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ARM: kprobes: Extend arch_specific_insn to add pointer to emulated instruction

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When we come to emulating Thumb instructions then, to interwork
correctly, the code on in the instruction slot must be invoked with a
function pointer which has the least significant bit set. Rather that
set this by hand in every Thumb emulation function we will add a new
field for this purpose to arch_specific_insn, called insn_fn.

This also enables us to seamlessly share emulation functions between ARM
and Thumb code.

Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
This commit is contained in:
Jon Medhurst
2011-06-09 14:05:51 +01:00
committed by Tixy
parent c6a7d97d57
commit e2960317d4
2 changed files with 7 additions and 0 deletions
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2
arch/arm/include/asm/kprobes.h
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@@ -34,6 +34,7 @@ struct kprobe;
typedef void (kprobe_insn_handler_t)(struct kprobe *, struct pt_regs *);
typedef unsigned long (kprobe_check_cc)(unsigned long);
typedef void (kprobe_insn_singlestep_t)(struct kprobe *, struct pt_regs *);
typedef void (kprobe_insn_fn_t)(void);
/* Architecture specific copy of original instruction. */
struct arch_specific_insn {
@@ -41,6 +42,7 @@ struct arch_specific_insn {
kprobe_insn_handler_t *insn_handler;
kprobe_check_cc *insn_check_cc;
kprobe_insn_singlestep_t *insn_singlestep;
kprobe_insn_fn_t *insn_fn;
};
struct prev_kprobe {