From patchwork Mon Jun 10 19:32:03 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Julien Grall X-Patchwork-Id: 10985369 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0542514BB for ; Mon, 10 Jun 2019 19:34:19 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EAE2E27F17 for ; Mon, 10 Jun 2019 19:34:18 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DEFD8286CD; Mon, 10 Jun 2019 19:34:18 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 717F727F17 for ; Mon, 10 Jun 2019 19:34:18 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1haQ1r-0007dR-Ts; Mon, 10 Jun 2019 19:32:27 +0000 Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1haQ1r-0007dH-AH for xen-devel@lists.xenproject.org; Mon, 10 Jun 2019 19:32:27 +0000 X-Inumbo-ID: 79f136ad-8bb6-11e9-8980-bc764e045a96 Received: from foss.arm.com (unknown [217.140.110.172]) by us1-rack-dfw2.inumbo.com (Halon) with ESMTP id 79f136ad-8bb6-11e9-8980-bc764e045a96; Mon, 10 Jun 2019 19:32:25 +0000 (UTC) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id ACA74346; Mon, 10 Jun 2019 12:32:25 -0700 (PDT) Received: from e108454-lin.cambridge.arm.com (e108454-lin.cambridge.arm.com [10.1.196.50]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C49683F73C; Mon, 10 Jun 2019 12:32:24 -0700 (PDT) From: Julien Grall To: xen-devel@lists.xenproject.org Date: Mon, 10 Jun 2019 20:32:03 +0100 Message-Id: <20190610193215.23704-6-julien.grall@arm.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20190610193215.23704-1-julien.grall@arm.com> References: <20190610193215.23704-1-julien.grall@arm.com> Subject: [Xen-devel] [PATCH 05/17] xen/arm64: head: Introduce print_reg X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: andre.przywara@arm.com, Julien Grall , Stefano Stabellini , andrii_anisov@epam.com, Oleksandr_Tyshchenko@epam.com MIME-Version: 1.0 Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP At the moment, the user should save x30/lr if it cares about it. Follow-up patches will introduce more use of putn in place where lr should be preserved. Furthermore, any user of putn should also move the value to register x0 if it was stored in a different register. For convenience, a new macro is introduced to print a given register. The macro will take care for us to move the value to x0 and also preserve lr. Lastly the new macro is used to replace all the callsite of putn. This will simplify rework/review later on. Note that CurrentEL is now stored in x5 instead of x4 because the latter will be clobbered by the macro print_reg. Signed-off-by: Julien Grall --- xen/arch/arm/arm64/head.S | 29 ++++++++++++++++++++++------- 1 file changed, 22 insertions(+), 7 deletions(-) diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S index 84e26582c4..9142b4a774 100644 --- a/xen/arch/arm/arm64/head.S +++ b/xen/arch/arm/arm64/head.S @@ -90,8 +90,25 @@ bl puts ; \ mov lr, x3 ; \ RODATA_STR(98, _s) + +/* + * Macro to print the value of register \xb + * + * Clobbers x0 - x4 + */ +.macro print_reg xb + mov x4, lr + mov x0, \xb + bl putn + mov lr, x4 +.endm + #else /* CONFIG_EARLY_PRINTK */ #define PRINT(s) + +.macro print_reg xb +.endm + #endif /* !CONFIG_EARLY_PRINTK */ /* Load the physical address of a symbol into xb */ @@ -304,22 +321,20 @@ GLOBAL(init_secondary) #ifdef CONFIG_EARLY_PRINTK ldr x23, =EARLY_UART_BASE_ADDRESS /* x23 := UART base address */ PRINT("- CPU ") - mov x0, x24 - bl putn + print_reg x24 PRINT(" booting -\r\n") #endif common_start: PRINT("- Current EL ") - mrs x4, CurrentEL - mov x0, x4 - bl putn + mrs x5, CurrentEL + print_reg x5 PRINT(" -\r\n") /* Are we in EL2 */ - cmp x4, #PSR_MODE_EL2t - ccmp x4, #PSR_MODE_EL2h, #0x4, ne + cmp x5, #PSR_MODE_EL2t + ccmp x5, #PSR_MODE_EL2h, #0x4, ne b.eq el2 /* Yes */ /* OK, we're boned. */