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

/* Machine-dependent ELF dynamic relocation inline functions.  S390 Version.
   Copyright (C) 2000-2019 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, see
   <http://www.gnu.org/licenses/>.  */

#ifndef dl_machine_h
#define dl_machine_h

#define ELF_MACHINE_NAME "s390"

#include <sys/param.h>
#include <string.h>
#include <link.h>
#include <sysdeps/s390/dl-procinfo.h>
#include <dl-irel.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)
{
  /* Check if the kernel provides the high gpr facility if needed by
     the binary.  */
  if ((ehdr->e_flags & EF_S390_HIGH_GPRS)
      && !(GLRO (dl_hwcap) & HWCAP_S390_HIGH_GPRS))
    return 0;

  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) & 0x00000000ffffffff\n"
	   "2: l     %0,4(1)\n"
	   "   ar    %0,1\n"
	   "   al    1,0(1)\n"
	   "   sl    %0,_dl_start@GOT(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 defined HAVE_S390_VX_ASM_SUPPORT
  extern void _dl_runtime_resolve_vx (Elf32_Word);
  extern void _dl_runtime_profile_vx (Elf32_Word);
#endif


  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.jmprel = (const Elf32_Rela *) D_PTR (l, l_info[DT_JMPREL]);
	}
      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 (__glibc_unlikely (profile))
	{
#if defined HAVE_S390_VX_ASM_SUPPORT
	  if (GLRO(dl_hwcap) & HWCAP_S390_VX)
	    got[2] = (Elf32_Addr) &_dl_runtime_profile_vx;
	  else
	    got[2] = (Elf32_Addr) &_dl_runtime_profile;
#else
	  got[2] = (Elf32_Addr) &_dl_runtime_profile;
#endif

	  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.  */
#if defined HAVE_S390_VX_ASM_SUPPORT
	  if (GLRO(dl_hwcap) & HWCAP_S390_VX)
	    got[2] = (Elf32_Addr) &_dl_runtime_resolve_vx;
	  else
	    got[2] = (Elf32_Addr) &_dl_runtime_resolve;
#else
	  got[2] = (Elf32_Addr) &_dl_runtime_resolve;
#endif
	}
    }

  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\
0:      ahi   %r13,.Llit-0b\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@GOT(%r12)\n\
	l     %r1,0(%r1)	# load _dl_skip_args\n\
	ltr   %r1,%r1\n\
	je    4f		# Skip the arg adjustment if there were none.\n\
	# Get the original argument count.\n\
	l     %r0,96(%r15)\n\
	# Subtract _dl_skip_args from it.\n\
	sr    %r0,%r1\n\
	# Store back the modified argument count.\n\
	st    %r0,96(%r15)\n\
	# Copy argv and envp forward to account for skipped argv entries.\n\
	# We skipped at least one argument or we would not get here.\n\
	la    %r6,100(%r15)	# Destination pointer i.e. &argv[0]\n\
	lr    %r5,%r6\n\
	lr    %r0,%r1\n\
	sll   %r0,2\n		# Number of skipped bytes.\n\
	ar    %r5,%r0		# Source pointer = Dest + Skipped args.\n\
	# argv copy loop:\n\
1:	l     %r7,0(%r5)	# Load a word from the source.\n\
	st    %r7,0(%r6)	# Store the word in the destination.\n\
	ahi   %r5,4\n\
	ahi   %r6,4\n\
	ltr   %r7,%r7\n\
	jne   1b		# Stop after copying the NULL.\n\
	# envp copy loop:\n\
2:	l     %r7,0(%r5)	# Load a word from the source.\n\
	st    %r7,0(%r6)	# Store the word in the destination.\n\
	ahi   %r5,4\n\
	ahi   %r6,4\n\
	ltr   %r7,%r7\n\
	jne   2b		# Stop after copying the NULL.\n\
	# Now we have to zero out the envp entries after NULL to allow\n\
	# start.S to properly find auxv by skipping zeroes.\n\
	# zero out loop:\n\
	lhi   %r7,0\n\
3:	st    %r7,0(%r6)	# Store zero.\n\
