[Bug 33349] Use Thumb binaries on ARM?

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=33349

--- Comment #2 from André H. <nerv at dawncrow.de> 2013-04-13 10:20:40 CDT ---
(In reply to comment #1)
> Hello André,
> 
> as I told in earlier Wine/ARM bugs, Thumb-2 is the default for Win32 ARM PE
> binaries.
> Most ARM Linux distros (Debian, Ubuntu, Fedora?) use ARMv7-A + VFPv3-D16 +
> Thumb-2 profile (Cortex-A).
> So forcing Wine code to be compiled for ARM mode on these systems is not
> optimal.
> 
> For the compiler flags, yes "-mthumb" would be sufficient, no need for
> "-mthumb-interwork".
> My toolchains have Thumb-2 as default profile, so there would be no need for
> any CFLAGS override.
> 
> Building Wine as thumb code causes issues for "naked" functions with explicit
> ".arm" directive because the linker won't insert ARM-Thumb interworking veneers
> automatically.
> Raising "unimplemented API" exception currently fails because of that:

That's one of those things -mthumb-interwork is for and it doesn't increase the
size of the binaries, so to be sure i'd rather use it. Further
RtlCaptureContext needs to be ARM or Thumb-2 because of the instructions used,
but as long as possible i also want to support older ARM chips at least for
winelib. So i choose to use ARM assembler for such functions (same for relay
logging, which actually only works with -marm)

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