openssl: add ppc64 support

Backport an upstream patch that adds support for ELFv2 ABI on big endian
ppc64. As musl only supports ELFv2 ABI on ppc64 regardless of
endianness, this is required to be able to build OpenSSL for ppc64be.

Modify our targets patch to add linux-powerpc64-openwrt, which will use
the linux64v2 perlasm scheme. This will probably break the combination
ppc64 with glibc, but as we really only want to support musl, this
shouldn't be a problem.

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
Acked-by: Rui Salvaterra <rsalvaterra@gmail.com>

package/libs/openssl/Makefile

@@ -11,7 +11,7 @@ PKG_NAME:=openssl
 PKG_BASE:=1.1.1
 PKG_BUGFIX:=l
 PKG_VERSION:=$(PKG_BASE)$(PKG_BUGFIX)
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_USE_MIPS16:=0
 ENGINES_DIR=engines-1.1
 

package/libs/openssl/patches/001-crypto-perlasm-ppc-xlate.pl-add-linux64v2-flavour.patch

@@ -0,0 +1,63 @@
+From 34ab13b7d8e3e723adb60be8142e38b7c9cd382a Mon Sep 17 00:00:00 2001
+From: Andy Polyakov <appro@openssl.org>
+Date: Sun, 5 May 2019 18:25:50 +0200
+Subject: [PATCH] crypto/perlasm/ppc-xlate.pl: add linux64v2 flavour
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This is a big endian ELFv2 configuration. ELFv2 was already being
+used for little endian, and big endian was traditionally ELFv1
+but there are practical configurations that use ELFv2 with big
+endian nowadays (Adélie Linux, Void Linux, possibly Gentoo, etc.)
+
+Reviewed-by: Paul Dale <paul.dale@oracle.com>
+Reviewed-by: Richard Levitte <levitte@openssl.org>
+(Merged from https://github.com/openssl/openssl/pull/8883)
+---
+ crypto/perlasm/ppc-xlate.pl | 8 ++++----
+ 1 file changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/crypto/perlasm/ppc-xlate.pl b/crypto/perlasm/ppc-xlate.pl
+index e52f2f6ea6..5fcd0526df 100755
+--- a/crypto/perlasm/ppc-xlate.pl
++++ b/crypto/perlasm/ppc-xlate.pl
+@@ -49,7 +49,7 @@ my $globl = sub {
+ 	/osx/		&& do { $name = "_$name";
+ 				last;
+ 			      };
+-	/linux.*(32|64le)/
++	/linux.*(32|64(le|v2))/
+ 			&& do {	$ret .= ".globl	$name";
+ 				if (!$$type) {
+ 				    $ret .= "\n.type	$name,\@function";
+@@ -80,7 +80,7 @@ my $globl = sub {
+ };
+ my $text = sub {
+     my $ret = ($flavour =~ /aix/) ? ".csect\t.text[PR],7" : ".text";
+-    $ret = ".abiversion	2\n".$ret	if ($flavour =~ /linux.*64le/);
++    $ret = ".abiversion	2\n".$ret	if ($flavour =~ /linux.*64(le|v2)/);
+     $ret;
+ };
+ my $machine = sub {
+@@ -186,7 +186,7 @@ my $vmr = sub {
+ 
+ # Some ABIs specify vrsave, special-purpose register #256, as reserved
+ # for system use.
+-my $no_vrsave = ($flavour =~ /aix|linux64le/);
++my $no_vrsave = ($flavour =~ /aix|linux64(le|v2)/);
+ my $mtspr = sub {
+     my ($f,$idx,$ra) = @_;
+     if ($idx == 256 && $no_vrsave) {
+@@ -320,7 +320,7 @@ while($line=<>) {
+ 	if ($label) {
+ 	    my $xlated = ($GLOBALS{$label} or $label);
+ 	    print "$xlated:";
+-	    if ($flavour =~ /linux.*64le/) {
++	    if ($flavour =~ /linux.*64(le|v2)/) {
+ 		if ($TYPES{$label} =~ /function/) {
+ 		    printf "\n.localentry	%s,0\n",$xlated;
+ 		}
+-- 
+2.31.1
+

package/libs/openssl/patches/110-openwrt_targets.patch

@@ -12,7 +12,7 @@ new file mode 100644
 index 0000000000..86a86d31e4
 --- /dev/null
 +++ b/Configurations/25-openwrt.conf
-@@ -0,0 +1,48 @@
+@@ -0,0 +1,52 @@
 +## Openwrt "CONFIG_ARCH" matching targets.
 +
 +# The targets need to end in '-openwrt' for the AFALG patch to work
@@ -52,6 +52,10 @@ index 0000000000..86a86d31e4
 +    "linux-powerpc-openwrt" => {
 +        inherit_from    => [ "linux-ppc", "openwrt" ],
 +    },
++    "linux-powerpc64-openwrt" => {
++        inherit_from    => [ "linux-ppc64", "openwrt" ],
++        perlasm_scheme  => "linux64v2",
++    },
 +    "linux-x86_64-openwrt" => {
 +        inherit_from    => [ "linux-x86_64", "openwrt" ],
 +    },