arch/arm/include/asm/unwind.h

   1 /*
   2  * arch/arm/include/asm/unwind.h
   3  *
   4  * Copyright (C) 2008 ARM Limited
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  */
  19
  20 #ifndef __ASM_UNWIND_H
  21 #define __ASM_UNWIND_H
  22
  23 #ifndef __ASSEMBLY__
  24
  25 /* Unwind reason code according the the ARM EABI documents */
  26 enum unwind_reason_code {
  27         URC_OK = 0,                     /* operation completed successfully */
  28         URC_CONTINUE_UNWIND = 8,
  29         URC_FAILURE = 9                 /* unspecified failure of some kind */
  30 };
  31
  32 struct unwind_idx {
  33         unsigned long addr;
  34         unsigned long insn;
  35 };
  36
  37 struct unwind_table {
  38         struct list_head list;
  39         struct unwind_idx *start;
  40         struct unwind_idx *stop;
  41         unsigned long begin_addr;
  42         unsigned long end_addr;
  43 };
  44
  45 extern struct unwind_table *unwind_table_add(unsigned long start,
  46                                              unsigned long size,
  47                                              unsigned long text_addr,
  48                                              unsigned long text_size);
  49 extern void unwind_table_del(struct unwind_table *tab);
  50 extern void unwind_backtrace(struct pt_regs *regs, struct task_struct *tsk);
  51
  52 #ifdef CONFIG_ARM_UNWIND
  53 extern int __init unwind_init(void);
  54 #else
  55 static inline int __init unwind_init(void)
  56 {
  57         return 0;
  58 }
  59 #endif
  60
  61 #endif  /* !__ASSEMBLY__ */
  62
  63 #ifdef CONFIG_ARM_UNWIND
  64 #define UNWIND(code...)         code
  65 #else
  66 #define UNWIND(code...)
  67 #endif
  68
  69 #endif  /* __ASM_UNWIND_H */