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Re: [PATCH] xen/include: move definition of ASM_INT() to xen/linkage.h
- To: Juergen Gross <jgross@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 3 Apr 2024 14:51:08 +0200
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 03 Apr 2024 12:51:16 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 03.04.2024 14:03, Juergen Gross wrote:
> ASM_INT() is defined in arch/[arm|x86]/include/asm/asm_defns.h in
> exactly the same way. Instead of replicating this definition for riscv
> and ppc, move it to include/xen/linkage.h, where other arch agnostic
> definitions for assembler code are living already.
And this is why I didn't make a change right away, back when noticing the
duplication: Arch-agnostic really means ...
> --- a/xen/include/xen/linkage.h
> +++ b/xen/include/xen/linkage.h
> @@ -60,6 +60,8 @@
> #define DATA_LOCAL(name, align...) \
> SYM(name, DATA, LOCAL, LASTARG(DATA_ALIGN, ## align), DATA_FILL)
>
> +#define ASM_INT(label, val) DATA(label, 4) .long (val); END(label)
... to avoid .long [1]. There's no arch-independent aspect guaranteeing
that what .long emits matches "unsigned int" as used e.g. in the
declaration of xen_config_data_size. The arch-agnostic directives are
.dc.l and friends. Sadly Clang looks to support this only starting with
version 4.
Nevertheless, seeing that Andrew ack-ed the change already, it's perhaps
good enough for the moment. If an obscure port appeared, the further
abstraction could be taken care of by them.
Jan
[1] Note how in gas doc .long refers to .int, .int says "32-bit", just
to then have a special case of H8/300 emitting 16-bit values. Things
must have been confusing enough for someone to come and add .dc.?.
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