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bae420ef26
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4 Commits

Author SHA1 Message Date
H.J. Lu
bae420ef26 Optimize x86 GOT32X/GOTPCRELX relocations 
R_386_GOT32X, R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX relocations
retrieve the symbol address via its GOT slot.  If the symbol address is
known at the link-time, we can use it directly by changing instruction
encoding.  Indirect branch can only be converted to PC relative direct
branch.  MOV can be changed to LEA or encoded differently with signed
address.  The subset of binary operations can be encoded only with
signed address.

If undefined weak symbol is resolved to zero link-time, we can use it
as address.  Zero addresss can't used with PC relative direct branch
when PIC is true since the current PC is unknown.  In 64-bit, 32-bit
relocation for PC relatiave direct branch to zero may also overflow.

If this optimization causes relocation overflow, --no-relax can be used
to work around it.

bfd/

	PR ld/19609
	* elf32-i386.c (elf_i386_convert_load): Convert to R_386_32 for
	load with locally bound symbols if PIC is false or there is no
	base register.  Optimize branch to 0 if PIC is false.
	(elf_i386_relocate_section): Don't generate dynamic relocations
	against undefined weak symbols if PIC is false.
	* elf64-x86-64.c (elf_x86_64_convert_load): Disable optimization
	if we can't estimate relocation overflow with --no-relax.
	Convert to R_X86_64_32S/R_X86_64_32 for load with locally bound
	symbols if PIC is false.  Optimize branch to 0 if PIC is false.
	(elf_x86_64_relocate_section): Don't generate dynamic relocations
	against undefined weak symbols if PIC is false.

