[Extending the CC for some other input. Changhee Han added the text
that you are asking about; Mike F has done a lot of other work on the
page. Perhaps they can comment.]
On 5 March 2017 at 09:08, Victor Khimenko <khim@xxxxxxxxxx> wrote:
> syscall(2) example includes the following snippet which explains how to
> call readahead on ARM:
>
> syscall(SYS_readahead, fd, 0,
> (unsigned int) (offset >> 32),
> (unsigned int) (offset & 0xFFFFFFFF),
> count);
>
> But ARM EABI specifies that "A double-word sized type is passed in two
> consecutive registers (e.g., r0 and r1, or r2 and r3). The content of
> the registers is as if the value had been loaded from memory representation
> with a single LDM instruction."
>
> This would imply that arguments are swapped around in the man page, no?
So, I'm taking it that you mean the call should look like this:
syscall(SYS_readahead, fd, 0,
(unsigned int) (offset & 0xFFFFFFFF),
(unsigned int) (offset >> 32),
count);
Is that what you mean?
> I've tried to experiement and with ftruncate, at least, it works like
> this...
Sounds plausible. I'm hoping that Mike or Changhee Han might comment.
Cheers,
Michael
> --
> 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
--
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
--
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
