include/tdep-arm/libunwind_i.h - platform/external/libunwind - Git at Google

 /* libunwind - a platform-independent unwind library
    Copyright (C) 2008 CodeSourcery

 This file is part of libunwind.

 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the
 "Software"), to deal in the Software without restriction, including
 without limitation the rights to use, copy, modify, merge, publish,
 distribute, sublicense, and/or sell copies of the Software, and to
 permit persons to whom the Software is furnished to do so, subject to
 the following conditions:

 The above copyright notice and this permission notice shall be
 included in all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.  */

 #ifndef ARM_LIBUNWIND_I_H
 #define ARM_LIBUNWIND_I_H

 /* Target-dependent definitions that are internal to libunwind but need
    to be shared with target-independent code.  */

 #include <stdlib.h>
 #include <libunwind.h>

 #include "elf32.h"
 /* ANDROID support update. */
 #include "map_info.h"
 /* End of ANDROID update. */
 #include "mempool.h"
 #include "dwarf.h"
 #include "ex_tables.h"

 typedef struct
   {
     /* no arm-specific fast trace */
   }
 unw_tdep_frame_t;

 struct unw_addr_space
   {
     struct unw_accessors acc;
     int big_endian;
     unw_caching_policy_t caching_policy;
 #ifdef HAVE_ATOMIC_OPS_H
     AO_t cache_generation;
 #else
     uint32_t cache_generation;
 #endif
     unw_word_t dyn_generation;		/* see dyn-common.h */
     unw_word_t dyn_info_list_addr;	/* (cached) dyn_info_list_addr */
     struct dwarf_rs_cache global_cache;
     struct unw_debug_frame_list *debug_frames;
     /* ANDROID support update. */
     struct map_info *map_list;
     /* End of ANDROID update. */
   };

 struct cursor
   {
     struct dwarf_cursor dwarf;		/* must be first */
     enum
       {
         ARM_SCF_NONE,                   /* no signal frame */
         ARM_SCF_LINUX_SIGFRAME,         /* non-RT signal frame, kernel >=2.6.18 */
         ARM_SCF_LINUX_RT_SIGFRAME,      /* RT signal frame, kernel >=2.6.18 */
         ARM_SCF_LINUX_OLD_SIGFRAME,     /* non-RT signal frame, kernel < 2.6.18 */
         ARM_SCF_LINUX_OLD_RT_SIGFRAME   /* RT signal frame, kernel < 2.6.18 */
       }
     sigcontext_format;
     unw_word_t sigcontext_addr;
     unw_word_t sigcontext_sp;
     unw_word_t sigcontext_pc;
   };

 #define DWARF_GET_LOC(l)	((l).val)

 #ifdef UNW_LOCAL_ONLY
 # define DWARF_NULL_LOC		DWARF_LOC (0, 0)
 # define DWARF_IS_NULL_LOC(l)	(DWARF_GET_LOC (l) == 0)
 # define DWARF_LOC(r, t)	((dwarf_loc_t) { .val = (r) })
 # define DWARF_IS_REG_LOC(l)	0
 # define DWARF_REG_LOC(c,r)	(DWARF_LOC((unw_word_t)			     \
 				 tdep_uc_addr((c)->as_arg, (r)), 0))
 # define DWARF_MEM_LOC(c,m)	DWARF_LOC ((m), 0)
 # define DWARF_FPREG_LOC(c,r)	(DWARF_LOC((unw_word_t)			     \
 				 tdep_uc_addr((c)->as_arg, (r)), 0))

 static inline int
 dwarf_getfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t *val)
 {
 /* ANDROID support update. */
   unw_fpreg_t *addr = (unw_fpreg_t *) (uintptr_t) DWARF_GET_LOC (loc);
   if (!addr || !map_local_is_readable ((unw_word_t) (uintptr_t) addr, sizeof(unw_fpreg_t)))
     return -1;

   *val = *addr;
   return 0;
 /* End of ANDROID update. */
 }

 static inline int
 dwarf_putfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t val)
 {
 /* ANDROID support update. */
   unw_fpreg_t *addr = (unw_fpreg_t *) (uintptr_t) DWARF_GET_LOC (loc);
   if (!addr || !map_local_is_writable ((unw_word_t) (uintptr_t) addr, sizeof(unw_fpreg_t)))
     return -1;

   *addr = val;
   return 0;
 /* End of ANDROID update. */
 }

 static inline int
 dwarf_get (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t *val)
 {
 /* ANDROID support update. */
   if (!DWARF_GET_LOC (loc))
     return -1;
   return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), val,
 				   0, c->as_arg);
 /* End of ANDROID update. */
 }

 static inline int
 dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
 {
 /* ANDROID support update. */
   if (!DWARF_GET_LOC (loc))
     return -1;
   return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), &val,
 				   1, c->as_arg);
 /* End of ANDROID update. */
 }

 #else /* !UNW_LOCAL_ONLY */
 # define DWARF_LOC_TYPE_FP	(1 << 0)
 # define DWARF_LOC_TYPE_REG	(1 << 1)
 # define DWARF_NULL_LOC		DWARF_LOC (0, 0)
 # define DWARF_IS_NULL_LOC(l)						\
 		({ dwarf_loc_t _l = (l); _l.val == 0 && _l.type == 0; })
 # define DWARF_LOC(r, t)	((dwarf_loc_t) { .val = (r), .type = (t) })
 # define DWARF_IS_REG_LOC(l)	(((l).type & DWARF_LOC_TYPE_REG) != 0)
 # define DWARF_IS_FP_LOC(l)	(((l).type & DWARF_LOC_TYPE_FP) != 0)
 # define DWARF_REG_LOC(c,r)	DWARF_LOC((r), DWARF_LOC_TYPE_REG)
 # define DWARF_MEM_LOC(c,m)	DWARF_LOC ((m), 0)
 # define DWARF_FPREG_LOC(c,r)	DWARF_LOC((r), (DWARF_LOC_TYPE_REG	\
 						| DWARF_LOC_TYPE_FP))

 static inline int
 dwarf_getfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t *val)
 {
   char *valp = (char *) &val;
   unw_word_t addr;
   int ret;

   if (DWARF_IS_NULL_LOC (loc))
     return -UNW_EBADREG;

   if (DWARF_IS_REG_LOC (loc))
     return (*c->as->acc.access_fpreg) (c->as, DWARF_GET_LOC (loc),
 				       val, 0, c->as_arg);

   addr = DWARF_GET_LOC (loc);
   if ((ret = (*c->as->acc.access_mem) (c->as, addr + 0, (unw_word_t *) valp,
 				       0, c->as_arg)) < 0)
     return ret;

   return (*c->as->acc.access_mem) (c->as, addr + 4, (unw_word_t *) valp + 1, 0,
 				   c->as_arg);
 }

 static inline int
 dwarf_putfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t val)
 {
   char *valp = (char *) &val;
   unw_word_t addr;
   int ret;

   if (DWARF_IS_NULL_LOC (loc))
     return -UNW_EBADREG;

   if (DWARF_IS_REG_LOC (loc))
     return (*c->as->acc.access_fpreg) (c->as, DWARF_GET_LOC (loc),
 				       &val, 1, c->as_arg);

   addr = DWARF_GET_LOC (loc);
   if ((ret = (*c->as->acc.access_mem) (c->as, addr + 0, (unw_word_t *) valp,
 				       1, c->as_arg)) < 0)
     return ret;

   return (*c->as->acc.access_mem) (c->as, addr + 4, (unw_word_t *) valp + 1,
 				   1, c->as_arg);
 }

 static inline int
 dwarf_get (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t *val)
 {
   if (DWARF_IS_NULL_LOC (loc))
     return -UNW_EBADREG;

   /* If a code-generator were to save a value of type unw_word_t in a
      floating-point register, we would have to support this case.  I
      suppose it could happen with MMX registers, but does it really
      happen?  */
   assert (!DWARF_IS_FP_LOC (loc));

   if (DWARF_IS_REG_LOC (loc))
     return (*c->as->acc.access_reg) (c->as, DWARF_GET_LOC (loc), val,
 				     0, c->as_arg);
   else
     return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), val,
 				     0, c->as_arg);
 }

 static inline int
 dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
 {
   if (DWARF_IS_NULL_LOC (loc))
     return -UNW_EBADREG;

   /* If a code-generator were to save a value of type unw_word_t in a
      floating-point register, we would have to support this case.  I
      suppose it could happen with MMX registers, but does it really
      happen?  */
   assert (!DWARF_IS_FP_LOC (loc));

   if (DWARF_IS_REG_LOC (loc))
     return (*c->as->acc.access_reg) (c->as, DWARF_GET_LOC (loc), &val,
 				     1, c->as_arg);
   else
     return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), &val,
 				     1, c->as_arg);
 }

