ARM: kprobes: collects stack consumption for store instructions
This patch uses the previously introduced checker functionality on
store instructions to record their stack consumption information to
arch_probes_insn.
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Reviewed-by: Jon Medhurst <tixy@linaro.org>
Signed-off-by: Jon Medhurst <tixy@linaro.org>
diff --git a/arch/arm/probes/decode.c b/arch/arm/probes/decode.c
index c7d4420..f9d7c42 100644
--- a/arch/arm/probes/decode.c
+++ b/arch/arm/probes/decode.c
@@ -425,6 +425,16 @@
*/
probes_opcode_t origin_insn = insn;
+ /*
+ * stack_space is initialized to 0 here. Checker functions
+ * should update is value if they find this is a stack store
+ * instruction: positive value means bytes of stack usage,
+ * negitive value means unable to determine stack usage
+ * statically. For instruction doesn't store to stack, checker
+ * do nothing with it.
+ */
+ asi->stack_space = 0;
+
if (emulate)
insn = prepare_emulated_insn(insn, asi, thumb);