93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#include <linux/moduleloader.h>
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#include <linux/elf.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/spinlock.h>
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#include <asm/pgtable.h>
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#if defined(__CSKYABIV2__)
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#define IS_BSR32(hi16, lo16) (((hi16) & 0xFC00) == 0xE000)
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#define IS_JSRI32(hi16, lo16) ((hi16) == 0xEAE0)
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#define CHANGE_JSRI_TO_LRW(addr) do { \
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*(uint16_t *)(addr) = (*(uint16_t *)(addr) & 0xFF9F) | 0x001a; \
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*((uint16_t *)(addr) + 1) = *((uint16_t *)(addr) + 1) & 0xFFFF; \
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} while (0)
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#define SET_JSR32_R26(addr) do { \
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*(uint16_t *)(addr) = 0xE8Fa; \
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*((uint16_t *)(addr) + 1) = 0x0000; \
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} while (0)
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#endif
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int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
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unsigned int symindex, unsigned int relsec, struct module *me)
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{
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unsigned int i;
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Elf32_Rela *rel = (void *) sechdrs[relsec].sh_addr;
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Elf32_Sym *sym;
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uint32_t *location;
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short *temp;
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#if defined(__CSKYABIV2__)
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uint16_t *location_tmp;
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#endif
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for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
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/* This is where to make the change */
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location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
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+ rel[i].r_offset;
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sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
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+ ELF32_R_SYM(rel[i].r_info);
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switch (ELF32_R_TYPE(rel[i].r_info)) {
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case R_CSKY_32:
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/* We add the value into the location given */
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*location = rel[i].r_addend + sym->st_value;
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break;
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case R_CSKY_PC32:
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/* Add the value, subtract its postition */
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*location = rel[i].r_addend + sym->st_value
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- (uint32_t)location;
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break;
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case R_CSKY_PCRELJSR_IMM11BY2:
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break;
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case R_CSKY_PCRELJSR_IMM26BY2:
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#if defined(__CSKYABIV2__)
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location_tmp = (uint16_t *)location;
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if (IS_BSR32(*location_tmp, *(location_tmp + 1)))
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break;
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if (IS_JSRI32(*location_tmp, *(location_tmp + 1))) {
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/* jsri 0x... --> lrw r26, 0x... */
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CHANGE_JSRI_TO_LRW(location);
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/* lsli r0, r0 --> jsr r26 */
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SET_JSR32_R26(location + 1);
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}
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#endif
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break;
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case R_CSKY_ADDR_HI16:
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temp = ((short *)location) + 1;
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*temp = (short)
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((rel[i].r_addend + sym->st_value) >> 16);
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break;
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case R_CSKY_ADDR_LO16:
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temp = ((short *)location) + 1;
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*temp = (short)
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((rel[i].r_addend + sym->st_value) & 0xffff);
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break;
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default:
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pr_err("module %s: Unknown relocation: %u\n",
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me->name, ELF32_R_TYPE(rel[i].r_info));
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return -ENOEXEC;
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}
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}
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return 0;
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}
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