src/include/sof/debug.h

/*
 * Copyright (c) 2016, Intel Corporation
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *   * Neither the name of the Intel Corporation nor the
 *     names of its contributors may be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * Author: Liam Girdwood <liam.r.girdwood@linux.intel.com>
 *         Keyon Jie <yang.jie@linux.intel.com>
 */

#ifndef __INCLUDE_DEBUG__
#define __INCLUDE_DEBUG__

#include <sof/sof.h>
#include <sof/mailbox.h>
#include <uapi/ipc.h>
#include <platform/platform.h>
#include <stdint.h>
#include <stdlib.h>


#define DEBUG

#ifdef DEBUG

/* dump file and line to start of mailbox or shared memory */
#define dbg() \
	do { \
		volatile uint32_t *__m = (uint32_t*)mailbox_get_debug_base(); \
		*(__m++) = (__FILE__[0] << 24) + (__FILE__[1] << 16) +\
			 (__FILE__[2] << 8) + (__FILE__[3]); \
		*(__m++) = (__func__[0] << 24) + (__func__[1] << 16) + \
			(__func__[2] << 8) + (__func__[3]); \
		*__m = __LINE__; \
	} while (0);

/* dump file and line to offset in mailbox or shared memory */
#define dbg_at(__x) \
	do { \
		volatile uint32_t *__m = (uint32_t*)mailbox_get_debug_base() + __x; \
		*(__m++) = (__FILE__[0] << 24) + (__FILE__[1] << 16) +\
			 (__FILE__[2] << 8) + (__FILE__[3]); \
		*(__m++) = (__func__[0] << 24) + (__func__[1] << 16) + \
			(__func__[2] << 8) + (__func__[3]); \
		*__m = __LINE__; \
	} while (0);

/* dump value to start of mailbox or shared memory */
#define dbg_val(__v) \
	do { \
		volatile uint32_t *__m = \
			(volatile uint32_t*)mailbox_get_debug_base(); \
		*__m = __v; \
	} while (0);

/* dump value to offset in mailbox or shared memory */
#define dbg_val_at(__v, __x) \
	do { \
		volatile uint32_t *__m = \
			(volatile uint32_t*)mailbox_get_debug_base() + __x; \
		*__m = __v; \
	} while (0);

/* dump data area at addr and size count to start of mailbox or shared memory */
#define dump(addr, count) \
	do { \
		volatile uint32_t *__m = (uint32_t*)mailbox_get_debug_base(); \
		volatile uint32_t *__a = (uint32_t*)addr; \
		volatile int __c = count; \
		while (__c--) \
			*(__m++) = *(__a++); \
	} while (0);

/* dump data area at addr and size count at mailbox offset or shared memory */
#define dump_at(addr, count, offset) \
	do { \
		volatile uint32_t *__m = (uint32_t*)mailbox_get_debug_base() + offset; \
		volatile uint32_t *__a = (uint32_t*)addr; \
		volatile int __c = count; \
		while (__c--) \
			*(__m++) = *(__a++); \
	} while (0);

/* dump object to start of mailbox */
#define dump_object(__o) \
	dbg(); \
	dump(&__o, sizeof(__o) >> 2);

/* dump object from pointer at start of mailbox */
#define dump_object_ptr(__o) \
	dbg(); \
	dump(__o, sizeof(*(__o)) >> 2);

#define dump_object_ptr_at(__o, __at) \
	dbg(); \
	dump_at(__o, sizeof(*(__o)) >> 2, __at);

#else

#define dbg()
#define dbg_at(__x)
#define dbg_val(__v)
#define dbg_val_at(__v, __x)
#define dump(addr, count)
#define dump_object(__o)
#define dump_object_ptr(__o)
#endif

/* dump stack as part of panic */
static inline uint32_t dump_stack(uint32_t p, void *addr, size_t offset,
	size_t limit)
{
	extern void *__stack;
	extern void *_stack_sentry;
	void *stack_bottom = (void *)&__stack - sizeof(void *);
	void *stack_limit = (void *)&_stack_sentry;
	void *stack_top = arch_get_stack_ptr() + offset;
	size_t size = stack_bottom - stack_top;

	/* is stack smashed ? */
	if (stack_top - offset <= stack_limit) {
		stack_bottom = stack_limit;
		p = SOF_IPC_PANIC_STACK;
		return p;
	}

	/* make sure stack size won't overflow dump area */
	if (size > limit)
		size = limit;

	/* copy stack contents and writeback */
	rmemcpy(addr, stack_top, size - sizeof(void *));
	dcache_writeback_region(addr, size - sizeof(void *));
	return p;
}

#endif