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Thu, 14 May 2020 13:09:51 +0000 Received: from CY4PR1201MB0136.namprd12.prod.outlook.com ([fe80::8d22:7d25:8892:a09]) by CY4PR1201MB0136.namprd12.prod.outlook.com ([fe80::8d22:7d25:8892:a09%8]) with mapi id 15.20.3000.022; Thu, 14 May 2020 13:09:51 +0000 From: Eugeniy Paltsev To: Claudiu Zissulescu Ianculescu CC: "linux-kernel@vger.kernel.org" , "linux-snps-arc@lists.infradead.org" , Vineet Gupta , Alexey Brodkin Subject: Re: [RFC] ARC: initial ftrace support Thread-Topic: [RFC] ARC: initial ftrace support Thread-Index: AQHWBFAKr4qHDPVDOEWWdR2Z3ElRlKhcrJAAgAhjooCAAHODgIAAZgeAgEHt42Y= Date: Thu, 14 May 2020 13:09:51 +0000 Message-ID: References: <20200327155355.18668-1-Eugeniy.Paltsev@synopsys.com> <20200327131020.79e68313@gandalf.local.home> , In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: gmail.com; dkim=none (message not signed) header.d=none;gmail.com; dmarc=none action=none header.from=synopsys.com; x-originating-ip: [5.18.247.93] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: fabca5f6-1469-48cd-876f-08d7f808167a x-ms-traffictypediagnostic: CY4PR1201MB0053: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:6108; 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x-ms-exchange-antispam-messagedata: oY/aF912f9T8YMYzMteo6WUKRFUxleLFj+01ohpNUrPk5ZCyhYwyNREE3UJbpoi78u4kgQhCH8iNaExgSkfdrEnniJJfmn9Yh7UB5V9OSdHg/p16UIVQuEUZPtIoXKswwIloGujFr0WaqS51adnT1XAyZUj8hos+rNnAaxIG75jquvE4v6x1xrGMYB0QVbR3vGAr0Lq3L9KN/vOn640zRQLi65RF1jXDH9+0APY9006Dvhb3l5rMtMzh0AA0sC2Fdw84wesk6IilaF3sST+eJyDzDD4M2D+dOXDI+2U/veF7YbrjrMkCws6kizGNw3U/5aTQKzOSogcmDcVS6KrBBq8o+EUqOd2gYJUULTgGYS8MN7DDEB5QsbgDZGWISZ9mBG8+4bwPK6ywO+StsW8ymi+oCnaiyYnRtXNocswcik6kM0eV0RrUNOL03c0ow7mJfKcXKmWLcon4b1ZS4jl8J/F3aFJQGgBGo1GkI7CVrWk= Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: fabca5f6-1469-48cd-876f-08d7f808167a X-MS-Exchange-CrossTenant-originalarrivaltime: 14 May 2020 13:09:51.5820 (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: 3BVY9xR7MHrbASwkTfQTIXWoq2XuHggrE9draW8S0dWCC2E/vtGHzNB2KIx32MiB8ISn2bSsrV7L/KabPDz/LA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR1201MB0053 X-OriginatorOrg: synopsys.com Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Claudiu,=0A= ping!=0A= =0A= Is is possible to switch between mcount modes (Linux-style <-> baremetal-st= yle) via command-line options for ARC GCC?=0A= =0A= >From: Alexey Brodkin =0A= >Sent: Thursday, April 2, 2020 17:15=0A= >To: Claudiu Zissulescu Ianculescu=0A= >Cc: linux-kernel@vger.kernel.org; Steven Rostedt; Ingo Molnar; linux-snps-= arc@lists.infradead.org; Eugeniy Paltsev; Vineet Gupta=0A= >Subject: RE: [RFC] ARC: initial ftrace support=0A= >=0A= > Hi Claus,=0A= >=0A= >> -----Original Message-----=0A= >> From: linux-snps-arc On Beh= alf Of Claudiu Zissulescu=0A= >> Ianculescu=0A= >> Sent: Thursday, April 2, 2020 11:10 AM=0A= >> To: Vineet Gupta =0A= >> Cc: Alexey Brodkin ; linux-kernel@vger.kernel.org= ; Steven Rostedt=0A= >> ; Ingo Molnar ; linux-snps-arc@li= sts.infradead.org; Eugeniy=0A= >> Paltsev =0A= >> Subject: Re: [RFC] ARC: initial ftrace support=0A= >>=0A= >> Hi,=0A= >>=0A= >> ARC-gcc has two modes to call the mcount routines. When using elf32=0A= >> configuration, the toolchain is set to use newlib mcount. When=0A= >> configured for linux, gcc toolchain is using a library call to _mcall=0A= >> (single underscore) having blink as input argument.=0A= >> So, using the proper linux toolchain, your patch should work.=0A= >=0A= >=0A= > Is there a chance to switch to Linux-style mcount in Elf32 toolchain with= a command-line=0A= > option?=0A= >=0A= > Otherwise I guess we'll need to implement some warning which explicitly s= ays why Elf32=0A= > toolchain is not usable for building the Linux kernel... at least in case= with ftrace enabled.=0A= >=0A= >-Alexey=0A=