mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 10:40:15 +02:00
9d056df092
This patch adds ELF definition and module relocate codes. Signed-off-by: Guo Ren <ren_guo@c-sky.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
// 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>
|
|
#include <asm/pgtable.h>
|
|
|
|
#if defined(__CSKYABIV2__)
|
|
#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)
|
|
#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;
|
|
#if defined(__CSKYABIV2__)
|
|
uint16_t *location_tmp;
|
|
#endif
|
|
|
|
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 postition */
|
|
*location = rel[i].r_addend + sym->st_value
|
|
- (uint32_t)location;
|
|
break;
|
|
case R_CSKY_PCRELJSR_IMM11BY2:
|
|
break;
|
|
case R_CSKY_PCRELJSR_IMM26BY2:
|
|
#if defined(__CSKYABIV2__)
|
|
location_tmp = (uint16_t *)location;
|
|
if (IS_BSR32(*location_tmp, *(location_tmp + 1)))
|
|
break;
|
|
|
|
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);
|
|
}
|
|
#endif
|
|
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;
|
|
}
|