[Qemu-devel] [PATCH 11/14] tcg-sparc: Mask shift immediates to avoid illegal insns.

[Richard Henderson]

The xtensa-test image generates a sra_i32 with count 0x40.
Whether this is accident of tcg constant propagation or
originating directly from the instruction stream is immaterial.

Signed-off-by: Richard Henderson <address@hidden>
---
 tcg/sparc/tcg-target.c |   18 ++++++++++++------
 1 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/tcg/sparc/tcg-target.c b/tcg/sparc/tcg-target.c
index 88c5140..5b3cde4 100644
--- a/tcg/sparc/tcg-target.c
+++ b/tcg/sparc/tcg-target.c
@@ -1184,13 +1184,16 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode 
opc, const TCGArg *args,
         goto gen_arith;
     case INDEX_op_shl_i32:
         c = SHIFT_SLL;
-        goto gen_arith;
+    do_shift32:
+        /* Limit immediate shift count lest we create an illegal insn.  */
+        tcg_out_arithc(s, args[0], args[1], args[2] & 31, const_args[2], c);
+        break;
     case INDEX_op_shr_i32:
         c = SHIFT_SRL;
-        goto gen_arith;
+        goto do_shift32;
     case INDEX_op_sar_i32:
         c = SHIFT_SRA;
-        goto gen_arith;
+        goto do_shift32;
     case INDEX_op_mul_i32:
         c = ARITH_UMUL;
         goto gen_arith;
@@ -1311,13 +1314,16 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode 
opc, const TCGArg *args,
         break;
     case INDEX_op_shl_i64:
         c = SHIFT_SLLX;
-        goto gen_arith;
+    do_shift64:
+        /* Limit immediate shift count lest we create an illegal insn.  */
+        tcg_out_arithc(s, args[0], args[1], args[2] & 63, const_args[2], c);
+        break;
     case INDEX_op_shr_i64:
         c = SHIFT_SRLX;
-        goto gen_arith;
+        goto do_shift64;
     case INDEX_op_sar_i64:
         c = SHIFT_SRAX;
-        goto gen_arith;
+        goto do_shift64;
     case INDEX_op_mul_i64:
         c = ARITH_MULX;
         goto gen_arith;
-- 
1.7.7.6