Fix invalid double-use of the edx register in parse_dhcp_options

diff --git a/pxelinux.asm b/pxelinux.asm
index 802118b..fdc5780 100644 (file)
--- a/pxelinux.asm
+++ b/pxelinux.asm
@@ -2149,15 +2149,15 @@ parse_some_dhcp_options:
 
                cmp dl,1        ; SUBNET MASK option
                jne .not_subnet
-               mov edx,[si]
-               mov [Netmask],edx
+               mov ebx,[si]
+               mov [Netmask],ebx
                jmp .opt_done
 .not_subnet:
 
                cmp dl,3        ; ROUTER option
                jne .not_router
-               mov edx,[si]
-               mov [Gateway],edx
+               mov ebx,[si]
+               mov [Gateway],ebx
                jmp .opt_done
 .not_router:
 
@@ -2173,8 +2173,8 @@ parse_some_dhcp_options:
 
                cmp dl,52       ; OPTION OVERLOAD option
                jne .not_overload
-               mov dl,[si]
-               mov [OverLoad],dl
+               mov bl,[si]
+               mov [OverLoad],bl
                jmp .opt_done
 .not_overload:
 
@@ -2214,11 +2214,11 @@ parse_some_dhcp_options:
                jne .not_pl_timeout
                cmp al,4
                jne .opt_done
-               mov edx,[si]
-               xchg dl,dh      ; Convert to host byte order
-               rol edx,16
-               xchg dl,dh
-               mov [RebootTime],edx
+               mov ebx,[si]
+               xchg bl,bh      ; Convert to host byte order
+               rol ebx,16
+               xchg bl,bh
+               mov [RebootTime],ebx
                or byte [DHCPMagic], byte 8     ; Got RebootTime
                ; jmp short .opt_done
 .not_pl_timeout: