[Qemu-devel] [PULL 23/30] target-arm: implement setend

[Peter Maydell <peter.maydell@linaro.org>]

From: 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>
Signed-off-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target-arm/helper.h    |  1 +
 target-arm/op_helper.c |  5 +++++
 target-arm/translate.c | 14 ++++++--------
 3 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/target-arm/helper.h b/target-arm/helper.h
index ea13202..e3d09d9 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_4(exception_with_syndrome, void, env, i32, i32, i32)
+DEF_HELPER_1(setend, void, env)
 DEF_HELPER_1(wfi, void, env)
 DEF_HELPER_1(wfe, void, env)
 DEF_HELPER_1(yield, void, env)
diff --git a/target-arm/op_helper.c b/target-arm/op_helper.c
index 4881e34..92fde0a 100644
--- a/target-arm/op_helper.c
+++ b/target-arm/op_helper.c
@@ -296,6 +296,11 @@ uint32_t HELPER(usat16)(CPUARMState *env, uint32_t x, uint32_t shift)
     return res;
 }
 
+void HELPER(setend)(CPUARMState *env)
+{
+    env->uncached_cpsr ^= CPSR_E;
+}
+
 /* Function checks whether WFx (WFI/WFE) instructions are set up to be trapped.
  * The function returns the target EL (1-3) if the instruction is to be trapped;
  * otherwise it returns 0 indicating it is not trapped.
diff --git a/target-arm/translate.c b/target-arm/translate.c
index c430fec..c23ddb3 100644
--- a/target-arm/translate.c
+++ b/target-arm/translate.c
@@ -7786,10 +7786,9 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn)
         if ((insn & 0x0ffffdff) == 0x01010000) {
             ARCH(6);
             /* setend */
-            if (((insn >> 9) & 1) != bswap_code(s->sctlr_b)) {
-                /* Dynamic endianness switching not implemented. */
-                qemu_log_mask(LOG_UNIMP, "arm: unimplemented setend\n");
-                goto illegal_op;
+            if (((insn >> 9) & 1) != !!(s->be_data == MO_BE)) {
+                gen_helper_setend(cpu_env);
+                s->is_jmp = DISAS_UPDATE;
             }
             return;
         } else if ((insn & 0x0fffff00) == 0x057ff000) {
@@ -11121,10 +11120,9 @@ static void disas_thumb_insn(CPUARMState *env, DisasContext *s)
             case 2:
                 /* setend */
                 ARCH(6);
-                if (((insn >> 3) & 1) != bswap_code(s->sctlr_b)) {
-                    /* Dynamic endianness switching not implemented. */
-                    qemu_log_mask(LOG_UNIMP, "arm: unimplemented setend\n");
-                    goto illegal_op;
+                if (((insn >> 3) & 1) != !!(s->be_data == MO_BE)) {
+                    gen_helper_setend(cpu_env);
+                    s->is_jmp = DISAS_UPDATE;
                 }
                 break;
             case 3:
-- 
1.9.1