Le 10/10/2023 à 12:45, Michael Ellerman a écrit : > Christophe Leroy <christophe.le...@csgroup.eu> writes: >> Booting mpc85xx_defconfig kernel on QEMU leads to: > > What machine/CPU model are you using for that?
If I remember correctly, it was machine mpc8544ds. Christophe > > 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