compilers

1.cross compilers , host x, target y -- executable x, object-file y
2.cross debugger, host x, target y --- executable x, interprets y

linux kgdb basic idea

1.enable kernel hacking serial option ,select serial hardware
2.change kernel boot parameters,kgdbwait
3.when kernel boots it waits
4.on host open cross debugger,open vmlinuz from the kernel source root,set source path connect
5.to test if working set a well know system entry break point
6.press continue
7.it should hit the breakpoint
8.system.map is not necessary on target, it is used to resolve symbols in case of crashes on the kernel