From: Alexander Lochmann <alexander.lochmann@tu-dortmund.de>
To: David Smith <dsmith@redhat.com>, Josh Stone <jistone@redhat.com>,
systemtap@sourceware.org
Subject: Re: SystemTap for Android - patchset
Date: Fri, 08 Jul 2016 05:38:00 -0000 [thread overview]
Message-ID: <577F3C55.6050508@tu-dortmund.de> (raw)
In-Reply-To: <27ef4d79-281d-f7cc-2e98-433edc2256d8@redhat.com>
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On 07.07.2016 23:14, David Smith wrote:
> On 07/07/2016 03:52 PM, Alexander Lochmann wrote:
>> On 07.07.2016 19:39, David Smith wrote:
>>> OK, I'll believe you. However, your fix above still isn't correct. The
>>> whole point of autoconf-asm-syscall.c is to test if asm/syscall.h exists
>>> and is usable. If so, STAPCONF_ASM_SYSCALL_H will get defined. If
>>> autoconf-asm-syscall.c doesn't compile correctly, then
>>> STAPCONF_ASM_SYSCALL_H won't be defined.
>>>
>>> What needs to happen next here is for you to back out this change,
>>> recompile systemtap, then try to compile a few systemtap scripts. We'll
>>> need to see the errors to know what to fix. I'd guess we'll need to test
>>> STAPCONF_ASM_SYSCALL_H in some more places.
>> Ok. Here is the error message I get:
>> /tmp/stapE7HrAi/alexv9_src.c: In function
>> 'function___global__stp_syscall_nr__overload_0':
>> /tmp/stapE7HrAi/alexv9_src.c:7975:2: error: implicit declaration of
>> function '_stp_syscall_get_nr'
>>
>> I tested three scripts so far. All of them do not compile due to the
>> above error.
>> Do you need one of the scripts?
>
> Nope.
>
> One of the reasons we include <asm/syscall.h> is to get the kernel's
> syscall_get_nr() macros. If the kernel doesn't have a <asm/syscall.h>,
> we define our own versions of syscall_get_nr() in runtime/syscall.h. The
> arm platform already has our custom version of that macro in
> runtime/syscall.h.
>
> I'd guess we aren't including systemtap's runtime/syscall.h in the
> proper place. Here's a patch that might work:
>
> ====
> diff --git a/tapset/linux/aux_syscalls.stp b/tapset/linux/aux_syscalls.stp
> index 110e6e9..2cc3cea 100644
> --- a/tapset/linux/aux_syscalls.stp
> +++ b/tapset/linux/aux_syscalls.stp
> @@ -43,6 +43,8 @@
> // Get _stp_val_array and _stp_lookup_* definitions.
> #include "linux/syscalls-common.h"
>
> +#include "syscall.h"
> +
> static void
> _stp_lookup_str2(const _stp_val_array * const array, long val, char *ptr,
> int len, int base)
> ====
>
Yes. Works. :) At least for the four scripts I tested.
- Alex
--
Technische Universität Dortmund
Alexander Lochmann PGP key: 0xBC3EF6FD
Otto-Hahn-Str. 16 phone: +49.231.7556141
D-44227 Dortmund fax: +49.231.7556116
http://ess.cs.tu-dortmund.de/Staff/al
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next prev parent reply other threads:[~2016-07-08 5:38 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <f01a1f27-3cdb-61a4-cbdb-7bffd1032c8e@tu-dortmund.de>
2016-07-01 16:15 ` Alexander Lochmann
2016-07-01 16:56 ` David Smith
2016-07-01 17:47 ` Josh Stone
2016-07-06 12:29 ` Alexander Lochmann
2016-07-06 16:42 ` Frank Ch. Eigler
2016-07-06 20:05 ` Alexander Lochmann
2016-07-06 20:15 ` Frank Ch. Eigler
2016-07-06 20:27 ` Alexander Lochmann
2016-07-07 16:00 ` David Smith
2016-07-07 16:06 ` David Smith
2016-07-07 16:23 ` Alexander Lochmann
2016-07-07 17:39 ` David Smith
2016-07-07 20:51 ` Alexander Lochmann
2016-07-07 21:14 ` David Smith
2016-07-08 5:38 ` Alexander Lochmann [this message]
2016-07-08 15:31 ` David Smith
2016-07-07 18:47 ` David Smith
2016-07-07 19:01 ` Alexander Lochmann
2016-07-07 19:24 ` David Smith
2016-07-07 19:32 ` Alexander Lochmann
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