	ahi   %r6,4		# Advance dest pointer.\n\
	ahi   %r1,-1		# Subtract one from the word count.\n\
	ltr   %r1,%r1\n\
	jne    3b		# Keep copying if the word count is non-zero.\n\
	# Adjust _dl_argv\n\
	la    %r6,100(%r15)\n\
	l     %r1,_dl_argv@GOT(%r12)\n\
	st    %r6,0(%r1)\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\
4:	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@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_COPY 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
#define ELF_MACHINE_NO_RELA 0

/* 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 ElfW(Sym) *refsym, const ElfW(Sym) *sym,
		       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, int skip_ifunc)
{
  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 (__glibc_unlikely (r_type == R_390_RELATIVE))
    {
# 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 (__glibc_unlikely (r_type == R_390_NONE))
    return;
  else
    {
#if !defined RTLD_BOOTSTRAP && !defined RESOLVE_CONFLICT_FIND_MAP
      /* Only needed for R_390_COPY below.  */
      const Elf32_Sym *const refsym = sym;
#endif
      struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type);
      Elf32_Addr value = SYMBOL_ADDRESS (sym_map, sym, true);

      if (sym != NULL
	  && __builtin_expect (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC, 0)
	  && __builtin_expect (sym->st_shndx != SHN_UNDEF, 1)
	  && __builtin_expect (!skip_ifunc, 1))
	value = elf_ifunc_invoke (value);

      switch (r_type)
	{
	case R_390_IRELATIVE:
	  value = map->l_addr + reloc->r_addend;
	  if (__glibc_likely (!skip_ifunc))
	    value = elf_ifunc_invoke (value);
	  *reloc_addr = value;
	  break;

	case R_390_GLOB_DAT:
	case R_390_JMP_SLOT:
	  *reloc_addr = value + reloc->r_addend;
	  break;

#ifndef 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, 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:
	  *(unsigned short *) reloc_addr = (unsigned short)
	    ((short) (value + reloc->r_addend - (Elf32_Addr) reloc_addr) >> 1);
	  break;
	case R_390_PC32DBL:
	  *(unsigned int *) reloc_addr = (unsigned int)
	    ((int) (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,
		      int skip_ifunc)
{
  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 (__glibc_likely (r_type == R_390_JMP_SLOT))
    {
      if (__builtin_expect (map->l_mach.plt, 0) == 0)
	*reloc_addr += l_addr;
      else
	*reloc_addr = map->l_mach.plt + (reloc - map->l_mach.jmprel) * 32;
    }
  else if (__glibc_likely (r_type == R_390_IRELATIVE))
    {
      Elf32_Addr value = map->l_addr + reloc->r_addend;
      if (__glibc_likely (!skip_ifunc))
	value = elf_ifunc_invoke (value);
      *reloc_addr = value;
    }
  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.
04277e02	2	Copyright (C) 2000-2019 Free Software Foundation, Inc.
847b055c AJ	3	Contributed by Carl Pederson & Martin Schwidefsky.
	4	This file is part of the GNU C Library.
	5
	6	The GNU C Library is free software; you can redistribute it and/or
41bdb6e2 AJ	7	modify it under the terms of the GNU Lesser General Public
	8	License as published by the Free Software Foundation; either
	9	version 2.1 of the License, or (at your option) any later version.
847b055c AJ	10
	11	The GNU C Library is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
41bdb6e2	14	Lesser General Public License for more details.
