变量被修改的问题

wangxiaofei6485 · 发表于 2013-10-1 17:23:05

LPC4337 + Keil4 Level0优化

通过Debug监视一个局部变量，发现其在一个毫不相干的判断语句后，其值被修改了。

if (fp->flag & FA__ERROR) return FR_INT_ERR;

复制代码

上面的代码就是执行后被监视的局部变量值发生变化的语句。在注释后发现其下一条语句依然会把监视的值改掉。
是栈出了问题么？

lcofjp · 发表于 2013-10-1 21:02:34

一般这种问题还是需要自己调试，看汇编代码等，看变量的地址，如果是按正常顺序执行的话，肯定是在操作内存地址的时候变量才会变化。

Gorgon_Meducer · 发表于 2013-10-1 23:02:36

检查系统栈是否足够大……
如果可能，拉map文件出来，大家才好帮你分析

cxning · 发表于 2013-10-2 01:41:22

也许是在线仿真的问题。
写个小程序煤烧进IC里做LED指示看看

wangxiaofei6485 · 发表于 2013-10-2 16:58:36

Gorgon_Meducer 发表于 2013-10-1 23:02
检查系统栈是否足够大……
如果可能，拉map文件出来，大家才好帮你分析

这个是完整启动文件：

Stack_Size    EQU    0x0007000

            AREA STACK, NOINIT, READWRITE, ALIGN=3
Stack_Mem    SPACE Stack_Size
__initial_sp

; <h> Heap Configuration
; <o>  Heap Size (in Bytes) <0x0-0xFFFFFFFF:8>
; </h>

;Heap_Size    EQU    0x00008000

Heap_Size    EQU    0x00000000

            AREA HEAP, NOINIT, READWRITE, ALIGN=3
__heap_base
Heap_Mem       SPACE Heap_Size
__heap_limit

EXTERN xPortSysTickHandler
EXTERN xPortPendSVHandler
EXTERN vPortSVCHandler

            PRESERVE8
            THUMB

; Vector Table Mapped to Address 0 at Reset

            AREA RESET, DATA, READONLY
            EXPORT  __Vectors

Sign_Value EQU 0x5A5A5A5A

__Vectors    DCD    __initial_sp               ; 0 Top of Stack
            DCD    Reset_Handler          ; 1 Reset Handler
            DCD    NMI_Handler                ; 2 NMI Handler
            DCD    HardFault_Handler          ; 3 Hard Fault Handler
            DCD    MemManage_Handler          ; 4 MPU Fault Handler
            DCD    BusFault_Handler       ; 5 Bus Fault Handler
            DCD    UsageFault_Handler         ; 6 Usage Fault Handler
            DCD    Sign_Value             ; 7 Reserved
            DCD    UnHandled_Vector            ; 8 Reserved
            DCD    UnHandled_Vector            ; 9 Reserved
            DCD    UnHandled_Vector       ; 10 Reserved
            DCD    vPortSVCHandler             ; 11 FreeRTOS SVCall Handler
            DCD    DebugMon_Handler       ; 12 Debug Monitor Handler
            DCD    UnHandled_Vector       ; 13 Reserved
            DCD    xPortPendSVHandler          ; 14 FreeRTOS PendSV Handler
            DCD    xPortSysTickHandler         ; 15 FreeRTOS SysTick Handler

