From a053dab90e69c2a8289c95caec236f239a2a764b Mon Sep 17 00:00:00 2001
From: Daniel Cederman <cederman@gaisler.com>
Date: Thu, 1 Oct 2020 09:11:38 +0200
Subject: [PATCH] sparc: Add NOP in stack_protect_set32 if sparc_fix_b2bst
enabled
This is needed to prevent the Store -> (Non-store or load) -> Store
sequence.
gcc/ChangeLog:
* config/sparc/sparc.md (stack_protect_set32): Add NOP to prevent
sensitive sequence for B2BST errata workaround.
---
gcc/config/sparc/sparc.md | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/gcc/config/sparc/sparc.md b/gcc/config/sparc/sparc.md
index 24b76e0cacd4..3ac074a244d5 100644
--- a/gcc/config/sparc/sparc.md
+++ b/gcc/config/sparc/sparc.md
@@ -8353,9 +8353,15 @@ visl")
(unspec:SI [(match_operand:SI 1 "memory_operand" "m")] UNSPEC_SP_SET))
(set (match_scratch:SI 2 "=&r") (const_int 0))]
"TARGET_ARCH32"
- "ld\t%1, %2\;st\t%2, %0\;mov\t0, %2"
+{
+ if (sparc_fix_b2bst)
+ return "ld\t%1, %2\;st\t%2, %0\;mov\t0, %2\;nop";
+ else
+ return "ld\t%1, %2\;st\t%2, %0\;mov\t0, %2";
+}
[(set_attr "type" "multi")
- (set_attr "length" "3")])
+ (set (attr "length") (if_then_else (eq_attr "fix_b2bst" "true")
+ (const_int 4) (const_int 3)))])
(define_insn "stack_protect_set64"
[(set (match_operand:DI 0 "memory_operand" "=m")
--
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