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* elf32-ppc.c (struct elf_linker_section): Remove sym_hash and
	sym_offset.  Add name, bss_name, sym_name, sym_val.
	(struct ppc_elf_link_hash_table): Remove sdata and sdata2 pointers.
	Add sdata array of elf_linker_section_t.
	(ppc_elf_link_hash_table_create): Set name, sym_name, and bss_name.
	(enum elf_linker_section_enum): Delete.
	(ppc_elf_create_linker_section): Rewrite.  Don't create syms here.
	(ppc_elf_check_relocs): Delay ppc_elf_create_linker_section until
	the special sections are needed.  Adjust htab->sdata refs.
	Ensure dynobj is set in sreloc code.
	(ppc_elf_size_dynamic_sections): Strip sdata sections.
	(ppc_elf_set_sdata_syms): New function.
	(elf_finish_pointer_linker_section): Use 0x8000 for sym_offset.
	(ppc_elf_relocate_section): Adjust references to htab->sdata.  Use
	sym_val instead of sym_hash.
	* elf32-ppc.h (ppc_elf_set_sdata_syms): Declare.
ld/
	* emultempl/ppc32elf.em (gld${EMULATION_NAME}_after_allocation): New
	function.
	(LDEMUL_AFTER_ALLOCATION): Define.
This commit is contained in:
Alan Modra 2005-03-21 13:23:15 +00:00
parent 8853c3d336
commit c9a2f3330b
5 changed files with 148 additions and 155 deletions
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19
bfd/ChangeLog
View file

@ -1,3 +1,22 @@
2005-03-21 Alan Modra <amodra@bigpond.net.au>
* elf32-ppc.c (struct elf_linker_section): Remove sym_hash and
sym_offset. Add name, bss_name, sym_name, sym_val.
(struct ppc_elf_link_hash_table): Remove sdata and sdata2 pointers.
Add sdata array of elf_linker_section_t.
(ppc_elf_link_hash_table_create): Set name, sym_name, and bss_name.
(enum elf_linker_section_enum): Delete.
(ppc_elf_create_linker_section): Rewrite. Don't create syms here.
(ppc_elf_check_relocs): Delay ppc_elf_create_linker_section until
the special sections are needed. Adjust htab->sdata refs.
Ensure dynobj is set in sreloc code.
(ppc_elf_size_dynamic_sections): Strip sdata sections.
(ppc_elf_set_sdata_syms): New function.
(elf_finish_pointer_linker_section): Use 0x8000 for sym_offset.
(ppc_elf_relocate_section): Adjust references to htab->sdata. Use
sym_val instead of sym_hash.
* elf32-ppc.h (ppc_elf_set_sdata_syms): Declare.
2005-03-21 Alan Modra <amodra@bigpond.net.au>
* elf32-ppc.c (is_ppc_elf_target): Move to linker part of file.

