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- // SPDX-License-Identifier: GPL-2.0
- // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
- #include <linux/moduleloader.h>
- #include <linux/elf.h>
- #include <linux/mm.h>
- #include <linux/vmalloc.h>
- #include <linux/slab.h>
- #include <linux/fs.h>
- #include <linux/string.h>
- #include <linux/kernel.h>
- #include <linux/spinlock.h>
- #ifdef CONFIG_CPU_CK810
- #define IS_BSR32(hi16, lo16) (((hi16) & 0xFC00) == 0xE000)
- #define IS_JSRI32(hi16, lo16) ((hi16) == 0xEAE0)
- #define CHANGE_JSRI_TO_LRW(addr) do { \
- *(uint16_t *)(addr) = (*(uint16_t *)(addr) & 0xFF9F) | 0x001a; \
- *((uint16_t *)(addr) + 1) = *((uint16_t *)(addr) + 1) & 0xFFFF; \
- } while (0)
- #define SET_JSR32_R26(addr) do { \
- *(uint16_t *)(addr) = 0xE8Fa; \
- *((uint16_t *)(addr) + 1) = 0x0000; \
- } while (0)
- static void jsri_2_lrw_jsr(uint32_t *location)
- {
- uint16_t *location_tmp = (uint16_t *)location;
- if (IS_BSR32(*location_tmp, *(location_tmp + 1)))
- return;
- if (IS_JSRI32(*location_tmp, *(location_tmp + 1))) {
- /* jsri 0x... --> lrw r26, 0x... */
- CHANGE_JSRI_TO_LRW(location);
- /* lsli r0, r0 --> jsr r26 */
- SET_JSR32_R26(location + 1);
- }
- }
- #else
- static void inline jsri_2_lrw_jsr(uint32_t *location)
- {
- return;
- }
- #endif
- int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
- unsigned int symindex, unsigned int relsec, struct module *me)
- {
- unsigned int i;
- Elf32_Rela *rel = (void *) sechdrs[relsec].sh_addr;
- Elf32_Sym *sym;
- uint32_t *location;
- short *temp;
- for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
- /* This is where to make the change */
- location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
- + rel[i].r_offset;
- sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
- + ELF32_R_SYM(rel[i].r_info);
- switch (ELF32_R_TYPE(rel[i].r_info)) {
- case R_CSKY_32:
- /* We add the value into the location given */
- *location = rel[i].r_addend + sym->st_value;
- break;
- case R_CSKY_PC32:
- /* Add the value, subtract its position */
- *location = rel[i].r_addend + sym->st_value
- - (uint32_t)location;
- break;
- case R_CSKY_PCRELJSR_IMM11BY2:
- break;
- case R_CSKY_PCRELJSR_IMM26BY2:
- jsri_2_lrw_jsr(location);
- break;
- case R_CSKY_ADDR_HI16:
- temp = ((short *)location) + 1;
- *temp = (short)
- ((rel[i].r_addend + sym->st_value) >> 16);
- break;
- case R_CSKY_ADDR_LO16:
- temp = ((short *)location) + 1;
- *temp = (short)
- ((rel[i].r_addend + sym->st_value) & 0xffff);
- break;
- default:
- pr_err("module %s: Unknown relocation: %u\n",
- me->name, ELF32_R_TYPE(rel[i].r_info));
- return -ENOEXEC;
- }
- }
- return 0;
- }
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