svn commit: r361500 - head/sys/amd64/amd64

[Roger Pau Monné]

Author: royger
Date: Tue May 26 10:24:06 2020
New Revision: 361500
URL: https://svnweb.freebsd.org/changeset/base/361500

Log:
  xen-locore: fix size in GDT descriptor
  
  There was an off-by-one in the GDT descriptor size field used by the
  early Xen boot code. The GDT descriptor size should be the size of the
  GDT minus one. No functional change expected as a result of this
  change.
  
  Sponsored by:	Citrix Systems R&D

Modified:
  head/sys/amd64/amd64/xen-locore.S

Modified: head/sys/amd64/amd64/xen-locore.S
==============================================================================
--- head/sys/amd64/amd64/xen-locore.S	Tue May 26 08:25:24 2020	(r361499)
+++ head/sys/amd64/amd64/xen-locore.S	Tue May 26 10:24:06 2020	(r361500)
@@ -207,7 +207,7 @@ PT2:
 
 /* 64bit GDT */
 gdtdesc:
-	.word	gdtend - gdt
+	.word	gdtend - gdt - 1
 	.long	VTOP(gdt)		# low
 	.long	0			# high
 gdt:
@@ -221,7 +221,7 @@ gdtend:
 
 /* 32bit GDT */
 gdtdesc32:
-	.word	gdt32end - gdt32
+	.word	gdt32end - gdt32 - 1
 	.long	VTOP(gdt32)
 	.long	0
 gdt32: