[thirdparty/glibc.git] / sysdeps / s390 / s390-32 / dl-machine.h

/* Machine-dependent ELF dynamic relocation inline functions.  S390 Version.
   Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006
   Free Software Foundation, Inc.
   Contributed by Carl Pederson & Martin Schwidefsky.
   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.  */

#ifndef dl_machine_h
#define dl_machine_h

#define ELF_MACHINE_NAME "s390"

#include <sys/param.h>
#include <string.h>
#include <link.h>

/* This is an older, now obsolete value.  */
#define EM_S390_OLD	0xA390

/* Return nonzero iff ELF header is compatible with the running host.  */
static inline int
elf_machine_matches_host (const Elf32_Ehdr *ehdr)
{
  return (ehdr->e_machine == EM_S390 || ehdr->e_machine == EM_S390_OLD)
         && ehdr->e_ident[EI_CLASS] == ELFCLASS32;
}


/* Return the link-time address of _DYNAMIC.  Conveniently, this is the
   first element of the GOT.  This must be inlined in a function which
   uses global data.  */

static inline Elf32_Addr
elf_machine_dynamic (void)
{
  register Elf32_Addr *got;

  asm( "        bras   %0,2f\n"
       "1:      .long  _GLOBAL_OFFSET_TABLE_-1b\n"
       "2:      al     %0,0(%0)"
       : "=&a" (got) : : "0" );

  return *got;
}


/* Return the run-time load address of the shared object.  */
static inline Elf32_Addr
elf_machine_load_address (void)
{
  Elf32_Addr addr;

  asm( "   bras  1,2f\n"
       "1: .long _GLOBAL_OFFSET_TABLE_ - 1b\n"
       "   .long _dl_start - 1b - 0x80000000\n"
       "2: l     %0,4(1)\n"
       "   ar    %0,1\n"
       "   al    1,0(1)\n"
       "   sl    %0,_dl_start@GOT12(1)"
       : "=&d" (addr) : : "1" );
  return addr;
}

/* Set up the loaded object described by L so its unrelocated PLT
   entries will jump to the on-demand fixup code in dl-runtime.c.  */

static inline int __attribute__ ((unused))
elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
{
  extern void _dl_runtime_resolve (Elf32_Word);
  extern void _dl_runtime_profile (Elf32_Word);

  if (l->l_info[DT_JMPREL] && lazy)
    {
      /* The GOT entries for functions in the PLT have not yet been filled
	 in.  Their initial contents will arrange when called to push an
	 offset into the .rel.plt section, push _GLOBAL_OFFSET_TABLE_[1],
	 and then jump to _GLOBAL_OFFSET_TABLE[2].  */
      Elf32_Addr *got;
      got = (Elf32_Addr *) D_PTR (l, l_info[DT_PLTGOT]);
      /* If a library is prelinked but we have to relocate anyway,
	 we have to be able to undo the prelinking of .got.plt.
	 The prelinker saved us here address of .plt + 0x2c.  */
      if (got[1])
	{
	  l->l_mach.plt = got[1] + l->l_addr;
	  l->l_mach.gotplt = (Elf32_Addr) &got[3];
	}
      got[1] = (Elf32_Addr) l;	/* Identify this shared object.  */

      /* The got[2] entry contains the address of a function which gets
	 called to get the address of a so far unresolved function and
	 jump to it.  The profiling extension of the dynamic linker allows
	 to intercept the calls to collect information.  In this case we
	 don't store the address in the GOT so that all future calls also
	 end in this function.  */
      if (__builtin_expect (profile, 0))
	{
	  got[2] = (Elf32_Addr) &_dl_runtime_profile;

	  if (GLRO(dl_profile) != NULL
	      && _dl_name_match_p (GLRO(dl_profile), l))
	    /* This is the object we are looking for.  Say that we really
	       want profiling and the timers are started.  */
	    GL(dl_profile_map) = l;
	}
      else
	/* This function will get called to fix up the GOT entry indicated by
	   the offset on the stack, and then jump to the resolved address.  */
	got[2] = (Elf32_Addr) &_dl_runtime_resolve;
    }

  return lazy;
}

/* Mask identifying addresses reserved for the user program,
   where the dynamic linker should not map anything.  */
#define ELF_MACHINE_USER_ADDRESS_MASK   0xf8000000UL

/* Initial entry point code for the dynamic linker.
   The C function `_dl_start' is the real entry point;
   its return value is the user program's entry point.  */

