/*
* Copyright 2010 Tilera Corporation. All Rights Reserved.
*
* 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, version 2.
*
* 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, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for
* more details.
*/

#ifndef _ASM_TILE_STACK_H
#define _ASM_TILE_STACK_H

#include <linux/types.h>
#include <linux/sched.h>
#include <asm/backtrace.h>
#include <asm/page.h>
#include <hv/hypervisor.h>

/* Everything we need to keep track of a backtrace iteration */
struct KBacktraceIterator {
BacktraceIterator it;
struct task_struct *task; /* task we are backtracing */
int end; /* iteration complete. */
int new_context; /* new context is starting */
int profile; /* profiling, so stop on async intrpt */
int verbose; /* printk extra info (don't want to
* do this for profiling) */
int is_current; /* backtracing current task */
};

/* Iteration methods for kernel backtraces */

/*
* Initialize a KBacktraceIterator from a task_struct, and optionally from
* a set of registers. If the registers are omitted, the process is
* assumed to be descheduled, and registers are read from the process's
* thread_struct and stack. "verbose" means to printk some additional
* information about fault handlers as we pass them on the stack.
*/
extern void KBacktraceIterator_init(struct KBacktraceIterator *kbt,
struct task_struct *, struct pt_regs *);

/* Initialize iterator based on current stack. */
extern void KBacktraceIterator_init_current(struct KBacktraceIterator *kbt);

/* Helper method for above. */
extern void _KBacktraceIterator_init_current(struct KBacktraceIterator *kbt,
ulong pc, ulong lr, ulong sp, ulong r52);

/* No more frames? */
extern int KBacktraceIterator_end(struct KBacktraceIterator *kbt);

/* Advance to the next frame. */
extern void KBacktraceIterator_next(struct KBacktraceIterator *kbt);

/*
* Dump stack given complete register info. Use only from the
* architecture-specific code; show_stack()
* and dump_stack() (in entry.S) are architecture-independent entry points.
*/
extern void tile_show_stack(struct KBacktraceIterator *, int headers);

/* Dump stack of current process, with registers to seed the backtrace. */
extern void dump_stack_regs(struct pt_regs *);

/* Helper method for assembly dump_stack(). */
extern void _dump_stack(int dummy, ulong pc, ulong lr, ulong sp, ulong r52);

#endif /* _ASM_TILE_STACK_H */