1/*
2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
3 *
4 *   This program is free software; you can redistribute it and/or
5 *   modify it under the terms of the GNU General Public License
6 *   as published by the Free Software Foundation, version 2.
7 *
8 *   This program is distributed in the hope that it will be useful, but
9 *   WITHOUT ANY WARRANTY; without even the implied warranty of
10 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 *   NON INFRINGEMENT.  See the GNU General Public License for
12 *   more details.
13 */
14
15#ifndef _ASM_TILE_STACK_H
16#define _ASM_TILE_STACK_H
17
18#include <linux/types.h>
19#include <linux/sched.h>
20#include <asm/backtrace.h>
21#include <asm/page.h>
22#include <hv/hypervisor.h>
23
24/* Everything we need to keep track of a backtrace iteration */
25struct KBacktraceIterator {
26	BacktraceIterator it;
27	struct task_struct *task;     /* task we are backtracing */
28	int end;		      /* iteration complete. */
29	int new_context;              /* new context is starting */
30	int profile;                  /* profiling, so stop on async intrpt */
31	int verbose;		      /* printk extra info (don't want to
32				       * do this for profiling) */
33	int is_current;               /* backtracing current task */
34};
35
36/* Iteration methods for kernel backtraces */
37
38/*
39 * Initialize a KBacktraceIterator from a task_struct, and optionally from
40 * a set of registers.  If the registers are omitted, the process is
41 * assumed to be descheduled, and registers are read from the process's
42 * thread_struct and stack.  "verbose" means to printk some additional
43 * information about fault handlers as we pass them on the stack.
44 */
45extern void KBacktraceIterator_init(struct KBacktraceIterator *kbt,
46				    struct task_struct *, struct pt_regs *);
47
48/* Initialize iterator based on current stack. */
49extern void KBacktraceIterator_init_current(struct KBacktraceIterator *kbt);
50
51/* Helper method for above. */
52extern void _KBacktraceIterator_init_current(struct KBacktraceIterator *kbt,
53				ulong pc, ulong lr, ulong sp, ulong r52);
54
55/* No more frames? */
56extern int KBacktraceIterator_end(struct KBacktraceIterator *kbt);
57
58/* Advance to the next frame. */
59extern void KBacktraceIterator_next(struct KBacktraceIterator *kbt);
60
61/*
62 * Dump stack given complete register info. Use only from the
63 * architecture-specific code; show_stack()
64 * and dump_stack() (in entry.S) are architecture-independent entry points.
65 */
66extern void tile_show_stack(struct KBacktraceIterator *, int headers);
67
68/* Dump stack of current process, with registers to seed the backtrace. */
69extern void dump_stack_regs(struct pt_regs *);
70
71/* Helper method for assembly dump_stack(). */
72extern void _dump_stack(int dummy, ulong pc, ulong lr, ulong sp, ulong r52);
73
74#endif /* _ASM_TILE_STACK_H */
75