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Message-ID: Date: Mon, 10 Jul 2023 10:52:34 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 Subject: [PATCH v3 2/8] common: assembly entry point type/size annotations Content-Language: en-US From: Jan Beulich To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , Wei Liu , =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= , Julien Grall , Stefano Stabellini , George Dunlap References: In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: FR2P281CA0125.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:9d::19) To AS8PR04MB8788.eurprd04.prod.outlook.com (2603:10a6:20b:42f::21) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AS8PR04MB8788:EE_|AS4PR04MB9315:EE_ X-MS-Office365-Filtering-Correlation-Id: 74920813-a889-4af5-2e54-08db812301e8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:AS8PR04MB8788.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230028)(366004)(396003)(346002)(39860400002)(136003)(376002)(451199021)(31686004)(478600001)(4326008)(54906003)(2616005)(86362001)(31696002)(36756003)(2906002)(966005)(26005)(6512007)(6506007)(6486002)(186003)(38100700002)(66556008)(5660300002)(316002)(41300700001)(8936002)(66476007)(66946007)(8676002)(6916009)(43740500002)(45980500001);DIR:OUT;SFP:1101; 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Furthermore generating live patches wants items properly annotated. "Borrow" Arm's END() and (remotely) derive other annotation infrastructure from Linux'es, for all architectures to use. Signed-off-by: Jan Beulich [1] https://sourceware.org/git?p=binutils-gdb.git;a=commitdiff;h=591cc9fbbfd6d51131c0f1d4a92e7893edcc7a28 --- v3: New, generalized from earlier x86-only version. LAST() (now LASTARG()) moved to macros.h. --- TBD: What to set CODE_ALIGN to by default? Or should we requires arch-es to define that in all cases? TBD: {CODE,DATA}_ALIGN are byte granular, such that a value of 0 can be specified (in case this has some special meaning on an arch; conceivably it could mean to use some kind of arch default). We may not strictly need that, and hence we could also make these power-of -2 values (using .p2align). Note that we can't use ALIGN() (in place of SYM_ALIGN()) as long as we still have ALIGN. Note further that FUNC()'s etc "algn" parameter is intended to allow for only no or a single argument. If we wanted to also make the fill value customizable per call site, the constructs would need re-doing to some degree. --- /dev/null +++ b/xen/include/xen/linkage.h @@ -0,0 +1,56 @@ +#ifndef __LINKAGE_H__ +#define __LINKAGE_H__ + +#ifdef __ASSEMBLY__ + +#include + +#ifndef CODE_ALIGN +# define CODE_ALIGN ?? +#endif +#ifndef CODE_FILL +# define CODE_FILL ~0 +#endif + +#ifndef DATA_ALIGN +# define DATA_ALIGN 0 +#endif +#ifndef DATA_FILL +# define DATA_FILL ~0 +#endif + +#define SYM_ALIGN(algn...) .balign algn + +#define SYM_L_GLOBAL(name) .globl name +#define SYM_L_WEAK(name) .weak name +#define SYM_L_LOCAL(name) /* nothing */ + +#define SYM_T_FUNC STT_FUNC +#define SYM_T_DATA STT_OBJECT +#define SYM_T_NONE STT_NOTYPE + +#define SYM(name, typ, linkage, algn...) \ + .type name, SYM_T_ ## typ; \ + SYM_L_ ## linkage(name); \ + SYM_ALIGN(algn); \ + name: + +#define END(name) .size name, . - name + +#define FUNC(name, algn...) \ + SYM(name, FUNC, GLOBAL, LASTARG(CODE_ALIGN, ## algn), CODE_FILL) +#define LABEL(name, algn...) \ + SYM(name, NONE, GLOBAL, LASTARG(CODE_ALIGN, ## algn), CODE_FILL) +#define DATA(name, algn...) \ + SYM(name, DATA, GLOBAL, LASTARG(DATA_ALIGN, ## algn), DATA_FILL) + +#define FUNC_LOCAL(name, algn...) \ + SYM(name, FUNC, LOCAL, LASTARG(CODE_ALIGN, ## algn), CODE_FILL) +#define LABEL_LOCAL(name, algn...) \ + SYM(name, NONE, LOCAL, LASTARG(CODE_ALIGN, ## algn), CODE_FILL) +#define DATA_LOCAL(name, algn...) \ + SYM(name, DATA, LOCAL, LASTARG(DATA_ALIGN, ## algn), DATA_FILL) + +#endif /* __ASSEMBLY__ */ + +#endif /* __LINKAGE_H__ */ --- a/xen/include/xen/macros.h +++ b/xen/include/xen/macros.h @@ -15,6 +15,15 @@ #define count_args(args...) \ count_args_(., ## args, 8, 7, 6, 5, 4, 3, 2, 1, 0) +#define ARG1_(x, y...) (x) +#define ARG2_(x, y...) ARG1_(y) +#define ARG3_(x, y...) ARG2_(y) +#define ARG4_(x, y...) ARG3_(y) + +#define ARG__(nr) ARG ## nr ## _ +#define ARG_(nr) ARG__(nr) +#define LASTARG(x, y...) ARG_(count_args(x, ## y))(x, ## y) + /* Indirect macros required for expanded argument pasting. */ #define PASTE_(a, b) a ## b #define PASTE(a, b) PASTE_(a, b)