Unverified Commit d18ebc27 authored by Vincent Chen's avatar Vincent Chen Committed by Palmer Dabbelt
Browse files

riscv: support trap-based WARN() 



The WARN() related function will trigger a debug exception. This can help
developers to analyze the cause of WARN() because if the debugger is
connected, the control flow will be transferred to debugging
environment.

Signed-off-by: default avatarVincent Chen <vincentc@andestech.com>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarPalmer Dabbelt <palmer@sifive.com>
parent a21344df

arch/riscv/include/asm/bug.h

+18 −10
Original line number Diff line number Diff line
@@ -38,38 +38,46 @@ typedef u32 bug_insn_t; 
#define __BUG_ENTRY			\

	__BUG_ENTRY_ADDR "\n\t"		\

	__BUG_ENTRY_FILE "\n\t"		\

	RISCV_SHORT " %1"

	RISCV_SHORT " %1\n\t"		\

	RISCV_SHORT " %2"

#else

#define __BUG_ENTRY			\

	__BUG_ENTRY_ADDR

	__BUG_ENTRY_ADDR "\n\t"		\

	RISCV_SHORT " %2"

#endif



#define BUG()							\

#define __BUG_FLAGS(flags)					\

do {								\

	__asm__ __volatile__ (					\

		"1:\n\t"					\

			"ebreak\n"				\

			".pushsection __bug_table,\"a\"\n\t"	\

			".pushsection __bug_table,\"aw\"\n\t"	\

		"2:\n\t"					\

			__BUG_ENTRY "\n\t"			\

			".org 2b + %2\n\t"			\

			".org 2b + %3\n\t"                      \

			".popsection"				\

		:						\

		: "i" (__FILE__), "i" (__LINE__),		\

		  "i" (flags),					\

		  "i" (sizeof(struct bug_entry)));              \

	unreachable();						\

} while (0)



#endif /* !__ASSEMBLY__ */

#else /* CONFIG_GENERIC_BUG */

#ifndef __ASSEMBLY__

#define BUG()							\

do {								\

#define __BUG_FLAGS(flags) do {					\

	__asm__ __volatile__ ("ebreak\n");			\

	unreachable();						\

} while (0)

#endif /* !__ASSEMBLY__ */

#endif /* CONFIG_GENERIC_BUG */



#define BUG() do {						\

	__BUG_FLAGS(0);						\

	unreachable();						\

} while (0)



#define __WARN_FLAGS(flags) __BUG_FLAGS(BUGFLAG_WARNING|(flags))



#define HAVE_ARCH_BUG



#include <asm-generic/bug.h>