/* IBM S/390-specific support for 64-bit ELF
- Copyright (C) 2000-2016 Free Software Foundation, Inc.
+ Copyright (C) 2000-2017 Free Software Foundation, Inc.
Contributed Martin Schwidefsky (schwidefsky@de.ibm.com).
This file is part of BFD, the Binary File Descriptor library.
#include "libbfd.h"
#include "elf-bfd.h"
#include "elf/s390.h"
+#include "elf-s390.h"
+#include <stdarg.h>
/* In case we're on a 32-bit machine, construct a 64-bit "-1" value
from smaller values. Start with zero, widen, *then* decrement. */
default:
if (r_type >= sizeof (elf_howto_table) / sizeof (elf_howto_table[0]))
{
- (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
- abfd, (int) r_type);
+ /* xgettext:c-format */
+ _bfd_error_handler (_("%B: invalid relocation type %d"),
+ abfd, (int) r_type);
r_type = R_390_NONE;
}
cache_ptr->howto = &elf_howto_table[r_type];
The GOT holds the address in the PLT to be executed.
The loader then gets:
- 24(15) = Pointer to the structure describing the object.
- 28(15) = Offset in symbol table
+ 48(15) = Pointer to the structure describing the object.
+ 56(15) = Offset in symbol table
The loader must then find the module where the function is
and insert the address in the GOT.
struct elf_link_hash_table elf;
/* Short-cuts to get to dynamic linker sections. */
- asection *sdynbss;
- asection *srelbss;
asection *irelifunc;
union {
/* Small local sym cache. */
struct sym_cache sym_cache;
+
+ /* Options passed from the linker. */
+ struct s390_elf_params *params;
};
/* Get the s390 ELF linker hash table from a link_info structure. */
-#define elf_s390_hash_table(p) \
- (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
- == S390_ELF_DATA ? ((struct elf_s390_link_hash_table *) ((p)->hash)) : NULL)
+#define elf_s390_hash_table(p) \
+ (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
+ == S390_ELF_DATA ? ((struct elf_s390_link_hash_table *) ((p)->hash)) : NULL)
#define ELF64 1
#include "elf-s390-common.c"
return &ret->elf.root;
}
-/* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
- shortcuts to them in our hash table. */
-
-static bfd_boolean
-create_got_section (bfd *dynobj,
- struct bfd_link_info *info)
-{
- struct elf_s390_link_hash_table *htab;
-
- if (! _bfd_elf_create_got_section (dynobj, info))
- return FALSE;
-
- htab = elf_s390_hash_table (info);
- if (htab == NULL)
- return FALSE;
-
- htab->elf.sgot = bfd_get_linker_section (dynobj, ".got");
- htab->elf.sgotplt = bfd_get_linker_section (dynobj, ".got.plt");
- htab->elf.srelgot = bfd_get_linker_section (dynobj, ".rela.got");
- if (!htab->elf.sgot || !htab->elf.sgotplt || !htab->elf.srelgot)
- abort ();
- return TRUE;
-}
-
-/* Create .plt, .rela.plt, .got, .got.plt, .rela.got, .dynbss, and
- .rela.bss sections in DYNOBJ, and set up shortcuts to them in our
- hash table. */
-
-static bfd_boolean
-elf_s390_create_dynamic_sections (bfd *dynobj,
- struct bfd_link_info *info)
-{
- struct elf_s390_link_hash_table *htab;
-
- htab = elf_s390_hash_table (info);
- if (htab == NULL)
- return FALSE;
-
- if (!htab->elf.sgot && !create_got_section (dynobj, info))
- return FALSE;
-
- if (!_bfd_elf_create_dynamic_sections (dynobj, info))
- return FALSE;
-
- htab->elf.splt = bfd_get_linker_section (dynobj, ".plt");
- htab->elf.srelplt = bfd_get_linker_section (dynobj, ".rela.plt");
- htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
- if (!bfd_link_pic (info))
- htab->srelbss = bfd_get_linker_section (dynobj, ".rela.bss");
-
- if (!htab->elf.splt || !htab->elf.srelplt || !htab->sdynbss
- || (!bfd_link_pic (info) && !htab->srelbss))
- abort ();
-
- return TRUE;
-}
-
/* Copy the extra info we tack onto an elf_link_hash_entry. */
static void
/* If called to transfer flags for a weakdef during processing
of elf_adjust_dynamic_symbol, don't copy non_got_ref.
