Christophe Leroy <christophe.le...@csgroup.eu> writes: > Booting mpc85xx_defconfig kernel on QEMU leads to:
What machine/CPU model are you using for that? I tried ppce500/e500 and that is working OK for me, ie. boots to userspace and I see math instructions being emulated via the emulated stats. cheers > Bad trap at PC: fe9bab0, SR: 2d000, vector=800 > awk[82]: unhandled trap (5) at 0 nip fe9bab0 lr fe9e01c code 5 in > libc-2.27.so[fe5a000+17a000] > awk[82]: code: 3aa00000 3a800010 4bffe03c 9421fff0 7ca62b78 38a00000 93c10008 > 83c10008 > awk[82]: code: 38210010 4bffdec8 9421ffc0 7c0802a6 <fc00048e> d8010008 > 4815190d 93810030 > Trace/breakpoint trap > WARNING: no useful console > > This is because allthough CONFIG_MATH_EMULATION is selected, > Exception 800 calls unknown_exception(). > > Call emulation_assist_interrupt() instead. > > Signed-off-by: Christophe Leroy <christophe.le...@csgroup.eu> > --- > arch/powerpc/kernel/head_85xx.S | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/powerpc/kernel/head_85xx.S b/arch/powerpc/kernel/head_85xx.S > index 97e9ea0c7297..0f1641a31250 100644 > --- a/arch/powerpc/kernel/head_85xx.S > +++ b/arch/powerpc/kernel/head_85xx.S > @@ -395,7 +395,7 @@ interrupt_base: > #ifdef CONFIG_PPC_FPU > FP_UNAVAILABLE_EXCEPTION > #else > - EXCEPTION(0x0800, FP_UNAVAIL, FloatingPointUnavailable, > unknown_exception) > + EXCEPTION(0x0800, FP_UNAVAIL, FloatingPointUnavailable, > emulation_assist_interrupt) > #endif > > /* System Call Interrupt */ > -- > 2.41.0