commit ae8c6de01417023e78763de145b1c0e6ddd87277
Author: Carl Love <cel@us.ibm.com>
Date:   Wed Oct 20 20:40:13 2021 +0000

    Fix for the prefixed stq instruction in PC relative mode.
    
    The pstq instruction for R=1, was not using the correct effective address.
    The EA_hi and EA_lo should have been based on the value of EA as calculated
    by the function calculate_prefix_EA.  Unfortuanely, the EA_hi and EA_lo
    addresses were still using the previous code (not PC relative) to calculate
    the address from the contants of RA plus the offset.

diff --git a/VEX/priv/guest_ppc_toIR.c b/VEX/priv/guest_ppc_toIR.c
index 8afd77490..543fa9574 100644
--- a/VEX/priv/guest_ppc_toIR.c
+++ b/VEX/priv/guest_ppc_toIR.c
@@ -9838,23 +9838,24 @@ static Bool dis_int_store_ds_prefix ( UInt prefix,
             if (host_endness == VexEndnessBE) {
 
                /* upper 64-bits */
-               assign( EA_hi, ea_rAor0_simm( rA_addr, immediate_val ) );
+               assign( EA_hi, mkexpr(EA));
 
                /* lower 64-bits */
-               assign( EA_lo, ea_rAor0_simm( rA_addr, immediate_val+8 ) );
+               assign( EA_lo, binop(Iop_Add64, mkexpr(EA), mkU64(8)));
+
             } else {
                /* upper 64-bits */
-               assign( EA_hi, ea_rAor0_simm( rA_addr, immediate_val+8 ) );
+               assign( EA_hi, binop(Iop_Add64, mkexpr(EA), mkU64(8)));
 
                /* lower 64-bits */
-               assign( EA_lo, ea_rAor0_simm( rA_addr, immediate_val ) );
+               assign( EA_lo, mkexpr(EA));
             }
          } else {
             /* upper half of upper 64-bits */
-            assign( EA_hi, ea_rAor0_simm( rA_addr, immediate_val+4 ) );
+            assign( EA_hi, binop(Iop_Add32, mkexpr(EA), mkU32(4)));
 
             /* lower half of upper 64-bits */
-            assign( EA_lo, ea_rAor0_simm( rA_addr, immediate_val+12 ) );
+            assign( EA_lo, binop(Iop_Add32, mkexpr(EA), mkU32(12)));
          }
 
          /* Note, the store order for stq instruction is the same for BE