feat(libkernel): implement pthread_attr_getstackaddr

core/libs/prx/libkernel/Pthread/Posix/Attr.cpp

@@ -83,6 +83,12 @@ int APS5_VABI pthread_attr_getstack_nid_postfix(const PthreadAttr* __restrict at
     return 0;
 }
 
+int APS5_VABI pthread_attr_getstackaddr_nid_postfix(const PthreadAttr* __restrict attr, void** __restrict stack_addr) {
+    if (!Valid(attr) || !stack_addr) return PosixThread::GUEST_EINVAL;
+    *stack_addr = (*attr)->stackAddress;
+    return 0;
+}
+
 int APS5_VABI pthread_attr_getstacksize_nid_postfix(const PthreadAttr* attr, size_t* stack_size) {
     if (!Valid(attr) || !stack_size) return PosixThread::GUEST_EINVAL;
     *stack_size = (*attr)->_stacksize;

core/libs/tests/GuestPthreadAttr.cpp

@@ -57,6 +57,7 @@ struct ReportedAttributes {
 extern "C" {
 int APS5_VABI pthread_attr_setstack_nid_postfix(PthreadAttr* attr, void* addr, std::size_t size);
 int APS5_VABI pthread_attr_getstack_nid_postfix(const PthreadAttr* attr, void** addr, std::size_t* size);
+int APS5_VABI pthread_attr_getstackaddr_nid_postfix(const PthreadAttr* attr, void** addr);
 }
 
 static ReportedAttributes Query(Pthread thread) {
@@ -248,16 +249,23 @@ int main() {
 
     PthreadAttr stackAttr = nullptr;
     char stackMarker;
+    void* reportedAddress = nullptr;
+    std::size_t reportedSize = 0;
     Require(pthread_attr_setstack_nid_postfix(nullptr, &stackMarker, STACK_SIZE) == 22);
     Require(pthread_attr_setstack_nid_postfix(&stackAttr, &stackMarker, STACK_SIZE) == 22);
+    Require(pthread_attr_getstackaddr_nid_postfix(nullptr, &reportedAddress) == 22);
+    Require(pthread_attr_getstackaddr_nid_postfix(&stackAttr, &reportedAddress) == 22);
     Require(scePthreadAttrInit(&stackAttr) == SCE_OK);
+    Require(pthread_attr_getstackaddr_nid_postfix(&stackAttr, nullptr) == 22);
+    Require(pthread_attr_getstackaddr_nid_postfix(&stackAttr, &reportedAddress) == 0 && reportedAddress == nullptr);
     Require(pthread_attr_setstack_nid_postfix(&stackAttr, &stackMarker, STACK_SIZE) == 0);
     Require(pthread_attr_setstack_nid_postfix(&stackAttr, nullptr, STACK_SIZE) == 22);
     Require(pthread_attr_setstack_nid_postfix(&stackAttr, &stackMarker, 16383) == 22);
-    void* reportedAddress = nullptr;
-    std::size_t reportedSize = 0;
     Require(pthread_attr_getstack_nid_postfix(&stackAttr, &reportedAddress, &reportedSize) == 0);
     Require(reportedAddress == &stackMarker && reportedSize == STACK_SIZE);
+    reportedAddress = nullptr;
+    Require(pthread_attr_getstackaddr_nid_postfix(&stackAttr, &reportedAddress) == 0 && reportedAddress == &stackMarker);
     Require(scePthreadAttrDestroy(&stackAttr) == SCE_OK);
     Require(pthread_attr_setstack_nid_postfix(&stackAttr, &stackMarker, STACK_SIZE) == 22);
+    Require(pthread_attr_getstackaddr_nid_postfix(&stackAttr, &reportedAddress) == 22);
 }

