ModeMask EQU 0x1F
SVC32Mode EQU 0x13
IRQ32Mode EQU 0x12
FIQ32Mode EQU 0x11
User32Mode EQU 0x10
Abort32Mode EQU 0x17
Undef32Mode EQU 0x1B
IRQ_BIT EQU 0x80
FIQ_BIT EQU 0x40
GBLS MainEntry
MainEntry SETS "main"
IMPORT $MainEntry
;******************************************************
AREA SelfBoot, CODE, READONLY
IMPORT UDF_INS_VECTOR
IMPORT SWI_SVC_VECTOR
IMPORT INS_ABT_VECTOR
IMPORT DAT_ABT_VECTOR
IMPORT IRQ_SVC_VECTOR
IMPORT FIQ_SVC_VECTOR
ENTRY
IF :DEF: |ads$version|
ELSE
EXPORT __main
__main
ENDIF
ResetEntry
b SYS_RST_HANDLER
b UDF_INS_HANDLER
b SWI_SVC_HANDLER
b INS_ABT_HANDLER
b DAT_ABT_HANDLER
b .
b IRQ_SVC_HANDLER
b FIQ_SVC_HANDLER
;******************************************************
MACRO
$Label HANDLER $Vector
$Label
sub lr, lr, #4
stmfd sp!, {r0-r3, lr}
ldr r0, =$Vector
ldr pc, [r0]
ldmfd sp!, {r0-r3, pc}^
MEND
UDF_INS_HANDLER
stmfd sp!, {r0-r3, lr}
ldr r0, =UDF_INS_VECTOR
mov lr, pc
ldr pc, [r0]
ldmfd sp!, {r0-r3, pc}^
SWI_SVC_HANDLER
stmfd sp!, {r0-r3, lr}
ldr r0, =SWI_SVC_VECTOR
mov lr, pc
ldr pc, [r0]
ldmfd sp!, {r0-r3, pc}^
INS_ABT_HANDLER
sub lr, lr, #4
stmfd sp!, {r0-r3, lr}
ldr r0, =INS_ABT_VECTOR
mov lr, pc
ldr pc, [r0]
ldmfd sp!, {r0-r3, pc}^
DAT_ABT_HANDLER
sub lr, lr, #4
stmfd sp!, {r0-r3, lr}
ldr r0, =DAT_ABT_VECTOR
mov lr, pc
ldr pc, [r0]
ldmfd sp!, {r0-r3, pc}^
IRQ_SVC_HANDLER
sub lr, lr, #4
stmfd sp!, {r0-r12, lr}
mrs r0, spsr
stmfd sp!, {r0}
ldr r0, =IRQ_SVC_VECTOR
ldr pc, [r0]
FIQ_SVC_HANDLER
sub lr, lr, #4
stmfd sp!, {r0-r12, lr}
mrs r0, spsr
stmfd sp!, {r0}
ldr r0, =IRQ_SVC_VECTOR
ldr pc, [r0]
;*******************************************************
SYS_RST_HANDLER
mrs r0, cpsr ;enter svc mode and disable irq,fiq
bic r0, r0, #ModeMask
orr r0, r0, #(SVC32Mode :OR: IRQ_BIT :OR: FIQ_BIT)
msr cpsr_c, r0
IMPORT InitSystem
bl InitSystem
adr r0, ResetEntry
ldr r1, BaseOfROM
cmp r0, r1
ldreq r0, TopOfROM
beq InitRamData
ldr r2, =CopyProcBeg
sub r1, r2, r1
add r0, r0, r1
ldr r3, =CopyProcEnd
0
ldmia r0!, {r4-r7}
stmia r2!, {r4-r7}
cmp r2, r3
bcc %B0
ldr r3, TopOfROM
ldr pc, =CopyProcBeg
;***********************************************
CopyProcBeg
0
ldmia r0!, {r4-r11}
stmia r2!, {r4-r11}
cmp r2, r3
bcc %B0
CopyProcEnd
sub r1, r2, r3
sub r0, r0, r1
InitRamData
ldr r2, BaseOfBSS
ldr r3, BaseOfZero
0
cmp r2, r3
ldrcc r1, [r0], #4
strcc r1, [r2], #4
bcc %B0
mov r0, #0
ldr r3, EndOfBSS
1
cmp r2, r3
strcc r0, [r2], #4
bcc %B1
ldr pc, GotoMain
GotoMain DCD $MainEntry
;***********************************************
IMPORT |Image$$RO$$Base| ; ROM code start
IMPORT |Image$$RO$$Limit| ; RAM data starts after ROM program
IMPORT |Image$$RW$$Base| ; Pre-initialised variables
IMPORT |Image$$ZI$$Base| ; uninitialised variables
IMPORT |Image$$ZI$$Limit| ; End of variable RAM space
BaseOfROM DCD |Image$$RO$$Base|
TopOfROM DCD |Image$$RO$$Limit|
BaseOfBSS DCD |Image$$RW$$Base|
BaseOfZero DCD |Image$$ZI$$Base|
EndOfBSS DCD |Image$$ZI$$Limit|
EXPORT GetBaseOfROM
EXPORT GetEndOfROM
EXPORT GetBaseOfBSS
EXPORT GetBaseOfZero
EXPORT GetEndOfBSS
GetBaseOfROM
ldr r0, BaseOfROM
mov pc, lr
GetEndOfROM
ldr r0, TopOfROM
mov pc, lr
GetBaseOfBSS
ldr r0, BaseOfBSS
mov pc, lr
GetBaseOfZero
ldr r0, BaseOfZero
mov pc, lr
GetEndOfBSS
ldr r0, EndOfBSS
mov pc, lr
;***********************************************
END
直接把工程所有的空间都设置到RAM区，生成的BIN文件烧FLASH就可以。
CopyProcBeg
0
ldmia r0!, {r4-r11}
stmia r2!, {r4-r11}
cmp r2, r3
bcc %B0
CopyProcEnd
上面这段负责从FLASH搬移代码
adr r0, ResetEntry
ldr r1, BaseOfROM
cmp r0, r1
ldreq r0, TopOfROM
beq InitRamData
上面这段，简单的说，就是判断代码从FLASH执行还是从RAM执行。
Image$$RO$$Base 这些是ADS连接器预定意的，KEIL也有吧，
有了这段启动代码，存储器空间怎么设置都为所谓。
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