问题描述:从ADS将C代码移植到Keil后,还存在几个警告,于是查阅了下,有篇博文介绍的很详细的

    warning: A1876W:Use of '|' as a synonym for the :OR: operator isdeprecated.



部分源代码:

MSR CPSR_c, #(NoInt|IRQ32Mode) ;进入IRQ模式。

解决方法:把"|"修改为 ":OR:", 如下

MSR CPSR_c, #NoInt:OR:IRQ32Mode ;进入IRQ模式。

warning: A1608W: MOV pc, instructionused, but BX is preferred
解决方法:把MOV pc, 替换为 BX


Error: L6238E: os_cpu_a.o(subr)contains invalid call from '~PRES8 (The user did not require codeto preserve 8-byte aligment of 8-byte data objects)' function to'REQ8 (Code was permitted to depend on the 8-byte aligment of8-byte data items)' function OSIntExit.
解决方法:在汇编程序前面加上 PRESERVE8

PRESERVE8
AREA |subr|, CODE, READONLY
IMPORT OSIntNesting
IMPORT OSTCBCur
IMPORT IsrIRQ

…………


warning: A1085W: Forced user-modeLDM/STM must not be followed by use of banked R8-R14
部分源代码:
STMFD SP,{R3,SP,LR}^ ;系统模式SP→|R0 | 

SUB SP,SP,#12 ;系统模式SP→|SPSR|
解决方法:在两行语句中间加nop,即可解决warning

nop
SUB SP,SP,#12 ;系统模式SP→|SPSR|

error:L6236E:No section matches selector - no section to be FIRST/LAST.
部分源代码:
RuninFlash.sct
LR_ROM1 0x00000000 
{ ; load region
ER_ROM1 0x00000000 0x0200000 
{ ; load address = execution address
*.o (RESET, +First) ;报错的地方
*(InRoot$$Sections)
.ANY (+RO)
}
RW_RAM1 0x0C000000 0x800000 
{ ; RW data
.ANY (+RW +ZI)
}
}
解决方法:
在启动文件,我的是44binit.s 中找到
AREA Init,CODE,READONLY
改为
AREA RESET,CODE,READONLY