Inline assembly in kernel module -


the inline assembly in kernel module code following:

   u64 cade_seg;    __asm__ __volatile__ ("mov %%cs %0": "=r" (code_seg));

however, when compiles (as kernel module), error thrown "junk rax after register." there wrong inline assembly code above.?

update: replacing %%cs other register, %%rax, error persists.

in assembly language, registers should separated comma:

__asm__ __volatile__ ("mov %%cs, %0": "=r" (code_seg));

also segment selectors 16 bit type.


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