251
bfd/elf32-ppc.c
View file

@ -1506,12 +1506,16 @@ ppc_elf_unhandled_reloc (bfd *abfd,
typedef struct elf_linker_section
{
/* pointer to the section */
/* Pointer to the bfd section. */
asection *section;
/* pointer to the created symbol hash value */
struct elf_link_hash_entry *sym_hash;
/* offset of symbol from beginning of section */
bfd_vma sym_offset;
/* Section name. */
const char *name;
/* Associated bss section name. */
const char *bss_name;
/* Associated symbol name. */
const char *sym_name;
/* Value of symbol. */
bfd_vma sym_val;
} elf_linker_section_t;
/* Linked list of allocated pointer entries. This hangs off of the
@ -2117,8 +2121,7 @@ struct ppc_elf_link_hash_table
asection *relbss;
asection *dynsbss;
asection *relsbss;
elf_linker_section_t *sdata;
elf_linker_section_t *sdata2;
elf_linker_section_t sdata[2];
asection *sbss;
/* Shortcut to .__tls_get_addr. */
@ -2186,6 +2189,14 @@ ppc_elf_link_hash_table_create (bfd *abfd)
return NULL;
}
ret->sdata[0].name = ".sdata";
ret->sdata[0].sym_name = "_SDA_BASE_";
ret->sdata[0].bss_name = ".sbss";
ret->sdata[1].name = ".sdata2";
ret->sdata[1].sym_name = "_SDA2_BASE_";
ret->sdata[1].bss_name = ".sbss2";
return &ret->elf.root;
}
@ -2385,121 +2396,47 @@ ppc_elf_add_symbol_hook (bfd *abfd,
return TRUE;
}
/* Enumeration to specify the special section. */
enum elf_linker_section_enum
{
LINKER_SECTION_SDATA,
LINKER_SECTION_SDATA2
};
/* Create a special linker section. */
/* Create a special linker section */
static elf_linker_section_t *
static bfd_boolean
ppc_elf_create_linker_section (bfd *abfd,
struct bfd_link_info *info,
enum elf_linker_section_enum which)
flagword flags,
elf_linker_section_t *lsect)
{
elf_linker_section_t *lsect;
struct ppc_elf_link_hash_table *htab = ppc_elf_hash_table (info);
asection *s, *sym_sec;
bfd_size_type amt;
flagword flags;
const char *name;
const char *rel_name;
const char *sym_name;
bfd_vma sym_offset;
asection *s;
/* The linker creates these sections so it has somewhere to attach
their respective symbols. Startup code (crt1.o) uses these symbols
to initialize a register pointing to the section. If the output
sections corresponding to these input sections were empty it would
be OK to set the symbol to 0 (or any random number), because the
associated register should never be used.
FIXME: Setting a symbol this way is silly. The symbols ought to
be set the same way other backends set gp. */
flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
| SEC_LINKER_CREATED);
sym_offset = 32768;
switch (which)
{
default:
abort ();
return NULL;
case LINKER_SECTION_SDATA: /* .sdata/.sbss section */
name = ".sdata";
rel_name = ".rela.sdata";
sym_name = "_SDA_BASE_";
break;
case LINKER_SECTION_SDATA2: /* .sdata2/.sbss2 section */
name = ".sdata2";
rel_name = ".rela.sdata2";
sym_name = "_SDA2_BASE_";
flags |= SEC_READONLY;
break;
}
flags |= (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY
| SEC_LINKER_CREATED);
/* Record the first bfd that needs the special sections. */
if (!htab->elf.dynobj)
htab->elf.dynobj = abfd;
amt = sizeof (elf_linker_section_t);
lsect = bfd_zalloc (htab->elf.dynobj, amt);
lsect->sym_offset = sym_offset;
/* See if the sections already exist. */
sym_sec = s = bfd_get_section_by_name (htab->elf.dynobj, name);
/* See if the section already exists. */
s = bfd_get_section_by_name (htab->elf.dynobj, lsect->name);
if (s == NULL || (s->flags & flags) != flags)
{
s = bfd_make_section_anyway (htab->elf.dynobj, name);
s = bfd_make_section_anyway (htab->elf.dynobj, lsect->name);
if (s == NULL
|| !bfd_set_section_flags (htab->elf.dynobj, s, flags))
