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authorJon Medhurst <tixy@yxit.co.uk>2011-07-02 15:36:32 +0100
committerTixy <tixy@medhuaa1.miniserver.com>2011-07-13 17:32:43 +0000
commit3f92dfed6a9a5f490128c8e7cc6a64dfe412994f (patch)
tree1d503b19d01075dfd1db1023b8d0e787f9d58bb6 /arch/arm/kernel/kprobes.h
parent0d1a095aa1e6e2a233bfb1729e15233e77f69d54 (diff)
ARM: kprobes: Decode 16-bit Thumb hint instructions
For hints which may have observable effects, like SEV (send event), we use kprobe_emulate_none which emulates the hint by executing the original instruction. For NOP we simulate the instruction using kprobe_simulate_nop, which does nothing. As probes execute with interrupts disabled this is also used for hints which may block for an indefinite time, like WFE (wait for event). Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Diffstat (limited to 'arch/arm/kernel/kprobes.h')
-rw-r--r--arch/arm/kernel/kprobes.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/kernel/kprobes.h b/arch/arm/kernel/kprobes.h
index c00681ce5cce..36e07684fe08 100644
--- a/arch/arm/kernel/kprobes.h
+++ b/arch/arm/kernel/kprobes.h
@@ -95,6 +95,9 @@ static inline unsigned long it_advance(unsigned long cpsr)
return cpsr;
}
+void __kprobes kprobe_simulate_nop(struct kprobe *p, struct pt_regs *regs);
+void __kprobes kprobe_emulate_none(struct kprobe *p, struct pt_regs *regs);
+
/*
* Test if load/store instructions writeback the address register.
* if P (bit 24) == 0 or W (bit 21) == 1