gensyscalls: alignment fixup for ARM

ARM ABI has different alignment requirements based on parameter size:
* parameters not larger than 4 bytes are aligned on 4 bytes
* parameters larger than 4 bytes are aligned on 8 bytes

see:
Procedure Call Standard for the Arm Architecture
sections 5.1, Fundamental Data Types
and 6.5, Parameter Passing

Therefore the following changes are introduced in gensyscalls tool:
* new optional define SYSCALL_LONG_PARAMETER_ALIGNMENT_TYPE is introduced
* it's defined only on ARM
* on other architectures it takes on the value of SYSCALL_PARAMETER_ALIGNMENT_TYPE as a default
* constants kLongParameterAlignmentType and kLongParameterAlignmentSize are introduced
* Syscall::AddParameter uses this value for aligning parameters larger than 4 bytes

Change-Id: I7e766e0ea9d07001643e813722b462b1f044921a
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5112
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>

Changed the way the syscall infos are generated. We no longer include the
preprocessed <syscalls.h> header in sources compiled for the build platform.
Instead we're generating macros for the return type and parameter type sizes
via the CreateAsmStructOffsetsHeader rule (no template magic anymore) and
thus get a clear separation of host and target code, resulting in better
portability (although surprisingly enough the build already worked on 64 bit
hosts).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34323 a95241bf-73f2-0310-859d-f6bbb57e9c96

Patch by Michael Lotz fixing a missing typedef when compiling with
native compiler gcc 2 and cross-compiler gcc 4.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25740 a95241bf-73f2-0310-859d-f6bbb57e9c96

Reworked the way how the gensyscalls stuff finds out about
the sizes and alignments of syscall parameters. It no longer
generates and compiles functions with the same signature as the
syscalls. This simply doesn't generally work for cross-compilation.
Instead we provide a bit of architecture-specific code that knows
how things work for the target architecture.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15196 a95241bf-73f2-0310-859d-f6bbb57e9c96

We now also store the names of syscall parameters. This is used for strace. Well, not yet, but it would make a nice extension. :-)


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@11338 a95241bf-73f2-0310-859d-f6bbb57e9c96

Had to change the mechanism for automatically generating most of the
boring syscall stuff. It has two phases now: The first one
(gensyscallinfos) parses syscalls.h and generates a source file containing
all the required information. This file is compiled and linked to
gensyscalls, which generates the actual output files.
Added to the build.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8697 a95241bf-73f2-0310-859d-f6bbb57e9c96

Changed the way the syscall infos are generated. We no longer include the
preprocessed <syscalls.h> header in sources compiled for the build platform.
Instead we're generating macros for the return type and parameter type sizes
via the CreateAsmStructOffsetsHeader rule (no template magic anymore) and
thus get a clear separation of host and target code, resulting in better
portability (although surprisingly enough the build already worked on 64 bit
hosts).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34323 a95241bf-73f2-0310-859d-f6bbb57e9c96

Patch by Michael Lotz fixing a missing typedef when compiling with
native compiler gcc 2 and cross-compiler gcc 4.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25740 a95241bf-73f2-0310-859d-f6bbb57e9c96

Reworked the way how the gensyscalls stuff finds out about
the sizes and alignments of syscall parameters. It no longer
generates and compiles functions with the same signature as the
syscalls. This simply doesn't generally work for cross-compilation.
Instead we provide a bit of architecture-specific code that knows
how things work for the target architecture.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15196 a95241bf-73f2-0310-859d-f6bbb57e9c96

We now also store the names of syscall parameters. This is used for strace. Well, not yet, but it would make a nice extension. :-)


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@11338 a95241bf-73f2-0310-859d-f6bbb57e9c96

Had to change the mechanism for automatically generating most of the
boring syscall stuff. It has two phases now: The first one
(gensyscallinfos) parses syscalls.h and generates a source file containing
all the required information. This file is compiled and linked to
gensyscalls, which generates the actual output files.
Added to the build.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8697 a95241bf-73f2-0310-859d-f6bbb57e9c96