From: H. Peter Anvin <hpa@zytor.com>
Date: Mon, 8 Jun 2009 00:06:59 +0000 (-0700)
Subject: memdisk: set up a limited-size real-mode stack
X-Git-Tag: syslinux-3.83-pre2~20
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0a4a533cc1c0e0c7e526f454d29b416bb580df0f;p=profile%2Fivi%2Fsyslinux.git

memdisk: set up a limited-size real-mode stack

Limit the size of the real-mode stack.  This should limit the amount
of memory needed for a relocated real-mode code.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
---

diff --git a/memdisk/memdisk16.asm b/memdisk/memdisk16.asm
index b020c70..e8e5d78 100644
--- a/memdisk/memdisk16.asm
+++ b/memdisk/memdisk16.asm
@@ -33,6 +33,9 @@ BOUNCE_SEG	equ (MY_CS+0x1000)
 		section .rodata align=16
 		section .data   align=16
 		section .bss    align=16
+		section .stack	align=16 nobits
+stack		resb 512
+stack_end	equ $
 
 ;; -----------------------------------------------------------------------
 ;;  Kernel image header
@@ -107,7 +110,7 @@ start:
 		rep movsd
 		mov ds,ax
 		mov ss,ax
-		xor esp,esp		; Stack at top of 64K segment
+		mov esp,stack_end
 		jmp MY_CS:.next
 .next: