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5 Commits

Author SHA1 Message Date
Alan Modra
2571583aed Update year range in copyright notice of all files. 2017-01-02 14:08:56 +10:30
Alan Modra
982c6f2665 Use variable args in run_ld_link_exec_tests 
If the last parameter of a tcl function is "args" then it can take
zero or more arguments.  Make use of this language feature in
run_ld_link_exec_tests.

	* testsuite/lib/ld-lib.exp (run_ld_link_exec_tests): Replace
	"targets_to_xfail" parameter with "args".
	* testsuite/ld-elf/compress.exp: Remove empty list of xfails on
	all calls to run_ld_link_exec_tests.
	* testsuite/ld-elf/dwarf.exp: Likewise.
	* testsuite/ld-elf/indirect.exp: Likewise.
	* testsuite/ld-elf/wrap.exp: Likewise.
	* testsuite/ld-i386/i386.exp: Likewise.
	* testsuite/ld-i386/no-plt.exp: Likewise.
	* testsuite/ld-i386/tls.exp: Likewise.
	* testsuite/ld-ifunc/ifunc.exp: Likewise.
	* testsuite/ld-pie/pie.exp: Likewise.
	* testsuite/ld-plugin/lto.exp: Likewise.
	* testsuite/ld-size/size.exp: Likewise.
	* testsuite/ld-x86-64/mpx.exp: Likewise.
	* testsuite/ld-x86-64/no-plt.exp: Likewise.
	* testsuite/ld-x86-64/tls.exp: Likewise.
	* testsuite/ld-x86-64/x86-64.exp: Likewise.
	* testsuite/ld-elf/elf.exp: Likewise.  Reorder args when providing
	xfails and simplify lists.
	* testsuite/ld-elf/shared.exp: Likewise.
 2016-07-21 11:34:45 +09:30
H.J. Lu
233cc9c13a Don't generate PLT for IFUNC GOT/pointer reference 
If a backend supports it, PLT entry isn't needed when all references
to a STT_GNU_IFUNC symbols are done via GOT or static function pointers.
For GOT entries, We generate dynamic R_*_GLOB_DAT relocations for
preemptable symbols and R_*_IRELATIVE relocations for non-preemptable
symbols to update them with real function address.  For static pointer
pointers, we generate dynamic pointer relocations and store them in:

1. .rel[a].ifunc section in PIC object.
2. .rel[a].got section in dynamic executable.
3. .rel[a].iplt section in static executable.

We don't allocate GOT entry if it isn't used.

