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* elf64-ppc.c (ppc64_elf_adjust_dynamic_symbol): Ensure no copy relocs

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on function descriptors.
	(ELIMINATE_COPY_RELOCS): Expand comment.
	(ppc64_elf_special_sections): Move.  Don't include non-ppc64 sections.
	Do include ".toc1".
This commit is contained in:
Alan Modra 2003-07-27 09:05:08 +00:00
parent 6fbedbbcb6
commit 5d35169e36
2 changed files with 46 additions and 37 deletions
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8
bfd/ChangeLog
View File

@ -1,3 +1,11 @@
2003-07-27 Alan Modra <amodra@bigpond.net.au>
* elf64-ppc.c (ppc64_elf_adjust_dynamic_symbol): Ensure no copy relocs
on function descriptors.
(ELIMINATE_COPY_RELOCS): Expand comment.
(ppc64_elf_special_sections): Move. Don't include non-ppc64 sections.
Do include ".toc1".
2003-07-25 H.J. Lu <hongjiu.lu@intel.com>
* elf.c (_bfd_elf_new_section_hook): Set the default section

75
bfd/elf64-ppc.c
View File

@ -2402,6 +2402,26 @@ ppc64_elf_merge_private_bfd_data (bfd *ibfd, bfd *obfd)
return TRUE;
}
/* Add extra PPC sections. */
static struct bfd_elf_special_section const ppc64_elf_special_sections[]=
{
{ ".sdata", 0, NULL, 0,
SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
{ ".sbss", 0, NULL, 0,
SHT_NOBITS, SHF_ALLOC + SHF_WRITE },
{ ".plt", 0, NULL, 0,
SHT_NOBITS, 0 },
{ ".toc", 0, NULL, 0,
SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
{ ".toc1", 0, NULL, 0,
SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
{ ".tocbss", 0, NULL, 0,
SHT_NOBITS, SHF_ALLOC + SHF_WRITE },
{ NULL, 0, NULL, 0,
0, 0 }
};
struct _ppc64_elf_section_data
{
struct bfd_elf_section_data elf;
@ -2580,7 +2600,18 @@ struct plt_entry
/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
copying dynamic variables from a shared lib into an app's dynbss
section, and instead use a dynamic relocation to point into the
shared lib. */
shared lib. With code that gcc generates, it's vital that this be
enabled; In the PowerPC64 ABI, the address of a function is actually
the address of a function descriptor, which resides in the .opd
section. gcc uses the descriptor directly rather than going via the
GOT as some other ABI's do, which means that initialized function
pointers must reference the descriptor. Thus, a function pointer
initialized to the address of a function in a shared library will
either require a copy reloc, or a dynamic reloc. Using a copy reloc
redefines the function desctriptor symbol to point to the copy. This
presents a problem as a plt entry for that function is also
initialized from the function descriptor symbol and the copy reloc
may not be initialized first. */
#define ELIMINATE_COPY_RELOCS 1
/* Section name for stubs is the associated section name plus this
@ -4500,9 +4531,6 @@ ppc64_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
return TRUE;
}
/* This is a reference to a symbol defined by a dynamic object which
is not a function. */
/* If we are creating a shared library, we must presume that the
only references to the symbol are via the global offset table.
For such cases we need not do anything here; the relocations will
@ -4537,6 +4565,12 @@ ppc64_elf_adjust_dynamic_symbol (struct bfd_link_info *info,
}
}
if (h->plt.plist != NULL)
return TRUE;
/* This is a reference to a symbol defined by a dynamic object which
is not a function. */
/* We must allocate the symbol in our .dynbss section, which will
become part of the .bss section of the executable. There will be
an entry for this symbol in the .dynsym section. The dynamic
@ -8762,37 +8796,4 @@ ppc64_elf_finish_dynamic_sections (bfd *output_bfd,
return TRUE;
}
/* Add extra PPC sections -- Note, for now, make .sbss2 and
.PPC.EMB.sbss0 a normal section, and not a bss section so
that the linker doesn't crater when trying to make more than
2 sections. */
static struct bfd_elf_special_section const ppc64_elf_special_sections[]=
{
{ ".tags", 0, NULL, 0,
SHT_ORDERED, SHF_ALLOC },
{ ".sdata", 0, NULL, 0,
SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
{ ".sbss", 0, NULL, 0,
SHT_NOBITS, SHF_ALLOC + SHF_WRITE },
{ ".sdata2", 0, NULL, 0,
SHT_PROGBITS, SHF_ALLOC },
{ ".sbss2", 0, NULL, 0,
SHT_PROGBITS, SHF_ALLOC },
{ ".PPC.EMB.apuinfo", 0, NULL, 0,
SHT_NOTE, 0 },
{ ".PPC.EMB.sdata0", 0, NULL, 0,
SHT_PROGBITS, SHF_ALLOC },
{ ".PPC.EMB.sbss0", 0, NULL, 0,
SHT_PROGBITS, SHF_ALLOC },
{ ".plt", 0, NULL, 0,
SHT_NOBITS, 0 },
{ ".toc", 0, NULL, 0,
SHT_PROGBITS, SHF_ALLOC + SHF_WRITE },
{ ".tocbss", 0, NULL, 0,
SHT_NOBITS, SHF_ALLOC + SHF_WRITE },
{ NULL, 0, NULL, 0,
0, 0 }
};
#include "elf64-target.h"