feat: add process termination codes and SYS_ABORT; whole-process abort() from any thread in libc and montauk-rt

kernel/src/Hal/IDT.cpp

@@ -8,6 +8,7 @@
 
 #include <Memory/Heap.hpp>
 #include <Common/Panic.hpp>
+#include <Common/TerminationCodes.hpp>
 #include <Platform/Registers.hpp>
 #include <CppLib/Stream.hpp>
 #include <Memory/PageFrameAllocator.hpp>
@@ -170,23 +171,20 @@ namespace Hal {
             CrashReport::AddReport(rep);
             Sched::SpawnCrashPad(proc->pid);
 
-            // Record a killed-by-signal exit code (256+sig) so a parent
-            // blocked in SYS_WAITPID can tell a crash from a clean exit.
+            // Record a termination code (256+sig) so a parent blocked in
+            // SYS_WAITPID can tell a crash from a clean exit.
             {
-                int sig = 11;                       /* SIGSEGV */
-                if (i == 0x00) sig = 8;             /* #DE -> SIGFPE */
-                else if (i == 0x06) sig = 4;        /* #UD -> SIGILL */
-                else if (i == 0x10 || i == 0x13) sig = 8;  /* x87/SIMD FP */
+                int code = TerminationFromVector(i);
 
                 // ExitProcess from a sibling thread ends only that thread,
                 // which would leave the process running with the crash
                 // swallowed. Flag the whole process (main thread and every
                 // sibling) first, carrying the crash code rather than
-                // KillProcess's default SIGKILL, so waiters see the fault.
+                // KillProcess's default TerminatedKilled, so waiters see the fault.
                 if (Sched::GetCurrentThreadPtr() != proc) {
-                    Sched::KillProcess(proc->pid, 256 + sig);
+                    Sched::KillProcess(proc->pid, code);
                 } else {
-                    Sched::SetProcessExitCode(proc->pid, 256 + sig);
+                    Sched::SetProcessExitCode(proc->pid, code);
                 }
             }