generic: backport PPC boot wrapper VDSO executable stack fix

Backport upstream fix for PowerPC that fix VDSO executable stack warning
for the boot wrapper.

Fix the compilation error:
powerpc-openwrt-linux-musl-ld.bin: warning: div64.o: missing .note.GNU-stack section implies executable stack
powerpc-openwrt-linux-musl-ld.bin: NOTE: This behaviour is deprecated and will be removed in a future version of the linker
powerpc-openwrt-linux-musl-ld.bin: warning: arch/powerpc/boot/simpleImage.ws-ap3825i has a LOAD segment with RWX permissions

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

2 files changed, 126 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.15/303-v6.2-powerpc-suppress-some-linker-warnings-in-recent-link.patch b/target/linux/generic/backport-5.15/303-v6.2-powerpc-suppress-some-linker-warnings-in-recent-link.patch
new file mode 100644
index 0000000000..7c1507bba7
--- /dev/null
+++ b/target/linux/generic/backport-5.15/303-v6.2-powerpc-suppress-some-linker-warnings-in-recent-link.patch
@@ -0,0 +1,63 @@
+From 579aee9fc594af94c242068c011b0233563d4bbf Mon Sep 17 00:00:00 2001
+From: Stephen Rothwell <sfr@canb.auug.org.au>
+Date: Mon, 10 Oct 2022 16:57:21 +1100
+Subject: [PATCH] powerpc: suppress some linker warnings in recent linker
+ versions
+
+This is a follow on from commit
+
+  0d362be5b142 ("Makefile: link with -z noexecstack --no-warn-rwx-segments")
+
+for arch/powerpc/boot to address wanrings like:
+
+  ld: warning: opal-calls.o: missing .note.GNU-stack section implies executable stack
+  ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker
+  ld: warning: arch/powerpc/boot/zImage.epapr has a LOAD segment with RWX permissions
+
+This fixes issue https://github.com/linuxppc/issues/issues/417
+
+Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
+Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
+Link: https://lore.kernel.org/r/20221010165721.106267e6@canb.auug.org.au
+---
+ arch/powerpc/boot/wrapper | 15 ++++++++++++++-
+ 1 file changed, 14 insertions(+), 1 deletion(-)
+
+--- a/arch/powerpc/boot/wrapper
++++ b/arch/powerpc/boot/wrapper
+@@ -213,6 +213,11 @@ ld_version()
+     }'
+ }
+ 
++ld_is_lld()
++{
++	${CROSS}ld -V 2>&1 | grep -q LLD
++}
++
+ # Do not include PT_INTERP segment when linking pie. Non-pie linking
+ # just ignores this option.
+ LD_VERSION=$(${CROSS}ld --version | ld_version)
+@@ -221,6 +226,14 @@ if [ "$LD_VERSION" -ge "$LD_NO_DL_MIN_VE
+ 	nodl="--no-dynamic-linker"
+ fi
+ 
++# suppress some warnings in recent ld versions
++nowarn="-z noexecstack"
++if ! ld_is_lld; then
++	if [ "$LD_VERSION" -ge "$(echo 2.39 | ld_version)" ]; then
++		nowarn="$nowarn --no-warn-rwx-segments"
++	fi
++fi
++
+ platformo=$object/"$platform".o
+ lds=$object/zImage.lds
+ ext=strip
+@@ -502,7 +515,7 @@ if [ "$platform" != "miboot" ]; then
+         text_start="-Ttext $link_address"
+     fi
+ #link everything
+-    ${CROSS}ld -m $format -T $lds $text_start $pie $nodl $rodynamic $notext -o "$ofile" $map \
++    ${CROSS}ld -m $format -T $lds $text_start $pie $nodl $nowarn $rodynamic $notext -o "$ofile" $map \
+ 	$platformo $tmp $object/wrapper.a
+     rm $tmp
+ fi
diff --git a/target/linux/generic/backport-6.1/300-v6.2-powerpc-suppress-some-linker-warnings-in-recent-link.patch b/target/linux/generic/backport-6.1/300-v6.2-powerpc-suppress-some-linker-warnings-in-recent-link.patch
new file mode 100644
index 0000000000..d8d0cf9555
--- /dev/null
+++ b/target/linux/generic/backport-6.1/300-v6.2-powerpc-suppress-some-linker-warnings-in-recent-link.patch
@@ -0,0 +1,63 @@
+From 579aee9fc594af94c242068c011b0233563d4bbf Mon Sep 17 00:00:00 2001
+From: Stephen Rothwell <sfr@canb.auug.org.au>
+Date: Mon, 10 Oct 2022 16:57:21 +1100
+Subject: [PATCH] powerpc: suppress some linker warnings in recent linker
+ versions
+
+This is a follow on from commit
+
+  0d362be5b142 ("Makefile: link with -z noexecstack --no-warn-rwx-segments")
+
+for arch/powerpc/boot to address wanrings like:
+
+  ld: warning: opal-calls.o: missing .note.GNU-stack section implies executable stack
+  ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker
+  ld: warning: arch/powerpc/boot/zImage.epapr has a LOAD segment with RWX permissions
+
+This fixes issue https://github.com/linuxppc/issues/issues/417
+
+Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
+Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
+Link: https://lore.kernel.org/r/20221010165721.106267e6@canb.auug.org.au
+---
+ arch/powerpc/boot/wrapper | 15 ++++++++++++++-
+ 1 file changed, 14 insertions(+), 1 deletion(-)
+
+--- a/arch/powerpc/boot/wrapper
++++ b/arch/powerpc/boot/wrapper
+@@ -215,6 +215,11 @@ ld_version()
+     }'
+ }
+ 
++ld_is_lld()
++{
++	${CROSS}ld -V 2>&1 | grep -q LLD
++}
++
+ # Do not include PT_INTERP segment when linking pie. Non-pie linking
+ # just ignores this option.
+ LD_VERSION=$(${CROSS}ld --version | ld_version)
+@@ -223,6 +228,14 @@ if [ "$LD_VERSION" -ge "$LD_NO_DL_MIN_VE
+ 	nodl="--no-dynamic-linker"
+ fi
+ 
++# suppress some warnings in recent ld versions
++nowarn="-z noexecstack"
++if ! ld_is_lld; then
++	if [ "$LD_VERSION" -ge "$(echo 2.39 | ld_version)" ]; then
++		nowarn="$nowarn --no-warn-rwx-segments"
++	fi
++fi
++
+ platformo=$object/"$platform".o
+ lds=$object/zImage.lds
+ ext=strip
+@@ -504,7 +517,7 @@ if [ "$platform" != "miboot" ]; then
+         text_start="-Ttext $link_address"
+     fi
+ #link everything
+-    ${CROSS}ld -m $format -T $lds $text_start $pie $nodl $rodynamic $notext -o "$ofile" $map \
++    ${CROSS}ld -m $format -T $lds $text_start $pie $nodl $nowarn $rodynamic $notext -o "$ofile" $map \
+ 	$platformo $tmp $object/wrapper.a
+     rm $tmp
+ fi