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riscv: support trap-based WARN()

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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: Vincent Chen <vincentc@andestech.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Vincent Chen 2019-03-05 11:23:33 +08:00 committed by Palmer Dabbelt
parent a21344dfc6
commit d18ebc274c
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1 changed files with 18 additions and 10 deletions
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26
arch/riscv/include/asm/bug.h
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@ -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>