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73516a33 CL |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | /* | |
3 | * Remote processor elf helpers defines | |
4 | * | |
5 | * Copyright (C) 2020 Kalray, Inc. | |
6 | */ | |
7 | ||
8 | #ifndef REMOTEPROC_ELF_LOADER_H | |
9 | #define REMOTEPROC_ELF_LOADER_H | |
10 | ||
11 | #include <linux/elf.h> | |
12 | #include <linux/types.h> | |
13 | ||
14 | /** | |
15 | * fw_elf_get_class - Get elf class | |
16 | * @fw: the ELF firmware image | |
17 | * | |
18 | * Note that we use and elf32_hdr to access the class since the start of the | |
19 | * struct is the same for both elf class | |
20 | * | |
21 | * Return: elf class of the firmware | |
22 | */ | |
23 | static inline u8 fw_elf_get_class(const struct firmware *fw) | |
24 | { | |
25 | struct elf32_hdr *ehdr = (struct elf32_hdr *)fw->data; | |
26 | ||
27 | return ehdr->e_ident[EI_CLASS]; | |
28 | } | |
29 | ||
30 | static inline void elf_hdr_init_ident(struct elf32_hdr *hdr, u8 class) | |
31 | { | |
32 | memcpy(hdr->e_ident, ELFMAG, SELFMAG); | |
33 | hdr->e_ident[EI_CLASS] = class; | |
34 | hdr->e_ident[EI_DATA] = ELFDATA2LSB; | |
35 | hdr->e_ident[EI_VERSION] = EV_CURRENT; | |
36 | hdr->e_ident[EI_OSABI] = ELFOSABI_NONE; | |
37 | } | |
38 | ||
39 | /* Generate getter and setter for a specific elf struct/field */ | |
40 | #define ELF_GEN_FIELD_GET_SET(__s, __field, __type) \ | |
41 | static inline __type elf_##__s##_get_##__field(u8 class, const void *arg) \ | |
42 | { \ | |
43 | if (class == ELFCLASS32) \ | |
44 | return (__type) ((const struct elf32_##__s *) arg)->__field; \ | |
45 | else \ | |
46 | return (__type) ((const struct elf64_##__s *) arg)->__field; \ | |
47 | } \ | |
48 | static inline void elf_##__s##_set_##__field(u8 class, void *arg, \ | |
49 | __type value) \ | |
50 | { \ | |
51 | if (class == ELFCLASS32) \ | |
52 | ((struct elf32_##__s *) arg)->__field = (__type) value; \ | |
53 | else \ | |
54 | ((struct elf64_##__s *) arg)->__field = (__type) value; \ | |
55 | } | |
56 | ||
57 | ELF_GEN_FIELD_GET_SET(hdr, e_entry, u64) | |
58 | ELF_GEN_FIELD_GET_SET(hdr, e_phnum, u16) | |
59 | ELF_GEN_FIELD_GET_SET(hdr, e_shnum, u16) | |
60 | ELF_GEN_FIELD_GET_SET(hdr, e_phoff, u64) | |
61 | ELF_GEN_FIELD_GET_SET(hdr, e_shoff, u64) | |
62 | ELF_GEN_FIELD_GET_SET(hdr, e_shstrndx, u16) | |
63 | ELF_GEN_FIELD_GET_SET(hdr, e_machine, u16) | |
64 | ELF_GEN_FIELD_GET_SET(hdr, e_type, u16) | |
65 | ELF_GEN_FIELD_GET_SET(hdr, e_version, u32) | |
66 | ELF_GEN_FIELD_GET_SET(hdr, e_ehsize, u32) | |
67 | ELF_GEN_FIELD_GET_SET(hdr, e_phentsize, u16) | |
abc72b64 | 68 | ELF_GEN_FIELD_GET_SET(hdr, e_shentsize, u16) |
73516a33 CL |
69 | |
70 | ELF_GEN_FIELD_GET_SET(phdr, p_paddr, u64) | |
71 | ELF_GEN_FIELD_GET_SET(phdr, p_vaddr, u64) | |
72 | ELF_GEN_FIELD_GET_SET(phdr, p_filesz, u64) | |
73 | ELF_GEN_FIELD_GET_SET(phdr, p_memsz, u64) | |
74 | ELF_GEN_FIELD_GET_SET(phdr, p_type, u32) | |
75 | ELF_GEN_FIELD_GET_SET(phdr, p_offset, u64) | |
76 | ELF_GEN_FIELD_GET_SET(phdr, p_flags, u32) | |
77 | ELF_GEN_FIELD_GET_SET(phdr, p_align, u64) | |
78 | ||
abc72b64 SG |
79 | ELF_GEN_FIELD_GET_SET(shdr, sh_type, u32) |
80 | ELF_GEN_FIELD_GET_SET(shdr, sh_flags, u32) | |
81 | ELF_GEN_FIELD_GET_SET(shdr, sh_entsize, u16) | |
73516a33 CL |
82 | ELF_GEN_FIELD_GET_SET(shdr, sh_size, u64) |
83 | ELF_GEN_FIELD_GET_SET(shdr, sh_offset, u64) | |
84 | ELF_GEN_FIELD_GET_SET(shdr, sh_name, u32) | |
85 | ELF_GEN_FIELD_GET_SET(shdr, sh_addr, u64) | |
86 | ||
87 | #define ELF_STRUCT_SIZE(__s) \ | |
88 | static inline unsigned long elf_size_of_##__s(u8 class) \ | |
89 | { \ | |
90 | if (class == ELFCLASS32)\ | |
91 | return sizeof(struct elf32_##__s); \ | |
92 | else \ | |
93 | return sizeof(struct elf64_##__s); \ | |
94 | } | |
95 | ||
96 | ELF_STRUCT_SIZE(shdr) | |
97 | ELF_STRUCT_SIZE(phdr) | |
98 | ELF_STRUCT_SIZE(hdr) | |
99 | ||
abc72b64 SG |
100 | static inline unsigned int elf_strtbl_add(const char *name, void *ehdr, u8 class, size_t *index) |
101 | { | |
102 | u16 shstrndx = elf_hdr_get_e_shstrndx(class, ehdr); | |
103 | void *shdr; | |
104 | char *strtab; | |
105 | size_t idx, ret; | |
106 | ||
107 | shdr = ehdr + elf_size_of_hdr(class) + shstrndx * elf_size_of_shdr(class); | |
108 | strtab = ehdr + elf_shdr_get_sh_offset(class, shdr); | |
109 | idx = index ? *index : 0; | |
110 | if (!strtab || !name) | |
111 | return 0; | |
112 | ||
113 | ret = idx; | |
114 | strcpy((strtab + idx), name); | |
115 | idx += strlen(name) + 1; | |
116 | if (index) | |
117 | *index = idx; | |
118 | ||
119 | return ret; | |
120 | } | |
121 | ||
73516a33 | 122 | #endif /* REMOTEPROC_ELF_LOADER_H */ |