            ; External Interrupts
DCD DAC_IRQHandler      ; 16 D/A Converter
DCD MX_CORE_IRQHandler ; 17 M0/M4 IRQ handler (LPC43XX ONLY)
DCD DMA_IRQHandler ; 18 General Purpose DMA
DCD UnHandled_Vector ; 19 Reserved
DCD FLASHEEPROM_IRQHandler ; 20 ORed flash bank A, flash bank B, EEPROM interrupts
DCD ETH_IRQHandler ; 21 Ethernet
DCD SDIO_IRQHandler ; 22 SD/MMC
DCD LCD_IRQHandler ; 23 LCD
DCD USB0_IRQHandler ; 24 USB0
DCD USB1_IRQHandler ; 25 USB1
DCD SCT_IRQHandler ; 26 State Configurable Timer
DCD RIT_IRQHandler ; 27 Repetitive Interrupt Timer
DCD TIMER0_IRQHandler ; 28 Timer0
DCD TIMER1_IRQHandler ; 29 Timer1
DCD TIMER2_IRQHandler ; 30 Timer2
DCD TIMER3_IRQHandler ; 31 Timer3
DCD MCPWM_IRQHandler ; 32 Motor Control PWM
DCD ADC0_IRQHandler ; 33 A/D Converter 0
DCD I2C0_IRQHandler ; 34 I2C0
DCD I2C1_IRQHandler ; 35 I2C1
DCD SPI_IRQHandler ; 36 SPI (LPC43XX ONLY)
DCD ADC1_IRQHandler ; 37 A/D Converter 1
DCD SSP0_IRQHandler ; 38 SSP0
DCD SSP1_IRQHandler ; 39 SSP1
DCD UART0_IRQHandler ; 40 UART0
DCD UART1_IRQHandler ; 41 UART1
DCD UART2_IRQHandler ; 42 UART2
DCD UART3_IRQHandler ; 43 UART3
DCD I2S0_IRQHandler ; 44 I2S0
DCD I2S1_IRQHandler ; 45 I2S1
DCD SPIFI_IRQHandler ; 46 SPI Flash Interface
DCD SGPIO_IRQHandler ; 47 SGPIO (LPC43XX ONLY)
DCD GPIO0_IRQHandler ; 48 GPIO0
DCD GPIO1_IRQHandler ; 49 GPIO1
DCD GPIO2_IRQHandler ; 50 GPIO2
DCD GPIO3_IRQHandler ; 51 GPIO3
DCD GPIO4_IRQHandler ; 52 GPIO4
DCD GPIO5_IRQHandler ; 53 GPIO5
DCD GPIO6_IRQHandler ; 54 GPIO6
DCD GPIO7_IRQHandler ; 55 GPIO7
DCD GINT0_IRQHandler ; 56 GINT0
DCD GINT1_IRQHandler ; 57 GINT1
DCD EVRT_IRQHandler ; 58 Event Router
DCD CAN1_IRQHandler ; 59 C_CAN1
DCD UnHandled_Vector ; 60 Reserved
DCD VADC_IRQHandler ; 61 VADC
DCD ATIMER_IRQHandler ; 62 ATIMER
DCD RTC_IRQHandler ; 63 RTC
DCD UnHandled_Vector ; 64 Reserved
DCD WDT_IRQHandler ; 65 WDT
DCD UnHandled_Vector ; 66 M0s
DCD CAN0_IRQHandler ; 67 C_CAN0
DCD QEI_IRQHandler ; 68 QEI

;             IF    :LNOT::DEF:NO_CRP
;             AREA |.ARM.__at_0x02FC|, CODE, READONLY
;CRP_Key       DCD    0xFFFFFFFF
;             ENDIF

            AREA |.text|, CODE, READONLY

; Reset Handler

Reset_Handler PROC
            EXPORT  Reset_Handler          [WEAK]
            IMPORT  __main
IMPORT  SystemInit
LDR R0, =SystemInit
BLX R0
            LDR    R0, =__main
            BX    R0
            ENDP

; Dummy Exception Handlers (infinite loops which can be modified)

NMI_Handler    PROC
            EXPORT  NMI_Handler             [WEAK]
            B    .
            ENDP
HardFault_Handler\
            PROC
            EXPORT  HardFault_Handler       [WEAK]
            B    .
            ENDP
MemManage_Handler\
            PROC
            EXPORT  MemManage_Handler       [WEAK]
            B    .
            ENDP
BusFault_Handler\
            PROC
            EXPORT  BusFault_Handler       [WEAK]
            B    .
            ENDP
UsageFault_Handler\
            PROC
            EXPORT  UsageFault_Handler       [WEAK]
            B    .
            ENDP
SVC_Handler    PROC
            EXPORT  SVC_Handler             [WEAK]
            B    .
            ENDP
DebugMon_Handler\
            PROC
            EXPORT  DebugMon_Handler       [WEAK]
            B    .
            ENDP
PendSV_Handler  PROC
            EXPORT  PendSV_Handler          [WEAK]
            B    .
            ENDP
SysTick_Handler PROC
            EXPORT  SysTick_Handler          [WEAK]
            B    .
            ENDP
UnHandled_Vector PROC
            EXPORT  UnHandled_Vector       [WEAK]
            B    .
            ENDP

