From: Vineet Gupta <vgupta@synopsys.com>
Date: Fri, 8 Dec 2017 16:45:57 +0000 (-0800)
Subject: ARC: handle gcc generated __builtin_trap for older compiler
X-Git-Tag: v4.4.185~4
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a62a40c8a3ff18d255d2a325c7780708d54fadc1;p=thirdparty%2Fkernel%2Fstable.git

ARC: handle gcc generated __builtin_trap for older compiler

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@arndb.de>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/arch/arc/kernel/traps.c b/arch/arc/kernel/traps.c
index c927aa84e652e..2fb0cd39a31c8 100644
--- a/arch/arc/kernel/traps.c
+++ b/arch/arc/kernel/traps.c
@@ -155,3 +155,11 @@ 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");
+}