| /* File: startup_ARMCM0.S |
| * Purpose: startup file for Cortex-M0 devices. Should use with |
| * GCC for ARM Embedded Processors |
| * Version: V1.2 |
| * Date: 15 Nov 2011 |
| * |
| * Copyright (c) 2011, ARM Limited |
| * 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 the ARM Limited 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 ARM LIMITED 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. |
| */ |
| .syntax unified |
| .arch armv6-m |
| |
| .section .stack |
| .align 3 |
| #ifdef __STACK_SIZE |
| .equ Stack_Size, __STACK_SIZE |
| #else |
| .equ Stack_Size, 0xc00 |
| #endif |
| .globl __StackTop |
| .globl __StackLimit |
| __StackLimit: |
| .space Stack_Size |
| .size __StackLimit, . - __StackLimit |
| __StackTop: |
| .size __StackTop, . - __StackTop |
| |
| .section .heap |
| .align 3 |
| #ifdef __HEAP_SIZE |
| .equ Heap_Size, __HEAP_SIZE |
| #else |
| .equ Heap_Size, 0x100 |
| #endif |
| .globl __HeapBase |
| .globl __HeapLimit |
| __HeapBase: |
| .space Heap_Size |
| .size __HeapBase, . - __HeapBase |
| __HeapLimit: |
| .size __HeapLimit, . - __HeapLimit |
| |
| .section .isr_vector |
| .align 2 |
| .globl __isr_vector |
| __isr_vector: |
| .long __StackTop /* Top of Stack */ |
| .long Reset_Handler /* Reset Handler */ |
| .long NMI_Handler /* NMI Handler */ |
| .long HardFault_Handler /* Hard Fault Handler */ |
| .long 0 /* Reserved */ |
| .long 0 /* Reserved */ |
| .long 0 /* Reserved */ |
| .long 0 /* Reserved */ |
| .long 0 /* Reserved */ |
| .long 0 /* Reserved */ |
| .long 0 /* Reserved */ |
| .long SVC_Handler /* SVCall Handler */ |
| .long 0 /* Reserved */ |
| .long 0 /* Reserved */ |
| .long PendSV_Handler /* PendSV Handler */ |
| .long SysTick_Handler /* SysTick Handler */ |
| |
| /* External interrupts */ |
| .long Default_Handler |
| |
| .size __isr_vector, . - __isr_vector |
| |
| .text |
| .thumb |
| .thumb_func |
| .align 2 |
| .globl Reset_Handler |
| .type Reset_Handler, %function |
| Reset_Handler: |
| /* Loop to copy data from read only memory to RAM. The ranges |
| * of copy from/to are specified by following symbols evaluated in |
| * linker script. |
| * __etext: End of code section, i.e., begin of data sections to copy from. |
| * __data_start__/__data_end__: RAM address range that data should be |
| * copied to. Both must be aligned to 4 bytes boundary. */ |
| |
| ldr r1, =__etext |
| ldr r2, =__data_start__ |
| ldr r3, =__data_end__ |
| |
| subs r3, r2 |
| ble .flash_to_ram_loop_end |
| |
| movs r4, 0 |
| .flash_to_ram_loop: |
| ldr r0, [r1,r4] |
| str r0, [r2,r4] |
| adds r4, 4 |
| cmp r4, r3 |
| blt .flash_to_ram_loop |
| .flash_to_ram_loop_end: |
| |
| ldr r0, =SystemInit |
| blx r0 |
| ldr r0, =_start |
| bx r0 |
| .pool |
| .size Reset_Handler, . - Reset_Handler |
| |
| /* Macro to define default handlers. Default handler |
| * will be weak symbol and just dead loops. They can be |
| * overwritten by other handlers */ |
| .macro def_default_handler handler_name |
| .align 1 |
| .thumb_func |
| .weak \handler_name |
| .type \handler_name, %function |
| \handler_name : |
| b . |
| .size \handler_name, . - \handler_name |
| .endm |
| |
| def_default_handler NMI_Handler |
| def_default_handler HardFault_Handler |
| def_default_handler SVC_Handler |
| def_default_handler PendSV_Handler |
| def_default_handler SysTick_Handler |
| def_default_handler Default_Handler |
| |
| .weak DEF_IRQHandler |
| .set DEF_IRQHandler, Default_Handler |
| |
| .end |
