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[68.147.8.254]) by smtp.gmail.com with ESMTPSA id k29sm3570175pfh.77.2020.01.29.08.30.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Jan 2020 08:30:15 -0800 (PST) Date: Wed, 29 Jan 2020 09:30:13 -0700 From: Mathieu Poirier To: =?iso-8859-1?Q?Cl=E9ment?= Leger Cc: Ohad Ben-Cohen , Bjorn Andersson , linux-remoteproc , linux-kernel , Arnaud Pouliquen , Loic PALLARDY , s-anna Subject: Re: [PATCH v2] remoteproc: Add elf64 support in elf loader Message-ID: <20200129163013.GA16538@xps15> References: <20190819114516.28665-1-cleger@kalray.eu> <20191004184220.24817-1-cleger@kalray.eu> <20200124005309.GA30148@xps15> <416367983.521160.1579854256209.JavaMail.zimbra@kalray.eu> <20200124215841.GA29774@xps15> <831166982.775903.1580114011889.JavaMail.zimbra@kalray.eu> <2103721910.1185467.1580288117275.JavaMail.zimbra@kalray.eu> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <2103721910.1185467.1580288117275.JavaMail.zimbra@kalray.eu> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jan 29, 2020 at 09:55:17AM +0100, Clément Leger wrote: > Ok, here is the example to be more clear: > > Content of elfxx_loader.h: > > int elf##ELF_TYPE##_load(...) { > struct elf##ELF_TYPE##_shdr *shdr = data; > ... > } > > Then in elf_loader.c file: > > #define ELF_TYPE 32 > #include "elfxx_loader.h" > #undef ELF_TYPE > #define ELF_TYPE 64 > #include "elfxx_loader.h" > > int elf_load(...) { > if (class == elf64) > elf64_load(...); > else > elf32_load(...); > } > > This is used for syscall_table.c in arch for instance. > A macro must be defined and then the ehader is included and > "generates" code. > > #undef __SYSCALL > #define __SYSCALL(nr, call) [nr] = (call), > > void *sys_call_table[__NR_syscalls] = { > [0 ... __NR_syscalls - 1] = sys_ni_syscall, > #include > }; > > Hope this shed some light on my suggestion. Thank you for taking the time to do this. I fear elfxx_loader.h would become very cryptic and hard to debug. I think your original approach strikes the right balance between readabiliy and code duplication. > > Clément > > ----- On 28 Jan, 2020, at 18:14, Mathieu Poirier mathieu.poirier@linaro.org wrote: > > > On Mon, 27 Jan 2020 at 01:33, Clément Leger wrote: > >> > >> Hi Mathieu, > >> > >> Thanks for your thorough review. While thinking about it,there is at least > >> another option which would consist in splitting all elf specific functions into > >> a separate .h file and then include it in a .c to "instantiate" the functions > >> with correct types. For instance, it would look like this: > >> > >> #define ELF_TYPE 32 > >> #include "elf_functions.h" > >> #undef ELF_TYPE > >> #define ELF_TYPE 64 > >> #include "elf_functions.h" > >> > >> pros: More readable and type-checking ok > >> cons: A bit hackish > >> > >> I would say this might be a better optino than my current patch. > >> However, I'm not sure this kind of thing of well accepted in the kernel. > > > > I won't claim to fully understand your suggestion above, but if it is > > suspicious enough to look hackish to you than it will probably look > > hackish to other people. Nonetheless there might be a case for > > exception if the approach yields clear advantages. Can you point me > > to an example somewhere in the kernel code where something similar > > would have been done? > > > >> > >> Clément > >> > >> ----- On 24 Jan, 