return NULL;
if (sym_sec == NULL)
sym_sec = s;
return FALSE;
}
lsect->section = s;
if (bfd_get_section_alignment (htab->elf.dynobj, s) < 2
&& !bfd_set_section_alignment (htab->elf.dynobj, s, 2))
return NULL;
return FALSE;
s->size = align_power (s->size, 2);
#ifdef DEBUG
fprintf (stderr, "Creating section %s, current size = %ld\n",
name, (long) s->size);
lsect->name, (long) s->size);
#endif
if (sym_name)
{
struct elf_link_hash_entry *h;
struct bfd_link_hash_entry *bh;
#ifdef DEBUG
fprintf (stderr, "Adding %s to section %s\n", sym_name, name);
#endif
bh = bfd_link_hash_lookup (info->hash, sym_name,
FALSE, FALSE, FALSE);
if ((bh == NULL || bh->type == bfd_link_hash_undefined)
&& !(_bfd_generic_link_add_one_symbol
(info, abfd, sym_name, BSF_GLOBAL, sym_sec, sym_offset, NULL,
FALSE, get_elf_backend_data (abfd)->collect, &bh)))
return NULL;
h = (struct elf_link_hash_entry *) bh;
h->type = STT_OBJECT;
lsect->sym_hash = h;
if (info->shared
&& ! bfd_elf_link_record_dynamic_symbol (info, h))
return NULL;
}
return lsect;
return TRUE;
}
/* Find a linker generated pointer with a given addend and type. */
@ -2675,25 +2612,7 @@ ppc_elf_check_relocs (bfd *abfd,
if (!ppc_elf_howto_table[R_PPC_ADDR32])
ppc_elf_howto_init ();
/* Create the linker generated sections all the time so that the
special symbols are created. */
htab = ppc_elf_hash_table (info);
if (htab->sdata == NULL)
{
htab->sdata = ppc_elf_create_linker_section (abfd, info,
LINKER_SECTION_SDATA);
if (htab->sdata == NULL)
return FALSE;
}
if (htab->sdata2 == NULL)
{
htab->sdata2 = ppc_elf_create_linker_section (abfd, info,
LINKER_SECTION_SDATA2);
if (htab->sdata2 == NULL)
return FALSE;
}
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
sym_hashes = elf_sym_hashes (abfd);
sreloc = NULL;
@ -2793,8 +2712,12 @@ ppc_elf_check_relocs (bfd *abfd,
bad_shared_reloc (abfd, r_type);
return FALSE;
}
if (htab->sdata[0].section == NULL
&& !ppc_elf_create_linker_section (abfd, info, 0,
&htab->sdata[0]))
return FALSE;
if (!elf_create_pointer_linker_section (abfd, info,
htab->sdata, h, rel))
&htab->sdata[0], h, rel))
return FALSE;
break;
@ -2805,8 +2728,12 @@ ppc_elf_check_relocs (bfd *abfd,
bad_shared_reloc (abfd, r_type);
return FALSE;
}
if (htab->sdata[1].section == NULL
&& !ppc_elf_create_linker_section (abfd, info, SEC_READONLY,
&htab->sdata[1]))
return FALSE;
if (!elf_create_pointer_linker_section (abfd, info,
htab->sdata2, h, rel))
&htab->sdata[1], h, rel))
return FALSE;
break;
@ -3027,6 +2954,8 @@ ppc_elf_check_relocs (bfd *abfd,
&& strcmp (bfd_get_section_name (abfd, sec),
name + 5) == 0);
if (htab->elf.dynobj == NULL)
htab->elf.dynobj = abfd;
sreloc = bfd_get_section_by_name (htab->elf.dynobj, name);
if (sreloc == NULL)
{
@ -4129,14 +4058,10 @@ ppc_elf_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
/* Strip this section if we don't need it; see the
comment below. */
}
else if ((htab->sdata != NULL && s == htab->sdata->section)
|| (htab->sdata2 != NULL && s == htab->sdata2->section))
else if (s == htab->sdata[0].section
|| s == htab->sdata[1].section)
{
if (s->size == 0)
/* Don't strip these sections. We need them because they
define _SDA_BASE_ and _SDA2_BASE_. crt1.o makes a
reference to _SDA_BASE_ to set up r13. */
continue;
/* Strip these too. */
}
else if (strncmp (bfd_get_section_name (dynobj, s), ".rela", 5) == 0)
{
@ -4638,6 +4563,51 @@ ppc_elf_relax_section (bfd *abfd,
return FALSE;
}
/* Set _SDA_BASE_ and _SDA2_BASE. */
bfd_boolean
ppc_elf_set_sdata_syms (bfd *obfd, struct bfd_link_info *info)
{
struct ppc_elf_link_hash_table *htab;
unsigned i;
htab = ppc_elf_hash_table (info);
for (i = 0; i < 2; i++)
{
elf_linker_section_t *lsect = &htab->sdata[i];
asection *s;
bfd_vma val;
struct elf_link_hash_entry *h;
s = lsect->section;
if (s != NULL)
s = s->output_section;
if (s == NULL)
s = bfd_get_section_by_name (obfd, lsect->name);
if (s == NULL)
s = bfd_get_section_by_name (obfd, lsect->bss_name);
val = 0;
if (s != NULL)
val = s->vma + 32768;
lsect->sym_val = val;
h = elf_link_hash_lookup (&htab->elf, lsect->sym_name,
FALSE, FALSE, FALSE);
if (h != NULL && h->root.type == bfd_link_hash_undefined)
{
h->root.type = bfd_link_hash_defined;
h->root.u.def.section = bfd_abs_section_ptr;
h->root.u.def.value = val;
h->def_regular = 1;
h->type = STT_OBJECT;
h->other = STV_HIDDEN;
}
}
return TRUE;
}
#define bfd_put_ptr(BFD, VAL, ADDR) bfd_put_32 (BFD, VAL, ADDR)
/* Fill in the address for a pointer generated in a linker section. */
@ -4715,7 +4685,7 @@ elf_finish_pointer_linker_section (bfd *output_bfd,
relocation = (lsect->section->output_offset
+ linker_section_ptr->offset
- lsect->sym_offset);
- 0x8000);
#ifdef DEBUG
fprintf (stderr,
@ -5598,20 +5568,20 @@ ppc_elf_relocate_section (bfd *output_bfd,
/* Indirect .sdata relocation. */
case R_PPC_EMB_SDAI16:
BFD_ASSERT (htab->sdata != NULL);
BFD_ASSERT (htab->sdata[0].section != NULL);
relocation
= elf_finish_pointer_linker_section (output_bfd, input_bfd, info,
htab->sdata, h, relocation,
rel);
&htab->sdata[0], h,
relocation, rel);
break;
/* Indirect .sdata2 relocation. */
case R_PPC_EMB_SDA2I16:
BFD_ASSERT (htab->sdata2 != NULL);
BFD_ASSERT (htab->sdata[1].section != NULL);
relocation
= elf_finish_pointer_linker_section (output_bfd, input_bfd, info,
htab->sdata2, h, relocation,
rel);
&htab->sdata[1], h,
relocation, rel);
break;
/* Handle the TOC16 reloc. We want to use the offset within the .got
@ -5651,7 +5621,6 @@ ppc_elf_relocate_section (bfd *output_bfd,
case R_PPC_SDAREL16:
{
const char *name;
const struct elf_link_hash_entry *sh;
BFD_ASSERT (sec != NULL);
name = bfd_get_section_name (abfd, sec->output_section);
@ -5668,10 +5637,7 @@ ppc_elf_relocate_section (bfd *output_bfd,
howto->name,
name);
}
sh = htab->sdata->sym_hash;
addend -= (sh->root.u.def.value
+ sh->root.u.def.section->output_section->vma
+ sh->root.u.def.section->output_offset);
addend -= htab->sdata[0].sym_val;
}
break;
@ -5679,7 +5645,6 @@ ppc_elf_relocate_section (bfd *output_bfd,
case R_PPC_EMB_SDA2REL:
{
const char *name;
const struct elf_link_hash_entry *sh;
BFD_ASSERT (sec != NULL);
name = bfd_get_section_name (abfd, sec->output_section);
@ -5698,10 +5663,7 @@ ppc_elf_relocate_section (bfd *output_bfd,
ret = FALSE;
continue;
}
sh = htab->sdata2->sym_hash;
addend -= (sh->root.u.def.value
+ sh->root.u.def.section->output_section->vma
+ sh->root.u.def.section->output_offset);
addend -= htab->sdata[1].sym_val;
}
break;
@ -5710,7 +5672,6 @@ ppc_elf_relocate_section (bfd *output_bfd,
case R_PPC_EMB_RELSDA:
{
const char *name;
const struct elf_link_hash_entry *sh;
int reg;
BFD_ASSERT (sec != NULL);
@ -5721,20 +5682,14 @@ ppc_elf_relocate_section (bfd *output_bfd,
&& (name[5] == 0 || name[5] == '.'))))
{
reg = 13;
sh = htab->sdata->sym_hash;
addend -= (sh->root.u.def.value
+ sh->root.u.def.section->output_section->vma
+ sh->root.u.def.section->output_offset);
addend -= htab->sdata[0].sym_val;
}
else if (strncmp (name, ".sdata2", 7) == 0
|| strncmp (name, ".sbss2", 6) == 0)
{
reg = 2;
sh = htab->sdata2->sym_hash;
addend -= (sh->root.u.def.value
+ sh->root.u.def.section->output_section->vma
+ sh->root.u.def.section->output_offset);
addend -= htab->sdata[1].sym_val;
}
else if (strcmp (name, ".PPC.EMB.sdata0") == 0

