[net-next-2.6.git] / arch / x86 / include / asm / linkage.h

#ifndef _ASM_X86_LINKAGE_H
#define _ASM_X86_LINKAGE_H

#undef notrace
#define notrace __attribute__((no_instrument_function))

#ifdef CONFIG_X86_64
#define __ALIGN .p2align 4,,15
#define __ALIGN_STR ".p2align 4,,15"
#endif

#ifdef CONFIG_X86_32
#define asmlinkage CPP_ASMLINKAGE __attribute__((regparm(0)))
/*
 * For 32-bit UML - mark functions implemented in assembly that use
 * regparm input parameters:
 */
#define asmregparm __attribute__((regparm(3)))

/*
 * Make sure the compiler doesn't do anything stupid with the
 * arguments on the stack - they are owned by the *caller*, not
 * the callee. This just fools gcc into not spilling into them,
 * and keeps it from doing tailcall recursion and/or using the
 * stack slots for temporaries, since they are live and "used"
 * all the way to the end of the function.
 *
 * NOTE! On x86-64, all the arguments are in registers, so this
 * only matters on a 32-bit kernel.
 */
#define asmlinkage_protect(n, ret, args...) \
	__asmlinkage_protect##n(ret, ##args)
#define __asmlinkage_protect_n(ret, args...) \
	__asm__ __volatile__ ("" : "=r" (ret) : "0" (ret), ##args)
#define __asmlinkage_protect0(ret) \
	__asmlinkage_protect_n(ret)
#define __asmlinkage_protect1(ret, arg1) \
	__asmlinkage_protect_n(ret, "g" (arg1))
#define __asmlinkage_protect2(ret, arg1, arg2) \
	__asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2))
#define __asmlinkage_protect3(ret, arg1, arg2, arg3) \
	__asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3))
#define __asmlinkage_protect4(ret, arg1, arg2, arg3, arg4) \
	__asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3), \
			      "g" (arg4))
#define __asmlinkage_protect5(ret, arg1, arg2, arg3, arg4, arg5) \
	__asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3), \
			      "g" (arg4), "g" (arg5))
#define __asmlinkage_protect6(ret, arg1, arg2, arg3, arg4, arg5, arg6) \
	__asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3), \
			      "g" (arg4), "g" (arg5), "g" (arg6))

#endif

#define GLOBAL(name)	\
	.globl name;	\
	name:

#ifdef CONFIG_X86_ALIGNMENT_16
#define __ALIGN .align 16,0x90
#define __ALIGN_STR ".align 16,0x90"
#endif

/*
 * to check ENTRY_X86/END_X86 and
 * KPROBE_ENTRY_X86/KPROBE_END_X86
 * unbalanced-missed-mixed appearance
 */
#define __set_entry_x86		.set ENTRY_X86_IN, 0
#define __unset_entry_x86	.set ENTRY_X86_IN, 1
#define __set_kprobe_x86	.set KPROBE_X86_IN, 0
#define __unset_kprobe_x86	.set KPROBE_X86_IN, 1

#define __macro_err_x86 .error "ENTRY_X86/KPROBE_X86 unbalanced,missed,mixed"

#define __check_entry_x86	\
	.ifdef ENTRY_X86_IN;	\
	.ifeq ENTRY_X86_IN;	\
	__macro_err_x86;	\
	.abort;			\
	.endif;			\
	.endif

#define __check_kprobe_x86	\
	.ifdef KPROBE_X86_IN;	\
	.ifeq KPROBE_X86_IN;	\
	__macro_err_x86;	\
	.abort;			\
	.endif;			\
	.endif

#define __check_entry_kprobe_x86	\
	__check_entry_x86;		\
	__check_kprobe_x86

#define ENTRY_KPROBE_FINAL_X86 __check_entry_kprobe_x86

#define ENTRY_X86(name)			\
	__check_entry_kprobe_x86;	\
	__set_entry_x86;		\
	.globl name;			\
	__ALIGN;			\
	name:

#define END_X86(name)			\
	__unset_entry_x86;		\
	__check_entry_kprobe_x86;	\
	.size name, .-name

#define KPROBE_ENTRY_X86(name)		\
	__check_entry_kprobe_x86;	\
	__set_kprobe_x86;		\
	.pushsection .kprobes.text, "ax"; \
	.globl name;			\
	__ALIGN;			\
	name:

#define KPROBE_END_X86(name)		\
	__unset_kprobe_x86;		\
	__check_entry_kprobe_x86;	\
	.size name, .-name;		\
	.popsection