 #endif /* !UNW_LOCAL_ONLY */

 #define tdep_getcontext_trace           unw_getcontext
 #define tdep_init_done			UNW_OBJ(init_done)
 #define tdep_init			UNW_OBJ(init)
 #define arm_find_proc_info		UNW_OBJ(find_proc_info)
 #define arm_put_unwind_info		UNW_OBJ(put_unwind_info)
 /* Platforms that support UNW_INFO_FORMAT_TABLE need to define
    tdep_search_unwind_table.  */
 #define tdep_search_unwind_table	UNW_OBJ(search_unwind_table)
 #define tdep_find_unwind_table		dwarf_find_unwind_table
 #define tdep_uc_addr			UNW_ARCH_OBJ(uc_addr)
 #define tdep_get_elf_image		UNW_ARCH_OBJ(get_elf_image)
 #define tdep_access_reg			UNW_OBJ(access_reg)
 #define tdep_access_fpreg		UNW_OBJ(access_fpreg)
 #define tdep_fetch_frame(c,ip,n)	do {} while(0)
 #define tdep_cache_frame(c,rs)		do {} while(0)
 #define tdep_reuse_frame(c,rs)		do {} while(0)
 #define tdep_stash_frame(c,rs)		do {} while(0)
 #define tdep_trace(cur,addr,n)		(-UNW_ENOINFO)

 #ifdef UNW_LOCAL_ONLY
 # define tdep_find_proc_info(c,ip,n)				\
 	arm_find_proc_info((c)->as, (ip), &(c)->pi, (n),	\
 				       (c)->as_arg)
 # define tdep_put_unwind_info(as,pi,arg)		\
 	arm_put_unwind_info((as), (pi), (arg))
 #else
 # define tdep_find_proc_info(c,ip,n)					\
 	(*(c)->as->acc.find_proc_info)((c)->as, (ip), &(c)->pi, (n),	\
 				       (c)->as_arg)
 # define tdep_put_unwind_info(as,pi,arg)		\
 	(*(as)->acc.put_unwind_info)((as), (pi), (arg))
 #endif

 #define tdep_get_as(c)			((c)->dwarf.as)
 #define tdep_get_as_arg(c)		((c)->dwarf.as_arg)
 #define tdep_get_ip(c)			((c)->dwarf.ip)
 #define tdep_big_endian(as)		((as)->big_endian)

 extern int tdep_init_done;

 extern void tdep_init (void);
 extern int arm_find_proc_info (unw_addr_space_t as, unw_word_t ip,
 			       unw_proc_info_t *pi, int need_unwind_info,
 			       void *arg);
 extern void arm_put_unwind_info (unw_addr_space_t as,
 				  unw_proc_info_t *pi, void *arg);
 extern int tdep_search_unwind_table (unw_addr_space_t as, unw_word_t ip,
 				     unw_dyn_info_t *di, unw_proc_info_t *pi,
 				     int need_unwind_info, void *arg);
 extern void *tdep_uc_addr (unw_tdep_context_t *uc, int reg);
 /* ANDROID support update. */
 extern int tdep_get_elf_image (unw_addr_space_t as, struct elf_image *ei,
 			       pid_t pid, unw_word_t ip,
 			       unsigned long *segbase, unsigned long *mapoff,
 			       char **path, void *as_arg);
 /* End of ANDROID update. */
 extern int tdep_access_reg (struct cursor *c, unw_regnum_t reg,
 			    unw_word_t *valp, int write);
 extern int tdep_access_fpreg (struct cursor *c, unw_regnum_t reg,
 			      unw_fpreg_t *valp, int write);

 /* unwinding method selection support */
 #define UNW_ARM_METHOD_ALL          0xFF
 #define UNW_ARM_METHOD_DWARF        0x01
 #define UNW_ARM_METHOD_FRAME        0x02
 #define UNW_ARM_METHOD_EXIDX        0x04
 /* ANDROID support update. */
 #define UNW_ARM_METHOD_LR           0x08
 /* End of ANDROID update. */

 #define unwi_unwind_method   UNW_OBJ(unwind_method)
 extern int unwi_unwind_method;

 #define UNW_TRY_METHOD(x)   (unwi_unwind_method & x)

 #endif /* ARM_LIBUNWIND_I_H */
	/* libunwind - a platform-independent unwind library
	Copyright (C) 2008 CodeSourcery

	This file is part of libunwind.