#define RTLD_START asm ("\n\
.text\n\
.align 4\n\
.globl _start\n\
.globl _dl_start_user\n\
_start:\n\
	basr  %r13,0\n\
.L0:    ahi   %r13,.Llit-.L0\n\
	lr    %r2,%r15\n\
	# Alloc stack frame\n\
	ahi   %r15,-96\n\
	# Set the back chain to zero\n\
	xc    0(4,%r15),0(%r15)\n\
	# Call _dl_start with %r2 pointing to arg on stack\n\
	l     %r14,.Ladr1-.Llit(%r13)\n\
	bas   %r14,0(%r14,%r13)   # call _dl_start\n\
_dl_start_user:\n\
	# Save the user entry point address in %r8.\n\
	lr    %r8,%r2\n\
	# Point %r12 at the GOT.\n\
	l     %r12,.Ladr0-.Llit(%r13)\n\
	ar    %r12,%r13\n\
	# See if we were run as a command with the executable file\n\
	# name as an extra leading argument.\n\
	l     %r1,_dl_skip_args@GOT12(0,%r12)\n\
	l     %r1,0(%r1)          # load _dl_skip_args\n\
	# Get the original argument count.\n\
	l     %r0,96(%r15)\n\
	# Subtract _dl_skip_args from it.\n\
	sr    %r0,%r1\n\
	# Adjust the stack pointer to skip _dl_skip_args words.\n\
	sll   %r1,2\n\
	ar    %r15,%r1\n\
	# Set the back chain to zero again\n\
	xc    0(4,%r15),0(%r15)\n\
	# Store back the modified argument count.\n\
	st    %r0,96(%r15)\n\
	# The special initializer gets called with the stack just\n\
	# as the application's entry point will see it; it can\n\
	# switch stacks if it moves these contents over.\n\
" RTLD_START_SPECIAL_INIT "\n\
	# Call the function to run the initializers.\n\
	# Load the parameters:\n\
	# (%r2, %r3, %r4, %r5) = (_dl_loaded, argc, argv, envp)\n\
	l     %r2,_rtld_local@GOT(%r12)\n\
	l     %r2,0(%r2)\n\
	l     %r3,96(%r15)\n\
	la    %r4,100(%r15)\n\
	lr    %r5,%r3\n\
	sll   %r5,2\n\
	la    %r5,104(%r5,%r15)\n\
	l     %r1,.Ladr4-.Llit(%r13)\n\
	bas   %r14,0(%r1,%r13)\n\
	# Pass our finalizer function to the user in %r14, as per ELF ABI.\n\
	l     %r14,_dl_fini@GOT(%r12)\n\
	# Free stack frame\n\
	ahi   %r15,96\n\
	# Jump to the user's entry point (saved in %r8).\n\
	br    %r8\n\
.Llit:\n\
.Ladr0: .long _GLOBAL_OFFSET_TABLE_-.Llit\n\
.Ladr1: .long _dl_start-.Llit\n\
.Ladr4: .long _dl_init_internal@PLT-.Llit\n\
");

#ifndef RTLD_START_SPECIAL_INIT
#define RTLD_START_SPECIAL_INIT /* nothing */
#endif

/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or
   TLS variable, so undefined references should not be allowed to
   define the value.
   ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one
   of the main executable's symbols, as for a COPY reloc.  */
#define elf_machine_type_class(type) \
  ((((type) == R_390_JMP_SLOT || (type) == R_390_TLS_DTPMOD		      \
     || (type) == R_390_TLS_DTPOFF || (type) == R_390_TLS_TPOFF)	      \
    * ELF_RTYPE_CLASS_PLT)						      \
   | (((type) == R_390_COPY) * ELF_RTYPE_CLASS_COPY))

/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries.  */
#define ELF_MACHINE_JMP_SLOT    R_390_JMP_SLOT

/* The S390 never uses Elf32_Rel relocations.  */
#define ELF_MACHINE_NO_REL 1

/* The S390 overlaps DT_RELA and DT_PLTREL.  */
#define ELF_MACHINE_PLTREL_OVERLAP 1

/* We define an initialization functions.  This is called very early in
   _dl_sysdep_start.  */
#define DL_PLATFORM_INIT dl_platform_init ()

static inline void __attribute__ ((unused))
dl_platform_init (void)
{
  if (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0')
    /* Avoid an empty string which would disturb us.  */
    GLRO(dl_platform) = NULL;
}

static inline Elf32_Addr
elf_machine_fixup_plt (struct link_map *map, lookup_t t,
		       const Elf32_Rela *reloc,
		       Elf32_Addr *reloc_addr, Elf32_Addr value)
{
  return *reloc_addr = value;
}

/* Return the final value of a plt relocation.  */
static inline Elf32_Addr
elf_machine_plt_value (struct link_map *map, const Elf32_Rela *reloc,
		       Elf32_Addr value)
{
  return value;
}

