forked from luck/tmp_suning_uos_patched
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
275 lines
6.2 KiB
C
275 lines
6.2 KiB
C
/*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
* Copyright (C) 2001 Rusty Russell.
|
|
* Copyright (C) 2003, 2004 Ralf Baechle (ralf@linux-mips.org)
|
|
*/
|
|
|
|
#undef DEBUG
|
|
|
|
#include <linux/moduleloader.h>
|
|
#include <linux/elf.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/string.h>
|
|
#include <linux/kernel.h>
|
|
|
|
struct mips_hi16 {
|
|
struct mips_hi16 *next;
|
|
Elf32_Addr *addr;
|
|
Elf64_Addr value;
|
|
};
|
|
|
|
static struct mips_hi16 *mips_hi16_list;
|
|
|
|
void *module_alloc(unsigned long size)
|
|
{
|
|
if (size == 0)
|
|
return NULL;
|
|
return vmalloc(size);
|
|
}
|
|
|
|
|
|
/* Free memory returned from module_alloc */
|
|
void module_free(struct module *mod, void *module_region)
|
|
{
|
|
vfree(module_region);
|
|
/* FIXME: If module_region == mod->init_region, trim exception
|
|
table entries. */
|
|
}
|
|
|
|
int module_frob_arch_sections(Elf_Ehdr *hdr,
|
|
Elf_Shdr *sechdrs,
|
|
char *secstrings,
|
|
struct module *mod)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int apply_relocate(Elf64_Shdr *sechdrs,
|
|
const char *strtab,
|
|
unsigned int symindex,
|
|
unsigned int relsec,
|
|
struct module *me)
|
|
{
|
|
/*
|
|
* We don't want to deal with REL relocations - RELA is so much saner.
|
|
*/
|
|
if (!sechdrs[relsec].sh_size)
|
|
return 0;
|
|
|
|
printk(KERN_ERR "module %s: REL relocation unsupported\n",
|
|
me->name);
|
|
return -ENOEXEC;
|
|
}
|
|
|
|
static int apply_r_mips_none(struct module *me, uint32_t *location,
|
|
Elf64_Addr v)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int apply_r_mips_32(struct module *me, uint32_t *location,
|
|
Elf64_Addr v)
|
|
{
|
|
*location = v;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int apply_r_mips_26(struct module *me, uint32_t *location,
|
|
Elf64_Addr v)
|
|
{
|
|
if (v % 4) {
|
|
printk(KERN_ERR "module %s: dangerous relocation\n", me->name);
|
|
return -ENOEXEC;
|
|
}
|
|
|
|
if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
|
|
printk(KERN_ERR
|
|
"module %s: relocation overflow\n",
|
|
me->name);
|
|
return -ENOEXEC;
|
|
}
|
|
|
|
*location = (*location & ~0x03ffffff) | ((v >> 2) & 0x03ffffff);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int apply_r_mips_hi16(struct module *me, uint32_t *location,
|
|
Elf64_Addr v)
|
|
{
|
|
struct mips_hi16 *n;
|
|
|
|
/*
|
|
* We cannot relocate this one now because we don't know the value of
|
|
* the carry we need to add. Save the information, and let LO16 do the
|
|
* actual relocation.
|
|
*/
|
|
n = kmalloc(sizeof *n, GFP_KERNEL);
|
|
if (!n)
|
|
return -ENOMEM;
|
|
|
|
n->addr = location;
|
|
n->value = v;
|
|
n->next = mips_hi16_list;
|
|
mips_hi16_list = n;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int apply_r_mips_lo16(struct module *me, uint32_t *location,
|
|
Elf64_Addr v)
|
|
{
|
|
unsigned long insnlo = *location;
|
|
Elf32_Addr val, vallo;
|
|
|
|
/* Sign extend the addend we extract from the lo insn. */
|
|
vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
|
|
|
|
if (mips_hi16_list != NULL) {
|
|
struct mips_hi16 *l;
|
|
|
|
l = mips_hi16_list;
|
|
while (l != NULL) {
|
|
struct mips_hi16 *next;
|
|
unsigned long insn;
|
|
|
|
/*
|
|
* The value for the HI16 had best be the same.