We clear it ourselves for ELIMINATE_COPY_RELOCS. */
- dir->ref_dynamic |= ind->ref_dynamic;
+ if (dir->versioned != versioned_hidden)
+ dir->ref_dynamic |= ind->ref_dynamic;
dir->ref_regular |= ind->ref_regular;
dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
dir->needs_plt |= ind->needs_plt;
if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
{
- (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
- abfd,
- r_symndx);
+ /* xgettext:c-format */
+ _bfd_error_handler (_("%B: bad symbol index: %d"),
+ abfd, r_symndx);
return FALSE;
}
/* PR15323, ref flags aren't set for references in the same
object. */
- h->root.non_ir_ref = 1;
+ h->root.non_ir_ref_regular = 1;
}
/* Create got section and local_got_refcounts array if they
{
if (htab->elf.dynobj == NULL)
htab->elf.dynobj = abfd;
- if (!create_got_section (htab->elf.dynobj, info))
+ if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
return FALSE;
}
}
case R_390_GOTOFF64:
if (h == NULL || !s390_is_ifunc_symbol_p (h) || !h->def_regular)
break;
+ /* Fall through. */
case R_390_PLT12DBL:
case R_390_PLT16DBL:
{
if (old_tls_type == GOT_NORMAL || tls_type == GOT_NORMAL)
{
- (*_bfd_error_handler)
+ _bfd_error_handler
+ /* xgettext:c-format */
(_("%B: `%s' accessed both as normal and thread local symbol"),
abfd, h->root.root.string);
return FALSE;
struct elf_link_hash_entry *h)
{
struct elf_s390_link_hash_table *htab;
- asection *s;
+ asection *s, *srel;
/* STT_GNU_IFUNC symbol must go through PLT. */
if (s390_is_ifunc_symbol_p (h))
/* We must generate a R_390_COPY reloc to tell the dynamic linker to
copy the initial value out of the dynamic object and into the
runtime process image. */
+ if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
+ {
+ s = htab->elf.sdynrelro;
+ srel = htab->elf.sreldynrelro;
+ }
+ else
+ {
+ s = htab->elf.sdynbss;
+ srel = htab->elf.srelbss;
+ }
if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
{
- htab->srelbss->size += sizeof (Elf64_External_Rela);
+ srel->size += sizeof (Elf64_External_Rela);
h->needs_copy = 1;
}
- s = htab->sdynbss;
-
return _bfd_elf_adjust_dynamic_copy (info, h, s);
}
if (s == htab->elf.splt
|| s == htab->elf.sgot
|| s == htab->elf.sgotplt
- || s == htab->sdynbss
+ || s == htab->elf.sdynbss
+ || s == htab->elf.sdynrelro
|| s == htab->elf.iplt
|| s == htab->elf.igotplt
|| s == htab->irelifunc)
reloc_howto_type *howto;
howto = elf_howto_table + ELF64_R_TYPE (rel->r_info);
- (*_bfd_error_handler)
+ _bfd_error_handler
+ /* xgettext:c-format */
(_("%B(%A+0x%lx): invalid instruction for TLS relocation %s"),
input_bfd,
input_section,
PLT_ENTRY_SIZE;
/* Offset in GOT is PLT index plus GOT headers(3)
- times 4, addr & GOT addr. */
+ times 8, addr & GOT addr. */
relocation = (plt_index + 3) * GOT_ENTRY_SIZE;
if (r_type == R_390_GOTPLTENT)
relocation += htab->elf.sgot->output_section->vma;
case R_390_PC32:
case R_390_PC32DBL:
case R_390_PC64:
+ if (h != NULL
+ && bfd_link_pie (info)
+ && !h->def_regular)
+ {
+ _bfd_error_handler (_("%B: `%s' non-PLT reloc for symbol defined "
+ "in shared library and accessed "
+ "from executable "
+ "(rebuild file with -fPIC ?)"),
+ input_bfd, h->root.root.string);
+ bfd_set_error (bfd_error_bad_value);
+ return FALSE;
+ }
/* The target of these relocs are instruction operands
residing in read-only sections. We cannot emit a runtime
reloc for it. */
+ h->plt.offset);
goto do_relocation;
}
+ /* Fall through. */
case R_390_8:
case R_390_16:
&& s390_is_ifunc_symbol_p (h)
&& h->def_regular)
{
- if (!bfd_link_pic (info) || !h->non_got_ref)
+ if (!bfd_link_pic (info))
{
- /* For a non-shared object STT_GNU_IFUNC symbol must
- go through PLT. */
+ /* For a non-shared object the symbol will not
+ change. Hence we can write the address of the
+ target IPLT slot now. */
relocation = (htab->elf.iplt->output_section->vma
+ htab->elf.iplt->output_offset
+ h ->plt.offset);
insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
if (insn1 != 0x0004)
- invalid_tls_insn (input_bfd, input_section, rel);
- ry = 0;
+ {
+ invalid_tls_insn (input_bfd, input_section, rel);
+ return FALSE;
+ }
if ((insn0 & 0xff00f000) == 0xe3000000)
/* lg %rx,0(%ry,0) -> sllg %rx,%ry,0 */
ry = (insn0 & 0x000f0000);
/* lg %rx,0(%r12,%ry) -> sllg %rx,%ry,0 */
ry = (insn0 & 0x0000f000) << 4;
else
- invalid_tls_insn (input_bfd, input_section, rel);
+ {
+ invalid_tls_insn (input_bfd, input_section, rel);
+ return FALSE;
+ }
insn0 = 0xeb000000 | (insn0 & 0x00f00000) | ry;
insn1 = 0x000d;
bfd_put_32 (output_bfd, insn0, contents + rel->r_offset);
insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
if ((insn0 & 0xffff0000) != 0xc0e50000)
- invalid_tls_insn (input_bfd, input_section, rel);
+ {
+ invalid_tls_insn (input_bfd, input_section, rel);
+ return FALSE;
+ }
if (!bfd_link_pic (info) && (h == NULL || h->dynindx == -1))
{
/* GD->LE transition.