/* Names of the architecture-specific auditing callback functions.  */
#define ARCH_LA_PLTENTER s390_32_gnu_pltenter
#define ARCH_LA_PLTEXIT s390_32_gnu_pltexit

#endif /* !dl_machine_h */


#ifdef RESOLVE_MAP

/* Perform the relocation specified by RELOC and SYM (which is fully resolved).
   MAP is the object containing the reloc.  */

auto inline void
__attribute__ ((always_inline))
elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,
		  const Elf32_Sym *sym, const struct r_found_version *version,
		  void *const reloc_addr_arg)
{
  Elf32_Addr *const reloc_addr = reloc_addr_arg;
  const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);

#if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC
  if (__builtin_expect (r_type == R_390_RELATIVE, 0))
    {
# if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC
      /* This is defined in rtld.c, but nowhere in the static libc.a;
	 make the reference weak so static programs can still link.
	 This declaration cannot be done when compiling rtld.c
	 (i.e. #ifdef RTLD_BOOTSTRAP) because rtld.c contains the
	 common defn for _dl_rtld_map, which is incompatible with a
	 weak decl in the same file.  */
#  ifndef SHARED
      weak_extern (GL(dl_rtld_map));
#  endif
      if (map != &GL(dl_rtld_map)) /* Already done in rtld itself.  */
# endif
	*reloc_addr = map->l_addr + reloc->r_addend;
    }
  else
#endif
  if (__builtin_expect (r_type == R_390_NONE, 0))
    return;
  else
    {
#ifndef RESOLVE_CONFLICT_FIND_MAP
      const Elf32_Sym *const refsym = sym;
#endif
      struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type);
      Elf32_Addr value = sym == NULL ? 0 : sym_map->l_addr + sym->st_value;

      switch (r_type)
	{
	case R_390_GLOB_DAT:
	case R_390_JMP_SLOT:
	  *reloc_addr = value + reloc->r_addend;
	  break;

#if (!defined RTLD_BOOTSTRAP || USE___THREAD) \
    && !defined RESOLVE_CONFLICT_FIND_MAP
	case R_390_TLS_DTPMOD:
# ifdef RTLD_BOOTSTRAP
	  /* During startup the dynamic linker is always the module
	     with index 1.
	     XXX If this relocation is necessary move before RESOLVE
	     call.  */
	  *reloc_addr = 1;
# else
	  /* Get the information from the link map returned by the
	     resolv function.  */
	  if (sym_map != NULL)
	    *reloc_addr = sym_map->l_tls_modid;
# endif
	  break;
	case R_390_TLS_DTPOFF:
# ifndef RTLD_BOOTSTRAP
	  /* During relocation all TLS symbols are defined and used.
	     Therefore the offset is already correct.  */
	  if (sym != NULL)
	    *reloc_addr = sym->st_value + reloc->r_addend;
# endif
	  break;
	case R_390_TLS_TPOFF:
	  /* The offset is negative, forward from the thread pointer.  */
# ifdef RTLD_BOOTSTRAP
	  *reloc_addr = sym->st_value + reloc->r_addend - map->l_tls_offset;
# else
	  /* We know the offset of the object the symbol is contained in.
	     It is a negative value which will be added to the
	     thread pointer.  */
	  if (sym != NULL)
	    {
	      CHECK_STATIC_TLS (map, sym_map);
	      *reloc_addr = (sym->st_value + reloc->r_addend
			     - sym_map->l_tls_offset);
	    }
#endif
	  break;
#endif  /* use TLS */

#ifndef RTLD_BOOTSTRAP
# ifndef RESOLVE_CONFLICT_FIND_MAP
	/* Not needed in dl-conflict.c.  */
	case R_390_COPY:
	  if (sym == NULL)
	    /* This can happen in trace mode if an object could not be
	       found.  */
	    break;
	  if (__builtin_expect (sym->st_size > refsym->st_size, 0)
	      || (__builtin_expect (sym->st_size < refsym->st_size, 0)
		  && __builtin_expect (GLRO(dl_verbose), 0)))
	    {
	      const char *strtab;

	      strtab = (const char *) D_PTR(map,l_info[DT_STRTAB]);
	      _dl_error_printf ("\
%s: Symbol `%s' has different size in shared object, consider re-linking\n",
				rtld_progname ?: "<program name unknown>",
				strtab + refsym->st_name);
	    }
	  memcpy (reloc_addr_arg, (void *) value,
		  MIN (sym->st_size, refsym->st_size));
	  break;
# endif
	case R_390_32:
	  *reloc_addr = value + reloc->r_addend;
	  break;
	case R_390_16:
	  *(unsigned short *) reloc_addr = value + reloc->r_addend;
	  break;
	case R_390_8:
	  *(char *) reloc_addr = value + reloc->r_addend;
	  break;
# ifndef RESOLVE_CONFLICT_FIND_MAP
	case R_390_PC32:
	  *reloc_addr = value + reloc->r_addend - (Elf32_Addr) reloc_addr;
	  break;
	case R_390_PC16DBL:
	case R_390_PLT16DBL:
	  *(unsigned short *) reloc_addr = (unsigned short)
	    ((short) (value + reloc->r_addend - (Elf32_Addr) reloc_addr) >> 1);
	  break;
	case R_390_PC16:
	  *(unsigned short *) reloc_addr =
	    value + reloc->r_addend - (Elf32_Addr) reloc_addr;
	  break;
	case R_390_NONE:
	  break;
# endif
#endif
#if !defined(RTLD_BOOTSTRAP) || defined(_NDEBUG)
	default:
	  /* We add these checks in the version to relocate ld.so only
	     if we are still debugging.	 */
	  _dl_reloc_bad_type (map, r_type, 0);
	  break;
#endif
	}
    }
}

auto inline void
__attribute__ ((always_inline))
elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc,
			   void *const reloc_addr_arg)
{
  Elf32_Addr *const reloc_addr = reloc_addr_arg;
  *reloc_addr = l_addr + reloc->r_addend;
}

auto inline void
__attribute__ ((always_inline))
elf_machine_lazy_rel (struct link_map *map,
		      Elf32_Addr l_addr, const Elf32_Rela *reloc)
{
  Elf32_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset);
  const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
  /* Check for unexpected PLT reloc type.  */
  if (__builtin_expect (r_type == R_390_JMP_SLOT, 1))
    {
      if (__builtin_expect (map->l_mach.plt, 0) == 0)
	*reloc_addr += l_addr;
      else
	*reloc_addr =
	  map->l_mach.plt
	  + (((Elf32_Addr) reloc_addr) - map->l_mach.gotplt) * 8;
    }
  else
    _dl_reloc_bad_type (map, r_type, 1);
}

