google3/third_party/grte/v4_src/glibc-2.19/elf/dl-sysdep.c - GRTEv4 - Git at Google

 /* Operating system support for run-time dynamic linker.  Generic Unix version.
    Copyright (C) 1995-2014 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, see
    <http://www.gnu.org/licenses/>.  */

 /* We conditionalize the whole of this file rather than simply eliding it
    from the static build, because other sysdeps/ versions of this file
    might define things needed by a static build.  */

 #ifdef SHARED

 #include <assert.h>
 #include <elf.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <libintl.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/mman.h>
 #include <ldsodefs.h>
 #include <_itoa.h>
 #include <fpu_control.h>

 #include <entry.h>
 #include <dl-machine.h>
 #include <dl-procinfo.h>
 #include <dl-osinfo.h>
 #include <hp-timing.h>
 #include <tls.h>

 extern char **_environ attribute_hidden;
 extern char _end[] attribute_hidden;

 /* Protect SUID program against misuse of file descriptors.  */
 extern void __libc_check_standard_fds (void);

 #ifdef NEED_DL_BASE_ADDR
 ElfW(Addr) _dl_base_addr;
 #endif
 int __libc_enable_secure attribute_relro = 0;
 INTVARDEF(__libc_enable_secure)
 int __libc_multiple_libcs = 0;	/* Defining this here avoids the inclusion
 				   of init-first.  */
 /* This variable contains the lowest stack address ever used.  */
 void *__libc_stack_end attribute_relro = NULL;
 rtld_hidden_data_def(__libc_stack_end)
 void *_dl_random attribute_relro = NULL;

 #ifndef DL_FIND_ARG_COMPONENTS
 # define DL_FIND_ARG_COMPONENTS(cookie, argc, argv, envp, auxp)	\
   do {									      \
     void **_tmp;							      \
     (argc) = *(long int *) cookie;					      \
     (argv) = (char **) ((long int *) cookie + 1);			      \
     (envp) = (argv) + (argc) + 1;					      \
     for (_tmp = (void **) (envp); *_tmp; ++_tmp)			      \
       continue;								      \
     (auxp) = (void *) ++_tmp;						      \
   } while (0)
 #endif

 #ifndef DL_STACK_END
 # define DL_STACK_END(cookie) ((void *) (cookie))
 #endif

 ElfW(Addr)
 _dl_sysdep_start (void **start_argptr,
 		  void (*dl_main) (const ElfW(Phdr) *phdr, ElfW(Word) phnum,
 				   ElfW(Addr) *user_entry, ElfW(auxv_t) *auxv))
 {
   const ElfW(Phdr) *phdr = NULL;
   ElfW(Word) phnum = 0;
   ElfW(Addr) user_entry;
   ElfW(auxv_t) *av;
 #ifdef HAVE_AUX_SECURE
 # define set_seen(tag) (tag)	/* Evaluate for the side effects.  */
 # define set_seen_secure() ((void) 0)
 #else
   uid_t uid = 0;
   gid_t gid = 0;
   unsigned int seen = 0;
 # define set_seen_secure() (seen = -1)
 # ifdef HAVE_AUX_XID
 #  define set_seen(tag) (tag)	/* Evaluate for the side effects.  */
 # else
 #  define M(type) (1 << (type))
 #  define set_seen(tag) seen |= M ((tag)->a_type)
 # endif
 #endif
 #ifdef NEED_DL_SYSINFO
   uintptr_t new_sysinfo = 0;
 #endif

