mirror of
https://github.com/edk2-porting/linux-next.git
synced 2025-01-01 10:13:58 +08:00
88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 as
|
||
|
|
* published by the Free Software Foundation.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/moduleloader.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/elf.h>
|
||
|
|
#include <linux/vmalloc.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
#include <linux/fs.h>
|
||
|
|
#include <linux/string.h>
|
||
|
|
|
||
|
|
static inline void arc_write_me(unsigned short *addr, unsigned long value)
|
||
|
|
{
|
||
|
|
*addr = (value & 0xffff0000) >> 16;
|
||
|
|
*(addr + 1) = (value & 0xffff);
|
||
|
|
}
|
||
|
|
|
||
|
|
int apply_relocate_add(Elf32_Shdr *sechdrs,
|
||
|
|
const char *strtab,
|
||
|
|
unsigned int symindex, /* sec index for sym tbl */
|
||
|
|
unsigned int relsec, /* sec index for relo sec */
|
||
|
|
struct module *module)
|
||
|
|
{
|
||
|
|
int i, n;
|
||
|
|
Elf32_Rela *rel_entry = (void *)sechdrs[relsec].sh_addr;
|
||
|
|
Elf32_Sym *sym_entry, *sym_sec;
|
||
|
|
Elf32_Addr relocation;
|
||
|
|
Elf32_Addr location;
|
||
|
|
Elf32_Addr sec_to_patch;
|
||
|
|
int relo_type;
|
||
|
|
|
||
|
|
sec_to_patch = sechdrs[sechdrs[relsec].sh_info].sh_addr;
|
||
|
|
sym_sec = (Elf32_Sym *) sechdrs[symindex].sh_addr;
|
||
|
|
n = sechdrs[relsec].sh_size / sizeof(*rel_entry);
|
||
|
|
|
||
|
|
pr_debug("\n========== Module Sym reloc ===========================\n");
|
||
|
|
pr_debug("Section to fixup %x\n", sec_to_patch);
|
||
|
|
pr_debug("=========================================================\n");
|
||
|
|
pr_debug("rela->r_off | rela->addend | sym->st_value | ADDR | VALUE\n");
|
||
|
|
pr_debug("=========================================================\n");
|
||
|
|
|
||
|
|
/* Loop thru entries in relocation section */
|
||
|
|
for (i = 0; i < n; i++) {
|
||
|
|
|
||
|
|
/* This is where to make the change */
|
||
|
|
location = sec_to_patch + rel_entry[i].r_offset;
|
||
|
|
|
||
|
|
/* This is the symbol it is referring to. Note that all
|
||
|
|
undefined symbols have been resolved. */
|
||
|
|
sym_entry = sym_sec + ELF32_R_SYM(rel_entry[i].r_info);
|
||
|
|
|
||
|
|
relocation = sym_entry->st_value + rel_entry[i].r_addend;
|
||
|
|
|
||
|
|
pr_debug("\t%x\t\t%x\t\t%x %x %x [%s]\n",
|
||
|
|
rel_entry[i].r_offset, rel_entry[i].r_addend,
|
||
|
|
sym_entry->st_value, location, relocation,
|
||
|
|
strtab + sym_entry->st_name);
|
||
|
|
|
||
|
|
/* This assumes modules are built with -mlong-calls
|
||
|
|
* so any branches/jumps are absolute 32 bit jmps
|
||
|
|
* global data access again is abs 32 bit.
|
||
|
|
* Both of these are handled by same relocation type
|
||
|
|
*/
|
||
|
|
relo_type = ELF32_R_TYPE(rel_entry[i].r_info);
|
||
|
|
|
||
|
|
if (likely(R_ARC_32_ME == relo_type))
|
||
|
|
arc_write_me((unsigned short *)location, relocation);
|
||
|
|
else if (R_ARC_32 == relo_type)
|
||
|
|
*((Elf32_Addr *) location) = relocation;
|
||
|
|
else
|
||
|
|
goto relo_err;
|
||
|
|
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
relo_err:
|
||
|
|
pr_err("%s: unknown relocation: %u\n",
|
||
|
|
module->name, ELF32_R_TYPE(rel_entry[i].r_info));
|
||
|
|
return -ENOEXEC;
|
||
|
|
|
||
|
|
}
|