loongarch: Disable relaxation relocations

Signed-off-by: Yingkun Meng <mengyingkun@loongson.cn>

1008-loongarch-Disable-relaxation-relocations.patch

@@ -0,0 +1,64 @@
+From 115c628cc44f89207858d0c79e970e43da75c772 Mon Sep 17 00:00:00 2001
+From: Yingkun Meng <mengyingkun@loongson.cn>
+Date: Tue, 5 Dec 2023 19:22:14 +0800
+Subject: [PATCH] loongarch: Disable relaxation relocations
+
+commit 87247635c0d583cfbc1947107d23b40877d107b8 upstream.
+
+A working GRUB cannot be built with upcoming binutils and GCC, because linker
+relaxation was added [1] causing new unsupported relocations to appear in modules.
+
+So we pass -mno-relax to GCC if it is supported, to disable relaxation and make
+GRUB forward-compatible with new toolchains.
+
+While similar code already exists for sparc64 in configure.ac, sparc64 sets
+LDFLAGS while LoongArch requires CFLAGS to be set. If we only set LDFLAGS on
+LoongArch, GCC will still generate relaxation relocations in the .o files, so
+the sparc64 code cannot be reused.
+
+[1] https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=56576f4a722b7398d35802ecf7d4185c27d6d69b
+
+Signed-off-by: Xiaotian Wu <wuxiaotian@loongson.cn>
+Signed-off-by: Yingkun Meng <mengyingkun@loongson.cn>
+Change-Id: I09ef306dc8a0f8a59e9b7dbc53ae3fd3cc09ec55
+---
+ configure.ac | 23 +++++++++++++++++++++++
+ 1 file changed, 23 insertions(+)
+
+diff --git a/configure.ac b/configure.ac
+index 0db9d7d111b8..e010bc0db465 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -908,6 +908,29 @@ if test "x$target_cpu" = xloongarch64; then
+     TARGET_CFLAGS="$TARGET_CFLAGS -mno-explicit-relocs -fno-plt"
+     TARGET_CCASFLAGS="$TARGET_CCASFLAGS -mno-explicit-relocs -fno-plt"
+   fi
++
++  AC_CACHE_CHECK([for no-relax options], grub_cv_target_cc_mno_relax, [
++    grub_cv_target_cc_mno_relax=no
++    for cand in "-mno-relax" "-Wa,-mno-relax"; do
++      if test x"$grub_cv_target_cc_mno_relax" != xno ; then
++        break
++      fi
++      CFLAGS="$TARGET_CFLAGS $cand -Werror"
++      AC_LINK_IFELSE([AC_LANG_PROGRAM([[
++            asm (".globl start; start:");
++            void __main (void);
++            void __main (void) {}
++            int main (void);
++            ]], [[]])], [grub_cv_target_cc_mno_relax="$cand"], [])
++    done
++  ])
++  CFLAGS="$TARGET_CFLAGS"
++
++  if test x"$grub_cv_target_cc_mno_relax" != xno ; then
++    TARGET_CFLAGS="$TARGET_CFLAGS $grub_cv_target_cc_mno_relax"
++    TARGET_CCASFLAGS="$TARGET_CCASFLAGS $grub_cv_target_cc_mno_relax"
++  fi
++
+   TARGET_CFLAGS="$TARGET_CFLAGS -Wa,-mla-global-with-abs"
+   TARGET_CCASFLAGS="$TARGET_CCASFLAGS -Wa,-mla-global-with-abs"
+ fi
+-- 
+2.33.0
+

grub.patches

@@ -342,3 +342,4 @@ Patch0342: backport-fs-ntfs-Fix-an-OOB-read-when-parsing-a-volume-label.patch
 Patch0343: backport-fs-ntfs-Make-code-more-readable.patch
 Patch0344: add-TPCM-support-with-ipmi-channel.patch
 Patch0345: skip-verification-when-not-loading-grub.cfg.patch
+Patch0346: 1008-loongarch-Disable-relaxation-relocations.patch

grub2.spec

@@ -14,7 +14,7 @@
 Name:		grub2
 Epoch:		1
 Version:	2.06
-Release:	42
+Release:	43
 Summary:	Bootloader with support for Linux, Multiboot and more
 License:	GPLv3+
 URL:		http://www.gnu.org/software/grub/
@@ -448,6 +448,12 @@ fi
 %{_datadir}/man/man*
 
 %changelog
+* Mon Dec 25 2023 mengyingkun <mengyingkun@loongson.cn> - 1:2.06-43
+- Type:requirement
+- CVE:NA
+- SUG:NA
+- DESC:loongarch: Disable relaxation relocations
+
 * Wed Dec 20 2023 zhangqiumiao <zhangqiumiao1@huawei.com> - 1:2.06-42
 - Type:requirement
 - CVE:NA