bfd/

	PR ld/20253
	* elf-bfd.h (_bfd_elf_allocate_ifunc_dyn_relocs): Add an
	bfd_boolean argument.
	* elf-ifunc.c (_bfd_elf_create_ifunc_sections): Replace
	"shared object" with "PIC object" in comments.
	(_bfd_elf_allocate_ifunc_dyn_relocs): Updated.  Replace
	"shared object" with "PIC object" in comments.  Avoid PLT if
	requested.  Generate dynamic relocations for non-GOT references.
	Make room for the special first entry in PLT and allocate PLT
	entry only for PLT and PC-relative references.  Store dynamic
	GOT relocations in .rel[a].iplt section for static executables.
	If PLT isn't used, always use GOT for symbol value.  Don't
	allocate GOT entry if it isn't used.
	* elf32-i386.c (elf_i386_check_relocs): Increment PLT reference
	count only in the code section.  Allocate dynamic pointer
	relocation against STT_GNU_IFUNC symbol in the non-code section.
	(elf_i386_adjust_dynamic_symbol): Increment PLT reference count
	only for PC-relative references.
	(elf_i386_allocate_dynrelocs): Pass TRUE to
	_bfd_elf_allocate_ifunc_dyn_relocs.
	(elf_i386_relocate_section): Allow R_386_GOT32/R_386_GOT32X
	relocations against STT_GNU_IFUNC symbols without PLT.  Generate
	dynamic pointer relocation against STT_GNU_IFUNC symbol in
	the non-code section and store it in the proper REL section.
	Don't allow non-pointer relocation against STT_GNU_IFUNC symbol
	without PLT.
	(elf_i386_finish_dynamic_symbol): Generate dynamic
	R_386_IRELATIVE and R_386_GLOB_DAT GOT relocations against
	STT_GNU_IFUNC symbols without PLT.
	(elf_i386_finish_dynamic_sections): Don't handle local
	STT_GNU_IFUNC symbols here.
	(elf_i386_output_arch_local_syms): Handle local STT_GNU_IFUNC
	symbols here.
	(elf_backend_output_arch_local_syms): New.
	* elf32-x86-64.c (elf_i386_check_relocs): Increment PLT reference
	count only in the code section.  Allocate dynamic pointer
	relocation against STT_GNU_IFUNC symbol in the non-code section.
	(elf_x86_64_adjust_dynamic_symbol): Increment PLT reference
	count only for PC-relative references.
	(elf_x86_64_allocate_dynrelocs): Pass TRUE to
	_bfd_elf_allocate_ifunc_dyn_relocs.
	(elf_x86_64_relocate_section): Allow R_X86_64_GOTPCREL,
	R_X86_64_GOTPCRELX, R_X86_64_REX_GOTPCRELX and
	R_X86_64_GOTPCREL64 relocations against STT_GNU_IFUNC symbols
	without PLT.  Generate dynamic pointer relocation against
	STT_GNU_IFUNC symbol in the non-code section and store it in
	the proper RELA section.  Don't allow non-pointer relocation
	against STT_GNU_IFUNC symbol without PLT.
	(elf_x86_64_finish_dynamic_symbol): Generate dynamic
	R_X86_64_IRELATIVE and R_X86_64_GLOB_DAT GOT relocations against
	STT_GNU_IFUNC symbols without PLT.
	(elf_x86_64_finish_dynamic_sections): Don't handle local
	STT_GNU_IFUNC symbols here.
	(elf_x86_64_output_arch_local_syms): Handle local STT_GNU_IFUNC
	symbols here.
	(elf_backend_output_arch_local_syms): New.
	* elfnn-aarch64.c (elfNN_aarch64_allocate_ifunc_dynrelocs):
	Pass FALSE to _bfd_elf_allocate_ifunc_dyn_relocs.

