1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. |
3 | |
4 | #include <linux/moduleloader.h> |
5 | #include <linux/elf.h> |
6 | #include <linux/mm.h> |
7 | #include <linux/vmalloc.h> |
8 | #include <linux/slab.h> |
9 | #include <linux/fs.h> |
10 | #include <linux/string.h> |
11 | #include <linux/kernel.h> |
12 | #include <linux/spinlock.h> |
13 | |
14 | #ifdef CONFIG_CPU_CK810 |
15 | #define IS_BSR32(hi16, lo16) (((hi16) & 0xFC00) == 0xE000) |
16 | #define IS_JSRI32(hi16, lo16) ((hi16) == 0xEAE0) |
17 | |
18 | #define CHANGE_JSRI_TO_LRW(addr) do { \ |
19 | *(uint16_t *)(addr) = (*(uint16_t *)(addr) & 0xFF9F) | 0x001a; \ |
20 | *((uint16_t *)(addr) + 1) = *((uint16_t *)(addr) + 1) & 0xFFFF; \ |
21 | } while (0) |
22 | |
23 | #define SET_JSR32_R26(addr) do { \ |
24 | *(uint16_t *)(addr) = 0xE8Fa; \ |
25 | *((uint16_t *)(addr) + 1) = 0x0000; \ |
26 | } while (0) |
27 | |
28 | static void jsri_2_lrw_jsr(uint32_t *location) |
29 | { |
30 | uint16_t *location_tmp = (uint16_t *)location; |
31 | |
32 | if (IS_BSR32(*location_tmp, *(location_tmp + 1))) |
33 | return; |
34 | |
35 | if (IS_JSRI32(*location_tmp, *(location_tmp + 1))) { |
36 | /* jsri 0x... --> lrw r26, 0x... */ |
37 | CHANGE_JSRI_TO_LRW(location); |
38 | /* lsli r0, r0 --> jsr r26 */ |
39 | SET_JSR32_R26(location + 1); |
40 | } |
41 | } |
42 | #else |
43 | static inline void jsri_2_lrw_jsr(uint32_t *location) |
44 | { |
45 | return; |
46 | } |
47 | #endif |
48 | |
49 | int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, |
50 | unsigned int symindex, unsigned int relsec, struct module *me) |
51 | { |
52 | unsigned int i; |
53 | Elf32_Rela *rel = (void *) sechdrs[relsec].sh_addr; |
54 | Elf32_Sym *sym; |
55 | uint32_t *location; |
56 | short *temp; |
57 | |
58 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { |
59 | /* This is where to make the change */ |
60 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr |
61 | + rel[i].r_offset; |
62 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr |
63 | + ELF32_R_SYM(rel[i].r_info); |
64 | |
65 | switch (ELF32_R_TYPE(rel[i].r_info)) { |
66 | case R_CSKY_32: |
67 | /* We add the value into the location given */ |
68 | *location = rel[i].r_addend + sym->st_value; |
69 | break; |
70 | case R_CSKY_PC32: |
71 | /* Add the value, subtract its position */ |
72 | *location = rel[i].r_addend + sym->st_value |
73 | - (uint32_t)location; |
74 | break; |
75 | case R_CSKY_PCRELJSR_IMM11BY2: |
76 | break; |
77 | case R_CSKY_PCRELJSR_IMM26BY2: |
78 | jsri_2_lrw_jsr(location); |
79 | break; |
80 | case R_CSKY_ADDR_HI16: |
81 | temp = ((short *)location) + 1; |
82 | *temp = (short) |
83 | ((rel[i].r_addend + sym->st_value) >> 16); |
84 | break; |
85 | case R_CSKY_ADDR_LO16: |
86 | temp = ((short *)location) + 1; |
87 | *temp = (short) |
88 | ((rel[i].r_addend + sym->st_value) & 0xffff); |
89 | break; |
90 | default: |
91 | pr_err("module %s: Unknown relocation: %u\n" , |
92 | me->name, ELF32_R_TYPE(rel[i].r_info)); |
93 | return -ENOEXEC; |
94 | } |
95 | } |
96 | return 0; |
97 | } |
98 | |