On Wed, 23 May 2001, Daniel Jacobowitz wrote: > The ll/sc constructs in the kernel use ".set noat" to inhibit use of $at, > and proceed to use it themselves. This is fine, except for one problem: the > constraints on memory operands are "o" and "=o", which means offsettable > memory references. If I'm not mistaken, the assembler will (always?) > turn these into uses of $at if the offset is not 0 - at least, it certainly > seems to do that here (gcc 2.95.3, binutils 2.10.91.0.2). Just being honest > with the compiler and asking for a real memory reference does the trick. Both "m" and "o" seem to be incorrect here as both are the same for MIPS; "R" seems to be appropriate, OTOH. Still gcc 2.95.3 doesn't handle "R" fine for all cases, but it works most of the time and emits a warning otherwise. I can't comment on 3.0. Note that if noat is in effect and at is to be used, gas should bail out with an error. There is a bug, if it doesn't. -- + Maciej W. Rozycki, Technical University of Gdansk, Poland + +--------------------------------------------------------------+ + e-mail: macro@ds2.pg.gda.pl, PGP key available +