	Permission is hereby granted, free of charge, to any person obtaining
	a copy of this software and associated documentation files (the
	"Software"), to deal in the Software without restriction, including
	without limitation the rights to use, copy, modify, merge, publish,
	distribute, sublicense, and/or sell copies of the Software, and to
	permit persons to whom the Software is furnished to do so, subject to
	the following conditions:

	The above copyright notice and this permission notice shall be
	included in all copies or substantial portions of the Software.

	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
	LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
	OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
	WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */

	#ifndef ARM_LIBUNWIND_I_H
	#define ARM_LIBUNWIND_I_H

	/* Target-dependent definitions that are internal to libunwind but need
	to be shared with target-independent code. */

	#include <stdlib.h>
	#include <libunwind.h>

	#include "elf32.h"
	/* ANDROID support update. */
	#include "map_info.h"
	/* End of ANDROID update. */
	#include "mempool.h"
	#include "dwarf.h"
	#include "ex_tables.h"

	typedef struct
	{
	/* no arm-specific fast trace */
	}
	unw_tdep_frame_t;

	struct unw_addr_space
	{
	struct unw_accessors acc;
	int big_endian;
	unw_caching_policy_t caching_policy;
	#ifdef HAVE_ATOMIC_OPS_H
	AO_t cache_generation;
	#else
	uint32_t cache_generation;
	#endif
	unw_word_t dyn_generation; /* see dyn-common.h */
	unw_word_t dyn_info_list_addr; /* (cached) dyn_info_list_addr */
	struct dwarf_rs_cache global_cache;
	struct unw_debug_frame_list *debug_frames;
	/* ANDROID support update. */
	struct map_info *map_list;
	/* End of ANDROID update. */
	};

	struct cursor
	{
	struct dwarf_cursor dwarf; /* must be first */
	enum
	{
	ARM_SCF_NONE, /* no signal frame */
	ARM_SCF_LINUX_SIGFRAME, /* non-RT signal frame, kernel >=2.6.18 */
	ARM_SCF_LINUX_RT_SIGFRAME, /* RT signal frame, kernel >=2.6.18 */
	ARM_SCF_LINUX_OLD_SIGFRAME, /* non-RT signal frame, kernel < 2.6.18 */
	ARM_SCF_LINUX_OLD_RT_SIGFRAME /* RT signal frame, kernel < 2.6.18 */
	}
	sigcontext_format;
	unw_word_t sigcontext_addr;
	unw_word_t sigcontext_sp;
	unw_word_t sigcontext_pc;
	};

	#define DWARF_GET_LOC(l) ((l).val)

	#ifdef UNW_LOCAL_ONLY
	# define DWARF_NULL_LOC DWARF_LOC (0, 0)
	# define DWARF_IS_NULL_LOC(l) (DWARF_GET_LOC (l) == 0)
	# define DWARF_LOC(r, t) ((dwarf_loc_t) { .val = (r) })
	# define DWARF_IS_REG_LOC(l) 0
	# define DWARF_REG_LOC(c,r) (DWARF_LOC((unw_word_t) \
	tdep_uc_addr((c)->as_arg, (r)), 0))
	# define DWARF_MEM_LOC(c,m) DWARF_LOC ((m), 0)
	# define DWARF_FPREG_LOC(c,r) (DWARF_LOC((unw_word_t) \
	tdep_uc_addr((c)->as_arg, (r)), 0))

	static inline int
	dwarf_getfp (struct dwarf_cursor c, dwarf_loc_t loc, unw_fpreg_t val)
	{
	/* ANDROID support update. */
	unw_fpreg_t addr = (unw_fpreg_t ) (uintptr_t) DWARF_GET_LOC (loc);
	if (!addr \|\| !map_local_is_readable ((unw_word_t) (uintptr_t) addr, sizeof(unw_fpreg_t)))
	return -1;

	val = addr;
	return 0;
	/* End of ANDROID update. */
	}

	static inline int
	dwarf_putfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t val)
	{
	/* ANDROID support update. */
	unw_fpreg_t addr = (unw_fpreg_t ) (uintptr_t) DWARF_GET_LOC (loc);
	if (!addr \|\| !map_local_is_writable ((unw_word_t) (uintptr_t) addr, sizeof(unw_fpreg_t)))
	return -1;

