unwind.h: Move to libc/sysdeps from nptl sysdeps

Signed-off-by: Khem Raj <raj.khem@gmail.com>

2 files changed, 499 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/arm/unwind.h b/libc/sysdeps/linux/arm/unwind.h
new file mode 100644
index 000000000..eeb9cf8b6
--- /dev/null
+++ b/libc/sysdeps/linux/arm/unwind.h
@@ -0,0 +1,279 @@
+/* Header file for the ARM EABI unwinder
+   Copyright (C) 2003, 2004, 2005, 2009  Free Software Foundation, Inc.
+   Contributed by Paul Brook
+
+   This file is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by the
+   Free Software Foundation; either version 2, or (at your option) any
+   later version.
+
+   In addition to the permissions in the GNU General Public License, the
+   Free Software Foundation gives you unlimited permission to link the
+   compiled version of this file into combinations with other programs,
+   and to distribute those combinations without any restriction coming
+   from the use of this file.  (The General Public License restrictions
+   do apply in other respects; for example, they cover modification of
+   the file, and distribution when not linked into a combine
+   executable.)
+
+   This file is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; see the file COPYING.  If not, write to
+   the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.  */
+
+/* Language-independent unwinder header public defines.  This contains both
+   ABI defined objects, and GNU support routines.  */
+
+#ifndef UNWIND_ARM_H
+#define UNWIND_ARM_H
+
+#define __ARM_EABI_UNWINDER__ 1
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+  typedef unsigned _Unwind_Word __attribute__((__mode__(__word__)));
+  typedef signed _Unwind_Sword __attribute__((__mode__(__word__)));
+  typedef unsigned _Unwind_Ptr __attribute__((__mode__(__pointer__)));
+  typedef unsigned _Unwind_Internal_Ptr __attribute__((__mode__(__pointer__)));
+  typedef _Unwind_Word _uw;
+  typedef unsigned _uw64 __attribute__((mode(__DI__)));
+  typedef unsigned _uw16 __attribute__((mode(__HI__)));
+  typedef unsigned _uw8 __attribute__((mode(__QI__)));
+
+  typedef enum
+    {
+      _URC_OK = 0,       /* operation completed successfully */
+      _URC_FOREIGN_EXCEPTION_CAUGHT = 1,
+      _URC_END_OF_STACK = 5,
+      _URC_HANDLER_FOUND = 6,
+      _URC_INSTALL_CONTEXT = 7,
+      _URC_CONTINUE_UNWIND = 8,
+      _URC_FAILURE = 9   /* unspecified failure of some kind */
+    }
+  _Unwind_Reason_Code;
+
+  typedef enum
+    {
+      _US_VIRTUAL_UNWIND_FRAME = 0,
+      _US_UNWIND_FRAME_STARTING = 1,
+      _US_UNWIND_FRAME_RESUME = 2,
+      _US_ACTION_MASK = 3,
+      _US_FORCE_UNWIND = 8,
+      _US_END_OF_STACK = 16
+    }
+  _Unwind_State;
+
+  /* Provided only for for compatibility with existing code.  */
+  typedef int _Unwind_Action;
+#define _UA_SEARCH_PHASE	1
+#define _UA_CLEANUP_PHASE	2
+#define _UA_HANDLER_FRAME	4
+#define _UA_FORCE_UNWIND	8
+#define _UA_END_OF_STACK	16
+#define _URC_NO_REASON 	_URC_OK
+
+  typedef struct _Unwind_Control_Block _Unwind_Control_Block;
+  typedef struct _Unwind_Context _Unwind_Context;
+  typedef _uw _Unwind_EHT_Header;
+
+
+  /* UCB: */
+
+  struct _Unwind_Control_Block
