[panic.serial] Add location to panic data

Updated kassert to be an actual function, and used the __builtin_*
functions for location data. Updated the panic handler protocol to
include sending location data as three more parameters. Updated the
serial panic handler to display that data along with the (optional)
message.

src/libraries/kutil/include/kutil/assert.h

@@ -16,14 +16,29 @@ extern uintptr_t symbol_table;
 } // namespace assert
 } // namespace kutil
 
-#define kassert(stmt, message)  \
-    do { \
-        if(!(stmt)) { \
-            register const char *m asm("rdi"); \
-            register uintptr_t i asm("rsi"); \
-            asm volatile ("mov %1, %0" : "=r"(m) : "r"(message)); \
-            asm volatile ("mov %1, %0" : "=r"(i) : "r"(kutil::assert::symbol_table)); \
-            *kutil::assert::apic_icr = kutil::assert::send_nmi_command; \
-            while (1) __asm__ __volatile__ ("hlt"); \
-        } \
-    } while(0);
+__attribute__ ((always_inline))
+inline void kassert(
+        bool check,
+        const char *message = nullptr,
+        const char *function = __builtin_FUNCTION(),
+        const char *file = __builtin_FILE(),
+        uint64_t line = __builtin_LINE())
+{
+    if (!check) {
+        register uintptr_t syms asm("rdi");
+        register const char *m asm("rsi");
+        register const char *fn asm("rdx");
+        register const char *fi asm("rcx");
+        register uint64_t l asm("r8");
+
+        asm volatile ("mov %1, %0" : "=r"(syms) : "r"(kutil::assert::symbol_table));
+        asm volatile ("mov %1, %0" : "=r"(m) : "r"(message));
+        asm volatile ("mov %1, %0" : "=r"(fn) : "r"(function));
+        asm volatile ("mov %1, %0" : "=r"(fi) : "r"(file));
+        asm volatile ("mov %1, %0" : "=r"(l) : "r"(line));
+
+        *kutil::assert::apic_icr = kutil::assert::send_nmi_command;
+
+        while (1) asm ("hlt");
+    }
+}