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startup_ARMCM0plus.S
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1 /* File: startup_ARMCM0plus.S
2  * Purpose: startup file for Cortex-M0+ devices. Should use with
3  * GCC for ARM Embedded Processors
4  * Version: V1.0
5  * Date: 19 Mar 2012
6  *
7  * Copyright (c) 2012, ARM Limited
8  * All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions are met:
12  * Redistributions of source code must retain the above copyright
13  notice, this list of conditions and the following disclaimer.
14  * Redistributions in binary form must reproduce the above copyright
15  notice, this list of conditions and the following disclaimer in the
16  documentation and/or other materials provided with the distribution.
17  * Neither the name of the ARM Limited nor the
18  names of its contributors may be used to endorse or promote products
19  derived from this software without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24  * DISCLAIMED. IN NO EVENT SHALL ARM LIMITED BE LIABLE FOR ANY
25  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
26  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
28  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31  */
32  .syntax unified
33  .arch armv6-m
34 
35  .section .stack
36  .align 3
37 #ifdef __STACK_SIZE
38  .equ Stack_Size, __STACK_SIZE
39 #else
40  .equ Stack_Size, 0x400
41 #endif
42  .globl __StackTop
43  .globl __StackLimit
44 __StackLimit:
45  .space Stack_Size
46  .size __StackLimit, . - __StackLimit
47 __StackTop:
48  .size __StackTop, . - __StackTop
49 
50  .section .heap
51  .align 3
52 #ifdef __HEAP_SIZE
53  .equ Heap_Size, __HEAP_SIZE
54 #else
55  .equ Heap_Size, 0xC00
56 #endif
57  .globl __HeapBase
58  .globl __HeapLimit
59 __HeapBase:
60  .if Heap_Size
61  .space Heap_Size
62  .endif
63  .size __HeapBase, . - __HeapBase
64 __HeapLimit:
65  .size __HeapLimit, . - __HeapLimit
66 
67  .section .isr_vector
68  .align 2
69  .globl __isr_vector
70 __isr_vector:
71  .long __StackTop /* Top of Stack */
72  .long Reset_Handler /* Reset Handler */
73  .long NMI_Handler /* NMI Handler */
74  .long HardFault_Handler /* Hard Fault Handler */
75  .long 0 /* Reserved */
76  .long 0 /* Reserved */
77  .long 0 /* Reserved */
78  .long 0 /* Reserved */
79  .long 0 /* Reserved */
80  .long 0 /* Reserved */
81  .long 0 /* Reserved */
82  .long SVC_Handler /* SVCall Handler */
83  .long 0 /* Reserved */
84  .long 0 /* Reserved */
85  .long PendSV_Handler /* PendSV Handler */
86  .long SysTick_Handler /* SysTick Handler */
87 
88  /* External interrupts */
89  .long WDT_IRQHandler /* 0: Watchdog Timer */
90  .long RTC_IRQHandler /* 1: Real Time Clock */
91  .long TIM0_IRQHandler /* 2: Timer0 / Timer1 */
92  .long TIM2_IRQHandler /* 3: Timer2 / Timer3 */
93  .long MCIA_IRQHandler /* 4: MCIa */
94  .long MCIB_IRQHandler /* 5: MCIb */
95  .long UART0_IRQHandler /* 6: UART0 - DUT FPGA */
96  .long UART1_IRQHandler /* 7: UART1 - DUT FPGA */
97  .long UART2_IRQHandler /* 8: UART2 - DUT FPGA */
98  .long UART4_IRQHandler /* 9: UART4 - not connected */
99  .long AACI_IRQHandler /* 10: AACI / AC97 */
100  .long CLCD_IRQHandler /* 11: CLCD Combined Interrupt */
101  .long ENET_IRQHandler /* 12: Ethernet */
102  .long USBDC_IRQHandler /* 13: USB Device */