+    {
+#ifdef _LIBC
+      /* For the benefit of code which assumes this is a scalar.  All
+	 glibc ever does is clear it.  */
+      _uw64 exception_class;
+#else
+      char exception_class[8];
+#endif
+      void (*exception_cleanup)(_Unwind_Reason_Code, _Unwind_Control_Block *);
+      /* Unwinder cache, private fields for the unwinder's use */
+      struct
+	{
+	  _uw reserved1;  /* Forced unwind stop fn, 0 if not forced */
+	  _uw reserved2;  /* Personality routine address */
+	  _uw reserved3;  /* Saved callsite address */
+	  _uw reserved4;  /* Forced unwind stop arg */
+	  _uw reserved5;
+	}
+      unwinder_cache;
+      /* Propagation barrier cache (valid after phase 1): */
+      struct
+	{
+	  _uw sp;
+	  _uw bitpattern[5];
+	}
+      barrier_cache;
+      /* Cleanup cache (preserved over cleanup): */
+      struct
+	{
+	  _uw bitpattern[4];
+	}
+      cleanup_cache;
+      /* Pr cache (for pr's benefit): */
+      struct
+	{
+	  _uw fnstart;			/* function start address */
+	  _Unwind_EHT_Header *ehtp;	/* pointer to EHT entry header word */
+	  _uw additional;		/* additional data */
+	  _uw reserved1;
+	}
+      pr_cache;
+      long long int :0;	/* Force alignment to 8-byte boundary */
+    };
+
+  /* Virtual Register Set*/
+
+  typedef enum
+    {
+      _UVRSC_CORE = 0,      /* integer register */
+      _UVRSC_VFP = 1,       /* vfp */
+      _UVRSC_FPA = 2,       /* fpa */
+      _UVRSC_WMMXD = 3,     /* Intel WMMX data register */
+      _UVRSC_WMMXC = 4      /* Intel WMMX control register */
+    }
+  _Unwind_VRS_RegClass;
+
+  typedef enum
+    {
+      _UVRSD_UINT32 = 0,
+      _UVRSD_VFPX = 1,
+      _UVRSD_FPAX = 2,
+      _UVRSD_UINT64 = 3,
+      _UVRSD_FLOAT = 4,
+      _UVRSD_DOUBLE = 5
+    }
+  _Unwind_VRS_DataRepresentation;
+
+  typedef enum
+    {
+      _UVRSR_OK = 0,
+      _UVRSR_NOT_IMPLEMENTED = 1,
+      _UVRSR_FAILED = 2
+    }
+  _Unwind_VRS_Result;
+
+  /* Frame unwinding state.  */
+  typedef struct
+    {
+      /* The current word (bytes packed msb first).  */
+      _uw data;
+      /* Pointer to the next word of data.  */
+      _uw *next;
+      /* The number of bytes left in this word.  */
+      _uw8 bytes_left;
+      /* The number of words pointed to by ptr.  */
+      _uw8 words_left;
+    }
+  __gnu_unwind_state;
+
+  typedef _Unwind_Reason_Code (*personality_routine) (_Unwind_State,
+      _Unwind_Control_Block *, _Unwind_Context *);
+
+  _Unwind_VRS_Result _Unwind_VRS_Set(_Unwind_Context *, _Unwind_VRS_RegClass,
+                                     _uw, _Unwind_VRS_DataRepresentation,
+                                     void *);
+
+  _Unwind_VRS_Result _Unwind_VRS_Get(_Unwind_Context *, _Unwind_VRS_RegClass,
+                                     _uw, _Unwind_VRS_DataRepresentation,
+                                     void *);
+
+  _Unwind_VRS_Result _Unwind_VRS_Pop(_Unwind_Context *, _Unwind_VRS_RegClass,
+                                     _uw, _Unwind_VRS_DataRepresentation);
+
+
+  /* Support functions for the PR.  */
+#define _Unwind_Exception _Unwind_Control_Block
+  typedef char _Unwind_Exception_Class[8];
+
