Hi Andrew, That you are right, in Main.c the main shouldn't have the EFIABI as Jordan pointed in his message. Your detailed explanation helps me to understand a little better the whole environment.
Thank you, Mauro On Tue, Jan 15, 2013 at 1:21 PM, Andrew Fish <af...@apple.com> wrote: > In my previous mail to this thread I explained the usage of EFIABI and the > differences in the calling convention. If you are seeing an EFIABI issue with > main() this is what you should look for.... > > The EFIABI calling convention for X64 passes the first 4 arguments in > registers RCX is arg1, RDX is arg2, R8 is arg3, and R9 is arg4. The System V > calling convention for X64 uses 6 registers and the sequence is RDI, RSI, > RDX, RCX, R8, and R9. If you poke around in gdb you can look at the registers > and see what values are being passed, and what values are being used by the C > code. Since main has EFIABI you would expect Argc is in RDX, if you see RDI > being used then you know the compiler did not generate the correct EFIABI > calling convention. If RDX has a bad value it could be an issue with the > caller not calling with EFIABI. > > I'm not really familiar with the StdLib, but I did a quick grep and it looks > like main is called from LibC as int main(int, char **) and not int EFIABI > main (int, char **). > > Andrew Fish > > > On Jan 11, 2013, at 6:24 AM, Mauro Faccenda <facce...@gmail.com> wrote: > >> Hi all, >> >> I am trying to get started with EDK2 development and I'd like to >> report some difficulties I had and am having. >> >> If any of you can point to some way to fix or even better way of doing >> anything, I'd appreciate. >> >> I am willing to use a plain Ubuntu 12.04 64bits as development >> platform as it comes with GCC 4.6 which seems to be well supported by >> the EDK2 and BaseTools. >> >> But here comes to me the first question: which (if any) are the >> recommended (default) platform for development? I guess it is using >> Windows with VS since the configuration comes with all parameters set >> to use it. But I'd like to know If there is any 'better supported' >> Linux platform (distro, distro version+gcc version). >> >> The Project Wiki mentions Ubuntu 9.10, 10.10 and 10.04, and GCC 4.4, >> but doesn't recommend any. >> >> For instance, I followed this documentation: >> http://sourceforge.net/apps/mediawiki/tianocore/index.php?title=Using_EDK_II_with_Native_GCC_4.4 >> >> Moving on, as I want to play with network connections, I built my own >> OVMF with the Intel's E1000 Network drivers successfully using the >> sources from EDK2 trunk. >> >> I already could run qemu with network support (using tap + bridge with >> host physical interface) and use ping.efi (from the EDK2 Toolkit) >> against devices on my network, also no problems besides the latency >> being a bit high (>400ms, from the host I get less than 1ms). >> >> Then I started building some applications to test running in the >> environment. I've built the MdeModulePkg and could run some of them. >> But when I tried to build AppPkg I got the following error: >> $ build -t GCC46 -a X64 -p AppPkg/AppPkg.dsc >> [...] >> edk2/StdLib/LibC/Containers/Queues/Fifo.c:508:27: error: assignment >> from incompatible pointer type [-Werror] >> cc1: all warnings being treated as errors >> >> As it seems to be a warning promoted to an error, I manually ran the >> same gcc command removing the -Werror parameter and it compiled >> successfully. >> >> Is this a bug? Should I report? >> >> Then I ran the build command again, which brought another error: >> >> edk2/StdLib/LibC/Uefi/InteractiveIO/IIOutilities.c:269:1: error: >> conflicting types for ‘IIO_CursorDelta’ >> edk2/StdLib/LibC/Uefi/InteractiveIO/IIOutilities.h:122:1: note: >> previous declaration of ‘IIO_CursorDelta’ was here >> >> I opened both files looking for the definition of IIO_CursorDelta and >> in .h file I got: >> -- >> int >> EFIAPI >> IIO_CursorDelta ( >> cIIO *This, >> CURSOR_XY *StartXY, >> CURSOR_XY *EndXY >> ); >> -- >> while in the .c I got: >> -- >> UINT32 >> EFIAPI >> IIO_CursorDelta ( >> cIIO *This, >> CURSOR_XY *StartXY, >> CURSOR_XY *EndXY >> ) [...] >> -- >> >> So I changed the .h from int to UINT32 and ran the build again. This >> time with success. Should I report this? >> >> After that, I started to play with AppPkg/Applications/Main/Main.c, >> trying to poke around to see what I can or can't do and got something >> strange. I've changed the Main.c to just print the Argc value: >> -- >> #include <stdio.h> >> int >> EFIAPI >> main ( >> IN int Argc, >> IN char **Argv >> ) >> { >> printf("\nArgc=%d\n", Argc); >> return 0; >> } >> -- >> And whenever I run it on UEFI Shell (using qemu), I always get really >> big values (> 37000000) no matter with how many parameter I run and if >> I run with the same parameter multiple times, the value sometimes >> changes, as you can see on the image below: >> >> http://s1.postimage.org/dxeg7ahdr/argc.png >> >> This isn't exactly a problem, since I still can successfully run >> normal code but I'd like to know if am I doing something stupid, if >> this is some kind of bug or if it is a side effect of something I >> couldn't see yet. >> >> Any tips or clarifications will be really appreciated. >> >> Anyway, thanks for the good job you all have been doing on this project. =) >> >> Mauro Faccenda >> >> ------------------------------------------------------------------------------ >> Master HTML5, CSS3, ASP.NET, MVC, AJAX, Knockout.js, Web API and >> much more. 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