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authorAlan Modra <amodra@gmail.com>2019-09-23 16:06:22 +0930
committerAlan Modra <amodra@gmail.com>2019-09-23 23:49:25 +0930
commitec73ddcd43b588924c95f1a997351314ddf84e39 (patch)
tree890a18f8399d1e10e473bd99bb1b6cf11d1fb804 /bfd/elf64-ppc.c
parent6831670dd3c0a64e332b316c95873c57ab19887a (diff)
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PowerPC64 dynamic symbol tweaks
In check_relocs, bfd_link_pic true means ld is producing a shared library or a position independent executable. !bfd_link_pic means a fixed position (ie. static) executable since the relocatable linking case is excluded. So it is appropriate to continue using bfd_link_pic when testing whether non-pcrelative relocations should be dynamic, and !bfd_link_pic for the special case of ifunc in static executables. However, -Bsymbolic shouldn't affect PIEs (they are executables so none of their symbols should be overridden) and PIEs can support copy relocations, thus bfd_link_executable should be used in those cases rather than bfd_link_pic. I've also removed the test of ELIMINATE_COPY_RELOCS in check_relocs. We can sort out what to do regarding copy relocs later, which allows the code in check_relocs to be simplified. * elf64-ppc.c (ppc64_elf_check_relocs): Use bfd_link_executable in choosing between different actions for shared library and non-shared library cases. Delete ELIMINATE_COPY_RELOCS test. (dec_dynrel_count): Likewise. Account for ifunc special case. (ppc64_elf_adjust_dynamic_symbol): Copy relocs are for executables, not non-pic. (allocate_dynrelocs): Comment fixes. Delete ELIMINATE_COPY_RELOCS test.
Diffstat (limited to 'bfd/elf64-ppc.c')
-rw-r--r--bfd/elf64-ppc.c67
1 files changed, 34 insertions, 33 deletions
diff --git a/bfd/elf64-ppc.c b/bfd/elf64-ppc.c
index ed80775..d5a46db 100644
--- a/bfd/elf64-ppc.c
+++ b/bfd/elf64-ppc.c
@@ -4836,7 +4836,7 @@ ppc64_elf_check_relocs (bfd *abfd, struct bfd_link_info *info,
case R_PPC64_TOC16_HA:
case R_PPC64_TOC16_LO_DS:
sec->has_toc_reloc = 1;
- if (h != NULL && !bfd_link_pic (info))
+ if (h != NULL && bfd_link_executable (info))
{
/* We may need a copy reloc. */
h->non_got_ref = 1;
@@ -5076,7 +5076,7 @@ ppc64_elf_check_relocs (bfd *abfd, struct bfd_link_info *info,
case R_PPC64_UADDR32:
case R_PPC64_UADDR64:
case R_PPC64_TOC:
- if (h != NULL && !bfd_link_pic (info))
+ if (h != NULL && bfd_link_executable (info))
/* We may need a copy reloc. */
h->non_got_ref = 1;
@@ -5106,17 +5106,14 @@ ppc64_elf_check_relocs (bfd *abfd, struct bfd_link_info *info,
dynamic library if we manage to avoid copy relocs for the
symbol. */
dodyn:
- if ((bfd_link_pic (info)
- && (must_be_dyn_reloc (info, r_type)
- || (h != NULL
- && (!SYMBOLIC_BIND (info, h)
- || h->root.type == bfd_link_hash_defweak
- || !h->def_regular))))
- || (ELIMINATE_COPY_RELOCS
- && !bfd_link_pic (info)
- && h != NULL
- && (h->root.type == bfd_link_hash_defweak
- || !h->def_regular))
+ if ((h != NULL
+ && (h->root.type == bfd_link_hash_defweak
+ || !h->def_regular))
+ || (h != NULL
+ && !bfd_link_executable (info)
+ && !SYMBOLIC_BIND (info, h))
+ || (bfd_link_pic (info)
+ && must_be_dyn_reloc (info, r_type))
|| (!bfd_link_pic (info)
&& ifunc != NULL))
{
@@ -6425,7 +6422,7 @@ ppc64_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
only references to the symbol are via the global offset table.
For such cases we need not do anything here; the relocations will
be handled correctly by relocate_section. */
- if (bfd_link_pic (info))
+ if (!bfd_link_executable (info))
return TRUE;
/* If there are no references to this symbol that do not use the
@@ -6904,17 +6901,18 @@ dec_dynrel_count (bfd_vma r_info,
return FALSE;
}
- if ((bfd_link_pic (info)
- && (must_be_dyn_reloc (info, r_type)
- || (h != NULL
- && (!SYMBOLIC_BIND (info, h)
- || h->root.type == bfd_link_hash_defweak
- || !h->def_regular))))
- || (ELIMINATE_COPY_RELOCS
- && !bfd_link_pic (info)
- && h != NULL
- && (h->root.type == bfd_link_hash_defweak
- || !h->def_regular)))
+ if ((h != NULL
+ && (h->root.type == bfd_link_hash_defweak
+ || !h->def_regular))
+ || (h != NULL
+ && !bfd_link_executable (info)
+ && !SYMBOLIC_BIND (info, h))
+ || (bfd_link_pic (info)
+ && must_be_dyn_reloc (info, r_type))
+ || (!bfd_link_pic (info)
+ && (h != NULL
+ ? h->type == STT_GNU_IFUNC
+ : ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)))
;
else
return TRUE;
@@ -9403,7 +9401,8 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
for (gent = h->got.glist; gent != NULL; gent = gent->next)
if (!gent->is_indirect)
{
- /* Make sure this symbol is output as a dynamic symbol. */
+ /* Ensure we catch all the cases where this symbol should
+ be made dynamic. */
if (!ensure_undef_dynamic (info, h))
return FALSE;
@@ -9438,7 +9437,6 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
be defined in regular objects. For the normal shared case,
discard space for relocs that have become local due to symbol
visibility changes. */
-
if (bfd_link_pic (info))
{
/* Relocs that use pc_count are those that appear on a call
@@ -9463,24 +9461,27 @@ allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
if (eh->dyn_relocs != NULL)
{
- /* Make sure this symbol is output as a dynamic symbol. */
+ /* Ensure we catch all the cases where this symbol
+ should be made dynamic. */
if (!ensure_undef_dynamic (info, h))
return FALSE;
}
}
- else if (ELIMINATE_COPY_RELOCS && h->type != STT_GNU_IFUNC)
+
+ /* For a fixed position executable, discard space for
+ relocs against symbols which are not dynamic. */
+ else if (h->type != STT_GNU_IFUNC)
{
- /* For the non-pic case, discard space for relocs against
- symbols which turn out to need copy relocs or are not
- dynamic. */
if (h->dynamic_adjusted
&& !h->def_regular
&& !ELF_COMMON_DEF_P (h))
{
- /* Make sure this symbol is output as a dynamic symbol. */
+ /* Ensure we catch all the cases where this symbol
+ should be made dynamic. */
if (!ensure_undef_dynamic (info, h))
return FALSE;
+ /* But if that didn't work out, discard dynamic relocs. */
if (h->dynindx == -1)
eh->dyn_relocs = NULL;
}