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Wed, 03 May 2023 04:43:32 -0700 (PDT) Received: from [10.230.42.27] ([192.19.152.250]) by smtp.gmail.com with ESMTPSA id k23-20020a05600c0b5700b003ef5bb63f13sm1682291wmr.10.2023.05.03.04.43.31 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 03 May 2023 04:43:31 -0700 (PDT) Message-ID: Date: Wed, 3 May 2023 13:43:30 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.10.1 From: Arend van Spriel To: kexec@lists.infradead.org References: Cc: Eric Biederman Subject: Re: 64-bit kernels and 32-bit user-space In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230503_044335_280594_18C5BED4 X-CRM114-Status: GOOD ( 14.49 ) X-Mailman-Approved-At: Wed, 03 May 2023 10:39:08 -0700 X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============1486312887857488538==" Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org --===============1486312887857488538== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000c1735205fac8901f" --000000000000c1735205fac8901f Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 5/2/2023 2:55 PM, Arend van Spriel wrote: > I am trying to get a kernel crashdump on an embedded router, but it has > 32-bit user-space while the kernel is 64-bit. I tried something simple > and got following: > > # kexec -S > Unsupported machine type: aarch64 Clone the git repo and looked into the kexec message shown above, which is found in the function physical_arch(). It basically does a 'uname -m' and does a lookup in arches array. The problem is that on my platform it tries to lookup aarch64, which is not found. Regarding the lookup I see: for (i = 0; arches[i].machine; ++i) { if (strcmp(utsname.machine, arches[i].machine) == 0) return arches[i].arch; if ((strcmp(arches[i].machine, "arm") == 0) && (strncmp(utsname.machine, arches[i].machine, strlen(arches[i].machine)) == 0)) return arches[i].arch; } So the second if-statement means any utsname matching arm.* regexp, eg. arm64, will return arches[0].arch from arch/arm/kexec-arm.c, ie. KEXEC_ARCH_ARM, right? So can I conclude that 32-bit kexec can load and execute a 64-bit kernel? Regards, Arend > Looking in the build directory I only see arch/arm/ folder, but no > arch/arm64. Is this due to 32-bit user-space? Has someone tried kexec in > such an environment? Any pointers would be appreciated. > > Regards, > Arend --000000000000c1735205fac8901f Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQdwYJKoZIhvcNAQcCoIIQaDCCEGQCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg3OMIIFDTCCA/WgAwIBAgIQeEqpED+lv77edQixNJMdADANBgkqhkiG9w0BAQsFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE AxMKR2xvYmFsU2lnbjAeFw0yMDA5MTYwMDAwMDBaFw0yODA5MTYwMDAwMDBaMFsxCzAJBgNVBAYT AkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMTEwLwYDVQQDEyhHbG9iYWxTaWduIEdDQyBS MyBQZXJzb25hbFNpZ24gMiBDQSAyMDIwMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA vbCmXCcsbZ/a0fRIQMBxp4gJnnyeneFYpEtNydrZZ+GeKSMdHiDgXD1UnRSIudKo+moQ6YlCOu4t rVWO/EiXfYnK7zeop26ry1RpKtogB7/O115zultAz64ydQYLe+a1e/czkALg3sgTcOOcFZTXk38e aqsXsipoX1vsNurqPtnC27TWsA7pk4uKXscFjkeUE8JZu9BDKaswZygxBOPBQBwrA5+20Wxlk6k1 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