   __libc_stack_end = DL_STACK_END (start_argptr);
   DL_FIND_ARG_COMPONENTS (start_argptr, _dl_argc, INTUSE(_dl_argv), _environ,
 			  GLRO(dl_auxv));

   user_entry = (ElfW(Addr)) ENTRY_POINT;
   GLRO(dl_platform) = NULL; /* Default to nothing known about the platform.  */

   for (av = GLRO(dl_auxv); av->a_type != AT_NULL; set_seen (av++))
     switch (av->a_type)
       {
       case AT_PHDR:
 	phdr = (void *) av->a_un.a_val;
 	break;
       case AT_PHNUM:
 	phnum = av->a_un.a_val;
 	break;
       case AT_PAGESZ:
 	GLRO(dl_pagesize) = av->a_un.a_val;
 	break;
       case AT_ENTRY:
 	user_entry = av->a_un.a_val;
 	break;
 #ifdef NEED_DL_BASE_ADDR
       case AT_BASE:
 	_dl_base_addr = av->a_un.a_val;
 	break;
 #endif
 #ifndef HAVE_AUX_SECURE
       case AT_UID:
       case AT_EUID:
 	uid ^= av->a_un.a_val;
 	break;
       case AT_GID:
       case AT_EGID:
 	gid ^= av->a_un.a_val;
 	break;
 #endif
       case AT_SECURE:
 #ifndef HAVE_AUX_SECURE
 	seen = -1;
 #endif
 	INTUSE(__libc_enable_secure) = av->a_un.a_val;
 	break;
       case AT_PLATFORM:
 	GLRO(dl_platform) = (void *) av->a_un.a_val;
 	break;
       case AT_HWCAP:
 	GLRO(dl_hwcap) = (unsigned long int) av->a_un.a_val;
 	break;
       case AT_HWCAP2:
 	GLRO(dl_hwcap2) = (unsigned long int) av->a_un.a_val;
 	break;
       case AT_CLKTCK:
 	GLRO(dl_clktck) = av->a_un.a_val;
 	break;
       case AT_FPUCW:
 	GLRO(dl_fpu_control) = av->a_un.a_val;
 	break;
 #ifdef NEED_DL_SYSINFO
       case AT_SYSINFO:
 	new_sysinfo = av->a_un.a_val;
 	break;
 #endif
 #ifdef NEED_DL_SYSINFO_DSO
       case AT_SYSINFO_EHDR:
 	GLRO(dl_sysinfo_dso) = (void *) av->a_un.a_val;
 	break;
 #endif
       case AT_RANDOM:
 	_dl_random = (void *) av->a_un.a_val;
 	break;
 #ifdef DL_PLATFORM_AUXV
       DL_PLATFORM_AUXV
 #endif
       }

 #ifndef HAVE_AUX_SECURE
   if (seen != -1)
     {
       /* Fill in the values we have not gotten from the kernel through the
 	 auxiliary vector.  */
 # ifndef HAVE_AUX_XID
 #  define SEE(UID, var, uid) \
    if ((seen & M (AT_##UID)) == 0) var ^= __get##uid ()
       SEE (UID, uid, uid);
       SEE (EUID, uid, euid);
       SEE (GID, gid, gid);
       SEE (EGID, gid, egid);
 # endif

       /* If one of the two pairs of IDs does not match this is a setuid
 	 or setgid run.  */
       INTUSE(__libc_enable_secure) = uid | gid;
     }
 #endif

 #ifndef HAVE_AUX_PAGESIZE
   if (GLRO(dl_pagesize) == 0)
     GLRO(dl_pagesize) = __getpagesize ();
 #endif

 #ifdef NEED_DL_SYSINFO
   if (new_sysinfo != 0)
     {
 # ifdef NEED_DL_SYSINFO_DSO
       /* Only set the sysinfo value if we also have the vsyscall DSO.  */
       if (GLRO(dl_sysinfo_dso) != 0)
 # endif
         GLRO(dl_sysinfo) = new_sysinfo;
     }
 #endif

