[patch] gcc-ia64-don-t-generate-gprel64-relocations-for-linux-ke.patch

gcc-ia64-don-t-generate-gprel64-relocations-for-linux-ke.patch (text/plain), 1.75 KB, created by Sergei Trofimovich (RETIRED) on 2017-03-18 11:43:55 UTC

From f63756e7e60f244c2c4ca537c5fd61f527a49585 Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <[e-mail]>
Date: Sat, 18 Mar 2017 11:32:05 +0000
Subject: [PATCH] ia64: don't generate gprel64 relocations for linux kernel
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

linux kernel runtime linker does not support all relocation
types yet. Recently added gprel64 broke linux kernel
module loading:

   :: Loading from mdadm: raid0: invalid slot number 1 for IMM64
   raid1: invalid slot number 1 for IMM64

The fix is to disable gprel64 optimisation in '-mconstant-gp' mode.

Reported-by: Émeric Maschino
Bug: https://bugs.gentoo.org/show_bug.cgi?id=601014
Signed-off-by: Sergei Trofimovich <[e-mail]>
---
 gcc/config/ia64/ia64.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/gcc/config/ia64/ia64.c b/gcc/config/ia64/ia64.c
index 617d188d4f2..3fb8f278e24 100644
--- a/gcc/config/ia64/ia64.c
+++ b/gcc/config/ia64/ia64.c
@@ -1111,13 +1111,17 @@ ia64_expand_load_address (rtx dest, rtx src)
     emit_insn (gen_load_fptr (dest, src));
   else if (sdata_symbolic_operand (src, VOIDmode))
     emit_insn (gen_load_gprel (dest, src));
-  else if (local_symbolic_operand64 (src, VOIDmode))
+  else if ((!TARGET_CONST_GP) && local_symbolic_operand64 (src, VOIDmode))
     {
       /* We want to use @gprel rather than @ltoff relocations for local
 	 symbols:
 	  - @gprel does not require dynamic linker
 	  - and does not use .sdata section
-	 https://gcc.gnu.org/bugzilla/60465 */
+	 https://gcc.gnu.org/bugzilla/60465
+
+	 Unfortunately linux kernel does not support gprel64 relocations
+	 yet: https://bugs.gentoo.org/601014
+	 */
       emit_insn (gen_load_gprel64 (dest, src));
     }
   else
-- 
2.12.0