[farosch]

What

Log the saved guest signal context before invoking a guest exception handler: signal number, RIP/RSP, flags, trap/error/fault fields, and general-purpose registers. Format into a fixed buffer and write directly to stderr, avoiding the normal logger in the POSIX signal-handler path. Debug-raise APIs now print exception codes in hex and include the caller address. These diagnostics do not change handler or termination behavior.

Tested

Linux x86-64: cmake --build build --target libs --parallel passed; no source errors reported. Manual runtime check produced:
[src/Exception.cpp:576 sceKernelDebugRaiseExceptionOnReleaseMode] ... c1=0xa0020004 c2=0x00000000 caller=...
The process still terminates on its existing SIGILL. The guest-register dump path was not exercised by that run because the unhandled host SIGILL bypasses guest exception dispatch. Windows not tested.

Checklist

• Based on current main; no other open PR implements the same functions
• One topic per PR; follow-ups go in a new PR
• No comments in code except technical debt
• Unimplemented paths throw (NotImplemented_nid_no_patch); silent stubs are listed under Silent stubs in their library's technical debt file
• No notes, investigation .md files or images added to the repository (attach them to this PR)
• New third-party code is a submodule built from source
• Generic behaviour, not specific to one title
• Depends on: none
• Fixes: none
• Unblocks: none
• GPUs tested: n/a
• AI-assisted: yes

[github-actions]

Other open pull requests touch the same code. Merging one will break the other, or both implement the same thing. If this one builds on them, list them in Depends on.

Pull request	Conflicting files (lines on main)	Same exports	Same new files
PR 7192	core/libs/prx/libkernel/System/src/Exception.cpp L125-128

Some comparisons could not be completed because a pull request conflicts with the base branch. Review these shared files manually before concluding that there is no overlap.

Pull request	Shared files not compared
PR 5021	core/libs/prx/libkernel/System/src/Exception.cpp
PR 6879	core/libs/prx/libkernel/System/src/Exception.cpp
PR 7201	core/libs/prx/libkernel/System/src/Exception.cpp
PR 7332	core/libs/prx/libkernel/System/src/Exception.cpp

[LeandroLP23]

Windows run, since the description covers Linux only. Radeon 860M (RDNA 3.5, driver 32.0.13058.8001), Windows 11 26300, WinLibs GCC 15.2.0 r7, Release, BUILD_TESTING=ON. Build: main e8ad642fe with #7651, #7650, #7647, #7655 and #7648 merged together (each merge clean, built once).

The build is clean. The existing guest exception tests pass 3 runs of 3: guest_raise_exception, guest_mutex_raise_exception, guest_raise_nested_sleep and windows_exceptions. I didn't check whether any of them reaches the new log line, so this covers the build and no regression in those paths.

AI-assisted

[adriadam10]

Checked the context dump: the fixed 768-byte buffer holds the longest line (~520 bytes), it only uses write/WriteFile (no allocation or logger in the signal path), the GuestMcontext fields exist, and handler behaviour is unchanged. Windows build confirmed by @LeandroLP23; merged.