2020, at 22:58, Mathieu Poirier mathieu.poirier@linaro.org > >> wrote: > >> > >> > On Fri, Jan 24, 2020 at 09:24:16AM +0100, Clément Leger wrote: > >> >> Hi Mathieu, > >> >> > >> >> ----- On 24 Jan, 2020, at 01:53, Mathieu Poirier mathieu.poirier@linaro.org > >> >> wrote: > >> >> > >> >> > Hi Clement, > >> >> > > >> >> > On Fri, Oct 04, 2019 at 08:42:20PM +0200, Clement Leger wrote: > >> >> >> elf32 and elf64 mainly differ by their types. In order to avoid > >> >> >> copy/pasting the whole loader code, generate static inline functions > >> >> >> which will access values according to the elf class. It allows to keep a > >> >> >> common loader basis. > >> >> >> In order to accomodate both elf types sizes, the maximum size for a > >> >> >> elf header member is chosen using the maximum value of both elf class. > >> >> >> > >> >> >> Signed-off-by: Clement Leger > >> >> >> Tested-by: Arnaud POULIQUEN > >> >> >> --- > >> >> >> Changes in v2: > >> >> >> - Add ELF64 support in documentation > >> >> >> > >> >> > > >> >> > First and foremost please address the complaints from checkpatch. > >> >> > >> >> I fixed one typo in accommodate. The other checkpatch complaint is > >> >> about missing parenthesis for macros with complex values which is > >> >> unfortunately not possible since I'm generating inline functions. > >> >> > >> >> Did you have any other one ? > >> >> > >> >> > > >> >> >> --- > >> >> >> Documentation/remoteproc.txt | 2 +- > >> >> >> drivers/remoteproc/remoteproc_elf_loader.c | 135 ++++++++++++++++++----------- > >> >> >> drivers/remoteproc/remoteproc_elf_loader.h | 69 +++++++++++++++ > >> >> >> drivers/remoteproc/remoteproc_internal.h | 2 +- > >> >> >> drivers/remoteproc/st_remoteproc.c | 2 +- > >> >> >> include/linux/remoteproc.h | 4 +- > >> >> >> 6 files changed, 157 insertions(+), 57 deletions(-) > >> >> >> create mode 100644 drivers/remoteproc/remoteproc_elf_loader.h > >> >> >> > >> >> >> diff --git a/Documentation/remoteproc.txt b/Documentation/remoteproc.txt > >> >> >> index 77fb03acdbb4..bf4f0c41ec4e 100644 > >> >> >> --- a/Documentation/remoteproc.txt > >> >> >> +++ b/Documentation/remoteproc.txt > >> >> >> @@ -230,7 +230,7 @@ in the used rings. > >> >> >> Binary Firmware Structure > >> >> >> ========================= > >> >> >> > >> >> >> -At this point remoteproc only supports ELF32 firmware binaries. However, > >> >> >> +At this point remoteproc supports ELF32 and ELF64 firmware binaries. However, > >> >> >> it is quite expected that other platforms/devices which we'd want to > >> >> >> support with this framework will be based on different binary formats. > >> >> >> > >> >> >> diff --git a/drivers/remoteproc/remoteproc_elf_loader.c > >> >> >> b/drivers/remoteproc/remoteproc_elf_loader.c > >> >> >> index b17d72ec8603..6a2d31d6092c 100644 > >> >> >> --- a/drivers/remoteproc/remoteproc_elf_loader.c > >> >> >> +++ b/drivers/remoteproc/remoteproc_elf_loader.c > >> >> >> @@ -31,6 +31,7 @@ > >> >> >> #include > >> >> >> > >> >> >> #include "remoteproc_internal.h" > >> >> >> +#include "remoteproc_elf_loader.h" > >> >> >> > >> >> >> /** > >> >> >> * rproc_elf_sanity_check() - Sanity Check ELF firmware image > >> >> >> @@ -43,8 +44,16 @@ int rproc_elf_sanity_check(struct rproc *rproc, const struct > >> >> >> firmware *fw) > >> >> >> { > >> >> >> const char *name = rproc->firmware; > >> >> >> struct device *dev = &rproc->dev; > >> >> >> + /* > >> >> >> + * Elf files are beginning with the same structure. Thus, to simplify > >> >> >> + * header parsing, we can use the elf32_hdr one for both elf64 and > >> >> >> + * elf32. > >> >> >> + */ > >> >> >> struct elf32_hdr *ehdr; > >> >> >> + u32 elf_shdr_size; > >> >> >> + u64 phoff, shoff; > >> >> >> char class; > >> >> >> + u16 phnum; > >> >> >> > >> >> >> if (!fw) { > >> >> >> dev_err(dev, "failed to load %s\n", name); > >> >> >> @@ -58,9 +67,13 @@ int rproc_elf_sanity_check(struct rproc *rproc, const struct > >> >> >> firmware *fw) > >> >> > > >> >> > In the current code [1] fw->size is compared against the size of an elf32_hdr. > >> >> > If support for elf64 is added that code needs to be modified to check for the > >> >> > right header size using fw_elf_get_class(). > >> >> > >> >> Actually, the elf32 header is smaller than the elf64 one so this check is > >> >> there to ensure that we have at least a minimal elf header (elf32). > >> >> And since the class is derived from the header, you better have to check the > >> >> header size before accessing it. > >> >> > >> >> To be more clear, I could compare it to min(sizeof(struct elf32_hdr), > >> >> sizeof(struct elf64_hdr)) or add a comment at least stating that since > >> >> elf header contains the same fields for identification, we can use the > >> >> elf32 one. > >> >> > >> >> > > >> >> > [1] > >> >> > https://elixir.bootlin.com/linux/v5.5-rc6/source/drivers/remoteproc/remoteproc_elf_loader.c#L46 > >> >> > > >> >> >> > >> >> >> ehdr = (struct elf32_hdr *)fw->data; > >> >> >> > >> >> >> - /* We only support ELF32 at this point */ > >> >> >> + if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG)) { > >> >> >> + dev_err(dev, "Image is corrupted (bad magic)\n"); > >> >> >> + return -EINVAL; > >> >> >> + } > >> >> >> + > >> >> > > >> >> > Is there a reason to move this check up where? If not please bring it back to > >> >> > its original location, that is below: > >> >> > > >> >> > "if (fw->size < ehdr->e_shoff + sizeof(structelf32_shdr))" > >> >> > > >> >> > >> >> This is because the new check for size uses elf_shdr_size which is derived from > >> >> the class. And since the class is extracted from the elf header, we need to > >> >> check > >> >> the header to be correct first. > >> >> > >> >> >> class = ehdr->e_ident[EI_CLASS]; > >> >> >> - if (class != ELFCLASS32) { > >> >> >> + if (class != ELFCLASS32 && class != ELFCLASS64) { > >> >> >> dev_err(dev, "Unsupported class: %d\n", class); > >> >> >> return -EINVAL; > >> >> >> } > >> >> >> @@ -75,26 +88,29 @@ int rproc_elf_sanity_check(struct rproc *rproc, const struct > >> >> >> firmware *fw) > >> >> >> return -EINVAL; > >> >> >> } > >> >> >> > >> >> >> - if (fw->size < ehdr->e_shoff + sizeof(struct elf32_shdr)) { > >> >> >> - dev_err(dev, "Image is too small\n"); > >> >> >> - return -EINVAL; > >> >> >> - } > >> >> >> + phoff = elf_hdr_e_phoff(class, fw->data); > >> >> >> + shoff = elf_hdr_e_shoff(class, fw->data); > >> >> >> + phnum = elf_hdr_e_phnum(class, fw->data); > >> >> >> + elf_shdr_size = elf_size_of_shdr(class); > >> >> >> > >> >> >> - if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG)) { > >> >> >> - dev_err(dev, "Image is corrupted (bad magic)\n"); > >> >> >> + if (fw->size < shoff + elf_shdr_size) { > >> >> >> + dev_err(dev, "Image is too small\n"); > >> >> >> return -EINVAL; > >> >> >> } > >> >> >> > >> >> >> - if (ehdr->e_phnum == 0) { > >> >> >> + if (phnum == 0) { > >> >> >> dev_err(dev, "No loadable segments\n"); > >> >> >> return -EINVAL; > >> >> >> } > >> >> >> > >> >> >> - if (ehdr->e_phoff > fw->size) { > >> >> >> + if (phoff > fw->size) { > >> >> >> dev_err(dev, "Firmware size is too small\n"); > >> >> >> return -EINVAL; > >> >> >> } > >> >> >> > >> >> >> + dev_dbg(dev, "Firmware is an elf%d file\n", > >> >> >> + class == ELFCLASS32 ? 