insn0 = bfd_get_32 (input_bfd, contents + rel->r_offset);
insn1 = bfd_get_16 (input_bfd, contents + rel->r_offset + 4);
if ((insn0 & 0xffff0000) != 0xc0e50000)
- invalid_tls_insn (input_bfd, input_section, rel);
+ {
+ invalid_tls_insn (input_bfd, input_section, rel);
+ return FALSE;
+ }
/* LD->LE transition.
brasl %r14,__tls_get_addr@plt -> brcl 0,. */
insn0 = 0xc0040000;
&& h->def_dynamic)
&& _bfd_elf_section_offset (output_bfd, info, input_section,
rel->r_offset) != (bfd_vma) -1)
- (*_bfd_error_handler)
+ _bfd_error_handler
+ /* xgettext:c-format */
(_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
input_bfd,
input_section,
}
if (r == bfd_reloc_overflow)
- {
-
- if (! ((*info->callbacks->reloc_overflow)
- (info, (h ? &h->root : NULL), name, howto->name,
- (bfd_vma) 0, input_bfd, input_section,
- rel->r_offset)))
- return FALSE;
- }
+ (*info->callbacks->reloc_overflow)
+ (info, (h ? &h->root : NULL), name, howto->name,
+ (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
else
{
- (*_bfd_error_handler)
+ _bfd_error_handler
+ /* xgettext:c-format */
(_("%B(%A+0x%lx): reloc against `%s': error %d"),
input_bfd, input_section,
(long) rel->r_offset, name, (int) r);
}
}
else if (bfd_link_pic (info)
- && SYMBOL_REFERENCES_LOCAL (info, h))
+ && SYMBOL_REFERENCES_LOCAL (info, h))
{
/* If this is a static link, or it is a -Bsymbolic link and
the symbol is defined locally or was forced to be local
RELATIVE reloc. The entry in the global offset table
will already have been initialized in the
relocate_section function. */
- if (!h->def_regular)
+ if (!(h->def_regular || ELF_COMMON_DEF_P (h)))
return FALSE;
BFD_ASSERT((h->got.offset & 1) != 0);
rela.r_info = ELF64_R_INFO (0, R_390_RELATIVE);
else
{
BFD_ASSERT((h->got.offset & 1) == 0);
-do_glob_dat:
+ do_glob_dat:
bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgot->contents + h->got.offset);
rela.r_info = ELF64_R_INFO (h->dynindx, R_390_GLOB_DAT);
rela.r_addend = 0;
if (h->needs_copy)
{
Elf_Internal_Rela rela;
+ asection *s;
bfd_byte *loc;
/* This symbols needs a copy reloc. Set it up. */
if (h->dynindx == -1
|| (h->root.type != bfd_link_hash_defined
&& h->root.type != bfd_link_hash_defweak)
- || htab->srelbss == NULL)
+ || htab->elf.srelbss == NULL)
abort ();
rela.r_offset = (h->root.u.def.value
+ h->root.u.def.section->output_offset);
rela.r_info = ELF64_R_INFO (h->dynindx, R_390_COPY);
rela.r_addend = 0;
- loc = htab->srelbss->contents;
- loc += htab->srelbss->reloc_count++ * sizeof (Elf64_External_Rela);
+ if (h->root.u.def.section == htab->elf.sdynrelro)
+ s = htab->elf.sreldynrelro;
+ else
+ s = htab->elf.srelbss;
+ loc = s->contents + s->reloc_count++ * sizeof (Elf64_External_Rela);
bfd_elf64_swap_reloca_out (output_bfd, &rela, loc);
}
break;
case DT_PLTRELSZ:
