On 07/06/20 22:03, Tom Lendacky wrote: > On 7/2/20 2:04 AM, Dong, Eric wrote: >> Hi Tom, > > Hi Eric, > >> >> We have root cause this Mac file format issue. The patch mail from your side >> include extra two "=0D=0D" , and our test tool convert them to "\r\r". This >> is Mac file line ending format. So this issue been reported. We have updated >> our tool to handle this special case. > > Good to know, thanks! > >> >> With that change, now I met below error when use VS2015 tool chain. Can you >> help to fix it? >> >> Building ... >> g:\edk2-open-source\edk2\MdePkg\Library\PeiCoreEntryPoint\PeiCoreEntryPoint.inf >> [X64] >> PeCoffLoaderEx.c >> g:\edk2-open-source\edk2\OvmfPkg\Library\VmgExitLib\VmgExitVcHandler.c(386): >> warning C4334: '<<': result of 32-bit shift implicitly converted to 64 bits >> (was 64-bit shift intended?) >> NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio >> 14.0\Vc\bin\x86_amd64\cl.exe"' : return code '0x2'
This is for the line Displacement *= (1 << Ext->Sib.Scale); from [edk2-devel] [PATCH v9 17/46] OvmfPkg/VmgExitLib: Add support for NPF NAE events (MMIO) > > Yup, looks like that needs to be a "1ULL <<" instead of "1 <<". > I have verified that fixes the issue. I disagree. At that point, Displacement is of type INT64, and it may well be a negative value. We definitely want to multiply it by a signed int (values 1, 2, 4, 8). I commented on this before. Please see: (i) my comment block (10) here -- especially comment (10c): https://edk2.groups.io/g/devel/message/60144 (alternative link: <169e44cb-2c1c-6d9a-342a-2a1f618e3753@redhat.com">http://mid.mail-archive.com/169e44cb-2c1c-6d9a-342a-2a1f618e3753@redhat.com>) (ii) and my comment here: https://edk2.groups.io/g/devel/message/60146 (alternative link: <139ce789-b938-c8b9-030e-c1b6c67e47ea@redhat.com">http://mid.mail-archive.com/139ce789-b938-c8b9-030e-c1b6c67e47ea@redhat.com>). The compiler warning is well-meaning, but unnecessary. A 64-bit shift is *NOT* intended. We want to end up with one of the signed int (aka INT32) values 1, 2, 4 or 8. And then multiply the INT64 Displacement with that value. For the multiplication, the INT32 value 1, 2, 4 or 8 will be implicitly converted to INT64. That's entirely intentional. If we want to suppress the warning, while keeping the logic intact, we should employ an explicit cast: Displacement *= (INT64)(1 << Ext->Sib.Scale); > > One thing I noticed is that the 32-bit builds > (PlatformCI_OvmfPkg_Windows_VS2019_PR, Platform_CI OVMF_IA32_NOOPT and > Platform_CI OVMF_IA32X64_NOOPT) encounter an error: > > ERROR - Linker #2001 from SecMain.lib(SecMain.obj) : unresolved external > symbol __allshl > ERROR - Linker #1120 from > d:\a\1\s\Build\Ovmf3264\NOOPT_VS2019\IA32\OvmfPkg\Sec\SecMain\DEBUG\SecMain.dll > : fatal 1 unresolved externals > ERROR - Compiler #1077 from NMAKE : fatal '"C:\Program Files > (x86)\Microsoft Visual > Studio\2019\Enterprise\VC\Tools\MSVC\14.26.28801\bin\Hostx86\x86\link.exe"' : > return code '0x460' > > Any idea what is causing this error? A left-shift operator (<<) applied to a 64-bit operand is somehow finding its way into the 32-bit SEC build. That is indeed wrong (for such cases, we're supposed to use LShiftU64() from BaseLib). What I don't understand however is that all of the "<<" operator uses, on 64-bit operands, should already be limited to code that is *only* built for X64! For example, with this series applied, SecMain in OVMF consumes "UefiCpuPkg/Library/CpuExceptionHandlerLib/SecPeiCpuExceptionHandlerLib.inf". And the latter consumes VmgExitLib. But VmgExitLib is resolved to "UefiCpuPkg/Library/VmgExitLibNull/VmgExitLibNull.inf", in the IA32 and IA32X64 DSC files. This Null instance contains no left-shifts. Therefore any << operators, applied to 64-bit operands, present in "OvmfPkg/Library/VmgExitLib", should never be compiled for IA32 and IA32X64. So I don't know where the problematic "<<" comes from. It does not come from VmgExitLib, as far as I can tell. Thanks, Laszlo -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#62166): https://edk2.groups.io/g/devel/message/62166 Mute This Topic: https://groups.io/mt/74692413/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-