From fd1c5a50bb35f772b8e37125188640447d4b3b2a Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Wed, 25 Mar 2026 13:24:03 +0100
Subject: kapi/cpu: enable formatting of exception types

---
 kapi/include/kapi/cpu/exception.hpp | 36 ++++++++++++++++++++++++++++++++++++
 kernel/src/cpu.cpp                  |  3 +--
 2 files changed, 37 insertions(+), 2 deletions(-)

diff --git a/kapi/include/kapi/cpu/exception.hpp b/kapi/include/kapi/cpu/exception.hpp
index 9fc697a..00b02e7 100644
--- a/kapi/include/kapi/cpu/exception.hpp
+++ b/kapi/include/kapi/cpu/exception.hpp
@@ -5,6 +5,8 @@
 
 #include "kapi/memory.hpp"
 
+#include <kstd/format>
+
 #include <cstdint>
 
 namespace kapi::cpu
@@ -82,4 +84,38 @@ namespace kapi::cpu
 
 }  // namespace kapi::cpu
 
+template<>
+struct kstd::formatter<enum kapi::cpu::exception::type>
+{
+  constexpr auto parse(kstd::format_parse_context & ctx) -> decltype(ctx.begin())
+  {
+    return ctx.begin();
+  }
+
+  constexpr auto format(enum kapi::cpu::exception::type type, kstd::format_context & ctx) const -> void
+  {
+    switch (type)
+    {
+      case kapi::cpu::exception::type::unknown:
+        return ctx.push("unknown");
+      case kapi::cpu::exception::type::page_fault:
+        return ctx.push("page fault");
+      case kapi::cpu::exception::type::alignment_fault:
+        return ctx.push("alignment fault");
+      case kapi::cpu::exception::type::memory_access_fault:
+        return ctx.push("memory access fault");
+      case kapi::cpu::exception::type::illegal_instruction:
+        return ctx.push("illegal instruction");
+      case kapi::cpu::exception::type::privilege_violation:
+        return ctx.push("privilege violation");
+      case kapi::cpu::exception::type::arithmetic_error:
+        return ctx.push("arithmetic error");
+      case kapi::cpu::exception::type::breakpoint:
+        return ctx.push("breakpoint");
+      case kapi::cpu::exception::type::single_step:
+        return ctx.push("single step");
+    }
+  }
+};
+
 #endif
\ No newline at end of file
diff --git a/kernel/src/cpu.cpp b/kernel/src/cpu.cpp
index fc460c9..11b6551 100644
--- a/kernel/src/cpu.cpp
+++ b/kernel/src/cpu.cpp
@@ -14,6 +14,7 @@ namespace kernel::cpu
     {
       auto handle(kapi::cpu::exception const & context) -> bool override
       {
+        kstd::println(kstd::print_sink::stderr, "[OS:CPU] {} @ {:#018x}", context.type, context.instruction_pointer);
         switch (context.type)
         {
           case kapi::cpu::exception::type::page_fault:
@@ -26,12 +27,10 @@ namespace kernel::cpu
     private:
       auto handle_page_fault(kapi::cpu::exception const & context) -> bool
       {
-        kstd::println(kstd::print_sink::stderr, "[OS:CPU] PAGE FAULT!");
         kstd::println(kstd::print_sink::stderr, "\tFault address: {:#018x}", context.access_address);
         kstd::println(kstd::print_sink::stderr, "\tPresent: {}", context.is_present);
         kstd::println(kstd::print_sink::stderr, "\tWrite: {}", context.is_write_access);
         kstd::println(kstd::print_sink::stderr, "\tUser: {}", context.is_user_mode);
-        kstd::println(kstd::print_sink::stderr, "\tRIP: {:#018x}", context.instruction_pointer);
 
         kapi::system::panic("Halting the system due to an unrecoverable page fault.");
       }
-- 
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