1 files changed, 121 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/bug.h b/arch/powerpc/include/asm/bug.h
new file mode 100644
index 000000000000..e55d1f66b86f
--- /dev/null
+++ b/arch/powerpc/include/asm/bug.h
@@ -0,0 +1,121 @@
+#ifndef _ASM_POWERPC_BUG_H
+#define _ASM_POWERPC_BUG_H
+#ifdef __KERNEL__
+
+#include <asm/asm-compat.h>
+/*
+ * Define an illegal instr to trap on the bug.
+ * We don't use 0 because that marks the end of a function
+ * in the ELF ABI.  That's "Boo Boo" in case you wonder...
+ */
+#define BUG_OPCODE .long 0x00b00b00  /* For asm */
+#define BUG_ILLEGAL_INSTR "0x00b00b00" /* For BUG macro */
+
+#ifdef CONFIG_BUG
+
+#ifdef __ASSEMBLY__
+#ifdef CONFIG_DEBUG_BUGVERBOSE
+.macro EMIT_BUG_ENTRY addr,file,line,flags
+	 .section __bug_table,"a"
+5001:	 PPC_LONG \addr, 5002f
+	 .short \line, \flags
+	 .org 5001b+BUG_ENTRY_SIZE
+	 .previous
+	 .section .rodata,"a"
+5002:	 .asciz "\file"
+	 .previous
+.endm
+#else
+ .macro EMIT_BUG_ENTRY addr,file,line,flags
+	 .section __bug_table,"a"
+5001:	 PPC_LONG \addr
+	 .short \flags
+	 .org 5001b+BUG_ENTRY_SIZE
+	 .previous
+.endm
+#endif /* verbose */
+
+#else /* !__ASSEMBLY__ */
+/* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and
+   sizeof(struct bug_entry), respectively */
+#ifdef CONFIG_DEBUG_BUGVERBOSE
+#define _EMIT_BUG_ENTRY				\
+	".section __bug_table,\"a\"\n"		\
+	"2:\t" PPC_LONG "1b, %0\n"		\
+	"\t.short %1, %2\n"			\
+	".org 2b+%3\n"				\
+	".previous\n"
+#else
+#define _EMIT_BUG_ENTRY				\
+	".section __bug_table,\"a\"\n"		\
+	"2:\t" PPC_LONG "1b\n"			\
+	"\t.short %2\n"				\
+	".org 2b+%3\n"				\
+	".previous\n"
+#endif
+
+/*
+ * BUG_ON() and WARN_ON() do their best to cooperate with compile-time
+ * optimisations. However depending on the complexity of the condition
+ * some compiler versions may not produce optimal results.
+ */
+
+#define BUG() do {						\
+	__asm__ __volatile__(					\
+		"1:	twi 31,0,0\n"				\
+		_EMIT_BUG_ENTRY					\
+		: : "i" (__FILE__), "i" (__LINE__),		\
+		    "i" (0), "i"  (sizeof(struct bug_entry)));	\
+	for(;;) ;						\
+} while (0)
+
+#define BUG_ON(x) do {						\
+	if (__builtin_constant_p(x)) {				\
+		if (x)						\
+			BUG();					\
+	} else {						\
+		__asm__ __volatile__(				\
+		"1:	"PPC_TLNEI"	%4,0\n"			\
+		_EMIT_BUG_ENTRY					\
+		: : "i" (__FILE__), "i" (__LINE__), "i" (0),	\
+		  "i" (sizeof(struct bug_entry)),		\
+		  "r" ((__force long)(x)));			\
+	}							\
+} while (0)
+
+#define __WARN() do {						\
+	__asm__ __volatile__(					\
+		"1:	twi 31,0,0\n"				\
+		_EMIT_BUG_ENTRY					\
+		: : "i" (__FILE__), "i" (__LINE__),		\
+		  "i" (BUGFLAG_WARNING),			\
+		  "i" (sizeof(struct bug_entry)));		\
+} while (0)
+
+#define WARN_ON(x) ({						\
+	int __ret_warn_on = !!(x);				\
+	if (__builtin_constant_p(__ret_warn_on)) {		\
+		if (__ret_warn_on)				\
+			__WARN();				\
+	} else {						\
+		__asm__ __volatile__(				\
+		"1:	"PPC_TLNEI"	%4,0\n"			\
+		_EMIT_BUG_ENTRY					\
+		: : "i" (__FILE__), "i" (__LINE__),		\
+		  "i" (BUGFLAG_WARNING),			\
+		  "i" (sizeof(struct bug_entry)),		\
+		  "r" (__ret_warn_on));				\
+	}							\
+	unlikely(__ret_warn_on);				\
+})
+
+#define HAVE_ARCH_BUG
+#define HAVE_ARCH_BUG_ON
+#define HAVE_ARCH_WARN_ON
+#endif /* __ASSEMBLY __ */
+#endif /* CONFIG_BUG */
+
+#include <asm-generic/bug.h>
+
+#endif /* __KERNEL__ */
+#endif /* _ASM_POWERPC_BUG_H */