[mirror_ubuntu-artful-kernel.git] / arch / x86 / include / asm / asm.h

#ifndef _ASM_X86_ASM_H
#define _ASM_X86_ASM_H

#ifdef __ASSEMBLY__
# define __ASM_FORM(x)	x
# define __ASM_FORM_RAW(x)     x
# define __ASM_FORM_COMMA(x) x,
#else
# define __ASM_FORM(x)	" " #x " "
# define __ASM_FORM_RAW(x)     #x
# define __ASM_FORM_COMMA(x) " " #x ","
#endif

#ifdef CONFIG_X86_32
# define __ASM_SEL(a,b) __ASM_FORM(a)
# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a)
#else
# define __ASM_SEL(a,b) __ASM_FORM(b)
# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b)
#endif

#define __ASM_SIZE(inst, ...)	__ASM_SEL(inst##l##__VA_ARGS__, \
					  inst##q##__VA_ARGS__)
#define __ASM_REG(reg)         __ASM_SEL_RAW(e##reg, r##reg)

#define _ASM_PTR	__ASM_SEL(.long, .quad)
#define _ASM_ALIGN	__ASM_SEL(.balign 4, .balign 8)

#define _ASM_MOV	__ASM_SIZE(mov)
#define _ASM_INC	__ASM_SIZE(inc)
#define _ASM_DEC	__ASM_SIZE(dec)
#define _ASM_ADD	__ASM_SIZE(add)
#define _ASM_SUB	__ASM_SIZE(sub)
#define _ASM_XADD	__ASM_SIZE(xadd)
#define _ASM_MUL	__ASM_SIZE(mul)

#define _ASM_AX		__ASM_REG(ax)
#define _ASM_BX		__ASM_REG(bx)
#define _ASM_CX		__ASM_REG(cx)
#define _ASM_DX		__ASM_REG(dx)
#define _ASM_SP		__ASM_REG(sp)
#define _ASM_BP		__ASM_REG(bp)
#define _ASM_SI		__ASM_REG(si)
#define _ASM_DI		__ASM_REG(di)

/*
 * Macros to generate condition code outputs from inline assembly,
 * The output operand must be type "bool".
 */
#ifdef __GCC_ASM_FLAG_OUTPUTS__
# define CC_SET(c) "\n\t/* output condition code " #c "*/\n"
# define CC_OUT(c) "=@cc" #c
#else
# define CC_SET(c) "\n\tset" #c " %[_cc_" #c "]\n"
# define CC_OUT(c) [_cc_ ## c] "=qm"
#endif

/* Exception table entry */
#ifdef __ASSEMBLY__
# define _ASM_EXTABLE_HANDLE(from, to, handler)			\
	.pushsection "__ex_table","a" ;				\
	.balign 4 ;						\
	.long (from) - . ;					\
	.long (to) - . ;					\
	.long (handler) - . ;					\
	.popsection

# define _ASM_EXTABLE(from, to)					\
	_ASM_EXTABLE_HANDLE(from, to, ex_handler_default)

# define _ASM_EXTABLE_FAULT(from, to)				\
	_ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)

# define _ASM_EXTABLE_EX(from, to)				\
	_ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)

# define _ASM_NOKPROBE(entry)					\
	.pushsection "_kprobe_blacklist","aw" ;			\
	_ASM_ALIGN ;						\
	_ASM_PTR (entry);					\
	.popsection

.macro ALIGN_DESTINATION
	/* check for bad alignment of destination */
	movl %edi,%ecx
	andl $7,%ecx
	jz 102f				/* already aligned */
	subl $8,%ecx
	negl %ecx
	subl %ecx,%edx
100:	movb (%rsi),%al
101:	movb %al,(%rdi)
	incq %rsi
	incq %rdi
	decl %ecx
	jnz 100b
102:
	.section .fixup,"ax"
103:	addl %ecx,%edx			/* ecx is zerorest also */
	jmp copy_user_handle_tail
	.previous

	_ASM_EXTABLE(100b,103b)
	_ASM_EXTABLE(101b,103b)
	.endm

#else
# define _EXPAND_EXTABLE_HANDLE(x) #x
# define _ASM_EXTABLE_HANDLE(from, to, handler)			\
	" .pushsection \"__ex_table\",\"a\"\n"			\
	" .balign 4\n"						\
	" .long (" #from ") - .\n"				\
	" .long (" #to ") - .\n"				\
	" .long (" _EXPAND_EXTABLE_HANDLE(handler) ") - .\n"	\
	" .popsection\n"

# define _ASM_EXTABLE(from, to)					\
	_ASM_EXTABLE_HANDLE(from, to, ex_handler_default)

# define _ASM_EXTABLE_FAULT(from, to)				\
	_ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)

# define _ASM_EXTABLE_EX(from, to)				\
	_ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)

/* For C file, we already have NOKPROBE_SYMBOL macro */
#endif

#ifndef __ASSEMBLY__
/*
 * This output constraint should be used for any inline asm which has a "call"
 * instruction.  Otherwise the asm may be inserted before the frame pointer
 * gets set up by the containing function.  If you forget to do this, objtool
 * may print a "call without frame pointer save/setup" warning.
 */
register unsigned int __asm_call_sp asm("esp");
#define ASM_CALL_CONSTRAINT "+r" (__asm_call_sp)
#endif