847b055c	15
41bdb6e2	16	You should have received a copy of the GNU Lesser General Public
59ba27a6 PE	17	License along with the GNU C Library; if not, see
59ba27a6 PE	18	<http://www.gnu.org/licenses/>. */
847b055c AJ	19
	20	#ifndef dl_machine_h
	21	#define dl_machine_h
	22
847b055c AJ	23	#define ELF_MACHINE_NAME "s390"
	24
	25	#include <sys/param.h>
	26	#include <string.h>
	27	#include <link.h>
7760ccce	28	#include <sysdeps/s390/dl-procinfo.h>
08f43f9b	29	#include <dl-irel.h>
847b055c	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	{
7760ccce AK	38	/* Check if the kernel provides the high gpr facility if needed by
	39	the binary. */
	40	if ((ehdr->e_flags & EF_S390_HIGH_GPRS)
	41	&& !(GLRO (dl_hwcap) & HWCAP_S390_HIGH_GPRS))
	42	return 0;
	43
ffeac417	44	return (ehdr->e_machine == EM_S390 \|\| ehdr->e_machine == EM_S390_OLD)
d063d164	45	&& ehdr->e_ident[EI_CLASS] == ELFCLASS32;
847b055c AJ	46	}
	47
	48
	49	/* Return the link-time address of _DYNAMIC. Conveniently, this is the
	50	first element of the GOT. This must be inlined in a function which
	51	uses global data. */
	52
	53	static inline Elf32_Addr
	54	elf_machine_dynamic (void)
	55	{
	56	register Elf32_Addr *got;
	57
31cf3942 SL	58	__asm__( " bras %0,2f\n"
	59	"1: .long _GLOBAL_OFFSET_TABLE_-1b\n"
	60	"2: al %0,0(%0)"
	61	: "=&a" (got) : : "0" );
847b055c AJ	62
	63	return *got;
	64	}
	65
	66
	67	/* Return the run-time load address of the shared object. */
	68	static inline Elf32_Addr
	69	elf_machine_load_address (void)
	70	{
	71	Elf32_Addr addr;
	72
31cf3942 SL	73	__asm__( " bras 1,2f\n"
	74	"1: .long _GLOBAL_OFFSET_TABLE_ - 1b\n"
	75	" .long (_dl_start - 1b - 0x80000000) & 0x00000000ffffffff\n"
	76	"2: l %0,4(1)\n"
	77	" ar %0,1\n"
	78	" al 1,0(1)\n"
	79	" sl %0,_dl_start@GOT(1)"
	80	: "=&d" (addr) : : "1" );
847b055c AJ	81	return addr;
	82	}
	83
	84	/* Set up the loaded object described by L so its unrelocated PLT
	85	entries will jump to the on-demand fixup code in dl-runtime.c. */
	86
	87	static inline int __attribute__ ((unused))
	88	elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
	89	{
	90	extern void _dl_runtime_resolve (Elf32_Word);
	91	extern void _dl_runtime_profile (Elf32_Word);
4603c51e SL	92	#if defined HAVE_S390_VX_ASM_SUPPORT
	93	extern void _dl_runtime_resolve_vx (Elf32_Word);
	94	extern void _dl_runtime_profile_vx (Elf32_Word);
	95	#endif
	96
847b055c AJ	97
	98	if (l->l_info[DT_JMPREL] && lazy)
	99	{
	100	/* The GOT entries for functions in the PLT have not yet been filled
	101	in. Their initial contents will arrange when called to push an
	102	offset into the .rel.plt section, push _GLOBAL_OFFSET_TABLE_[1],
	103	and then jump to _GLOBAL_OFFSET_TABLE[2]. */
	104	Elf32_Addr *got;
	105	got = (Elf32_Addr *) D_PTR (l, l_info[DT_PLTGOT]);
32e6df36 UD	106	/* If a library is prelinked but we have to relocate anyway,
	107	we have to be able to undo the prelinking of .got.plt.
	108	The prelinker saved us here address of .plt + 0x2c. */
	109	if (got[1])
	110	{
	111	l->l_mach.plt = got[1] + l->l_addr;
dd8f8da9	112	l->l_mach.jmprel = (const Elf32_Rela *) D_PTR (l, l_info[DT_JMPREL]);
32e6df36	113	}
847b055c AJ	114	got[1] = (Elf32_Addr) l; /* Identify this shared object. */
	115
	116	/* The got[2] entry contains the address of a function which gets
	117	called to get the address of a so far unresolved function and
	118	jump to it. The profiling extension of the dynamic linker allows
	119	to intercept the calls to collect information. In this case we
	120	don't store the address in the GOT so that all future calls also
	121	end in this function. */
a1ffb40e	122	if (__glibc_unlikely (profile))
847b055c	123	{
4603c51e SL	124	#if defined HAVE_S390_VX_ASM_SUPPORT
	125	if (GLRO(dl_hwcap) & HWCAP_S390_VX)
	126	got[2] = (Elf32_Addr) &_dl_runtime_profile_vx;
	127	else
	128	got[2] = (Elf32_Addr) &_dl_runtime_profile;
	129	#else
847b055c	130	got[2] = (Elf32_Addr) &_dl_runtime_profile;
4603c51e	131	#endif
847b055c	132
bb38d32c UD	133	if (GLRO(dl_profile) != NULL
bb38d32c UD	134	&& _dl_name_match_p (GLRO(dl_profile), l))
847b055c AJ	135	/* This is the object we are looking for. Say that we really
847b055c AJ	136	want profiling and the timers are started. */
5688da55	137	GL(dl_profile_map) = l;
847b055c AJ	138	}
847b055c AJ	139	else
4603c51e SL	140	{
	141	/* This function will get called to fix up the GOT entry indicated by
	142	the offset on the stack, and then jump to the resolved address. */
	143	#if defined HAVE_S390_VX_ASM_SUPPORT
	144	if (GLRO(dl_hwcap) & HWCAP_S390_VX)
	145	got[2] = (Elf32_Addr) &_dl_runtime_resolve_vx;
	146	else
	147	got[2] = (Elf32_Addr) &_dl_runtime_resolve;
	148	#else
	149	got[2] = (Elf32_Addr) &_dl_runtime_resolve;
	150	#endif
	151	}
847b055c AJ	152	}
	153
	154	return lazy;
	155	}
	156
847b055c AJ	157	/* Mask identifying addresses reserved for the user program,
	158	where the dynamic linker should not map anything. */
	159	#define ELF_MACHINE_USER_ADDRESS_MASK 0xf8000000UL
	160
	161	/* Initial entry point code for the dynamic linker.
	162	The C function `_dl_start' is the real entry point;
	163	its return value is the user program's entry point. */
	164
31cf3942	165	#define RTLD_START __asm__ ("\n\
847b055c AJ	166	.text\n\
	167	.align 4\n\
	168	.globl _start\n\
	169	.globl _dl_start_user\n\
	170	_start:\n\
	171	basr %r13,0\n\
20ed0d26	172	0: ahi %r13,.Llit-0b\n\
847b055c AJ	173	lr %r2,%r15\n\
	174	# Alloc stack frame\n\
	175	ahi %r15,-96\n\
	176	# Set the back chain to zero\n\
	177	xc 0(4,%r15),0(%r15)\n\
	178	# Call _dl_start with %r2 pointing to arg on stack\n\
	179	l %r14,.Ladr1-.Llit(%r13)\n\
	180	bas %r14,0(%r14,%r13) # call _dl_start\n\
	181	_dl_start_user:\n\
	182	# Save the user entry point address in %r8.\n\
	183	lr %r8,%r2\n\
	184	# Point %r12 at the GOT.\n\
	185	l %r12,.Ladr0-.Llit(%r13)\n\
	186	ar %r12,%r13\n\
847b055c AJ	187	# See if we were run as a command with the executable file\n\
847b055c AJ	188	# name as an extra leading argument.\n\
2581b98e	189	l %r1,_dl_skip_args@GOT(%r12)\n\
533bb7c2 SP	190	l %r1,0(%r1) # load _dl_skip_args\n\
