Move kstack_contains() and GET_STACK_USAGE() to MD machine/stack.h

Reviewed by:	jhb
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D38320

sys/arm/arm/ptrace_machdep.c

@@ -32,6 +32,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/proc.h>
 #include <sys/ptrace.h>
 #include <sys/reg.h>
+#include <machine/pcb.h>
 #ifdef VFP
 #include <machine/vfp.h>
 #endif

sys/arm/include/proc.h

@@ -56,15 +56,4 @@ struct mdproc {
 
 #define	KINFO_PROC_SIZE 816
 
-#ifdef _KERNEL
-#include <machine/pcb.h>
-
-/* Get the current kernel thread stack usage. */
-#define	GET_STACK_USAGE(total, used) do {				\
-	struct thread *td = curthread;					\
-	(total) = td->td_kstack_pages * PAGE_SIZE - sizeof(struct pcb);	\
-	(used) = td->td_kstack + (total) - (vm_offset_t)&td;		\
-} while (0)
-
-#endif  /* _KERNEL */
 #endif /* !_MACHINE_PROC_H_ */

sys/arm/include/stack.h

@@ -63,6 +63,25 @@ struct linker_file;
 void unwind_module_loaded(struct linker_file *);
 void unwind_module_unloaded(struct linker_file *);
 
+#ifdef _SYS_PROC_H_
+
+#include <machine/pcb.h>
+
+/* Get the current kernel thread stack usage. */
+#define	GET_STACK_USAGE(total, used) do {				\
+	struct thread *td = curthread;					\
+	(total) = td->td_kstack_pages * PAGE_SIZE - sizeof(struct pcb);	\
+	(used) = td->td_kstack + (total) - (vm_offset_t)&td;		\
+} while (0)
+
+static __inline bool
+kstack_contains(struct thread *td, vm_offset_t va, size_t len)
+{
+	return (va >= td->td_kstack && va + len >= va &&
+	    va + len <= td->td_kstack + td->td_kstack_pages * PAGE_SIZE);
+}
+#endif	/* _SYS_PROC_H_ */
+
 #endif
 
 #endif /* !_MACHINE_STACK_H_ */