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Re: [Xen-devel] [PATCH v8 01/28] linkage: new macros for assembler symbols
- To: Borislav Petkov <bp@xxxxxxxxx>
- From: Jiri Slaby <jslaby@xxxxxxx>
- Date: Thu, 29 Aug 2019 12:48:24 +0200
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- Cc: linux-arch@xxxxxxxxxxxxxxx, Juergen Gross <jgross@xxxxxxxx>, Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>, jpoimboe@xxxxxxxxxx, Len Brown <len.brown@xxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, linux-pm@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Ingo Molnar <mingo@xxxxxxxxxx>, mingo@xxxxxxxxxx, Pavel Machek <pavel@xxxxxx>, hpa@xxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, tglx@xxxxxxxxxxxxx, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 29 Aug 2019 10:48:44 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 12. 08. 19, 19:06, Borislav Petkov wrote:
>> + Again, every ``SYM_CODE_START*`` **shall** be coupled by ``SYM_CODE_END``.
>
> Btw, this coupling: I haven't gone through the whole patchset but do we
> have automatic checking which makes sure a starting macro is coupled
> with the correct ending macro?
I do, but it's not part of this series. It's a pinch of link-time magic,
but it works reliably (see e.g. 1cbec37b3f9c). I will post it if/after
this gets merged. There were other approaches proposed in the past too
-- using objtool for that (not implemented).
>> +Overriding Macros
>> +~~~~~~~~~~~~~~~~~
>> +Architecture can also override any of the macros in their own
>
> "Other architectures... "
Not only "other", x86 can override the types if need be too.
>> +``asm/linkage.h``, including macros specifying the type of a symbol
>> +(``SYM_T_FUNC``, ``SYM_T_OBJECT``, and ``SYM_T_NONE``). As every macro
>> +described in this file is surrounded by ``#ifdef`` + ``#endif``, it is
>> enough
>> +to define the macros differently in the aforementioned
>> architecture-dependent
>> +header.
thanks,
--
js
suse labs
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