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Re: [PATCH v9 09/10] x86: use / "support" UDB
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 5 Dec 2025 12:40:16 +0000
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- Cc: andrew.cooper3@xxxxxxxxxx, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Fri, 05 Dec 2025 12:40:31 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 05/12/2025 12:01 pm, Andrew Cooper wrote:
> On 24/11/2025 3:01 pm, Jan Beulich wrote:
>> --- a/xen/arch/x86/include/asm/bug.h
>> +++ b/xen/arch/x86/include/asm/bug.h
>> @@ -21,7 +21,7 @@
>>
>> #ifndef __ASSEMBLY__
>>
>> -#define BUG_INSTR "ud2"
>> +#define BUG_INSTR ".byte 0xd6" /* UDB */
>> #define BUG_ASM_CONST "c"
>>
>> #else /* !__ASSEMBLY__ */
>> @@ -37,7 +37,7 @@
>> .error "Invalid BUGFRAME index"
>> .endif
>>
>> - .L\@ud: ud2a
>> + .L\@ud: .byte 0xd6 /* UDB */
P.S. Presumably binutils is going to learn a udb mnemonic at some
point? Can we include a version number in the comment?
I'm trying to organise such comments everywhere so it's less effort to
figure out when we can drop it in the future.
~Andrew
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