Kevin Enderby 86c0541716 Next set of additional error checks for invalid Mach-O files for the ...

load commands that use the MachO::thread_command type
but are not used in llvm libObject code but used in llvm tool code.

This includes the LC_UNIXTHREAD and LC_THREAD
load commands.

A quick note about the philosophy of the error checking in
libObject for Mach-O files, the idea behind the checking is
that we never will return a Mach-O file out of libObject that
contains unknown things in the load commands.

To do this the 32-bit ARM and PPC general tread states
needed to be defined as two test case binaries contained
them.  If other thread states for other CPUs need to be
added we will do that as needed.

Going forward the LC_MAIN load command is used to
set the entry point in Mach-O executables these days
instead of an LC_UNIXTHREAD as was done in the past.
So today only in core files are LC_THREAD load commands
and thread states usually found.

Other thread states have not yet been defined in
include/Support/MachO.h at this time.  But that can be
added as needed with their corresponding checking also
added.

llvm-svn: 284668

2016-10-19 23:44:34 +00:00

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