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livepatch: move x86 specific ftrace handler code to arch/x86 

The execution flow redirection related implemention in the livepatch
ftrace handler is depended on the specific architecture. This patch
introduces klp_arch_set_pc(like kgdb_arch_set_pc) interface to change
the pt_regs.

Signed-off-by: Li Bin <huawei.libin@huawei.com>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Li Bin 2014-12-19 14:11:17 +08:00 committed by Jiri Kosina
parent 13d1cf7e70
commit b5bfc51707
2 changed files with 6 additions and 1 deletions
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5
arch/x86/include/asm/livepatch.h
View File

@ -22,6 +22,7 @@
#define _ASM_X86_LIVEPATCH_H
#include <linux/module.h>
#include <linux/ftrace.h>
#ifdef CONFIG_LIVE_PATCHING
#ifndef CC_USING_FENTRY
@ -30,6 +31,10 @@
extern int klp_write_module_reloc(struct module *mod, unsigned long type,
unsigned long loc, unsigned long value);
static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip)
{
regs->ip = ip;
}
#else
#error Live patching support is disabled; check CONFIG_LIVE_PATCHING
#endif

2
kernel/livepatch/core.c
View File

@ -272,7 +272,7 @@ static void notrace klp_ftrace_handler(unsigned long ip,
{
struct klp_func *func = ops->private;
regs->ip = (unsigned long)func->new_func;
klp_arch_set_pc(regs, (unsigned long)func->new_func);
}
static int klp_disable_func(struct klp_func *func)