	*addr = val;
	return 0;
	/* End of ANDROID update. */
	}

	static inline int
	dwarf_get (struct dwarf_cursor c, dwarf_loc_t loc, unw_word_t val)
	{
	/* ANDROID support update. */
	if (!DWARF_GET_LOC (loc))
	return -1;
	return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), val,
	0, c->as_arg);
	/* End of ANDROID update. */
	}

	static inline int
	dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
	{
	/* ANDROID support update. */
	if (!DWARF_GET_LOC (loc))
	return -1;
	return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), &val,
	1, c->as_arg);
	/* End of ANDROID update. */
	}

	#else /* !UNW_LOCAL_ONLY */
	# define DWARF_LOC_TYPE_FP (1 << 0)
	# define DWARF_LOC_TYPE_REG (1 << 1)
	# define DWARF_NULL_LOC DWARF_LOC (0, 0)
	# define DWARF_IS_NULL_LOC(l) \
	({ dwarf_loc_t _l = (l); _l.val == 0 && _l.type == 0; })
	# define DWARF_LOC(r, t) ((dwarf_loc_t) { .val = (r), .type = (t) })
	# define DWARF_IS_REG_LOC(l) (((l).type & DWARF_LOC_TYPE_REG) != 0)
	# define DWARF_IS_FP_LOC(l) (((l).type & DWARF_LOC_TYPE_FP) != 0)
	# define DWARF_REG_LOC(c,r) DWARF_LOC((r), DWARF_LOC_TYPE_REG)
	# define DWARF_MEM_LOC(c,m) DWARF_LOC ((m), 0)
	# define DWARF_FPREG_LOC(c,r) DWARF_LOC((r), (DWARF_LOC_TYPE_REG \
	\| DWARF_LOC_TYPE_FP))

	static inline int
	dwarf_getfp (struct dwarf_cursor c, dwarf_loc_t loc, unw_fpreg_t val)
	{
	char valp = (char ) &val;
	unw_word_t addr;
	int ret;

	if (DWARF_IS_NULL_LOC (loc))
	return -UNW_EBADREG;

	if (DWARF_IS_REG_LOC (loc))
	return (*c->as->acc.access_fpreg) (c->as, DWARF_GET_LOC (loc),
	val, 0, c->as_arg);

	addr = DWARF_GET_LOC (loc);
	if ((ret = (c->as->acc.access_mem) (c->as, addr + 0, (unw_word_t ) valp,
	0, c->as_arg)) < 0)
	return ret;

	return (c->as->acc.access_mem) (c->as, addr + 4, (unw_word_t ) valp + 1, 0,
	c->as_arg);
	}

	static inline int
	dwarf_putfp (struct dwarf_cursor *c, dwarf_loc_t loc, unw_fpreg_t val)
	{
	char valp = (char ) &val;
	unw_word_t addr;
	int ret;

	if (DWARF_IS_NULL_LOC (loc))
	return -UNW_EBADREG;

	if (DWARF_IS_REG_LOC (loc))
	return (*c->as->acc.access_fpreg) (c->as, DWARF_GET_LOC (loc),
	&val, 1, c->as_arg);

	addr = DWARF_GET_LOC (loc);
	if ((ret = (c->as->acc.access_mem) (c->as, addr + 0, (unw_word_t ) valp,
	1, c->as_arg)) < 0)
	return ret;

	return (c->as->acc.access_mem) (c->as, addr + 4, (unw_word_t ) valp + 1,
	1, c->as_arg);
	}

	static inline int
	dwarf_get (struct dwarf_cursor c, dwarf_loc_t loc, unw_word_t val)
	{
	if (DWARF_IS_NULL_LOC (loc))
	return -UNW_EBADREG;

	/* If a code-generator were to save a value of type unw_word_t in a
	floating-point register, we would have to support this case. I
	suppose it could happen with MMX registers, but does it really
	happen? */
	assert (!DWARF_IS_FP_LOC (loc));

	if (DWARF_IS_REG_LOC (loc))
	return (*c->as->acc.access_reg) (c->as, DWARF_GET_LOC (loc), val,
	0, c->as_arg);
	else
	return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), val,
	0, c->as_arg);
	}

	static inline int
	dwarf_put (struct dwarf_cursor *c, dwarf_loc_t loc, unw_word_t val)
	{
	if (DWARF_IS_NULL_LOC (loc))
	return -UNW_EBADREG;

	/* If a code-generator were to save a value of type unw_word_t in a
	floating-point register, we would have to support this case. I
	suppose it could happen with MMX registers, but does it really
	happen? */
	assert (!DWARF_IS_FP_LOC (loc));

	if (DWARF_IS_REG_LOC (loc))
	return (*c->as->acc.access_reg) (c->as, DWARF_GET_LOC (loc), &val,
	1, c->as_arg);
	else
	return (*c->as->acc.access_mem) (c->as, DWARF_GET_LOC (loc), &val,
	1, c->as_arg);
	}

	#endif /* !UNW_LOCAL_ONLY */

	#define tdep_getcontext_trace unw_getcontext
	#define tdep_init_done UNW_OBJ(init_done)
	#define tdep_init UNW_OBJ(init)
	#define arm_find_proc_info UNW_OBJ(find_proc_info)
	#define arm_put_unwind_info UNW_OBJ(put_unwind_info)
	/* Platforms that support UNW_INFO_FORMAT_TABLE need to define
	tdep_search_unwind_table. */
	#define tdep_search_unwind_table UNW_OBJ(search_unwind_table)
	#define tdep_find_unwind_table dwarf_find_unwind_table
	#define tdep_uc_addr UNW_ARCH_OBJ(uc_addr)
	#define tdep_get_elf_image UNW_ARCH_OBJ(get_elf_image)
	#define tdep_access_reg UNW_OBJ(access_reg)
	#define tdep_access_fpreg UNW_OBJ(access_fpreg)
	#define tdep_fetch_frame(c,ip,n) do {} while(0)
	#define tdep_cache_frame(c,rs) do {} while(0)
	#define tdep_reuse_frame(c,rs) do {} while(0)
	#define tdep_stash_frame(c,rs) do {} while(0)
	#define tdep_trace(cur,addr,n) (-UNW_ENOINFO)

	#ifdef UNW_LOCAL_ONLY
	# define tdep_find_proc_info(c,ip,n) \
	arm_find_proc_info((c)->as, (ip), &(c)->pi, (n), \
	(c)->as_arg)
	# define tdep_put_unwind_info(as,pi,arg) \
	arm_put_unwind_info((as), (pi), (arg))
	#else
	# define tdep_find_proc_info(c,ip,n) \
	(*(c)->as->acc.find_proc_info)((c)->as, (ip), &(c)->pi, (n), \
	(c)->as_arg)
	# define tdep_put_unwind_info(as,pi,arg) \
	(*(as)->acc.put_unwind_info)((as), (pi), (arg))
	#endif

	#define tdep_get_as(c) ((c)->dwarf.as)
	#define tdep_get_as_arg(c) ((c)->dwarf.as_arg)
	#define tdep_get_ip(c) ((c)->dwarf.ip)
	#define tdep_big_endian(as) ((as)->big_endian)

	extern int tdep_init_done;

	extern void tdep_init (void);
	extern int arm_find_proc_info (unw_addr_space_t as, unw_word_t ip,
	unw_proc_info_t *pi, int need_unwind_info,
	void *arg);
	extern void arm_put_unwind_info (unw_addr_space_t as,
	unw_proc_info_t pi, void arg);
	extern int tdep_search_unwind_table (unw_addr_space_t as, unw_word_t ip,
	unw_dyn_info_t di, unw_proc_info_t pi,
	int need_unwind_info, void *arg);
	extern void tdep_uc_addr (unw_tdep_context_t uc, int reg);
	/* ANDROID support update. */
	extern int tdep_get_elf_image (unw_addr_space_t as, struct elf_image *ei,
	pid_t pid, unw_word_t ip,
	unsigned long segbase, unsigned long mapoff,
	char *path, void as_arg);
	/* End of ANDROID update. */
	extern int tdep_access_reg (struct cursor *c, unw_regnum_t reg,
	unw_word_t *valp, int write);
	extern int tdep_access_fpreg (struct cursor *c, unw_regnum_t reg,
	unw_fpreg_t *valp, int write);

	/* unwinding method selection support */
	#define UNW_ARM_METHOD_ALL 0xFF
	#define UNW_ARM_METHOD_DWARF 0x01
	#define UNW_ARM_METHOD_FRAME 0x02
	#define UNW_ARM_METHOD_EXIDX 0x04
	/* ANDROID support update. */
	#define UNW_ARM_METHOD_LR 0x08
	/* End of ANDROID update. */

	#define unwi_unwind_method UNW_OBJ(unwind_method)
	extern int unwi_unwind_method;

	#define UNW_TRY_METHOD(x) (unwi_unwind_method & x)

	#endif /* ARM_LIBUNWIND_I_H */