Fix some spell error;

libcpu/arm/cortex-m0/context_gcc.S

@@ -79,8 +79,8 @@ _reswitch:
     STR     R1, [R0]
     BX      LR
 
-/* R0 --> swith from thread stack
- * R1 --> swith to thread stack
+/* R0 --> switch from thread stack
+ * R1 --> switch to thread stack
  * psr, pc, LR, R12, R3, R2, R1, R0 are pushed into [from] stack
  */
     .global PendSV_Handler
@@ -103,7 +103,7 @@ PendSV_Handler:
     LDR     R0, =rt_interrupt_from_thread
     LDR     R1, [R0]
     CMP     R1, #0x00
-    BEQ     swtich_to_thread    /* skip register save at the first time */
+    BEQ     switch_to_thread    /* skip register save at the first time */
 
 	MRS     R1, PSP                 /* get from thread stack pointer */
 
@@ -118,7 +118,7 @@ PendSV_Handler:
     MOV     R6, R10
     MOV     R7, R11
     STMIA   R1!, {R4 - R7}          /* push thread {R8 - R11} high register to thread stack */
-swtich_to_thread:
+switch_to_thread:
     LDR     R1, =rt_interrupt_to_thread
     LDR     R1, [R1]
     LDR     R1, [R1]                /* load thread stack pointer */

libcpu/arm/cortex-m0/context_iar.S

@@ -81,8 +81,8 @@ _reswitch
     STR     r1, [r0]
     BX      LR
 
-; r0 --> swith from thread stack
-; r1 --> swith to thread stack
+; r0 --> switch from thread stack
+; r1 --> switch to thread stack
 ; psr, pc, lr, r12, r3, r2, r1, r0 are pushed into [from] stack
     EXPORT PendSV_Handler
 PendSV_Handler:
@@ -104,7 +104,7 @@ PendSV_Handler:
     LDR     r0, =rt_interrupt_from_thread
     LDR     r1, [r0]
     CMP     r1, #0x00
-    BEQ     swtich_to_thread        ; skip register save at the first time
+    BEQ     switch_to_thread        ; skip register save at the first time
 
     MRS     r1, psp                 ; get from thread stack pointer
 
@@ -120,7 +120,7 @@ PendSV_Handler:
     MOV     r7, r11
     STMIA   r1!, {r4 - r7}          ; push thread {r8 - r11} high register to thread stack
 
-swtich_to_thread
+switch_to_thread
     LDR     r1, =rt_interrupt_to_thread
     LDR     r1, [r1]
     LDR     r1, [r1]                ; load thread stack pointer

libcpu/arm/cortex-m0/context_rvds.S

@@ -85,8 +85,8 @@ _reswitch
     BX      LR
     ENDP
 
-; r0 --> swith from thread stack
-; r1 --> swith to thread stack
+; r0 --> switch from thread stack
+; r1 --> switch to thread stack
 ; psr, pc, lr, r12, r3, r2, r1, r0 are pushed into [from] stack
 PendSV_Handler    PROC
     EXPORT PendSV_Handler
@@ -108,7 +108,7 @@ PendSV_Handler    PROC
     LDR     r0, =rt_interrupt_from_thread
     LDR     r1, [r0]
     CMP     r1, #0x00
-    BEQ     swtich_to_thread        ; skip register save at the first time
+    BEQ     switch_to_thread        ; skip register save at the first time
 
     MRS     r1, psp                 ; get from thread stack pointer
 
@@ -124,7 +124,7 @@ PendSV_Handler    PROC
     MOV     r7, r11
     STMIA   r1!, {r4 - r7}          ; push thread {r8 - r11} high register to thread stack
 
-swtich_to_thread
+switch_to_thread
     LDR     r1, =rt_interrupt_to_thread
     LDR     r1, [r1]
     LDR     r1, [r1]                ; load thread stack pointer

libcpu/arm/cortex-m3/context_gcc.S

@@ -80,8 +80,8 @@ _reswitch:
     STR     R1, [R0]
     BX      LR
 
-/* R0 --> swith from thread stack
- * R1 --> swith to thread stack
+/* R0 --> switch from thread stack
+ * R1 --> switch to thread stack
  * psr, pc, LR, R12, R3, R2, R1, R0 are pushed into [from] stack
  */
     .global PendSV_Handler
@@ -102,14 +102,14 @@ PendSV_Handler:
 
     LDR     R0, =rt_interrupt_from_thread
     LDR     R1, [R0]
-    CBZ     R1, swtich_to_thread    /* skip register save at the first time */
+    CBZ     R1, switch_to_thread    /* skip register save at the first time */
 
     MRS     R1, PSP                 /* get from thread stack pointer */
     STMFD   R1!, {R4 - R11}         /* push R4 - R11 register */
     LDR     R0, [R0]
     STR     R1, [R0]                /* update from thread stack pointer */
 
-swtich_to_thread:
+switch_to_thread:
     LDR     R1, =rt_interrupt_to_thread
     LDR     R1, [R1]
     LDR     R1, [R1]                /* load thread stack pointer */

libcpu/arm/cortex-m3/context_iar.S

@@ -81,8 +81,8 @@ _reswitch
     STR     r1, [r0]
     BX      LR
 
-; r0 --> swith from thread stack
-; r1 --> swith to thread stack
+; r0 --> switch from thread stack
+; r1 --> switch to thread stack
 ; psr, pc, lr, r12, r3, r2, r1, r0 are pushed into [from] stack
     EXPORT PendSV_Handler
 PendSV_Handler:
@@ -102,14 +102,14 @@ PendSV_Handler:
 
