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[37.24.206.209]) by smtp.gmail.com with ESMTPSA id ay15-20020a05600c1e0f00b0040e3dd9f572sm911170wmb.20.2024.01.11.00.05.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 11 Jan 2024 00:05:17 -0800 (PST) Message-ID: <341075aa-2e7b-4043-8239-fc912149b080@suse.com> Date: Thu, 11 Jan 2024 09:05:16 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] opcodes: i386: fix dw2_regnum data type in reg_entry Content-Language: en-US To: "Kong, Lingling" , "H.J. Lu" Cc: "binutils@sourceware.org" , Indu Bhagat , "Cui, Lili" , "Hu, Lin1" References: <20240109011229.4191052-1-indu.bhagat@oracle.com> <1cf65034-171c-44e7-bb7d-022f35451cb0@suse.com> From: Jan Beulich Autocrypt: addr=jbeulich@suse.com; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-3025.9 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,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 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). Jan