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Re: [PATCH v5 1/8] common: assembly entry point type/size annotations
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 18 Jan 2024 16:48:57 +0100
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>
- Delivery-date: Thu, 18 Jan 2024 15:49:05 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 17.01.2024 18:02, Roger Pau Monné wrote:
> On Mon, Jan 15, 2024 at 03:34:05PM +0100, Jan Beulich wrote:
>> Recent gas versions generate minimalistic Dwarf debug info for items
>> annotated as functions and having their sizes specified [1]. Furthermore
>> generating live patches wants items properly annotated. "Borrow" Arm's
>> END() and (remotely) derive other annotation infrastructure from
>> Linux'es, for all architectures to use.
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Thanks.
>> --- /dev/null
>> +++ b/xen/include/xen/linkage.h
>> @@ -0,0 +1,54 @@
>> +#ifndef __LINKAGE_H__
>> +#define __LINKAGE_H__
>> +
>> +#ifdef __ASSEMBLY__
>> +
>> +#include <xen/macros.h>
>> +
>> +/* CODE_ALIGN needs to be specified by every architecture. */
>> +#ifndef CODE_FILL
>> +# define CODE_FILL ~0
>> +#endif
>> +
>> +#ifndef DATA_ALIGN
>> +# define DATA_ALIGN 0
>> +#endif
>> +#ifndef DATA_FILL
>> +# define DATA_FILL ~0
>
> I find the fills a bit odd, compared to what we use now (nops for x86
> IIRC).
Well, these are generic defaults. X86 then overrides CODE_FILL for it
to remain NOP. ~0 is the best I can think of as an arch-agnostic default,
considering the half dozen architectures I know at least a little.
Jan
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