Default_Handler PROC

            EXPORT DAC_IRQHandler         [WEAK]
            EXPORT MX_CORE_IRQHandler       [WEAK]
EXPORT DMA_IRQHandler       [WEAK]
            EXPORT FLASHEEPROM_IRQHandler [WEAK]
EXPORT ETH_IRQHandler         [WEAK]
EXPORT SDIO_IRQHandler         [WEAK]
EXPORT LCD_IRQHandler         [WEAK]
EXPORT USB0_IRQHandler         [WEAK]
EXPORT USB1_IRQHandler         [WEAK]
EXPORT SCT_IRQHandler         [WEAK]
EXPORT RIT_IRQHandler         [WEAK]
EXPORT TIMER0_IRQHandler [WEAK]
EXPORT TIMER1_IRQHandler [WEAK]
EXPORT TIMER2_IRQHandler [WEAK]
EXPORT TIMER3_IRQHandler [WEAK]
EXPORT MCPWM_IRQHandler         [WEAK]
EXPORT ADC0_IRQHandler         [WEAK]
EXPORT I2C0_IRQHandler         [WEAK]
EXPORT I2C1_IRQHandler         [WEAK]
            EXPORT SPI_IRQHandler         [WEAK]
EXPORT ADC1_IRQHandler       [WEAK]
EXPORT SSP0_IRQHandler         [WEAK]
EXPORT SSP1_IRQHandler         [WEAK]
EXPORT UART0_IRQHandler         [WEAK]
EXPORT UART1_IRQHandler         [WEAK]
EXPORT UART2_IRQHandler         [WEAK]
EXPORT UART3_IRQHandler         [WEAK]
EXPORT I2S0_IRQHandler         [WEAK]
EXPORT I2S1_IRQHandler         [WEAK]
EXPORT SPIFI_IRQHandler      [WEAK]
EXPORT SGPIO_IRQHandler      [WEAK]
EXPORT GPIO0_IRQHandler          [WEAK]
EXPORT GPIO1_IRQHandler      [WEAK]
EXPORT GPIO2_IRQHandler          [WEAK]
EXPORT GPIO3_IRQHandler      [WEAK]
EXPORT GPIO4_IRQHandler      [WEAK]
EXPORT GPIO5_IRQHandler      [WEAK]
EXPORT GPIO6_IRQHandler          [WEAK]
EXPORT GPIO7_IRQHandler          [WEAK]
EXPORT GINT0_IRQHandler          [WEAK]
EXPORT GINT1_IRQHandler          [WEAK]
EXPORT EVRT_IRQHandler       [WEAK]
EXPORT CAN1_IRQHandler         [WEAK]
EXPORT VADC_IRQHandler         [WEAK]
EXPORT ATIMER_IRQHandler [WEAK]
EXPORT RTC_IRQHandler         [WEAK]
EXPORT WDT_IRQHandler         [WEAK]
EXPORT CAN0_IRQHandler         [WEAK]
EXPORT QEI_IRQHandler         [WEAK]

DAC_IRQHandler
MX_CORE_IRQHandler
DMA_IRQHandler
FLASHEEPROM_IRQHandler
ETH_IRQHandler
SDIO_IRQHandler
LCD_IRQHandler
USB0_IRQHandler
USB1_IRQHandler
SCT_IRQHandler
RIT_IRQHandler
TIMER0_IRQHandler
TIMER1_IRQHandler
TIMER2_IRQHandler
TIMER3_IRQHandler
MCPWM_IRQHandler
ADC0_IRQHandler
I2C0_IRQHandler
I2C1_IRQHandler
SPI_IRQHandler
ADC1_IRQHandler
SSP0_IRQHandler
SSP1_IRQHandler
UART0_IRQHandler
UART1_IRQHandler
UART2_IRQHandler
UART3_IRQHandler
I2S0_IRQHandler
I2S1_IRQHandler
SPIFI_IRQHandler
SGPIO_IRQHandler
GPIO0_IRQHandler
GPIO1_IRQHandler
GPIO2_IRQHandler
GPIO3_IRQHandler
GPIO4_IRQHandler
GPIO5_IRQHandler
GPIO6_IRQHandler
GPIO7_IRQHandler
GINT0_IRQHandler
GINT1_IRQHandler
EVRT_IRQHandler
CAN1_IRQHandler
VADC_IRQHandler
ATIMER_IRQHandler
RTC_IRQHandler
WDT_IRQHandler
CAN0_IRQHandler
QEI_IRQHandler

            B    .

