Thomas Moxon
Changes to support L152
Fork of
mbed-rtos
by 
mbed official
Diff: rtx/TARGET_M0/TOOLCHAIN_GCC/HAL_CM0.s
- Revision:
- 13:869ef732a8a2
- Parent:
- 6:350b53afb889
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/rtx/TARGET_M0/TOOLCHAIN_GCC/HAL_CM0.s Mon Aug 05 14:12:52 2013 +0300
@@ -0,0 +1,370 @@
+/*----------------------------------------------------------------------------
+ * RL-ARM - RTX
+ *----------------------------------------------------------------------------
+ * Name: HAL_CM0.S
+ * Purpose: Hardware Abstraction Layer for Cortex-M0
+ * Rev.: V4.60
+ *----------------------------------------------------------------------------
+ *
+ * Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
+ * All rights reserved.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * - Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *---------------------------------------------------------------------------*/
+
+ .file "HAL_CM0.S"
+ .syntax unified
+
+ .equ TCB_TSTACK, 36
+
+
+/*----------------------------------------------------------------------------
+ * Functions
+ *---------------------------------------------------------------------------*/
+
+ .thumb
+
+ .section ".text"
+ .align 2
+
+
+/*--------------------------- rt_set_PSP ------------------------------------*/
+
+# void rt_set_PSP (U32 stack);
+
+ .thumb_func
+ .type rt_set_PSP, %function
+ .global rt_set_PSP
+rt_set_PSP:
+ .fnstart
+ .cantunwind
+
+ MSR PSP,R0
+ BX LR
+
+ .fnend
+ .size rt_set_PSP, .-rt_set_PSP
+
+
+/*--------------------------- rt_get_PSP ------------------------------------*/
+
+# U32 rt_get_PSP (void);
+
+ .thumb_func
+ .type rt_get_PSP, %function
+ .global rt_get_PSP
+rt_get_PSP:
+ .fnstart
+ .cantunwind
+
+ MRS R0,PSP
+ BX LR
+
+ .fnend
+ .size rt_get_PSP, .-rt_get_PSP
+
+
+/*--------------------------- os_set_env ------------------------------------*/
+
+# void os_set_env (void);
+ /* Switch to Unprivileged/Privileged Thread mode, use PSP. */
+
+ .thumb_func
+ .type os_set_env, %function
+ .global os_set_env
+os_set_env:
+ .fnstart
+ .cantunwind
+
+ MOV R0,SP /* PSP = MSP */
+ MSR PSP,R0
+ LDR R0,=os_flags
+ LDRB R0,[R0]
+ LSLS R0,#31
+ BNE PrivilegedE
+ MOVS R0,#0x03 /* Unprivileged Thread mode, use PSP */
+ MSR CONTROL,R0
+ BX LR
+PrivilegedE:
+ MOVS R0,#0x02 /* Privileged Thread mode, use PSP */
+ MSR CONTROL,R0
+ BX LR
+
+ .fnend
+ .size os_set_env, .-os_set_env
+
+
+/*--------------------------- _alloc_box ------------------------------------*/
+
+# void *_alloc_box (void *box_mem);
+ /* Function wrapper for Unprivileged/Privileged mode. */
+
+ .thumb_func
+ .type _alloc_box, %function
+ .global _alloc_box
+_alloc_box:
+ .fnstart
+ .cantunwind
+
+ LDR R3,=rt_alloc_box
+ MOV R12,R3
+ MRS R3,IPSR
+ LSLS R3,#24
+ BNE PrivilegedA
+ MRS R3,CONTROL
+ LSLS R3,#31
+ BEQ PrivilegedA
+ SVC 0
+ BX LR
+PrivilegedA:
+ BX R12
+
+ .fnend
+ .size _alloc_box, .-_alloc_box
+
+
+/*--------------------------- _free_box -------------------------------------*/
+
+# int _free_box (void *box_mem, void *box);
+ /* Function wrapper for Unprivileged/Privileged mode. */
+
+ .thumb_func
+ .type _free_box, %function
+ .global _free_box
+_free_box:
+ .fnstart
+ .cantunwind
+
+ LDR R3,=rt_free_box
+ MOV R12,R3
+ MRS R3,IPSR
+ LSLS R3,#24
+ BNE PrivilegedF
+ MRS R3,CONTROL
+ LSLS R3,#31
+ BEQ PrivilegedF
+ SVC 0
+ BX LR
+PrivilegedF:
+ BX R12
+
+ .fnend
+ .size _free_box, .-_free_box
+
+
+/*-------------------------- SVC_Handler ------------------------------------*/
+
+# void SVC_Handler (void);
+
+ .thumb_func
+ .type SVC_Handler, %function
+ .global SVC_Handler
+SVC_Handler:
+ .fnstart
+ .cantunwind
+
+ MRS R0,PSP /* Read PSP */
+ LDR R1,[R0,#24] /* Read Saved PC from Stack */
+ SUBS R1,R1,#2 /* Point to SVC Instruction */
+ LDRB R1,[R1] /* Load SVC Number */
+ CMP R1,#0
+ BNE SVC_User /* User SVC Number > 0 */
+
+ MOV LR,R4
+ LDMIA R0,{R0-R3,R4} /* Read R0-R3,R12 from stack */
+ MOV R12,R4
