Kernel: Send more specific signals when crashing due to CPU exceptions.

- For division by zero, send SIGFPE.
- For illegal instruction, send SIGILL.
- For the rest, default to SIGSEGV.

3 files changed, 17 insertions, 9 deletions

diff --git a/Kernel/Process.cpp b/Kernel/Process.cpp
index 4725c3bf52..6764b6e611 100644
--- a/Kernel/Process.cpp
+++ b/Kernel/Process.cpp
@@ -720,14 +720,14 @@ void Process::sys$sigreturn()
     ASSERT_NOT_REACHED();
 }
 
-void Process::crash()
+void Process::crash(int signal)
 {
     ASSERT_INTERRUPTS_DISABLED();
     ASSERT(!is_dead());
 
     dump_backtrace();
 
-    m_termination_signal = SIGSEGV;
+    m_termination_signal = signal;
     dump_regions();
     ASSERT(is_ring3());
     die();
diff --git a/Kernel/Process.h b/Kernel/Process.h
index ff3d4e5e5c..328cb3a788 100644
--- a/Kernel/Process.h
+++ b/Kernel/Process.h
@@ -13,6 +13,7 @@
 #include <Kernel/UnixTypes.h>
 #include <Kernel/Thread.h>
 #include <Kernel/Lock.h>
+#include <LibC/signal_numbers.h>
 
 class ELFLoader;
 class FileDescriptor;
@@ -191,7 +192,7 @@ public:
 
     static void initialize();
 
-    [[noreturn]] void crash();
+    [[noreturn]] void crash(int signal = SIGSEGV);
     [[nodiscard]] static int reap(Process&);
 
     const TTY* tty() const { return m_tty; }
diff --git a/Kernel/i386.cpp b/Kernel/i386.cpp
index 1409da2c43..2a660cf55a 100644
--- a/Kernel/i386.cpp
+++ b/Kernel/i386.cpp
@@ -167,19 +167,22 @@ void exception_6_handler(RegisterDump& regs)
         kprintf("#UD with !current\n");
         hang();
     }
-    kprintf("%s invalid opcode: %u(%s)\n", current->process().is_ring0() ? "Kernel" : "Process", current->pid(), current->process().name().characters());
 
-    dump(regs);
+    kprintf("%s Illegal instruction: %s(%u)\n",
+        current->process().is_ring0() ? "Kernel" : "Process",
+        current->process().name().characters(),
+        current->pid()
+    );
 
+    dump(regs);
     dump_backtrace();
 
     if (current->process().is_ring0()) {
         kprintf("Oh shit, we've crashed in ring 0 :(\n");
         hang();
     }
-    hang();
 
-    current->process().crash();
+    current->process().crash(SIGILL);
 }
 
 // 7: FPU not available exception
@@ -216,7 +219,11 @@ void exception_7_handler(RegisterDump& regs)
 EH_ENTRY_NO_CODE(0);
 void exception_0_handler(RegisterDump& regs)
 {
-    kprintf("%s DIVIDE ERROR: %u(%s)\n", current->process().is_ring0() ? "Kernel" : "User", current->pid(), current->process().name().characters());
+    kprintf("%s Division by zero: %s(%u)\n",
+        current->process().is_ring0() ? "Kernel" : "User",
+        current->process().name().characters(),
+        current->pid()
+    );
 
     dump(regs);
 
@@ -225,7 +232,7 @@ void exception_0_handler(RegisterDump& regs)
         hang();
     }
 
-    current->process().crash();
+    current->process().crash(SIGFPE);
 }