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Only support ifunc in nptl/pt-vfork.c

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* nptl/pt-vfork.c: Error if !HAVE_IFUNC.
	[!HAVE_IFUNC] (vfork_compat): Remove.
	[!HAVE_IFUNC] (DEFINE_VFORK): Remove.
This commit is contained in:
Richard Henderson 2014-05-23 15:24:20 -07:00
parent e59252a58e
commit 8820e3acc3
2 changed files with 23 additions and 19 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2014-05-23 Richard Henderson <rth@twiddle.net>
* nptl/pt-vfork.c: Error if !HAVE_IFUNC.
[!HAVE_IFUNC] (vfork_compat): Remove.
[!HAVE_IFUNC] (DEFINE_VFORK): Remove.
2014-05-23 Joseph Myers <joseph@codesourcery.com>
[BZ #16978]

36
nptl/pt-vfork.c
View File

@ -28,13 +28,24 @@
vfork symbols in libpthread.so; so we define them using IFUNC to
redirect to the libc function. */
/* Note! If the architecture doesn't support IFUNC, then we need an
alternate target-specific mechanism to implement this. So we just
assume IFUNC here and require that the target override this file
if necessary.
If the architecture can assume all supported versions of gcc will
produce a tail-call to __libc_vfork, consider including the version
in sysdeps/unix/sysv/linux/aarch64/pt-vfork.c. */
#if !HAVE_IFUNC
# error "must write pt-vfork for this machine or get IFUNC support"
#endif
#if (SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20) \
|| SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20))
extern __typeof (vfork) __libc_vfork; /* Defined in libc. */
# ifdef HAVE_IFUNC
attribute_hidden __attribute__ ((used))
__typeof (vfork) *
vfork_ifunc (void)
@ -42,29 +53,16 @@ vfork_ifunc (void)
return &__libc_vfork;
}
# ifdef HAVE_ASM_SET_DIRECTIVE
# define DEFINE_VFORK(name) \
# ifdef HAVE_ASM_SET_DIRECTIVE
# define DEFINE_VFORK(name) \
asm (".set " #name ", vfork_ifunc\n" \
".globl " #name "\n" \
".type " #name ", %gnu_indirect_function");
# else
# define DEFINE_VFORK(name) \
# else
# define DEFINE_VFORK(name) \
asm (#name " = vfork_ifunc\n" \
".globl " #name "\n" \
".type " #name ", %gnu_indirect_function");
# endif
# else
attribute_hidden
pid_t
vfork_compat (void)
{
return __libc_vfork ();
}
# define DEFINE_VFORK(name) weak_alias (vfork_compat, name)
# endif
#endif