[Qemu-devel] [PATCH v3 09/11] target-arm: implement setend

[Paolo Bonzini <pbonzini@redhat.com>]

Since this is not a high-performance path, just use a helper to
flip the E bit and force a lookup in the hash table since the
flags have changed.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 target-arm/helper.h    |  1 +
 target-arm/op_helper.c |  5 +++++
 target-arm/translate.c | 12 ++++++------
 3 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/target-arm/helper.h b/target-arm/helper.h
index facfcd2..c7e3949 100644
--- a/target-arm/helper.h
+++ b/target-arm/helper.h
@@ -48,6 +48,7 @@ DEF_HELPER_FLAGS_3(sel_flags, TCG_CALL_NO_RWG_SE,
                    i32, i32, i32, i32)
 DEF_HELPER_2(exception_internal, void, env, i32)
 DEF_HELPER_3(exception_with_syndrome, void, env, i32, i32)
+DEF_HELPER_1(setend, void, env)
 DEF_HELPER_1(wfi, void, env)
 DEF_HELPER_1(wfe, void, env)
 
diff --git a/target-arm/op_helper.c b/target-arm/op_helper.c
index 9c1ef52..30eea14 100644
--- a/target-arm/op_helper.c
+++ b/target-arm/op_helper.c
@@ -209,6 +209,11 @@ uint32_t HELPER(usat16)(CPUARMState *env, uint32_t x, uint32_t shift)
     return res;
 }
 
+void HELPER(setend)(CPUARMState *env)
+{
+    env->uncached_cpsr ^= CPSR_E;
+}
+
 void HELPER(wfi)(CPUARMState *env)
 {
     CPUState *cs = CPU(arm_env_get_cpu(env));
diff --git a/target-arm/translate.c b/target-arm/translate.c
index 8be8f21..30e3586 100644
--- a/target-arm/translate.c
+++ b/target-arm/translate.c
@@ -7561,9 +7561,9 @@ static void disas_arm_insn(CPUARMState * env, DisasContext *s)
             ARCH(6);
             /* setend */
             if (((insn >> 9) & 1) != s->cpsr_e) {
-                /* Dynamic endianness switching not implemented. */
-                qemu_log_mask(LOG_UNIMP, "arm: unimplemented setend\n");
-                goto illegal_op;
+                gen_helper_setend(cpu_env);
+                gen_set_pc_im(s, s->pc);
+                s->is_jmp = DISAS_JUMP;
             }
             return;
         } else if ((insn & 0x0fffff00) == 0x057ff000) {
@@ -10728,9 +10728,9 @@ static void disas_thumb_insn(CPUARMState *env, DisasContext *s)
                 /* setend */
                 ARCH(6);
                 if (((insn >> 3) & 1) != s->cpsr_e) {
-                    /* Dynamic endianness switching not implemented. */
-                    qemu_log_mask(LOG_UNIMP, "arm: unimplemented setend\n");
-                    goto illegal_op;
+                    gen_helper_setend(cpu_env);
+                    gen_set_pc_im(s, s->pc);
+                    s->is_jmp = DISAS_JUMP;
                 }
                 break;
             case 3:
-- 
1.9.3