Add a no-op for zero length in ChangeProtectionFlags.
This fixes AMD Vivado 2025.2 which tries to mprotect with 0 as size and merge strategies fails:
```
Unexpected ChangeProtectionFlags Merge strategy! [0x400000, 0x401000) Versus [0x0, 0x0)
```
Fixes b4a87d8c0b
`FEX_APP_CONFIG_LOCATION` wasn't overriding paths properly anymore once
that commit landed. Instead legacy `~/.fex-emu/` path would get returned
if it existed first.
Ensures that it returns first, before `STEAM_COMPAT_DATA_PATH` even.
We were passing through 32-bit signed values to the 64-bit handler,
which isn't valid and we need to make sure to sign extend.
I don't think this fixes anything because negative values aren't valid,
but a negative could have been interpreted as a large positive without
this.
So WTF can see their usage. Previously didn't add this due to some weird
madvise bug that delete anon names, but that seems to be fixed in a
newer kernel.
Fixes#5230
Basically just stores it as an array of `uint8_t`, and automatically
pads it out to 24 bytes. Hopefully FEX never reaches SHA1 collisions so
this should (TM) never collide.
Note: I have no idea how fmt will handle that format string with an
array of uint8_t.
Signed-off-by: crueter <crueter@eden-emu.dev>
No need for individual calls here. While doing this I also realized
xxhash has this at one point, I guess I'll PR that there later
Signed-off-by: crueter <crueter@eden-emu.dev>
Uses ALIAS targets to propagate include directories to targets rather
than polluting the preprocessor with an extra include directory it
usually doesn't need.
Signed-off-by: crueter <crueter@eden-emu.dev>
rpmalloc is currently very aggressively configured which causes
significant reductions in resident memory over jemalloc.
In Bayonetta's title screen it went from 963MB down to 834MB resident.
Mesa uses this to determine what the executable name is in a process for
application profiles. Without thunking, the guest glibc sets this
correctly, with thunking mesa would pick up `FEX` instead of the app.
With this fixed, it fixes Dead Island rendering when thunks are enabled.
Plenty of other games in Mesa's application profiles that it would fix
as well.
When an anonymous FD is passed to execveat that has the CLOEXEC flag
set, then binfmt_misc fails with ENOENT.
Workaround this limitation by duplicating the FD, stripping its CLOEXEC
flag in the process.
For #5234
On 36-bit VA systems the stack was ending up /wherever/ when it should
be at the top of the VA space (usually).
Additionally VDSO was getting mapped anywhere on 64-bit, so push that to
the top of the VA space as well.
Also removes a check for old kernels not supporting MAP_FIXED_NOREPLACE.
This was a nasty race condition where each thread could be accessing the
DRM cache at any given moment. Move it over to a per thread object that
is only allocated once it gets used.
Also removes an `atexit` registration that contributes to crashing on
exit.
Previously, FEX would use `$HOME/.fex-emu` for its data and config if
`XDG_CONFIG_HOME` and/or `XDG_DATA_HOME` were unset. This doesn't follow
XDG, so instead we do a fallback to `$HOME/.config` and
`$HOME/.local/share` respectively if XDG env vars are unset. Also,
pre-emptively creates those directories since `~/.local/share` and
`~/.config` existing is technically not a guarantee if XDG dirs are unset.
Signed-off-by: crueter <crueter@eden-emu.dev>
These three objects are easy enough to move out of the static namespace.
They were causing atexit registrations for deallocating memory.
Removes three `atexit` registrations that contributes to crashing on
exit.
Applications can use this to ensure they've grabbed the whole XSTATE
correctly. UML uses it to determine if the FPState was correctly saved.
Also adds a unittest to ensure the same correct behaviour.
For #5206
Turns out the Linux kernel's definition of `MINSIGSTKSZ` and glibc's
definition of `MINSIGSTKSZ` don't match.
The linux kernel has a massive comment about it in `arch/x86/kernel/signal.c`.
Also adds a unittest for it.
For #5206
This is fundamentally a frontend only problem, and also Linux only.
Moves it to the frontend where it belongs.
There's likely more things in Allocator.cpp that can be moved to the
frontend but this is the first thing.
NFC
UML disables ASLR using a personality. FEX in the ELFCodeLoader was
accidentally erasing personalities. This caused UML to do a bootloop
trying to repeat disable ASLR.
It now gets ASLR disabled, but fails shortly afterwards.
For #5206
Ryan Houdek