dmalloc在嵌入式的開發板上的應用
下面是我實際在開發環境里面做的dmalloc移植時候的一些隨筆
配置PC的dmalloc環境
1. 首先把源碼包打開，進入dmalloc文件夾
2. ./configure 配置Makefile，我是加了線程選項的，所以我的是./configure --enable-threads
3. 生成Makefile之后，需要修改makefile里面的編譯選項 cc和cxx
我用的是DM6467的開發環境，所以我的改成了arm_v5t_le-gcc和arm_v5t_le-g++，這里按照各自需要改成交叉編譯的命令就好。
4. 然后make
5. make install
到此，環境配置完成
進到我們需要測試內存漏洞的代碼，例如我們的代碼在test文件夾里，名字叫mem.c。
1. 進入test
2. 用交叉編譯工具編譯arm_v5t_le-gcc mem.c -o mem -ldmalloc，這里記得加-ldmalloc這個編譯選項，這樣才能使用dmalloc。
執行成功后，生成的mem拷貝到開發板的某個目錄，等待執行。
配置開發板的dmalloc執行環境
1. 從PC的/usr/local/bin 拷貝dmalloc 文件到開發板的目錄/bin
2. 從PC的/usr/local/lib 拷貝相關的.a文件到開發板的目錄/usr/lib
3. 從PC的/usr/local/include 拷貝dmalloc.h 文件到開發板的目錄/usr/include
4. 輸入配置文件命令 export DMALLOC_OPTIONS=log=logname,debug=0x3
這里的logname是一個我們輸入的文件，以后的編譯debug信息會打印進去，0x3是debug的選項，詳細的可以看http://www.linuxfordevices.com/c/a/Linux-For-Devices-Articles/ELJonline-BRMemory-Leak-Detection-in-Embedded-Systems/ 我下面也把編譯選項貼過來了。
將上面編譯好的mem可執行程序拷貝到我們的開發板上，然后運行。
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The following is a list of the tests and the corresponding bits to set in ``debug'':
* none (nil): no functionality (0)
* log-stats (lst): log general statistics (0x1)
* log-non-free (lnf): log non-freed pointers (0x2)
* log-known (lkn): log only known non-freed (0x4)
* log-trans (ltr): log memory transactions (0x8)
* log-admin (lad): log administrative info (0x20)
* log-blocks (lbl): log blocks when heap-map (0x40)
* log-bad-space (lbs): dump space from bad pointers (0x100)
* log-nonfree-space (lns): dump space from non-freed pointers (0x200)
* log-elapsed-time (let): log elapsed time for allocated pointer (0x40000)
* log-current-time (lct): log current time for allocated pointer (0x80000)
* check-fence (cfe): check fencepost errors (0x400)
* check-heap (che): check heap adm structs (0x800)
* check-lists (cli): check free lists (0x1000)
* check-blank (cbl): check mem overwritten by alloc-blank, free-blank (0x2000)
* check-funcs (cfu): check functions (0x4000)
* force-linear (fli): force heap-space to be linear (0x10000)
* catch-signals (csi): shut down program on SIGHUP, SIGINT, SIGTERM (0x20000)
* realloc-copy (rco): copy all re-allocations (0x100000)
* free-blank (fbl): overwrite freed memory space with BLANK_CHAR (0x200000)
* error-abort (eab): abort immediately on error (0x400000)
* alloc-blank (abl): overwrite newly alloced memory with BLANK_CHAR (0x800000)
* heap-check-map (hcm): log heap-map on heap-check (0x1000000)
* print-messages (pme): write messages to stderr (0x2000000)
* catch-null (cnu): abort if no memory available (0x4000000)
* never-reuse (nre): never reuse freed memory (0x8000000)
* allow-free-null (afn): allow the frees of NULL pointers (0x20000000)
* error-dump (edu): dump core on error and then continue (0x40000000)
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