From 796969104cab0d454dbc792ad0d12a4f365a8564 Mon Sep 17 00:00:00 2001 From: Nicolas Pitre Date: Mon, 3 Dec 2007 17:22:36 -0500 Subject: ARM kprobes: special hook for the kprobes breakpoint handler The kprobes code is already able to cope with reentrant probes, so its handler must be called outside of the region protected by undef_lock. If ever this lock is released when handlers are called then this commit could be reverted. Signed-off-by: Nicolas Pitre --- include/asm-arm/kprobes.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'include/asm-arm') diff --git a/include/asm-arm/kprobes.h b/include/asm-arm/kprobes.h index 273f37413ee6..4e7bd32288ae 100644 --- a/include/asm-arm/kprobes.h +++ b/include/asm-arm/kprobes.h @@ -25,6 +25,12 @@ #define MAX_INSN_SIZE 2 #define MAX_STACK_SIZE 64 /* 32 would probably be OK */ +/* + * This undefined instruction must be unique and + * reserved solely for kprobes' use. + */ +#define KPROBE_BREAKPOINT_INSTRUCTION 0xe7f001f8 + #define regs_return_value(regs) ((regs)->ARM_r0) #define flush_insn_slot(p) do { } while (0) #define kretprobe_blacklist_size 0 @@ -55,6 +61,7 @@ struct kprobe_ctlblk { void arch_remove_kprobe(struct kprobe *); +int kprobe_trap_handler(struct pt_regs *regs, unsigned int instr); int kprobe_fault_handler(struct pt_regs *regs, unsigned int fsr); int kprobe_exceptions_notify(struct notifier_block *self, unsigned long val, void *data); -- cgit v1.2.3