mirror of
https://github.com/torvalds/linux.git
synced 2024-10-31 17:21:49 +00:00
786d35d45c
Use the mapping of Elf_[SPE]hdr, Elf_Addr, Elf_Sym, Elf_Dyn, Elf_Rel/Rela,
ELF_R_TYPE() and ELF_R_SYM() to either the 32-bit version or the 64-bit version
into asm-generic/module.h for all arches bar MIPS.
Also, use the generic definition mod_arch_specific where possible.
To this end, I've defined three new config bools:
(*) HAVE_MOD_ARCH_SPECIFIC
Arches define this if they don't want to use the empty generic
mod_arch_specific struct.
(*) MODULES_USE_ELF_RELA
Arches define this if their modules can contain RELA records. This causes
the Elf_Rela mapping to be emitted and allows apply_relocate_add() to be
defined by the arch rather than have the core emit an error message.
(*) MODULES_USE_ELF_REL
Arches define this if their modules can contain REL records. This causes
the Elf_Rel mapping to be emitted and allows apply_relocate() to be
defined by the arch rather than have the core emit an error message.
Note that it is possible to allow both REL and RELA records: m68k and mips are
two arches that do this.
With this, some arch asm/module.h files can be deleted entirely and replaced
with a generic-y marker in the arch Kbuild file.
Additionally, I have removed the bits from m32r and score that handle the
unsupported type of relocation record as that's now handled centrally.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
133 lines
3.8 KiB
C
133 lines
3.8 KiB
C
/*
|
|
* arch/score/kernel/module.c
|
|
*
|
|
* Score Processor version.
|
|
*
|
|
* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
|
|
* Chen Liqin <liqin.chen@sunplusct.com>
|
|
* Lennox Wu <lennox.wu@sunplusct.com>
|
|
*
|
|
* 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, see the file COPYING, or write
|
|
* to the Free Software Foundation, Inc.,
|
|
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include <linux/moduleloader.h>
|
|
#include <linux/module.h>
|
|
#include <linux/vmalloc.h>
|
|
|
|
int apply_relocate(Elf_Shdr *sechdrs, const char *strtab,
|
|
unsigned int symindex, unsigned int relindex,
|
|
struct module *me)
|
|
{
|
|
Elf32_Shdr *symsec = sechdrs + symindex;
|
|
Elf32_Shdr *relsec = sechdrs + relindex;
|
|
Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
|
|
Elf32_Rel *rel = (void *)relsec->sh_addr;
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
|
|
unsigned long loc;
|
|
Elf32_Sym *sym;
|
|
s32 r_offset;
|
|
|
|
r_offset = ELF32_R_SYM(rel->r_info);
|
|
if ((r_offset < 0) ||
|
|
(r_offset > (symsec->sh_size / sizeof(Elf32_Sym)))) {
|
|
printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n",
|
|
me->name, relindex, i);
|
|
return -ENOEXEC;
|
|
}
|
|
|
|
sym = ((Elf32_Sym *)symsec->sh_addr) + r_offset;
|
|
|
|
if ((rel->r_offset < 0) ||
|
|
(rel->r_offset > dstsec->sh_size - sizeof(u32))) {
|
|
printk(KERN_ERR "%s: out of bounds relocation, "
|
|
"section %d reloc %d offset %d size %d\n",
|
|
me->name, relindex, i, rel->r_offset,
|
|
dstsec->sh_size);
|
|
return -ENOEXEC;
|
|
}
|
|
|
|
loc = dstsec->sh_addr + rel->r_offset;
|
|
switch (ELF32_R_TYPE(rel->r_info)) {
|
|
case R_SCORE_NONE:
|
|
break;
|
|
case R_SCORE_ABS32:
|
|
*(unsigned long *)loc += sym->st_value;
|
|
break;
|
|
case R_SCORE_HI16:
|
|
break;
|
|
case R_SCORE_LO16: {
|
|
unsigned long hi16_offset, offset;
|
|
unsigned long uvalue;
|
|
unsigned long temp, temp_hi;
|
|
temp_hi = *((unsigned long *)loc - 1);
|
|
temp = *(unsigned long *)loc;
|
|
|
|
hi16_offset = (((((temp_hi) >> 16) & 0x3) << 15) |
|
|
((temp_hi) & 0x7fff)) >> 1;
|
|
offset = ((temp >> 16 & 0x03) << 15) |
|
|
((temp & 0x7fff) >> 1);
|
|
offset = (hi16_offset << 16) | (offset & 0xffff);
|
|
uvalue = sym->st_value + offset;
|
|
hi16_offset = (uvalue >> 16) << 1;
|
|
|
|
temp_hi = ((temp_hi) & (~(0x37fff))) |
|
|
(hi16_offset & 0x7fff) |
|
|
((hi16_offset << 1) & 0x30000);
|
|
*((unsigned long *)loc - 1) = temp_hi;
|
|
|
|
offset = (uvalue & 0xffff) << 1;
|
|
temp = (temp & (~(0x37fff))) | (offset & 0x7fff) |
|
|
((offset << 1) & 0x30000);
|
|
*(unsigned long *)loc = temp;
|
|
break;
|
|
}
|
|
case R_SCORE_24: {
|
|
unsigned long hi16_offset, offset;
|
|
unsigned long uvalue;
|
|
unsigned long temp;
|
|
|
|
temp = *(unsigned long *)loc;
|
|
offset = (temp & 0x03FF7FFE);
|
|
hi16_offset = (offset & 0xFFFF0000);
|
|
offset = (hi16_offset | ((offset & 0xFFFF) << 1)) >> 2;
|
|
|
|
uvalue = (sym->st_value + offset) >> 1;
|
|
uvalue = uvalue & 0x00ffffff;
|
|
|
|
temp = (temp & 0xfc008001) |
|
|
((uvalue << 2) & 0x3ff0000) |
|
|
((uvalue & 0x3fff) << 1);
|
|
*(unsigned long *)loc = temp;
|
|
break;
|
|
}
|
|
default:
|
|
printk(KERN_ERR "%s: unknown relocation: %u\n",
|
|
me->name, ELF32_R_TYPE(rel->r_info));
|
|
return -ENOEXEC;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Given an address, look for it in the module exception tables. */
|
|
const struct exception_table_entry *search_module_dbetables(unsigned long addr)
|
|
{
|
|
return NULL;
|
|
}
|