|
|
*/
|
|
if (v != l->value)
|
|
goto out_danger;
|
|
|
|
/*
|
|
* Do the HI16 relocation. Note that we actually don't
|
|
* need to know anything about the LO16 itself, except
|
|
* where to find the low 16 bits of the addend needed
|
|
* by the LO16.
|
|
*/
|
|
insn = *l->addr;
|
|
val = ((insn & 0xffff) << 16) + vallo;
|
|
val += v;
|
|
|
|
/*
|
|
* Account for the sign extension that will happen in
|
|
* the low bits.
|
|
*/
|
|
val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff;
|
|
|
|
insn = (insn & ~0xffff) | val;
|
|
*l->addr = insn;
|
|
|
|
next = l->next;
|
|
kfree(l);
|
|
l = next;
|
|
}
|
|
|
|
mips_hi16_list = NULL;
|
|
}
|
|
|
|
/*
|
|
* Ok, we're done with the HI16 relocs. Now deal with the LO16.
|
|
*/
|
|
insnlo = (insnlo & ~0xffff) | (v & 0xffff);
|
|
*location = insnlo;
|
|
|
|
return 0;
|
|
|
|
out_danger:
|
|
printk(KERN_ERR "module %s: dangerous " "relocation\n", me->name);
|
|
|
|
return -ENOEXEC;
|
|
}
|
|
|
|
static int apply_r_mips_64(struct module *me, uint32_t *location,
|
|
Elf64_Addr v)
|
|
{
|
|
*(uint64_t *) location = v;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int apply_r_mips_higher(struct module *me, uint32_t *location,
|
|
Elf64_Addr v)
|
|
{
|
|
*location = (*location & 0xffff0000) |
|
|
((((long long) v + 0x80008000LL) >> 32) & 0xffff);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int apply_r_mips_highest(struct module *me, uint32_t *location,
|
|
Elf64_Addr v)
|
|
{
|
|
*location = (*location & 0xffff0000) |
|
|
((((long long) v + 0x800080008000LL) >> 48) & 0xffff);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int (*reloc_handlers[]) (struct module *me, uint32_t *location,
|
|
Elf64_Addr v) = {
|
|
[R_MIPS_NONE] = apply_r_mips_none,
|
|
[R_MIPS_32] = apply_r_mips_32,
|
|
[R_MIPS_26] = apply_r_mips_26,
|
|
[R_MIPS_HI16] = apply_r_mips_hi16,
|
|
[R_MIPS_LO16] = apply_r_mips_lo16,
|
|
[R_MIPS_64] = apply_r_mips_64,
|
|
[R_MIPS_HIGHER] = apply_r_mips_higher,
|
|
[R_MIPS_HIGHEST] = apply_r_mips_highest
|
|
};
|
|
|
|
int apply_relocate_add(Elf64_Shdr *sechdrs,
|
|
const char *strtab,
|
|
unsigned int symindex,
|
|
unsigned int relsec,
|
|
struct module *me)
|
|
{
|
|
Elf64_Mips_Rela *rel = (void *) sechdrs[relsec].sh_addr;
|
|
Elf64_Sym *sym;
|
|
uint32_t *location;
|
|
unsigned int i;
|
|
Elf64_Addr v;
|
|
int res;
|
|
|
|
pr_debug("Applying relocate section %u to %u\n", relsec,
|
|
sechdrs[relsec].sh_info);
|
|
|
|
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;
|
|
/* This is the symbol it is referring to */
|
|
sym = (Elf64_Sym *)sechdrs[symindex].sh_addr + rel[i].r_sym;
|
|
if (!sym->st_value) {
|
|
printk(KERN_WARNING "%s: Unknown symbol %s\n",
|
|
me->name, strtab + sym->st_name);
|
|
return -ENOENT;
|
|
}
|
|
|
|
v = sym->st_value;
|
|
|
|
res = reloc_handlers[rel[i].r_type](me, location, v);
|
|
if (res)
|
|
return res;
|
|
}
|
|
|
|
return 0;
|
|
}
|