On Sat, 21 Apr 2001, Fergal Daly wrote:
> The bit that's still really confusing me is where is gcc getting the capital
> X from, I have grepped all the .h and .c files of 2.2.17 and 2.2.19 and
> there is no mention of put_user_X, only put_user_x. Any idea what that's
> about?
I think the whole point is there is no put_user_X. So if you try and
do a put_user with something that's more the 4 bytes, it won't link.
If you look at the cpp output, it's the default branch
default: __asm__ __volatile__("call __put_user_" "X"
This doesn't work without optimising (-fthread-jumps, I think) turned
on because with this turned on all defunct branches of the switch get
optimised away so there are references to put_user_{1,2,4,X}. If you
do have it turned on, you're left with only a reference to the
put_user you need, and if that's put_user_X you're screwed....
Good Luck,
Mark.
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