docs/dev/TechnicalDebt.md

@@ -386,7 +386,7 @@ Throughout the project, every function at every stage either **does exactly what
 - [realpath](../../core/libs/prx/libc/src/RealPath.cpp) (libc) follows FreeBSD 11's [`realpath.c`](https://github.com/freebsd/freebsd-src/blob/stable/11/lib/libc/stdlib/realpath.c) except for symlinks. The console's guest filesystem has none, so a host symlink under the guest root is followed for existence and type but not expanded, and `..` drops the previous component lexically, as `Resolve` does for every guest path. Through a host link `linkdir -> sub/deep`, `linkdir/../x` gives `x` beside the link, not beside its target.
 - [nan and nanf](../../core/libs/prx/libc/src/Math.cpp) (libc) return fixed quiet NaN values (`0x7fc00000` and `0x7ff8000000000000`), ignoring the tag argument as observed in the console's `libc.prx` (both exports load a global constant via `mov rax,[rip+..]; vmovsd xmm0,[rax]; ret`); VLC (PPSA85300) stops on nanf at start-up after strsep.
 - [Draw input snapshots](../../core/libs/prx/libSceAgcDriver/Graphics/src/ShaderResources.cpp) (libSceAgcDriver): `PrepareDrawBindings` caps read-only input buffer snapshots at 64 MiB (overridable via `APS5_DRAW_SNAPSHOT_MAX_MIB`). Larger inputs (streaming heaps, bindless pools) or draws exceeding the cumulative budget skip the per-draw snapshot and bind in place, avoiding multi-gigabyte CPU copy stalls (such as Ratchet & Clank: Rift Apart PPSA01474 stalling at frame ~380 copying 36 GB every 5 s). If the title rewrites those large ranges on the CPU before GPU completion, the in-place binding observes the modification, as verified by `drawSnapshotCapTests`.
-- [pthread_attr_getinheritsched, pthread_attr_setinheritsched, pthread_attr_getscope, pthread_attr_setscope](../../core/libs/prx/libkernel/Pthread/Posix/Attr.cpp) (libkernel) follow FreeBSD 11 libthr ([thr_attr.c](https://github.com/freebsd/freebsd-src/blob/5ed7eb0d97ba4436218e810f61bd059acba984c2/lib/libthr/thread/thr_attr.c), [thr_create.c](https://github.com/freebsd/freebsd-src/blob/5ed7eb0d97ba4436218e810f61bd059acba984c2/lib/libthr/thread/thr_create.c)), not measured on the console: the scope defaults to `PTHREAD_SCOPE_SYSTEM` (2), only it and `PTHREAD_SCOPE_PROCESS` (0) are accepted and other values return `EINVAL`, and an inherit value other than `PTHREAD_INHERIT_SCHED` (4) or `PTHREAD_EXPLICIT_SCHED` (0) returns `ENOTSUP`. A null output of `pthread_attr_getinheritsched` throws, since libthr writes through it unchecked. A thread keeps the scope it was created with, taken from the creating thread under `PTHREAD_INHERIT_SCHED`, and `pthread_attr_get_np` and `scePthreadAttrGet` report it, but every guest thread is a host thread at system scope, so process scope changes nothing
+- [pthread_attr_getinheritsched, pthread_attr_setinheritsched, pthread_attr_getscope, pthread_attr_setscope, pthread_attr_getstackaddr](../../core/libs/prx/libkernel/Pthread/Posix/Attr.cpp) (libkernel) follow FreeBSD 11 libthr ([thr_attr.c](https://github.com/freebsd/freebsd-src/blob/5ed7eb0d97ba4436218e810f61bd059acba984c2/lib/libthr/thread/thr_attr.c), [thr_create.c](https://github.com/freebsd/freebsd-src/blob/5ed7eb0d97ba4436218e810f61bd059acba984c2/lib/libthr/thread/thr_create.c)), not measured on the console: the scope defaults to `PTHREAD_SCOPE_SYSTEM` (2), only it and `PTHREAD_SCOPE_PROCESS` (0) are accepted and other values return `EINVAL`, and an inherit value other than `PTHREAD_INHERIT_SCHED` (4) or `PTHREAD_EXPLICIT_SCHED` (0) returns `ENOTSUP`. `pthread_attr_getstackaddr` returns the configured stack address pointer (null by default). A null output of `pthread_attr_getinheritsched` throws, since libthr writes through it unchecked. A thread keeps the scope it was created with, taken from the creating thread under `PTHREAD_INHERIT_SCHED`, and `pthread_attr_get_np` and `scePthreadAttrGet` report it, but every guest thread is a host thread at system scope, so process scope changes nothing
 - [SPIRV-Tools optimization](../../core/shader/recompiler/SpirvBackend/src/SpirvOptimizer.cpp) skips CCP and Simplification for modules with storage-only 8- or 16-bit types because the pinned folder produces illegal narrow constants. This also disables unrelated constant folding; the restricted full pipeline mirrors the pinned performance recipe.
 - [SRT signed comparison](../../core/shader/recompiler/Optimization/src/SrtWalker/SrtEvaluator.cpp) evaluates `SLessThan32` as signed 32-bit less-than, matching the existing SPIR-V backend and [SPIR-V `OpSLessThan`](https://registry.khronos.org/SPIR-V/specs/unified1/SPIRV.html#OpSLessThan). Signed boundary descriptor expressions are tested on the host; native RDNA2/PS5 execution and title behavior remain unverified.
 - On macOS the [write watch](../../core/libs/prx/libc/src/GuestWriteWatch.cpp) write-protects watched pages and records the first write to each from a SIGBUS/SIGSEGV handler, because macOS has no counterpart to `userfaultfd` write-protect or `MEM_WRITE_WATCH`. The protection is real, so: