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X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: FKDmGNCpAhMMBJIElZODKnqEGhXUphqFYwp27vZRvegqdApL4q1gGoNKcLpMEITOhDMkxZoRu6HLk3yWdzFM1g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW6PR10MB7637 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-01-19_12,2024-01-19_02,2023-05-22_02 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 phishscore=0 bulkscore=0 malwarescore=0 spamscore=0 suspectscore=0 mlxlogscore=999 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2401200004 X-Proofpoint-GUID: t0o_VaGsalnVjYjIO1q_GcOnRBu-BtbK X-Proofpoint-ORIG-GUID: t0o_VaGsalnVjYjIO1q_GcOnRBu-BtbK X-Spam-Status: No, score=-6.8 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_MSPIKE_H5,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_NONE,TXREP,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On 1/11/24 06:05, Jan Beulich wrote: > On 11.01.2024 14:27, H.J. Lu wrote: >> On Thu, Jan 11, 2024 at 12:05 AM Jan Beulich wrote: >>> >>> On 11.01.2024 08:59, Kong, Lingling wrote: >>>> >>>> >>>>> -----Original Message----- >>>>> From: Jan Beulich >>>>> Sent: Thursday, January 11, 2024 3:43 PM >>>>> To: Kong, Lingling >>>>> Cc: binutils@sourceware.org; Indu Bhagat ; Cui, Lili >>>>> ; H.J. Lu ; Hu, Lin1 >>>>> >>>>> Subject: Re: [PATCH] opcodes: i386: fix dw2_regnum data type in reg_entry >>>>> >>>>> On 11.01.2024 02:35, Kong, Lingling wrote: >>>>>> >>>>>> >>>>>>> -----Original Message----- >>>>>>> From: Jan Beulich >>>>>>> Sent: Tuesday, January 9, 2024 4:25 PM >>>>>>> To: Indu Bhagat ; Cui, Lili >>>>>>> ; H.J. Lu ; Kong, Lingling >>>>>>> ; Hu, Lin1 >>>>>>> Cc: binutils@sourceware.org >>>>>>> Subject: Re: [PATCH] opcodes: i386: fix dw2_regnum data type in >>>>>>> reg_entry >>>>>>> >>>>>>> On 09.01.2024 02:12, Indu Bhagat wrote: >>>>>>>> The DWARF register numbers for the APX EGRPs start with 130. The >>>>>>>> data type holding the same currently is signed char. >>>>>>>> >>>>>>>> ChangeLog: >>>>>>>> * opcodes/i386-opc.h (reg_entry): Bump to signed short. >>>>>>> >>>>>>> So yes, something needs doing. But there are further questions to be >>>>>>> raised to the original authors: Was the code tested at all in this >>>>>>> regard? Why do numbers start at 130, when according to i386-reg.tbl >>>>>>> 128 and 129 are unused (and would hence be more natural to [also] use)? >>>>>> >>>>>> This is because for some historical reasons, some numbers(126-129) have been >>>>> agreed to be reserved. >>>>>> Details can be found in https://groups.google.com/g/x86-64- >>>>> abi/c/GS8LZf5nQFk. >>>>> >>>>> I'm sorry, there are no details there. There's merely mention of these four being >>>>> reserved, without supplying any reason (historical or not). >>>> >>>> Sorry, you could see https://gitlab.com/x86-psABIs/x86-64-ABI/-/commit/6207f9a2c0645f20a7ec591a09e4c382b1675784 >>>> There are reserved for Intel MPX (Memory Protection Extensions) provides 4 128-bit wide bound registers (reg{bnd0} - reg{bnd3}). >>> >>> Then why aren't these marked that way? The commit introducing them to >>> opcodes used Dw2Inval, and it was never changed from that (i.e. there >>> wasn't even deliberate undoing with respective justification). >> >> Leave them as reserved. We have plenty. > > Hmm, the latter sentence doesn't fir what I meant: Why does / did > i386-reg.tbl not / never have those numbers? I could have seen that > they were there and then possibly have been purged, but even then > I would expect there a comment to have been left. So minimally what > I'd like to see / do is to add such comments. > Is the patch (opcodes: i386: fix dw2_regnum data type in reg_entry) OK to commit now ? Thanks Indu