#endif /* RESOLVE_MAP */
Commit	Line	Data
847b055c	1	/* Machine-dependent ELF dynamic relocation inline functions. S390 Version.
11bf311e	2	Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006
bb38d32c	3	Free Software Foundation, Inc.
847b055c AJ	4	Contributed by Carl Pederson & Martin Schwidefsky.
	5	This file is part of the GNU C Library.
	6
	7	The GNU C Library is free software; you can redistribute it and/or
41bdb6e2 AJ	8	modify it under the terms of the GNU Lesser General Public
	9	License as published by the Free Software Foundation; either
	10	version 2.1 of the License, or (at your option) any later version.
847b055c AJ	11
	12	The GNU C Library is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
41bdb6e2	15	Lesser General Public License for more details.
847b055c	16
41bdb6e2 AJ	17	You should have received a copy of the GNU Lesser General Public
	18	License along with the GNU C Library; if not, write to the Free
	19	Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	20	02111-1307 USA. */
847b055c AJ	21
	22	#ifndef dl_machine_h
	23	#define dl_machine_h
	24
847b055c AJ	25	#define ELF_MACHINE_NAME "s390"
	26
	27	#include <sys/param.h>
	28	#include <string.h>
	29	#include <link.h>
	30
9672b937 AJ	31	/* This is an older, now obsolete value. */
9672b937 AJ	32	#define EM_S390_OLD 0xA390
847b055c	33
ceb579a3	34	/* Return nonzero iff ELF header is compatible with the running host. */
847b055c	35	static inline int
ceb579a3	36	elf_machine_matches_host (const Elf32_Ehdr *ehdr)
847b055c	37	{
ffeac417 UD	38	return (ehdr->e_machine == EM_S390 \|\| ehdr->e_machine == EM_S390_OLD)
ffeac417 UD	39	&& ehdr->e_ident[EI_CLASS] == ELFCLASS32;
847b055c AJ	40	}
	41
	42
	43	/* Return the link-time address of _DYNAMIC. Conveniently, this is the
	44	first element of the GOT. This must be inlined in a function which
	45	uses global data. */
	46
	47	static inline Elf32_Addr
	48	elf_machine_dynamic (void)
	49	{
	50	register Elf32_Addr *got;
	51
	52	asm( " bras %0,2f\n"
	53	"1: .long _GLOBAL_OFFSET_TABLE_-1b\n"
	54	"2: al %0,0(%0)"
	55	: "=&a" (got) : : "0" );
	56
	57	return *got;
	58	}
	59
	60
	61	/* Return the run-time load address of the shared object. */
	62	static inline Elf32_Addr
	63	elf_machine_load_address (void)
	64	{
	65	Elf32_Addr addr;
	66
	67	asm( " bras 1,2f\n"
	68	"1: .long _GLOBAL_OFFSET_TABLE_ - 1b\n"
	69	" .long _dl_start - 1b - 0x80000000\n"
	70	"2: l %0,4(1)\n"
	71	" ar %0,1\n"
	72	" al 1,0(1)\n"
	73	" sl %0,_dl_start@GOT12(1)"
	74	: "=&d" (addr) : : "1" );
	75	return addr;
	76	}
	77
	78	/* Set up the loaded object described by L so its unrelocated PLT
	79	entries will jump to the on-demand fixup code in dl-runtime.c. */
	80
	81	static inline int __attribute__ ((unused))
	82	elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
	83	{
	84	extern void _dl_runtime_resolve (Elf32_Word);
	85	extern void _dl_runtime_profile (Elf32_Word);
	86
	87	if (l->l_info[DT_JMPREL] && lazy)
	88	{
	89	/* The GOT entries for functions in the PLT have not yet been filled
	90	in. Their initial contents will arrange when called to push an
	91	offset into the .rel.plt section, push _GLOBAL_OFFSET_TABLE_[1],
	92	and then jump to _GLOBAL_OFFSET_TABLE[2]. */
	93	Elf32_Addr *got;
	94	got = (Elf32_Addr *) D_PTR (l, l_info[DT_PLTGOT]);
32e6df36 UD	95	/* If a library is prelinked but we have to relocate anyway,
	96	we have to be able to undo the prelinking of .got.plt.
	97	The prelinker saved us here address of .plt + 0x2c. */
	98	if (got[1])
	99	{
	100	l->l_mach.plt = got[1] + l->l_addr;
	101	l->l_mach.gotplt = (Elf32_Addr) &got[3];
	102	}
847b055c AJ	103	got[1] = (Elf32_Addr) l; /* Identify this shared object. */
	104
	105	/* The got[2] entry contains the address of a function which gets
	106	called to get the address of a so far unresolved function and
	107	jump to it. The profiling extension of the dynamic linker allows
	108	to intercept the calls to collect information. In this case we
	109	don't store the address in the GOT so that all future calls also
	110	end in this function. */
	111	if (__builtin_expect (profile, 0))
