From: Changhee Han <gyulkkajo@xxxxxxxxx> Add notes that caution users when passing arguments to syscall.2. Signed-off-by: Changhee Han <gyulkkajo@xxxxxxxxx> --- man2/syscall.2 | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/man2/syscall.2 b/man2/syscall.2 index 0675943..2c823b6 100644 --- a/man2/syscall.2 +++ b/man2/syscall.2 @@ -79,6 +79,15 @@ and an error code is stored in .BR syscall () first appeared in 4BSD. + +On some architecture arguments should be passed with an appropriate way. +The glibc wrapper function, described in +.BR syscalls (2), +copies arguments to the right registers denpend on the architecture but +.BR syscall (2) +needs arguments following ABI, which its architecture describes, to be passed manually by a user. +For example, on ARM architecture, a long long type of argument is considered to be 8-byte aligned and to be split into two 4-byte arguments. + .SH EXAMPLE .nf #define _GNU_SOURCE -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