            ENDP

            ALIGN

; User Initial Stack & Heap

            IF    :DEF:__MICROLIB

            EXPORT  __initial_sp
            EXPORT  __heap_base
            EXPORT  __heap_limit

            ELSE

            IMPORT  __use_two_region_memory
            EXPORT  __user_initial_stackheap
__user_initial_stackheap

            LDR    R0, =  Heap_Mem
            LDR    R1, =(Stack_Mem + Stack_Size)
            LDR    R2, = (Heap_Mem +  Heap_Size)
            LDR    R3, = Stack_Mem
            BX    LR

            ALIGN

            ENDIF

END

wangxiaofei6485 · 发表于 2013-10-2 17:00:26

Gorgon_Meducer 发表于 2013-10-1 23:02
检查系统栈是否足够大……
如果可能，拉map文件出来，大家才好帮你分析

栈已经分配的很大了，堆没用到就没分配。内存一共是136K

68336016 · 发表于 2013-10-2 17:09:21

是否有些变量之间值传递没考虑位长？

Gorgon_Meducer · 发表于 2013-10-2 17:24:11

wangxiaofei6485 发表于 2013-10-2 17:00
栈已经分配的很大了，堆没用到就没分配。内存一共是136K

变量被修改的另外一种情况就是栈过大，直接侵入到bss段或者no_init段了

wangxiaofei6485 · 发表于 2013-10-8 10:14:36

本帖最后由 wangxiaofei6485 于 2013-10-8 10:17 编辑

Gorgon_Meducer 发表于 2013-10-2 17:24
变量被修改的另外一种情况就是栈过大，直接侵入到bss段或者no_init段了

之前发错了,以为MAP文件就是启动文件。现在重新发一份，麻烦看一下。
附件：完整的map文件

Memory Map of the image

  Image Entry point : 0x1a000115

  Load Region LR_IROM1 (Base: 0x1a000000, Size: 0x00008150, Max: 0x00080000, ABSOLUTE, COMPRESSED[0x0000802c])

Execution Region RW_IRAM1 (Base: 0x10000000, Size: 0x00000c00, Max: 0x00008000, ABSOLUTE)

Base Addr Size       Type Attr    Idx E Section Name       Object

0x10000000 0x00000c00 Zero RW       8448 .bss             endpoint.o

Execution Region RW_RAM3 (Base: 0x10080000, Size: 0x00003200, Max: 0x0000a000, ABSOLUTE)

Base Addr Size       Type Attr    Idx E Section Name       Object

0x10080000 0x00003200 Zero RW       1524 .bss             board_keil_mcb_18574357.o

Execution Region ER_IROM1 (Base: 0x1a000000, Size: 0x00008000, Max: 0x00080000, ABSOLUTE)

Base Addr Size       Type Attr    Idx E Section Name       Object
。。。。。
Execution Region RW_IRAM2 (Base: 0x20000000, Size: 0x00008cc8, Max: 0x00010000, ABSOLUTE, COMPRESSED[0x0000002c])

Base Addr Size       Type Attr    Idx E Section Name       Object

0x20000000 0x00000018 Data RW       421 .data             generichid.o
0x20000018 0x00000010 Data RW       1117 .data             drv_lpc43xx.o
0x20000028 0x00000081 Data RW       1526 .data             board_keil_mcb_18574357.o
0x200000a9 0x00000003 PAD
0x200000ac 0x0000003c Data RW       5262 .data             tasks.o
0x200000e8 0x0000000e Data RW       8211 .data             usbtask.o
0x200000f6 0x00000003 Data RW       8382 .data             devicestandardreq.o
0x200000f9 0x00000003 PAD
0x200000fc 0x00000034 Data RW       8449 .data             endpoint.o
0x20000130 0x00000003 Data RW       8627 .data             usbcontroller.o
0x20000133 0x00000002 Data RW       8682 .data             hal_lpc18xx.o
0x20000135 0x00000001 PAD
0x20000136 0x00000011 Data RW       9109 .data             mrfi.o
0x20000147 0x00000001 PAD
0x20000148 0x00000006 Data RW       9594 .data             ff.o
0x2000014e 0x00000002 PAD
0x20000150 0x0000003f Zero RW       420 .bss             generichid.o
0x2000018f 0x00000001 PAD
0x20000190 0x000000fc Zero RW       5261 .bss             tasks.o
0x2000028c 0x0000026c Zero RW       7880 .bss             lpc18xx_43xx_emac.o
0x200004f8 0x00000308 PAD
0x20000800 0x000012b0 Zero RW       8825 .bss             endpoint_lpc18xx.o
0x20001ab0 0x00000014 Zero RW       8989 .bss             mx25l1606edrv.o
0x20001ac4 0x00000203 Zero RW       9107 .bss             mrfi.o
0x20001cc7 0x00000001 PAD
0x20001cc8 0x00007000 Zero RW       1404 STACK             keil_freertos_startup_lpc18xx43xx.o

