Merge remote-tracking branch 'origin/master' into prelink

* origin/master: (61 commits)
  fts: fix warning due to old-style function definition
  ldso_tls: fix compiler warning due to missing cast
  resolv: fix bug in res_init with ipv6 nameservers
  config: Fix passing defconfig args
  buildsys: pt-initfini.s depends on uClibc_config.h
  libdl: search for ELF_RTYPE_CLASS_DLSYM in dlsym()
  resolv: try next server on SERVFAIL
  getaddrinfo: allow numeric service without any hints
  bump version to 0.9.33-git
  nptl/pthread: Correct path for machine specific pt-initfini.c
  ctor/dtor nptl: Fix init and fini function compilation
  Rules.mak: Rearrange appending UCLIBC_EXTRA_CFLAGS to CFLAGS
  ARM: remove EABI/OABI selection
  ARM: detect BX availibility at build time
  ARM: #include <bits/arm_asm.h> where __USE_BX__ is used
  ARM: transform the EABI/OABI choice into a boolean
  ARM: remove sub-arch/variants selection from menuconfig
  ARM: introduce blind options to select & force THUMB mode
  ARM: reorder "Use BX" option
  Fix __libc_epoll_pwait compile failure on x86
  ...

Conflicts:
	ldso/libdl/libdl.c

Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>

6 files changed, 297 insertions, 7 deletions

diff --git a/libc/sysdeps/linux/arm/Makefile.arch b/libc/sysdeps/linux/arm/Makefile.arch
index b53c539bf..14279e0d7 100644
--- a/libc/sysdeps/linux/arm/Makefile.arch
+++ b/libc/sysdeps/linux/arm/Makefile.arch
@@ -24,7 +24,12 @@ ifeq ($(UCLIBC_HAS_ADVANCED_REALTIME),y)
 CSRC += posix_fadvise.c posix_fadvise64.c
 endif
 
-ifeq ($(CONFIG_ARM_EABI),y)
+# Is our compiler set up for EABI ?
+IS_EABI:=$(shell $(CC) $(CFLAGS) -x c - -E -dM </dev/null 2>/dev/null \
+                 |sed -r -e '/^\#[[:space:]]*define[[:space:]]+__ARM_EABI__([[:space:]]+1)?$$/!d; s/.+/y/;' \
+          )
+
+ifeq ($(IS_EABI),y)
 CSRC += aeabi_assert.c aeabi_atexit.c aeabi_errno_addr.c \
 	aeabi_localeconv.c aeabi_memclr.c aeabi_memcpy.c \
 	aeabi_memmove.c aeabi_memset.c find_exidx.c
@@ -37,7 +42,7 @@ else
 CSRC += syscall.c
 endif
 
-ifeq ($(CONFIG_ARM_EABI),y)
+ifeq ($(IS_EABI),y)
 libc-static-y += $(ARCH_OUT)/aeabi_lcsts.o $(ARCH_OUT)/aeabi_math.o \
 	$(ARCH_OUT)/aeabi_sighandlers.o
 libc-nonshared-y += $(ARCH_OUT)/aeabi_lcsts.os $(ARCH_OUT)/aeabi_math.os \
diff --git a/libc/sysdeps/linux/arm/bits/arm_asm.h b/libc/sysdeps/linux/arm/bits/arm_asm.h
index 1d87df6eb..921c9a3c9 100644
--- a/libc/sysdeps/linux/arm/bits/arm_asm.h
+++ b/libc/sysdeps/linux/arm/bits/arm_asm.h
@@ -24,5 +24,12 @@
 #define THUMB1_ONLY 1
 #endif
 
-#endif /* _ARM_ASM_H */
+#if defined(__USE_BX__)
+# if (   defined (__ARM_ARCH_2__)  || defined (__ARM_ARCH_3__) \
+      || defined (__ARM_ARCH_3M__) || defined (__ARM_ARCH_4__) \
+     )
+#  error Use of BX was requested, but is not available on the target processor.
+# endif /* ARCH level */
+#endif /* __USE_BX__ */
 
+#endif /* _ARM_ASM_H */
diff --git a/libc/sysdeps/linux/arm/bits/huge_val.h b/libc/sysdeps/linux/arm/bits/huge_val.h
index a215f3c0b..745e0bbd5 100644
--- a/libc/sysdeps/linux/arm/bits/huge_val.h
+++ b/libc/sysdeps/linux/arm/bits/huge_val.h
@@ -32,7 +32,7 @@
 # define HUGE_VAL (__extension__ 0x1.0p2047)
 #elif defined __GNUC__
 
-#ifndef __CONFIG_ARM_EABI__
+#ifndef __ARM_EABI__
 # define HUGE_VAL \
   (__extension__							      \
    ((union { unsigned __l __attribute__((__mode__(__DI__))); double __d; })   \
@@ -50,7 +50,7 @@
 
 typedef union { unsigned char __c[8]; double __d; } __huge_val_t;
 
-#ifndef __CONFIG_ARM_EABI__
+#ifndef __ARM_EABI__
 # if __BYTE_ORDER == __BIG_ENDIAN
 #  define __HUGE_VAL_bytes	{ 0, 0, 0, 0, 0x7f, 0xf0, 0, 0 }
 # endif
diff --git a/libc/sysdeps/linux/arm/crtn.S b/libc/sysdeps/linux/arm/crtn.S
index de01b38dc..a4752c186 100644
--- a/libc/sysdeps/linux/arm/crtn.S
+++ b/libc/sysdeps/linux/arm/crtn.S
@@ -15,7 +15,6 @@
 	.arm
 	ldmdb	fp, {r4, r5, r6, r7, r8, r9, sl, fp, sp, pc}
 #endif
-	.size	_init, .-_init
 	
 	.section .fini
 	.global	_fini
@@ -29,7 +28,6 @@
 	.arm
 	ldmdb	fp, {r4, r5, r6, r7, r8, r9, sl, fp, sp, pc}
 #endif
-	.size	_fini, .-_fini
 	
 	@ In fact this is modified to 3.4.4
 	.ident	"GCC: (GNU) 3.3.2 20031005 (Debian prerelease)"
diff --git a/libc/sysdeps/linux/arm/sysdep.h b/libc/sysdeps/linux/arm/sysdep.h
index 013f88cdd..e498695be 100644
--- a/libc/sysdeps/linux/arm/sysdep.h
+++ b/libc/sysdeps/linux/arm/sysdep.h
@@ -21,6 +21,7 @@
 #define _LINUX_ARM_SYSDEP_H 1
 
 #include <common/sysdep.h>
+#include <bits/arm_asm.h>
 
 #include <sys/syscall.h>
 /* For Linux we can use the system call table in the header file
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 */