	112	{
	113	got[2] = (Elf32_Addr) &_dl_runtime_profile;
	114
bb38d32c UD	115	if (GLRO(dl_profile) != NULL
bb38d32c UD	116	&& _dl_name_match_p (GLRO(dl_profile), l))
847b055c AJ	117	/* This is the object we are looking for. Say that we really
847b055c AJ	118	want profiling and the timers are started. */
5688da55	119	GL(dl_profile_map) = l;
847b055c AJ	120	}
	121	else
	122	/* This function will get called to fix up the GOT entry indicated by
	123	the offset on the stack, and then jump to the resolved address. */
	124	got[2] = (Elf32_Addr) &_dl_runtime_resolve;
	125	}
	126
	127	return lazy;
	128	}
	129
847b055c AJ	130	/* Mask identifying addresses reserved for the user program,
	131	where the dynamic linker should not map anything. */
	132	#define ELF_MACHINE_USER_ADDRESS_MASK 0xf8000000UL
	133
	134	/* Initial entry point code for the dynamic linker.
	135	The C function `_dl_start' is the real entry point;
	136	its return value is the user program's entry point. */
	137
	138	#define RTLD_START asm ("\n\
	139	.text\n\
	140	.align 4\n\
	141	.globl _start\n\
	142	.globl _dl_start_user\n\
	143	_start:\n\
	144	basr %r13,0\n\
	145	.L0: ahi %r13,.Llit-.L0\n\
	146	lr %r2,%r15\n\
	147	# Alloc stack frame\n\
	148	ahi %r15,-96\n\
	149	# Set the back chain to zero\n\
	150	xc 0(4,%r15),0(%r15)\n\
	151	# Call _dl_start with %r2 pointing to arg on stack\n\
	152	l %r14,.Ladr1-.Llit(%r13)\n\
	153	bas %r14,0(%r14,%r13) # call _dl_start\n\
	154	_dl_start_user:\n\
	155	# Save the user entry point address in %r8.\n\
	156	lr %r8,%r2\n\
	157	# Point %r12 at the GOT.\n\
	158	l %r12,.Ladr0-.Llit(%r13)\n\
	159	ar %r12,%r13\n\
847b055c AJ	160	# See if we were run as a command with the executable file\n\
	161	# name as an extra leading argument.\n\
	162	l %r1,_dl_skip_args@GOT12(0,%r12)\n\
	163	l %r1,0(%r1) # load _dl_skip_args\n\
	164	# Get the original argument count.\n\
	165	l %r0,96(%r15)\n\
	166	# Subtract _dl_skip_args from it.\n\
	167	sr %r0,%r1\n\
	168	# Adjust the stack pointer to skip _dl_skip_args words.\n\
	169	sll %r1,2\n\
	170	ar %r15,%r1\n\
	171	# Set the back chain to zero again\n\
	172	xc 0(4,%r15),0(%r15)\n\
	173	# Store back the modified argument count.\n\
	174	st %r0,96(%r15)\n\
	175	# The special initializer gets called with the stack just\n\
	176	# as the application's entry point will see it; it can\n\
	177	# switch stacks if it moves these contents over.\n\
	178	" RTLD_START_SPECIAL_INIT "\n\
	179	# Call the function to run the initializers.\n\
	180	# Load the parameters:\n\
	181	# (%r2, %r3, %r4, %r5) = (_dl_loaded, argc, argv, envp)\n\
0d01dace	182	l %r2,_rtld_local@GOT(%r12)\n\
847b055c AJ	183	l %r2,0(%r2)\n\
	184	l %r3,96(%r15)\n\
	185	la %r4,100(%r15)\n\
	186	lr %r5,%r3\n\
	187	sll %r5,2\n\
	188	la %r5,104(%r5,%r15)\n\
	189	l %r1,.Ladr4-.Llit(%r13)\n\
	190	bas %r14,0(%r1,%r13)\n\
	191	# Pass our finalizer function to the user in %r14, as per ELF ABI.\n\
	192	l %r14,_dl_fini@GOT(%r12)\n\
	193	# Free stack frame\n\
	194	ahi %r15,96\n\
	195	# Jump to the user's entry point (saved in %r8).\n\
	196	br %r8\n\
	197	.Llit:\n\
	198	.Ladr0: .long _GLOBAL_OFFSET_TABLE_-.Llit\n\
	199	.Ladr1: .long _dl_start-.Llit\n\
7969407a	200	.Ladr4: .long _dl_init_internal@PLT-.Llit\n\
847b055c AJ	201	");
	202
	203	#ifndef RTLD_START_SPECIAL_INIT
	204	#define RTLD_START_SPECIAL_INIT /* nothing */
	205	#endif
	206
e6ebd2e4 UD	207	/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or
	208	TLS variable, so undefined references should not be allowed to
	209	define the value.
cf5a372e UD	210	ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one
cf5a372e UD	211	of the main executable's symbols, as for a COPY reloc. */
11bf311e	212	#define elf_machine_type_class(type) \
e6ebd2e4 UD	213	((((type) == R_390_JMP_SLOT \|\| (type) == R_390_TLS_DTPMOD \
	214	\|\| (type) == R_390_TLS_DTPOFF \|\| (type) == R_390_TLS_TPOFF) \
	215	* ELF_RTYPE_CLASS_PLT) \
	216	\| (((type) == R_390_COPY) * ELF_RTYPE_CLASS_COPY))
847b055c AJ	217
	218	/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
	219	#define ELF_MACHINE_JMP_SLOT R_390_JMP_SLOT
