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m68k: runtime patching infrastructure

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Add the basic infrastructure to allow runtime patching of kernel and modules
to optimize a few functions with parameters, which are only calculated once
during bootup and are otherwise constant.  Use this for the conversion between
virtual and physical addresses.

Signed-off-by: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Roman Zippel
2007-05-31 00:40:50 -07:00
committed by Linus Torvalds
parent 1fc799e1b4
commit fbe9c96129
9 changed files with 107 additions and 7 deletions
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3
arch/m68k/kernel/Makefile
View File

@@ -9,13 +9,12 @@ else
endif
extra-y += vmlinux.lds
obj-y := entry.o process.o traps.o ints.o signal.o ptrace.o \
obj-y := entry.o process.o traps.o ints.o signal.o ptrace.o module.o \
sys_m68k.o time.o semaphore.o setup.o m68k_ksyms.o devres.o
devres-y = ../../../kernel/irq/devres.o
obj-$(CONFIG_PCI) += bios32.o
obj-$(CONFIG_MODULES) += module.o
obj-y$(CONFIG_MMU_SUN3) += dma.o # no, it's not a typo
EXTRA_AFLAGS := -traditional

28
arch/m68k/kernel/module.c
View File

@@ -1,3 +1,9 @@
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*/
#include <linux/moduleloader.h>
#include <linux/elf.h>
#include <linux/vmalloc.h>
@@ -11,6 +17,8 @@
#define DEBUGP(fmt...)
#endif
#ifdef CONFIG_MODULES
void *module_alloc(unsigned long size)
{
if (size == 0)
@@ -118,11 +126,29 @@ int apply_relocate_add(Elf32_Shdr *sechdrs,
int module_finalize(const Elf_Ehdr *hdr,
const Elf_Shdr *sechdrs,
struct module *me)
struct module *mod)
{
module_fixup(mod, mod->arch.fixup_start, mod->arch.fixup_end);
return 0;
}
void module_arch_cleanup(struct module *mod)
{
}
#endif /* CONFIG_MODULES */
void module_fixup(struct module *mod, struct m68k_fixup_info *start,
struct m68k_fixup_info *end)
{
struct m68k_fixup_info *fixup;
for (fixup = start; fixup < end; fixup++) {
switch (fixup->type) {
case m68k_fixup_memoffset:
*(u32 *)fixup->addr = m68k_memoffset;
break;
}
}
}

7
arch/m68k/kernel/module.lds Normal file
View File

@@ -0,0 +1,7 @@
SECTIONS {
.m68k_fixup : {
__start_fixup = .;
*(.m68k_fixup)
__stop_fixup = .;
}
}

5
arch/m68k/kernel/vmlinux-std.lds
View File

@@ -60,6 +60,11 @@ SECTIONS
__con_initcall_start = .;
.con_initcall.init : { *(.con_initcall.init) }
__con_initcall_end = .;
.m68k_fixup : {
__start_fixup = .;
*(.m68k_fixup)
__stop_fixup = .;
}
SECURITY_INIT
#ifdef CONFIG_BLK_DEV_INITRD
. = ALIGN(8192);

5
arch/m68k/kernel/vmlinux-sun3.lds
View File

@@ -54,6 +54,11 @@ __init_begin = .;
__con_initcall_start = .;
.con_initcall.init : { *(.con_initcall.init) }
__con_initcall_end = .;
.m68k_fixup : {
__start_fixup = .;
*(.m68k_fixup)
__stop_fixup = .;
}
SECURITY_INIT
#ifdef CONFIG_BLK_DEV_INITRD
. = ALIGN(8192);