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Fri, 21 Jun 2019 15:39:27 +0000 Received: from CY4PR1201MB0120.namprd12.prod.outlook.com ([fe80::d536:9377:4e1c:75ad]) by CY4PR1201MB0120.namprd12.prod.outlook.com ([fe80::d536:9377:4e1c:75ad%4]) with mapi id 15.20.1987.014; Fri, 21 Jun 2019 15:39:27 +0000 From: Alexey Brodkin To: Vineet Gupta CC: "linux-arch@vger.kernel.org" , Ard Biesheuvel , Peter Zijlstra , "linux-kernel@vger.kernel.org" , Jason Baron , Paolo Bonzini , "linux-snps-arc@lists.infradead.org" , Eugeniy Paltsev Subject: RE: [PATCH] ARC: ARCv2: jump label: implement jump label patching Thread-Topic: [PATCH] ARC: ARCv2: jump label: implement jump label patching Thread-Index: AQHVItAEofkbV+NXXEuPQB3Di+rJQKakNJEAgADZNACAATpIEA== Date: Fri, 21 Jun 2019 15:39:27 +0000 Message-ID: References: <20190614164049.31626-1-Eugeniy.Paltsev@synopsys.com> <20190619081227.GL3419@hirez.programming.kicks-ass.net> <20190620075224.GT3419@hirez.programming.kicks-ass.net> <9192bd26-5f34-dcbf-8552-2f474866a31e@synopsys.com> In-Reply-To: <9192bd26-5f34-dcbf-8552-2f474866a31e@synopsys.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=abrodkin@synopsys.com; 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received-spf: None (protection.outlook.com: synopsys.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: YRzWRAhD8HI6vlD80FWP/P9AVgehMaKOJC4a4Z2B+sXae6mufMVCvcE58LzAs1EnRQdAjquzN79VPYa4nTrkLOjjpQ+g1fNKFpiOW38P9oXd4TawI6t0Ulo2dTDVG9fYmHIg56TLqsLUHi+RlHvAeei9NGzfzOWFyaLq4Imlm9g5GmMgFY1133y/rwtHPmywQX51erlcbERjrxZR/3nUbA7rN8JaBvA0pRLMvOW0JfZPi/CBoaBLfJb5Z7N+AnbjnMhF+YZahIdBzK722V9+rAE8/apRSVlN3NtxO2aY/YPIB9hedDdAunMAmnIY9j+QbA0F1Bq33oPA1WK/A+to0Pm51z1XgKmSfk4hV5jlJyHI6VgeW1jQWYyhFKqaUM7+/Zk+jnUAMckSbdX0+DLVcNGtkCPw6GN6FQfE5jLFWY8= Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: d51d80cd-b358-4c8c-7259-08d6f65ea506 X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Jun 2019 15:39:27.4584 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: c33c9f88-1eb7-4099-9700-16013fd9e8aa X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: abrodkin@synopsys.com X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR1201MB0184 X-OriginatorOrg: synopsys.com Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Vineet, > -----Original Message----- > From: linux-snps-arc On Beha= lf Of Vineet Gupta > Sent: Thursday, June 20, 2019 11:50 PM > To: Peter Zijlstra > Cc: linux-arch@vger.kernel.org; Ard Biesheuvel ; Alexey Brodkin > ; linux-kernel@vger.kernel.org; Jason Baron ; Paolo Bonzini > ; linux-snps-arc@lists.infradead.org; Eugeniy Paltse= v > > Subject: Re: [PATCH] ARC: ARCv2: jump label: implement jump label patchin= g [snip] > Insn encoding is always middl eendina - irrespective of endianness. Apparently only in little-endian mode instructions are encoded as middle-en= dian, see: -------------->8------------- # cat endian.S .global myfunc myfunc: mov r0, r1 -------------->8------------- Little-endian: -------------->8------------- # arc-linux-gcc -c -mcpu=3Darchs endian.S -EL # arc-linux-objdump -d endian.o endian.o: file format elf32-littlearc Disassembly of section .text: 00000000 : 0: 200a 0040 mov r0,r1 # arc-linux-readelf -x .text endian.o Hex dump of section '.text': 0x00000000 0a204000 . @. -------------->8------------- Big-endian: -------------->8------------- # arc-linux-gcc -c -mcpu=3Darchs endian.S -EB # arc-linux-objdump -d endian.o endian.o: file format elf32-bigarc Disassembly of section .text: 00000000 : 0: 200a 0040 mov r0,r1 # arc-linux-readelf -x .text endian.o Hex dump of section '.text': 0x00000000 200a0040 ..@ -------------->8------------- -Alexey