Windows 64 with gcc

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digo_rp
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Windows 64 with gcc

Post by digo_rp »

guys I move to winxp x64 so now I got an error, windows says that I need to use 64bits version of gcc

I´m using djgpp

anyone knows any way to use other C compiler to compile my 32bits kernel under winxp64 ?
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AJ
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Post by AJ »

Hi,

Not that I've tried it under XP64, but I think a Cygwin Cross-Compiler will be your friend here (I assume Cygwin works ok under Win64?).

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Adam
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os64dev
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Post by os64dev »

gcc has no native 64bit support only in 32bit crosscompiler. In short it will not work, though i thought that xp64 could run 32bit processes.
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AJ
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Post by AJ »

How about installing WinXP 32 bit on MS Virtual PC and having a shared folder? (half joking) :)

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Adam
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JamesM
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Post by JamesM »

Try it under cygwin.
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JAAman
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Post by JAAman »

JamesM wrote:Try it under cygwin.
exactly...

DJGPP is a 16bit program, and CPUs while running in 64bit mode, will work fine with 32bit programs, but not 16 bit programs
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Post by niteice »

Technically, the processor supports it, but Microsoft consciously chose to not support NTVDM under x64. Not a bad idea at all.
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Post by bluecode »

niteice wrote:Technically, the processor supports it, [...].
You mean in long-mode? I was pretty sure the processor does not support that. :?
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Post by Brynet-Inc »

16bit code cannot run natively in long mode....

It does seem reasonable that Microsoft would remove such a dated compatibility layer.. it's essentially a minimal x86 emulator right?
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Post by Combuster »

Apparently some people couldn't be bothered to read the documentation :cry:
The AMD Manual wrote:1.3.3 Compatibility Mode
Compatibility mode, a submode of long mode, allows system software to implement binary
compatibility with existing 16-bit and 32-bit x86 applications. It allows these applications to run,
without recompilation, under 64-bit system software in long mode, as shown in Table 1-1 on page 11.
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Post by Brynet-Inc »

Learn something new every day... :wink:
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Post by JAAman »

Combuster wrote:Apparently some people couldn't be bothered to read the documentation :cry:
The AMD Manual wrote:1.3.3 Compatibility Mode
Compatibility mode, a submode of long mode, allows system software to implement binary
compatibility with existing 16-bit and 32-bit x86 applications. It allows these applications to run,
without recompilation, under 64-bit system software in long mode, as shown in Table 1-1 on page 11.
and appearantly some people dont know the difference between 16bit PMode, and 16bit RMode -- when i said it was 16bit i intended to imply that it was real mode -- in LMode 16bit PMode is allowed, but not 16bit RMode

when you run DJGPP under windows, windows launches a VMode process to run it in... VMode cannot be used while in LMode...
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