From: Colin Ian King <colin.king-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>
To: mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
Cc: linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: aarch64 clone() man page omission
Date: Mon, 25 Apr 2016 20:42:18 +0100 [thread overview]
Message-ID: <571E731A.6050809@canonical.com> (raw)
Hi there,
currently, the aarch64 clone() system call requires the stack to be
aligned at a 16 byte boundary, see arch/arm64/kernel/process.c,
copy_thread():
if (stack_start) {
if (is_compat_thread(task_thread_info(p)))
childregs->compat_sp = stack_start;
/* 16-byte aligned stack mandatory on AArch64 */
else if (stack_start & 15)
return -EINVAL;
else
childregs->sp = stack_start;
}
..and returns -EINVAL if not aligned correctly. This should be added to
the manual page clone(2) as it took me a while to figure out why clone()
was failing with -EINVAL for aarch64 but not on x86.
Colin
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next reply other threads:[~2016-04-25 19:42 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-25 19:42 Colin Ian King [this message]
[not found] ` <571E731A.6050809-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>
2016-05-09 21:01 ` aarch64 clone() man page omission Michael Kerrisk (man-pages)
2016-05-09 21:31 ` Mike Frysinger
[not found] ` <20160509213140.GD26300-UgUKS2FnFs9+urZeOPWqwQ@public.gmane.org>
2016-05-09 21:40 ` Colin Ian King
[not found] ` <573103C8.9050008-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>
2016-05-11 2:50 ` Mike Frysinger
[not found] ` <20160511025040.GL26300-UgUKS2FnFs9+urZeOPWqwQ@public.gmane.org>
2016-05-11 13:18 ` Catalin Marinas
[not found] ` <20160511131855.GG3051-M2fw3Uu6cmfZROr8t4l/smS4ubULX0JqMm0uRHvK7Nw@public.gmane.org>
2016-05-11 13:33 ` Colin Ian King
[not found] ` <5733348D.7010301-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>
2016-05-11 15:22 ` Catalin Marinas
[not found] ` <20160511152249.GI3051-M2fw3Uu6cmfZROr8t4l/smS4ubULX0JqMm0uRHvK7Nw@public.gmane.org>
2016-05-11 15:25 ` Colin Ian King
2016-05-11 14:00 ` Mike Frysinger
[not found] ` <20160511140024.GM26300-UgUKS2FnFs9+urZeOPWqwQ@public.gmane.org>
2016-05-11 15:26 ` Catalin Marinas
[not found] ` <20160511152622.GJ3051-M2fw3Uu6cmfZROr8t4l/smS4ubULX0JqMm0uRHvK7Nw@public.gmane.org>
2016-05-11 16:27 ` Mike Frysinger
[not found] ` <20160511162751.GN26300-UgUKS2FnFs9+urZeOPWqwQ@public.gmane.org>
2016-05-11 16:36 ` Catalin Marinas
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