32 : 64); > >> >> >> + > >> >> > > >> >> > Yes, this is useful. > >> >> > > >> >> >> return 0; > >> >> >> } > >> >> >> EXPORT_SYMBOL(rproc_elf_sanity_check); > >> >> >> @@ -110,11 +126,9 @@ EXPORT_SYMBOL(rproc_elf_sanity_check); > >> >> >> * Note that the boot address is not a configurable property of all remote > >> >> >> * processors. Some will always boot at a specific hard-coded address. > >> >> >> */ > >> >> >> -u32 rproc_elf_get_boot_addr(struct rproc *rproc, const struct firmware *fw) > >> >> >> +u64 rproc_elf_get_boot_addr(struct rproc *rproc, const struct firmware *fw) > >> >> >> { > >> >> >> - struct elf32_hdr *ehdr = (struct elf32_hdr *)fw->data; > >> >> >> - > >> >> >> - return ehdr->e_entry; > >> >> >> + return elf_hdr_e_entry(fw_elf_get_class(fw), fw->data); > >> >> >> } > >> >> >> EXPORT_SYMBOL(rproc_elf_get_boot_addr); > >> >> >> > >> >> >> @@ -145,37 +159,41 @@ EXPORT_SYMBOL(rproc_elf_get_boot_addr); > >> >> >> int rproc_elf_load_segments(struct rproc *rproc, const struct firmware *fw) > >> >> >> { > >> >> >> struct device *dev = &rproc->dev; > >> >> >> - struct elf32_hdr *ehdr; > >> >> >> - struct elf32_phdr *phdr; > >> >> >> + const void *ehdr, *phdr; > >> >> >> int i, ret = 0; > >> >> >> + u16 phnum; > >> >> >> const u8 *elf_data = fw->data; > >> >> >> + u8 class = fw_elf_get_class(fw); > >> >> >> + u32 elf_phdr_size = elf_size_of_phdr(class); > >> >> >> > >> >> >> - ehdr = (struct elf32_hdr *)elf_data; > >> >> >> - phdr = (struct elf32_phdr *)(elf_data + ehdr->e_phoff); > >> >> >> + ehdr = elf_data; > >> >> >> + phnum = elf_hdr_e_phnum(class, ehdr); > >> >> >> + phdr = elf_data + elf_hdr_e_phoff(class, ehdr); > >> >> >> > >> >> >> /* go through the available ELF segments */ > >> >> >> - for (i = 0; i < ehdr->e_phnum; i++, phdr++) { > >> >> >> - u32 da = phdr->p_paddr; > >> >> >> - u32 memsz = phdr->p_memsz; > >> >> >> - u32 filesz = phdr->p_filesz; > >> >> >> - u32 offset = phdr->p_offset; > >> >> >> + for (i = 0; i < phnum; i++, phdr += elf_phdr_size) { > >> >> >> + u64 da = elf_phdr_p_paddr(class, phdr); > >> >> >> + u64 memsz = elf_phdr_p_memsz(class, phdr); > >> >> >> + u64 filesz = elf_phdr_p_filesz(class, phdr); > >> >> >> + u64 offset = elf_phdr_p_offset(class, phdr); > >> >> >> + u32 type = elf_phdr_p_type(class, phdr); > >> >> >> void *ptr; > >> >> >> > >> >> >> - if (phdr->p_type != PT_LOAD) > >> >> >> + if (type != PT_LOAD) > >> >> >> continue; > >> >> >> > >> >> >> - dev_dbg(dev, "phdr: type %d da 0x%x memsz 0x%x filesz 0x%x\n", > >> >> >> - phdr->p_type, da, memsz, filesz); > >> >> >> + dev_dbg(dev, "phdr: type %d da 0x%llx memsz 0x%llx filesz 0x%llx\n", > >> >> >> + type, da, memsz, filesz); > >> >> >> > >> >> >> if (filesz > memsz) { > >> >> >> - dev_err(dev, "bad phdr filesz 0x%x memsz 0x%x\n", > >> >> >> + dev_err(dev, "bad phdr filesz 0x%llx memsz 0x%llx\n", > >> >> >> filesz, memsz); > >> >> >> ret = -EINVAL; > >> >> >> break; > >> >> >> } > >> >> >> > >> >> >> if (offset + filesz > fw->size) { > >> >> >> - dev_err(dev, "truncated fw: need 0x%x avail 0x%zx\n", > >> >> >> + dev_err(dev, "truncated fw: need 0x%llx avail 0x%zx\n", > >> >> >> offset + filesz, fw->size); > >> >> >> ret = -EINVAL; > >> >> >> break; > >> >> >> @@ -184,14 +202,15 @@ int rproc_elf_load_segments(struct rproc *rproc, const > >> >> >> struct firmware *fw) > >> >> >> /* grab the kernel address for this device address */ > >> >> >> ptr = rproc_da_to_va(rproc, da, memsz); > >> >> >> if (!ptr) { > >> >> >> - dev_err(dev, "bad phdr da 0x%x mem 0x%x\n", da, memsz); > >> >> >> + dev_err(dev, "bad phdr da 0x%llx mem 0x%llx\n", da, > >> >> >> + memsz); > >> >> >> ret = -EINVAL; > >> >> >> break; > >> >> >> } > >> >> >> > >> >> >> /* put the segment where the remote processor expects it */ > >> >> >> - if (phdr->p_filesz) > >> >> >> - memcpy(ptr, elf_data + phdr->p_offset, filesz); > >> >> >> + if (filesz) > >> >> >> + memcpy(ptr, elf_data + offset, filesz); > >> >> >> > >> >> >> /* > >> >> >> * Zero out remaining memory for this segment. > >> >> >> @@ -208,24 +227,32 @@ int rproc_elf_load_segments(struct rproc *rproc, const > >> >> >> struct firmware *fw) > >> >> >> } > >> >> >> EXPORT_SYMBOL(rproc_elf_load_segments); > >> >> >> > >> >> >> -static struct elf32_shdr * > >> >> >> -find_table(struct device *dev, struct elf32_hdr *ehdr, size_t fw_size) > >> >> >> +static const void * > >> >> > > >> >> > Not sure I understand the "const" - was the compiler complaining? > >> >> > >> >> It's actually caused by the fact I used a const void* shdr in the caller. > >> >> I will check if this is mandatory. > >> >> > >> >> > > >> >> >> +find_table(struct device *dev, const struct firmware *fw) > >> >> >> { > >> >> >> - struct elf32_shdr *shdr; > >> >> >> + const void *shdr, *name_table_shdr; > >> >> >> int i; > >> >> >> const char *name_table; > >> >> >> struct resource_table *table = NULL; > >> >> >> - const u8 *elf_data = (void *)ehdr; > >> >> >> + const u8 *elf_data = (void *)fw->data; > >> >> >> + u8 class = fw_elf_get_class(fw); > >> >> >> + size_t fw_size = fw->size; > >> >> >> + const void *ehdr = elf_data; > >> >> >> + u16 shnum = elf_hdr_e_shnum(class, ehdr); > >> >> >> + u32 elf_shdr_size = elf_size_of_shdr(class); > >> >> >> + u16 shstrndx = elf_hdr_e_shstrndx(class, ehdr); > >> >> >> > >> >> >> /* look for the resource table and handle it */ > >> >> >> - shdr = (struct elf32_shdr *)(elf_data + ehdr->e_shoff); > >> >> >> - name_table = elf_data + shdr[ehdr->e_shstrndx].sh_offset; > >> >> >> + shdr = elf_data + elf_hdr_e_shoff(class, ehdr); > >> >> >> + name_table_shdr = shdr + (shstrndx * elf_shdr_size); > >> >> >> + name_table = elf_data + elf_shdr_sh_offset(class, name_table_shdr); > >> >> > > >> >> > It took me a while but I figured out what is happening here. To save me (and > >> >> > other people) from going through the same mental process every time I look at > >> >> > this code, please add a comment for each of the above 3 lines. > >> >> > >> >> Indeed. > >> >> > >> >> > > >> >> >> > >> >> >> - for (i = 0; i < ehdr->e_shnum; i++, shdr++) { > >> >> >> - u32 size = shdr->sh_size; > >> >> >> - u32 offset = shdr->sh_offset; > >> >> >> + for (i = 0; i < shnum; i++, shdr += elf_shdr_size) { > >> >> >> + u64 size = elf_shdr_sh_size(class, shdr); > >> >> >> + u64 