Hello.
Ralf Baechle wrote:
Workaround: mask EXL bit of the result or place a nop before mfc0.
[...]
@@ -55,8 +56,13 @@ __asm__ (
" di \n"
#else
" mfc0 $1,$12 \n"
+#if TX49XX_MFC0_WAR && defined(MODULE)
+ " ori $1,3 \n"
+ " xori $1,3 \n"
+#else
" ori $1,1 \n"
" xori $1,1 \n"
+#endif
" .set noreorder \n"
" mtc0 $1,$12 \n"
#endif
Hmm, wouldn't that "nop" alternative be simpler?
Simpler maybe - but this variant has zero runtime overhead.
And.. how do you imagine placing a NOP (which surely just moves MFC0 down
so that it's a 1st insn. on the next page). What if it'll move it to the
errata prone address from a safe one instead?
WBR, Sergei
