struct task_struct;
+/**
+ * regs_get_kernel_argument() - get Nth function argument in kernel
+ * @regs: pt_regs of that context
+ * @n: function argument number (start from 0)
+ *
+ * regs_get_argument() returns @n th argument of the function call.
+ * Note that this chooses most probably assignment, in some case
+ * it can be incorrect.
+ * This is expected to be called from kprobes or ftrace with regs
+ * where the top of stack is the return address.
+ */
+static inline unsigned long regs_get_kernel_argument(struct pt_regs *regs,
+ unsigned int n)
+{
+#define NR_REG_ARGUMENTS 8
+ static const unsigned int args[] = {
+ offsetof(struct pt_regs, regs[4]),
+ offsetof(struct pt_regs, regs[5]),
+ offsetof(struct pt_regs, regs[6]),
+ offsetof(struct pt_regs, regs[7]),
+ offsetof(struct pt_regs, regs[8]),
+ offsetof(struct pt_regs, regs[9]),
+ offsetof(struct pt_regs, regs[10]),
+ offsetof(struct pt_regs, regs[11]),
+ };
+
+ if (n < NR_REG_ARGUMENTS)
+ return regs_get_register(regs, args[n]);
+ else {
+ n -= NR_REG_ARGUMENTS;
+ return regs_get_kernel_stack_nth(regs, n);
+ }
+}
+
/*
* Does the process account for user or for system time?
*/