tcg_gen_andi_i32(cpu_msr, v, ~(MSR_C | MSR_CC | MSR_PVR));
}
+static bool do_msrclrset(DisasContext *dc, arg_type_msr *arg, bool set)
+{
+ uint32_t imm = arg->imm;
+
+ if (trap_userspace(dc, imm != MSR_C)) {
+ return true;
+ }
+
+ if (arg->rd) {
+ msr_read(dc, cpu_R[arg->rd]);
+ }
+
+ /*
+ * Handle the carry bit separately.
+ * This is the only bit that userspace can modify.
+ */
+ if (imm & MSR_C) {
+ tcg_gen_movi_i32(cpu_msr_c, set);
+ }
+
+ /*
+ * MSR_C and MSR_CC set above.
+ * MSR_PVR is not writable, and is always clear.
+ */
+ imm &= ~(MSR_C | MSR_CC | MSR_PVR);
+
+ if (imm != 0) {
+ if (set) {
+ tcg_gen_ori_i32(cpu_msr, cpu_msr, imm);
+ } else {
+ tcg_gen_andi_i32(cpu_msr, cpu_msr, ~imm);
+ }
+ dc->cpustate_changed = 1;
+ }
+ return true;
+}
+
+static bool trans_msrclr(DisasContext *dc, arg_type_msr *arg)
+{
+ return do_msrclrset(dc, arg, false);
+}
+
+static bool trans_msrset(DisasContext *dc, arg_type_msr *arg)
+{
+ return do_msrclrset(dc, arg, true);
+}
+
static void dec_msr(DisasContext *dc)
{
CPUState *cs = CPU(dc->cpu);
- TCGv_i32 t0, t1;
unsigned int sr, rn;
- bool to, clrset, extended = false;
+ bool to, extended = false;
sr = extract32(dc->imm, 0, 14);
to = extract32(dc->imm, 14, 1);
- clrset = extract32(dc->imm, 15, 1) == 0;
dc->type_b = 1;
if (to) {
dc->cpustate_changed = 1;
extended = extract32(dc->imm, e_bit[to], 1);
}
- /* msrclr and msrset. */
- if (clrset) {
- bool clr = extract32(dc->ir, 16, 1);
-
- if (!dc->cpu->cfg.use_msr_instr) {
- /* nop??? */
- return;
- }
-
- if (trap_userspace(dc, dc->imm != 4 && dc->imm != 0)) {
- return;
- }
-
- if (dc->rd)
- msr_read(dc, cpu_R[dc->rd]);
-
- t0 = tcg_temp_new_i32();
- t1 = tcg_temp_new_i32();
- msr_read(dc, t0);
- tcg_gen_mov_i32(t1, *(dec_alu_op_b(dc)));
-
- if (clr) {
- tcg_gen_not_i32(t1, t1);
- tcg_gen_and_i32(t0, t0, t1);
- } else
- tcg_gen_or_i32(t0, t0, t1);
- msr_write(dc, t0);
- tcg_temp_free_i32(t0);
- tcg_temp_free_i32(t1);
- tcg_gen_movi_i32(cpu_pc, dc->base.pc_next + 4);
- dc->base.is_jmp = DISAS_UPDATE;
- return;
- }
-
if (trap_userspace(dc, to)) {
return;
}