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[PATCH] ld: Unify STT_GNU_IFUNC handling
- From: "H.J. Lu" <hongjiu dot lu at intel dot com>
- To: binutils at sourceware dot org
- Date: Fri, 25 May 2018 09:37:47 -0700
- Subject: [PATCH] ld: Unify STT_GNU_IFUNC handling
- Reply-to: "H.J. Lu" <hjl dot tools at gmail dot com>
Take STT_GNU_IFUNC handling scattered across targets and gather it in
the generic ELF linker.
OK for master?
H.J.
---
bfd/
PR ld/23238
* elf-s390-common.c (elf_s390_add_symbol_hook): Removed.
* elf32-arc.c (elf_arc_add_symbol_hook): Likewise.
(elf_backend_add_symbol_hook): Likewise.
* elf32-m68k.c (elf_m68k_add_symbol_hook): Likewise.
(elf_backend_add_symbol_hook): Likewise.
* elf32-s390.c (elf_backend_add_symbol_hook): Likewise.
* elf32-sparc.c (elf32_sparc_add_symbol_hook): Likewise.
(elf_backend_add_symbol_hook): Likewise.
* elf64-s390.c (elf_backend_add_symbol_hook): Likewise.
* elfxx-aarch64.c (_bfd_aarch64_elf_add_symbol_hook): Likewise.
* elfxx-aarch64.h (_bfd_aarch64_elf_add_symbol_hook): Likewise.
(elf_backend_add_symbol_hook): Likewise.
* elf32-arm.c (elf32_arm_add_symbol_hook): Remove STT_GNU_IFUNC
handling.
* elf32-ppc.c (ppc_elf_add_symbol_hook): Likewise.
* elf64-ppc.c (ppc64_elf_add_symbol_hook): Likewise.
* elf64-sparc.c (elf64_sparc_add_symbol_hook): Likewise.
* elflink.c (elf_link_add_object_symbols): Set
elf_gnu_symbol_ifunc for STT_GNU_IFUNC symbols.
ld/
PR ld/23238
* testsuite/ld-ifunc/ifunc-26.d: New file.
* testsuite/ld-ifunc/ifunc-26.s: Likewise.
* testsuite/ld-ifunc/ifunc.exp: Run *.d tests without a
working compiler.
---
bfd/elf-s390-common.c | 19 -------------------
bfd/elf32-arc.c | 21 ---------------------
bfd/elf32-arm.c | 5 -----
bfd/elf32-m68k.c | 21 ---------------------
bfd/elf32-ppc.c | 5 -----
bfd/elf32-s390.c | 1 -
bfd/elf32-sparc.c | 21 ---------------------
bfd/elf64-ppc.c | 5 -----
bfd/elf64-s390.c | 1 -
bfd/elf64-sparc.c | 5 -----
bfd/elflink.c | 15 +++++++++++----
bfd/elfxx-aarch64.c | 19 -------------------
bfd/elfxx-aarch64.h | 6 ------
ld/testsuite/ld-ifunc/ifunc-26.d | 7 +++++++
ld/testsuite/ld-ifunc/ifunc-26.s | 8 ++++++++
ld/testsuite/ld-ifunc/ifunc.exp | 14 +++++++-------
16 files changed, 33 insertions(+), 140 deletions(-)
create mode 100644 ld/testsuite/ld-ifunc/ifunc-26.d
create mode 100644 ld/testsuite/ld-ifunc/ifunc-26.s
diff --git a/bfd/elf-s390-common.c b/bfd/elf-s390-common.c
index 21195f2aa5..b37cb25457 100644
--- a/bfd/elf-s390-common.c
+++ b/bfd/elf-s390-common.c
@@ -223,25 +223,6 @@ elf_s390_allocate_local_syminfo (bfd *abfd, Elf_Internal_Shdr *symtab_hdr)
return TRUE;
}
-/* Pick ELFOSABI_GNU if IFUNC symbols are used. */
-
-static bfd_boolean
-elf_s390_add_symbol_hook (bfd *abfd,
- struct bfd_link_info *info,
- Elf_Internal_Sym *sym,
- const char **namep ATTRIBUTE_UNUSED,
- flagword *flagsp ATTRIBUTE_UNUSED,
- asection **secp ATTRIBUTE_UNUSED,