 #ifdef DL_SYSDEP_INIT
   DL_SYSDEP_INIT;
 #endif

 #ifdef DL_PLATFORM_INIT
   DL_PLATFORM_INIT;
 #endif

   /* Determine the length of the platform name.  */
   if (GLRO(dl_platform) != NULL)
     GLRO(dl_platformlen) = strlen (GLRO(dl_platform));

   if (__sbrk (0) == _end)
     /* The dynamic linker was run as a program, and so the initial break
        starts just after our bss, at &_end.  The malloc in dl-minimal.c
        will consume the rest of this page, so tell the kernel to move the
        break up that far.  When the user program examines its break, it
        will see this new value and not clobber our data.  */
     __sbrk (GLRO(dl_pagesize)
 	    - ((_end - (char *) 0) & (GLRO(dl_pagesize) - 1)));

   /* If this is a SUID program we make sure that FDs 0, 1, and 2 are
      allocated.  If necessary we are doing it ourself.  If it is not
      possible we stop the program.  */
   if (__builtin_expect (INTUSE(__libc_enable_secure), 0))
     __libc_check_standard_fds ();

   (*dl_main) (phdr, phnum, &user_entry, GLRO(dl_auxv));
   return user_entry;
 }

 void
 internal_function
 _dl_sysdep_start_cleanup (void)
 {
 }

 void
 internal_function
 _dl_show_auxv (void)
 {
   char buf[64];
   ElfW(auxv_t) *av;

   /* Terminate string.  */
   buf[63] = '\0';

   /* The following code assumes that the AT_* values are encoded
      starting from 0 with AT_NULL, 1 for AT_IGNORE, and all other values
      close by (otherwise the array will be too large).  In case we have
      to support a platform where these requirements are not fulfilled
      some alternative implementation has to be used.  */
   for (av = GLRO(dl_auxv); av->a_type != AT_NULL; ++av)
     {
       static const struct
       {
 	const char label[17];
 	enum { unknown = 0, dec, hex, str, ignore } form : 8;
       } auxvars[] =
 	{
 	  [AT_EXECFD - 2] =		{ "EXECFD:       ", dec },
 	  [AT_EXECFN - 2] =		{ "EXECFN:       ", str },
 	  [AT_PHDR - 2] =		{ "PHDR:         0x", hex },
 	  [AT_PHENT - 2] =		{ "PHENT:        ", dec },
 	  [AT_PHNUM - 2] =		{ "PHNUM:        ", dec },
 	  [AT_PAGESZ - 2] =		{ "PAGESZ:       ", dec },
 	  [AT_BASE - 2] =		{ "BASE:         0x", hex },
 	  [AT_FLAGS - 2] =		{ "FLAGS:        0x", hex },
 	  [AT_ENTRY - 2] =		{ "ENTRY:        0x", hex },
 	  [AT_NOTELF - 2] =		{ "NOTELF:       ", hex },
 	  [AT_UID - 2] =		{ "UID:          ", dec },
 	  [AT_EUID - 2] =		{ "EUID:         ", dec },
 	  [AT_GID - 2] =		{ "GID:          ", dec },
 	  [AT_EGID - 2] =		{ "EGID:         ", dec },
 	  [AT_PLATFORM - 2] =		{ "PLATFORM:     ", str },
 	  [AT_HWCAP - 2] =		{ "HWCAP:        ", hex },
 	  [AT_CLKTCK - 2] =		{ "CLKTCK:       ", dec },
 	  [AT_FPUCW - 2] =		{ "FPUCW:        ", hex },
 	  [AT_DCACHEBSIZE - 2] =	{ "DCACHEBSIZE:  0x", hex },
 	  [AT_ICACHEBSIZE - 2] =	{ "ICACHEBSIZE:  0x", hex },
 	  [AT_UCACHEBSIZE - 2] =	{ "UCACHEBSIZE:  0x", hex },
 	  [AT_IGNOREPPC - 2] =		{ "IGNOREPPC", ignore },
 	  [AT_SECURE - 2] =		{ "SECURE:       ", dec },
 	  [AT_BASE_PLATFORM - 2] =	{ "BASE_PLATFORM:", str },
 	  [AT_SYSINFO - 2] =		{ "SYSINFO:      0x", hex },
 	  [AT_SYSINFO_EHDR - 2] =	{ "SYSINFO_EHDR: 0x", hex },
 	  [AT_RANDOM - 2] =		{ "RANDOM:       0x", hex },
 	  [AT_HWCAP2 - 2] =		{ "HWCAP2:       0x", hex },
 	};
       unsigned int idx = (unsigned int) (av->a_type - 2);

