On Aug 27, 2014, at 8:08 PM, Gao, Liming <liming....@intel.com> wrote:
> Hi,
> What change do you make? In previous mail, you mention x86_64 there is no
> issue.
>
Liming,
On the various GNU (including clang) toolchains __USER_LABEL_PREFIX__ is the
prefix applied to user labels (symbols visible to C) in assembly. Some versions
set it to '', and some version have it set to ‘_'
#define ASM_PFX(name) _CONCATENATE (__USER_LABEL_PREFIX__, name)
So you can have a bug that passes on one version and fails on another.
Thanks,
Andrew Fish
> Thanks
> Liming
> From: Sergey Isakov [mailto:isakov...@bk.ru]
> Sent: Thursday, August 28, 2014 4:42 AM
> To: edk2-devel@lists.sourceforge.net
> Subject: Re: [edk2] [PATCH 0/8] NASM: Object files; Thunk16; Require for
> non-MSVC
>
> The error disappeared but I still have other mistakes
> ld: illegal text-relocation to '_NullSeg' in … BaseLib.lib(Thunk16.obj) from
> '_16GdtrBase’ in … BaseLib.lib(Thunk16.obj) for architecture x86_64
> Still in work
>
> On 28 авг. 2014 г., at 0:33, Jordan Justen <jljus...@gmail.com> wrote:
>
>
> On Wed, Aug 27, 2014 at 1:08 PM, Sergey Isakov <isakov...@bk.ru> wrote:
>
> And one new question. Why _16GdtrBase with underscore while m16Start without
> it?
>
> Does replacing m16Start with ASM_PFX(m16Start) help?
>
> It looks like I didn't convert this up properly. The MASM code didn't
> use ASM_PFX...
>
> -Jordan
>
>
> ——
> ;
> ; These are global constant to convey information to C code.
> ;
> ASM_PFX(m16Size) DW InternalAsmThunk16 - m16Start
> ASM_PFX(mThunk16Attr) DW _BackFromUserCode.ThunkAttrEnd - 4 -
> m16Start
> ASM_PFX(m16Gdt) DW _NullSeg - m16Start
> ASM_PFX(m16GdtrBase) DW _16GdtrBase - m16Start
> ASM_PFX(mTransition) DW _EntryPoint - m16Start
>
> —
> I got an error with this
> Thunk16.iii:60: error: symbol `m16Start' undefined
>
>
> On 27 авг. 2014 г., at 22:04, Jordan Justen <jljus...@gmail.com> wrote:
>
> On Wed, Aug 27, 2014 at 5:18 AM, Sergey Isakov <isakov...@bk.ru> wrote:
>
> Hi sirs,
> I tested Thunk16.nasm too. For x86_64 there is no issue.
> For ia32 compilation disasm shows not good codes
> ---------
> 00000000 <m16Start>:
> 0: 00 00 add %al,(%eax)
> 2: 00 00 add %al,(%eax)
> ...
>
> 00000006 <_BackFromUserCode>:
> 6: 16 push %ss
> 7: 0e push %cs
> 8: 67 e8 00 00 66 9c addr16 call 9c66000e
> <InternalAsmThunk16+0x9c65ff36>
>
> 0000000c <_BackFromUserCode.Base>:
> c: 66 9c pushfw
> e: fa cli
>
> ---------
> to compare gcc-4.9.1 cvompilation
> ---------
> 00000000 <m16Start>:
> 0: 00 00 add %al,(%eax)
> 2: 00 00 add %al,(%eax)
> ...
>
> 00000006 <BackFromUserCode>:
> 6: 16 push %ss
> 7: 0e push %cs
> 8: 66 e8 00 00 callw c <BackFromUserCode+0x6>
> ...
>
> 0000000e <L_Base1>:
> e: 66 9c pushfw
> 10: fa cli
>
> ----------
> May be change a32 prefix to o32 in the line:
> "a32 call .Base ; push eip"
> ?
>
>
> In the X64 file, I used:
> call dword .Base
>
> I notice this produced the same code as:
> o32 call dword .Base
>
> But,
> o32 call .Base
> seems to produce invalid code. (OVMF hangs.)
>
> It does seem like:
> a32 call .Base
> is functional as well, but I know we are attempting to make the new
> nasm code produce similar code to the old asm code where reasonable.
>
> I think I only changed it in the X64 file to try to match the old 'db' code.
>
> -Jordan
>
> On 27.08.2014, at 9:50, Jordan Justen wrote:
>
> On Tue, Aug 19, 2014 at 4:57 PM, Jordan Justen
> <jordan.l.jus...@intel.com> wrote:
>
> This series:
>
> * Adds support for creating object files from .nasm source files to
>
> allow NASM source files to be linked into libraries and images
>
> * Adds NASM source files for Thunk16 on IA32 and X64
>
> * Convert BaseLib to use NASM Source Files for Thunk16 rather than
>
> GNU Assembler (.S) files
>
> - This will make NASM a build requirement for MdePkg with IA32 &
>
> X64 on all toolchains except MSVC and ICC.
>
>
> Thanks for Liming Gao for the tools_def changes for MSVC. (But, these
>
> have not been tested very well yet.)
>
>
> This series is available in this git branch:
>
> https://github.com/jljusten/edk2.git nasm-v1
>
>
> I update my nasm branch based on the feedback.
>
> The differences vs. v1 are in the attached patch.
>
> Is anyone interested in seeing a v2 posted to the list?
>
> Liming, in patch 1, I mentioned I only tested with GCC49. Did you have
> any testing to add to that?
>
> -Jordan
>
> Jordan Justen (8):
>
> BaseTools/tools_def: Add NASM_FLAGS
>
> BaseTools/build_rule: Add .nasm => .obj build rule
>
> MdePkg/Base.h: Always define ASM_PFX
>
> MdePkg/BaseLib Thunk16: Replace IA32 GAS Thunk16 with NASM version
>
> MdePkg/BaseLib Thunk16: Replace X64 GAS Thunk16 with NASM version
>
> MdePkg/BaseLib NASM Thunk16: Use NASM local labels
>
> MdePkg/BaseLib NASM Thunk16: Use bits 16 for 16-bit code
>
> MdePkg/BaseLib NASM Thunk16: Remove remaining 'DB' code
>
>
> BaseTools/Conf/build_rule.template | 15 ++
>
> BaseTools/Conf/tools_def.template | 287 ++++++++++++++++++++++++++-
>
> MdePkg/Include/AArch64/ProcessorBind.h | 4 +
>
> MdePkg/Include/Arm/ProcessorBind.h | 4 +
>
> MdePkg/Include/Base.h | 25 ++-
>
> MdePkg/Include/Ebc/ProcessorBind.h | 4 +
>
> MdePkg/Include/Ia32/ProcessorBind.h | 4 +
>
> MdePkg/Include/Ipf/ProcessorBind.h | 4 +
>
> MdePkg/Include/X64/ProcessorBind.h | 4 +
>
> MdePkg/Library/BaseLib/BaseLib.inf | 4 +-
>
> MdePkg/Library/BaseLib/Ia32/Thunk16.nasm | 260 +++++++++++++++++++++++++
>
> MdePkg/Library/BaseLib/X64/Thunk16.nasm | 321
> +++++++++++++++++++++++++++++++
>
> 12 files changed, 914 insertions(+), 22 deletions(-)
>
> create mode 100644 MdePkg/Library/BaseLib/Ia32/Thunk16.nasm
>
> create mode 100644 MdePkg/Library/BaseLib/X64/Thunk16.nasm
>
>
> --
>
> 2.1.0
>
>
>
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