[commit] r1328 - trunk/openbios-devel/forth/device

[repository service]

Author: mcayland
Date: Mon Dec  1 21:52:15 2014
New Revision: 1328
URL: http://tracker.coreboot.org/trac/openbios/changeset/1328

Log:
package.fs: fix "child" word being called with a NULL phandle

Solaris 9 relies on an undocumented feature that calling "child" with
a NULL phandle is equivalent to using the phandle of the device tree
root node.

Make sure that we emulate the same behaviour to avoid a crash when
dereferencing a NULL pointer.

This patch fixes Solaris 9 boot on SPARC32 and is based upon a
proof-of-concept patch submitted by Artyom Tarasenko <atar4qemu(a)gmail.com>om>.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland(a)ilande.co.uk>

Modified:
   trunk/openbios-devel/forth/device/package.fs

Modified: trunk/openbios-devel/forth/device/package.fs
==============================================================================
--- trunk/openbios-devel/forth/device/package.fs	Fri Nov 14 20:17:48 2014	(r1327)
+++ trunk/openbios-devel/forth/device/package.fs	Mon Dec  1 21:52:15 2014	(r1328)
@@ -49,6 +49,10 @@
 ;
 
 : child ( phandle.parent -- phandle.child )
+  \ Assume phandle == 0 indicates root node (not documented but similar
+  \ behaviour to "peer"). Used by some versions of Solaris (e.g. 9).
+  ?dup if else device-tree @ then
+
 dn.child @
 ;