Month: February 2013

qemu single step will fail if current EIP hit a breakpoint

I use the following code to insert a breakpoint in physical address 0x1600000 qemu successfully hit the breakpoint and stop, then i try to single-step by the following code: Nothing happened, the EIP still stay in 0x1600000, but if i delete the breakpoint, the single step just work again. Am I missed something? read count…
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2013/02/14 0

when you debugging qemu, it will keep firing SIGUSR1 so gdb will always catched in some breakpooints that are not defined by you

when you debugging qemu, it will keep firing SIGUSR1 so gdb will always catched in some breakpooints that are not defined by you, to turn off the SIGUSR1, you have to: (gdb) info signal SIGUSR1 Signal Stop Print Pass to program Description SIGUSR1 Yes Yes Yes User defined signal 1 And if deemed to not…
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2013/02/12 0

linker script offset seems crazy

linker script offset seems crazy, take a look the following two pictures   read count : 533


2013/02/09 0

compile grub2 : error: ‘gets’ undeclared here

if you compile grub2 , you may get “error: ‘gets’ undeclared here yum”, to fix it, run the following command: sed -i -e ‘/gets is a security/d’ grub-core/gnulib/stdio.in.h   read count : 1204


2013/02/09 0

compile 64 bits newlib on 64 bits linux host

If you compile newlib in x86-64 host and want to have 64-bits newlib, you have to add “–disable-multilib“, otherwise you will get the following error: read count : 738


2013/02/03 0