target/arm: Enforce alignment for aa64 load-acq/store-rel

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210419202257.161730-28-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

target/arm/translate-a64.c

@@ -2699,7 +2699,8 @@ static void disas_ldst_excl(DisasContext *s, uint32_t insn)
         tcg_gen_mb(TCG_MO_ALL | TCG_BAR_STRL);
         clean_addr = gen_mte_check1(s, cpu_reg_sp(s, rn),
                                     true, rn != 31, size);
-        do_gpr_st(s, cpu_reg(s, rt), clean_addr, size, true, rt,
+        /* TODO: ARMv8.4-LSE SCTLR.nAA */
+        do_gpr_st(s, cpu_reg(s, rt), clean_addr, size | MO_ALIGN, true, rt,
                   disas_ldst_compute_iss_sf(size, false, 0), is_lasr);
         return;
 
@@ -2716,8 +2717,9 @@ static void disas_ldst_excl(DisasContext *s, uint32_t insn)
         }
         clean_addr = gen_mte_check1(s, cpu_reg_sp(s, rn),
                                     false, rn != 31, size);
-        do_gpr_ld(s, cpu_reg(s, rt), clean_addr, size, false, true, rt,
-                  disas_ldst_compute_iss_sf(size, false, 0), is_lasr);
+        /* TODO: ARMv8.4-LSE SCTLR.nAA */
+        do_gpr_ld(s, cpu_reg(s, rt), clean_addr, size | MO_ALIGN, false, true,
+                  rt, disas_ldst_compute_iss_sf(size, false, 0), is_lasr);
         tcg_gen_mb(TCG_MO_ALL | TCG_BAR_LDAQ);
         return;
 
@@ -3505,15 +3507,18 @@ static void disas_ldst_ldapr_stlr(DisasContext *s, uint32_t insn)
     int size = extract32(insn, 30, 2);
     TCGv_i64 clean_addr, dirty_addr;
     bool is_store = false;
-    bool is_signed = false;
     bool extend = false;
     bool iss_sf;
+    MemOp mop;
 
     if (!dc_isar_feature(aa64_rcpc_8_4, s)) {
         unallocated_encoding(s);
         return;
     }
 
+    /* TODO: ARMv8.4-LSE SCTLR.nAA */
+    mop = size | MO_ALIGN;
+
     switch (opc) {
     case 0: /* STLURB */
         is_store = true;
@@ -3525,21 +3530,21 @@ static void disas_ldst_ldapr_stlr(DisasContext *s, uint32_t insn)
             unallocated_encoding(s);
             return;
         }
-        is_signed = true;
+        mop |= MO_SIGN;
         break;
     case 3: /* LDAPURS* 32-bit variant */
         if (size > 1) {
             unallocated_encoding(s);
             return;
         }
-        is_signed = true;
+        mop |= MO_SIGN;
         extend = true; /* zero-extend 32->64 after signed load */
         break;
     default:
         g_assert_not_reached();
     }
 
-    iss_sf = disas_ldst_compute_iss_sf(size, is_signed, opc);
+    iss_sf = disas_ldst_compute_iss_sf(size, (mop & MO_SIGN) != 0, opc);
 
     if (rn == 31) {
         gen_check_sp_alignment(s);
@@ -3552,13 +3557,13 @@ static void disas_ldst_ldapr_stlr(DisasContext *s, uint32_t insn)
     if (is_store) {
         /* Store-Release semantics */
         tcg_gen_mb(TCG_MO_ALL | TCG_BAR_STRL);
-        do_gpr_st(s, cpu_reg(s, rt), clean_addr, size, true, rt, iss_sf, true);
+        do_gpr_st(s, cpu_reg(s, rt), clean_addr, mop, true, rt, iss_sf, true);
     } else {
         /*
          * Load-AcquirePC semantics; we implement as the slightly more
          * restrictive Load-Acquire.
          */
-        do_gpr_ld(s, cpu_reg(s, rt), clean_addr, size + is_signed * MO_SIGN,
+        do_gpr_ld(s, cpu_reg(s, rt), clean_addr, mop,
                   extend, true, rt, iss_sf, true);
         tcg_gen_mb(TCG_MO_ALL | TCG_BAR_LDAQ);
     }