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remoteproc: Add elf helpers to access elf64 and elf32 fields

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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.

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Clement Leger <cleger@kalray.eu>
Link: https://lore.kernel.org/r/20200302093902.27849-5-cleger@kalray.eu
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Clement Leger 2020-03-02 10:38:58 +01:00 committed by Bjorn Andersson
parent e4ae4b7d01
commit 73516a3358
1 changed files with 96 additions and 0 deletions
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96
drivers/remoteproc/remoteproc_elf_helpers.h Normal file
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/* 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 */