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11 Commits

Author SHA1 Message Date
Joseph Myers bfff8b1bec Update copyright dates with scripts/update-copyrights. 2017-01-01 00:14:16 +00:00
H.J. Lu ac187dc4ab Always indirect branch to __libc_start_main via GOT 
Since __libc_start_main in libc.so is called very early, lazy binding
isn't relevant.  Always call __libc_start_main with indirect branch via
GOT to avoid extra branch to PLT slot.  In case of static executable,
ld in binutils 2.26 or above can convert indirect branch into direct
branch:

0000000000400a80 <_start>:
  400a80:       31 ed                   xor    %ebp,%ebp
  400a82:       49 89 d1                mov    %rdx,%r9
  400a85:       5e                      pop    %rsi
  400a86:       48 89 e2                mov    %rsp,%rdx
  400a89:       48 83 e4 f0             and    $0xfffffffffffffff0,%rsp
  400a8d:       50                      push   %rax
  400a8e:       54                      push   %rsp
  400a8f:       49 c7 c0 20 1b 40 00    mov    $0x401b20,%r8
  400a96:       48 c7 c1 90 1a 40 00    mov    $0x401a90,%rcx
  400a9d:       48 c7 c7 c0 03 40 00    mov    $0x4003c0,%rdi
  400aa4:       67 e8 96 09 00 00       addr32 callq 401440 <__libc_start_main>
  400aaa:       f4                      hlt

	* sysdeps/x86_64/start.S (_start): Always indirect branch to
	__libc_start_main via GOT.
 2016-06-09 04:43:31 -07:00
H.J. Lu 21683b5a7d Replace @PLT with @GOTPCREL(%rip) in call 
Since __libc_start_main is called very early, lazy binding isn't relevant
here.  Use indirect branch via GOT to avoid extra branch to PLT slot.

	[BZ #19745]
	* sysdeps/x86_64/start.S (_start): __libc_start_main@PLT
	with *__libc_start_main@GOTPCREL(%rip) in call.
 2016-03-04 16:15:41 -08:00
Joseph Myers f7a9f785e5 Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
Joseph Myers b168057aaa Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
Brooks Moses 467fec0bb4 sysdeps/x86_64/start.S doesn't have a .size elf directive for _start. 
This tripped up some analysis I was doing.

This patch is the straightforward fix.

I see no regressions on a "make check" using ENTRY and END.
 2014-11-24 16:26:58 -08:00
Allan McRae d4697bc93d Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
Joseph Myers 2969121014 Remove bounded-pointers handling from x86_64 assembly sources. 2013-02-17 21:57:26 +00:00
Joseph Myers 568035b787 Update copyright notices with scripts/update-copyrights. 2013-01-02 19:05:09 +00:00
H.J. Lu 6cdef1ab36 Update sysdeps/x86_64/start.S for x32 2012-05-14 17:50:41 -07:00
Andreas Jaeger 9d639b9918 Move x86_64/elf files to x86_64 2012-03-19 20:55:26 +01:00