[轉]WinCE 錯誤中斷(Data Abort、Raise Exception、Prefetch abort) @ H's 手札

Elay: 參考來源文章，整理出快速參考的簡單版，但是每篇原文都很有用。

當Windows Mobile產生錯誤時，有三種常見錯誤，格式如下：

Exception type: Thread=%x Proc=%x '%s' AKY=%x PC=%x(%s+%x) RA=%x(%s+%x) BVA=%x FSR=%x

- Thread = PTHREAD address

- Proc = PPROCESS address 『Process name'

- AKY = Access key, MSDN中對AKY的解釋是「Process slot bitmask corresponding to the processes the excepting thread has access to.」

For example, the above exception is 0x00000005, which corresponds to:

Nk.exe 0x00000001

Shell32.exe 0x00000004

簡單的說，就是32個slot都會有一個對應的Key，當意外產生時，我們可以藉由出現的數值去推斷這個錯誤（意外）產生有哪些程序去參與。

- PC = Program counter (Module name + Offset)

- RA = Return address (Module name + Offset)

- FSR = Fault status register，MSDN中對FSR的解釋是：「The FSR represents several flags that will help you understand the nature of your exception.」 For ARM devices the following flags can be set:

#define FSR_ALIGNMENT 0x01

#define FSR_PAGE_ERROR 0x02

#define FSR_TRANSLATION 0x05

#define FSR_DOMAIN_ERROR 0x09

#define FSR_PERMISSION 0x0D

Using the example above gives us:

FSR=00000007 == FSR_PAGE_ERROR | FSR_TRANSLATION

簡單的說就是對錯誤或是意外產生的分類，從FSR中，我們可以發現哪幾種類型的錯誤再次的意外中出現。

另外一個例子，以下面為例:

Data Abort: Thread=9352cc9c Proc=90876ea0 'shell32.exe'
AKY=00000005 PC=03f74680(coredll.dll+0x00014680) RA=03257104(aygshell.dll+0x00037104)
BVA=060000e0 FSR=00000007

AKY 的 value是bitmask，上例中 AKY=00000005，代表access 這個region 的thread 有 00000001 和 00000004。配合下面這個table (build map ?)

Name                   VMBase           AccessKey     TrustLevel    hProcess  
btstereoappui.exe   0x1A000000    0x00001000    Full               0xB30E2766
connmgr.exe          0x16000000    0x00000400    Full               0x5311091E
cprog.exe              0x1C000000    0x00002000    Full                0xF3030772
device.exe              0x0A000000    0x00000010    Full               0xB3CEC78E
filesys.exe              0x04000000    0x00000002    Full               0x13EEE762
gwes.exe               0x0C000000    0x00000020    Full               0x737A498A
nk.exe                   0xC2000000    0x00000001    Full               0x13EFF002
pmsnserver.exe      0x10000000    0x00000080    Full               0x5333CD86
poutlook.exe          0x14000000    0x00000200    Full               0xD308FA02
sddaemon.exe        0x12000000    0x00000100    Full               0x7314C62A
services.exe           0x0E000000    0x00000040    Full               0x7352CFAA
shell.exe                0x08000000    0x00000008    Full               0xD3CD7A82
shell32.exe            0x06000000    0x00000004    Full               0xD352CEDE
srvtrust.exe           0x18000000    0x00000800    Full               0x33105BCA

就是 nk.exe 和 shell32.exe

而PC 就是 Program Counter，如果找得到，則會print出該位址的module和 offset coredll.dll+0x00014680，所以去找 coredll 的map file，可以找到..

0001:00013638       GetWindowLongW     10014638 f   coredll_ALL:twinuser.obj
0001:00013648       BeginPaint                 10014648 f   coredll_ALL:twinuser.obj
0001:000136cc        EndPaint                   100146cc f    coredll_ALL:twinuser.obj
0001:00013750       GetDC                      10014750 f    coredll_ALL:twinuser.obj
0001:000137d4       ReleaseDC                 100147d4 f   coredll_ALL:twinuser.obj
0001:00013858       GetParent                  10014858 f   coredll_ALL:twinuser.obj

知道是 BeginPaint 這裡有問題。

RA 是 Return Address