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From: Sebastien C. <seb...@ya...> - 2010-04-17 14:49:49
|
Hi Julien, Thank you for your answer. It seems that only adding the support for "sz == 8" doesn't work. If I remove the "haveREX(pfx)" from my change then it fails. For the PMOVMSKB instruction, I changed the code to return success if the "epartIsReg(modrm)" check fails. I'm pretty sure this change broke something but now I can run my application inside valgrind with memcheck and memory leaks are detected correctly. I attached the diff for my changes to the bug ( http://bugs.kde.org/show_bug.cgi?id=233638 ). If you have suggestions for a correct fix, I'm willing to try them. Sebastien --- On Fri, 4/16/10, Julian Seward <js...@ac...> wrote: > From: Julian Seward <js...@ac...> > Subject: Re: [Valgrind-developers] Unhandled instruction on x86-64 > To: val...@li... > Cc: "Sebastien Cote" <seb...@ya...> > Received: Friday, April 16, 2010, 4:48 PM > On Thursday 15 April 2010, Sebastien > Cote wrote: > > Hi, > > > > It seems the instructions were already handled in VEX > but not with the REX > > prefix. I tried changing the code to work around it > like the following: > > > > /* 66 0F FC = PADDB */ > > - if (have66noF2noF3(pfx) && > sz == 2 > > + if ((have66noF2noF3(pfx) || > haveREX(pfx)) > > + && (sz == 2 > || /* ignore redundant REX.W */ sz == 8) > > && > insn[0] == 0x0F && insn[1] == 0xFC) { > > delta = dis_SSEint_E_to_G( > vbi, pfx, delta+2, > > > > "paddb", Iop_Add8x16, False ); > > > > > > I may have broken something with this change but it > got rid of the previous > > unhandled instructions. However, now I get an > unhandled instruction on: > > That's nearly right. In fact the "haveREX(pfx)" is > redundant, so in fact > the only change is from > > sz == 2 > > to > > (sz == 2 || /* ignore redundant REX.W */ > sz == 8) > > > > 66 48 0f d7 c0 > pmovmskb %xmm0,%rax > > > > Now I really don't know how to work around this > because the handling of the > > pmovmskb instruction is much more complex than the > previous ones. > > I'm surprised it failed there. It looks to me like > the handler for pmovmskb > (xmm version), around line 11860 of guest_am64_toIR.c, can > handle the > redundant rex prefix (0x48). > > J > |