console: Make die() and friends variadic

die() currently only accepts a fixed message string, which is rather
inconvenient when there is extra information that would be helpful to
print in the error message. This currently requires an extra call to
printk(), which is somewhat awkward:

    printk(BIOS_EMERG, "Bad table, opcode %d at %d", id, i);
    die("");	// what do I say here?

die() already has a printk() inside it to print the error message, so
let's just make it variadic to combine the two.

    die("Bad table, opcode %d at %d", id, i);	// much better

Forwarding variadic arguments from one function to another is rather
tricky, so die_with_post_code() is redefined as a variadic macro
instead.

Change-Id: I28b9eac32899a1aa89e086e0d3889b75459581aa
Signed-off-by: Jacob Garber <jgarber1@ualberta.ca>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33153
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Keith Short <keithshort@chromium.org>

src/console/die.c

@@ -30,17 +30,15 @@ __weak void die_notify(void)
 }
 
 /* Report a fatal error */
-void __noreturn die(const char *msg)
+void __noreturn die(const char *fmt, ...)
 {
-	printk(BIOS_EMERG, "%s", msg);
+	va_list args;
+
+	va_start(args, fmt);
+	vprintk(BIOS_EMERG, fmt, args);
+	va_end(args);
+
 	die_notify();
 	halt();
 }
-
-/* Report a fatal error with a post code */
-void __noreturn die_with_post_code(uint8_t value, const char *msg)
-{
-	post_code(value);
-	die(msg);
-}
 #endif

src/include/console/console.h

@@ -42,8 +42,9 @@ void post_log_clear(void);
 #endif
 /* this function is weak and can be overridden by a mainboard function. */
 void mainboard_post(u8 value);
-void __noreturn die(const char *msg);
+void __noreturn die(const char *fmt, ...);
-void __noreturn die_with_post_code(uint8_t value, const char *msg);
+#define die_with_post_code(value, fmt, ...) \
+	do { post_code(value); die(fmt, ##__VA_ARGS__); } while (0)
 
 /*
  * This function is weak and can be overridden to provide additional