[Buildroot] [PATCH] package/gcc: nios2 Backport nios2 r31 fix
Romain Naour
romain.naour at gmail.com
Sat Oct 8 13:46:52 UTC 2016
As reported on the mailing list, gcc5 with binutils 2.26.1 produce some
assembler error "r31 cannot be used with jmp; use ret instead" [1]
The bug is reported upstream [2], but gcc 5.4 needs an upstream patch to
fix this issue.
Note: openembedded backported the same patch for gcc 5.3 [3]
[1] http://lists.busybox.net/pipermail/buildroot/2016-September/172932.html
[2] https://sourceware.org/bugzilla/show_bug.cgi?id=20674
[3] http://lists.openembedded.org/pipermail/openembedded-core/2016-February/117633.html
Signed-off-by: Romain Naour <romain.naour at gmail.com>
---
.../5.4.0/880-gcc-nios2-Add-IJMP_REGS-enum.patch | 103 +++++++++++++++++++++
1 file changed, 103 insertions(+)
create mode 100644 package/gcc/5.4.0/880-gcc-nios2-Add-IJMP_REGS-enum.patch
diff --git a/package/gcc/5.4.0/880-gcc-nios2-Add-IJMP_REGS-enum.patch b/package/gcc/5.4.0/880-gcc-nios2-Add-IJMP_REGS-enum.patch
new file mode 100644
index 0000000..7a8c843
--- /dev/null
+++ b/package/gcc/5.4.0/880-gcc-nios2-Add-IJMP_REGS-enum.patch
@@ -0,0 +1,103 @@
+From 920a898d2a04933c13eb808a513bc5822e91f70a Mon Sep 17 00:00:00 2001
+From: sandra <sandra at 138bc75d-0d04-0410-961f-82ee72b054a4>
+Date: Tue, 12 May 2015 15:57:22 +0000
+Subject: [PATCH] gcc/nios2: Add IJMP_REGS enum
+
+2015-05-12 Chung-Lin Tang <cltang at codesourcery.com>
+ Sandra Loosemore <sandra at codesourcery.com>
+
+ gcc/
+ * config/nios2/nios2.h (enum reg_class): Add IJMP_REGS enum
+ value.
+ (REG_CLASS_NAMES): Add "IJMP_REGS".
+ (REG_CLASS_CONTENTS): Add new entry for IJMP_REGS.
+ * config/nios2/nios2.md (indirect_jump,*tablejump): Adjust to
+ use new "c" register constraint.
+ * config/nios2/constraint.md (c): New register constraint
+ corresponding to IJMP_REGS.
+
+git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@223082 138bc75d-0d04-0410-961f-82ee72b054a4
+
+[Romain: rebase on gcc 5.4]
+Signed-off-by: Romain Naour <romain.naour at gmail.com>
+---
+ gcc/config/nios2/constraints.md | 3 +++
+ gcc/config/nios2/nios2.h | 11 +++++++----
+ gcc/config/nios2/nios2.md | 4 ++--
+ 3 files changed, 12 insertions(+), 6 deletions(-)
+
+diff --git a/gcc/config/nios2/constraints.md b/gcc/config/nios2/constraints.md
+index f4bd9f7..735f892 100644
+--- a/gcc/config/nios2/constraints.md
++++ b/gcc/config/nios2/constraints.md
+@@ -39,6 +39,9 @@
+
+ ;; Register constraints
+
++(define_register_constraint "c" "IJMP_REGS"
++ "A register suitable for an indirect jump.")
++
+ (define_register_constraint "j" "SIB_REGS"
+ "A register suitable for an indirect sibcall.")
+
+diff --git a/gcc/config/nios2/nios2.h b/gcc/config/nios2/nios2.h
+index 117983d..7c329ae 100644
+--- a/gcc/config/nios2/nios2.h
++++ b/gcc/config/nios2/nios2.h
+@@ -173,6 +173,7 @@ enum reg_class
+ {
+ NO_REGS,
+ SIB_REGS,
++ IJMP_REGS,
+ GP_REGS,
+ ALL_REGS,
+ LIM_REG_CLASSES
+@@ -183,6 +184,7 @@ enum reg_class
+ #define REG_CLASS_NAMES \
+ { "NO_REGS", \
+ "SIB_REGS", \
++ "IJMP_REGS", \
+ "GP_REGS", \
+ "ALL_REGS" }
+
+@@ -190,10 +192,11 @@ enum reg_class
+
+ #define REG_CLASS_CONTENTS \
+ { \
+- /* NO_REGS */ { 0, 0}, \
+- /* SIB_REGS */ { 0xfe0c, 0}, \
+- /* GP_REGS */ {~0, 0}, \
+- /* ALL_REGS */ {~0,~0} \
++ /* NO_REGS */ { 0, 0}, \
++ /* SIB_REGS */ { 0xfe0c, 0}, \
++ /* IJMP_REGS */ { 0x7fffffff, 0}, \
++ /* GP_REGS */ {~0, 0}, \
++ /* ALL_REGS */ {~0,~0} \
+ }
+
+
+diff --git a/gcc/config/nios2/nios2.md b/gcc/config/nios2/nios2.md
+index 7b35d269..36ef101 100644
+--- a/gcc/config/nios2/nios2.md
++++ b/gcc/config/nios2/nios2.md
+@@ -697,7 +697,7 @@
+ ; check or adjust for overflow.
+
+ (define_insn "indirect_jump"
+- [(set (pc) (match_operand:SI 0 "register_operand" "r"))]
++ [(set (pc) (match_operand:SI 0 "register_operand" "c"))]
+ ""
+ "jmp\\t%0"
+ [(set_attr "type" "control")])
+@@ -811,7 +811,7 @@
+
+ (define_insn "*tablejump"
+ [(set (pc)
+- (match_operand:SI 0 "register_operand" "r"))
++ (match_operand:SI 0 "register_operand" "c"))
+ (use (label_ref (match_operand 1 "" "")))]
+ ""
+ "jmp\\t%0"
+--
+2.5.5
+
--
2.5.5
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