From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Mon, 05 Jan 2026 15:08:35 +0100 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1vclG7-001Xrw-1k for lore@lore.pengutronix.de; Mon, 05 Jan 2026 15:08:35 +0100 Received: from bombadil.infradead.org ([2607:7c80:54:3::133]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1vclG6-0001ZI-Qv for lore@pengutronix.de; Mon, 05 Jan 2026 15:08:35 +0100 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Asnoqtnh43dGj4EiUSpyr8WRLzoQfyD2NDfn9dY+IwE=; b=JFwtSmm8b6QMauQNxIT3W4txm5 OvQiXj1b/YPSazqD+TTlXMYQWb6mjh2ES8ADAsfPjg8yarTQbazvF/VqTZZHaGJgcow9FEme1k1ml yWcagjCpXDxdqbly7zU4MEYwfbWHKfIHZjOLRyoPHg9AYXmWO0ZTqklFOcrr/XAyb7SYtz+8j+855 Wu/3uw+Avc7Ukl9xZCTW5mRZXpOUWRE93ekxULM0e3cZ0WRo5UepUM/IbV4Nq05w41I2mWW0FMu0N H6CUQchoiOQUm5hvK8PBnfhdZXpt6CtEUtMLa1GunxY8cFUNWVb9ww+z9SxET8fe95SCiQuEVrpEi 6DiC8Gzw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vclFg-0000000BWDs-2HpN; Mon, 05 Jan 2026 14:08:08 +0000 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vclFd-0000000BWDK-0fKN for barebox@lists.infradead.org; Mon, 05 Jan 2026 14:08:06 +0000 Received: from ptz.office.stw.pengutronix.de ([2a0a:edc0:0:900:1d::77] helo=[127.0.0.1]) by metis.whiteo.stw.pengutronix.de with esmtp (Exim 4.92) (envelope-from ) id 1vclFb-0001U0-Jo; Mon, 05 Jan 2026 15:08:03 +0100 Message-ID: <75be7502-faa6-4528-b438-feb58ba16ab7@pengutronix.de> Date: Mon, 5 Jan 2026 15:08:03 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird To: Sascha Hauer , BAREBOX Cc: "Claude Sonnet 4.5" References: <20260105-pbl-load-elf-v1-0-e97853f98232@pengutronix.de> From: Ahmad Fatoum Content-Language: en-US, de-DE, de-BE In-Reply-To: <20260105-pbl-load-elf-v1-0-e97853f98232@pengutronix.de> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260105_060805_201664_F40E77C8 X-CRM114-Status: GOOD ( 25.51 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.whiteo.stw.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-4.0 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: Re: [PATCH 00/19] PBL: Add PBL ELF loading support with dynamic relocations X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.whiteo.stw.pengutronix.de) Hi, On 1/5/26 12:26 PM, Sascha Hauer wrote: > Until now we linked the raw barebox proper binary into the PBL which > comes with a number of disadvantages. We rely on self-modifying code > to in barebox proper (relocate_to_current_adr()) and have no initialized > bss segment (setup_c()). Also we can only mark the .text and .rodata as > readonly during runtime of barebox proper. > > This series overcomes this by linking a ELF image into the PBL. This > image is properly layed out, linked and initialized in the PBL. With > this barebox proper has a proper C environment and text/rodata > protection from the start. > > As a bonus this series also adds initial MMU support for RISCV, also > based on loading the ELF image and configuring the MMU from the PBL. > > This series also marks my start into AI assisted programming as you can > see in the Co-Authored-By: Claude Sonnet 4.5 > and 🤖 Generated with [Claude Code](https://claude.com/claude-code) > tags. Without it I wouldn't have started this series during my xmas > break, but with it it was actually quite fun to do; it felt like having > a programming team