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 void inline 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