103  .long USBHC_IRQHandler /* 14: USB Host Controller */
104  .long CHLCD_IRQHandler /* 15: Character LCD */
105  .long FLEXRAY_IRQHandler /* 16: Flexray */
106  .long CAN_IRQHandler /* 17: CAN */
107  .long LIN_IRQHandler /* 18: LIN */
108  .long I2C_IRQHandler /* 19: I2C ADC/DAC */
109  .long 0 /* 20: Reserved */
110  .long 0 /* 21: Reserved */
111  .long 0 /* 22: Reserved */
112  .long 0 /* 23: Reserved */
113  .long 0 /* 24: Reserved */
114  .long 0 /* 25: Reserved */
115  .long 0 /* 26: Reserved */
116  .long 0 /* 27: Reserved */
117  .long CPU_CLCD_IRQHandler /* 28: Reserved - CPU FPGA CLCD */
118  .long 0 /* 29: Reserved - CPU FPGA */
119  .long UART3_IRQHandler /* 30: UART3 - CPU FPGA */
120  .long SPI_IRQHandler /* 31: SPI Touchscreen - CPU FPGA */
121 
122  .size __isr_vector, . - __isr_vector
123 
124  .text
125  .thumb
126  .thumb_func
127  .align 2
128  .globl Reset_Handler
129  .type Reset_Handler, %function
130 Reset_Handler:
131 /* Loop to copy data from read only memory to RAM. The ranges
132  * of copy from/to are specified by following symbols evaluated in
133  * linker script.
134  * __etext: End of code section, i.e., begin of data sections to copy from.
135  * __data_start__/__data_end__: RAM address range that data should be
136  * copied to. Both must be aligned to 4 bytes boundary. */
137 
138  ldr r1, =__etext
139  ldr r2, =__data_start__
140  ldr r3, =__data_end__
141 
142  subs r3, r2
143  ble .flash_to_ram_loop_end
144 
145  movs r4, 0
146 .flash_to_ram_loop:
147  ldr r0, [r1,r4]
148  str r0, [r2,r4]
149  adds r4, 4
150  cmp r4, r3
151  blt .flash_to_ram_loop
152 .flash_to_ram_loop_end:
153 
154 #ifndef __NO_SYSTEM_INIT
155  ldr r0, =SystemInit
156  blx r0
157 #endif
158 
159  ldr r0, =_start
160  bx r0
161  .pool
162  .size Reset_Handler, . - Reset_Handler
163 
164 /* Macro to define default handlers. Default handler
165  * will be weak symbol and just dead loops. They can be
166  * overwritten by other handlers */
167  .macro def_irq_handler handler_name
168  .align 1
169  .thumb_func
170  .weak \handler_name
171  .type \handler_name, %function
172 \handler_name :
173  b .
174  .size \handler_name, . - \handler_name
175  .endm
176 
177  def_irq_handler NMI_Handler
178  def_irq_handler HardFault_Handler
179  def_irq_handler SVC_Handler
180  def_irq_handler PendSV_Handler
181  def_irq_handler SysTick_Handler
182  def_irq_handler Default_Handler
183 
184  def_irq_handler WDT_IRQHandler
185  def_irq_handler RTC_IRQHandler
186  def_irq_handler TIM0_IRQHandler
187  def_irq_handler TIM2_IRQHandler
188  def_irq_handler MCIA_IRQHandler
189  def_irq_handler MCIB_IRQHandler
190  def_irq_handler UART0_IRQHandler
191  def_irq_handler UART1_IRQHandler
192  def_irq_handler UART2_IRQHandler
193  def_irq_handler UART3_IRQHandler
194  def_irq_handler UART4_IRQHandler
195  def_irq_handler AACI_IRQHandler
196  def_irq_handler CLCD_IRQHandler
197  def_irq_handler ENET_IRQHandler
198  def_irq_handler USBDC_IRQHandler
199  def_irq_handler USBHC_IRQHandler
200  def_irq_handler CHLCD_IRQHandler
201  def_irq_handler FLEXRAY_IRQHandler
202  def_irq_handler CAN_IRQHandler
203  def_irq_handler LIN_IRQHandler
204  def_irq_handler I2C_IRQHandler
205  def_irq_handler CPU_CLCD_IRQHandler
206  def_irq_handler SPI_IRQHandler
207 
208  .end