  Load Region LR_IROM2 (Base: 0x1b000000, Size: 0x0002acc8, Max: 0x00080000, ABSOLUTE)

Execution Region ER_IROM2 (Base: 0x1b000000, Size: 0x0002acc8, Max: 0x00080000, ABSOLUTE)

Base Addr Size       Type Attr    Idx E Section Name       Object

0x1b000000 0x0002acc8 Data RO       9844 .constdata       cc936.o
   Code (inc. data) RO Data RW Data ZI Data    Debug Library Member Name

      92       0       0       0       0       0 __dczerorl2.o
      0       0       0       0       0       0 entry.o
      0       0       0       0       0       0 entry10a.o
      0       0       0       0       0       0 entry11a.o
      8       4       0       0       0       0 entry2.o
      4       0       0       0       0       0 entry5.o
      0       0       0       0       0       0 entry7b.o
      0       0       0       0       0       0 entry8b.o
      8       4       0       0       0       0 entry9a.o
      30       0       0       0       0       0 handlers.o
      36       8       0       0       0       68 init.o
      30       0       0       0       0       68 llshl.o
      32       0       0       0       0       68 llushr.o
      36       0       0       0       0       68 memcpya.o
      36       0       0       0       0       108 memseta.o
   1150       54       0       0       0       352 printf8.o
      98       0       0       0       0       92 uldiv.o
   160       26       0       0       0       92 amic.o
   276       24       64       0       0       96 atmel.o
   220       26       0       0       0       88 chi.o
   184       12       0       0       0       96 eon.o
   188       24       0       0       0       96 esmt.o
   352       44       0       0       0       232 falcon_details.o
   176       20       0       0       0       96 giga.o
   404       28       130       0       0       92 macronix.o
   376       40       0       0       0       184 numonyx.o
   236       24       0       0       0       112 spansion.o
   4848       116       84       0       0    1148 spifi_rom_api.o
   184       26       120       0       0       88 sst.o
   252       20       0       0       0       172 winbond.o

----------------------------------------------------------------------
   9418       500       400       0       0    3416 Library Totals
      2       0       2       0       0       0 (incl. Padding)

----------------------------------------------------------------------

   Code (inc. data) RO Data RW Data ZI Data    Debug Library Name

   1560       70       0       0       0       824 mc_w.l
   7856       430       398       0       0    2592 spifi_drv_M4.lib

----------------------------------------------------------------------
   9418       500       400       0       0    3416 Library Totals

----------------------------------------------------------------------

==============================================================================

   Code (inc. data) RO Data RW Data ZI Data    Debug

   31100    1804    176972       336    51576    423473 Grand Totals
   31100    1804    176972       44    51576    423473 ELF Image Totals (compressed)
   31100    1804    176972       44       0       0 ROM Totals

==============================================================================

Total RO  Size (Code + RO Data)             208072 ( 203.20kB)
Total RW  Size (RW Data + ZI Data)          51912 (  50.70kB)
Total ROM Size (Code + RO Data + RW Data)    208116 ( 203.24kB)

==============================================================================

myxiaonia · 发表于 2013-11-10 23:25:24

那得看你的局部变量是不是寄存器变量，注意局部变量是有很大可能被优化为寄存器类型，所以局部变量值在仿真时是不确定的
你最好还是根据反汇编看特定的寄存器值

奮闘ing · 发表于 2013-11-11 09:10:24

学习啊，自己懂得太少了！~~~

变量被修改的问题

阿莫论坛20周年了！感谢大家的支持与爱护！！

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