linux-kernel - [PATCH 2/2] ARC: handle gcc generated __builtin

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Date:   Wed, 20 Dec 2017 14:49:54 -0800
From:   Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:     <linux-snps-arc@...ts.infradead.org>
CC:     <linux-kernel@...r.kernel.org>, Arnd Bergmann <arnd@...db.de>,
        "Vineet Gupta" <Vineet.Gupta1@...opsys.com>
Subject: [PATCH 2/2] ARC: handle gcc generated __builtin_trap for older compiler

ARC gcc prior to GNU 2018.03 release didn't have a target specific
__builtin_trap() implementation, generating default abort() call.

Implement the abort() call - emulating what newer gcc does for the same,
as suggested by Arnd.

Signed-off-by: Vineet Gupta <vgupta@...opsys.com>
---
 arch/arc/kernel/traps.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arc/kernel/traps.c b/arch/arc/kernel/traps.c
index 004f4e4a4c10..51a55b06cb2a 100644
--- a/arch/arc/kernel/traps.c
+++ b/arch/arc/kernel/traps.c
@@ -161,3 +161,12 @@ void do_insterror_or_kprobe(unsigned long address, struct pt_regs *regs)
 
 	insterror_is_error(address, regs);
 }
+
+/*
+ * abort() call generated by older gcc for __builtin_trap()
+ */
+void abort(void)
+{
+	__asm__ __volatile__("trap_s  5\n");
+}
+EXPORT_SYMBOL(abort);
-- 
2.7.4