+ MOV R4,LR
+ BLX R12 /* Call SVC Function */
+
+ MRS R3,PSP /* Read PSP */
+ STMIA R3!,{R0-R2} /* Store return values */
+
+ LDR R3,=os_tsk
+ LDMIA R3!,{R1,R2} /* os_tsk.run, os_tsk.new */
+ CMP R1,R2
+ BEQ SVC_Exit /* no task switch */
+
+ SUBS R3,#8
+ CMP R1,#0 /* Runtask deleted? */
+ BEQ SVC_Next
+
+ MRS R0,PSP /* Read PSP */
+ SUBS R0,R0,#32 /* Adjust Start Address */
+ STR R0,[R1,#TCB_TSTACK] /* Update os_tsk.run->tsk_stack */
+ STMIA R0!,{R4-R7} /* Save old context (R4-R7) */
+ MOV R4,R8
+ MOV R5,R9
+ MOV R6,R10
+ MOV R7,R11
+ STMIA R0!,{R4-R7} /* Save old context (R8-R11) */
+
+ PUSH {R2,R3}
+ BL rt_stk_check /* Check for Stack overflow */
+ POP {R2,R3}
+
+SVC_Next:
+ STR R2,[R3] /* os_tsk.run = os_tsk.new */
+
+ LDR R0,[R2,#TCB_TSTACK] /* os_tsk.new->tsk_stack */
+ ADDS R0,R0,#16 /* Adjust Start Address */
+ LDMIA R0!,{R4-R7} /* Restore new Context (R8-R11) */
+ MOV R8,R4
+ MOV R9,R5
+ MOV R10,R6
+ MOV R11,R7
+ MSR PSP,R0 /* Write PSP */
+ SUBS R0,R0,#32 /* Adjust Start Address */
+ LDMIA R0!,{R4-R7} /* Restore new Context (R4-R7) */
+
+SVC_Exit:
+ MOVS R0,#~0xFFFFFFFD /* Set EXC_RETURN value */
+ MVNS R0,R0
+ BX R0 /* RETI to Thread Mode, use PSP */
+
+ /*------------------- User SVC ------------------------------*/
+
+SVC_User:
+ PUSH {R4,LR} /* Save Registers */
+ LDR R2,=SVC_Count
+ LDR R2,[R2]
+ CMP R1,R2
+ BHI SVC_Done /* Overflow */
+
+ LDR R4,=SVC_Table-4
+ LSLS R1,R1,#2
+ LDR R4,[R4,R1] /* Load SVC Function Address */
+ MOV LR,R4
+
+ LDMIA R0,{R0-R3,R4} /* Read R0-R3,R12 from stack */
+ MOV R12,R4
+ BLX LR /* Call SVC Function */
+
+ MRS R4,PSP /* Read PSP */
+ STMIA R4!,{R0-R3} /* Function return values */
+SVC_Done:
+ POP {R4,PC} /* RETI */
+
+ .fnend
+ .size SVC_Handler, .-SVC_Handler
+
+
+/*-------------------------- PendSV_Handler ---------------------------------*/
+
+# void PendSV_Handler (void);
+
+ .thumb_func
+ .type PendSV_Handler, %function
+ .global PendSV_Handler
+ .global Sys_Switch
+PendSV_Handler:
+ .fnstart
+ .cantunwind
+
+ BL rt_pop_req
+
+Sys_Switch:
+ LDR R3,=os_tsk
+ LDMIA R3!,{R1,R2} /* os_tsk.run, os_tsk.new */
+ CMP R1,R2
+ BEQ Sys_Exit /* no task switch */
+
+ SUBS R3,#8
+
+ MRS R0,PSP /* Read PSP */
+ SUBS R0,R0,#32 /* Adjust Start Address */
+ STR R0,[R1,#TCB_TSTACK] /* Update os_tsk.run->tsk_stack */
+ STMIA R0!,{R4-R7} /* Save old context (R4-R7) */
+ MOV R4,R8
+ MOV R5,R9
+ MOV R6,R10
+ MOV R7,R11
+ STMIA R0!,{R4-R7} /* Save old context (R8-R11) */
+
+ PUSH {R2,R3}
+ BL rt_stk_check /* Check for Stack overflow */
+ POP {R2,R3}
+
+ STR R2,[R3] /* os_tsk.run = os_tsk.new */
+
+ LDR R0,[R2,#TCB_TSTACK] /* os_tsk.new->tsk_stack */
+ ADDS R0,R0,#16 /* Adjust Start Address */
+ LDMIA R0!,{R4-R7} /* Restore new Context (R8-R11) */
+ MOV R8,R4
+ MOV R9,R5
+ MOV R10,R6
+ MOV R11,R7
+ MSR PSP,R0 /* Write PSP */
+ SUBS R0,R0,#32 /* Adjust Start Address */
+ LDMIA R0!,{R4-R7} /* Restore new Context (R4-R7) */
+
+Sys_Exit:
+ MOVS R0,#~0xFFFFFFFD /* Set EXC_RETURN value */
+ MVNS R0,R0
+ BX R0 /* RETI to Thread Mode, use PSP */
+
+ .fnend
+ .size PendSV_Handler, .-PendSV_Handler
+
+
+/*-------------------------- SysTick_Handler --------------------------------*/
+
+# void SysTick_Handler (void);
+
+ .thumb_func
+ .type SysTick_Handler, %function
+ .global SysTick_Handler
+SysTick_Handler:
+ .fnstart
+ .cantunwind
+
+ BL rt_systick
+ B Sys_Switch
+
+ .fnend
+ .size SysTick_Handler, .-SysTick_Handler
+
+
+/*-------------------------- OS_Tick_Handler --------------------------------*/
+
+# void OS_Tick_Handler (void);
+
+ .thumb_func
+ .type OS_Tick_Handler, %function
+ .global OS_Tick_Handler
+OS_Tick_Handler:
+ .fnstart
+ .cantunwind
+
+ BL os_tick_irqack
+ BL rt_systick
+ B Sys_Switch
+
+ .fnend
+ .size OS_Tick_Handler, .-OS_Tick_Handler
+
+
+ .end
+
+/*----------------------------------------------------------------------------
+ * end of file
+ *---------------------------------------------------------------------------*/