ld/

	PR ld/20253
	* testsuite/ld-i386/i386.exp: Run PR ld/20253 tests.
	* testsuite/ld-i386/no-plt.exp: Likewise.
	* testsuite/ld-x86-64/no-plt.exp: Likewise.
	* testsuite/ld-i386/pr13302.d: Remove .rel.plt section.
	* testsuite/ld-ifunc/ifunc-13-i386.d: Likewise.
	* testsuite/ld-ifunc/ifunc-13-x86-64.d: Likewise.
	* testsuite/ld-ifunc/ifunc-15-i386.d: Likewise.
	* testsuite/ld-ifunc/ifunc-15-x86-64.d: Likewise.
	* testsuite/ld-x86-64/pr13082-5a.d: Likewise.
	* testsuite/ld-x86-64/pr13082-5b.d: Likewise.
	* testsuite/ld-x86-64/pr13082-6a.d: Likewise.
	* testsuite/ld-x86-64/pr13082-6b.d: Likewise.
	* testsuite/ld-i386/pr20244-2a.d: Remove .plt section.
	* testsuite/ld-ifunc/ifunc-21-i386.d: Likewise.
	* testsuite/ld-ifunc/ifunc-21-x86-64.d: Likewise.
	* testsuite/ld-ifunc/ifunc-22-i386.d: Likewise.
	* testsuite/ld-ifunc/ifunc-22-x86-64.d: Likewise.
	* testsuite/ld-i386/pr20244-2b.d: Updated.
	* testsuite/ld-i386/pr20244-2c.d: Likewise.
	* testsuite/ld-ifunc/ifunc-18a-i386.d: Likewise.
	* testsuite/ld-ifunc/ifunc-18a-x86-64.d: Likewise.
	* testsuite/ld-ifunc/ifunc-18b-i386.d: Likewise.
	* testsuite/ld-ifunc/ifunc-18b-x86-64.d: Likewise.
	* testsuite/ld-i386/pr20253-1a.c: New file.
	* testsuite/ld-i386/pr20253-1b.S: Likewise.
	* testsuite/ld-i386/pr20253-1c.S: Likewise.
	* testsuite/ld-i386/pr20253-1d.S: Likewise.
	* testsuite/ld-i386/pr20253-2a.c: Likewise.
	* testsuite/ld-i386/pr20253-2b.S: Likewise.
	* testsuite/ld-i386/pr20253-2c.S: Likewise.
	* testsuite/ld-i386/pr20253-2d.S: Likewise.
	* testsuite/ld-i386/pr20253-3.d: Likewise.
	* testsuite/ld-i386/pr20253-3.s: Likewise.
	* testsuite/ld-i386/pr20253-4.s: Likewise.
	* testsuite/ld-i386/pr20253-4a.d: Likewise.
	* testsuite/ld-i386/pr20253-4b.d: Likewise.
	* testsuite/ld-i386/pr20253-4c.d: Likewise.
	* testsuite/ld-i386/pr20253-5.d: Likewise.
	* testsuite/ld-i386/pr20253-5.s: Likewise.
	* testsuite/ld-ifunc/ifunc-23-x86.s: Likewise.
	* testsuite/ld-ifunc/ifunc-23a-x86.d: Likewise.
	* testsuite/ld-ifunc/ifunc-23b-x86.d: Likewise.
	* testsuite/ld-ifunc/ifunc-23c-x86.d: Likewise.
	* testsuite/ld-ifunc/ifunc-24-x86.s: Likewise.
	* testsuite/ld-ifunc/ifunc-24a-x86.d: Likewise.
	* testsuite/ld-ifunc/ifunc-24b-x86.d: Likewise.
	* testsuite/ld-ifunc/ifunc-24c-x86.d: Likewise.
	* testsuite/ld-ifunc/ifunc-25-x86.s: Likewise.
	* testsuite/ld-ifunc/ifunc-25a-x86.d: Likewise.
	* testsuite/ld-ifunc/ifunc-25b-x86.d: Likewise.
	* testsuite/ld-ifunc/ifunc-25c-x86.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1.s: Likewise.
	* testsuite/ld-x86-64/pr20253-1a.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1b.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1c.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1d.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1e.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1f.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1g.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1h.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1i.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1j.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1k.d: Likewise.
	* testsuite/ld-x86-64/pr20253-1l.d: Likewise.
	* testsuite/ld-x86-64/pr20253-2a.c: Likewise.
	* testsuite/ld-x86-64/pr20253-2b.S: Likewise.
	* testsuite/ld-x86-64/pr20253-2c.S: Likewise.
	* testsuite/ld-x86-64/pr20253-2d.S: Likewise.
	* testsuite/ld-x86-64/pr20253-3.d: Likewise.
	* testsuite/ld-x86-64/pr20253-3.s: Likewise.
	* testsuite/ld-x86-64/pr20253-4.s: Likewise.
	* testsuite/ld-x86-64/pr20253-4a.d: Likewise.
	* testsuite/ld-x86-64/pr20253-4b.d: Likewise.
	* testsuite/ld-x86-64/pr20253-4c.d: Likewise.
	* testsuite/ld-x86-64/pr20253-4d.d: Likewise.
	* testsuite/ld-x86-64/pr20253-4e.d: Likewise.
	* testsuite/ld-x86-64/pr20253-4f.d: Likewise.
	* testsuite/ld-x86-64/pr20253-5.s: Likewise.
	* testsuite/ld-x86-64/pr20253-5a.d: Likewise.
	* testsuite/ld-x86-64/pr20253-5b.d: Likewise.
	* testsuite/ld-ifunc/ifunc-18a-i386.d: Remove extra IRELATIVE
	relocation.
	* testsuite/ld-ifunc/ifunc-18a-x86-64.d: Likewise.
	* testsuite/ld-ifunc/ifunc-18b-i386.d: Likewise.
	* testsuite/ld-ifunc/ifunc-18b-x86-64.d: Likewise.
	* testsuite/ld-ifunc/ifunc-18a.s: Fix a typo.
	* testsuite/ld-x86-64/x86-64.exp: Run pr20253-1 tests.
 2016-06-18 09:17:25 -07:00
H.J. Lu
712ec27916 Add the GOT base for GOT32 relocs against IFUNC 
Add the GOT base for R_386_GOT32/R_386_GOT32X relocations against IFUNC
symbols if there is no base register and disallow them for PIC.

