[romprefix] Fix incorrect pointer offset in undiloader.S

Frediano Ziglio · mcb30 · commit 9df238a8aa1c · 2013-05-14T14:51:19.000+01:00
Commit 2422647 ("[prefix] Allow prefix to specify an arbitrary maximum address for relocation") introduced a regression into the UNDI ROM loader by preserving an extra register on the stack without modifying the %sp-relative addresses used in the routine. Fix by correcting the %sp-relative addresses to allow for the extra preserved variable. Signed-off-by: Frediano Ziglio <frediano.ziglio@citrix.com> Signed-off-by: Michael Brown <mcb30@ipxe.org>
diff --git a/src/arch/i386/prefix/undiloader.S b/src/arch/i386/prefix/undiloader.S
@@ -23,8 +23,8 @@ undiloader:
 	popw	%ds
 	/* UNDI loader parameter structure address into %es:%di */
 	movw	%sp, %bx
-	movw	%ss:18(%bx), %di
-	movw	%ss:20(%bx), %es
+	movw	%ss:22(%bx), %di
+	movw	%ss:24(%bx), %es
 	/* Install to specified real-mode addresses */
 	pushw	%di
 	movw	%es:12(%di), %bx
