LXR linux/arch/tile/include/asm/stack.h

   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/* Dump just the contents of the pt_regs structure. */
  62extern void tile_show_regs(struct pt_regs *);
  63
  64/*
  65 * Dump stack given complete register info. Use only from the
  66 * architecture-specific code; show_stack()
  67 * and dump_stack() are architecture-independent entry points.
  68 */
  69extern void tile_show_stack(struct KBacktraceIterator *);
  70
  71#endif /* _ASM_TILE_STACK_H */
  72