diff options
Diffstat (limited to 'target/m68k/op_helper.c')
| -rw-r--r-- | target/m68k/op_helper.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/target/m68k/op_helper.c b/target/m68k/op_helper.c index 9b0698f267..ae1ba4b437 100644 --- a/target/m68k/op_helper.c +++ b/target/m68k/op_helper.c @@ -348,7 +348,10 @@ static void m68k_interrupt_all(CPUM68KState *env, int is_hw) cpu_m68k_set_sr(env, sr); sp = env->aregs[7]; - sp &= ~1; + if (!m68k_feature(env, M68K_FEATURE_UNALIGNED_DATA)) { + sp &= ~1; + } + if (cs->exception_index == EXCP_ACCESS) { if (env->mmu.fault) { cpu_abort(cs, "DOUBLE MMU FAULT\n"); @@ -468,7 +471,17 @@ void m68k_cpu_transaction_failed(CPUState *cs, hwaddr physaddr, vaddr addr, if (m68k_feature(env, M68K_FEATURE_M68040)) { env->mmu.mmusr = 0; - env->mmu.ssw |= M68K_ATC_040; + + /* + * According to the MC68040 users manual the ATC bit of the SSW is + * used to distinguish between ATC faults and physical bus errors. + * In the case of a bus error e.g. during nubus read from an empty + * slot this bit should not be set + */ + if (response != MEMTX_DECODE_ERROR) { + env->mmu.ssw |= M68K_ATC_040; + } + /* FIXME: manage MMU table access error */ env->mmu.ssw &= ~M68K_TM_040; if (env->sr & SR_S) { /* SUPERVISOR */ |