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x86: Dump local IFUNC functions in the map file

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Dump local IFUNC functions in the map file when generating IRELATIVE
relocations if -Map is used.

bfd/

	* elf32-i386.c (elf_i386_check_relocs): Set local IFUNC symbol
	name.  Use local IFUNC symbol name string to report unsupported
	non-PIC call to IFUNC function.
	(elf_i386_relocate_section): Dump local IFUNC name with minfo
	when generating R_386_IRELATIVE relocation.
	(elf_i386_finish_dynamic_symbol): Likewise.
	* elf_x86_64_check_relocs (elf_x86_64_check_relocs): Set local
	IFUNC symbol name.
	(elf_x86_64_relocate_section): Dump local IFUNC name with minfo
	when generating R_X86_64_IRELATIVE relocation.
	(elf_x86_64_finish_dynamic_symbol): Likewise.

ld/

	* testsuite/ld-ifunc/ifunc-1-local-x86.d: Pass
	"-Map tmpdir/ifunc-1-local-x86.map" to ld and check
	ifunc-1-local-x86.map.
	* testsuite/ld-ifunc/ifunc-1-x86.d: Pass
	"-Map tmpdir/ifunc-1-x86.map" to ld and check ifunc-1-x86.map.
	* testsuite/ld-ifunc/ifunc-1-local-x86.map: New file.
	* testsuite/ld-ifunc/ifunc-1-x86.map: Likewise.
This commit is contained in:
H.J. Lu 2017-06-07 21:18:01 -07:00
parent 51fa2693ad
commit 6322e5c5cb
6 changed files with 43 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
bfd/elf32-i386.c
View File

@ -1945,6 +1945,8 @@ elf_i386_check_relocs (bfd *abfd,
goto error_return;
/* Fake a STT_GNU_IFUNC symbol. */
h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
isym, NULL);
h->type = STT_GNU_IFUNC;
h->def_regular = 1;
h->ref_regular = 1;
@ -2181,15 +2183,10 @@ do_relocation:
else if (h->type == STT_GNU_IFUNC
&& bfd_link_pic (info))
{
if (isym == NULL)
name = h->root.root.string;
else
name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
NULL);
_bfd_error_handler
/* xgettext:c-format */
(_("%B: unsupported non-PIC call to IFUNC `%s'"),
abfd, name);
abfd, h->root.root.string);
bfd_set_error (bfd_error_bad_value);
goto error_return;
}
@ -4081,6 +4078,10 @@ do_ifunc_pointer:
|| h->forced_local
|| bfd_link_executable (info))
{
info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
h->root.root.string,
h->root.u.def.section->owner);
/* This symbol is resolved locally. */
outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
bfd_put_32 (output_bfd,
@ -5413,6 +5414,10 @@ elf_i386_finish_dynamic_symbol (bfd *output_bfd,
&& h->def_regular
&& h->type == STT_GNU_IFUNC))
{
info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
h->root.root.string,
h->root.u.def.section->owner);
/* If an STT_GNU_IFUNC symbol is locally defined, generate
R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
in the .got.plt section. */
@ -5548,6 +5553,10 @@ elf_i386_finish_dynamic_symbol (bfd *output_bfd,
}
if (SYMBOL_REFERENCES_LOCAL (info, h))
{
info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
h->root.root.string,
h->root.u.def.section->owner);
bfd_put_32 (output_bfd,
(h->root.u.def.value
+ h->root.u.def.section->output_section->vma

15
bfd/elf64-x86-64.c
View File

@ -2281,6 +2281,8 @@ elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
goto error_return;
/* Fake a STT_GNU_IFUNC symbol. */
h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
isym, NULL);
h->type = STT_GNU_IFUNC;
h->def_regular = 1;
h->ref_regular = 1;
@ -4422,6 +4424,10 @@ do_ifunc_pointer:
|| h->forced_local
|| bfd_link_executable (info))
{
info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
h->root.root.string,
h->root.u.def.section->owner);
/* This symbol is resolved locally. */
outrel.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
outrel.r_addend = (h->root.u.def.value
@ -5791,6 +5797,10 @@ elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
&& h->def_regular
&& h->type == STT_GNU_IFUNC))
{
info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
h->root.root.string,
h->root.u.def.section->owner);
/* If an STT_GNU_IFUNC symbol is locally defined, generate
R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
rela.r_info = htab->r_info (0, R_X86_64_IRELATIVE);
@ -5941,6 +5951,11 @@ elf_x86_64_finish_dynamic_symbol (bfd *output_bfd,
}
if (SYMBOL_REFERENCES_LOCAL (info, h))
{
info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
output_bfd,
h->root.root.string,
h->root.u.def.section->owner);
rela.r_info = htab->r_info (0,
R_X86_64_IRELATIVE);
rela.r_addend = (h->root.u.def.value

3
ld/testsuite/ld-ifunc/ifunc-1-local-x86.d
View File

@ -1,6 +1,7 @@
#ld: -shared
#ld: -shared -Map tmpdir/ifunc-1-local-x86.map
#objdump: -dw
#target: x86_64-*-* i?86-*-*
#map: ifunc-1-local-x86.map
#...
[ \t0-9a-f]+:[ \t0-9a-f]+call[ \t0-9a-fq]+<\*ABS\*(\+0x160|\+0x170|\+0x1e0|)@plt>

3
ld/testsuite/ld-ifunc/ifunc-1-local-x86.map Normal file
View File

@ -0,0 +1,3 @@
#...
Local IFUNC function `__GI_foo' in tmpdir/ifunc-1-local-x86.o
#pass

3
ld/testsuite/ld-ifunc/ifunc-1-x86.d
View File

@ -1,6 +1,7 @@
#ld: -shared
#ld: -shared -Map tmpdir/ifunc-1-x86.map
#objdump: -dw
#target: x86_64-*-* i?86-*-*
#map: ifunc-1-x86.map
#...
[ \t0-9a-f]+:[ \t0-9a-f]+call[ \t0-9a-fq]+<\*ABS\*(\+0x170|\+0x190|\+0x210|)@plt>

3
ld/testsuite/ld-ifunc/ifunc-1-x86.map Normal file
View File

@ -0,0 +1,3 @@
#...
Local IFUNC function `__GI_foo' in tmpdir/ifunc-1-x86.o
#pass