ARMv7-M: start using "struct arm"

This sets up a few of the core "struct arm" data structures so they
can be used with ARMv7-M cores.  Specifically, it:

 - defines new ARM core_modes to match the microcontroller modes
   (e.g. HANDLER not IRQ, and two types of thread mode);

 - Establishes a new microcontroller "core_type", which can be
   used to make sure v7-M (and v6-M) cores are handled right;

 - adds "struct arm" to "struct armv7m" and arranges for the
   target_to_armv7m() converter to use it;

 - sets up the arm.core_cache and arm.cpsr values

 - makes the Cortex-M3 code maintain arm.map and arm.core_mode.

This is currently set up as a parallel data structure, primarily to
minimize special cases for the semihosting support with microcontroller
profile cores.

Later patches can rip out the duplicative ARMv7-M support and start
reusing core ARM code.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/target/armv7m.h b/src/target/armv7m.h
index b6be1d22..89c5064c 100644
--- a/src/target/armv7m.h
+++ b/src/target/armv7m.h
@@ -100,6 +100,8 @@ enum
 
 struct armv7m_common
 {
+	struct arm	arm;
+
 	int common_magic;
 	struct reg_cache *core_cache;
 	enum armv7m_mode core_mode;
@@ -128,7 +130,7 @@ struct armv7m_common
 static inline struct armv7m_common *
 target_to_armv7m(struct target *target)
 {
-	return target->arch_info;
+	return container_of(target->arch_info, struct armv7m_common, arm);
 }
 
 static inline bool is_armv7m(struct armv7m_common *armv7m)