我用的ADS1.2+ H-JTAG调试的LPC2364，AXD仿真的时候，
Vectors LDR PC, Reset_Addr ;0
LDR PC, Undef_Addr ;4
LDR PC, SWI_Addr ;8
LDR PC, PAbt_Addr ;c
LDR PC, DAbt_Addr ;10
NOP ;14 Reserved Vector
从Vectors行开始单步执行，LDR PC, Reset_Addr 执行之后不是跳转，而是顺序执行LDR PC, Undef_Addr，后面也全部相同，从Regisers窗口观察Current里的pc值，和指令相对应,00>04>08>0c。之前还有遇到就是进入main()后,一部分函数执行完毕后，继续执行剩下的函数，结果到函数返回的‘}’后，有时候跳到数据或指令异常，或跳到main()后紧跟的那个'{'行首，感觉很怪异，想不出什么解决办法，感觉和启动代码，或者scatter文件相关。
启动代码：
PRESERVE8
; Standard definitions of Mode bits and Interrupt (I & F) flags in PSRs
Mode_USR EQU 0x10
Mode_FIQ EQU 0x11
Mode_IRQ EQU 0x12
Mode_SVC EQU 0x13
Mode_ABT EQU 0x17
Mode_UND EQU 0x1B
Mode_SYS EQU 0x1F
I_Bit EQU 0x80 ; when I bit is set, IRQ is disabled
F_Bit EQU 0x40 ; when F bit is set, FIQ is disabled
;// <h> Stack Configuration (Stack Sizes in Bytes)
;// <o0> Undefined Mode <0x0-0xFFFFFFFF:8>
;// <o1> Supervisor Mode <0x0-0xFFFFFFFF:8>
;// <o2> Abort Mode <0x0-0xFFFFFFFF:8>
;// <o3> Fast Interrupt Mode <0x0-0xFFFFFFFF:8>
;// <o4> Interrupt Mode <0x0-0xFFFFFFFF:8>
;// <o5> User/System Mode <0x0-0xFFFFFFFF:8>
;// </h>
;定义堆栈的大小,最终工作在系统模式，栈名StackUsr，只给了起始位置，未指定大小
SVC_STACK_LEGTH EQU 0 ;单位为字
FIQ_STACK_LEGTH EQU 0
IRQ_STACK_LEGTH EQU 512
ABT_STACK_LEGTH EQU 0
UND_STACK_LEGTH EQU 0
;USR_STACK_LEGTH EQU 1024 ;设定用户模式栈
Heap_Size EQU 1024
IMPORT __use_no_semihosting_swi
IMPORT __use_two_region_memory
IMPORT TargetResetInit
IMPORT FIQ_Exception
IMPORT __main
;The emported labels
;给外部使用的标号在这声明
; EXPORT bottom_of_heap
EXPORT bottom_of_Stacks
; EXPORT top_of_heap
EXPORT StackUsr
EXPORT Reset_Handler
EXPORT __user_initial_stackheap
; Area Definition and Entry Point
; Startup Code must be linked first at Address at which it expects to run.
CODE32
AREA RESET, CODE, READONLY
ENTRY
; Exception Vectors
; Mapped to Address 0.
; Absolute addressing mode must be used.
; Dummy Handlers are implemented as infinite loops which can be modified.
