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arch/arm: add initial support for Cortex-M0/M0+

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Not disabling SysTick as it is optional by the spec.

SVC not used as there is no priority-based interrupt masking (only
PendSV is used).

Largely based on a previous work done by Euan Mutch <euan@abelon.com>.

Jira: ZEP-783

Change-Id: I38e29bfcf0624c1aea5f9fd7a74230faa1b59e8b
Signed-off-by: Ricardo Salveti <ricardo.salveti@linaro.org>
This commit is contained in:
Ricardo Salveti 2016-10-05 19:43:36 -03:00 • committed by Anas Nashif
commit ffacae20d0
18 changed files with 325 additions and 84 deletions
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27
arch/arm/core/exc_exit.S
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@ -16,7 +16,7 @@
/**
* @file
* @brief ARM CORTEX-M3 exception/interrupt exit API
* @brief ARM CORTEX-M exception/interrupt exit API
*
*
* Provides functions for performing kernel handling when exiting exceptions or
@ -44,10 +44,7 @@ GTEXT(_is_next_thread_current)
#if CONFIG_GDB_INFO
#define _EXIT_EXC_IF_FIBER_PREEMPTED beq _ExcExitWithGdbStub
#else
_EXIT_EXC_IF_FIBER_PREEMPTED: .macro
it eq
bxeq lr
.endm
#define _EXIT_EXC_IF_FIBER_PREEMPTED beq _EXIT_EXC
#endif
#define _EXIT_EXC_IF_FIBER_NOT_READY _EXIT_EXC_IF_FIBER_PREEMPTED
@ -104,26 +101,28 @@ SECTION_SUBSEC_FUNC(TEXT, _HandlerModeExit, _ExcExit)
/* coop thread ? do not schedule */
cmp r2, #0
it lt
bxlt lr
blt _EXIT_EXC
/* scheduler locked ? do not schedule */
cmp r3, #0
it gt
bxgt lr
bgt _EXIT_EXC
push {lr}
blx _is_next_thread_current
#if defined(CONFIG_CPU_CORTEX_M0_M0PLUS)
pop {r1}
mov lr, r1
#else
pop {lr}
#endif /* CONFIG_CPU_CORTEX_M0_M0PLUS */
cmp r0, #0
it ne
bxne lr
bne _EXIT_EXC
#else
/* is the current thread preemptible (task) ? */
ldr r2, [r1, #__tNANO_flags_OFFSET]
ands.w r2, #PREEMPTIBLE
ldr r3, =PREEMPTIBLE
ands r2, r3
_EXIT_EXC_IF_FIBER_PREEMPTED
/* is there a fiber ready ? */
@ -142,4 +141,6 @@ _ExcExitWithGdbStub:
_GDB_STUB_EXC_EXIT
_EXIT_EXC:
bx lr