offset = elf_shdr_sh_offset(class, shdr); > >> >> >> + u32 name = elf_shdr_sh_name(class, shdr); > >> >> >> > >> >> >> - if (strcmp(name_table + shdr->sh_name, ".resource_table")) > >> >> >> + if (strcmp(name_table + name, ".resource_table")) > >> >> >> continue; > >> >> >> > >> >> >> table = (struct resource_table *)(elf_data + offset); > >> >> >> @@ -279,21 +306,21 @@ find_table(struct device *dev, struct elf32_hdr *ehdr, > >> >> >> size_t fw_size) > >> >> >> */ > >> >> >> int rproc_elf_load_rsc_table(struct rproc *rproc, const struct firmware *fw) > >> >> >> { > >> >> >> - struct elf32_hdr *ehdr; > >> >> >> - struct elf32_shdr *shdr; > >> >> >> + const void *shdr; > >> >> >> struct device *dev = &rproc->dev; > >> >> >> struct resource_table *table = NULL; > >> >> >> const u8 *elf_data = fw->data; > >> >> >> size_t tablesz; > >> >> >> + u8 class = fw_elf_get_class(fw); > >> >> >> + u64 sh_offset; > >> >> >> > >> >> >> - ehdr = (struct elf32_hdr *)elf_data; > >> >> >> - > >> >> >> - shdr = find_table(dev, ehdr, fw->size); > >> >> >> + shdr = find_table(dev, fw); > >> >> >> if (!shdr) > >> >> >> return -EINVAL; > >> >> >> > >> >> >> - table = (struct resource_table *)(elf_data + shdr->sh_offset); > >> >> >> - tablesz = shdr->sh_size; > >> >> >> + sh_offset = elf_shdr_sh_offset(class, shdr); > >> >> >> + table = (struct resource_table *)(elf_data + sh_offset); > >> >> >> + tablesz = elf_shdr_sh_size(class, shdr); > >> >> >> > >> >> >> /* > >> >> >> * Create a copy of the resource table. When a virtio device starts > >> >> >> @@ -326,13 +353,17 @@ EXPORT_SYMBOL(rproc_elf_load_rsc_table); > >> >> >> struct resource_table *rproc_elf_find_loaded_rsc_table(struct rproc *rproc, > >> >> >> const struct firmware *fw) > >> >> >> { > >> >> >> - struct elf32_hdr *ehdr = (struct elf32_hdr *)fw->data; > >> >> >> - struct elf32_shdr *shdr; > >> >> >> + const void *shdr; > >> >> >> + u64 sh_addr, sh_size; > >> >> >> + u8 class = fw_elf_get_class(fw); > >> >> >> > >> >> >> - shdr = find_table(&rproc->dev, ehdr, fw->size); > >> >> >> + shdr = find_table(&rproc->dev, fw); > >> >> >> if (!shdr) > >> >> >> return NULL; > >> >> >> > >> >> >> - return rproc_da_to_va(rproc, shdr->sh_addr, shdr->sh_size); > >> >> >> + sh_addr = elf_shdr_sh_addr(class, shdr); > >> >> >> + sh_size = elf_shdr_sh_size(class, shdr); > >> >> >> + > >> >> >> + return rproc_da_to_va(rproc, sh_addr, sh_size); > >> >> > > >> >> > The prototype for the above is as follow: > >> >> > > >> >> > void *rproc_da_to_va(struct rproc *rproc, u64 da, int len) > >> >> > > >> >> > But sh_size is a u64, which will cause problem that are hard to debug. I think > >> >> > it is better to move 'len' to an 8 byte type along with the refactoring of the > >> >> > existing code that is implied. I suggest to split this work in a preparatory > >> >> > patch (that will still be part of this set). > >> >> > >> >> Nice catch ! I will do that. > >> >> > >> >> > > >> >> >> } > >> >> >> EXPORT_SYMBOL(rproc_elf_find_loaded_rsc_table); > >> >> >> diff --git a/drivers/remoteproc/remoteproc_elf_loader.h > >> >> >> b/drivers/remoteproc/remoteproc_elf_loader.h > >> >> >> new file mode 100644 > >> >> >> index 000000000000..fac3565734f9 > >> >> >> --- /dev/null > >> >> >> +++ b/drivers/remoteproc/remoteproc_elf_loader.h > >> >> >> @@ -0,0 +1,69 @@ > >> >> >> +/* SPDX-License-Identifier: