m68k: runtime patching infrastructure
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>
diff --git a/arch/m68k/kernel/Makefile b/arch/m68k/kernel/Makefile
index 0b68ab8..a806208 100644
--- a/arch/m68k/kernel/Makefile
+++ b/arch/m68k/kernel/Makefile
@@ -9,13 +9,12 @@
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
diff --git a/arch/m68k/kernel/module.c b/arch/m68k/kernel/module.c
index 3b1a2ff..32969d0 100644
--- a/arch/m68k/kernel/module.c
+++ b/arch/m68k/kernel/module.c
@@ -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 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;
+ }
+ }
+}
diff --git a/arch/m68k/kernel/module.lds b/arch/m68k/kernel/module.lds
new file mode 100644
index 0000000..fda94fa
--- /dev/null
+++ b/arch/m68k/kernel/module.lds
@@ -0,0 +1,7 @@
+SECTIONS {
+ .m68k_fixup : {
+ __start_fixup = .;
+ *(.m68k_fixup)
+ __stop_fixup = .;
+ }
+}
diff --git a/arch/m68k/kernel/vmlinux-std.lds b/arch/m68k/kernel/vmlinux-std.lds
index 78f1392..40f02b1 100644
--- a/arch/m68k/kernel/vmlinux-std.lds
+++ b/arch/m68k/kernel/vmlinux-std.lds
@@ -60,6 +60,11 @@
__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);
diff --git a/arch/m68k/kernel/vmlinux-sun3.lds b/arch/m68k/kernel/vmlinux-sun3.lds
index c8999b2..f06425b 100644
--- a/arch/m68k/kernel/vmlinux-sun3.lds
+++ b/arch/m68k/kernel/vmlinux-sun3.lds
@@ -54,6 +54,11 @@
__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);