Startup.s
上传用户:gzxf2008
上传日期:2016-10-05
资源大小:181k
文件大小:5k
- ;********************************************************************************************************/
- ;define the stack size
- ;定义堆栈的大小
- SVC_STACK_LEGTH EQU 0
- FIQ_STACK_LEGTH EQU 0
- IRQ_STACK_LEGTH EQU 256
- ABT_STACK_LEGTH EQU 0
- UND_STACK_LEGTH EQU 0
- NoInt EQU 0x80
- USR32Mode EQU 0x10
- SVC32Mode EQU 0x13
- SYS32Mode EQU 0x1f
- IRQ32Mode EQU 0x12
- FIQ32Mode EQU 0x11
- IMPORT __use_no_semihosting_swi
- ;The imported labels
- ;引入的外部标号在这声明
- IMPORT FIQ_Exception ;Fast interrupt exceptions handler 快速中断异常处理程序
- IMPORT __main ;The entry point to the main function C语言主程序入口
- IMPORT TargetResetInit ;initialize the target board 目标板基本初始化
- ;The emported labels
- ;给外部使用的标号在这声明
- EXPORT bottom_of_heap
- EXPORT StackUsr
-
- EXPORT Reset
- EXPORT __user_initial_stackheap
- CODE32
- PRESERVE8
- AREA vectors,CODE,READONLY
- ENTRY
- ;interrupt vectors
- ;中断向量表
- Reset
- LDR PC, ResetAddr
- LDR PC, UndefinedAddr
- LDR PC, SWI_Addr
- LDR PC, PrefetchAddr
- LDR PC, DataAbortAddr
- DCD 0xb9205f80
- LDR PC, [PC, #-0xff0]
- LDR PC, FIQ_Addr
- ResetAddr DCD ResetInit
- UndefinedAddr DCD Undefined
- SWI_Addr DCD SoftwareInterrupt
- PrefetchAddr DCD PrefetchAbort
- DataAbortAddr DCD DataAbort
- Nouse DCD 0
- IRQ_Addr DCD 0
- FIQ_Addr DCD FIQ_Handler
- ;未定义指令
- Undefined
- B Undefined
- ;软中断
- SoftwareInterrupt
- B SoftwareInterrupt
- ;取指令中止
- PrefetchAbort
- B PrefetchAbort
- ;取数据中止
- DataAbort
- B DataAbort
- ;快速中断
- FIQ_Handler
- STMFD SP!, {R0-R3,R12,LR}
- BL FIQ_Exception
- LDMFD SP!, {R0-R3,R12,LR}
- SUBS PC, LR, #4
-
- ;********************************************************************************************************/
- InitStack
- MOV R0, LR
- ;Build the SVC stack
- ;设置管理模式堆栈
- MSR CPSR_c, #0xd3
- LDR SP, StackSvc
- ;Build the IRQ stack
- ;设置中断模式堆栈
- MSR CPSR_c, #0xd2
- LDR SP, StackIrq
- ;Build the FIQ stack
- ;设置快速中断模式堆栈
- MSR CPSR_c, #0xd1
- LDR SP, StackFiq
- ;Build the DATAABORT stack
- ;设置中止模式堆栈
- MSR CPSR_c, #0xd7
- LDR SP, StackAbt
- ;Build the UDF stack
- ;设置未定义模式堆栈
- MSR CPSR_c, #0xdb
- LDR SP, StackUnd
- ;Build the SYS stack
- ;设置系统模式堆栈
- MSR CPSR_c, #0x5f
- LDR SP, =StackUsr
- MOV PC, R0
- ;********************************************************************************************************/
- ResetInit
-
- BL InitStack ;初始化堆栈 Initialize the stack
- BL TargetResetInit ;目标板基本初始化 Initialize the target board
- ;跳转到c语言入口 Jump to the entry point of C program
- B __main
- ;********************************************************************************************************/
- __user_initial_stackheap
- LDR r0,=bottom_of_heap
- ; LDR r1,=StackUsr
- MOV pc,lr
- StackSvc DCD SvcStackSpace + (SVC_STACK_LEGTH - 1)* 4
- StackIrq DCD IrqStackSpace + (IRQ_STACK_LEGTH - 1)* 4
- StackFiq DCD FiqStackSpace + (FIQ_STACK_LEGTH - 1)* 4
- StackAbt DCD AbtStackSpace + (ABT_STACK_LEGTH - 1)* 4
- StackUnd DCD UndtStackSpace + (UND_STACK_LEGTH - 1)* 4
-
- ;/* 分配堆栈空间 */
- AREA MyStacks, DATA, NOINIT, ALIGN=2
- SvcStackSpace SPACE SVC_STACK_LEGTH * 4 ;Stack spaces for Administration Mode 管理模式堆栈空间
- IrqStackSpace SPACE IRQ_STACK_LEGTH * 4 ;Stack spaces for Interrupt ReQuest Mode 中断模式堆栈空间
- FiqStackSpace SPACE FIQ_STACK_LEGTH * 4 ;Stack spaces for Fast Interrupt reQuest Mode 快速中断模式堆栈空间
- AbtStackSpace SPACE ABT_STACK_LEGTH * 4 ;Stack spaces for Suspend Mode 中止义模式堆栈空间
- UndtStackSpace SPACE UND_STACK_LEGTH * 4 ;Stack spaces for Undefined Mode 未定义模式堆栈
- AREA Heap, DATA, NOINIT
- bottom_of_heap SPACE 1
- AREA Stacks, DATA, NOINIT
- StackUsr
- END
- ;/*********************************************************************************************************
- ;** End Of File
- ;********************************************************************************************************/