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[68.147.8.254]) by smtp.gmail.com with ESMTPSA id fz21sm766461pjb.15.2020.02.05.14.49.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Feb 2020 14:49:39 -0800 (PST) Date: Wed, 5 Feb 2020 15:49:36 -0700 From: Mathieu Poirier To: Clement Leger Cc: Ohad Ben-Cohen , Bjorn Andersson , Jonathan Corbet , Shawn Guo , Sascha Hauer , linux-remoteproc@vger.kernel.org, Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Andy Gross , Patrice Chotard , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, Arnaud Pouliquen , Loic PALLARDY , s-anna Subject: Re: [PATCH v3 2/2] remoteproc: Add elf64 support in elf loader Message-ID: <20200205224936.GB25901@xps15> References: <20200129163013.GA16538@xps15> <20200204174412.16814-1-cleger@kalray.eu> <20200204174412.16814-3-cleger@kalray.eu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200204174412.16814-3-cleger@kalray.eu> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org On Tue, Feb 04, 2020 at 06:44:12PM +0100, 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 accommodate 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 > --- > Documentation/remoteproc.txt | 2 +- > drivers/remoteproc/remoteproc_elf_loader.c | 147 ++++++++++++++++++----------- > 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, 167 insertions(+), 59 deletions(-) > create mode 100644 drivers/remoteproc/remoteproc_elf_loader.h > > diff --git a/Documentation/remoteproc.txt b/Documentation/remoteproc.txt > index 03c3d2e568b0..2be1147256e0 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 606aae166eba..21fd2b2fe5ae 100644 > --- a/drivers/remoteproc/remoteproc_elf_loader.c > +++ b/drivers/remoteproc/remoteproc_elf_loader.c > @@ -23,6 +23,7 @@ > #include > > #include "remoteproc_internal.h" > +#include "remoteproc_elf_loader.h" > > /** > * rproc_elf_sanity_check() - Sanity Check ELF firmware image > @@ -35,8 +36,16 @@ 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); > @@ -50,13 +59,22 @@ int rproc_elf_sanity_check(struct rproc *rproc, const struct firmware *fw) > > 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; > + } > + > class = ehdr->e_ident[EI_CLASS]; > - if (class != ELFCLASS32) { > + if (class != ELFCLASS32 && class != ELFCLASS64) { > dev_err(dev, "Unsupported class: %d\n", class); > return -EINVAL; > } > > + if (class == ELFCLASS64 && fw->size < sizeof(struct elf64_hdr)) { > + dev_err(dev, "elf64 header is too small\n"); > + return -EINVAL; > + } > + > /* We assume the firmware has the same endianness as the host */ > # ifdef __LITTLE_ENDIAN > if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB) { > @@ -67,26 +85,29 @@ 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); > + > return 0; > } > EXPORT_SYMBOL(rproc_elf_sanity_check); > @@ -102,11 +123,9 @@ 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); > > @@ -137,37 +156,41 @@ 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; > @@ -176,14 +199,15 @@ 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. > @@ -200,24 +224,35 @@ 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 * > +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; > - > - for (i = 0; i < ehdr->e_shnum; i++, shdr++) { > - u32 size = shdr->sh_size; > - u32 offset = shdr->sh_offset; > - > - if (strcmp(name_table + shdr->sh_name, ".resource_table")) > + /* First, get the section header according to the elf class */ > + shdr = elf_data + elf_hdr_e_shoff(class, ehdr); > + /* Compute name table section header entry in shdr array */ > + name_table_shdr = shdr + (shstrndx * elf_shdr_size); > + /* Finally, compute the name table section address in elf */ > + name_table = elf_data + elf_shdr_sh_offset(class, name_table_shdr); > + > + 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 + name, ".resource_table")) > continue; > > table = (struct resource_table *)(elf_data + offset); > @@ -270,21 +305,21 @@ 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 > @@ -317,13 +352,17 @@ 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); > } > 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) > + > +#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 004867061721..eeb26434220e 100644 > --- a/drivers/remoteproc/remoteproc_internal.h > +++ b/drivers/remoteproc/remoteproc_internal.h > @@ -55,7 +55,7 @@ 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 ee13d23b43a9..a3268d95a50e 100644 > --- a/drivers/remoteproc/st_remoteproc.c > +++ b/drivers/remoteproc/st_remoteproc.c > @@ -190,7 +190,7 @@ 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 f84bd5fe0211..82cebca9344c 100644 > --- a/include/linux/remoteproc.h > +++ b/include/linux/remoteproc.h > @@ -382,7 +382,7 @@ 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); > }; > > /** > @@ -498,7 +498,7 @@ struct rproc { > int num_traces; > struct list_head carveouts; > struct list_head mappings; > - u32 bootaddr; > + u64 bootaddr; That will cause problems for rproc_coredump()[1] and fixing it properly likely means that a 32 or 64 elf should be generated based on the type of image that was loaded. This is also true if ->p_vaddr and ->p_paddr (also in the same function) are to be handled properly. I'm interested in your opinion on this. Thanks, Mathieu [1]. https://elixir.bootlin.com/linux/latest/source/drivers/remoteproc/remoteproc_core.c#L1600 > struct list_head rvdevs; > struct list_head subdevs; > struct idr notifyids; > -- > 2.15.0.276.g89ea799 >