From 4420a1bc0b335221680346af6ad7082ff2fd0273 Mon Sep 17 00:00:00 2001
From: "H. Peter Anvin" <hpa@zytor.com>
Date: Sun, 17 Mar 2013 18:08:13 -0700
Subject: printmsg.asm: add support for 2-digit hex debug messages

---
 printmsg.asm | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

(limited to 'printmsg.asm')

diff --git a/printmsg.asm b/printmsg.asm
index 516b5e2..231f568 100644
--- a/printmsg.asm
+++ b/printmsg.asm
@@ -250,21 +250,33 @@ GPROC(debug_printnum)
 END(debug_printnum)
 
 /* ------------------------------------------------------------------------- *
- *  debug_printhex4
+ *  debug_printhex2/4
  *
- *  Print an hexadecimal 4-digit number from the stack
+ *  Print an hexadecimal 2/4-digit number from the stack
  * ------------------------------------------------------------------------- */
 
+GPROC(debug_printhex2)
+	pushw %cx
+	movw $0x208,%cx
+	jmp debug_printhexn
+END(debug_printhex2)
+
 GPROC(debug_printhex4)
-	pushw %ax
 	pushw %cx
+	movw $0x400,%cx
+	/* jmp debug_printhexn */
+END(debug_printhex4)
+	
+LPROC(debug_printhexn)
+	pushw %ax
 	pushw %dx
 	pushw %di
 	cld
 	subw $6,%sp
 	movw %sp,%di
 	movw (2+4*2+6)(%di),%dx
-	movw $4,%cx
+	shlw %cl,%dx
+	shrw $8,%cx
 1:
 	rolw $4,%dx
 	movb %dl,%al
@@ -283,10 +295,10 @@ GPROC(debug_printhex4)
 	addw $6,%sp
 	popw %di
 	popw %dx
-	popw %cx
 	popw %ax
+	popw %cx
 	retw $2
-END(debug_printhex4)
+END(debug_printhexn)
 
 /* ------------------------------------------------------------------------- *
  *  debug_printhex8
-- 
cgit