     LDR     r0, =rt_interrupt_from_thread
     LDR     r1, [r0]
-    CBZ     r1, swtich_to_thread    ; skip register save at the first time
+    CBZ     r1, switch_to_thread    ; skip register save at the first time
 
     MRS     r1, psp                 ; get from thread stack pointer
     STMFD   r1!, {r4 - r11}         ; push r4 - r11 register
     LDR     r0, [r0]
     STR     r1, [r0]                ; update from thread stack pointer
 
-swtich_to_thread
+switch_to_thread
     LDR     r1, =rt_interrupt_to_thread
     LDR     r1, [r1]
     LDR     r1, [r1]                ; load thread stack pointer

libcpu/arm/cortex-m3/context_rvds.S

@@ -84,8 +84,8 @@ _reswitch
     BX      LR
     ENDP
 
-; r0 --> swith from thread stack
-; r1 --> swith to thread stack
+; r0 --> switch from thread stack
+; r1 --> switch to thread stack
 ; psr, pc, lr, r12, r3, r2, r1, r0 are pushed into [from] stack
 PendSV_Handler   PROC
     EXPORT PendSV_Handler
@@ -105,14 +105,14 @@ PendSV_Handler   PROC
 
     LDR     r0, =rt_interrupt_from_thread
     LDR     r1, [r0]
-    CBZ     r1, swtich_to_thread    ; skip register save at the first time
+    CBZ     r1, switch_to_thread    ; skip register save at the first time
 
     MRS     r1, psp                 ; get from thread stack pointer
     STMFD   r1!, {r4 - r11}         ; push r4 - r11 register
     LDR     r0, [r0]
     STR     r1, [r0]                ; update from thread stack pointer
 
-swtich_to_thread
+switch_to_thread
     LDR     r1, =rt_interrupt_to_thread
     LDR     r1, [r1]
     LDR     r1, [r1]                ; load thread stack pointer

libcpu/arm/cortex-m4/context_gcc.S

@@ -82,8 +82,8 @@ _reswitch:
     STR r1, [r0]
     BX  LR
 
-/* r0 --> swith from thread stack
- * r1 --> swith to thread stack
+/* r0 --> switch from thread stack
+ * r1 --> switch to thread stack
  * psr, pc, lr, r12, r3, r2, r1, r0 are pushed into [from] stack
  */
 .global PendSV_Handler
@@ -104,7 +104,7 @@ PendSV_Handler:
 
     LDR r0, =rt_interrupt_from_thread
     LDR r1, [r0]
-    CBZ r1, swtich_to_thread    /* skip register save at the first time */
+    CBZ r1, switch_to_thread    /* skip register save at the first time */
 
     MRS r1, psp                 /* get from thread stack pointer */
     
@@ -127,7 +127,7 @@ PendSV_Handler:
     LDR r0, [r0]
     STR r1, [r0]                /* update from thread stack pointer */
 
-swtich_to_thread:
+switch_to_thread:
     LDR r1, =rt_interrupt_to_thread
     LDR r1, [r1]
     LDR r1, [r1]                /* load thread stack pointer */

libcpu/arm/cortex-m4/context_iar.S

@@ -82,8 +82,8 @@ _reswitch
     STR     r1, [r0]
     BX      LR
 
-; r0 --> swith from thread stack
-; r1 --> swith to thread stack
+; r0 --> switch from thread stack
+; r1 --> switch to thread stack
 ; psr, pc, lr, r12, r3, r2, r1, r0 are pushed into [from] stack
     EXPORT PendSV_Handler
 PendSV_Handler:
@@ -103,7 +103,7 @@ PendSV_Handler:
 
     LDR     r0, =rt_interrupt_from_thread
     LDR     r1, [r0]
-    CBZ     r1, swtich_to_thread    ; skip register save at the first time
+    CBZ     r1, switch_to_thread    ; skip register save at the first time
 
     MRS     r1, psp                 ; get from thread stack pointer
 
@@ -130,7 +130,7 @@ push_flag
     LDR     r0, [r0]
     STR     r1, [r0]                ; update from thread stack pointer
 
-swtich_to_thread
+switch_to_thread
     LDR     r1, =rt_interrupt_to_thread
     LDR     r1, [r1]
     LDR     r1, [r1]                ; load thread stack pointer

libcpu/arm/cortex-m4/context_rvds.S

@@ -85,8 +85,8 @@ _reswitch
     BX      LR
     ENDP
 
-; r0 --> swith from thread stack
-; r1 --> swith to thread stack
+; r0 --> switch from thread stack
+; r1 --> switch to thread stack
 ; psr, pc, lr, r12, r3, r2, r1, r0 are pushed into [from] stack
 PendSV_Handler   PROC
     EXPORT PendSV_Handler
@@ -106,7 +106,7 @@ PendSV_Handler   PROC
 
     LDR     r0, =rt_interrupt_from_thread
     LDR     r1, [r0]
-    CBZ     r1, swtich_to_thread    ; skip register save at the first time
+    CBZ     r1, switch_to_thread    ; skip register save at the first time
 
     MRS     r1, psp                 ; get from thread stack pointer
 
@@ -129,7 +129,7 @@ PendSV_Handler   PROC
     LDR     r0, [r0]
     STR     r1, [r0]                ; update from thread stack pointer
 
-swtich_to_thread
+switch_to_thread
     LDR     r1, =rt_interrupt_to_thread
     LDR     r1, [r1]
     LDR     r1, [r1]                ; load thread stack pointer