				sprintf(buf, "????");
		} else
			sprintf(buf, "%04x", val);

		if (addr == erraddr) {
			pr_cont("[%s]", buf);
			err = val;
		} else
			pr_cont(" %s ", buf);

		/* Do any previous instructions turn on interrupts? */
		if (addr <= erraddr &&				/* in the past */
		    ((val >= 0x0040 && val <= 0x0047) ||	/* STI instruction */
		      val == 0x017b))				/* [SP++] = RETI */
			sti = 1;
	}

	pr_cont("\n");

	/* Hardware error interrupts can be deferred */
	if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
	    oops_in_progress)){
		pr_notice("Looks like this was a deferred error - sorry\n");
#ifndef CONFIG_DEBUG_HWERR
		pr_notice("The remaining message may be meaningless\n");
		pr_notice("You should enable CONFIG_DEBUG_HWERR to get a better idea where it came from\n");
#else
		/* If we are handling only one peripheral interrupt
		 * and current mm and pid are valid, and the last error
		 * was in that user space process's text area
		 * print it out - because that is where the problem exists
		 */
		if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
		     (current->pid && current->mm)) {
			/* And the last RETI points to the current userspace context */
			if ((fp + 1)->pc >= current->mm->start_code &&
			    (fp + 1)->pc <= current->mm->end_code) {
				pr_notice("It might be better to look around here :\n");
				pr_notice("-------------------------------------------\n");
				show_regs(fp + 1);
				pr_notice("-------------------------------------------\n");
			}
		}
#endif
	}
}

void show_regs(struct pt_regs *fp)
{
	char buf[150];
	struct irqaction *action;
	unsigned int i;
	unsigned long flags = 0;
	unsigned int cpu = raw_smp_processor_id();
	unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();

	pr_notice("\n");
	if (CPUID != bfin_cpuid())
		pr_notice("Compiled for cpu family 0x%04x (Rev %d), "
			"but running on:0x%04x (Rev %d)\n",
			CPUID, bfin_compiled_revid(), bfin_cpuid(), bfin_revid());

	pr_notice("ADSP-%s-0.%d",
		CPU, bfin_compiled_revid());

	if (bfin_compiled_revid() !=  bfin_revid())
		pr_cont("(Detected 0.%d)", bfin_revid());

	pr_cont(" %lu(MHz CCLK) %lu(MHz SCLK) (%s)\n",
		get_cclk()/1000000, get_sclk()/1000000,
#ifdef CONFIG_MPU
		"mpu on"
#else
		"mpu off"
#endif
		);

	pr_notice("%s", linux_banner);

	pr_notice("\nSEQUENCER STATUS:\t\t%s\n", print_tainted());
	pr_notice(" SEQSTAT: %08lx  IPEND: %04lx  IMASK: %04lx  SYSCFG: %04lx\n",
		(long)fp->seqstat, fp->ipend, cpu_pda[raw_smp_processor_id()].ex_imask, fp->syscfg);
	if (fp->ipend & EVT_IRPTEN)
		pr_notice("  Global Interrupts Disabled (IPEND[4])\n");
	if (!(cpu_pda[raw_smp_processor_id()].ex_imask & (EVT_IVG13 | EVT_IVG12 | EVT_IVG11 |
			EVT_IVG10 | EVT_IVG9 | EVT_IVG8 | EVT_IVG7 | EVT_IVTMR)))
		pr_notice("  Peripheral interrupts masked off\n");
	if (!(cpu_pda[raw_smp_processor_id()].ex_imask & (EVT_IVG15 | EVT_IVG14)))
		pr_notice("  Kernel interrupts masked off\n");
	if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) {
		pr_notice("  HWERRCAUSE: 0x%lx\n",
			(fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
#ifdef EBIU_ERRMST
		/* If the error was from the EBIU, print it out */
		if (bfin_read_EBIU_ERRMST() & CORE_ERROR) {
			pr_notice("  EBIU Error Reason  : 0x%04x\n",
				bfin_read_EBIU_ERRMST());
			pr_notice("  EBIU Error Address : 0x%08x\n",
				bfin_read_EBIU_ERRADD());
		}
#endif
	}
	pr_notice("  EXCAUSE   : 0x%lx\n",
		fp->seqstat & SEQSTAT_EXCAUSE);
	for (i = 2; i <= 15 ; i++) {
		if (fp->ipend & (1 << i)) {
			if (i != 4) {
				decode_address(buf, bfin_read32(EVT0 + 4*i));
				pr_notice("  physical IVG%i asserted : %s\n", i, buf);
			} else
				pr_notice("  interrupts disabled\n");
		}
	}

	/* if no interrupts are going off, don't print this out */
	if (fp->ipend & ~0x3F) {
		for (i = 0; i < (NR_IRQS - 1); i++) {
			struct irq_desc *desc = irq_to_desc(i);
			if (!in_atomic)
				raw_spin_lock_irqsave(&desc->lock, flags);

			action = desc->action;
			if (!action)
				goto unlock;

			decode_address(buf, (unsigned int)action->handler);
			pr_notice("  logical irq %3d mapped  : %s", i, buf);
			for (action = action->next; action; action = action->next) {
				decode_address(buf, (unsigned int)action->handler);
				pr_cont(", %s", buf);
			}
			pr_cont("\n");
unlock:
			if (!in_atomic)
				raw_spin_unlock_irqrestore(&desc->lock, flags);
		}
	}

	decode_address(buf, fp->rete);
	pr_notice(" RETE: %s\n", buf);
	decode_address(buf, fp->retn);
	pr_notice(" RETN: %s\n", buf);
	decode_address(buf, fp->retx);
	pr_notice(" RETX: %s\n", buf);
	decode_address(buf, fp->rets);
	pr_notice(" RETS: %s\n", buf);
	decode_address(buf, fp->pc);
	pr_notice(" PC  : %s\n", buf);

	if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
	    (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
		decode_address(buf, cpu_pda[cpu].dcplb_fault_addr);
		pr_notice("DCPLB_FAULT_ADDR: %s\n", buf);
		decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
		pr_notice("ICPLB_FAULT_ADDR: %s\n", buf);
	}

	pr_notice("PROCESSOR STATE:\n");
	pr_notice(" R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
		fp->r0, fp->r1, fp->r2, fp->r3);
	pr_notice(" R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
		fp->r4, fp->r5, fp->r6, fp->r7);
	pr_notice(" P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
		fp->p0, fp->p1, fp->p2, fp->p3);
	pr_notice(" P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
		fp->p4, fp->p5, fp->fp, (long)fp);
	pr_notice(" LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
		fp->lb0, fp->lt0, fp->lc0);
	pr_notice(" LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
		fp->lb1, fp->lt1, fp->lc1);
	pr_notice(" B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
		fp->b0, fp->l0, fp->m0, fp->i0);
	pr_notice(" B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
		fp->b1, fp->l1, fp->m1, fp->i1);
	pr_notice(" B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
		fp->b2, fp->l2, fp->m2, fp->i2);
	pr_notice(" B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
		fp->b3, fp->l3, fp->m3, fp->i3);
	pr_notice("A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
		fp->a0w, fp->a0x, fp->a1w, fp->a1x);

	pr_notice("USP : %08lx  ASTAT: %08lx\n",
		rdusp(), fp->astat);

	pr_notice("\n");
}