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Subject: [PATCH] m68k: runtime patching infrastructure
From: Roman Zippel <zippel@linux-m68k.org>
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>
---
arch/m68k/Makefile | 1 +
arch/m68k/kernel/module.c | 24 +++++++++++++++++++++++-
arch/m68k/kernel/module.lds | 7 +++++++
arch/m68k/kernel/vmlinux-std.lds | 5 +++++
arch/m68k/kernel/vmlinux-sun3.lds | 5 +++++
arch/m68k/mm/motorola.c | 3 +++
include/asm-m68k/module.h | 33 ++++++++++++++++++++++++++++++++-
include/asm-m68k/page.h | 29 ++++++++++++++++++++++++++---
8 files changed, 102 insertions(+), 5 deletions(-)
--- linux-m68k-2.6.21.orig/arch/m68k/Makefile
+++ linux-m68k-2.6.21/arch/m68k/Makefile
@@ -19,6 +19,7 @@ COMPILE_ARCH = $(shell uname -m)
# override top level makefile
AS += -m68020
LDFLAGS := -m m68kelf
+LDFLAGS_MODULE += -T $(srctree)/arch/m68k/kernel/module.lds
ifneq ($(COMPILE_ARCH),$(ARCH))
# prefix for cross-compiling binaries
CROSS_COMPILE = m68k-linux-gnu-
--- linux-m68k-2.6.21.orig/arch/m68k/kernel/module.c
+++ linux-m68k-2.6.21/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>
@@ -116,10 +122,26 @@ int apply_relocate_add(Elf32_Shdr *sechd
return 0;
}
+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;
+ }
+ }
+}
+
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;
}
--- /dev/null
+++ linux-m68k-2.6.21/arch/m68k/kernel/module.lds
@@ -0,0 +1,7 @@
+SECTIONS {
+ .m68k_fixup : {
+ __start_fixup = .;
+ *(.m68k_fixup)
+ __stop_fixup = .;
+ }
+}
--- linux-m68k-2.6.21.orig/arch/m68k/kernel/vmlinux-std.lds
+++ linux-m68k-2.6.21/arch/m68k/kernel/vmlinux-std.lds
@@ -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);
--- linux-m68k-2.6.21.orig/arch/m68k/kernel/vmlinux-sun3.lds
+++ linux-m68k-2.6.21/arch/m68k/kernel/vmlinux-sun3.lds
@@ -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);
--- linux-m68k-2.6.21.orig/arch/m68k/mm/motorola.c
+++ linux-m68k-2.6.21/arch/m68k/mm/motorola.c
@@ -222,6 +222,9 @@ void __init paging_init(void)
pgprot_val(protection_map[i]) |= _PAGE_CACHE040;
}
+ module_fixup(NULL, __start_fixup, __stop_fixup);
+ flush_icache();
+
/*
* Map the physical memory available into the kernel virtual
* address space. It may allocate some memory for page
--- linux-m68k-2.6.21.orig/include/asm-m68k/module.h
+++ linux-m68k-2.6.21/include/asm-m68k/module.h
@@ -1,7 +1,38 @@
#ifndef _ASM_M68K_MODULE_H
#define _ASM_M68K_MODULE_H
-struct mod_arch_specific { };
+
+struct mod_arch_specific {
+ struct m68k_fixup_info *fixup_start, *fixup_end;
+};
+
+#define MODULE_ARCH_INIT { \
+ .fixup_start = __start_fixup, \
+ .fixup_end = __stop_fixup, \
+}
+
#define Elf_Shdr Elf32_Shdr
#define Elf_Sym Elf32_Sym
#define Elf_Ehdr Elf32_Ehdr
+
+
+enum m68k_fixup_type {
+ m68k_fixup_memoffset,
+};
+
+struct m68k_fixup_info {
+ enum m68k_fixup_type type;
+ void *addr;
+};
+
+#define m68k_fixup(type, addr) \
+ " .section \".m68k_fixup\",\"aw\"\n" \
+ " .long " #type "," #addr "\n" \
+ " .previous\n"
+
+extern struct m68k_fixup_info __start_fixup[], __stop_fixup[];
+
+struct module;
+extern void module_fixup(struct module *mod, struct m68k_fixup_info *start,
+ struct m68k_fixup_info *end);
+
#endif /* _ASM_M68K_MODULE_H */
--- linux-m68k-2.6.21.orig/include/asm-m68k/page.h
+++ linux-m68k-2.6.21/include/asm-m68k/page.h
@@ -27,6 +27,8 @@
#ifndef __ASSEMBLY__
+#include <asm/module.h>
+
#define get_user_page(vaddr) __get_free_page(GFP_KERNEL)
#define free_user_page(page, addr) free_page(addr)
@@ -114,14 +116,35 @@ typedef struct { unsigned long pgprot; }
#ifndef __ASSEMBLY__
+extern unsigned long m68k_memoffset;
+
#ifndef CONFIG_SUN3
#define WANT_PAGE_VIRTUAL
#ifdef CONFIG_SINGLE_MEMORY_CHUNK
-extern unsigned long m68k_memoffset;
-#define __pa(vaddr) ((unsigned long)(vaddr)+m68k_memoffset)
-#define __va(paddr) ((void *)((unsigned long)(paddr)-m68k_memoffset))
+static inline unsigned long ___pa(void *vaddr)
+{
+ unsigned long paddr;
+ asm (
+ "1: addl #0,%0\n"
+ m68k_fixup(%c2, 1b+2)
+ : "=r" (paddr)
+ : "0" (vaddr), "i" (m68k_fixup_memoffset));
+ return paddr;
+}
+#define __pa(vaddr) ___pa((void *)(vaddr))
+static inline void *__va(unsigned long paddr)
+{
+ void *vaddr;
+ asm (
+ "1: subl #0,%0\n"
+ m68k_fixup(%c2, 1b+2)
+ : "=r" (vaddr)
+ : "0" (paddr), "i" (m68k_fixup_memoffset));
+ return vaddr;
+}
+
#else
#define __pa(vaddr) virt_to_phys((void *)(vaddr))
#define __va(paddr) phys_to_virt((unsigned long)(paddr))
|
