From 923976dfe367b0bfed45ff660c369f3fe65604a7 Mon Sep 17 00:00:00 2001 From: Helge Deller Date: Sat, 17 May 2025 13:12:07 +0200 Subject: [PATCH] target/hppa: Copy instruction code into fr1 on FPU assist fault The hardware stores the instruction code in the lower bits of the FP exception register #1 on FP assist traps. This fixes the FP exception handler on Linux, as the Linux kernel uses the value to decide on the correct signal which should be pushed into userspace (see decode_fpu() in Linux kernel). Signed-off-by: Helge Deller --- target/hppa/int_helper.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/target/hppa/int_helper.c b/target/hppa/int_helper.c index 7d48643bb6..191ae19404 100644 --- a/target/hppa/int_helper.c +++ b/target/hppa/int_helper.c @@ -177,6 +177,10 @@ void hppa_cpu_do_interrupt(CPUState *cs) } } env->cr[CR_IIR] = ldl_phys(cs->as, paddr); + if (i == EXCP_ASSIST) { + /* stuff insn code into bits of FP exception register #1 */ + env->fr[0] |= (env->cr[CR_IIR] & 0x03ffffff); + } } break; -- 2.39.5