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 <linux/sched/debug.h>
  21
  22 #include <asm/backtrace.h>
  23 #include <asm/page.h>
  24 #include <hv/hypervisor.h>
  25
  26 /* Everything we need to keep track of a backtrace iteration */
  27 struct KBacktraceIterator {
  28         BacktraceIterator it;
  29         struct task_struct *task;     /* task we are backtracing */
  30         int end;                      /* iteration complete. */
  31         int new_context;              /* new context is starting */
  32         int profile;                  /* profiling, so stop on async intrpt */
  33         int verbose;                  /* printk extra info (don't want to
  34                                        * do this for profiling) */
  35         int is_current;               /* backtracing current task */
  36 };
  37
  38 /* Iteration methods for kernel backtraces */
  39
  40 /*
  41  * Initialize a KBacktraceIterator from a task_struct, and optionally from
  42  * a set of registers.  If the registers are omitted, the process is
  43  * assumed to be descheduled, and registers are read from the process's
  44  * thread_struct and stack.  "verbose" means to printk some additional
  45  * information about fault handlers as we pass them on the stack.
  46  */
  47 extern void KBacktraceIterator_init(struct KBacktraceIterator *kbt,
  48                                     struct task_struct *, struct pt_regs *);
  49
  50 /* Initialize iterator based on current stack. */
  51 extern void KBacktraceIterator_init_current(struct KBacktraceIterator *kbt);
  52
  53 /* Helper method for above. */
  54 extern void _KBacktraceIterator_init_current(struct KBacktraceIterator *kbt,
  55                                 ulong pc, ulong lr, ulong sp, ulong r52);
  56
  57 /* No more frames? */
  58 extern int KBacktraceIterator_end(struct KBacktraceIterator *kbt);
  59
  60 /* Advance to the next frame. */
  61 extern void KBacktraceIterator_next(struct KBacktraceIterator *kbt);
  62
  63 /* Dump just the contents of the pt_regs structure. */
  64 extern void tile_show_regs(struct pt_regs *);
  65
  66 /*
  67  * Dump stack given complete register info. Use only from the
  68  * architecture-specific code; show_stack()
  69  * and dump_stack() are architecture-independent entry points.
  70  */
  71 extern void tile_show_stack(struct KBacktraceIterator *);
  72
  73 #endif /* _ASM_TILE_STACK_H */