projects / mirror_ubuntu-hirsute-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 9d056df0 GR |
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> | |
| 9d056df0 | 13 | |
| f553aa1c | 14 | #ifdef CONFIG_CPU_CK810 |
| 9d056df0 GR |
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) | |
| f553aa1c GR |
27 | |
| 28 | static void jsri_2_lrw_jsr(uint32_t *location) | |
| 29 | { | |
| 70c25259 | 30 | uint16_t *location_tmp = (uint16_t *)location; |
| f553aa1c GR |
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 void inline jsri_2_lrw_jsr(uint32_t *location) | |
| 44 | { | |
| 45 | return; | |
| 46 | } | |
| 9d056df0 GR |
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; | |
| 9d056df0 GR |
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 postition */ | |
| 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: | |
| f553aa1c | 78 | jsri_2_lrw_jsr(location); |
| 9d056df0 GR |
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 | } |