From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yb1-xb33.google.com (mail-yb1-xb33.google.com [IPv6:2607:f8b0:4864:20::b33]) by sourceware.org (Postfix) with ESMTPS id 584B6385840D for ; Wed, 24 Apr 2024 14:22:55 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 584B6385840D Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=gmail.com ARC-Filter: OpenARC Filter v1.0.0 sourceware.org 584B6385840D Authentication-Results: server2.sourceware.org; arc=none smtp.remote-ip=2607:f8b0:4864:20::b33 ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1713968578; cv=none; b=WGdb5QU0982YT4eWnOjeoSbvfRUFaT2wUTi51KtHmFvoPhwP7NtIU6DMg4Qmngan4ijMHSgwRAI1kSsSegXb7f8V2dkXOTmnEDOmG/5S/MqCNyiVOsPlKkM/U+jydMpQH1qP8i5IMMaj58NioPx/QW4eI33LRoW98LbS/Q486x0= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1713968578; c=relaxed/simple; bh=Tr+0zJkDnbgb0ucukbv45aR096nYoNNkQlVMPTrw/u0=; h=DKIM-Signature:MIME-Version:From:Date:Message-ID:Subject:To; b=oNB07c8xcz8IOJrpFfQH4YkaFcyiehQ4yWHE6smovViQGgoP39kd6a7O6QGe3E9+eZeACa4DUXxaLO88V03iKw7jNHZKGKfdR5nn9lK69ySo+2hGyQbo8uSmkCaDvzvXCw33n7hz6wIgznuohnQxbN13wlMy8e3cqIXRfPpBFfw= ARC-Authentication-Results: i=1; server2.sourceware.org Received: by mail-yb1-xb33.google.com with SMTP id 3f1490d57ef6-ddda842c399so6827410276.3 for ; Wed, 24 Apr 2024 07:22:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1713968574; x=1714573374; darn=sourceware.org; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:from:to:cc:subject:date :message-id:reply-to; bh=UNMPbzyqoKDazrzruT9Oy1dW9ULSGcGZVeoVn8FiZeo=; b=B3pK2xfQ0E0K5FzL45APn9zjgawslNt3OC/qnpttWXOettE29g8btBKEXTe2wqNMfa GiOHgiD/yiVDu32FbQIO9UAzLbHxUF1AXebLwSgD/wEngZ8bfwCejBm1egiE1diZ9kHp K6nMyBj8LDy1G3aMRBqMhCZXEY6GDgD62gt9U4snNanZY5O+3vfgUClN3/4h7dumIHy6 +7/gej2roaVEPkDXPUcuQpjE4Ap+LBi5+bWLMcA2mEua9Va/vIVrIJfKbpueOwCO7pe9 G9hlYGvX1cHL6eRmrXOaAszjmUEIjOR9qPf7FZuNdYM1BCQG8U5Eyo4RC+nkeLuWWkRQ xdkw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1713968574; x=1714573374; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=UNMPbzyqoKDazrzruT9Oy1dW9ULSGcGZVeoVn8FiZeo=; b=SJZqhelpiqTfpxWMXBYxTzvw2jN9Ck79AeoeJrJWXXqTAC6uCexDFYMmkhGidnfsEu F/J77Fp/z3V3iImj8d5noMo4sNJ0YHZh0ZrGOJ059y7aRCC1Geq3bQX+2x9W0GbZF/mX fXDJl+WSI0aLyPSAmuT2bDCltOqoO3nKpDWUV6Kv93wWaL6gZdyxOeNC0nuV4kt+d+ym AOOzl/PrcmxYE/xYqzj82z9/AVPz6LAwsWi0fzgQ85kfwygXOYilwLJFankW28tc74oa QhPjw02/U/v/fKSjKe7l9GerhdDRJ083en1S9ovam9CMUjzfxZjCjkSkycFhD6fZQyRJ IPaw== X-Forwarded-Encrypted: i=1; AJvYcCXT+I+vpWsMVL+tvLmU4DAE7zCcxQ3YIedUYKz3fgo+oEB/t0rIpype4TbnX+0GcluOCGIHo0N6u4gRrI6M/Lg7bUd732aEOw== X-Gm-Message-State: AOJu0Yxywsl9CeZAxw88y01pbic6seCQuYQUfKL08Orb7AAbnL2C/rfo wALsBqskwd9PVE7tLUwI3iTrBuNKdbYQoisIcQ0z6Xsn+lebns9lMK/V3sL2JbwmiTEmb9EnM1O xxsz7iSxabUV8H0c0geAuFwXRJuU= X-Google-Smtp-Source: AGHT+IFnnmHrf6g1Qgqurw4Z8HypVoTTmOSA9O7Hdkb3GXtO3Oa1JkmM+MO/yGfISs3DqPilCGE2eAeabLUdCfo15U0= X-Received: by 2002:a25:c748:0:b0:dc7:48f8:1d07 with SMTP id w69-20020a25c748000000b00dc748f81d07mr3229596ybe.21.1713968574139; Wed, 24 Apr 2024 07:22:54 -0700 (PDT) MIME-Version: 1.0 References: <3f373229-b7cf-4229-9591-922838577652@redhat.com> In-Reply-To: <3f373229-b7cf-4229-9591-922838577652@redhat.com> From: "H.J. Lu" Date: Wed, 24 Apr 2024 07:22:18 -0700 Message-ID: Subject: Re: RFC: syntax for a section ordering file To: Nick Clifton Cc: Fangrui Song , Binutils Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Spam-Status: No, score=-3012.9 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On Wed, Apr 24, 2024 at 6:58=E2=80=AFAM Nick Clifton wro= te: > > Hi H.J. Hi Fangrui, > > Is there a defined syntax for the contents of a section ordering file = ? > IE one passed to the linker via the --section-ordering=3D option ? > > I am attempting to take H.J.'s bfd linker text section ordering file Thank you for doing it. > patch and extend it to cover other sections. In doing so, I need to > be sure that I have the syntax right. > > To my mind if the section ordering file contains the following: > > # A comment > .text.hot .text.cold,.text.warm > .data.big > .data.small > .text.foo* > > Then this should be roughly equivalent to: > > SECTIONS > { > .text : { > *(.text.hot) > *(.text.cold) > *(.text.warm) > *(.text.foo*) > *(.text) > } > .data : { > *(.data.big) > *(.data.small) > *(.data) > } > } This looks correct to me. > So all of the .text. entries in the section ordering > file are placed at the start of the output .text section (even > if some of them occur after entries for other output sections) > and all of the .data. entries are placed at the start > of the .data section. > > This will require co-operation from the linker script to have > the "INCLUDE config.section-ordering-file" statements at the > correct places, but I think that it could work. > > But obviously I want the option to be compatible with GOLD and > LLD and I could not find any clear definitions or examples of > the syntax used. lld doesn't support --section-ordering-file. I tried different syntaxes with gold. Gold doesn't complain about any inputs. But only .text.yyy .text.bar .text.xxx .text.foo works and it doesn't support wildcards. I think wildcards are useful. -- H.J.