[Valgrind-developers] Port to LoongArch64/Linux

[Feiyang C. <chr...@gm...>]

Hi,

I have rebased onto the latest commit and made some small fixes (the
last two commits), but I'm uncertain about these fixes.

https://github.com/FreeFlyingSheep/valgrind-loongarch64

The tests for close_range fail due to the if statement in POST(sys_close_range).

- if (ARG2 == ~0U)
+ if ((UInt)ARG2 == ~0U)

On LoongArch64/Linux, ARG2 is sign-extended, so I truncate it when
comparing it to ~0U.

The test for long_namespace_xml fails since Valgrind reports the following:

Conditional jump or move depends on uninitialised value(s)
   at 0x40624F4: bcmp (vg_replace_strmem.c:1233)
   by 0x415E1DB: std::ctype<char>::_M_widen_init() const (in
/usr/lib64/libstdc++.so.6.0.33)
   by 0x41D9067: std::basic_ostream<char, std::char_traits<char> >&
std::endl<char, std::char_traits<char> >(std::basic_ostream<char,
std::char_traits<char> >&) (in /usr/lib64/libstdc++.so.6.0.33)
   ...
   by 0x1200042BF: main (long_namespace_xml.cpp:45)

I added a suppression for this issue.

However, there are still two failures that I don't know how to solve.
1. The first one is pth_mutex_signal, which reports "The futex
facility returned an unexpected error code."
2. The second one is libvexmultiarch_test, which causes an assertion
failure in PPC:

vex: priv/host_ppc_defs.c:4754(emit_PPCInstr):
Assertion `delta >= 16 && delta <=32 && 0 == (delta & 3)' failed.
//// failure exit called by libVEX

I would appreciate your help with these issues and would like to know
when you might be available to review my patches.

Thanks,
Feiyang