533bb7c2 SP	191	ltr %r1,%r1\n\
20ed0d26	192	je 4f # Skip the arg adjustment if there were none.\n\
847b055c AJ	193	# Get the original argument count.\n\
	194	l %r0,96(%r15)\n\
	195	# Subtract _dl_skip_args from it.\n\
	196	sr %r0,%r1\n\
847b055c AJ	197	# Store back the modified argument count.\n\
847b055c AJ	198	st %r0,96(%r15)\n\
533bb7c2 SP	199	# Copy argv and envp forward to account for skipped argv entries.\n\
	200	# We skipped at least one argument or we would not get here.\n\
	201	la %r6,100(%r15) # Destination pointer i.e. &argv[0]\n\
	202	lr %r5,%r6\n\
	203	lr %r0,%r1\n\
	204	sll %r0,2\n # Number of skipped bytes.\n\
	205	ar %r5,%r0 # Source pointer = Dest + Skipped args.\n\
	206	# argv copy loop:\n\
20ed0d26	207	1: l %r7,0(%r5) # Load a word from the source.\n\
533bb7c2 SP	208	st %r7,0(%r6) # Store the word in the destination.\n\
	209	ahi %r5,4\n\
	210	ahi %r6,4\n\
	211	ltr %r7,%r7\n\
20ed0d26	212	jne 1b # Stop after copying the NULL.\n\
533bb7c2	213	# envp copy loop:\n\
20ed0d26	214	2: l %r7,0(%r5) # Load a word from the source.\n\
533bb7c2 SP	215	st %r7,0(%r6) # Store the word in the destination.\n\
	216	ahi %r5,4\n\
	217	ahi %r6,4\n\
	218	ltr %r7,%r7\n\
20ed0d26	219	jne 2b # Stop after copying the NULL.\n\
533bb7c2 SP	220	# Now we have to zero out the envp entries after NULL to allow\n\
	221	# start.S to properly find auxv by skipping zeroes.\n\
	222	# zero out loop:\n\
	223	lhi %r7,0\n\
20ed0d26	224	3: st %r7,0(%r6) # Store zero.\n\
533bb7c2 SP	225	ahi %r6,4 # Advance dest pointer.\n\
	226	ahi %r1,-1 # Subtract one from the word count.\n\
	227	ltr %r1,%r1\n\
20ed0d26	228	jne 3b # Keep copying if the word count is non-zero.\n\
533bb7c2 SP	229	# Adjust _dl_argv\n\
	230	la %r6,100(%r15)\n\
	231	l %r1,_dl_argv@GOT(%r12)\n\
	232	st %r6,0(%r1)\n\
847b055c AJ	233	# The special initializer gets called with the stack just\n\
	234	# as the application's entry point will see it; it can\n\
	235	# switch stacks if it moves these contents over.\n\
	236	" RTLD_START_SPECIAL_INIT "\n\
	237	# Call the function to run the initializers.\n\
	238	# Load the parameters:\n\
	239	# (%r2, %r3, %r4, %r5) = (_dl_loaded, argc, argv, envp)\n\
20ed0d26	240	4: l %r2,_rtld_local@GOT(%r12)\n\
847b055c AJ	241	l %r2,0(%r2)\n\
	242	l %r3,96(%r15)\n\
	243	la %r4,100(%r15)\n\
	244	lr %r5,%r3\n\
	245	sll %r5,2\n\
	246	la %r5,104(%r5,%r15)\n\
	247	l %r1,.Ladr4-.Llit(%r13)\n\
	248	bas %r14,0(%r1,%r13)\n\
	249	# Pass our finalizer function to the user in %r14, as per ELF ABI.\n\
	250	l %r14,_dl_fini@GOT(%r12)\n\
	251	# Free stack frame\n\
	252	ahi %r15,96\n\
	253	# Jump to the user's entry point (saved in %r8).\n\
	254	br %r8\n\
	255	.Llit:\n\
	256	.Ladr0: .long _GLOBAL_OFFSET_TABLE_-.Llit\n\
	257	.Ladr1: .long _dl_start-.Llit\n\
c5684fdb	258	.Ladr4: .long _dl_init@PLT-.Llit\n\
847b055c AJ	259	");
	260
	261	#ifndef RTLD_START_SPECIAL_INIT
	262	#define RTLD_START_SPECIAL_INIT /* nothing */
	263	#endif
	264
e6ebd2e4 UD	265	/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or
	266	TLS variable, so undefined references should not be allowed to
	267	define the value.