ld/

	PR ld/19609
	* testsuite/ld-i386/got1.dd: Updated.
	* testsuite/ld-i386/lea1c.d: Likewise.
	* testsuite/ld-i386/load1-nacl.d: Likewise.
	* testsuite/ld-i386/load1.d: Likewise.
	* testsuite/ld-i386/load4b.d: Likewise.
	* testsuite/ld-i386/load5b.d: Likewise.
	* testsuite/ld-i386/mov1b.d: Likewise.
	* testsuite/ld-x86-64/mov1b.d: Likewise.
	* testsuite/ld-x86-64/mov1d.d: Likewise.
	* 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-x86-64/gotpcrel1.dd: Likewise.
	* testsuite/ld-x86-64/lea1a.d: Likewise.
	* testsuite/ld-x86-64/lea1b.d: Likewise.
	* testsuite/ld-x86-64/lea1c.d: Likewise.
	* testsuite/ld-x86-64/lea1d.d: Likewise.
	* testsuite/ld-x86-64/lea1e.d: Likewise.
	* testsuite/ld-x86-64/lea1f.d: Likewise.
	* testsuite/ld-x86-64/mov1b.d: Likewise.
	* testsuite/ld-x86-64/mov1d.d: Likewise.
	* testsuite/ld-x86-64/pr13082-3b.d: Likewise.
	* testsuite/ld-x86-64/pr13082-4b.d: Likewise.
	* testsuite/ld-x86-64/lea1.s: Add tests for 32-bit registers.
	* testsuite/ld-i386/pr19609-1.s: New file.
	* testsuite/ld-i386/pr19609-1a.d: Likewise.
	* testsuite/ld-i386/pr19609-1b.d: Likewise.
	* testsuite/ld-i386/pr19609-1c.d: Likewise.
	* testsuite/ld-i386/pr19609-1d.d: Likewise.
	* testsuite/ld-i386/pr19609-1e.d: Likewise.
	* testsuite/ld-i386/pr19609-1f.d: Likewise.
	* testsuite/ld-i386/pr19609-1g.d: Likewise.
	* testsuite/ld-i386/pr19609-1h.d: Likewise.
	* testsuite/ld-i386/pr19609-1i.d: Likewise.
	* testsuite/ld-i386/pr19609-2.s: Likewise.
	* testsuite/ld-i386/pr19609-2a.d: Likewise.
	* testsuite/ld-i386/pr19609-2b.d: Likewise.
	* testsuite/ld-i386/pr19609-2c.d: Likewise.
	* testsuite/ld-i386/undefweak.s: Likewise.
	* testsuite/ld-i386/undefweaka.d: Likewise.
	* testsuite/ld-i386/undefweakb.d: Likewise.
	* testsuite/ld-x86-64/pr13082-3c.d: Likewise.
	* testsuite/ld-x86-64/pr13082-3d.d: Likewise.
	* testsuite/ld-x86-64/pr19609-1.s: Likewise.
	* testsuite/ld-x86-64/pr19609-1a.d: Likewise.
	* testsuite/ld-x86-64/pr19609-1b.d: Likewise.
	* testsuite/ld-x86-64/pr19609-1c.d: Likewise.
	* testsuite/ld-x86-64/pr19609-1d.d: Likewise.
	* testsuite/ld-x86-64/pr19609-1e.d: Likewise.
	* testsuite/ld-x86-64/pr19609-1f.d: Likewise.
	* testsuite/ld-x86-64/pr19609-1g.d: Likewise.
	* testsuite/ld-x86-64/pr19609-1h.d: Likewise.
	* testsuite/ld-x86-64/pr19609-1i.d: Likewise.
	* testsuite/ld-x86-64/pr19609-1j.d: Likewise.
	* testsuite/ld-x86-64/pr19609-1k.d: Likewise.
	* testsuite/ld-x86-64/pr19609-1l.d: Likewise.
	* testsuite/ld-x86-64/pr19609-1m.d: Likewise.
	* testsuite/ld-x86-64/pr19609-2.s: Likewise.
	* testsuite/ld-x86-64/pr19609-2a.d: Likewise.
	* testsuite/ld-x86-64/pr19609-2b.d: Likewise.
	* testsuite/ld-x86-64/pr19609-2c.d: Likewise.
	* testsuite/ld-x86-64/pr19609-2d.d: Likewise.
	* testsuite/ld-x86-64/pr19609-3.s: Likewise.
	* testsuite/ld-x86-64/pr19609-3a.d: Likewise.
	* testsuite/ld-x86-64/pr19609-3b.d: Likewise.
	* testsuite/ld-x86-64/pr19609-4.s: Likewise.
	* testsuite/ld-x86-64/pr19609-4a.d: Likewise.
	* testsuite/ld-x86-64/pr19609-4b.d: Likewise.
	* testsuite/ld-x86-64/pr19609-4c.d: Likewise.
	* testsuite/ld-x86-64/pr19609-4d.d: Likewise.
	* testsuite/ld-x86-64/pr19609-4e.d: Likewise.
	* testsuite/ld-x86-64/pr19609-5.s: Likewise.
	* testsuite/ld-x86-64/pr19609-5a.d: Likewise.
	* testsuite/ld-x86-64/pr19609-5b.d: Likewise.
	* testsuite/ld-x86-64/pr19609-5c.d: Likewise.
	* testsuite/ld-x86-64/pr19609-5d.d: Likewise.
	* testsuite/ld-x86-64/pr19609-5e.d: Likewise.
	* testsuite/ld-x86-64/pr19609-6.s: Likewise.
	* testsuite/ld-x86-64/pr19609-6a.d: Likewise.
	* testsuite/ld-x86-64/pr19609-6b.d: Likewise.
	* testsuite/ld-x86-64/pr19609-6c.d: Likewise.
	* testsuite/ld-x86-64/pr19609-6d.d: Likewise.
	* testsuite/ld-x86-64/pr19609-7.s: Likewise.
	* testsuite/ld-x86-64/pr19609-7a.d: Likewise.
	* testsuite/ld-x86-64/pr19609-7b.d: Likewise.
	* testsuite/ld-x86-64/pr19609-7c.d: Likewise.
	* testsuite/ld-x86-64/pr19609-7d.d: Likewise.
	* testsuite/ld-i386/i386.exp: Run undefweak tests and tests for
	PR ld/19609.
	* testsuite/ld-x86-64/x86-64.exp: Run pr13082-3c, pr13082-3d
	and tests for PR ld/19609.
 2016-02-26 09:39:24 -08:00
H.J. Lu
0cb4071ef9 Add -mrelax-relocations= to x86 assembler 
The x86 relax relocations introduced in binutils 2.26 aren't supported
by linker on Solaris older than Solaris 12.  To use x86 assembler with
older Solaris linker, this patch adds

1. A command line option -mrelax-relocations= to x86 assembler to
control whether to generate relax relocations.
2. A configure option --enable-x86-relax-relocations to decide whether
x86 assembler should generate relax relocations by default.  It is
defaulted to yes, except for x86 Solaris targets older than Solaris 12.

gas/

	PR gas/19520
	* NEWS: Mention new command line option -mrelax-relocations and
	new configure option --enable-x86-relax-relocations for x86
	target.
	* config.in: Regenerated.
	* configure.ac: Add --enable-x86-relax-relocations.
	(ac_default_x86_relax_relocations): New.  Default to 1 except
	for x86 Solaris targets older than Solaris 12.
	(DEFAULT_GENERATE_X86_RELAX_RELOCATIONS): Define.
	* configure: Likewise.
	* config/tc-i386.c (generate_relax_relocations): New.
	(OPTION_MRELAX_RELOCATIONS): Likewise.
	(output_disp): Don't generate relax relocations if
	generate_relax_relocations is 0.
	(md_longopts): Add -mrelax-relocations.
	(md_show_usage): Likewise.
	(md_parse_option): Handle OPTION_MRELAX_RELOCATIONS.
	* doc/c-i386.texi: Document -mrelax-relocations=.
	* testsuite/gas/i386/got-no-relax.d: New file.
	* testsuite/gas/i386/x86-64-gotpcrel-no-relax.d: Likewise.
	* testsuite/gas/i386/got.d: Pass -mrelax-relocations=yes to as.
	* testsuite/gas/i386/localpic.d: Likewise.
	* testsuite/gas/i386/mixed-mode-reloc32.d: Likewise.
	* testsuite/gas/i386/reloc32.d: Likewise.
	* testsuite/gas/i386/x86-64-gotpcrel.d: Likewise.
	* testsuite/gas/i386/x86-64-localpic.d: Likewise.
	* testsuite/gas/i386/ilp32/x86-64-gotpcrel.d: Likewise.
	* testsuite/gas/i386/ilp32/x86-64-localpic.d: Likewise.
	* testsuite/gas/i386/i386.exp: Run got-no-relax and
	x86-64-gotpcrel-no-relax.

