I've disabled both the JIT and FFI for now. I've also stripped almost
all of the assembly out of vm_s390x.dasc, leaving only labels for the
most part. This is enough to get LuaJIT to compile but of course if
you try and run it it will explode.
The idea now is to re-add enough functionality to get a very basic
Lua program to run.
added definations to macros to test operand type refeered x86 definations
no JUMP instruction found for s390x used BRANCH RELATIVE on CONDITION instead (brc)
Not sure how the condition will be checked , need to discuss this
added instructions to macros, referring macro defination of x86
for macro ins_ANDdid not find equivalent s390x replacement instruction for 'Not' hence have currently marked the place as '????'
'????' has to be replaced with s390x complement instruction
f8-f15 are callee-saved (not f0,f2,f4 and f6). There isn't space
for them in the caller's stack frame so we need to increase the
size of the interpreter's stack frame.
I believe these macros obey the C calling convention, so we need to
allocate our stack frame and save all callee-save registers. We
can tune it later if it turns out we don't need all the registers.
