Each GCN instruction is re-encoded to its RDNA form and decoded by the
existing RDNA decoder, so the PS4 path shares the recompiler. Covers the
legacy VS stage (program at the VS slot, user SGPRs from s0, vertex and
instance index in v0-v3), fetch shaders linked as user-data calls, MIMG
(image_sample and friends), PS4 buffer descriptors (GCN DATA_FORMAT /
NUM_FORMAT, 44-bit base) and T# image descriptors (GCN tiling in word 7).
The GCN switch is keyed into the shader disk cache. PS5 behaviour is
unchanged: every PS4-only rule is gated on GcnGuestShaders().
A null or uninitialized attribute, and a kind outside 1 to 4, threw
std::invalid_argument. They now go through NotImplemented_nid_no_patch,
as pthread_rwlockattr_settype_np's unmeasured types do. FreeBSD 11
libthr stores an unknown kind unchecked and answers a null attribute
with -1 and errno EINVAL, so scePthreadMutexattrSettype's
SCE_KERNEL_ERROR_EINVAL would match neither answer.
pthread_rwlockattr_settype_np stored any type and returned 0. The console's answer to a type outside 0 to 2 is unknown, and shadPS4 returns EINVAL once the stored type is above 2, so such a type now goes through NotImplemented_nid_no_patch. Types 0 to 2 are stored but not applied, so the debt entry moves to the silent stubs.
The SCE name moves from a libkernel_sys stub to libkernel. Kinds
MutexType::ErrorCheck (1) to MutexType::Adaptive (4) are the mutex
types FreeBSD 11 libthr's pthread_mutexattr_setkind_np stores, and are
set through scePthreadMutexattrSettype, which maps the same values onto
those types. Other kinds and a null or uninitialized attribute throw, as
their console answer is not known.
guest_kernel_sys_pthread_np_kind round-trips kinds 2, 3, 4 and 1
through pthread_mutexattr_gettype, checks that kind 1 makes a second
lock return EDEADLK and kind 2 lets it succeed, and checks the throws
for kinds 0, 5 and -1 (the type unchanged) and for a destroyed or null
attribute.
The POSIX name moves from a libkernel_sys stub to libkernel and stores the
type through its SCE twin scePthreadRwlockattrSettype, converting the
result as the other POSIX rwlock calls do.
guest_kernel_sys_pthread_np_rwlockattr checks types 0, 1 and 2 through
both names, a rwlock built from the attribute, and the throws for a
destroyed or null attribute.
Titles register and check NetCtl callbacks without importing
sceNetCtlInit: libSceNetCtl is an internal sysmodule the system has
started before the title runs. 007 First Light traps at start-up when
sceNetCtlRegisterCallback answers NOT_INITIALIZED.
NpTrophy reads the trophy count and icons from the title's trophy
package (names are encrypted and stay not implemented), PS4 v1 save data
calls wrap the native v2/v3 ones, and NpWebApi library contexts, handles
and push event filters work offline (service filters fail without a
signed-in user). libSceAjm is built from the libSceAjm.native sources
for PS4 titles. Limbo's (CUSA01664) remaining PS4 imports, including the
synchronous PS4 TUS calls and the Facebook dialog calls next to the
existing libraries, are exported as not implemented.
Yunus Shaikh