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| author | H.J. Lu <hjl.tools@gmail.com> | 2015-09-01 05:06:16 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2015-09-01 05:06:33 -0700 |
| commit | 04ebc307f9601168c165fb63aa39a676e45454b7 (patch) | |
| tree | 3db90b1dba71a706df7edb2f28a6e2104587ebdd /bfd/ChangeLog | |
| parent | b07bca4ecd27f9cbaff822e4135abaf0ae6cd0db (diff) | |
| download | gdb-04ebc307f9601168c165fb63aa39a676e45454b7.zip gdb-04ebc307f9601168c165fb63aa39a676e45454b7.tar.gz gdb-04ebc307f9601168c165fb63aa39a676e45454b7.tar.bz2 | |
Skip PLT for function pointer initialization
We use its PLT entry to initialize function pointer at run-time. If
there is no other usage for the PLT entry, we can generate run-time
function pointer relocations in read-write section, which can be
resolved by dynamic linker, to initialize function pointers. It avoids
the extra indirect branch overhead in PLT.
bfd/
PR ld/18900
* elf32-i386.c (elf_i386_link_hash_entry): Add
func_pointer_refcount.
(elf_i386_link_hash_newfunc): Clear func_pointer_refcount.
(elf_i386_get_local_sym_hash): Likewise.
(elf_i386_copy_indirect_symbol): Also copy
func_pointer_refcount.
(elf_i386_check_relocs): Increment func_pointer_refcount.
(elf_i386_gc_sweep_hook): Decrement func_pointer_refcount.
(elf_i386_allocate_dynrelocs): Don't create the PLT entry if
there are only function pointer relocations which can be
resolved at run-time. Keep dynanamic relocations for run-time
function pointer initialization.
(elf_i386_relocate_section): Copy dynamic function pointer
relocations.
* elf64-x86-64.c (elf_x86_64_link_hash_entry): Add
func_pointer_refcount.
(elf_x86_64_link_hash_newfunc): Clear func_pointer_refcount.
(elf_x86_64_get_local_sym_hash): Likewise.
(elf_x86_64_copy_indirect_symbol): Also copy
func_pointer_refcount.
(elf_x86_64_check_relocs): Increment func_pointer_refcount.
(elf_x86_64_gc_sweep_hook): Decrement func_pointer_refcount.
(elf_x86_64_allocate_dynrelocs): Don't create the PLT entry if
there are only function pointer relocations which can be
resolved at run-time. Keep dynanamic relocations for run-time
function pointer initialization.
(elf_x86_64_relocate_section): Copy dynamic function pointer
relocations.
ld/testsuite/
PR ld/18900
* ld-i386/i386.exp: Run tests for PR ld/18900.
* ld-x86-64/x86-64.exp: Likewise.
* ld-i386/pr18900.out: New file.
* ld-i386/pr18900a.c: Likewise.
* ld-i386/pr18900a.c: Likewise.
* ld-i386/pr18900a.rd: Likewise.
* ld-i386/pr18900b.c: Likewise.
* ld-i386/pr18900b.rd: Likewise.
* ld-i386/pr18900c.c: Likewise.
* ld-x86-64/pr18900.out: Likewise.
* ld-x86-64/pr18900a.c: Likewise.
* ld-x86-64/pr18900a.rd: Likewise.
* ld-x86-64/pr18900b.c: Likewise.
* ld-x86-64/pr18900b.rd: Likewise.
* ld-x86-64/pr18900c.c: Likewise.
* ld-x86-64/mpx3.dd: Updated.
Diffstat (limited to 'bfd/ChangeLog')
| -rw-r--r-- | bfd/ChangeLog | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/bfd/ChangeLog b/bfd/ChangeLog index b3ee41b..b614e3c 100644 --- a/bfd/ChangeLog +++ b/bfd/ChangeLog @@ -1,3 +1,35 @@ +2015-09-01 H.J. Lu <hongjiu.lu@intel.com> + + PR ld/18900 + * elf32-i386.c (elf_i386_link_hash_entry): Add + func_pointer_refcount. + (elf_i386_link_hash_newfunc): Clear func_pointer_refcount. + (elf_i386_get_local_sym_hash): Likewise. + (elf_i386_copy_indirect_symbol): Also copy + func_pointer_refcount. + (elf_i386_check_relocs): Increment func_pointer_refcount. + (elf_i386_gc_sweep_hook): Decrement func_pointer_refcount. + (elf_i386_allocate_dynrelocs): Don't create the PLT entry if + there are only function pointer relocations which can be + resolved at run-time. Keep dynanamic relocations for run-time + function pointer initialization. + (elf_i386_relocate_section): Copy dynamic function pointer + relocations. + * elf64-x86-64.c (elf_x86_64_link_hash_entry): Add + func_pointer_refcount. + (elf_x86_64_link_hash_newfunc): Clear func_pointer_refcount. + (elf_x86_64_get_local_sym_hash): Likewise. + (elf_x86_64_copy_indirect_symbol): Also copy + func_pointer_refcount. + (elf_x86_64_check_relocs): Increment func_pointer_refcount. + (elf_x86_64_gc_sweep_hook): Decrement func_pointer_refcount. + (elf_x86_64_allocate_dynrelocs): Don't create the PLT entry if + there are only function pointer relocations which can be + resolved at run-time. Keep dynanamic relocations for run-time + function pointer initialization. + (elf_x86_64_relocate_section): Copy dynamic function pointer + relocations. + 2015-09-01 Alan Modra <amodra@gmail.com> * elf64-ppc.c (ppc64_elf_maybe_function_sym): Adjust symbol value |