209826bc	268	ELF_RTYPE_CLASS_COPY iff TYPE should not be allowed to resolve to one
cf5a372e	269	of the main executable's symbols, as for a COPY reloc. */
11bf311e	270	#define elf_machine_type_class(type) \
e6ebd2e4 UD	271	((((type) == R_390_JMP_SLOT \|\| (type) == R_390_TLS_DTPMOD \
	272	\|\| (type) == R_390_TLS_DTPOFF \|\| (type) == R_390_TLS_TPOFF) \
	273	* ELF_RTYPE_CLASS_PLT) \
	274	\| (((type) == R_390_COPY) * ELF_RTYPE_CLASS_COPY))
847b055c AJ	275
	276	/* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
	277	#define ELF_MACHINE_JMP_SLOT R_390_JMP_SLOT
	278
	279	/* The S390 never uses Elf32_Rel relocations. */
	280	#define ELF_MACHINE_NO_REL 1
4cf5b6d0	281	#define ELF_MACHINE_NO_RELA 0
847b055c	282
847b055c AJ	283	/* We define an initialization functions. This is called very early in
	284	_dl_sysdep_start. */
	285	#define DL_PLATFORM_INIT dl_platform_init ()
	286
847b055c AJ	287	static inline void __attribute__ ((unused))
	288	dl_platform_init (void)
	289	{
afdca0f2	290	if (GLRO(dl_platform) != NULL && *GLRO(dl_platform) == '\0')
847b055c	291	/* Avoid an empty string which would disturb us. */
afdca0f2	292	GLRO(dl_platform) = NULL;
847b055c AJ	293	}
	294
	295	static inline Elf32_Addr
	296	elf_machine_fixup_plt (struct link_map *map, lookup_t t,
0572433b	297	const ElfW(Sym) refsym, const ElfW(Sym) sym,
847b055c AJ	298	const Elf32_Rela *reloc,
	299	Elf32_Addr *reloc_addr, Elf32_Addr value)
	300	{
	301	return *reloc_addr = value;
	302	}
	303
	304	/* Return the final value of a plt relocation. */
	305	static inline Elf32_Addr
	306	elf_machine_plt_value (struct link_map map, const Elf32_Rela reloc,
	307	Elf32_Addr value)
	308	{
	309	return value;
	310	}
	311
bb38d32c UD	312	/* Names of the architecture-specific auditing callback functions. */
	313	#define ARCH_LA_PLTENTER s390_32_gnu_pltenter
	314	#define ARCH_LA_PLTEXIT s390_32_gnu_pltexit
	315
847b055c AJ	316	#endif /* !dl_machine_h */
	317
	318
bb38d32c	319	#ifdef RESOLVE_MAP
847b055c AJ	320
	321	/* Perform the relocation specified by RELOC and SYM (which is fully resolved).
	322	MAP is the object containing the reloc. */
	323
bb38d32c UD	324	auto inline void
bb38d32c UD	325	__attribute__ ((always_inline))
847b055c	326	elf_machine_rela (struct link_map map, const Elf32_Rela reloc,
87d254a7	327	const Elf32_Sym sym, const struct r_found_version version,
3a62d00d	328	void *const reloc_addr_arg, int skip_ifunc)
847b055c	329	{
87d254a7	330	Elf32_Addr *const reloc_addr = reloc_addr_arg;
1721af3f UD	331	const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
1721af3f UD	332
e6ebd2e4	333	#if !defined RTLD_BOOTSTRAP \|\| !defined HAVE_Z_COMBRELOC
a1ffb40e	334	if (__glibc_unlikely (r_type == R_390_RELATIVE))
e6ebd2e4 UD	335	{
	336	# if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC
	337	/* This is defined in rtld.c, but nowhere in the static libc.a;
	338	make the reference weak so static programs can still link.
	339	This declaration cannot be done when compiling rtld.c
	340	(i.e. #ifdef RTLD_BOOTSTRAP) because rtld.c contains the
	341	common defn for _dl_rtld_map, which is incompatible with a
	342	weak decl in the same file. */
	343	# ifndef SHARED
	344	weak_extern (GL(dl_rtld_map));
	345	# endif
	346	if (map != &GL(dl_rtld_map)) /* Already done in rtld itself. */
	347	# endif
	348	*reloc_addr = map->l_addr + reloc->r_addend;
	349	}
	350	else
847b055c	351	#endif
a1ffb40e	352	if (__glibc_unlikely (r_type == R_390_NONE))
e6ebd2e4	353	return;
1721af3f	354	else
847b055c	355	{
c5eebdd0 AK	356	#if !defined RTLD_BOOTSTRAP && !defined RESOLVE_CONFLICT_FIND_MAP
c5eebdd0 AK	357	/* Only needed for R_390_COPY below. */
847b055c	358	const Elf32_Sym *const refsym = sym;
d347a4ab	359	#endif
e6ebd2e4	360	struct link_map *sym_map = RESOLVE_MAP (&sym, version, r_type);
10a446dd	361	Elf32_Addr value = SYMBOL_ADDRESS (sym_map, sym, true);
847b055c	362
08f43f9b AK	363	if (sym != NULL
	364	&& __builtin_expect (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC, 0)
	365	&& __builtin_expect (sym->st_shndx != SHN_UNDEF, 1)
	366	&& __builtin_expect (!skip_ifunc, 1))
	367	value = elf_ifunc_invoke (value);
	368
1721af3f	369	switch (r_type)
847b055c	370	{
08f43f9b AK	371	case R_390_IRELATIVE:
08f43f9b AK	372	value = map->l_addr + reloc->r_addend;
a1ffb40e	373	if (__glibc_likely (!skip_ifunc))
08f43f9b AK	374	value = elf_ifunc_invoke (value);
	375	*reloc_addr = value;
	376	break;
	377
c612d994 UD	378	case R_390_GLOB_DAT:
c612d994 UD	379	case R_390_JMP_SLOT:
e6ebd2e4 UD	380	*reloc_addr = value + reloc->r_addend;
	381	break;
	382
d063d164	383	#ifndef RESOLVE_CONFLICT_FIND_MAP
e6ebd2e4 UD	384	case R_390_TLS_DTPMOD:
	385	# ifdef RTLD_BOOTSTRAP
	386	/* During startup the dynamic linker is always the module
	387	with index 1.
	388	XXX If this relocation is necessary move before RESOLVE
	389	call. */
	390	*reloc_addr = 1;
	391	# else
	392	/* Get the information from the link map returned by the
	393	resolv function. */
	394	if (sym_map != NULL)
	395	*reloc_addr = sym_map->l_tls_modid;
	396	# endif
	397	break;
	398	case R_390_TLS_DTPOFF:
	399	# ifndef RTLD_BOOTSTRAP
	400	/* During relocation all TLS symbols are defined and used.
	401	Therefore the offset is already correct. */
	402	if (sym != NULL)
	403	*reloc_addr = sym->st_value + reloc->r_addend;
	404	# endif
c612d994	405	break;
e6ebd2e4 UD	406	case R_390_TLS_TPOFF:
	407	/* The offset is negative, forward from the thread pointer. */
	408	# ifdef RTLD_BOOTSTRAP
	409	*reloc_addr = sym->st_value + reloc->r_addend - map->l_tls_offset;
	410	# else
	411	/* We know the offset of the object the symbol is contained in.
	412	It is a negative value which will be added to the
	413	thread pointer. */
	414	if (sym != NULL)
	415	{
	416	CHECK_STATIC_TLS (map, sym_map);
	417	*reloc_addr = (sym->st_value + reloc->r_addend
	418	- sym_map->l_tls_offset);
	419	}
	420	#endif
	421	break;
	422	#endif /* use TLS */
	423
c612d994	424	#ifndef RTLD_BOOTSTRAP
8e27f45e RM	425	# ifndef RESOLVE_CONFLICT_FIND_MAP
8e27f45e RM	426	/* Not needed in dl-conflict.c. */
847b055c AJ	427	case R_390_COPY:
	428	if (sym == NULL)
	429	/* This can happen in trace mode if an object could not be
	430	found. */
	431	break;
	432	if (__builtin_expect (sym->st_size > refsym->st_size, 0)
	433	\|\| (__builtin_expect (sym->st_size < refsym->st_size, 0)