       if ((unsigned int) av->a_type < 2u
 	  || (idx < sizeof (auxvars) / sizeof (auxvars[0])
 	      && auxvars[idx].form == ignore))
 	continue;

       assert (AT_NULL == 0);
       assert (AT_IGNORE == 1);

       if (av->a_type == AT_HWCAP || av->a_type == AT_HWCAP2)
 	{
 	  /* These are handled in a special way per platform.  */
 	  if (_dl_procinfo (av->a_type, av->a_un.a_val) == 0)
 	    continue;
 	}

       if (idx < sizeof (auxvars) / sizeof (auxvars[0])
 	  && auxvars[idx].form != unknown)
 	{
 	  const char *val = (char *) av->a_un.a_val;

 	  if (__builtin_expect (auxvars[idx].form, dec) == dec)
 	    val = _itoa ((unsigned long int) av->a_un.a_val,
 			 buf + sizeof buf - 1, 10, 0);
 	  else if (__builtin_expect (auxvars[idx].form, hex) == hex)
 	    val = _itoa ((unsigned long int) av->a_un.a_val,
 			 buf + sizeof buf - 1, 16, 0);

 	  _dl_printf ("AT_%s%s\n", auxvars[idx].label, val);

 	  continue;
 	}

       /* Unknown value: print a generic line.  */
       char buf2[17];
       buf2[sizeof (buf2) - 1] = '\0';
       const char *val2 = _itoa ((unsigned long int) av->a_un.a_val,
 				buf2 + sizeof buf2 - 1, 16, 0);
       const char *val =  _itoa ((unsigned long int) av->a_type,
 				buf + sizeof buf - 1, 16, 0);
       _dl_printf ("AT_??? (0x%s): 0x%s\n", val, val2);
     }
 }

 #endif
	/* Operating system support for run-time dynamic linker. Generic Unix version.
	Copyright (C) 1995-2014 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, see
	<http://www.gnu.org/licenses/>. */

	/* We conditionalize the whole of this file rather than simply eliding it
	from the static build, because other sysdeps/ versions of this file
	might define things needed by a static build. */

	#ifdef SHARED

	#include <assert.h>
	#include <elf.h>
	#include <errno.h>
	#include <fcntl.h>
	#include <libintl.h>
	#include <stdlib.h>
	#include <string.h>
	#include <unistd.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <sys/mman.h>
	#include <ldsodefs.h>
	#include <_itoa.h>
	#include <fpu_control.h>

	#include <entry.h>
	#include <dl-machine.h>
	#include <dl-procinfo.h>
	#include <dl-osinfo.h>
	#include <hp-timing.h>
	#include <tls.h>

	extern char **_environ attribute_hidden;
	extern char _end[] attribute_hidden;

	/* Protect SUID program against misuse of file descriptors. */
	extern void __libc_check_standard_fds (void);

	#ifdef NEED_DL_BASE_ADDR
	ElfW(Addr) _dl_base_addr;
	#endif
	int __libc_enable_secure attribute_relro = 0;
	INTVARDEF(__libc_enable_secure)
	int __libc_multiple_libcs = 0; /* Defining this here avoids the inclusion
	of init-first. */
	/* This variable contains the lowest stack address ever used. */
	void *__libc_stack_end attribute_relro = NULL;
	rtld_hidden_data_def(__libc_stack_end)
	void *_dl_random attribute_relro = NULL;

	#ifndef DL_FIND_ARG_COMPONENTS
	# define DL_FIND_ARG_COMPONENTS(cookie, argc, argv, envp, auxp) \
	do { \
	void **_tmp; \
	(argc) = (long int ) cookie; \
	(argv) = (char *) ((long int ) cookie + 1); \
	(envp) = (argv) + (argc) + 1; \
	for (_tmp = (void *) (envp); _tmp; ++_tmp) \
	continue; \
	(auxp) = (void *) ++_tmp; \
	} while (0)
	#endif

	#ifndef DL_STACK_END
	# define DL_STACK_END(cookie) ((void *) (cookie))
	#endif

	ElfW(Addr)
	_dl_sysdep_start (void **start_argptr,
	void (dl_main) (const ElfW(Phdr) phdr, ElfW(Word) phnum,
	ElfW(Addr) user_entry, ElfW(auxv_t) auxv))
	{
	const ElfW(Phdr) *phdr = NULL;
	ElfW(Word) phnum = 0;
	ElfW(Addr) user_entry;
	ElfW(auxv_t) *av;
	#ifdef HAVE_AUX_SECURE
	# define set_seen(tag) (tag) /* Evaluate for the side effects. */
	# define set_seen_secure() ((void) 0)
	#else
	uid_t uid = 0;
	gid_t gid = 0;
	unsigned int seen = 0;
	# define set_seen_secure() (seen = -1)
	# ifdef HAVE_AUX_XID
	# define set_seen(tag) (tag) /* Evaluate for the side effects. */
	# else
	# define M(type) (1 << (type))
	# define set_seen(tag) seen \|= M ((tag)->a_type)
	# endif
	#endif
	#ifdef NEED_DL_SYSINFO
	uintptr_t new_sysinfo = 0;
	#endif

	__libc_stack_end = DL_STACK_END (start_argptr);
	DL_FIND_ARG_COMPONENTS (start_argptr, _dl_argc, INTUSE(_dl_argv), _environ,
	GLRO(dl_auxv));

	user_entry = (ElfW(Addr)) ENTRY_POINT;
	GLRO(dl_platform) = NULL; /* Default to nothing known about the platform. */

	for (av = GLRO(dl_auxv); av->a_type != AT_NULL; set_seen (av++))
	switch (av->a_type)
	{
	case AT_PHDR:
	phdr = (void *) av->a_un.a_val;
	break;
	case AT_PHNUM:
	phnum = av->a_un.a_val;
	break;
	case AT_PAGESZ:
	GLRO(dl_pagesize) = av->a_un.a_val;
	break;
	case AT_ENTRY:
	user_entry = av->a_un.a_val;
	break;
	#ifdef NEED_DL_BASE_ADDR
	case AT_BASE:
	_dl_base_addr = av->a_un.a_val;
	break;
	#endif
	#ifndef HAVE_AUX_SECURE
	case AT_UID:
	case AT_EUID:
	uid ^= av->a_un.a_val;
	break;
	case AT_GID:
	case AT_EGID:
	gid ^= av->a_un.a_val;
	break;
	#endif
	case AT_SECURE:
	#ifndef HAVE_AUX_SECURE
	seen = -1;
	#endif
	INTUSE(__libc_enable_secure) = av->a_un.a_val;
	break;
	case AT_PLATFORM:
	GLRO(dl_platform) = (void *) av->a_un.a_val;
	break;
	case AT_HWCAP:
	GLRO(dl_hwcap) = (unsigned long int) av->a_un.a_val;
	break;
	case AT_HWCAP2:
	GLRO(dl_hwcap2) = (unsigned long int) av->a_un.a_val;
	break;
	case AT_CLKTCK:
	GLRO(dl_clktck) = av->a_un.a_val;
	break;
	case AT_FPUCW:
	GLRO(dl_fpu_control) = av->a_un.a_val;
	break;
	#ifdef NEED_DL_SYSINFO
	case AT_SYSINFO:
	new_sysinfo = av->a_un.a_val;
	break;
	#endif
	#ifdef NEED_DL_SYSINFO_DSO
	case AT_SYSINFO_EHDR:
	GLRO(dl_sysinfo_dso) = (void *) av->a_un.a_val;
	break;
	#endif
	case AT_RANDOM:
	_dl_random = (void *) av->a_un.a_val;
	break;
	#ifdef DL_PLATFORM_AUXV
	DL_PLATFORM_AUXV
	#endif
	}

	#ifndef HAVE_AUX_SECURE
	if (seen != -1)
	{
	/* Fill in the values we have not gotten from the kernel through the
	auxiliary vector. */
	# ifndef HAVE_AUX_XID
	# define SEE(UID, var, uid) \
	if ((seen & M (AT_##UID)) == 0) var ^= __get##uid ()
	SEE (UID, uid, uid);
	SEE (EUID, uid, euid);
	SEE (GID, gid, gid);
	SEE (EGID, gid, egid);
	# endif

	/* If one of the two pairs of IDs does not match this is a setuid
	or setgid run. */
	INTUSE(__libc_enable_secure) = uid \| gid;
	}
	#endif

	#ifndef HAVE_AUX_PAGESIZE
	if (GLRO(dl_pagesize) == 0)
	GLRO(dl_pagesize) = __getpagesize ();
	#endif

	#ifdef NEED_DL_SYSINFO
	if (new_sysinfo != 0)
	{
	# ifdef NEED_DL_SYSINFO_DSO
	/* Only set the sysinfo value if we also have the vsyscall DSO. */
	if (GLRO(dl_sysinfo_dso) != 0)
	# endif
	GLRO(dl_sysinfo) = new_sysinfo;
	}
	#endif

	#ifdef DL_SYSDEP_INIT
	DL_SYSDEP_INIT;
	#endif

	#ifdef DL_PLATFORM_INIT
	DL_PLATFORM_INIT;
	#endif

	/* Determine the length of the platform name. */
	if (GLRO(dl_platform) != NULL)
	GLRO(dl_platformlen) = strlen (GLRO(dl_platform));

	if (__sbrk (0) == _end)
	/* The dynamic linker was run as a program, and so the initial break
	starts just after our bss, at &_end. The malloc in dl-minimal.c
	will consume the rest of this page, so tell the kernel to move the
	break up that far. When the user program examines its break, it
	will see this new value and not clobber our data. */
	__sbrk (GLRO(dl_pagesize)
	- ((_end - (char *) 0) & (GLRO(dl_pagesize) - 1)));

	/* If this is a SUID program we make sure that FDs 0, 1, and 2 are
	allocated. If necessary we are doing it ourself. If it is not
	possible we stop the program. */
	if (__builtin_expect (INTUSE(__libc_enable_secure), 0))
	__libc_check_standard_fds ();

	(*dl_main) (phdr, phnum, &user_entry, GLRO(dl_auxv));
	return user_entry;
	}

	void
	internal_function
	_dl_sysdep_start_cleanup (void)
	{
	}

	void
	internal_function
	_dl_show_auxv (void)
	{
	char buf[64];
	ElfW(auxv_t) *av;

	/* Terminate string. */
	buf[63] = '\0';

