Complete (almost!) printf fmt support

[lunaix-os.git] / lunaix-os / kernel / spike.c

diff --git a/lunaix-os/kernel/spike.c b/lunaix-os/kernel/spike.c
new file mode 100644 (file)
index 0000000..91f597d
--- /dev/null
+++ b/lunaix-os/kernel/spike.c
@@ -0,0 +1,19 @@
+#include <lunaix/spike.h>
+#include <arch/x86/interrupts.h>
+#include <libc/stdio.h>
+
+static char buffer[1024];
+
+void __assert_fail(const char* expr, const char* file, unsigned int line) {
+    sprintf(buffer, "Assert %s failed (%s:%u)", expr, file, line);
+
+    // Here we load the buffer's address into %edi ("D" constraint)
+    //  This is a convention we made that the LUNAIX_SYS_PANIC syscall will
+    //  print the panic message passed via %edi. (see kernel/asm/x86/interrupts.c)
+    asm(
+        "int %0"
+        ::"i"(LUNAIX_SYS_PANIC), "D"(buffer)
+    );
+
+    spin();     // never reach
+}
\ No newline at end of file