[src/trunk]: src/sys/arch/aarch64 Fix alignment of .text section by changing ...

[jmcneill <jmcneill%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/fc2b59fb3181
branches:  trunk
changeset: 465804:fc2b59fb3181
user:      jmcneill <jmcneill%NetBSD.org@localhost>
date:      Wed Dec 04 11:24:31 2019 +0000

description:
Fix alignment of .text section by changing load address to
0xffffffc000000000 and adding 64 bytes of padding before the entry point.

diffstat:

 sys/arch/aarch64/aarch64/start.S       |  9 +++++++--
 sys/arch/aarch64/conf/Makefile.aarch64 |  4 ++--
 2 files changed, 9 insertions(+), 4 deletions(-)

diffs (48 lines):

diff -r 817bb9446b23 -r fc2b59fb3181 sys/arch/aarch64/aarch64/start.S
--- a/sys/arch/aarch64/aarch64/start.S  Wed Dec 04 11:21:34 2019 +0000
+++ b/sys/arch/aarch64/aarch64/start.S  Wed Dec 04 11:24:31 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: start.S,v 1.2 2018/10/18 09:01:51 skrll Exp $  */
+/*     $NetBSD: start.S,v 1.3 2019/12/04 11:24:31 jmcneill Exp $       */
 
 /*
  * Copyright (c) 2017 Ryo Shimizu <ryo%nerv.org@localhost>
@@ -32,7 +32,7 @@
 
 #include <aarch64/asm.h>
 
-RCSID("$NetBSD: start.S,v 1.2 2018/10/18 09:01:51 skrll Exp $")
+RCSID("$NetBSD: start.S,v 1.3 2019/12/04 11:24:31 jmcneill Exp $")
 
 /* load far effective address (pc relative) */
 .macro ADDR, reg, addr
@@ -41,6 +41,11 @@
 .endm
 
 /*
+ * Padding at start of kernel image to make room for 64-byte header (non-ELF booting)
+ */
+.space 64, 0x0
+
+/*
  * Kernel start routine for aarch64 boards.
  */
        .global start
diff -r 817bb9446b23 -r fc2b59fb3181 sys/arch/aarch64/conf/Makefile.aarch64
--- a/sys/arch/aarch64/conf/Makefile.aarch64    Wed Dec 04 11:21:34 2019 +0000
+++ b/sys/arch/aarch64/conf/Makefile.aarch64    Wed Dec 04 11:24:31 2019 +0000
@@ -1,4 +1,4 @@
-#      $NetBSD: Makefile.aarch64,v 1.15 2019/03/03 07:04:40 maxv Exp $
+#      $NetBSD: Makefile.aarch64,v 1.16 2019/12/04 11:24:31 jmcneill Exp $
 
 # Makefile for NetBSD
 #
@@ -74,7 +74,7 @@
 ## (5) link settings
 ##
 KERNLDSCRIPT?= ${ARM}/conf/kern.ldscript
-LOADADDRESS?=  0xffffffc000000040
+LOADADDRESS?=  0xffffffc000000000
 LINKFLAGS_NORMAL=      -X
 
 # Strip AArch64 mapping symbols from the kernel image, as they interfere