	/* The following code assumes that the AT_* values are encoded
	starting from 0 with AT_NULL, 1 for AT_IGNORE, and all other values
	close by (otherwise the array will be too large). In case we have
	to support a platform where these requirements are not fulfilled
	some alternative implementation has to be used. */
	for (av = GLRO(dl_auxv); av->a_type != AT_NULL; ++av)
	{
	static const struct
	{
	const char label[17];
	enum { unknown = 0, dec, hex, str, ignore } form : 8;
	} auxvars[] =
	{
	[AT_EXECFD - 2] = { "EXECFD: ", dec },
	[AT_EXECFN - 2] = { "EXECFN: ", str },
	[AT_PHDR - 2] = { "PHDR: 0x", hex },
	[AT_PHENT - 2] = { "PHENT: ", dec },
	[AT_PHNUM - 2] = { "PHNUM: ", dec },
	[AT_PAGESZ - 2] = { "PAGESZ: ", dec },
	[AT_BASE - 2] = { "BASE: 0x", hex },
	[AT_FLAGS - 2] = { "FLAGS: 0x", hex },
	[AT_ENTRY - 2] = { "ENTRY: 0x", hex },
	[AT_NOTELF - 2] = { "NOTELF: ", hex },
	[AT_UID - 2] = { "UID: ", dec },
	[AT_EUID - 2] = { "EUID: ", dec },
	[AT_GID - 2] = { "GID: ", dec },
	[AT_EGID - 2] = { "EGID: ", dec },
	[AT_PLATFORM - 2] = { "PLATFORM: ", str },
	[AT_HWCAP - 2] = { "HWCAP: ", hex },
	[AT_CLKTCK - 2] = { "CLKTCK: ", dec },
	[AT_FPUCW - 2] = { "FPUCW: ", hex },
	[AT_DCACHEBSIZE - 2] = { "DCACHEBSIZE: 0x", hex },
	[AT_ICACHEBSIZE - 2] = { "ICACHEBSIZE: 0x", hex },
	[AT_UCACHEBSIZE - 2] = { "UCACHEBSIZE: 0x", hex },
	[AT_IGNOREPPC - 2] = { "IGNOREPPC", ignore },
	[AT_SECURE - 2] = { "SECURE: ", dec },
	[AT_BASE_PLATFORM - 2] = { "BASE_PLATFORM:", str },
	[AT_SYSINFO - 2] = { "SYSINFO: 0x", hex },
	[AT_SYSINFO_EHDR - 2] = { "SYSINFO_EHDR: 0x", hex },
	[AT_RANDOM - 2] = { "RANDOM: 0x", hex },
	[AT_HWCAP2 - 2] = { "HWCAP2: 0x", hex },
	};
	unsigned int idx = (unsigned int) (av->a_type - 2);

	if ((unsigned int) av->a_type < 2u
	\|\| (idx < sizeof (auxvars) / sizeof (auxvars[0])
	&& auxvars[idx].form == ignore))
	continue;

	assert (AT_NULL == 0);
	assert (AT_IGNORE == 1);

	if (av->a_type == AT_HWCAP \|\| av->a_type == AT_HWCAP2)
	{
	/* These are handled in a special way per platform. */
	if (_dl_procinfo (av->a_type, av->a_un.a_val) == 0)
	continue;
	}

	if (idx < sizeof (auxvars) / sizeof (auxvars[0])
	&& auxvars[idx].form != unknown)
	{
	const char val = (char ) av->a_un.a_val;

	if (__builtin_expect (auxvars[idx].form, dec) == dec)
	val = _itoa ((unsigned long int) av->a_un.a_val,
	buf + sizeof buf - 1, 10, 0);
	else if (__builtin_expect (auxvars[idx].form, hex) == hex)
	val = _itoa ((unsigned long int) av->a_un.a_val,
	buf + sizeof buf - 1, 16, 0);

	_dl_printf ("AT_%s%s\n", auxvars[idx].label, val);

	continue;
	}

	/* Unknown value: print a generic line. */
	char buf2[17];
	buf2[sizeof (buf2) - 1] = '\0';
	const char *val2 = _itoa ((unsigned long int) av->a_un.a_val,
	buf2 + sizeof buf2 - 1, 16, 0);
	const char *val = _itoa ((unsigned long int) av->a_type,
	buf + sizeof buf - 1, 16, 0);
	_dl_printf ("AT_??? (0x%s): 0x%s\n", val, val2);
	}
	}

	#endif