bfd/

	PR ld/20244
	* elf32-i386.c (elf_i386_relocate_section): Add the .got.plt
	section address for R_386_GOT32/R_386_GOT32X relocations against
	IFUNC symbols if there is no base register and return error for
	PIC.

ld/

	PR ld/20244
	* testsuite/ld-i386/i386.exp: Run pr20244-2a, pr20244-2b,
	pr20244-2c and pr20244-2d.
	* testsuite/ld-i386/no-plt.exp: Run pr20244-3a and pr20244-3b.
	* testsuite/ld-i386/pr20244-2.s: New file.
	* testsuite/ld-i386/pr20244-2a.d: Likewise.
	* testsuite/ld-i386/pr20244-2b.d: Likewise.
	* testsuite/ld-i386/pr20244-2c.d: Likewise.
	* testsuite/ld-i386/pr20244-2d.d: Likewise.
	* testsuite/ld-i386/pr20244-3a.c: Likewise.
	* testsuite/ld-i386/pr20244-3b.S: Likewise.
	* testsuite/ld-i386/pr20244-3c.S: Likewise.
	* testsuite/ld-i386/pr20244-3d.S: Likewise.
 2016-06-13 11:11:23 -07:00
H.J. Lu
ffc89b17f2 i386: Test external function reference without PLT 
To call an external function, the direct branch to the PLT entry can be
replaced by an indirect branch via the GOT slot, which is similar to the
first instruction in the PLT slot.  Instead using the PLT slot as function
address, the function address is retrieved from the GOT slot.  The
R_386_GOT32X relocation can be used to compute the address of the symbol’s
GOT entry without base register when PIC is disabled.  In non-PIC
executable,

call/jmp *func@GOT

should be used for indirect branch via the GOT slot and

movl func@GOT, %eax

should be used to load function address.  Unlike PIC case, no register
is needed to access GOT.  If linker determines the function is defined
locally, it converts indirect branch via the GOT slot to direct branch
with a nop prefix and converts load via the GOT slot to load immediate
or lea.

	* testsuite/ld-i386/libno-plt-1b.dd: New file.
	* testsuite/ld-i386/libno-plt-1b.rd: Likewise.
	* testsuite/ld-i386/no-plt-1a.dd: Likewise.
	* testsuite/ld-i386/no-plt-1a.rd: Likewise.
	* testsuite/ld-i386/no-plt-1b.dd: Likewise.
	* testsuite/ld-i386/no-plt-1b.rd: Likewise.
	* testsuite/ld-i386/no-plt-1c.dd: Likewise.
	* testsuite/ld-i386/no-plt-1c.rd: Likewise.
	* testsuite/ld-i386/no-plt-1d.dd: Likewise.
	* testsuite/ld-i386/no-plt-1d.rd: Likewise.
	* testsuite/ld-i386/no-plt-1e.dd: Likewise.
	* testsuite/ld-i386/no-plt-1e.rd: Likewise.
	* testsuite/ld-i386/no-plt-1f.dd: Likewise.
	* testsuite/ld-i386/no-plt-1f.rd: Likewise.
	* testsuite/ld-i386/no-plt-1g.dd: Likewise.
	* testsuite/ld-i386/no-plt-1g.rd: Likewise.
	* testsuite/ld-i386/no-plt-1h.dd: Likewise.
	* testsuite/ld-i386/no-plt-1h.rd: Likewise.
	* testsuite/ld-i386/no-plt-1i.dd: Likewise.
	* testsuite/ld-i386/no-plt-1i.rd: Likewise.
	* testsuite/ld-i386/no-plt-1j.dd: Likewise.
	* testsuite/ld-i386/no-plt-1j.rd: Likewise.
	* testsuite/ld-i386/no-plt-check1a.S: Likewise.
	* testsuite/ld-i386/no-plt-check1b.S: Likewise.
	* testsuite/ld-i386/no-plt-extern1a.S: Likewise.
	* testsuite/ld-i386/no-plt-extern1b.S: Likewise.
	* testsuite/ld-i386/no-plt-func1.c: Likewise.
	* testsuite/ld-i386/no-plt-main1.c: Likewise.
	* testsuite/ld-i386/no-plt.exp: Likewise.
 2016-06-08 12:41:50 -07:00