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authorClement Leger <cleger@kalray.eu>2020-03-02 12:38:58 +0300
committerBjorn Andersson <bjorn.andersson@linaro.org>2020-03-26 08:29:39 +0300
commit73516a33588cde0bfa4742d857f8849da28bddd2 (patch)
tree6a783656269a22d2ec1382ac0f98ead2158d5c53 /drivers
parente4ae4b7d01699d0f3ea61bbef119f2d67e5455c0 (diff)
downloadlinux-73516a33588cde0bfa4742d857f8849da28bddd2.tar.xz
remoteproc: Add elf helpers to access elf64 and elf32 fields
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/remoteproc/remoteproc_elf_helpers.h96
1 files changed, 96 insertions, 0 deletions
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 */