Solaris/x64 support for LuaJIT
- From: Dmitri Shubin <sbn@xxxxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Mon, 25 Jun 2012 16:40:26 +0400
Hello!
I'm currently working on making LuaJIT works on Solaris/x64
As DeN pointed out here
//www.freelists.org/post/luajit/LuaJIT-on-solaris-64 there are (at
least) 2 problems with it:
1. dynamic library support is disabled in Makefile (see
http://lua-users.org/lists/lua-l/2011-06/msg00415.html);
2. LuaJIT need mmap() to allocate pages from first 2G of process address
space, but Solaris ignores mmap() hints.
I was able to avoid 2-nd problem by moving executable text and data as
high as possible (used 0x70280000) and allocating pages with
mmap(MAP_FIXED) from range 0x10000 to 0x70280000.
So statically linked luajit is now more or less works.
Right now dynamically linked luajit crashes to core.
One of the problem I found is that Solaris loads all shared libraries to
high half of address space:
sbn@mojo $ pmap /cores/luajit.15920 |grep luajit
core '/cores/luajit.15920' of 15920: ../src/src/luajit test.lua
FFFFFD7FFF2F0000 628K r-x--
/tb/builds/thd/sbn/2.5/src/thirdparty/LuaJIT/2.0.0-beta10/src/src/libluajit.so
FFFFFD7FFF39C000 12K rw---
/tb/builds/thd/sbn/2.5/src/thirdparty/LuaJIT/2.0.0-beta10/src/src/libluajit.so
And AFAIU generated code assume that it could jump to some of its
functions (e.g. lj_vm_exit_handler) using 32-bit displacement which
isn't true.
I replaced jmp <disp32> instruction with
jmpq *0(%rip)
.quad lj_vm_exit_handler
sequence in and removed check in mcode_alloc(), but it still crashes.
Probably there are some other places in luajit that implicitly assume
that shared libraries are loaded within (1<<47) of address space?
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