linux-kernel - [PATCH 4.14 49/56] ARC: handle gcc generated __builtin

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Message-Id: <20190708150523.993723125@linuxfoundation.org>
Date:   Mon,  8 Jul 2019 17:13:41 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Vineet Gupta <vgupta@...opsys.com>
Subject: [PATCH 4.14 49/56] ARC: handle gcc generated __builtin_trap for older compiler

From: Vineet Gupta <vgupta@...opsys.com>

commit af1be2e21203867cb958aaceed5366e2e24b88e8 upstream.

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.

Acked-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Vineet Gupta <vgupta@...opsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arc/kernel/traps.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/arch/arc/kernel/traps.c
+++ b/arch/arc/kernel/traps.c
@@ -155,3 +155,11 @@ void do_insterror_or_kprobe(unsigned lon
 
 	insterror_is_error(address, regs);
 }
+
+/*
+ * abort() call generated by older gcc for __builtin_trap()
+ */
+void abort(void)
+{
+	__asm__ __volatile__("trap_s  5\n");
+}