afdca0f2	434	&& __builtin_expect (GLRO(dl_verbose), 0)))
847b055c AJ	435	{
	436	const char *strtab;
	437
	438	strtab = (const char *) D_PTR(map,l_info[DT_STRTAB]);
35fc382a UD	439	_dl_error_printf ("\
35fc382a UD	440	%s: Symbol `%s' has different size in shared object, consider re-linking\n",
b9375348	441	RTLD_PROGNAME, strtab + refsym->st_name);
847b055c	442	}
87d254a7 AO	443	memcpy (reloc_addr_arg, (void *) value,
87d254a7 AO	444	MIN (sym->st_size, refsym->st_size));
847b055c	445	break;
8e27f45e	446	# endif
847b055c	447	case R_390_32:
c612d994 UD	448	*reloc_addr = value + reloc->r_addend;
	449	break;
	450	case R_390_16:
	451	(unsigned short ) reloc_addr = value + reloc->r_addend;
	452	break;
	453	case R_390_8:
	454	(char ) reloc_addr = value + reloc->r_addend;
	455	break;
8e27f45e	456	# ifndef RESOLVE_CONFLICT_FIND_MAP
847b055c	457	case R_390_PC32:
f4f8cd2c	458	*reloc_addr = value + reloc->r_addend - (Elf32_Addr) reloc_addr;
847b055c	459	break;
c612d994	460	case R_390_PC16DBL:
c612d994 UD	461	(unsigned short ) reloc_addr = (unsigned short)
	462	((short) (value + reloc->r_addend - (Elf32_Addr) reloc_addr) >> 1);
	463	break;
caf512de MS	464	case R_390_PC32DBL:
	465	(unsigned int ) reloc_addr = (unsigned int)
	466	((int) (value + reloc->r_addend - (Elf32_Addr) reloc_addr) >> 1);
	467	break;
c612d994 UD	468	case R_390_PC16:
	469	(unsigned short ) reloc_addr =
	470	value + reloc->r_addend - (Elf32_Addr) reloc_addr;
	471	break;
847b055c AJ	472	case R_390_NONE:
847b055c AJ	473	break;
8e27f45e	474	# endif
c612d994 UD	475	#endif
c612d994 UD	476	#if !defined(RTLD_BOOTSTRAP) \|\| defined(_NDEBUG)
847b055c	477	default:
c612d994 UD	478	/* We add these checks in the version to relocate ld.so only
c612d994 UD	479	if we are still debugging. */
1721af3f	480	_dl_reloc_bad_type (map, r_type, 0);
847b055c	481	break;
c612d994	482	#endif
847b055c AJ	483	}
	484	}
	485	}
	486
bb38d32c UD	487	auto inline void
bb38d32c UD	488	__attribute__ ((always_inline))
7c69dc8b	489	elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc,
87d254a7	490	void *const reloc_addr_arg)
1721af3f	491	{
87d254a7	492	Elf32_Addr *const reloc_addr = reloc_addr_arg;
1721af3f UD	493	*reloc_addr = l_addr + reloc->r_addend;
1721af3f UD	494	}
847b055c	495
bb38d32c UD	496	auto inline void
bb38d32c UD	497	__attribute__ ((always_inline))
847b055c	498	elf_machine_lazy_rel (struct link_map *map,
3a62d00d AS	499	Elf32_Addr l_addr, const Elf32_Rela *reloc,
3a62d00d AS	500	int skip_ifunc)
847b055c AJ	501	{
847b055c AJ	502	Elf32_Addr const reloc_addr = (void ) (l_addr + reloc->r_offset);
1721af3f	503	const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
847b055c	504	/* Check for unexpected PLT reloc type. */
a1ffb40e	505	if (__glibc_likely (r_type == R_390_JMP_SLOT))
32e6df36 UD	506	{
	507	if (__builtin_expect (map->l_mach.plt, 0) == 0)
	508	*reloc_addr += l_addr;
	509	else
dd8f8da9	510	reloc_addr = map->l_mach.plt + (reloc - map->l_mach.jmprel) 32;
32e6df36	511	}
a1ffb40e	512	else if (__glibc_likely (r_type == R_390_IRELATIVE))
08f43f9b AK	513	{
08f43f9b AK	514	Elf32_Addr value = map->l_addr + reloc->r_addend;
a1ffb40e	515	if (__glibc_likely (!skip_ifunc))
08f43f9b AK	516	value = elf_ifunc_invoke (value);
	517	*reloc_addr = value;
	518	}
847b055c	519	else
1721af3f	520	_dl_reloc_bad_type (map, r_type, 1);
847b055c AJ	521	}
847b055c AJ	522
bb38d32c	523	#endif /* RESOLVE_MAP */