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| author | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2011-03-06 10:32:00 +0000 |
|---|---|---|
| committer | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2011-03-06 10:32:00 +0000 |
| commit | 3964ec0195af626e59e6ce9dae1ed003576765ae (patch) | |
| tree | e301b402f7069bc6f281a2e4ea3d6e7493ea8d3b /os/ports/RVCT/ARMCMx | |
| parent | 30c73db82fbd034b89094dd58f069be43c1734d2 (diff) | |
| download | ChibiOS-3964ec0195af626e59e6ce9dae1ed003576765ae.tar.gz ChibiOS-3964ec0195af626e59e6ce9dae1ed003576765ae.tar.bz2 ChibiOS-3964ec0195af626e59e6ce9dae1ed003576765ae.zip | |
Cortex-M0 improvements for RVCT.
git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@2802 35acf78f-673a-0410-8e92-d51de3d6d3f4
Diffstat (limited to 'os/ports/RVCT/ARMCMx')
| -rw-r--r-- | os/ports/RVCT/ARMCMx/chcore_v6m.c | 5 | ||||
| -rw-r--r-- | os/ports/RVCT/ARMCMx/chcore_v6m.h | 22 | ||||
| -rw-r--r-- | os/ports/RVCT/ARMCMx/chcoreasm_v6m.s | 46 |
3 files changed, 27 insertions, 46 deletions
diff --git a/os/ports/RVCT/ARMCMx/chcore_v6m.c b/os/ports/RVCT/ARMCMx/chcore_v6m.c index db0cf7bf5..94b348140 100644 --- a/os/ports/RVCT/ARMCMx/chcore_v6m.c +++ b/os/ports/RVCT/ARMCMx/chcore_v6m.c @@ -28,11 +28,6 @@ #include "ch.h"
/**
- * @brief PC register temporary storage.
- */
-regarm_t _port_saved_pc;
-
-/**
* @brief System Timer vector.
* @details This interrupt is used as system tick.
* @note The timer must be initialized in the startup code.
diff --git a/os/ports/RVCT/ARMCMx/chcore_v6m.h b/os/ports/RVCT/ARMCMx/chcore_v6m.h index 59d5b6af0..df2646c22 100644 --- a/os/ports/RVCT/ARMCMx/chcore_v6m.h +++ b/os/ports/RVCT/ARMCMx/chcore_v6m.h @@ -32,10 +32,8 @@ /* Port implementation part. */
/*===========================================================================*/
-/**
- * @brief Cortex-Mx exception context.
- */
-struct cmxctx {
+#if !defined(__DOXYGEN__)
+struct extctx {
regarm_t r0;
regarm_t r1;
regarm_t r2;
@@ -46,18 +44,6 @@ struct cmxctx { regarm_t xpsr;
};
-#if !defined(__DOXYGEN__)
-struct extctx {
- regarm_t xpsr;
- regarm_t r12;
- regarm_t lr;
- regarm_t r0;
- regarm_t r1;
- regarm_t r2;
- regarm_t r3;
- regarm_t pc;
-};
-
struct intctx {
regarm_t r8;
regarm_t r9;
@@ -223,10 +209,6 @@ struct intctx { */
#define port_switch(ntp, otp) _port_switch(ntp, otp)
-#if !defined(__DOXYGEN__)
-extern regarm_t _port_saved_pc;
-#endif
-
#ifdef __cplusplus
extern "C" {
#endif
diff --git a/os/ports/RVCT/ARMCMx/chcoreasm_v6m.s b/os/ports/RVCT/ARMCMx/chcoreasm_v6m.s index a789e4a0e..44691cd99 100644 --- a/os/ports/RVCT/ARMCMx/chcoreasm_v6m.s +++ b/os/ports/RVCT/ARMCMx/chcoreasm_v6m.s @@ -27,6 +27,7 @@ EXTCTX_SIZE EQU 32
CONTEXT_OFFSET EQU 12
+SCB_ICSR EQU 0xE000ED04
PRESERVE8
THUMB
@@ -35,8 +36,6 @@ CONTEXT_OFFSET EQU 12 IMPORT chThdExit
IMPORT chSchIsRescRequiredExI
IMPORT chSchDoRescheduleI
- IMPORT _port_saved_pc
- IMPORT _port_irq_nesting
/*
* Performs a context switch between two threads.
@@ -74,28 +73,31 @@ _port_thread_start PROC ENDP
/*
+ * NMI vector.
+ * The NMI vector is used for exception mode re-entering after a context
+ * switch.
+ */
+ EXPORT NMIVector
+NMIVector PROC
+ mrs r3, PSP
+ adds r3, r3, #32
+ msr PSP, r3
+ cpsie i
+ bx lr
+ ENDP
+
+/*
* Post-IRQ switch code.
* Exception handlers return here for context switching.
*/
EXPORT _port_switch_from_isr
_port_switch_from_isr PROC
- /* Note, saves r4 to make space for the PC.*/
- push {r0, r1, r2, r3, r4}
- mrs r0, APSR
- mov r1, r12
- push {r0, r1, lr}
- ldr r0, =_port_saved_pc
- ldr r0, [r0]
- adds r0, r0, #1
- str r0, [sp, #28]
bl chSchDoRescheduleI
- pop {r0, r1, r2}
- mov r12, r1
- msr APSR, r0
- mov lr, r2
- pop {r0, r1, r2, r3}
- cpsie i
- pop {pc}
+ movs r3, #128
+ lsls r3, r3, #24
+ ldr r2, =SCB_ICSR
+ str r3, [r2, #0]
+_waitnmi b _waitnmi
ENDP
/*
@@ -115,11 +117,13 @@ stillnested pop {r3, pc}
doresch
mrs r3, PSP
- ldr r2, =_port_saved_pc
- ldr r1, [r3, #24]
- str r1, [r2]
+ subs r3, r3, #32
+ msr PSP, r3
ldr r2, =_port_switch_from_isr
str r2, [r3, #24]
+ movs r2, #128
+ lsls r2, r2, #17
+ str r2, [r3, #28]
pop {r3, pc}
ENDP
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