aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorPeter Maydell <peter.maydell@linaro.org>2014-02-26 17:20:06 +0000
committerPeter Maydell <peter.maydell@linaro.org>2014-02-26 17:20:06 +0000
commit9cfa0b4e4c3076683b6c528a1a3b43d5a202a497 (patch)
treeee64227b9a748713fab27c7fc75d2812d4fdad5d
parent4cc35614a056839df8b0675cd16f55e758cd570d (diff)
downloadqemu-arm-9cfa0b4e4c3076683b6c528a1a3b43d5a202a497.tar.gz
target-arm: A64: Implement MSR (immediate) instructions
Implement the MSR (immediate) instructions, which can update the PSTATE SP and DAIF fields. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
-rw-r--r--target-arm/helper.h2
-rw-r--r--target-arm/op_helper.c25
-rw-r--r--target-arm/translate-a64.c25
3 files changed, 51 insertions, 1 deletions
diff --git a/target-arm/helper.h b/target-arm/helper.h
index 19bd620532..4a063c1e40 100644
--- a/target-arm/helper.h
+++ b/target-arm/helper.h
@@ -63,6 +63,8 @@ DEF_HELPER_2(get_cp_reg, i32, env, ptr)
DEF_HELPER_3(set_cp_reg64, void, env, ptr, i64)
DEF_HELPER_2(get_cp_reg64, i64, env, ptr)
+DEF_HELPER_3(msr_i_pstate, void, env, i32, i32)
+
DEF_HELPER_2(get_r13_banked, i32, env, i32)
DEF_HELPER_3(set_r13_banked, void, env, i32, i32)
diff --git a/target-arm/op_helper.c b/target-arm/op_helper.c
index eb0fccd98f..7d06d2f9a5 100644
--- a/target-arm/op_helper.c
+++ b/target-arm/op_helper.c
@@ -319,6 +319,31 @@ uint64_t HELPER(get_cp_reg64)(CPUARMState *env, void *rip)
return ri->readfn(env, ri);
}
+void HELPER(msr_i_pstate)(CPUARMState *env, uint32_t op, uint32_t imm)
+{
+ /* MSR_i to update PSTATE. This is OK from EL0 only if UMA is set.
+ * Note that SPSel is never OK from EL0; we rely on handle_msr_i()
+ * to catch that case at translate time.
+ */
+ if (arm_current_pl(env) == 0 && !(env->cp15.c1_sys & SCTLR_UMA)) {
+ raise_exception(env, EXCP_UDEF);
+ }
+
+ switch (op) {
+ case 0x05: /* SPSel */
+ env->pstate = deposit32(env->pstate, 0, 1, imm);
+ break;
+ case 0x1e: /* DAIFSet */
+ env->daif |= (imm << 6) & PSTATE_DAIF;
+ break;
+ case 0x1f: /* DAIFClear */
+ env->daif &= ~((imm << 6) & PSTATE_DAIF);
+ break;
+ default:
+ g_assert_not_reached();
+ }
+}
+
/* ??? Flag setting arithmetic is awkward because we need to do comparisons.
The only way to do that in TCG is a conditional branch, which clobbers
all our temporaries. For now implement these as helper functions. */
diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c
index 2f47ec5a72..08ac6591b6 100644
--- a/target-arm/translate-a64.c
+++ b/target-arm/translate-a64.c
@@ -1128,7 +1128,30 @@ static void handle_sync(DisasContext *s, uint32_t insn,
static void handle_msr_i(DisasContext *s, uint32_t insn,
unsigned int op1, unsigned int op2, unsigned int crm)
{
- unsupported_encoding(s, insn);
+ int op = op1 << 3 | op2;
+ switch (op) {
+ case 0x05: /* SPSel */
+ if (s->current_pl == 0) {
+ unallocated_encoding(s);
+ return;
+ }
+ /* fall through */
+ case 0x1e: /* DAIFSet */
+ case 0x1f: /* DAIFClear */
+ {
+ TCGv_i32 tcg_imm = tcg_const_i32(crm);
+ TCGv_i32 tcg_op = tcg_const_i32(op);
+ gen_a64_set_pc_im(s->pc - 4);
+ gen_helper_msr_i_pstate(cpu_env, tcg_op, tcg_imm);
+ tcg_temp_free_i32(tcg_imm);
+ tcg_temp_free_i32(tcg_op);
+ s->is_jmp = DISAS_UPDATE;
+ break;
+ }
+ default:
+ unallocated_encoding(s);
+ return;
+ }
}
static void gen_get_nzcv(TCGv_i64 tcg_rt)