- bfd_vma *valp ATTRIBUTE_UNUSED)
-{
- if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
- && (abfd->flags & DYNAMIC) == 0
- && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
- elf_tdata (info->output_bfd)->has_gnu_symbols |= elf_gnu_symbol_ifunc;
-
- return TRUE;
-}
-
/* Whether to sort relocs output by ld -r or ld --emit-relocs, by
r_offset. Don't do so for code sections. We want to keep ordering
of GDCALL / PLT32DBL for TLS optimizations as is. On the other
diff --git a/bfd/elf32-arc.c b/bfd/elf32-arc.c
index 33fff585e4..a48ef0ca15 100644
--- a/bfd/elf32-arc.c
+++ b/bfd/elf32-arc.c
@@ -2797,26 +2797,6 @@ const struct elf_size_info arc_elf32_size_info =
#define elf_backend_size_info arc_elf32_size_info
-/* Hook called by the linker routine which adds symbols from an object
- file. */
-
-static bfd_boolean
-elf_arc_add_symbol_hook (bfd * abfd,
- struct bfd_link_info * info,
- Elf_Internal_Sym * sym,
- const char ** namep ATTRIBUTE_UNUSED,
- flagword * flagsp ATTRIBUTE_UNUSED,
- asection ** secp ATTRIBUTE_UNUSED,
- bfd_vma * valp ATTRIBUTE_UNUSED)
-{
- if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
- && (abfd->flags & DYNAMIC) == 0
- && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
- elf_tdata (info->output_bfd)->has_gnu_symbols |= elf_gnu_symbol_ifunc;
-
- return TRUE;
-}
-
/* GDB expects general purpose registers to be in section .reg. However Linux
kernel doesn't create this section and instead writes registers to NOTE
section. It is up to the binutils to create a pseudo-section .reg from the
@@ -2946,7 +2926,6 @@ elf32_arc_section_from_shdr (bfd *abfd,
#define elf_backend_finish_dynamic_sections elf_arc_finish_dynamic_sections
#define elf_backend_size_dynamic_sections elf_arc_size_dynamic_sections
-#define elf_backend_add_symbol_hook elf_arc_add_symbol_hook
#define elf_backend_can_gc_sections 1
#define elf_backend_want_got_plt 1
diff --git a/bfd/elf32-arm.c b/bfd/elf32-arm.c
index 5a3b58ff0d..dbfd838fbe 100644
--- a/bfd/elf32-arm.c
+++ b/bfd/elf32-arm.c
@@ -19753,11 +19753,6 @@ elf32_arm_add_symbol_hook (bfd *abfd, struct bfd_link_info *info,
Elf_Internal_Sym *sym, const char **namep,
flagword *flagsp, asection **secp, bfd_vma *valp)
{
- if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
- && (abfd->flags & DYNAMIC) == 0
- && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
- elf_tdata (info->output_bfd)->has_gnu_symbols |= elf_gnu_symbol_ifunc;
-
if (elf32_arm_hash_table (info) == NULL)
return FALSE;
diff --git a/bfd/elf32-m68k.c b/bfd/elf32-m68k.c
index 8680504cee..70532c29ea 100644
--- a/bfd/elf32-m68k.c
+++ b/bfd/elf32-m68k.c
@@ -4589,26 +4589,6 @@ elf_m68k_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
return TRUE;
}
-/* Hook called by the linker routine which adds symbols from an object
- file. */
-
-static bfd_boolean
-elf_m68k_add_symbol_hook (bfd *abfd,
- struct bfd_link_info *info,