#endif /* _ASM_X86_ASM_H */
Commit	Line	Data
1965aae3 PA	1	#ifndef _ASM_X86_ASM_H
1965aae3 PA	2	#define _ASM_X86_ASM_H
e845c06b	3
e6e07d8a JF	4	#ifdef __ASSEMBLY__
e6e07d8a JF	5	# define __ASM_FORM(x) x
3e9b2327	6	# define __ASM_FORM_RAW(x) x
a750036f	7	# define __ASM_FORM_COMMA(x) x,
e6e07d8a JF	8	#else
e6e07d8a JF	9	# define __ASM_FORM(x) " " #x " "
3e9b2327	10	# define __ASM_FORM_RAW(x) #x
a750036f	11	# define __ASM_FORM_COMMA(x) " " #x ","
e6e07d8a	12	#endif
8ee5797a	13
e6e07d8a JF	14	#ifdef CONFIG_X86_32
e6e07d8a JF	15	# define __ASM_SEL(a,b) __ASM_FORM(a)
3e9b2327	16	# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a)
e845c06b	17	#else
e6e07d8a	18	# define __ASM_SEL(a,b) __ASM_FORM(b)
3e9b2327	19	# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b)
e6e07d8a	20	#endif
e845c06b	21
4625cd63 JB	22	#define __ASM_SIZE(inst, ...) __ASM_SEL(inst##l##__VA_ARGS__, \
4625cd63 JB	23	inst##q##__VA_ARGS__)
3e9b2327	24	#define __ASM_REG(reg) __ASM_SEL_RAW(e##reg, r##reg)
e845c06b	25
e6e07d8a JF	26	#define _ASM_PTR __ASM_SEL(.long, .quad)
e6e07d8a JF	27	#define _ASM_ALIGN __ASM_SEL(.balign 4, .balign 8)
8ee5797a	28
8df9676d	29	#define _ASM_MOV __ASM_SIZE(mov)
e6e07d8a JF	30	#define _ASM_INC __ASM_SIZE(inc)
	31	#define _ASM_DEC __ASM_SIZE(dec)
	32	#define _ASM_ADD __ASM_SIZE(add)
	33	#define _ASM_SUB __ASM_SIZE(sub)
	34	#define _ASM_XADD __ASM_SIZE(xadd)
121843eb	35	#define _ASM_MUL __ASM_SIZE(mul)
8df9676d	36
40faf463	37	#define _ASM_AX __ASM_REG(ax)
2528de43 GC	38	#define _ASM_BX __ASM_REG(bx)
2528de43 GC	39	#define _ASM_CX __ASM_REG(cx)
40faf463	40	#define _ASM_DX __ASM_REG(dx)
8df9676d PA	41	#define _ASM_SP __ASM_REG(sp)
	42	#define _ASM_BP __ASM_REG(bp)
	43	#define _ASM_SI __ASM_REG(si)
	44	#define _ASM_DI __ASM_REG(di)
e845c06b	45
ff3554b4 PA	46	/*
	47	* Macros to generate condition code outputs from inline assembly,
	48	* The output operand must be type "bool".
	49	*/
	50	#ifdef __GCC_ASM_FLAG_OUTPUTS__
	51	# define CC_SET(c) "\n\t/* output condition code " #c "*/\n"
	52	# define CC_OUT(c) "=@cc" #c
	53	#else
	54	# define CC_SET(c) "\n\tset" #c " %[_cc_" #c "]\n"
	55	# define CC_OUT(c) [_cc_ ## c] "=qm"
	56	#endif
	57
a34746bc	58	/* Exception table entry */
709972b1	59	#ifdef __ASSEMBLY__
548acf19	60	# define _ASM_EXTABLE_HANDLE(from, to, handler) \
535c0c34	61	.pushsection "__ex_table","a" ; \
548acf19	62	.balign 4 ; \
70627654 PA	63	.long (from) - . ; \
70627654 PA	64	.long (to) - . ; \
548acf19	65	.long (handler) - . ; \
535c0c34 PA	66	.popsection
535c0c34 PA	67
548acf19 TL	68	# define _ASM_EXTABLE(from, to) \
	69	_ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
	70
	71	# define _ASM_EXTABLE_FAULT(from, to) \
	72	_ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
	73
	74	# define _ASM_EXTABLE_EX(from, to) \
	75	_ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)
376e2424 MH	76
	77	# define _ASM_NOKPROBE(entry) \
	78	.pushsection "_kprobe_blacklist","aw" ; \
	79	_ASM_ALIGN ; \
	80	_ASM_PTR (entry); \
	81	.popsection
9e6b13f7 BP	82
	83	.macro ALIGN_DESTINATION
	84	/* check for bad alignment of destination */
	85	movl %edi,%ecx
	86	andl $7,%ecx
	87	jz 102f /* already aligned */
	88	subl $8,%ecx
	89	negl %ecx
	90	subl %ecx,%edx
	91	100: movb (%rsi),%al
	92	101: movb %al,(%rdi)
	93	incq %rsi
	94	incq %rdi
	95	decl %ecx
	96	jnz 100b
	97	102:
	98	.section .fixup,"ax"
	99	103: addl %ecx,%edx /* ecx is zerorest also */
	100	jmp copy_user_handle_tail
	101	.previous
	102
	103	_ASM_EXTABLE(100b,103b)
	104	_ASM_EXTABLE(101b,103b)
	105	.endm
	106
709972b1	107	#else
548acf19 TL	108	# define _EXPAND_EXTABLE_HANDLE(x) #x
548acf19 TL	109	# define _ASM_EXTABLE_HANDLE(from, to, handler) \
535c0c34	110	" .pushsection \"__ex_table\",\"a\"\n" \
548acf19	111	" .balign 4\n" \
70627654 PA	112	" .long (" #from ") - .\n" \
70627654 PA	113	" .long (" #to ") - .\n" \
548acf19	114	" .long (" _EXPAND_EXTABLE_HANDLE(handler) ") - .\n" \
535c0c34 PA	115	" .popsection\n"
535c0c34 PA	116
548acf19 TL	117	# define _ASM_EXTABLE(from, to) \
	118	_ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
	119
	120	# define _ASM_EXTABLE_FAULT(from, to) \
	121	_ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
	122
	123	# define _ASM_EXTABLE_EX(from, to) \
	124	_ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)
	125
376e2424	126	/* For C file, we already have NOKPROBE_SYMBOL macro */
709972b1	127	#endif
a34746bc	128
0d3109a1 JP	129	#ifndef __ASSEMBLY__
	130	/*
	131	* This output constraint should be used for any inline asm which has a "call"
	132	* instruction. Otherwise the asm may be inserted before the frame pointer
	133	* gets set up by the containing function. If you forget to do this, objtool
	134	* may print a "call without frame pointer save/setup" warning.
	135	*/
	136	register unsigned int __asm_call_sp asm("esp");
	137	#define ASM_CALL_CONSTRAINT "+r" (__asm_call_sp)
	138	#endif
	139
1965aae3	140	#endif /* _ASM_X86_ASM_H */