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[209.132.180.67]) by mx.google.com with ESMTP id g21si8187459otn.267.2020.03.10.01.14.07; Tue, 10 Mar 2020 01:14:19 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726390AbgCJIMr (ORCPT + 99 others); Tue, 10 Mar 2020 04:12:47 -0400 Received: from zimbra2.kalray.eu ([92.103.151.219]:50818 "EHLO zimbra2.kalray.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725919AbgCJIMq (ORCPT ); Tue, 10 Mar 2020 04:12:46 -0400 Received: from localhost (localhost [127.0.0.1]) by zimbra2.kalray.eu (Postfix) with ESMTP id 10EAA27E0589; Tue, 10 Mar 2020 09:12:45 +0100 (CET) Received: from zimbra2.kalray.eu ([127.0.0.1]) by localhost (zimbra2.kalray.eu [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id suHw1Lkpx2r5; Tue, 10 Mar 2020 09:12:44 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by zimbra2.kalray.eu (Postfix) with ESMTP id 53AB727E05D7; Tue, 10 Mar 2020 09:12:44 +0100 (CET) X-Virus-Scanned: amavisd-new at zimbra2.kalray.eu Received: from zimbra2.kalray.eu ([127.0.0.1]) by localhost (zimbra2.kalray.eu [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id nSuIx9HZ4Lhp; Tue, 10 Mar 2020 09:12:44 +0100 (CET) Received: from zimbra2.kalray.eu (localhost [127.0.0.1]) by zimbra2.kalray.eu (Postfix) with ESMTP id 35E2027E0589; Tue, 10 Mar 2020 09:12:44 +0100 (CET) Date: Tue, 10 Mar 2020 09:12:44 +0100 (CET) From: =?utf-8?Q?Cl=C3=A9ment?= Leger To: Bjorn Andersson Cc: Mathieu Poirier , Ohad Ben-Cohen , Jonathan Corbet , Shawn Guo , Sascha Hauer , linux-remoteproc , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Andy Gross , Patrice Chotard , linux-doc , linux-kernel , linux-arm-kernel , linux-arm-msm , Arnaud Pouliquen , Loic PALLARDY , s-anna Message-ID: <1569234651.9042535.1583827964044.JavaMail.zimbra@kalray.eu> In-Reply-To: <20200309235710.GE14744@builder> References: <20200210162209.23149-1-cleger@kalray.eu> <20200302093902.27849-1-cleger@kalray.eu> <20200302093902.27849-9-cleger@kalray.eu> <20200309203223.GE1399@xps15> <20200309235710.GE14744@builder> Subject: Re: [PATCH v5 8/8] remoteproc: Adapt coredump to generate correct elf type MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Originating-IP: [192.168.40.202] X-Mailer: Zimbra 8.8.15_GA_3895 (ZimbraWebClient - GC75 (Linux)/8.8.15_GA_3895) Thread-Topic: remoteproc: Adapt coredump to generate correct elf type Thread-Index: aSfVDzvI7FHWKtYkTa2dk6v5khxkEA== Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Bjorn, ----- On 10 Mar, 2020, at 00:57, Bjorn Andersson bjorn.andersson@linaro.org wrote: > On Mon 09 Mar 13:32 PDT 2020, Mathieu Poirier wrote: > >> On Mon, Mar 02, 2020 at 10:39:02AM +0100, Clement Leger wrote: >> > Now that remoteproc can load an elf64, coredump elf class should be >> > the same as the loaded elf class. In order to do that, add a >> > elf_class field to rproc with default values. If an elf is loaded >> > successfully, this field will be updated with the loaded elf class. >> > Then, the coredump core code has been modified to use the generic elf >> > macro in order to create an elf file with correct class. >> > >> > Signed-off-by: Clement Leger >> > --- >> > drivers/remoteproc/remoteproc_core.c | 67 ++++++++++++++++-------------- >> > drivers/remoteproc/remoteproc_elf_loader.c | 3 ++ >> > include/linux/remoteproc.h | 1 + >> > 3 files changed, 39 insertions(+), 32 deletions(-) >> > >> > diff --git a/drivers/remoteproc/remoteproc_core.c >> > b/drivers/remoteproc/remoteproc_core.c >> > index b932a64a2be2..f923355aa3f9 100644 >> > --- a/drivers/remoteproc/remoteproc_core.c >> > +++ b/drivers/remoteproc/remoteproc_core.c >> > @@ -38,6 +38,7 @@ >> > #include >> > >> > #include "remoteproc_internal.h" >> > +#include "remoteproc_elf_helpers.h" >> > >> > #define HIGH_BITS_MASK 0xFFFFFFFF00000000ULL >> > >> > @@ -1566,20 +1567,21 @@ EXPORT_SYMBOL(rproc_coredump_add_custom_segment); >> > static void rproc_coredump(struct rproc *rproc) >> > { >> > struct rproc_dump_segment *segment; >> > - struct elf32_phdr *phdr; >> > - struct elf32_hdr *ehdr; >> > + void *phdr; >> > + void *ehdr; >> > size_t data_size; >> > size_t offset; >> > void *data; >> > void *ptr; >> > + u8 class = rproc->elf_class; >> > int phnum = 0; >> > >> > if (list_empty(&rproc->dump_segments)) >> > return; >> > >> > - data_size = sizeof(*ehdr); >> > + data_size = elf_size_of_hdr(class); >> > list_for_each_entry(segment, &rproc->dump_segments, node) { >> > - data_size += sizeof(*phdr) + segment->size; >> > + data_size += elf_size_of_phdr(class) + segment->size; >> > >> > phnum++; >> > } >> > @@ -1590,33 +1592,33 @@ static void rproc_coredump(struct rproc *rproc) >> > >> > ehdr = data; >> > >> > - memset(ehdr, 0, sizeof(*ehdr)); >> > - memcpy(ehdr->e_ident, ELFMAG, SELFMAG); >> > - ehdr->e_ident[EI_CLASS] = ELFCLASS32; >> > - ehdr->e_ident[EI_DATA] = ELFDATA2LSB; >> > - ehdr->e_ident[EI_VERSION] = EV_CURRENT; >> > - ehdr->e_ident[EI_OSABI] = ELFOSABI_NONE; >> > - ehdr->e_type = ET_CORE; >> > - ehdr->e_machine = EM_NONE; >> > - ehdr->e_version = EV_CURRENT; >> > - ehdr->e_entry = rproc->bootaddr; >> > - ehdr->e_phoff = sizeof(*ehdr); >> > - ehdr->e_ehsize = sizeof(*ehdr); >> > - ehdr->e_phentsize = sizeof(*phdr); >> > - ehdr->e_phnum = phnum; >> > - >> > - phdr = data + ehdr->e_phoff; >> > - offset = ehdr->e_phoff + sizeof(*phdr) * ehdr->e_phnum; >> > + memset(ehdr, 0, elf_size_of_hdr(class)); >> > + /* e_ident field is common for both elf32 and elf64 */ >> > + elf_hdr_init_ident(ehdr, class); >> > + >> > + elf_hdr_set_e_type(class, ehdr, ET_CORE); >> > + elf_hdr_set_e_machine(class, ehdr, EM_NONE); >> > + elf_hdr_set_e_version(class, ehdr, EV_CURRENT); >> > + elf_hdr_set_e_entry(class, ehdr, rproc->bootaddr); >> > + elf_hdr_set_e_phoff(class, ehdr, elf_size_of_hdr(class)); >> > + elf_hdr_set_e_ehsize(class, ehdr, elf_size_of_hdr(class)); >> > + elf_hdr_set_e_phentsize(class, ehdr, elf_size_of_phdr(class)); >> > + elf_hdr_set_e_phnum(class, ehdr, phnum); >> > + >> > + phdr = data + elf_hdr_get_e_phoff(class, ehdr); >> > + offset = elf_hdr_get_e_phoff(class, ehdr); >> > + offset += elf_size_of_phdr(class) * elf_hdr_get_e_phnum(class, ehdr); >> > + >> > list_for_each_entry(segment, &rproc->dump_segments, node) { >> > - memset(phdr, 0, sizeof(*phdr)); >> > - phdr->p_type = PT_LOAD; >> > - phdr->p_offset = offset; >> > - phdr->p_vaddr = segment->da; >> > - phdr->p_paddr = segment->da; >> > - phdr->p_filesz = segment->size; >> > - phdr->p_memsz = segment->size; >> > - phdr->p_flags = PF_R | PF_W | PF_X; >> > - phdr->p_align = 0; >> > + memset(phdr, 