GPL-2.0 */ > >> >> >> +/* > >> >> >> + * Remote processor elf loader defines > >> >> >> + * > >> >> >> + * Copyright (C) 2019 Kalray, Inc. > >> >> >> + */ > >> >> >> + > >> >> >> +#ifndef REMOTEPROC_ELF_LOADER_H > >> >> >> +#define REMOTEPROC_ELF_LOADER_H > >> >> >> + > >> >> >> +#include > >> >> >> +#include > >> >> >> + > >> >> >> +/** > >> >> >> + * fw_elf_get_class - Get elf class > >> >> >> + * @fw: the ELF firmware image > >> >> >> + * > >> >> >> + * Note that we use and elf32_hdr to access the class since the start of the > >> >> >> + * struct is the same for both elf class > >> >> >> + * > >> >> >> + * Return: elf class of the firmware > >> >> >> + */ > >> >> >> +static inline u8 fw_elf_get_class(const struct firmware *fw) > >> >> >> +{ > >> >> >> + struct elf32_hdr *ehdr = (struct elf32_hdr *)fw->data; > >> >> >> + > >> >> >> + return ehdr->e_ident[EI_CLASS]; > >> >> >> +} > >> >> >> + > >> >> >> +#define ELF_GET_FIELD(__s, __field, __type) \ > >> >> >> +static inline __type elf_##__s##_##__field(u8 class, const void *arg) \ > >> >> >> +{ \ > >> >> >> + if (class == ELFCLASS32) \ > >> >> >> + return (__type) ((const struct elf32_##__s *) arg)->__field; \ > >> >> >> + else \ > >> >> >> + return (__type) ((const struct elf64_##__s *) arg)->__field; \ > >> >> >> +} > >> >> >> + > >> >> >> +ELF_GET_FIELD(hdr, e_entry, u64) > >> >> >> +ELF_GET_FIELD(hdr, e_phnum, u16) > >> >> >> +ELF_GET_FIELD(hdr, e_shnum, u16) > >> >> >> +ELF_GET_FIELD(hdr, e_phoff, u64) > >> >> >> +ELF_GET_FIELD(hdr, e_shoff, u64) > >> >> >> +ELF_GET_FIELD(hdr, e_shstrndx, u16) > >> >> >> + > >> >> >> +ELF_GET_FIELD(phdr, p_paddr, u64) > >> >> >> +ELF_GET_FIELD(phdr, p_filesz, u64) > >> >> >> +ELF_GET_FIELD(phdr, p_memsz, u64) > >> >> >> +ELF_GET_FIELD(phdr, p_type, u32) > >> >> >> +ELF_GET_FIELD(phdr, p_offset, u64) > >> >> >> + > >> >> >> +ELF_GET_FIELD(shdr, sh_size, u64) > >> >> >> +ELF_GET_FIELD(shdr, sh_offset, u64) > >> >> >> +ELF_GET_FIELD(shdr, sh_name, u32) > >> >> >> +ELF_GET_FIELD(shdr, sh_addr, u64) > >> >> > > >> >> > I like how you did this. > >> >> > > >> >> >> + > >> >> >> +#define ELF_STRUCT_SIZE(__s) \ > >> >> >> +static inline unsigned long elf_size_of_##__s(u8 class) \ > >> >> >> +{ \ > >> >> >> + if (class == ELFCLASS32)\ > >> >> >> + return sizeof(struct elf32_##__s); \ > >> >> >> + else \ > >> >> >> + return sizeof(struct elf64_##__s); \ > >> >> >> +} > >> >> >> + > >> >> >> +ELF_STRUCT_SIZE(shdr) > >> >> >> +ELF_STRUCT_SIZE(phdr) > >> >> >> + > >> >> >> +#endif /* REMOTEPROC_ELF_LOADER_H */ > >> >> >> diff --git a/drivers/remoteproc/remoteproc_internal.h > >> >> >> b/drivers/remoteproc/remoteproc_internal.h > >> >> >> index 45ff76a06c72..4ef745e3a1bc 100644 > >> >> >> --- a/drivers/remoteproc/remoteproc_internal.h > >> >> >> +++ b/drivers/remoteproc/remoteproc_internal.h > >> >> >> @@ -63,7 +63,7 @@ phys_addr_t rproc_va_to_pa(void *cpu_addr); > >> >> >> int rproc_trigger_recovery(struct rproc *rproc); > >> >> >> > >> >> >> int rproc_elf_sanity_check(struct rproc *rproc, const struct firmware *fw); > >> >> >> -u32 rproc_elf_get_boot_addr(struct rproc *rproc, const struct firmware *fw); > >> >> >> +u64 rproc_elf_get_boot_addr(struct rproc *rproc, const struct firmware *fw); > >> >> >> int rproc_elf_load_segments(struct rproc *rproc, const struct firmware *fw); > >> >> >> int rproc_elf_load_rsc_table(struct rproc *rproc, const