3
bfd/elf32-ppc.h
View file

@ -1,5 +1,5 @@
/* PowerPC-specific support for 64-bit ELF.
Copyright 2003 Free Software Foundation, Inc.
Copyright 2003, 2005 Free Software Foundation, Inc.
This file is part of BFD, the Binary File Descriptor library.
@ -19,3 +19,4 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
asection *ppc_elf_tls_setup (bfd *, struct bfd_link_info *);
bfd_boolean ppc_elf_tls_optimize (bfd *, struct bfd_link_info *);
bfd_boolean ppc_elf_set_sdata_syms (bfd *, struct bfd_link_info *);

6
ld/ChangeLog
View file

@ -1,3 +1,9 @@
2005-03-21 Alan Modra <amodra@bigpond.net.au>
* emultempl/ppc32elf.em (gld${EMULATION_NAME}_after_allocation): New
function.
(LDEMUL_AFTER_ALLOCATION): Define.
2005-03-21 Alan Modra <amodra@bigpond.net.au>
* emultempl/ppc64elf.em (ppc_finish): Rename from

24
ld/emultempl/ppc32elf.em
View file

@ -1,5 +1,5 @@
# This shell script emits a C file. -*- C -*-
# Copyright 2003 Free Software Foundation, Inc.
# Copyright 2003, 2005 Free Software Foundation, Inc.
#
# This file is part of GLD, the Gnu Linker.
#
@ -18,7 +18,7 @@
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
# This file is sourced from elf32.em, and defines extra powerpc64-elf
# This file is sourced from elf32.em, and defines extra powerpc32-elf
# specific routines.
#
cat >>e${EMULATION_NAME}.c <<EOF
@ -26,15 +26,15 @@ cat >>e${EMULATION_NAME}.c <<EOF
#include "libbfd.h"
#include "elf32-ppc.h"
extern const bfd_target bfd_elf32_powerpc_vec;
extern const bfd_target bfd_elf32_powerpcle_vec;
/* Whether to run tls optimization. */
static int notlsopt = 0;
static void
ppc_before_allocation (void)
{
extern const bfd_target bfd_elf32_powerpc_vec;
extern const bfd_target bfd_elf32_powerpcle_vec;
if (link_info.hash->creator == &bfd_elf32_powerpc_vec
|| link_info.hash->creator == &bfd_elf32_powerpcle_vec)
{
@ -50,6 +50,17 @@ ppc_before_allocation (void)
gld${EMULATION_NAME}_before_allocation ();
}
static void
gld${EMULATION_NAME}_after_allocation (void)
{
if (link_info.hash->creator == &bfd_elf32_powerpc_vec
|| link_info.hash->creator == &bfd_elf32_powerpcle_vec)
{
if (!ppc_elf_set_sdata_syms (output_bfd, &link_info))
einfo ("%X%P: cannot set sdata syms %E\n");
}
}
EOF
# Define some shell vars to insert bits of code into the standard elf
@ -75,6 +86,7 @@ PARSE_AND_LIST_ARGS_CASES='
break;
'
# Put these extra ppc64elf routines in ld_${EMULATION_NAME}_emulation
# Put these extra ppc32elf routines in ld_${EMULATION_NAME}_emulation
#
LDEMUL_BEFORE_ALLOCATION=ppc_before_allocation
LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation