[PATCH 8/8] Use libc_ifunc macro for siglongjmp, longjmp in libpthread.

[Stefan Liebler]

This updated patch first undefines INIT_ARCH before it is defined.

On 06/23/2016 01:55 PM, Stefan Liebler wrote:
> This patch uses the libc_ifunc macro to create already existing ifunc functions
> longjmp_ifunc, siglongjmp_ifunc if HAVE_IFUNC is defined.
> The s390 pt-longjmp.c includes the common pt-longjmp.c and uses strong_alias
> to create the longjmp, siglongjmp symbols for glibc version 2.19.
>
> ChangeLog:
>
> 	* nptl/pt-longjmp.c (DEFINE_LONGJMP): Use libc_ifunc macro.
> 	* sysdeps/unix/sysv/linux/s390/pt-longjmp.c (longjmp, siglongjmp):
> 	Use strong_alias to create symbols for glibc verison 2.19.
> ---
>   nptl/pt-longjmp.c                         | 23 +++++------------------
>   sysdeps/unix/sysv/linux/s390/pt-longjmp.c |  4 ++--
>   2 files changed, 7 insertions(+), 20 deletions(-)
>
> diff --git a/nptl/pt-longjmp.c b/nptl/pt-longjmp.c
> index a1cc286..7c452cb 100644
> --- a/nptl/pt-longjmp.c
> +++ b/nptl/pt-longjmp.c
> @@ -32,24 +32,11 @@
>
>   # if HAVE_IFUNC
>
> -static __typeof (longjmp) *
> -__attribute__ ((used))
> -longjmp_resolve (void)
> -{
> -  return &__libc_longjmp;
> -}
> +#  define INIT_ARCH()
> +#  define DEFINE_LONGJMP(name) libc_ifunc (name, &__libc_longjmp)
>
> -#  ifdef HAVE_ASM_SET_DIRECTIVE
> -#   define DEFINE_LONGJMP(name) \
> -  asm (".set " #name ", longjmp_resolve\n" \
> -       ".globl " #name "\n" \
> -       ".type " #name ", %gnu_indirect_function");
> -#  else
> -#   define DEFINE_LONGJMP(name) \
> -  asm (#name " = longjmp_resolve\n" \
> -       ".globl " #name "\n" \
> -       ".type " #name ", %gnu_indirect_function");
> -#  endif
> +extern __typeof(longjmp) longjmp_ifunc;
> +extern __typeof(siglongjmp) siglongjmp_ifunc;
>
>   # else  /* !HAVE_IFUNC */
>
> @@ -66,7 +53,7 @@ longjmp_compat (jmp_buf env, int val)
>   DEFINE_LONGJMP (longjmp_ifunc)
>   compat_symbol (libpthread, longjmp_ifunc, longjmp, GLIBC_2_0);
>
> -DEFINE_LONGJMP (siglongjmp_ifunc)
> +strong_alias (longjmp_ifunc, siglongjmp_ifunc)
>   compat_symbol (libpthread, siglongjmp_ifunc, siglongjmp, GLIBC_2_0);
>
>   #endif
> diff --git a/sysdeps/unix/sysv/linux/s390/pt-longjmp.c b/sysdeps/unix/sysv/linux/s390/pt-longjmp.c
> index 10e825c..2abf112 100644
> --- a/sysdeps/unix/sysv/linux/s390/pt-longjmp.c
> +++ b/sysdeps/unix/sysv/linux/s390/pt-longjmp.c
> @@ -26,8 +26,8 @@
>   /* In glibc release 2.19 new versions of longjmp-functions were introduced,
>      but were reverted before 2.20. Thus both versions are the same function.  */
>
> -DEFINE_LONGJMP (__v2longjmp)
> +strong_alias (longjmp_ifunc, __v2longjmp)
>   compat_symbol (libpthread, __v2longjmp, longjmp, GLIBC_2_19);
> -DEFINE_LONGJMP (__v2siglongjmp)
> +strong_alias (siglongjmp_ifunc, __v2siglongjmp)
>   compat_symbol (libpthread, __v2siglongjmp, siglongjmp, GLIBC_2_19);
>   #endif /* SHLIB_COMPAT (libpthread, GLIBC_2_19, GLIBC_2_20))  */
>
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