[v9,19/24] target/arm: Rebuild hflags at Xscale SCTLR writes
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Message ID 20191023150057.25731-20-richard.henderson@linaro.org
State New
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Series
  • target/arm: Reduce overhead of cpu_get_tb_cpu_state
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Commit Message

Richard Henderson Oct. 23, 2019, 3 p.m. UTC
Continue setting, but not relying upon, env->hflags.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/arm/helper.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

Patch
diff mbox series

diff --git a/target/arm/helper.c b/target/arm/helper.c
index aae7b62458..c55783e540 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -4174,6 +4174,16 @@  static void sctlr_write(CPUARMState *env, const ARMCPRegInfo *ri,
     /* ??? Lots of these bits are not implemented.  */
     /* This may enable/disable the MMU, so do a TLB flush.  */
     tlb_flush(CPU(cpu));
+
+    if (ri->type & ARM_CP_SUPPRESS_TB_END) {
+        /*
+         * Normally we would always end the TB on an SCTLR write; see the
+         * comment in ARMCPRegInfo sctlr initialization below for why Xscale
+         * is special.  Setting ARM_CP_SUPPRESS_TB_END also stops the rebuild
+         * of hflags from the translator, so do it here.
+         */
+        arm_rebuild_hflags(env);
+    }
 }
 
 static CPAccessResult fpexc32_access(CPUARMState *env, const ARMCPRegInfo *ri,