From ce1feaa7322affd3b979c9fe93dd8f7462ea9eca Mon Sep 17 00:00:00 2001 From: David Brownell Date: Sun, 21 Feb 2010 14:28:53 -0800 Subject: 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 --- src/target/arm.h | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) (limited to 'src/target/arm.h') diff --git a/src/target/arm.h b/src/target/arm.h index 988266e3..c72b1942 100644 --- a/src/target/arm.h +++ b/src/target/arm.h @@ -40,9 +40,17 @@ */ /** - * These numbers match the five low bits of the *PSR registers on + * Represent state of an ARM core. + * + * Most numbers match the five low bits of the *PSR registers on * "classic ARM" processors, which build on the ARMv4 processor * modes and register set. + * + * ARM_MODE_ANY is a magic value, often used as a wildcard. + * + * Only the microcontroller cores (ARMv6-M, ARMv7-M) support ARM_MODE_THREAD, + * ARM_MODE_USER_THREAD, and ARM_MODE_HANDLER. Those are the only modes + * they support. */ enum arm_mode { ARM_MODE_USR = 16, @@ -53,6 +61,11 @@ enum arm_mode { ARM_MODE_MON = 26, ARM_MODE_UND = 27, ARM_MODE_SYS = 31, + + ARM_MODE_THREAD, + ARM_MODE_USER_THREAD, + ARM_MODE_HANDLER, + ARM_MODE_ANY = -1 }; @@ -96,6 +109,8 @@ struct arm { * ARM_MODE_ANY indicates the standard set of 37 registers, * seen on for example ARM7TDMI cores. ARM_MODE_MON indicates three * more registers are shadowed, for "Secure Monitor" mode. + * ARM_MODE_THREAD indicates a microcontroller profile core, + * which only shadows SP. */ enum arm_mode core_type; -- cgit v1.2.3