	220
	221	/* The S390 never uses Elf32_Rel relocations. */
	222	#define ELF_MACHINE_NO_REL 1
	223
	224	/* The S390 overlaps DT_RELA and DT_PLTREL. */
	225	#define ELF_MACHINE_PLTREL_OVERLAP 1
	226
	227	/* We define an initialization functions. This is called very early in
	228	_dl_sysdep_start. */
	229	#define DL_PLATFORM_INIT dl_platform_init ()
	230
847b055c AJ	231	static inline void __attribute__ ((unused))
	232	dl_platform_init (void)
	233	{
afdca0f2	234	if (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0')
847b055c	235	/* Avoid an empty string which would disturb us. */
afdca0f2	236	GLRO(dl_platform) = NULL;
847b055c AJ	237	}
	238
	239	static inline Elf32_Addr
	240	elf_machine_fixup_plt (struct link_map *map, lookup_t t,
	241	const Elf32_Rela *reloc,
	242	Elf32_Addr *reloc_addr, Elf32_Addr value)
	243	{
	244	return *reloc_addr = value;
	245	}
	246
	247	/* Return the final value of a plt relocation. */
	248	static inline Elf32_Addr
	249	elf_machine_plt_value (struct link_map map, const Elf32_Rela reloc,
	250	Elf32_Addr value)
	251	{
	252	return value;
	253	}
	254
bb38d32c UD	255	/* Names of the architecture-specific auditing callback functions. */
	256	#define ARCH_LA_PLTENTER s390_32_gnu_pltenter
	257	#define ARCH_LA_PLTEXIT s390_32_gnu_pltexit
	258
847b055c AJ	259	#endif /* !dl_machine_h */
	260
	261
bb38d32c	262	#ifdef RESOLVE_MAP
847b055c AJ	263
	264	/* Perform the relocation specified by RELOC and SYM (which is fully resolved).
	265	MAP is the object containing the reloc. */
	266
bb38d32c UD	267	auto inline void
bb38d32c UD	268	__attribute__ ((always_inline))
847b055c	269	elf_machine_rela (struct link_map map, const Elf32_Rela reloc,
87d254a7 AO	270	const Elf32_Sym sym, const struct r_found_version version,
87d254a7 AO	271	void *const reloc_addr_arg)
847b055c	272	{
87d254a7	273	Elf32_Addr *const reloc_addr = reloc_addr_arg;
1721af3f UD	274	const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
1721af3f UD	275
e6ebd2e4	276	#if !defined RTLD_BOOTSTRAP \|\| !defined HAVE_Z_COMBRELOC
1721af3f	277	if (__builtin_expect (r_type == R_390_RELATIVE, 0))
e6ebd2e4 UD	278	{
	279	# if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC
	280	/* This is defined in rtld.c, but nowhere in the static libc.a;
	281	make the reference weak so static programs can still link.
	282	This declaration cannot be done when compiling rtld.c
	283	(i.e. #ifdef RTLD_BOOTSTRAP) because rtld.c contains the
	284	common defn for _dl_rtld_map, which is incompatible with a
	285	weak decl in the same file. */
	286	# ifndef SHARED
	287	weak_extern (GL(dl_rtld_map));
	288	# endif
	289	if (map != &GL(dl_rtld_map)) /* Already done in rtld itself. */
	290	# endif
	291	*reloc_addr = map->l_addr + reloc->r_addend;
	292	}
	293	else
847b055c	294	#endif
e6ebd2e4 UD	295	if (__builtin_expect (r_type == R_390_NONE, 0))
e6ebd2e4 UD	296	return;
1721af3f	297	else
847b055c	298	{
d347a4ab	299	#ifndef RESOLVE_CONFLICT_FIND_MAP
847b055c	300	const Elf32_Sym *const refsym = sym;
d347a4ab	301	#endif
e6ebd2e4 UD	302	struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type);
e6ebd2e4 UD	303	Elf32_Addr value = sym == NULL ? 0 : sym_map->l_addr + sym->st_value;
847b055c	304
1721af3f	305	switch (r_type)
847b055c	306	{
c612d994 UD	307	case R_390_GLOB_DAT:
c612d994 UD	308	case R_390_JMP_SLOT:
e6ebd2e4 UD	309	*reloc_addr = value + reloc->r_addend;
	310	break;
	311
11bf311e	312	#if (!defined RTLD_BOOTSTRAP \|\| USE___THREAD) \
8e27f45e	313	&& !defined RESOLVE_CONFLICT_FIND_MAP
e6ebd2e4 UD	314	case R_390_TLS_DTPMOD:
	315	# ifdef RTLD_BOOTSTRAP
	316	/* During startup the dynamic linker is always the module
	317	with index 1.
	318	XXX If this relocation is necessary move before RESOLVE
	319	call. */
	320	*reloc_addr = 1;
	321	# else
	322	/* Get the information from the link map returned by the
	323	resolv function. */
	324	if (sym_map != NULL)
	325	*reloc_addr = sym_map->l_tls_modid;
	326	# endif
	327	break;
	328	case R_390_TLS_DTPOFF:
	329	# ifndef RTLD_BOOTSTRAP
	330	/* During relocation all TLS symbols are defined and used.
