[linux-2.6-block.git] / arch / powerpc / include / asm / jump_label.h

#ifndef _ASM_POWERPC_JUMP_LABEL_H
#define _ASM_POWERPC_JUMP_LABEL_H

/*
 * Copyright 2010 Michael Ellerman, IBM Corp.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#ifndef __ASSEMBLY__
#include <linux/types.h>

#include <asm/feature-fixups.h>
#include <asm/asm-compat.h>

#define JUMP_ENTRY_TYPE		stringify_in_c(FTR_ENTRY_LONG)
#define JUMP_LABEL_NOP_SIZE	4

static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
{
	asm_volatile_goto("1:\n\t"
		 "nop # arch_static_branch\n\t"
		 ".pushsection __jump_table,  \"aw\"\n\t"
		 JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t"
		 ".popsection \n\t"
		 : :  "i" (&((char *)key)[branch]) : : l_yes);

	return false;
l_yes:
	return true;
}

static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
{
	asm_volatile_goto("1:\n\t"
		 "b %l[l_yes] # arch_static_branch_jump\n\t"
		 ".pushsection __jump_table,  \"aw\"\n\t"
		 JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t"
		 ".popsection \n\t"
		 : :  "i" (&((char *)key)[branch]) : : l_yes);

	return false;
l_yes:
	return true;
}

#ifdef CONFIG_PPC64
typedef u64 jump_label_t;
#else
typedef u32 jump_label_t;
#endif

struct jump_entry {
	jump_label_t code;
	jump_label_t target;
	jump_label_t key;
};

#else
#define ARCH_STATIC_BRANCH(LABEL, KEY)		\
1098:	nop;					\
	.pushsection __jump_table, "aw";	\
	FTR_ENTRY_LONG 1098b, LABEL, KEY;	\
	.popsection
#endif

#endif /* _ASM_POWERPC_JUMP_LABEL_H */
Commit	Line	Data
ac5f89c7 ME	1	#ifndef _ASM_POWERPC_JUMP_LABEL_H
	2	#define _ASM_POWERPC_JUMP_LABEL_H
	3
	4	/*
	5	* Copyright 2010 Michael Ellerman, IBM Corp.
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* as published by the Free Software Foundation; either version
	10	* 2 of the License, or (at your option) any later version.
	11	*/
	12
cc1adb5f	13	#ifndef __ASSEMBLY__
ac5f89c7 ME	14	#include <linux/types.h>
	15
	16	#include <asm/feature-fixups.h>
5411fd7f	17	#include <asm/asm-compat.h>
ac5f89c7 ME	18
	19	#define JUMP_ENTRY_TYPE stringify_in_c(FTR_ENTRY_LONG)
	20	#define JUMP_LABEL_NOP_SIZE 4
	21
11276d53	22	static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
ac5f89c7	23	{
3f0116c3	24	asm_volatile_goto("1:\n\t"
e2985fd9	25	"nop # arch_static_branch\n\t"
ac5f89c7	26	".pushsection __jump_table, \"aw\"\n\t"
ac5f89c7 ME	27	JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t"
ac5f89c7 ME	28	".popsection \n\t"
11276d53 PZ	29	: : "i" (&((char *)key)[branch]) : : l_yes);
	30
	31	return false;
	32	l_yes:
	33	return true;
	34	}
	35
	36	static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
	37	{
	38	asm_volatile_goto("1:\n\t"
e2985fd9	39	"b %l[l_yes] # arch_static_branch_jump\n\t"
11276d53 PZ	40	".pushsection __jump_table, \"aw\"\n\t"
	41	JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t"
	42	".popsection \n\t"
	43	: : "i" (&((char *)key)[branch]) : : l_yes);
	44
ac5f89c7 ME	45	return false;
	46	l_yes:
	47	return true;
	48	}
	49
	50	#ifdef CONFIG_PPC64
	51	typedef u64 jump_label_t;
	52	#else
	53	typedef u32 jump_label_t;
	54	#endif
	55
	56	struct jump_entry {
	57	jump_label_t code;
	58	jump_label_t target;
	59	jump_label_t key;
ac5f89c7 ME	60	};
ac5f89c7 ME	61
cc1adb5f AB	62	#else
	63	#define ARCH_STATIC_BRANCH(LABEL, KEY) \
	64	1098: nop; \
	65	.pushsection __jump_table, "aw"; \
	66	FTR_ENTRY_LONG 1098b, LABEL, KEY; \
	67	.popsection
	68	#endif
	69
ac5f89c7	70	#endif /* _ASM_POWERPC_JUMP_LABEL_H */