Vectors LDR PC, Reset_Addr ;0
LDR PC, Undef_Addr ;4
LDR PC, SWI_Addr ;8
LDR PC, PAbt_Addr ;c
LDR PC, DAbt_Addr ;10
NOP ;14 Reserved Vector
;LDR PC, IRQ_Addr
LDR PC, [PC, #-0x0120] ;18 Vector from VicVectAddr
LDR PC, FIQ_Addr ;1c
Reset_Addr DCD Reset_Handler ;20
Undef_Addr DCD Undef_Handler ;24
SWI_Addr DCD SWI_Handler ;28
PAbt_Addr DCD PAbt_Handler ;2c
DAbt_Addr DCD DAbt_Handler ;20
DCD 0xB9206E28 ;34 Reserved Address
IRQ_Addr DCD IRQ_Handler ;38
FIQ_Addr DCD FIQ_Handler ;3c
Undef_Handler B Undef_Handler ;40
SWI_Handler B SWI_Handler ;44
PAbt_Handler B PAbt_Handler ;48
DAbt_Handler B DAbt_Handler ;4c
IRQ_Handler B IRQ_Handler ;40
FIQ_Handler B FIQ_Handler ;44
Reset_Handler
; Enter Undefined Instruction Mode and set its Stack Pointer
MSR CPSR_c, #Mode_UND:OR:I_Bit:OR:F_Bit
LDR SP, StackUnd
; Enter Abort Mode and set its Stack Pointer
MSR CPSR_c, #Mode_ABT:OR:I_Bit:OR:F_Bit
LDR SP, StackAbt
; Enter FIQ Mode and set its Stack Pointer
MSR CPSR_c, #Mode_FIQ:OR:I_Bit:OR:F_Bit
LDR SP, StackFiq
; Enter IRQ Mode and set its Stack Pointer
MSR CPSR_c, #Mode_IRQ:OR:I_Bit:OR:F_Bit
LDR SP, StackIrq
; Enter Supervisor Mode and set its Stack Pointer
MSR CPSR_c, #Mode_SVC:OR:I_Bit:OR:F_Bit
LDR SP, StackSvc
; Enter Sys Mode and set its Stack Pointer
; MSR CPSR_c, #Mode_SYS:OR:I_Bit:OR:F_Bit
; LDR SP, StackSys
; Enter User Mode and set its Stack Pointer
; MSR CPSR_c, #Mode_USR
MSR CPSR_c, #Mode_SYS:OR:F_Bit
LDR SP, =StackUsr
BL TargetResetInit
; Enter the C code
LDR R0, =__main
BX R0
; B __main
;// <h> Heap Configuration
;// <o> Heap Size (in Bytes) <0x0-0xFFFFFFFF>
;// </h>
; User Initial Stack & Heap
; AREA |.text|, CODE, READONLY
__user_initial_stackheap
LDR R0,=bottom_of_heap ;heap基地址
LDR r1,=StackUsr ;栈基地址
LDR r2,=top_of_heap ;heap长度限制值
LDR r3,=bottom_of_Stacks ;栈长度限制值
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 UndStackSpace + (UND_STACK_LEGTH - 1)* 4
IF :DEF: EN_CRP
IF . >= 0x1fc
INFO 1,"\nThe data at 0x000001fc must be 0x87654321.\nPlease delete some source before this line."
ENDIF
CrpData
WHILE . < 0x1fc
NOP
WEND
CrpData1
DCD 0x87654321 ;/*When the Data is 为0x87654321,user code be protected. 当此数为0x87654321时，用户程序被保护 */
ENDIF
;/* 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
UndStackSpace SPACE UND_STACK_LEGTH * 4 ;Stack spaces for Undefined Mode 未定义模式堆栈
AREA Heap, DATA, NOINIT, ALIGN=3
bottom_of_heap SPACE 1
AREA StackBottom, DATA, NOINIT, ALIGN=3
bottom_of_Stacks SPACE 1
AREA HeapTop, DATA, NOINIT, ALIGN=3
top_of_heap SPACE 1
AREA Stacks, DATA, NOINIT, ALIGN=3
StackUsr SPACE 1
END
scatter文件：
ROM_LOAD 0x0
{
ROM_EXEC 0x0
{
Startup_a.o (RESET, +First)
* (+RO)
}
ERAM 0x40000000 UNINIT
{
* (+RW,+ZI)
}
MYSTACKS +0 UNINIT
{
Startup_a.o (MyStacks)
}
HEAP +0 UNINIT
{
Startup_a.o (Heap)
}
HEAP_BOTTOM +256 UNINIT
{
Startup_a.o (HeapTop)
}
USERSTACKS +0 UNINIT
{
Startup_a.o (StackBottom)
}
STACKS_BOTTOM 0x40002000 UNINIT ;//LPC2364
{
Startup_a.o (Stacks)
}
}
启动代码和scatter文件都是仿照ZLG2200模板写的。
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