+  void * _Unwind_GetLanguageSpecificData (_Unwind_Context *);
+  _Unwind_Ptr _Unwind_GetRegionStart (_Unwind_Context *);
+
+  /* These two should never be used.  */
+  _Unwind_Ptr _Unwind_GetDataRelBase (_Unwind_Context *);
+  _Unwind_Ptr _Unwind_GetTextRelBase (_Unwind_Context *);
+
+  /* Interface functions: */
+  _Unwind_Reason_Code _Unwind_RaiseException(_Unwind_Control_Block *ucbp);
+  void __attribute__((noreturn)) _Unwind_Resume(_Unwind_Control_Block *ucbp);
+  _Unwind_Reason_Code _Unwind_Resume_or_Rethrow (_Unwind_Control_Block *ucbp);
+
+  typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)
+       (int, _Unwind_Action, _Unwind_Exception_Class,
+	_Unwind_Control_Block *, struct _Unwind_Context *, void *);
+  _Unwind_Reason_Code _Unwind_ForcedUnwind (_Unwind_Control_Block *,
+					    _Unwind_Stop_Fn, void *);
+  _Unwind_Word _Unwind_GetCFA (struct _Unwind_Context *);
+  void _Unwind_Complete(_Unwind_Control_Block *ucbp);
+  void _Unwind_DeleteException (_Unwind_Exception *);
+
+  _Unwind_Reason_Code __gnu_unwind_frame (_Unwind_Control_Block *,
+					  _Unwind_Context *);
+  _Unwind_Reason_Code __gnu_unwind_execute (_Unwind_Context *,
+					    __gnu_unwind_state *);
+
+  /* Decode an R_ARM_TARGET2 relocation.  */
+  static inline _Unwind_Word
+  _Unwind_decode_target2 (_Unwind_Word ptr)
+    {
+      _Unwind_Word tmp;
+
+      tmp = *(_Unwind_Word *) ptr;
+      /* Zero values are always NULL.  */
+      if (!tmp)
+	return 0;
+
+#if defined(linux) || defined(__NetBSD__)
+      /* Pc-relative indirect.  */
+      tmp += ptr;
+      tmp = *(_Unwind_Word *) tmp;
+#elif defined(__symbian__)
+      /* Absolute pointer.  Nothing more to do.  */
+#else
+      /* Pc-relative pointer.  */
+      tmp += ptr;
+#endif
+      return tmp;
+    }
+
+  static inline _Unwind_Word
+  _Unwind_GetGR (_Unwind_Context *context, int regno)
+    {
+      _uw val;
+      _Unwind_VRS_Get (context, _UVRSC_CORE, regno, _UVRSD_UINT32, &val);
+      return val;
+    }
+
+  /* Return the address of the instruction, not the actual IP value.  */
+#define _Unwind_GetIP(context) \
+  (_Unwind_GetGR (context, 15) & ~(_Unwind_Word)1)
+
+  static inline void
+  _Unwind_SetGR (_Unwind_Context *context, int regno, _Unwind_Word val)
+    {
+      _Unwind_VRS_Set (context, _UVRSC_CORE, regno, _UVRSD_UINT32, &val);
+    }
+
+  /* The dwarf unwinder doesn't understand arm/thumb state.  We assume the
+     landing pad uses the same instruction set as the call site.  */
+#define _Unwind_SetIP(context, val) \
+  _Unwind_SetGR (context, 15, val | (_Unwind_GetGR (context, 15) & 1))
+
+typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn)
+     (struct _Unwind_Context *, void *);
+
+extern _Unwind_Reason_Code _Unwind_Backtrace (_Unwind_Trace_Fn, void *);
+
+#ifdef __cplusplus
+}   /* extern "C" */
+#endif
+
+#endif /* defined UNWIND_ARM_H */
diff --git a/libc/sysdeps/linux/common/unwind.h b/libc/sysdeps/linux/common/unwind.h
new file mode 100644
index 000000000..81fc4db55
--- /dev/null
+++ b/libc/sysdeps/linux/common/unwind.h
@@ -0,0 +1,220 @@
+/* Exception handling and frame unwind runtime interface routines.
+   Copyright (C) 2001, 2003 Free Software Foundation, Inc.