which I just had to delegate new tasks to while > having fun with my family myself ;) Did you do size comparisons to determine how much this series affects binary size? I found that compressing every segment separately resulted in a smaller binary size even after addition of ELF parsing to PBL, but I used a purpose-built ELF loader unlike to what you did here. Cheers, Ahmad > > Co-Authored-By: Claude Sonnet 4.5 > Signed-off-by: Sascha Hauer > --- > Sascha Hauer (19): > elf: Use memcmp to make suitable for PBL > elf: build for PBL as well > elf: add dynamic relocation support > ARM: implement elf_apply_relocations() for ELF relocation support > riscv: implement elf_apply_relocations() for ELF relocation support > elf: implement elf_load_inplace() > elf: create elf_open_binary_into() > Makefile: add barebox.elf build target > PBL: allow to link ELF image into PBL > mmu: add MAP_CACHED_RO mapping type > mmu: introduce pbl_remap_range() > ARM: use relative jumps in exception table > ARM: exceptions: make in-binary exception table const > ARM: linker script: create separate PT_LOAD segments for text, rodata, and data > ARM: link ELF image into PBL > ARM: PBL: setup MMU with proper permissions from ELF segments > riscv: link ELF image into PBL > riscv: linker script: create separate PT_LOAD segments for text, rodata, and data > riscv: add ELF segment-based memory protection with MMU > > Makefile | 16 +- > arch/arm/Kconfig | 2 + > arch/arm/cpu/exceptions_32.S | 54 +++--- > arch/arm/cpu/interrupts_32.c | 41 +++- > arch/arm/cpu/mmu-common.c | 66 +------ > arch/arm/cpu/mmu-common.h | 3 +- > arch/arm/cpu/mmu_32.c | 19 +- > arch/arm/cpu/mmu_64.c | 10 +- > arch/arm/cpu/no-mmu.c | 11 +- > arch/arm/cpu/start.c | 4 - > arch/arm/cpu/uncompress.c | 46 ++++- > arch/arm/include/asm/barebox-arm.h | 4 +- > arch/arm/include/asm/barebox.lds.h | 14 +- > arch/arm/include/asm/elf.h | 11 ++ > arch/arm/include/asm/sections.h | 1 + > arch/arm/lib/pbl.lds.S | 8 +- > arch/arm/lib32/Makefile | 1 + > arch/arm/lib32/barebox.lds.S | 39 ++-- > arch/arm/lib32/elf_reloc.c | 105 ++++++++++ > arch/arm/lib64/Makefile | 1 + > arch/arm/lib64/barebox.lds.S | 31 ++- > arch/arm/lib64/elf_reloc.c | 105 ++++++++++ > arch/riscv/Kconfig | 18 ++ > arch/riscv/Kconfig.socs | 1 - > arch/riscv/boot/start.c | 4 - > arch/riscv/boot/uncompress.c | 41 +++- > arch/riscv/cpu/Makefile | 1 + > arch/riscv/cpu/mmu.c | 386 +++++++++++++++++++++++++++++++++++++ > arch/riscv/cpu/mmu.h | 144 ++++++++++++++ > arch/riscv/include/asm/asm.h | 3 +- > arch/riscv/include/asm/mmu.h | 44 +++++ > arch/riscv/lib/Makefile | 1 + > arch/riscv/lib/barebox.lds.S | 38 ++-- > arch/riscv/lib/elf_reloc.c | 212 ++++++++++++++++++++ > common/Makefile | 2 +- > common/elf.c | 367 +++++++++++++++++++++++++++++++++-- > images/Makefile | 18 +- > images/piggy.S | 4 + > include/elf.h | 62 ++++++ > include/mmu.h | 12 +- > include/pbl/mmu.h | 29 +++ > lib/Makefile | 1 + > lib/elf_reloc.c | 15 ++ > pbl/Kconfig | 8 + > pbl/Makefile | 1 + > pbl/mmu.c | 111 +++++++++++ > scripts/prelink-riscv.inc | 9 +- > 47 files changed, 1922 insertions(+), 202 deletions(-) > --- > base-commit: e2d7e032281158b54541392b4d8108de204137a1 > change-id: 20251227-pbl-load-elf-cb4cb0ceb7d8 > > Best regards, -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |