// using ld the gnu linker
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/4/pdf/Using_ld_the_GNU_Linker/Red_Hat_Enterprise_Linux-4-Using_ld_the_GNU_Linker-en-US.pdf
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http://tldp.org/HOWTO/Linux-i386-Boot-Code-HOWTO/makefiles.html
http://www.cnblogs.com/hicjiajia/archive/2012/07/03/2574376.html
http://lli_njupt.0fees.net/ar01s07.html?ckattempt=1
http://blog.csdn.net/innost/article/details/6730660
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