target/arm: Check HAVE_CMPXCHG128 at translate time

Reviewed-by: NEmilio G. Cota <cota@braap.org>
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

target/arm/helper-a64.c

@@ -563,9 +563,7 @@ uint64_t HELPER(paired_cmpxchg64_le_parallel)(CPUARMState *env, uint64_t addr,
     int mem_idx;
     TCGMemOpIdx oi;
 
-    if (!HAVE_CMPXCHG128) {
-        cpu_loop_exit_atomic(ENV_GET_CPU(env), ra);
-    }
+    assert(HAVE_CMPXCHG128);
 
     mem_idx = cpu_mmu_index(env, false);
     oi = make_memop_idx(MO_LEQ | MO_ALIGN_16, mem_idx);
@@ -635,9 +633,7 @@ uint64_t HELPER(paired_cmpxchg64_be_parallel)(CPUARMState *env, uint64_t addr,
     int mem_idx;
     TCGMemOpIdx oi;
 
-    if (!HAVE_CMPXCHG128) {
-        cpu_loop_exit_atomic(ENV_GET_CPU(env), ra);
-    }
+    assert(HAVE_CMPXCHG128);
 
     mem_idx = cpu_mmu_index(env, false);
     oi = make_memop_idx(MO_BEQ | MO_ALIGN_16, mem_idx);
@@ -663,9 +659,7 @@ void HELPER(casp_le_parallel)(CPUARMState *env, uint32_t rs, uint64_t addr,
     int mem_idx;
     TCGMemOpIdx oi;
 
-    if (!HAVE_CMPXCHG128) {
-        cpu_loop_exit_atomic(ENV_GET_CPU(env), ra);
-    }
+    assert(HAVE_CMPXCHG128);
 
     mem_idx = cpu_mmu_index(env, false);
     oi = make_memop_idx(MO_LEQ | MO_ALIGN_16, mem_idx);
@@ -686,9 +680,7 @@ void HELPER(casp_be_parallel)(CPUARMState *env, uint32_t rs, uint64_t addr,
     int mem_idx;
     TCGMemOpIdx oi;
 
-    if (!HAVE_CMPXCHG128) {
-        cpu_loop_exit_atomic(ENV_GET_CPU(env), ra);
-    }
+    assert(HAVE_CMPXCHG128);
 
     mem_idx = cpu_mmu_index(env, false);
     oi = make_memop_idx(MO_LEQ | MO_ALIGN_16, mem_idx);

target/arm/translate-a64.c

@@ -37,6 +37,7 @@
 
 #include "trace-tcg.h"
 #include "translate-a64.h"
+#include "qemu/atomic128.h"
 
 static TCGv_i64 cpu_X[32];
 static TCGv_i64 cpu_pc;
@@ -2086,27 +2087,28 @@ static void gen_store_exclusive(DisasContext *s, int rd, int rt, int rt2,
                                        get_mem_index(s),
                                        MO_64 | MO_ALIGN | s->be_data);
             tcg_gen_setcond_i64(TCG_COND_NE, tmp, tmp, cpu_exclusive_val);
+        } else if (tb_cflags(s->base.tb) & CF_PARALLEL) {
+            if (!HAVE_CMPXCHG128) {
+                gen_helper_exit_atomic(cpu_env);
+                s->base.is_jmp = DISAS_NORETURN;
             } else if (s->be_data == MO_LE) {
-            if (tb_cflags(s->base.tb) & CF_PARALLEL) {
                 gen_helper_paired_cmpxchg64_le_parallel(tmp, cpu_env,
                                                         cpu_exclusive_addr,
                                                         cpu_reg(s, rt),
                                                         cpu_reg(s, rt2));
             } else {
-                gen_helper_paired_cmpxchg64_le(tmp, cpu_env, cpu_exclusive_addr,
-                                               cpu_reg(s, rt), cpu_reg(s, rt2));
-            }
-        } else {
-            if (tb_cflags(s->base.tb) & CF_PARALLEL) {
                 gen_helper_paired_cmpxchg64_be_parallel(tmp, cpu_env,
                                                         cpu_exclusive_addr,
                                                         cpu_reg(s, rt),
                                                         cpu_reg(s, rt2));
+            }
+        } else if (s->be_data == MO_LE) {
+            gen_helper_paired_cmpxchg64_le(tmp, cpu_env, cpu_exclusive_addr,
+                                           cpu_reg(s, rt), cpu_reg(s, rt2));
         } else {
             gen_helper_paired_cmpxchg64_be(tmp, cpu_env, cpu_exclusive_addr,
                                            cpu_reg(s, rt), cpu_reg(s, rt2));
         }
-        }
     } else {
         tcg_gen_atomic_cmpxchg_i64(tmp, cpu_exclusive_addr, cpu_exclusive_val,
                                    cpu_reg(s, rt), get_mem_index(s),
@@ -2175,14 +2177,18 @@ static void gen_compare_and_swap_pair(DisasContext *s, int rs, int rt,
         }
         tcg_temp_free_i64(cmp);
     } else if (tb_cflags(s->base.tb) & CF_PARALLEL) {
+        if (HAVE_CMPXCHG128) {
             TCGv_i32 tcg_rs = tcg_const_i32(rs);
-
             if (s->be_data == MO_LE) {
                 gen_helper_casp_le_parallel(cpu_env, tcg_rs, addr, t1, t2);
             } else {
                 gen_helper_casp_be_parallel(cpu_env, tcg_rs, addr, t1, t2);
             }
             tcg_temp_free_i32(tcg_rs);
+        } else {
+            gen_helper_exit_atomic(cpu_env);
+            s->base.is_jmp = DISAS_NORETURN;
+        }
     } else {
         TCGv_i64 d1 = tcg_temp_new_i64();
         TCGv_i64 d2 = tcg_temp_new_i64();