PPSA28997 (IL2CPP) calls sceLibcBacktraceGetBufferSize and
sceLibcBacktraceSelf. On Linux the host call stack is captured with
backtrace and each frame is resolved to its module and offset with
dladdr, then written as a linked list of frame records. The record
layout is inferred and listed in TechnicalDebt. Windows throws.
A ZArchive named app0.zar beside app0/ is a read-only layer under it. libc opens it at the first path resolution, looks paths missing from app0/ up case-insensitively, reads files across compressed blocks and keeps the archived descriptor table with shared positions.
Resolving an archive-only path through a call that does not read the archive throws instead of failing with ENOENT, as do opendir of a directory present in both places, fdopen of an archived descriptor and chdir into the archive. A path through .. in an archive-only directory resolves.
SonyCrt.hpp kept the constraint handler slot in an unnamed namespace,
so every source file that included it had its own slot. A handler
installed with set_constraint_handler_s in WideConversion.cpp was not
the one qsort_s in FileAndHeap.cpp called, and its violations aborted.
The slot and its mutex now have one instance per module, and the
handler type uses the guest calling convention, as the handlers a title
installs and the default handler it gets back are guest functions.
The Quake homebrew's libOSMesa.so.8 imports qsort_s, the only strong
import left unresolved once its symbol names resolve through NIDs.
qsort_s sorts as qsort does, with the context passed as the
comparator's third argument, and returns EINVAL after calling the
constraint handler for the runtime constraint violations of FreeBSD
13's qsort_s. The sort helpers take any comparator so both functions
share the FreeBSD 11 algorithm.
Use the registered application allocator and the source-backed alignment/size signature. Add callback ownership and failure checks; record unmeasured console behavior.
__std_find_trivial(_unsized), __std_count_trivial, __std_min/max/minmax_element,
__std_reverse_trivially_swappable, __std_reverse_copy_trivially_copyable and
__std_swap_ranges_trivially_swappable_noalias for 1-, 2-, 4- and 8-byte
elements, matching the libc.prx bundled with PPSA08427 including the rescan of
the first aligned block in the unsized find.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Q8tinbP1MUpUaDsbNWnGnu
__sync_fetch_and_{add,sub,and,or,xor}_16 and __sync_lock_test_and_set_16 are
cmpxchg16b loops returning the previous value, and __atomic_is_lock_free
answers by size and alignment, as in the libc.prx bundled with PPSA08427. Its
generic __atomic_load/store/exchange/compare_exchange are a ud2, so they throw.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Q8tinbP1MUpUaDsbNWnGnu
Soft-float arithmetic and comparisons, float/double/x87 conversions to and from
32-, 64- and 128-bit integers, __extendsfdf2, __truncdfsf2, complex
multiplication and division and __powixf2, matching the libc.prx bundled with
PPSA08427: soft-float results ignore MXCSR and raise no flags, division flushes
subnormal quotients, NaN payloads are moved unshifted and float-to-integer
conversions do not saturate.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Q8tinbP1MUpUaDsbNWnGnu
The libc.prx bundled with PPSA08427 returns 32 from __clzdi2 and __ctzdi2 and
64 from __clzti2 and __ctzti2 for a zero argument; found by comparing every
builtin against it on random inputs.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Q8tinbP1MUpUaDsbNWnGnu
Shifts, bit counts, comparisons, negation, multiplication, division and
remainder, __udivmodti4, the overflow-reporting __mulo* and the overflow
checking __addv*/__subv*/__mulv*/__negv*/__absv* families. Where the libc.prx
bundled with PPSA08427 differs from compiler-rt it is followed: __addv* and
__subv* wrap, and the 32-bit unsigned division returns 0 for a zero divisor.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Q8tinbP1MUpUaDsbNWnGnu
Implement __modti3, the signed 128-bit integer modulo runtime helper complementing __divti3, __udivti3 and __umodti3. Add unit test coverage in guest_crt_tests and document zero-divisor exception behavior in technical debt.
Borderlands 4 (PPSA01494) loads its UI library with
sceKernelLoadStartModule("/app0/prx/libRenoirCore.PS5.prx"), but ships
the module as prx/librenoircore.ps5.prx. On Linux the call fails:
Could not load /app0/prx/libRenoirCore.PS5.prx result 0, handle result -2147352574
(0x80020002, ENOENT). Guest paths are resolved case-insensitively, but
that only finds a component that exists. With the documented layout,
app0/prx holds only the converted librenoircore.ps5.prx.guest.prx,
so the requested name resolves to itself and RelinkedModulePath then
looks for "libRenoirCore.PS5.prx.guest.prx" with its exact spelling.
Windows and macOS hosts ignore the case, so only Linux is affected.
RelinkedModulePath now falls back to the same ASCII case-insensitive
match as ResolveHostPath when the exact <name>.guest.prx is missing,
and throws for an ambiguous match as that does. dlopen,
sceKernelLoadStartModule, stat, open and sceKernelCheckReachability all
go through it.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Guest path resolution trimmed the trailing slash of a path under a
mount alias (/savedata0, /download0, /app0 and the others), so the host
saw "file" for "file/": unlink, remove, sceKernelUnlink and rename
removed or moved the file, open opened it, and chmod and access
succeeded on it. The same path outside an alias already failed with
ENOTDIR, because the host got the slash.
FreeBSD 11.4 rejects it in lookup() (sys/kern/vfs_lookup.c):
/*
* If we're processing a path with a trailing slash,
* check that the end result is a directory.
*/
if ((cnp->cn_flags & TRAILINGSLASH) && dp->v_type != VDIR) {
error = ENOTDIR;
goto bad2;
}
On Linux and macOS a path under an alias now keeps its trailing slash
on the host path, as paths outside an alias do, so the host fails with
ENOTDIR for a file and directories with a trailing slash still work.
Windows keeps the previous behaviour; TechnicalDebt records it.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Aryan Sharma