svn commit: r228605 - head/sys/powerpc/aim

[Nathan Whitehorn]

Author: nwhitehorn
Date: Fri Dec 16 23:40:56 2011
New Revision: 228605
URL: http://svn.freebsd.org/changeset/base/228605

Log:
  Zero BSS on start, in case the ELF loader that started the kernel did not
  do this for us. This can happen on some embedded systems.
  
  Submitted by:	rpaulo

Modified:
  head/sys/powerpc/aim/locore32.S

Modified: head/sys/powerpc/aim/locore32.S
==============================================================================
--- head/sys/powerpc/aim/locore32.S	Fri Dec 16 23:15:11 2011	(r228604)
+++ head/sys/powerpc/aim/locore32.S	Fri Dec 16 23:40:56 2011	(r228605)
@@ -128,6 +128,17 @@ __start:
 	sync
 	isync
 
+	/* Zero bss, in case we were started by something unhelpful */
+	li	0,0
+	lis	8,_edata at ha
+	addi	8,8,_edata at l
+	lis	9,_end at ha
+	addi	9,9,_end at l
+2:	stw     0,0(8)
+	addi	8,8,4
+	cmplw	8,9
+	blt	2b
+	
 	/* Save the argument pointer and length */
 	mr	20,6
 	mr	21,7