+
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+/* This is derived from the C++ ABI for IA-64.  Where we diverge
+   for cross-architecture compatibility are noted with "@@@".  */
+
+#ifndef _UNWIND_H
+#define _UNWIND_H	1
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Level 1: Base ABI  */
+
+/* @@@ The IA-64 ABI uses uint64 throughout.  Most places this is
+   inefficient for 32-bit and smaller machines.  */
+typedef unsigned _Unwind_Word __attribute__((__mode__(__word__)));
+typedef signed _Unwind_Sword __attribute__((__mode__(__word__)));
+#if defined(__ia64__) && defined(__hpux__)
+typedef unsigned _Unwind_Ptr __attribute__((__mode__(__word__)));
+#else
+typedef unsigned _Unwind_Ptr __attribute__((__mode__(__pointer__)));
+#endif
+typedef unsigned _Unwind_Internal_Ptr __attribute__((__mode__(__pointer__)));
+
+/* @@@ The IA-64 ABI uses a 64-bit word to identify the producer and
+   consumer of an exception.  We'll go along with this for now even on
+   32-bit machines.  We'll need to provide some other option for
+   16-bit machines and for machines with > 8 bits per byte.  */
+typedef unsigned _Unwind_Exception_Class __attribute__((__mode__(__DI__)));
+
+/* The unwind interface uses reason codes in several contexts to
+   identify the reasons for failures or other actions.  */
+typedef enum
+{
+  _URC_NO_REASON = 0,
+  _URC_FOREIGN_EXCEPTION_CAUGHT = 1,
+  _URC_FATAL_PHASE2_ERROR = 2,
+  _URC_FATAL_PHASE1_ERROR = 3,
+  _URC_NORMAL_STOP = 4,
+  _URC_END_OF_STACK = 5,
+  _URC_HANDLER_FOUND = 6,
+  _URC_INSTALL_CONTEXT = 7,
+  _URC_CONTINUE_UNWIND = 8
+} _Unwind_Reason_Code;
+
+
+/* The unwind interface uses a pointer to an exception header object
+   as its representation of an exception being thrown. In general, the
+   full representation of an exception object is language- and
+   implementation-specific, but it will be prefixed by a header
+   understood by the unwind interface.  */
+
+struct _Unwind_Exception;
+
+typedef void (*_Unwind_Exception_Cleanup_Fn) (_Unwind_Reason_Code,
+					      struct _Unwind_Exception *);
+
+struct _Unwind_Exception
+{
+  _Unwind_Exception_Class exception_class;
+  _Unwind_Exception_Cleanup_Fn exception_cleanup;
+  _Unwind_Word private_1;
+  _Unwind_Word private_2;
+
+  /* @@@ The IA-64 ABI says that this structure must be double-word aligned.
+     Taking that literally does not make much sense generically.  Instead we
+     provide the maximum alignment required by any type for the machine.  */
+} __attribute__((__aligned__));
+
+
+/* The ACTIONS argument to the personality routine is a bitwise OR of one
+   or more of the following constants.  */
+typedef int _Unwind_Action;
+
+#define _UA_SEARCH_PHASE	1
+#define _UA_CLEANUP_PHASE	2
+#define _UA_HANDLER_FRAME	4
+#define _UA_FORCE_UNWIND	8
+#define _UA_END_OF_STACK	16
+
+/* This is an opaque type used to refer to a system-specific data
+   structure used by the system unwinder. This context is created and
+   destroyed by the system, and passed to the personality routine
+   during unwinding.  */
+struct _Unwind_Context;
+
+/* Raise an exception, passing along the given exception object.  */
+extern _Unwind_Reason_Code _Unwind_RaiseException (struct _Unwind_Exception *);
+
+/* Raise an exception for forced unwinding.  */
+
+typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)
+     (int, _Unwind_Action, _Unwind_Exception_Class,
+      struct _Unwind_Exception *, struct _Unwind_Context *, void *);
+
+extern _Unwind_Reason_Code _Unwind_ForcedUnwind (struct _Unwind_Exception *,
+						 _Unwind_Stop_Fn,
+						 void *);
+
+/* Helper to invoke the exception_cleanup routine.  */
+extern void _Unwind_DeleteException (struct _Unwind_Exception *);
+
+/* Resume propagation of an existing exception.  This is used after
+   e.g. executing cleanup code, and not to implement rethrowing.  */
+extern void _Unwind_Resume (struct _Unwind_Exception *);
+
+/* @@@ Use unwind data to perform a stack backtrace.  The trace callback
+   is called for every stack frame in the call chain, but no cleanup
+   actions are performed.  */
+typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn)
+     (struct _Unwind_Context *, void *);
+
+extern _Unwind_Reason_Code _Unwind_Backtrace (_Unwind_Trace_Fn, void *);
+
+/* These functions are used for communicating information about the unwind
+   context (i.e. the unwind descriptors and the user register state) between
+   the unwind library and the personality routine and landing pad.  Only
+   selected registers maybe manipulated.  */
+
+extern _Unwind_Word _Unwind_GetGR (struct _Unwind_Context *, int);
+extern void _Unwind_SetGR (struct _Unwind_Context *, int, _Unwind_Word);
+
+extern _Unwind_Ptr _Unwind_GetIP (struct _Unwind_Context *);
+extern void _Unwind_SetIP (struct _Unwind_Context *, _Unwind_Ptr);
+
+/* @@@ Retrieve the CFA of the given context.  */
+extern _Unwind_Word _Unwind_GetCFA (struct _Unwind_Context *);
+
+extern void *_Unwind_GetLanguageSpecificData (struct _Unwind_Context *);
+
+extern _Unwind_Ptr _Unwind_GetRegionStart (struct _Unwind_Context *);
+
+
+/* The personality routine is the function in the C++ (or other language)
+   runtime library which serves as an interface between the system unwind
+   library and language-specific exception handling semantics.  It is
+   specific to the code fragment described by an unwind info block, and
+   it is always referenced via the pointer in the unwind info block, and
+   hence it has no ABI-specified name.
+
+   Note that this implies that two different C++ implementations can
+   use different names, and have different contents in the language
+   specific data area.  Moreover, that the language specific data
+   area contains no version info because name of the function invoked
+   provides more effective versioning by detecting at link time the
+   lack of code to handle the different data format.  */
+
+typedef _Unwind_Reason_Code (*_Unwind_Personality_Fn)
+     (int, _Unwind_Action, _Unwind_Exception_Class,
+      struct _Unwind_Exception *, struct _Unwind_Context *);
+
+/* @@@ The following alternate entry points are for setjmp/longjmp
+   based unwinding.  */
+
+struct SjLj_Function_Context;
+extern void _Unwind_SjLj_Register (struct SjLj_Function_Context *);
+extern void _Unwind_SjLj_Unregister (struct SjLj_Function_Context *);
+
+extern _Unwind_Reason_Code _Unwind_SjLj_RaiseException
+     (struct _Unwind_Exception *);
+extern _Unwind_Reason_Code _Unwind_SjLj_ForcedUnwind
+     (struct _Unwind_Exception *, _Unwind_Stop_Fn, void *);
+extern void _Unwind_SjLj_Resume (struct _Unwind_Exception *);
+
+/* @@@ The following provide access to the base addresses for text
+   and data-relative addressing in the LDSA.  In order to stay link
+   compatible with the standard ABI for IA-64, we inline these.  */
+
+#ifdef __ia64__
+#include <stdlib.h>
+
+static inline _Unwind_Ptr
+_Unwind_GetDataRelBase (struct _Unwind_Context *_C)
+{
+  /* The GP is stored in R1.  */
+  return _Unwind_GetGR (_C, 1);
+}
+
+static inline _Unwind_Ptr
+_Unwind_GetTextRelBase (struct _Unwind_Context *_C)
+{
+  abort ();
+  return 0;
+}
+
+/* @@@ Retrieve the Backing Store Pointer of the given context.  */
+extern _Unwind_Word _Unwind_GetBSP (struct _Unwind_Context *);
+#else
+extern _Unwind_Ptr _Unwind_GetDataRelBase (struct _Unwind_Context *);
+extern _Unwind_Ptr _Unwind_GetTextRelBase (struct _Unwind_Context *);
+#endif
+
+/* @@@ Given an address, return the entry point of the function that
+   contains it.  */
+extern void * _Unwind_FindEnclosingFunction (void *pc);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	/* unwind.h */