0, elf_size_of_phdr(class)); >> > + elf_phdr_set_p_type(class, phdr, PT_LOAD); >> > + elf_phdr_set_p_offset(class, phdr, offset); >> > + elf_phdr_set_p_vaddr(class, phdr, segment->da); >> > + elf_phdr_set_p_paddr(class, phdr, segment->da); >> > + elf_phdr_set_p_filesz(class, phdr, segment->size); >> > + elf_phdr_set_p_memsz(class, phdr, segment->size); >> > + elf_phdr_set_p_flags(class, phdr, PF_R | PF_W | PF_X); >> > + elf_phdr_set_p_align(class, phdr, 0); >> > >> > if (segment->dump) { >> > segment->dump(rproc, segment, data + offset); >> > @@ -1632,8 +1634,8 @@ static void rproc_coredump(struct rproc *rproc) >> > } >> > } >> > >> > - offset += phdr->p_filesz; >> > - phdr++; >> > + offset += elf_phdr_get_p_filesz(class, phdr); >> > + phdr += elf_size_of_phdr(class); >> > } >> > >> > dev_coredumpv(&rproc->dev, data, data_size, GFP_KERNEL); >> > @@ -2031,6 +2033,7 @@ struct rproc *rproc_alloc(struct device *dev, const char >> > *name, >> > rproc->name = name; >> > rproc->priv = &rproc[1]; >> > rproc->auto_boot = true; >> > + rproc->elf_class = ELFCLASS32; >> >> I would initialise this to ELFCLASSNONE to make sure that if a platform driver >> overwrites rproc_elf_load_segments or doesn't provide one, we don't falsely >> deduce the elf type. It goes without saying that if elf_class == ELFCLASSNONE, >> a coredump is not generated. >> > > I like the idea of making the choice explicit, perhaps even more > explicit than the assumption that the coredumps should be of the same > type as the ELF loaded. Note that it's different consumers of the two > ELF files. > >> Unless you think this is a seriously bad idea or Bjorn over rules me, Ok, I tried to do the equivalent of what was existing (ie elf32 by default). But IMHO, letting the driver choose the elf type is a better idea. >> >> Reviewed-by: Mathieu Poirier >> > > Not sure if it count as "over ruling", I accept your suggestion but used > your R-b to merge the patch as is, no need to hold this up any longer. > > Clement, can you please follow up with a patch implementing this (don't > forget that the qcom drivers doesn't use rproc_elf_load_segments()) I was going to send a v7, please tell me if you want to hold it a bit more. If not, I will address the remaining comments in next commits. > > Thanks Clement and thanks for the reviews Mathieu. > > Regards, > Bjorn > >> Thanks, >> Mathieu >> >> > >> > device_initialize(&rproc->dev); >> > rproc->dev.parent = dev; >> > diff --git a/drivers/remoteproc/remoteproc_elf_loader.c >> > b/drivers/remoteproc/remoteproc_elf_loader.c >> > index 4869fb7d8fe4..16e2c496fd45 100644 >> > --- a/drivers/remoteproc/remoteproc_elf_loader.c >> > +++ b/drivers/remoteproc/remoteproc_elf_loader.c >> > @@ -248,6 +248,9 @@ int rproc_elf_load_segments(struct rproc *rproc, const >> > struct firmware *fw) >> > memset(ptr + filesz, 0, memsz - filesz); >> > } >> > >> > + if (ret == 0) >> > + rproc->elf_class = class; >> > + >> > return ret; >> > } >> > EXPORT_SYMBOL(rproc_elf_load_segments); >> > diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h >> > index 1683d6c386a6..ed127b2d35ca 100644 >> > --- a/include/linux/remoteproc.h >> > +++ b/include/linux/remoteproc.h >> > @@ -514,6 +514,7 @@ struct rproc { >> > bool auto_boot; >> > struct list_head dump_segments; >> > int nb_vdev; >> > + u8 elf_class; >> > }; >> > >> > /** >> > -- >> > 2.15.0.276.g89ea799