diff options
| -rw-r--r-- | m68k_core_x86.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/m68k_core_x86.c b/m68k_core_x86.c index 84d70cb..a214b79 100644 --- a/m68k_core_x86.c +++ b/m68k_core_x86.c @@ -1759,6 +1759,8 @@ void translate_m68k_divu(m68k_options *opts, m68kinst *inst, host_ea *src_op, ho isize = 6; break; } + //zero seems to clear all flags + update_flags(opts, N0|Z0|V0); mov_ir(code, VECTOR_INT_DIV_ZERO, opts->gen.scratch2, SZ_D); mov_ir(code, inst->address+isize, opts->gen.scratch1, SZ_D); jmp(code, opts->trap); @@ -1768,11 +1770,8 @@ void translate_m68k_divu(m68k_options *opts, m68kinst *inst, host_ea *src_op, ho code_ptr not_overflow = code->cur+1; jcc(code, CC_C, not_overflow); - //flags N and Z flags are set based on internal subtraction of src from top 16-bits of dst - and_ir(code, 0xFFFF0000, opts->gen.scratch2, SZ_D); - cmp_rr(code, opts->gen.scratch1, opts->gen.scratch2, SZ_D); - //TODO: verify N and Z flags are set like I think they are, microcode was a bit confusing - update_flags(opts, N|Z|V1); + //overflow seems to always set the N and clear Z + update_flags(opts, N1|Z0|V1); cycles(&opts->gen, 10); code_ptr end = code->cur+1; jmp(code, end); @@ -1793,7 +1792,7 @@ void translate_m68k_divu(m68k_options *opts, m68kinst *inst, host_ea *src_op, ho if (dst_op->mode == MODE_REG_DIRECT) { mov_rr(code, opts->gen.scratch1, dst_op->base, SZ_D); } else { - mov_rrdisp(code, RAX, dst_op->base, dst_op->disp, SZ_D); + mov_rrdisp(code, opts->gen.scratch1, dst_op->base, dst_op->disp, SZ_D); } *end = code->cur - (end + 1); |