arch/powerpc/include/asm/bug.h

Source file repositories/reference/linux-study-clean/arch/powerpc/include/asm/bug.h

File Facts

System
Linux kernel
Corpus path
arch/powerpc/include/asm/bug.h
Extension
.h
Size
3385 bytes
Lines
135
Domain
Architecture Layer
Bucket
arch/powerpc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _ASM_POWERPC_BUG_H
#define _ASM_POWERPC_BUG_H
#ifdef __KERNEL__

#include <asm/asm-compat.h>

#ifdef CONFIG_BUG

#ifdef __ASSEMBLER__
#include <asm/asm-offsets.h>
#ifdef CONFIG_DEBUG_BUGVERBOSE
.macro EMIT_BUG_ENTRY addr,file,line,flags
	 .section __bug_table,"aw"
5001:	 .4byte \addr - .
	 .4byte 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,"aw"
5001:	 .4byte \addr - .
	 .short \flags
	 .org 5001b+BUG_ENTRY_SIZE
	 .previous
.endm
#endif /* verbose */

#else /* !__ASSEMBLER__ */
/* _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,\"aw\"\n"		\
	"2:	.4byte 1b - .\n"		\
	"	.4byte %0 - .\n"		\
	"	.short %1, %2\n"		\
	".org 2b+%3\n"				\
	".previous\n"
#else
#define _EMIT_BUG_ENTRY				\
	".section __bug_table,\"aw\"\n"		\
	"2:	.4byte 1b - .\n"		\
	"	.short %2\n"			\
	".org 2b+%3\n"				\
	".previous\n"
#endif

#define BUG_ENTRY(cond_str, insn, flags, ...)		\
	__asm__ __volatile__(				\
		"1:	" insn "\n"			\
		_EMIT_BUG_ENTRY				\
		: : "i" (WARN_CONDITION_STR(cond_str) __FILE__), "i" (__LINE__),	\
		  "i" (flags),				\
		  "i" (sizeof(struct bug_entry)),	\
		  ##__VA_ARGS__)

/*
 * 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 {						\
	BUG_ENTRY("", "twi 31, 0, 0", 0);			\
	unreachable();						\
} while (0)
#define HAVE_ARCH_BUG

#define __WARN_FLAGS(cond_str, flags) BUG_ENTRY(cond_str, "twi 31, 0, 0", BUGFLAG_WARNING | (flags))

#ifdef CONFIG_PPC64
#define BUG_ON(x) do {						\
	if (__builtin_constant_p(x)) {				\
		if (x)						\
			BUG();					\
	} else {						\
		BUG_ENTRY(#x, PPC_TLNEI " %4, 0", 0, "r" ((__force long)(x)));	\
	}							\
} while (0)

#define WARN_ON(x) ({						\
	int __ret_warn_on = !!(x);				\
	if (__builtin_constant_p(__ret_warn_on)) {		\
		if (__ret_warn_on)				\
			__WARN();				\

Annotation

Implementation Notes