[Qemu-devel] [PATCH v1 09/17] target-arm: introduce tbflag for endianness

[Peter Crosthwaite <crosthwaitepeter@gmail.com>]

From: Peter Crosthwaite <peter.crosthwaite@xilinx.com>

Introduce a tbflags for endianness, set based upon the CPUs current
endianness. This in turn propagates through to the disas endianness
flag.

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
---

 target-arm/cpu.h           | 7 +++++++
 target-arm/translate-a64.c | 2 +-
 target-arm/translate.c     | 2 +-
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index 54675c7..74048d1 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -1857,6 +1857,8 @@ static bool arm_cpu_is_big_endian(CPUARMState *env)
  */
 #define ARM_TBFLAG_NS_SHIFT         19
 #define ARM_TBFLAG_NS_MASK          (1 << ARM_TBFLAG_NS_SHIFT)
+#define ARM_TBFLAG_MOE_SHIFT        20
+#define ARM_TBFLAG_MOE_MASK         (1 << ARM_TBFLAG_MOE_SHIFT)
 
 /* Bit usage when in AArch64 state: currently we have no A64 specific bits */
 
@@ -1887,6 +1889,8 @@ static bool arm_cpu_is_big_endian(CPUARMState *env)
     (((F) & ARM_TBFLAG_XSCALE_CPAR_MASK) >> ARM_TBFLAG_XSCALE_CPAR_SHIFT)
 #define ARM_TBFLAG_NS(F) \
     (((F) & ARM_TBFLAG_NS_MASK) >> ARM_TBFLAG_NS_SHIFT)
+#define ARM_TBFLAG_MOE(F) \
+    (((F) & ARM_TBFLAG_MOE_MASK) >> ARM_TBFLAG_MOE_SHIFT)
 
 /* Return the exception level to which FP-disabled exceptions should
  * be taken, or 0 if FP is enabled.
@@ -2018,6 +2022,9 @@ static inline void cpu_get_tb_cpu_state(CPUARMState *env, target_ulong *pc,
             }
         }
     }
+    if (arm_cpu_is_big_endian(env)) {
+        *flags |= ARM_TBFLAG_MOE_MASK;
+    }
     *flags |= fp_exception_el(env) << ARM_TBFLAG_FPEXC_EL_SHIFT;
 
     *cs_base = 0;
diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c
index 59026b6..db68662 100644
--- a/target-arm/translate-a64.c
+++ b/target-arm/translate-a64.c
@@ -11044,7 +11044,7 @@ void gen_intermediate_code_a64(ARMCPU *cpu, TranslationBlock *tb)
                                !arm_el_is_aa64(env, 3);
     dc->thumb = 0;
     dc->bswap_code = 0;
-    dc->mo_endianness = MO_TE;
+    dc->mo_endianness = ARM_TBFLAG_MOE(tb->flags) ? MO_BE : MO_LE;
     dc->condexec_mask = 0;
     dc->condexec_cond = 0;
     dc->mmu_idx = ARM_TBFLAG_MMUIDX(tb->flags);
diff --git a/target-arm/translate.c b/target-arm/translate.c
index e1679d3..cb925ef 100644
--- a/target-arm/translate.c
+++ b/target-arm/translate.c
@@ -11274,7 +11274,7 @@ void gen_intermediate_code(CPUARMState *env, TranslationBlock *tb)
                                !arm_el_is_aa64(env, 3);
     dc->thumb = ARM_TBFLAG_THUMB(tb->flags);
     dc->bswap_code = ARM_TBFLAG_BSWAP_CODE(tb->flags);
-    dc->mo_endianness = MO_TE;
+    dc->mo_endianness = ARM_TBFLAG_MOE(tb->flags) ? MO_BE : MO_LE;
     dc->condexec_mask = (ARM_TBFLAG_CONDEXEC(tb->flags) & 0xf) << 1;
     dc->condexec_cond = ARM_TBFLAG_CONDEXEC(tb->flags) >> 4;
     dc->mmu_idx = ARM_TBFLAG_MMUIDX(tb->flags);
-- 
1.9.1