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| author | Richard Henderson <rth@twiddle.net> | 2014-05-23 15:24:20 -0700 |
|---|---|---|
| committer | Richard Henderson <rth@twiddle.net> | 2014-05-23 21:33:05 -0700 |
| commit | 8820e3acc3bb95b9b0921fe0c0711aae19f1da94 (patch) | |
| tree | fbe1ffe4282f8f71785e675e778b07c975790a14 /nptl | |
| parent | e59252a58edad4bf74a094e22a70811d5585c60f (diff) | |
| download | glibc-8820e3acc3bb95b9b0921fe0c0711aae19f1da94.tar.gz glibc-8820e3acc3bb95b9b0921fe0c0711aae19f1da94.tar.xz glibc-8820e3acc3bb95b9b0921fe0c0711aae19f1da94.zip | |
Only support ifunc in nptl/pt-vfork.c
* nptl/pt-vfork.c: Error if !HAVE_IFUNC. [!HAVE_IFUNC] (vfork_compat): Remove. [!HAVE_IFUNC] (DEFINE_VFORK): Remove.
Diffstat (limited to 'nptl')
| -rw-r--r-- | nptl/pt-vfork.c | 36 |
1 files changed, 17 insertions, 19 deletions
diff --git a/nptl/pt-vfork.c b/nptl/pt-vfork.c index 81d1b7195b..eaffe48f53 100644 --- a/nptl/pt-vfork.c +++ b/nptl/pt-vfork.c @@ -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 |