- Elf_Internal_Sym *sym,
- const char **namep ATTRIBUTE_UNUSED,
- flagword *flagsp ATTRIBUTE_UNUSED,
- asection **secp ATTRIBUTE_UNUSED,
- bfd_vma *valp ATTRIBUTE_UNUSED)
-{
- if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
- && (abfd->flags & DYNAMIC) == 0
- && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
- elf_tdata (info->output_bfd)->has_gnu_symbols |= elf_gnu_symbol_ifunc;
-
- return TRUE;
-}
-
#define TARGET_BIG_SYM m68k_elf32_vec
#define TARGET_BIG_NAME "elf32-m68k"
#define ELF_MACHINE_CODE EM_68K
@@ -4646,7 +4626,6 @@ elf_m68k_add_symbol_hook (bfd *abfd,
#define elf_backend_object_p elf32_m68k_object_p
#define elf_backend_grok_prstatus elf_m68k_grok_prstatus
#define elf_backend_grok_psinfo elf_m68k_grok_psinfo
-#define elf_backend_add_symbol_hook elf_m68k_add_symbol_hook
#define elf_backend_can_gc_sections 1
#define elf_backend_can_refcount 1
diff --git a/bfd/elf32-ppc.c b/bfd/elf32-ppc.c
index 462c8af311..3482baca20 100644
--- a/bfd/elf32-ppc.c
+++ b/bfd/elf32-ppc.c
@@ -3792,11 +3792,6 @@ ppc_elf_add_symbol_hook (bfd *abfd,
*valp = sym->st_size;
}
- if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
- && (abfd->flags & DYNAMIC) == 0
- && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
- elf_tdata (info->output_bfd)->has_gnu_symbols |= elf_gnu_symbol_ifunc;
-
return TRUE;
}
diff --git a/bfd/elf32-s390.c b/bfd/elf32-s390.c
index b3603bd865..99ceb76d3d 100644
--- a/bfd/elf32-s390.c
+++ b/bfd/elf32-s390.c
@@ -4049,7 +4049,6 @@ elf32_s390_merge_private_bfd_data (bfd *ibfd, struct bfd_link_info *info)
#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 bfd_elf32_mkobject elf_s390_mkobject
diff --git a/bfd/elf32-sparc.c b/bfd/elf32-sparc.c
index 1a18e1ea0f..4378b6177c 100644
--- a/bfd/elf32-sparc.c
+++ b/bfd/elf32-sparc.c
@@ -175,25 +175,6 @@ elf32_sparc_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
}
}
-/* Hook called by the linker routine which adds symbols from an object
- file. */
-
-static bfd_boolean
-elf32_sparc_add_symbol_hook (bfd * abfd,
- struct bfd_link_info * info,
- Elf_Internal_Sym * sym,
- const char ** namep ATTRIBUTE_UNUSED,
- flagword * flagsp ATTRIBUTE_UNUSED,
- asection ** secp ATTRIBUTE_UNUSED,
- bfd_vma * valp ATTRIBUTE_UNUSED)
-{
- if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
- && (abfd->flags & DYNAMIC) == 0
- && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
- elf_tdata (info->output_bfd)->has_gnu_symbols |= elf_gnu_symbol_ifunc;
- return TRUE;
-}
-
#define TARGET_BIG_SYM sparc_elf32_vec
#define TARGET_BIG_NAME "elf32-sparc"
#define ELF_ARCH bfd_arch_sparc
@@ -249,8 +230,6 @@ elf32_sparc_add_symbol_hook (bfd * abfd,
#define elf_backend_want_dynrelro 1
#define elf_backend_rela_normal 1
-#define elf_backend_add_symbol_hook elf32_sparc_add_symbol_hook
-
#define elf_backend_linux_prpsinfo32_ugid16 TRUE
#include "elf32-target.h"
diff --git a/bfd/elf64-ppc.c b/bfd/elf64-ppc.c
index 7f7a8f777e..f543cb0288 100644
--- a/bfd/elf64-ppc.c
+++ b/bfd/elf64-ppc.c
@@ -5034,11 +5034,6 @@ ppc64_elf_add_symbol_hook (bfd *ibfd,
asection **sec,
bfd_vma *value)
{
- if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC
- && (ibfd->flags & DYNAMIC) == 0
- && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
- elf_tdata (info->output_bfd)->has_gnu_symbols |= elf_gnu_symbol_ifunc;
-
if (*sec != NULL
&& strcmp ((*sec)->name, ".opd") == 0)
{
diff --git a/bfd/elf64-s390.c b/bfd/elf64-s390.c
index bfa02340ca..612557fa74 100644
--- a/bfd/elf64-s390.c
+++ b/bfd/elf64-s390.c
@@ -3962,7 +3962,6 @@ const struct elf_size_info s390_elf64_size_info =
#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
diff --git a/bfd/elf64-sparc.c b/bfd/elf64-sparc.c
index b4c04755ce..8c45d3257e 100644
--- a/bfd/elf64-sparc.c
+++ b/bfd/elf64-sparc.c
@@ -444,11 +444,6 @@ elf64_sparc_add_symbol_hook (bfd *abfd, struct bfd_link_info *info,
{
static const char *const stt_types[] = { "NOTYPE", "OBJECT", "FUNCTION" };
- if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
- && (abfd->flags & DYNAMIC) == 0
- && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
- elf_tdata (info->output_bfd)->has_gnu_symbols |= elf_gnu_symbol_ifunc;
-
if (ELF_ST_TYPE (sym->st_info) == STT_REGISTER)
{
int reg;
diff --git a/bfd/elflink.c b/bfd/elflink.c
index 0383e4e370..05d0771a9a 100644
--- a/bfd/elflink.c
+++ b/bfd/elflink.c
@@ -4604,10 +4604,17 @@ error_free_dyn:
(struct bfd_link_hash_entry **) sym_hash)))
goto error_free_vers;
- if ((flags & BSF_GNU_UNIQUE)
- && (abfd->flags & DYNAMIC) == 0
- && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
- elf_tdata (info->output_bfd)->has_gnu_symbols |= elf_gnu_symbol_unique;
+ if ((abfd->flags & DYNAMIC) == 0
+ && (bfd_get_flavour (info->output_bfd)
+ == bfd_target_elf_flavour))
+ {
+ if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
+ elf_tdata (info->output_bfd)->has_gnu_symbols
+ |= elf_gnu_symbol_ifunc;
+ if ((flags & BSF_GNU_UNIQUE))
+ elf_tdata (info->output_bfd)->has_gnu_symbols
+ |= elf_gnu_symbol_unique;
+ }
h = *sym_hash;
/* We need to make sure that indirect symbol dynamic flags are
diff --git a/bfd/elfxx-aarch64.c b/bfd/elfxx-aarch64.c
index 45a732db2b..af37f828d5 100644
--- a/bfd/elfxx-aarch64.c
+++ b/bfd/elfxx-aarch64.c
@@ -558,25 +558,6 @@ _bfd_aarch64_elf_resolve_relocation (bfd_reloc_code_real_type r_type,
return value;
}
-/* Hook called by the linker routine which adds symbols from an object
- file. */
-
-bfd_boolean
-_bfd_aarch64_elf_add_symbol_hook (bfd *abfd, struct bfd_link_info *info,
- Elf_Internal_Sym *sym,
- const char **namep ATTRIBUTE_UNUSED,
- flagword *flagsp ATTRIBUTE_UNUSED,
- asection **secp ATTRIBUTE_UNUSED,
- bfd_vma *valp ATTRIBUTE_UNUSED)
-{
- if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
- && (abfd->flags & DYNAMIC) == 0
- && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
- elf_tdata (info->output_bfd)->has_gnu_symbols |= elf_gnu_symbol_ifunc;
-
- return TRUE;
-}
-
/* Support for core dump NOTE sections. */
bfd_boolean
diff --git a/bfd/elfxx-aarch64.h b/bfd/elfxx-aarch64.h
index 977faf3a4f..301af73e3e 100644
--- a/bfd/elfxx-aarch64.h
+++ b/bfd/elfxx-aarch64.h
@@ -47,11 +47,6 @@ extern bfd_vma
_bfd_aarch64_elf_resolve_relocation (bfd_reloc_code_real_type, bfd_vma, bfd_vma,
bfd_vma, bfd_boolean);
-extern bfd_boolean
-_bfd_aarch64_elf_add_symbol_hook (bfd *, struct bfd_link_info *,
- Elf_Internal_Sym *, const char **,
- flagword *, asection **, bfd_vma *);
-
extern bfd_boolean
_bfd_aarch64_elf_grok_prstatus (bfd *, Elf_Internal_Note *);
@@ -61,7 +56,6 @@ _bfd_aarch64_elf_grok_psinfo (bfd *, Elf_Internal_Note *);
extern char *
_bfd_aarch64_elf_write_core_note (bfd *, char *, int *, int, ...);
-#define elf_backend_add_symbol_hook _bfd_aarch64_elf_add_symbol_hook
#define elf_backend_grok_prstatus _bfd_aarch64_elf_grok_prstatus
#define elf_backend_grok_psinfo _bfd_aarch64_elf_grok_psinfo
#define elf_backend_write_core_note _bfd_aarch64_elf_write_core_note
diff --git a/ld/testsuite/ld-ifunc/ifunc-26.d b/ld/testsuite/ld-ifunc/ifunc-26.d
new file mode 100644
index 0000000000..3b1e9f167a
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/ifunc-26.d
@@ -0,0 +1,7 @@
+#ld: -shared
+#readelf: -h
+
+ELF Header:
+#...
+ OS/ABI: UNIX - GNU
+#pass
diff --git a/ld/testsuite/ld-ifunc/ifunc-26.s b/ld/testsuite/ld-ifunc/ifunc-26.s
new file mode 100644
index 0000000000..2b18d9bc81
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/ifunc-26.s
@@ -0,0 +1,8 @@
+ .text
+ .type resolve_do_it, %function
+resolve_do_it:
+ .byte 0
+ .size resolve_do_it, .-resolve_do_it
+ .globl do_it
+ .type do_it, %gnu_indirect_function
+ .set do_it,resolve_do_it
diff --git a/ld/testsuite/ld-ifunc/ifunc.exp b/ld/testsuite/ld-ifunc/ifunc.exp
index 9f4aa73e7a..dd3abd475a 100644
--- a/ld/testsuite/ld-ifunc/ifunc.exp
+++ b/ld/testsuite/ld-ifunc/ifunc.exp
@@ -48,6 +48,13 @@ if ![check_shared_lib_support] {
# This test does not need a compiler...
run_dump_test "ifuncmod5"
+set test_list [lsort [glob -nocomplain $srcdir/$subdir/*.d]]
+foreach t $test_list {
+ # We need to strip the ".d", but can leave the dirname.
+ verbose [file rootname $t]
+ run_dump_test [file rootname $t]
+}
+
# We need a working compiler. (Strictly speaking this is
# not true, we could use target specific assembler files).
if { [which $CC] == 0 } {
@@ -425,13 +432,6 @@ run_ld_link_exec_tests [list \
] \
]
-set test_list [lsort [glob -nocomplain $srcdir/$subdir/*.d]]
-foreach t $test_list {
- # We need to strip the ".d", but can leave the dirname.
- verbose [file rootname $t]
- run_dump_test [file rootname $t]
-}
-
# Run-time tests which require working IFUNC support.
if { ![check_ifunc_available] } {
return
--
2.17.0