commit 6e08ee95f7f1b1c3fd434fa380cc5b2cc3e3f7c7

Author: Carl Love <cel@us.ibm.com>

Date:   Fri Oct 29 16:30:33 2021 -0500

    Bug 444571 - PPC, fix the lxsibzx and lxsihzx so they only load their respective sized data.

    The lxsibzx was doing a 64-bit load.  The result was initializing

    additional bytes in the register that should not have been initialized.

    The memcheck/tests/linux/dlclose_leak test detected the issue.  The

    code generation uses lxsibzx and stxsibx with -mcpu=power9.  Previously

    the lbz and stb instructions were generated.

    The same issue was noted and fixed with the lxsihzx instruction.  The

    memcheck/tests/linux/badrw test now passes as well.

    https://bugs.kde.org/show_bug.cgi?id=444571

diff --git a/VEX/priv/guest_ppc_toIR.c b/VEX/priv/guest_ppc_toIR.c

index d90d566ed..8afd77490 100644

--- a/VEX/priv/guest_ppc_toIR.c

+++ b/VEX/priv/guest_ppc_toIR.c

@@ -25359,19 +25359,17 @@ dis_vx_load ( UInt prefix, UInt theInstr )

       else

          irx_addr = mkexpr( EA );

-

-      byte = load( Ity_I64, irx_addr );

+      /* byte load */

+      byte = load( Ity_I8, irx_addr );

       putVSReg( XT, binop( Iop_64HLtoV128,

-                            binop( Iop_And64,

-                                   byte,

-                                   mkU64( 0xFF ) ),

+                           unop( Iop_8Uto64, byte ),

                            mkU64( 0 ) ) );

       break;

    }

    case 0x32D: // lxsihzx

    {

-      IRExpr *byte;

+      IRExpr *hword;

       IRExpr* irx_addr;

       DIP("lxsihzx %u,r%u,r%u\n", (UInt)XT, rA_addr, rB_addr);

@@ -25382,11 +25380,10 @@ dis_vx_load ( UInt prefix, UInt theInstr )

       else

          irx_addr = mkexpr( EA );

-      byte = load( Ity_I64, irx_addr );

+      hword = load( Ity_I16, irx_addr );

       putVSReg( XT, binop( Iop_64HLtoV128,

-                            binop( Iop_And64,

-                                   byte,

-                                   mkU64( 0xFFFF ) ),

+                            unop( Iop_16Uto64,

+                                  hword ),

                            mkU64( 0 ) ) );

       break;

    }