	331	Therefore the offset is already correct. */
	332	if (sym != NULL)
	333	*reloc_addr = sym->st_value + reloc->r_addend;
	334	# endif
c612d994	335	break;
e6ebd2e4 UD	336	case R_390_TLS_TPOFF:
	337	/* The offset is negative, forward from the thread pointer. */
	338	# ifdef RTLD_BOOTSTRAP
	339	*reloc_addr = sym->st_value + reloc->r_addend - map->l_tls_offset;
	340	# else
	341	/* We know the offset of the object the symbol is contained in.
	342	It is a negative value which will be added to the
	343	thread pointer. */
	344	if (sym != NULL)
	345	{
	346	CHECK_STATIC_TLS (map, sym_map);
	347	*reloc_addr = (sym->st_value + reloc->r_addend
	348	- sym_map->l_tls_offset);
	349	}
	350	#endif
	351	break;
	352	#endif /* use TLS */
	353
c612d994	354	#ifndef RTLD_BOOTSTRAP
8e27f45e RM	355	# ifndef RESOLVE_CONFLICT_FIND_MAP
8e27f45e RM	356	/* Not needed in dl-conflict.c. */
847b055c AJ	357	case R_390_COPY:
	358	if (sym == NULL)
	359	/* This can happen in trace mode if an object could not be
	360	found. */
	361	break;
	362	if (__builtin_expect (sym->st_size > refsym->st_size, 0)
	363	\|\| (__builtin_expect (sym->st_size < refsym->st_size, 0)
afdca0f2	364	&& __builtin_expect (GLRO(dl_verbose), 0)))
847b055c AJ	365	{
	366	const char *strtab;
	367
	368	strtab = (const char *) D_PTR(map,l_info[DT_STRTAB]);
35fc382a UD	369	_dl_error_printf ("\
35fc382a UD	370	%s: Symbol `%s' has different size in shared object, consider re-linking\n",
e6caf4e1	371	rtld_progname ?: "<program name unknown>",
35fc382a	372	strtab + refsym->st_name);
847b055c	373	}
87d254a7 AO	374	memcpy (reloc_addr_arg, (void *) value,
87d254a7 AO	375	MIN (sym->st_size, refsym->st_size));
847b055c	376	break;
8e27f45e	377	# endif
847b055c	378	case R_390_32:
c612d994 UD	379	*reloc_addr = value + reloc->r_addend;
	380	break;
	381	case R_390_16:
	382	(unsigned short ) reloc_addr = value + reloc->r_addend;
	383	break;
	384	case R_390_8:
	385	(char ) reloc_addr = value + reloc->r_addend;
	386	break;
8e27f45e	387	# ifndef RESOLVE_CONFLICT_FIND_MAP
847b055c	388	case R_390_PC32:
f4f8cd2c	389	*reloc_addr = value + reloc->r_addend - (Elf32_Addr) reloc_addr;
847b055c	390	break;
c612d994 UD	391	case R_390_PC16DBL:
	392	case R_390_PLT16DBL:
	393	(unsigned short ) reloc_addr = (unsigned short)
	394	((short) (value + reloc->r_addend - (Elf32_Addr) reloc_addr) >> 1);
	395	break;
	396	case R_390_PC16:
	397	(unsigned short ) reloc_addr =
	398	value + reloc->r_addend - (Elf32_Addr) reloc_addr;
	399	break;
847b055c AJ	400	case R_390_NONE:
847b055c AJ	401	break;
8e27f45e	402	# endif
c612d994 UD	403	#endif
c612d994 UD	404	#if !defined(RTLD_BOOTSTRAP) \|\| defined(_NDEBUG)
847b055c	405	default:
c612d994 UD	406	/* We add these checks in the version to relocate ld.so only
c612d994 UD	407	if we are still debugging. */
1721af3f	408	_dl_reloc_bad_type (map, r_type, 0);
847b055c	409	break;
c612d994	410	#endif
847b055c AJ	411	}
	412	}
	413	}
	414
bb38d32c UD	415	auto inline void
bb38d32c UD	416	__attribute__ ((always_inline))
7c69dc8b	417	elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc,
87d254a7	418	void *const reloc_addr_arg)
1721af3f	419	{
87d254a7	420	Elf32_Addr *const reloc_addr = reloc_addr_arg;
1721af3f UD	421	*reloc_addr = l_addr + reloc->r_addend;
1721af3f UD	422	}
847b055c	423
bb38d32c UD	424	auto inline void
bb38d32c UD	425	__attribute__ ((always_inline))
847b055c AJ	426	elf_machine_lazy_rel (struct link_map *map,
	427	Elf32_Addr l_addr, const Elf32_Rela *reloc)
	428	{
	429	Elf32_Addr const reloc_addr = (void ) (l_addr + reloc->r_offset);
1721af3f	430	const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
847b055c	431	/* Check for unexpected PLT reloc type. */
107d41a9	432	if (__builtin_expect (r_type == R_390_JMP_SLOT, 1))
32e6df36 UD	433	{
	434	if (__builtin_expect (map->l_mach.plt, 0) == 0)
	435	*reloc_addr += l_addr;
	436	else
	437	*reloc_addr =
	438	map->l_mach.plt
	439	+ (((Elf32_Addr) reloc_addr) - map->l_mach.gotplt) * 8;
	440	}
847b055c	441	else
1721af3f	442	_dl_reloc_bad_type (map, r_type, 1);
847b055c AJ	443	}
847b055c AJ	444
bb38d32c	445	#endif /* RESOLVE_MAP */