struct firmware *fw); > >> >> >> struct resource_table *rproc_elf_find_loaded_rsc_table(struct rproc *rproc, > >> >> >> diff --git a/drivers/remoteproc/st_remoteproc.c > >> >> >> b/drivers/remoteproc/st_remoteproc.c > >> >> >> index 51049d17b1e5..e23abd8a96b0 100644 > >> >> >> --- a/drivers/remoteproc/st_remoteproc.c > >> >> >> +++ b/drivers/remoteproc/st_remoteproc.c > >> >> >> @@ -193,7 +193,7 @@ static int st_rproc_start(struct rproc *rproc) > >> >> >> } > >> >> >> } > >> >> >> > >> >> >> - dev_info(&rproc->dev, "Started from 0x%x\n", rproc->bootaddr); > >> >> >> + dev_info(&rproc->dev, "Started from 0x%llx\n", rproc->bootaddr); > >> >> >> > >> >> >> return 0; > >> >> >> > >> >> >> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h > >> >> >> index 04d04709f2bd..512de9a2590c 100644 > >> >> >> --- a/include/linux/remoteproc.h > >> >> >> +++ b/include/linux/remoteproc.h > >> >> >> @@ -362,7 +362,7 @@ struct rproc_ops { > >> >> >> struct rproc *rproc, const struct firmware *fw); > >> >> >> int (*load)(struct rproc *rproc, const struct firmware *fw); > >> >> >> int (*sanity_check)(struct rproc *rproc, const struct firmware *fw); > >> >> >> - u32 (*get_boot_addr)(struct rproc *rproc, const struct firmware *fw); > >> >> >> + u64 (*get_boot_addr)(struct rproc *rproc, const struct firmware *fw); > >> >> >> }; > >> >> >> > >> >> >> /** > >> >> >> @@ -478,7 +478,7 @@ struct rproc { > >> >> >> int num_traces; > >> >> >> struct list_head carveouts; > >> >> >> struct list_head mappings; > >> >> >> - u32 bootaddr; > >> >> >> + u64 bootaddr; > >> >> >> struct list_head rvdevs; > >> >> >> struct list_head subdevs; > >> >> >> struct idr notifyids; > >> >> > > >> >> > Please hold off before doing another respin of this patch. While doing > >> >> > something completely different I noticed TI also did some work in this area. > >> >> > I'd like to take some time to look at their implementation and see if they carry > >> >> > features that haven't been included here. I intend to do this tomorrow. > >> >> > >> >> Ok, > >> >> > >> >> Thanks for your review, > >> > > >> > As promised I looked at what Suman had done on his side [1] to support 64-bit > >> > ELF > >> > files. His approach to offer the same functionality but for 64 bit in a new file > >> > is quick, simple and flexible. On the flip side it introduces code duplication, > >> > something that is seriously frowned upon upstream. > >> > > >> > I did some soul searching in the kernel code and found very little in terms of > >> > implementation that deals with both 32 and 64 bit ELF format. The most > >> > convincing approach was set forth by the MIPS guys [2]. They too have decided > >> > to support both types in the same functions, but I don't see us adding an if() > >> > statement (and the code duplication that comes with it) every time we need to > >> > deal with file types. > >> > > >> > Given the above I'm in favour of moving forward with your approach. One could > >> > rightly argue the macros make the code harder to read but given the > >> > alternatives, it seems to be the best solution. > >> > > >> > Mathieu > >> > > >> > [1]. https://bit.ly/2Rpmb4E > >> > [2]. https://elixir.bootlin.com/linux/v5.5-rc6/source/arch/mips/kernel/elf.c#L75 > >> >> > >> >> Clément > >> >> > >> >> > > >> >> > Thanks, > >> >> > Mathieu > >> >> > > >> >> >> -- > > > > > >> 2.15.0.276.g89ea799