[draft] libmicrokit: API for 64-bit number debug print

libmicrokit/include/microkit.h

@@ -91,6 +91,21 @@ void microkit_dbg_put8(seL4_Uint8 x);
  */
 void microkit_dbg_put32(seL4_Uint32 x);
 
+/*
+ * Output the decimal representation of an 64-bit integer to the debug console.
+ */
+void microkit_dbg_put64(seL4_Uint64 x);
+
+/*
+ * Output the hexadecimal representation of an 32-bit integer to the debug console.
+ */
+void microkit_dbg_puthex32(seL4_Uint32 x);
+
+/*
+ * Output the hexadecimal representation of an 64-bit integer to the debug console.
+ */
+void microkit_dbg_puthex64(seL4_Uint64 x);
+
 static inline void microkit_internal_crash(seL4_Error err)
 {
     /*

libmicrokit/src/dbg.c

@@ -52,6 +52,50 @@ void microkit_dbg_put32(seL4_Uint32 x)
     microkit_dbg_puts(&tmp[i]);
 }
 
+void microkit_dbg_put64(seL4_Uint64 x)
+{
+    char tmp[21];
+    unsigned i = 20;
+    tmp[20] = 0;
+    do {
+        seL4_Uint8 c = x % 10;
+        tmp[--i] = '0' + c;
+        x /= 10;
+    } while (x);
+    microkit_dbg_puts(&tmp[i]);
+}
+
+static char hexchar(unsigned int v)
+{
+    return v < 10 ? '0' + v : ('a' - 10) + v;
+}
+
+void microkit_dbg_puthex32(seL4_Uint32 val)
+{
+    char buffer[8 + 3];
+    buffer[0] = '0';
+    buffer[1] = 'x';
+    buffer[8 + 3 - 1] = 0;
+    for (unsigned i = 8 + 1; i > 1; i--) {
+        buffer[i] = hexchar(val & 0xf);
+        val >>= 4;
+    }
+    microkit_dbg_puts(buffer);
+}
+
+void microkit_dbg_puthex64(seL4_Uint64 val)
+{
+    char buffer[16 + 3];
+    buffer[0] = '0';
+    buffer[1] = 'x';
+    buffer[16 + 3 - 1] = 0;
+    for (unsigned i = 16 + 1; i > 1; i--) {
+        buffer[i] = hexchar(val & 0xf);
+        val >>= 4;
+    }
+    microkit_dbg_puts(buffer);
+}
+
 /*
  * We have to provide an implementation for libsel4 debug asserts, make it
  * weak so users can override with their own libc etc.