ld/

	PR gas/19520
	* testsuite/ld-i386/branch1.d: Pass -mrelax-relocations=yes to as.
	* testsuite/ld-i386/call1.d: Likewise.
	* testsuite/ld-i386/call2.d: Likewise.
	* testsuite/ld-i386/call3a.d: Likewise.
	* testsuite/ld-i386/call3b.d: Likewise.
	* testsuite/ld-i386/call3c.d: Likewise.
	* testsuite/ld-i386/call3d.d: Likewise.
	* testsuite/ld-i386/call3e.d: Likewise.
	* testsuite/ld-i386/call3f.d: Likewise.
	* testsuite/ld-i386/call3g.d: Likewise.
	* testsuite/ld-i386/call3h.d: Likewise.
	* testsuite/ld-i386/jmp1.d: Likewise.
	* testsuite/ld-i386/jmp2.d: Likewise.
	* testsuite/ld-i386/lea1c.d: Likewise.
	* testsuite/ld-i386/load1.d: Likewise.
	* testsuite/ld-i386/load2.d: Likewise.
	* testsuite/ld-i386/load3.d: Likewise.
	* testsuite/ld-i386/load4a.d: Likewise.
	* testsuite/ld-i386/load5a.d: Likewise.
	* testsuite/ld-i386/mov2b.d: Likewise.
	* testsuite/ld-i386/mov3.d: Likewise.
	* testsuite/ld-ifunc/ifunc-21-x86-64.d: Likewise.
	* testsuite/ld-ifunc/ifunc-22-x86-64.d: Likewise.
	* testsuite/ld-ifunc/ifunc-5r-local-x86-64.d: Likewise.
	* testsuite/ld-x86-64/call1a.d: Likewise.
	* testsuite/ld-x86-64/call1b.d: Likewise.
	* testsuite/ld-x86-64/call1c.d: Likewise.
	* testsuite/ld-x86-64/call1d.d: Likewise.
	* testsuite/ld-x86-64/call1e.d: Likewise.
	* testsuite/ld-x86-64/call1f.d: Likewise.
	* testsuite/ld-x86-64/call1h.d: Likewise.
	* testsuite/ld-x86-64/call1i.d: Likewise.
	* testsuite/ld-x86-64/load1a.d: Likewise.
	* testsuite/ld-x86-64/load1b.d: Likewise.
	* testsuite/ld-i386/got1a.S: Load GOT into %ecx and use it.
	* testsuite/ld-i386/got1.dd: Updated.
	* testsuite/ld-i386/got1d.S (1): Removed.
	* testsuite/ld-i386/i386.exp: Add -Wa,-mrelax-relocations=yes.
	* testsuite/ld-x86-64/x86-64.exp: Likewise.
 2016-02-03 08:25:15 -08:00
H.J. Lu
8c650f161a Add ifunc tests for call, jmp, add, test 
* ld-ifunc/ifunc-21-i386.s: Add tests for call, jmp, add, test.
	* ld-ifunc/ifunc-21-x86-64.s: Likewise.
	* ld-ifunc/ifunc-22-i386.s: Likewise.
	* ld-ifunc/ifunc-22-x86-64.s: Likewise.
	* ld-ifunc/ifunc-21-i386.d: Updated.
	* ld-ifunc/ifunc-21-x86-64.d: Likewise.
	* ld-ifunc/ifunc-22-i386.d: Likewise.
	* ld-ifunc/ifunc-22-x86-64.d: Likewise.
 2015-09-03 04:03:13 -07:00
H.J. Lu
0762fbb6a7 Add 2 ifunc tests for i386 and x86-64 
* ld-ifunc/ifunc-21-i386.d: Likewise.
	* ld-ifunc/ifunc-21-i386.s: Likewise.
	* ld-ifunc/ifunc-21-x86-64.d: Likewise.
	* ld-ifunc/ifunc-21-x86-64.s: Likewise.
	* ld-ifunc/ifunc-22-i386.d: Likewise.
	* ld-ifunc/ifunc-22-i386.s: Likewise.
	* ld-ifunc/ifunc-22-x86-64.d: Likewise.
	* ld-ifunc/ifunc-22-x86-64.s: Likewise.
 2015-09-02 15:30:32 -07:00