[Qemu-devel] [PATCH v2 12/18] 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>
---
changed since v1:
s/MOE/BE_DATA (PMM review)

 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 cbf171c..279c91f 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -1985,6 +1985,8 @@ static inline bool arm_cpu_data_is_big_endian(CPUARMState *env)
  */
 #define ARM_TBFLAG_NS_SHIFT         19
 #define ARM_TBFLAG_NS_MASK          (1 << ARM_TBFLAG_NS_SHIFT)
+#define ARM_TBFLAG_BE_DATA_SHIFT    20
+#define ARM_TBFLAG_BE_DATA_MASK     (1 << ARM_TBFLAG_BE_DATA_SHIFT)
 
 /* Bit usage when in AArch64 state: currently we have no A64 specific bits */
 
@@ -2015,6 +2017,8 @@ static inline bool arm_cpu_data_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_BE_DATA(F) \
+    (((F) & ARM_TBFLAG_BE_DATA_MASK) >> ARM_TBFLAG_BE_DATA_SHIFT)
 
 static inline bool bswap_code(bool sctlr_b)
 {
@@ -2157,6 +2161,9 @@ static inline void cpu_get_tb_cpu_state(CPUARMState *env, target_ulong *pc,
             }
         }
     }
+    if (arm_cpu_data_is_big_endian(env)) {
+        *flags |= ARM_TBFLAG_BE_DATA_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 539e6d9..f0c73df 100644
--- a/target-arm/translate-a64.c
+++ b/target-arm/translate-a64.c
@@ -11043,7 +11043,7 @@ void gen_intermediate_code_a64(ARMCPU *cpu, TranslationBlock *tb)
                                !arm_el_is_aa64(env, 3);
     dc->thumb = 0;
     dc->sctlr_b = 0;
-    dc->be_data = MO_TE;
+    dc->be_data = ARM_TBFLAG_BE_DATA(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 88f24cb..fe0be00 100644
--- a/target-arm/translate.c
+++ b/target-arm/translate.c
@@ -11330,7 +11330,7 @@ void gen_intermediate_code(CPUARMState *env, TranslationBlock *tb)
                                !arm_el_is_aa64(env, 3);
     dc->thumb = ARM_TBFLAG_THUMB(tb->flags);
     dc->sctlr_b = ARM_TBFLAG_SCTLR_B(tb->flags);
-    dc->be_data = MO_TE;
+    dc->be_data = ARM_TBFLAG_BE_DATA(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