ARM: kprobes: enable OPTPROBES for ARM 32

This patch introduce kprobeopt for ARM 32.

Limitations:
 - Currently only kernel compiled with ARM ISA is supported.

 - Offset between probe point and optinsn slot must not larger than
   32MiB. Masami Hiramatsu suggests replacing 2 words, it will make
   things complex. Futher patch can make such optimization.

Kprobe opt on ARM is relatively simpler than kprobe opt on x86 because
ARM instruction is always 4 bytes aligned and 4 bytes long. This patch
replace probed instruction by a 'b', branch to trampoline code and then
calls optimized_callback(). optimized_callback() calls opt_pre_handler()
to execute kprobe handler. It also emulate/simulate replaced instruction.

When unregistering kprobe, the deferred manner of unoptimizer may leave
branch instruction before optimizer is called. Different from x86_64,
which only copy the probed insn after optprobe_template_end and
reexecute them, this patch call singlestep to emulate/simulate the insn
directly. Futher patch can optimize this behavior.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Will Deacon <will.deacon@arm.com>
Reviewed-by: Jon Medhurst (Tixy) <tixy@linaro.org>
Signed-off-by: Jon Medhurst <tixy@linaro.org>

1 files changed, 0 insertions, 29 deletions

diff --git a/arch/arm/kernel/insn.h b/arch/arm/kernel/insn.h
deleted file mode 100644
index e96065da4dae..000000000000
--- a/arch/arm/kernel/insn.h
+++ /dev/null
@@ -1,29 +0,0 @@
-#ifndef __ASM_ARM_INSN_H
-#define __ASM_ARM_INSN_H
-
-static inline unsigned long
-arm_gen_nop(void)
-{
-#ifdef CONFIG_THUMB2_KERNEL
-	return 0xf3af8000; /* nop.w */
-#else
-	return 0xe1a00000; /* mov r0, r0 */
-#endif
-}
-
-unsigned long
-__arm_gen_branch(unsigned long pc, unsigned long addr, bool link);
-
-static inline unsigned long
-arm_gen_branch(unsigned long pc, unsigned long addr)
-{
-	return __arm_gen_branch(pc, addr, false);
-}
-
-static inline unsigned long
-arm_gen_branch_link(unsigned long pc, unsigned long addr)
-{
-	return __arm_gen_branch(pc, addr, true);
-}
-
-#endif