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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/powerpc/include/asm/bug.h
15117 views
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#ifndef _ASM_POWERPC_BUG_H

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#define _ASM_POWERPC_BUG_H

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#ifdef __KERNEL__

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#include <asm/asm-compat.h>

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/*

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 * Define an illegal instr to trap on the bug.

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 * We don't use 0 because that marks the end of a function

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 * in the ELF ABI.  That's "Boo Boo" in case you wonder...

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 */

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#define BUG_OPCODE .long 0x00b00b00  /* For asm */

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#define BUG_ILLEGAL_INSTR "0x00b00b00" /* For BUG macro */

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#ifdef CONFIG_BUG

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#ifdef __ASSEMBLY__

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#include <asm/asm-offsets.h>

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#ifdef CONFIG_DEBUG_BUGVERBOSE

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.macro EMIT_BUG_ENTRY addr,file,line,flags

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	 .section __bug_table,"a"

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5001:	 PPC_LONG \addr, 5002f

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	 .short \line, \flags

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	 .org 5001b+BUG_ENTRY_SIZE

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	 .previous

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	 .section .rodata,"a"

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5002:	 .asciz "\file"

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	 .previous

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.endm

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#else

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.macro EMIT_BUG_ENTRY addr,file,line,flags

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	 .section __bug_table,"a"

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5001:	 PPC_LONG \addr

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	 .short \flags

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	 .org 5001b+BUG_ENTRY_SIZE

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	 .previous

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.endm

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#endif /* verbose */

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#else /* !__ASSEMBLY__ */

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/* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and

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   sizeof(struct bug_entry), respectively */

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#ifdef CONFIG_DEBUG_BUGVERBOSE

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#define _EMIT_BUG_ENTRY				\

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	".section __bug_table,\"a\"\n"		\

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	"2:\t" PPC_LONG "1b, %0\n"		\

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	"\t.short %1, %2\n"			\

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

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	".previous\n"

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#else

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#define _EMIT_BUG_ENTRY				\

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	".section __bug_table,\"a\"\n"		\

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	"2:\t" PPC_LONG "1b\n"			\

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	"\t.short %2\n"				\

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

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	".previous\n"

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#endif

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/*

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 * BUG_ON() and WARN_ON() do their best to cooperate with compile-time

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 * optimisations. However depending on the complexity of the condition

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 * some compiler versions may not produce optimal results.

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 */

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#define BUG() do {						\

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	__asm__ __volatile__(					\

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		"1:	twi 31,0,0\n"				\

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		_EMIT_BUG_ENTRY					\

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

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		    "i" (0), "i"  (sizeof(struct bug_entry)));	\

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	unreachable();						\

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} while (0)

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#define BUG_ON(x) do {						\

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	if (__builtin_constant_p(x)) {				\

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		if (x)						\

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			BUG();					\

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	} else {						\

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		__asm__ __volatile__(				\

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		"1:	"PPC_TLNEI"	%4,0\n"			\

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		_EMIT_BUG_ENTRY					\

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		: : "i" (__FILE__), "i" (__LINE__), "i" (0),	\

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

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		  "r" ((__force long)(x)));			\

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	}							\

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} while (0)

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#define __WARN_TAINT(taint) do {				\

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	__asm__ __volatile__(					\

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		"1:	twi 31,0,0\n"				\

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		_EMIT_BUG_ENTRY					\

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

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		  "i" (BUGFLAG_TAINT(taint)),			\

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

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} while (0)

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#define WARN_ON(x) ({						\

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	int __ret_warn_on = !!(x);				\

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	if (__builtin_constant_p(__ret_warn_on)) {		\

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		if (__ret_warn_on)				\

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			__WARN();				\

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	} else {						\

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		__asm__ __volatile__(				\

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		"1:	"PPC_TLNEI"	%4,0\n"			\

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		_EMIT_BUG_ENTRY					\

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

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		  "i" (BUGFLAG_TAINT(TAINT_WARN)),		\

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

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		  "r" (__ret_warn_on));				\

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	}							\

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	unlikely(__ret_warn_on);				\

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})

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#define HAVE_ARCH_BUG

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#define HAVE_ARCH_BUG_ON

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#define HAVE_ARCH_WARN_ON

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#endif /* __ASSEMBLY __ */

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#else

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#ifdef __ASSEMBLY__

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.macro EMIT_BUG_ENTRY addr,file,line,flags

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.endm

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#else /* !__ASSEMBLY__ */

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#define _EMIT_BUG_ENTRY

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#endif

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#endif /* CONFIG_BUG */

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#include <asm-generic/bug.h>

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#endif /* __KERNEL__ */

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#endif /* _ASM_POWERPC_BUG_H */

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