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git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blob - arch/csky/kernel/module.c
1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
4 #include <linux/moduleloader.h>
7 #include <linux/vmalloc.h>
8 #include <linux/slab.h>
10 #include <linux/string.h>
11 #include <linux/kernel.h>
12 #include <linux/spinlock.h>
13 #include <asm/pgtable.h>
15 #if defined(__CSKYABIV2__)
16 #define IS_BSR32(hi16, lo16) (((hi16) & 0xFC00) == 0xE000)
17 #define IS_JSRI32(hi16, lo16) ((hi16) == 0xEAE0)
19 #define CHANGE_JSRI_TO_LRW(addr) do { \
20 *(uint16_t *)(addr) = (*(uint16_t *)(addr) & 0xFF9F) | 0x001a; \
21 *((uint16_t *)(addr) + 1) = *((uint16_t *)(addr) + 1) & 0xFFFF; \
24 #define SET_JSR32_R26(addr) do { \
25 *(uint16_t *)(addr) = 0xE8Fa; \
26 *((uint16_t *)(addr) + 1) = 0x0000; \
30 int apply_relocate_add(Elf32_Shdr
*sechdrs
, const char *strtab
,
31 unsigned int symindex
, unsigned int relsec
, struct module
*me
)
34 Elf32_Rela
*rel
= (void *) sechdrs
[relsec
].sh_addr
;
38 #if defined(__CSKYABIV2__)
39 uint16_t *location_tmp
;
42 for (i
= 0; i
< sechdrs
[relsec
].sh_size
/ sizeof(*rel
); i
++) {
43 /* This is where to make the change */
44 location
= (void *)sechdrs
[sechdrs
[relsec
].sh_info
].sh_addr
46 sym
= (Elf32_Sym
*)sechdrs
[symindex
].sh_addr
47 + ELF32_R_SYM(rel
[i
].r_info
);
49 switch (ELF32_R_TYPE(rel
[i
].r_info
)) {
51 /* We add the value into the location given */
52 *location
= rel
[i
].r_addend
+ sym
->st_value
;
55 /* Add the value, subtract its postition */
56 *location
= rel
[i
].r_addend
+ sym
->st_value
59 case R_CSKY_PCRELJSR_IMM11BY2
:
61 case R_CSKY_PCRELJSR_IMM26BY2
:
62 #if defined(__CSKYABIV2__)
63 location_tmp
= (uint16_t *)location
;
64 if (IS_BSR32(*location_tmp
, *(location_tmp
+ 1)))
67 if (IS_JSRI32(*location_tmp
, *(location_tmp
+ 1))) {
68 /* jsri 0x... --> lrw r26, 0x... */
69 CHANGE_JSRI_TO_LRW(location
);
70 /* lsli r0, r0 --> jsr r26 */
71 SET_JSR32_R26(location
+ 1);
75 case R_CSKY_ADDR_HI16
:
76 temp
= ((short *)location
) + 1;
78 ((rel
[i
].r_addend
+ sym
->st_value
) >> 16);
80 case R_CSKY_ADDR_LO16
:
81 temp
= ((short *)location
) + 1;
83 ((rel
[i
].r_addend
+ sym
->st_value
) & 0xffff);
86 pr_err("module %s: Unknown relocation: %u\n",
87 me
->name
, ELF32_R_TYPE(rel
[i
].r_info
));