mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-24 21:28:03 +07:00
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>
204 lines
6.2 KiB
C
204 lines
6.2 KiB
C
/* Kernel module help for M32R.
|
|
|
|
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
|
|
*/
|
|
|
|
#include <linux/moduleloader.h>
|
|
#include <linux/elf.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/string.h>
|
|
#include <linux/kernel.h>
|
|
|
|
#if 0
|
|
#define DEBUGP printk
|
|
#else
|
|
#define DEBUGP(fmt...)
|
|
#endif
|
|
|
|
#define COPY_UNALIGNED_WORD(sw, tw, align) \
|
|
{ \
|
|
void *__s = &(sw), *__t = &(tw); \
|
|
unsigned short *__s2 = __s, *__t2 =__t; \
|
|
unsigned char *__s1 = __s, *__t1 =__t; \
|
|
switch ((align)) \
|
|
{ \
|
|
case 0: \
|
|
*(unsigned long *) __t = *(unsigned long *) __s; \
|
|
break; \
|
|
case 2: \
|
|
*__t2++ = *__s2++; \
|
|
*__t2 = *__s2; \
|
|
break; \
|
|
default: \
|
|
*__t1++ = *__s1++; \
|
|
*__t1++ = *__s1++; \
|
|
*__t1++ = *__s1++; \
|
|
*__t1 = *__s1; \
|
|
break; \
|
|
} \
|
|
}
|
|
|
|
#define COPY_UNALIGNED_HWORD(sw, tw, align) \
|
|
{ \
|
|
void *__s = &(sw), *__t = &(tw); \
|
|
unsigned short *__s2 = __s, *__t2 =__t; \
|
|
unsigned char *__s1 = __s, *__t1 =__t; \
|
|
switch ((align)) \
|
|
{ \
|
|
case 0: \
|
|
*__t2 = *__s2; \
|
|
break; \
|
|
default: \
|
|
*__t1++ = *__s1++; \
|
|
*__t1 = *__s1; \
|
|
break; \
|
|
} \
|
|
}
|
|
|
|
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;
|
|
Elf32_Addr relocation;
|
|
uint32_t *location;
|
|
uint32_t value;
|
|
unsigned short *hlocation;
|
|
unsigned short hvalue;
|
|
int svalue;
|
|
int align;
|
|
|
|
DEBUGP("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. Note that all
|
|
undefined symbols have been resolved. */
|
|
sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
|
|
+ ELF32_R_SYM(rel[i].r_info);
|
|
relocation = sym->st_value + rel[i].r_addend;
|
|
align = (int)location & 3;
|
|
|
|
switch (ELF32_R_TYPE(rel[i].r_info)) {
|
|
case R_M32R_32_RELA:
|
|
COPY_UNALIGNED_WORD (*location, value, align);
|
|
value += relocation;
|
|
COPY_UNALIGNED_WORD (value, *location, align);
|
|
break;
|
|
case R_M32R_HI16_ULO_RELA:
|
|
COPY_UNALIGNED_WORD (*location, value, align);
|
|
relocation = (relocation >>16) & 0xffff;
|
|
/* RELA must has 0 at relocation field. */
|
|
value += relocation;
|
|
COPY_UNALIGNED_WORD (value, *location, align);
|
|
break;
|
|
case R_M32R_HI16_SLO_RELA:
|
|
COPY_UNALIGNED_WORD (*location, value, align);
|
|
if (relocation & 0x8000) relocation += 0x10000;
|
|
relocation = (relocation >>16) & 0xffff;
|
|
/* RELA must has 0 at relocation field. */
|
|
value += relocation;
|
|
COPY_UNALIGNED_WORD (value, *location, align);
|
|
break;
|
|
case R_M32R_16_RELA:
|
|
hlocation = (unsigned short *)location;
|
|
relocation = relocation & 0xffff;
|
|
/* RELA must has 0 at relocation field. */
|
|
hvalue = relocation;
|
|
COPY_UNALIGNED_WORD (hvalue, *hlocation, align);
|
|
break;
|
|
case R_M32R_SDA16_RELA:
|
|
case R_M32R_LO16_RELA:
|
|
COPY_UNALIGNED_WORD (*location, value, align);
|
|
relocation = relocation & 0xffff;
|
|
/* RELA must has 0 at relocation field. */
|
|
value += relocation;
|
|
COPY_UNALIGNED_WORD (value, *location, align);
|
|
break;
|
|
case R_M32R_24_RELA:
|
|
COPY_UNALIGNED_WORD (*location, value, align);
|
|
relocation = relocation & 0xffffff;
|
|
/* RELA must has 0 at relocation field. */
|
|
value += relocation;
|
|
COPY_UNALIGNED_WORD (value, *location, align);
|
|
break;
|
|
case R_M32R_18_PCREL_RELA:
|
|
relocation = (relocation - (Elf32_Addr) location);
|
|
if (relocation < -0x20000 || 0x1fffc < relocation)
|
|
{
|
|
printk(KERN_ERR "module %s: relocation overflow: %u\n",
|
|
me->name, relocation);
|
|
return -ENOEXEC;
|
|
}
|
|
COPY_UNALIGNED_WORD (*location, value, align);
|
|
if (value & 0xffff)
|
|
{
|
|
/* RELA must has 0 at relocation field. */
|
|
printk(KERN_ERR "module %s: illegal relocation field: %u\n",
|
|
me->name, value);
|
|
return -ENOEXEC;
|
|
}
|
|
relocation = (relocation >> 2) & 0xffff;
|
|
value += relocation;
|
|
COPY_UNALIGNED_WORD (value, *location, align);
|
|
break;
|
|
case R_M32R_10_PCREL_RELA:
|
|
hlocation = (unsigned short *)location;
|
|
relocation = (relocation - (Elf32_Addr) location);
|
|
COPY_UNALIGNED_HWORD (*hlocation, hvalue, align);
|
|
svalue = (int)hvalue;
|
|
svalue = (signed char)svalue << 2;
|
|
relocation += svalue;
|
|
relocation = (relocation >> 2) & 0xff;
|
|
hvalue = hvalue & 0xff00;
|
|
hvalue += relocation;
|
|
COPY_UNALIGNED_HWORD (hvalue, *hlocation, align);
|
|
break;
|
|
case R_M32R_26_PCREL_RELA:
|
|
relocation = (relocation - (Elf32_Addr) location);
|
|
if (relocation < -0x2000000 || 0x1fffffc < relocation)
|
|
{
|
|
printk(KERN_ERR "module %s: relocation overflow: %u\n",
|
|
me->name, relocation);
|
|
return -ENOEXEC;
|
|
}
|
|
COPY_UNALIGNED_WORD (*location, value, align);
|
|
if (value & 0xffffff)
|
|
{
|
|
/* RELA must has 0 at relocation field. */
|
|
printk(KERN_ERR "module %s: illegal relocation field: %u\n",
|
|
me->name, value);
|
|
return -ENOEXEC;
|
|
}
|
|
relocation = (relocation >> 2) & 0xffffff;
|
|
value += relocation;
|
|
COPY_UNALIGNED_WORD (value, *location, align);
|
|
break;
|
|
default:
|
|
printk(KERN_ERR "module %s: Unknown relocation: %u\n",
|
|
me->name, ELF32_R_TYPE(rel[i].r_info));
|
|
return -ENOEXEC;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|