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Date: Mon, 2 Mar 2020 15:12:36 -0800 From: Bjorn Andersson <bjorn.andersson@...aro.org> To: Clement Leger <cleger@...ray.eu> Cc: Ohad Ben-Cohen <ohad@...ery.com>, Jonathan Corbet <corbet@....net>, Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, linux-remoteproc@...r.kernel.org, Pengutronix Kernel Team <kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>, NXP Linux Team <linux-imx@....com>, Andy Gross <agross@...nel.org>, Patrice Chotard <patrice.chotard@...com>, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org, Arnaud Pouliquen <arnaud.pouliquen@...com>, Loic PALLARDY <loic.pallardy@...com>, s-anna <s-anna@...com>, Mathieu Poirier <mathieu.poirier@...aro.org> Subject: Re: [PATCH v5 4/8] remoteproc: Add elf helpers to access elf64 and elf32 fields On Mon 02 Mar 01:38 PST 2020, 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 the field for > both elf class. > > Signed-off-by: Clement Leger <cleger@...ray.eu> Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org> > --- > drivers/remoteproc/remoteproc_elf_helpers.h | 96 +++++++++++++++++++++++++++++ > 1 file changed, 96 insertions(+) > create mode 100644 drivers/remoteproc/remoteproc_elf_helpers.h > > diff --git a/drivers/remoteproc/remoteproc_elf_helpers.h b/drivers/remoteproc/remoteproc_elf_helpers.h > new file mode 100644 > index 000000000000..4b6be7b6bf4d > --- /dev/null > +++ b/drivers/remoteproc/remoteproc_elf_helpers.h > @@ -0,0 +1,96 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +/* > + * Remote processor elf helpers defines > + * > + * Copyright (C) 2020 Kalray, Inc. > + */ > + > +#ifndef REMOTEPROC_ELF_LOADER_H > +#define REMOTEPROC_ELF_LOADER_H > + > +#include <linux/elf.h> > +#include <linux/types.h> > + > +/** > + * 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]; > +} > + > +static inline void elf_hdr_init_ident(struct elf32_hdr *hdr, u8 class) > +{ > + memcpy(hdr->e_ident, ELFMAG, SELFMAG); > + hdr->e_ident[EI_CLASS] = class; > + hdr->e_ident[EI_DATA] = ELFDATA2LSB; > + hdr->e_ident[EI_VERSION] = EV_CURRENT; > + hdr->e_ident[EI_OSABI] = ELFOSABI_NONE; > +} > + > +/* Generate getter and setter for a specific elf struct/field */ > +#define ELF_GEN_FIELD_GET_SET(__s, __field, __type) \ > +static inline __type elf_##__s##_get_##__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; \ > +} \ > +static inline void elf_##__s##_set_##__field(u8 class, void *arg, \ > + __type value) \ > +{ \ > + if (class == ELFCLASS32) \ > + ((struct elf32_##__s *) arg)->__field = (__type) value; \ > + else \ > + ((struct elf64_##__s *) arg)->__field = (__type) value; \ > +} > + > +ELF_GEN_FIELD_GET_SET(hdr, e_entry, u64) > +ELF_GEN_FIELD_GET_SET(hdr, e_phnum, u16) > +ELF_GEN_FIELD_GET_SET(hdr, e_shnum, u16) > +ELF_GEN_FIELD_GET_SET(hdr, e_phoff, u64) > +ELF_GEN_FIELD_GET_SET(hdr, e_shoff, u64) > +ELF_GEN_FIELD_GET_SET(hdr, e_shstrndx, u16) > +ELF_GEN_FIELD_GET_SET(hdr, e_machine, u16) > +ELF_GEN_FIELD_GET_SET(hdr, e_type, u16) > +ELF_GEN_FIELD_GET_SET(hdr, e_version, u32) > +ELF_GEN_FIELD_GET_SET(hdr, e_ehsize, u32) > +ELF_GEN_FIELD_GET_SET(hdr, e_phentsize, u16) > + > +ELF_GEN_FIELD_GET_SET(phdr, p_paddr, u64) > +ELF_GEN_FIELD_GET_SET(phdr, p_vaddr, u64) > +ELF_GEN_FIELD_GET_SET(phdr, p_filesz, u64) > +ELF_GEN_FIELD_GET_SET(phdr, p_memsz, u64) > +ELF_GEN_FIELD_GET_SET(phdr, p_type, u32) > +ELF_GEN_FIELD_GET_SET(phdr, p_offset, u64) > +ELF_GEN_FIELD_GET_SET(phdr, p_flags, u32) > +ELF_GEN_FIELD_GET_SET(phdr, p_align, u64) > + > +ELF_GEN_FIELD_GET_SET(shdr, sh_size, u64) > +ELF_GEN_FIELD_GET_SET(shdr, sh_offset, u64) > +ELF_GEN_FIELD_GET_SET(shdr, sh_name, u32) > +ELF_GEN_FIELD_GET_SET(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) > +ELF_STRUCT_SIZE(hdr) > + > +#endif /* REMOTEPROC_ELF_LOADER_H */ > -- > 2.15.0.276.g89ea799 >
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