- s = htab->elf.srelplt;
- dyn.d_un.d_val = s->size;
+ dyn.d_un.d_val = htab->elf.srelplt->size + htab->elf.irelplt->size;
break;
case DT_RELASZ:
linker script arranges for .rela.plt to follow all
other relocation sections, we don't have to worry
about changing the DT_RELA entry. */
- s = htab->elf.srelplt;
- dyn.d_un.d_val -= s->size;
+ dyn.d_un.d_val -= htab->elf.srelplt->size + htab->elf.irelplt->size;
break;
}
PLT_FIRST_ENTRY_SIZE);
/* Fixup relative address to start of GOT */
bfd_put_32 (output_bfd,
- (htab->elf.sgotplt->output_section->vma +
- htab->elf.sgotplt->output_offset
- - htab->elf.splt->output_section->vma - 6)/2,
+ (htab->elf.sgotplt->output_section->vma
+ + htab->elf.sgotplt->output_offset
+ - htab->elf.splt->output_section->vma
+ - htab->elf.splt->output_offset - 6)/2,
htab->elf.splt->contents + 8);
}
if (elf_section_data (htab->elf.splt->output_section) != NULL)
/* One entry for shared object struct ptr. */
bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 8);
/* One entry for _dl_runtime_resolve. */
- bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 12);
+ bfd_put_64 (output_bfd, (bfd_vma) 0, htab->elf.sgotplt->contents + 16);
}
elf_section_data (htab->elf.sgot->output_section)
return TRUE;
}
+\f
+/* Support for core dump NOTE sections. */
+
+static bfd_boolean
+elf_s390_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
+{
+ int offset;
+ size_t size;
+
+ switch (note->descsz)
+ {
+ default:
+ return FALSE;
+
+ case 336: /* sizeof(struct elf_prstatus) on s390x */
+ /* pr_cursig */
+ elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
+
+ /* pr_pid */
+ elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 32);
+
+ /* pr_reg */
+ offset = 112;
+ size = 216;
+ break;
+ }
+
+ /* Make a ".reg/999" section. */
+ return _bfd_elfcore_make_pseudosection (abfd, ".reg",
+ size, note->descpos + offset);
+}
+
+static bfd_boolean
+elf_s390_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
+{
+ switch (note->descsz)
+ {
+ default:
+ return FALSE;
+
+ case 136: /* sizeof(struct elf_prpsinfo) on s390x */
+ elf_tdata (abfd)->core->pid
+ = bfd_get_32 (abfd, note->descdata + 24);
+ elf_tdata (abfd)->core->program
+ = _bfd_elfcore_strndup (abfd, note->descdata + 40, 16);
+ elf_tdata (abfd)->core->command
+ = _bfd_elfcore_strndup (abfd, note->descdata + 56, 80);
+ }
+
+ /* Note that for some reason, a spurious space is tacked
+ onto the end of the args in some (at least one anyway)
+ implementations, so strip it off if it exists. */
+
+ {
+ char *command = elf_tdata (abfd)->core->command;
+ int n = strlen (command);
+
+ if (0 < n && command[n - 1] == ' ')
+ command[n - 1] = '\0';
+ }
+
+ return TRUE;
+}
+
+static char *
+elf_s390_write_core_note (bfd *abfd, char *buf, int *bufsiz,
+ int note_type, ...)
+{
+ va_list ap;
+ switch (note_type)
+ {
+ default:
+ return NULL;
+
+ case NT_PRPSINFO:
+ {
+ char data[136] = { 0 };
+ const char *fname, *psargs;
+
+ va_start (ap, note_type);
+ fname = va_arg (ap, const char *);
+ psargs = va_arg (ap, const char *);
+ va_end (ap);
+
+ strncpy (data + 40, fname, 16);
+ strncpy (data + 56, psargs, 80);
+ return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
+ &data, sizeof (data));
+ }
+
+ case NT_PRSTATUS:
+ {
+ char data[336] = { 0 };
+ long pid;
+ int cursig;
+ const void *gregs;
+
+ va_start (ap, note_type);
+ pid = va_arg (ap, long);
+ cursig = va_arg (ap, int);
+ gregs = va_arg (ap, const void *);
+ va_end (ap);
+
+ bfd_put_16 (abfd, cursig, data + 12);
+ bfd_put_32 (abfd, pid, data + 32);
+ memcpy (data + 112, gregs, 216);
+ return elfcore_write_note (abfd, buf, bufsiz, "CORE", note_type,
+ &data, sizeof (data));
+ }
+ }
+ /* NOTREACHED */
+}
+\f
/* Return address for Ith PLT stub in section PLT, for relocation REL
or (bfd_vma) -1 if it should not be included. */
object file when linking. */
static bfd_boolean
-elf64_s390_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
+elf64_s390_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
{
- if (!is_s390_elf (ibfd) || !is_s390_elf (obfd))
+ if (!is_s390_elf (ibfd) || !is_s390_elf (info->output_bfd))
return TRUE;
- if (!elf_s390_merge_obj_attributes (ibfd, obfd))
+ return elf_s390_merge_obj_attributes (ibfd, info);
+}
+
+/* We may add a PT_S390_PGSTE program header. */
+
+static int
+elf_s390_additional_program_headers (bfd *abfd ATTRIBUTE_UNUSED,
+ struct bfd_link_info *info)
+{
+ struct elf_s390_link_hash_table *htab;
+
+ htab = elf_s390_hash_table (info);
+ return htab->params->pgste;
+}
+
+
+/* Add the PT_S390_PGSTE program header. */
+
+static bfd_boolean
+elf_s390_modify_segment_map (bfd *abfd ATTRIBUTE_UNUSED,
+ struct bfd_link_info *info)
+{
+ struct elf_s390_link_hash_table *htab;
+ struct elf_segment_map *m, *pm = NULL;
+
+ htab = elf_s390_hash_table (info);
+ if (!htab->params->pgste)
+ return TRUE;
+
+ /* If there is already a PT_S390_PGSTE header, avoid adding
+ another. */
+ m = elf_seg_map (abfd);
+ while (m && m->p_type != PT_S390_PGSTE)
+ {
+ pm = m;
+ m = m->next;
+ }
+
+ if (m)
+ return TRUE;
+
+ m = (struct elf_segment_map *)
+ bfd_zalloc (abfd, sizeof (struct elf_segment_map));
+ if (m == NULL)
return FALSE;
+ m->p_type = PT_S390_PGSTE;
+ m->count = 0;
+ m->next = NULL;
+ if (pm)
+ pm->next = m;
return TRUE;
}
+bfd_boolean
+bfd_elf_s390_set_options (struct bfd_link_info *info,
+ struct s390_elf_params *params)
+{
+ struct elf_s390_link_hash_table *htab;
+
+ htab = elf_s390_hash_table (info);
+ htab->params = params;
+
+ return TRUE;
+}
+
+
/* Why was the hash table entry size definition changed from
ARCH_SIZE/8 to 4? This breaks the 64 bit dynamic linker and
this is the only reason for the s390_elf64_size_info structure. */
#define elf_backend_plt_readonly 1
#define elf_backend_want_plt_sym 0
#define elf_backend_got_header_size 24
+#define elf_backend_want_dynrelro 1
#define elf_backend_rela_normal 1
#define elf_info_to_howto elf_s390_info_to_howto
#define elf_backend_adjust_dynamic_symbol elf_s390_adjust_dynamic_symbol
#define elf_backend_check_relocs elf_s390_check_relocs
#define elf_backend_copy_indirect_symbol elf_s390_copy_indirect_symbol
-#define elf_backend_create_dynamic_sections elf_s390_create_dynamic_sections
+#define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
#define elf_backend_finish_dynamic_sections elf_s390_finish_dynamic_sections
#define elf_backend_finish_dynamic_symbol elf_s390_finish_dynamic_symbol
#define elf_backend_gc_mark_hook elf_s390_gc_mark_hook
#define elf_backend_relocate_section elf_s390_relocate_section
#define elf_backend_size_dynamic_sections elf_s390_size_dynamic_sections
#define elf_backend_init_index_section _bfd_elf_init_1_index_section
+#define elf_backend_grok_prstatus elf_s390_grok_prstatus
+#define elf_backend_grok_psinfo elf_s390_grok_psinfo
+#define elf_backend_write_core_note elf_s390_write_core_note
#define elf_backend_plt_sym_val elf_s390_plt_sym_val
#define elf_backend_add_symbol_hook elf_s390_add_symbol_hook
#define elf_backend_sort_relocs_p elf_s390_elf_sort_relocs_p
+#define elf_backend_additional_program_headers elf_s390_additional_program_headers
+#define elf_backend_modify_segment_map elf_s390_modify_segment_map
#define bfd_elf64_mkobject elf_s390_mkobject
#define elf_backend_object_p elf_s390_object_p