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csky: ELF and module probe

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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>
This commit is contained in:
Guo Ren
2018-09-05 14:25:16 +08:00
parent a0ae62806f
commit 9d056df092
4 changed files with 246 additions and 0 deletions
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92
arch/csky/kernel/module.c Normal file
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@@ -0,0 +1,92 @@
// 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;
}