#endif /* _ASM_X86_LINKAGE_H */
Commit	Line	Data
1965aae3 PA	1	#ifndef _ASM_X86_LINKAGE_H
1965aae3 PA	2	#define _ASM_X86_LINKAGE_H
82f74e71	3
78a9909a IM	4	#undef notrace
	5	#define notrace __attribute__((no_instrument_function))
	6
82f74e71 HH	7	#ifdef CONFIG_X86_64
	8	#define __ALIGN .p2align 4,,15
	9	#define __ALIGN_STR ".p2align 4,,15"
	10	#endif
	11
96a388de	12	#ifdef CONFIG_X86_32
82f74e71	13	#define asmlinkage CPP_ASMLINKAGE __attribute__((regparm(0)))
d50efc6c IM	14	/*
	15	* For 32-bit UML - mark functions implemented in assembly that use
	16	* regparm input parameters:
	17	*/
	18	#define asmregparm __attribute__((regparm(3)))
54a01510	19
d10d89ec LT	20	/*
	21	* Make sure the compiler doesn't do anything stupid with the
	22	* arguments on the stack - they are owned by the caller, not
	23	* the callee. This just fools gcc into not spilling into them,
	24	* and keeps it from doing tailcall recursion and/or using the
	25	* stack slots for temporaries, since they are live and "used"
	26	* all the way to the end of the function.
	27	*
	28	* NOTE! On x86-64, all the arguments are in registers, so this
	29	* only matters on a 32-bit kernel.
	30	*/
54a01510 RM	31	#define asmlinkage_protect(n, ret, args...) \
	32	__asmlinkage_protect##n(ret, ##args)
	33	#define __asmlinkage_protect_n(ret, args...) \
	34	__asm__ __volatile__ ("" : "=r" (ret) : "0" (ret), ##args)
	35	#define __asmlinkage_protect0(ret) \
	36	__asmlinkage_protect_n(ret)
	37	#define __asmlinkage_protect1(ret, arg1) \
	38	__asmlinkage_protect_n(ret, "g" (arg1))
	39	#define __asmlinkage_protect2(ret, arg1, arg2) \
	40	__asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2))
	41	#define __asmlinkage_protect3(ret, arg1, arg2, arg3) \
	42	__asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3))
	43	#define __asmlinkage_protect4(ret, arg1, arg2, arg3, arg4) \
	44	__asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3), \
	45	"g" (arg4))
	46	#define __asmlinkage_protect5(ret, arg1, arg2, arg3, arg4, arg5) \
	47	__asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3), \
	48	"g" (arg4), "g" (arg5))
	49	#define __asmlinkage_protect6(ret, arg1, arg2, arg3, arg4, arg5, arg6) \
	50	__asmlinkage_protect_n(ret, "g" (arg1), "g" (arg2), "g" (arg3), \
	51	"g" (arg4), "g" (arg5), "g" (arg6))
	52
82f74e71 HH	53	#endif
82f74e71 HH	54
95695547 CG	55	#define GLOBAL(name) \
	56	.globl name; \
	57	name:
	58
82f74e71 HH	59	#ifdef CONFIG_X86_ALIGNMENT_16
	60	#define __ALIGN .align 16,0x90
	61	#define __ALIGN_STR ".align 16,0x90"
	62	#endif
	63
3b6c52b5 CG	64	/*
	65	* to check ENTRY_X86/END_X86 and
	66	* KPROBE_ENTRY_X86/KPROBE_END_X86
	67	* unbalanced-missed-mixed appearance
	68	*/
	69	#define __set_entry_x86 .set ENTRY_X86_IN, 0
	70	#define __unset_entry_x86 .set ENTRY_X86_IN, 1
	71	#define __set_kprobe_x86 .set KPROBE_X86_IN, 0
	72	#define __unset_kprobe_x86 .set KPROBE_X86_IN, 1
	73
	74	#define __macro_err_x86 .error "ENTRY_X86/KPROBE_X86 unbalanced,missed,mixed"
	75
	76	#define __check_entry_x86 \
	77	.ifdef ENTRY_X86_IN; \
	78	.ifeq ENTRY_X86_IN; \
	79	__macro_err_x86; \
	80	.abort; \
	81	.endif; \
	82	.endif
	83
	84	#define __check_kprobe_x86 \
	85	.ifdef KPROBE_X86_IN; \
	86	.ifeq KPROBE_X86_IN; \
	87	__macro_err_x86; \
	88	.abort; \
	89	.endif; \
	90	.endif
	91
	92	#define __check_entry_kprobe_x86 \
	93	__check_entry_x86; \
	94	__check_kprobe_x86
	95
	96	#define ENTRY_KPROBE_FINAL_X86 __check_entry_kprobe_x86
	97
	98	#define ENTRY_X86(name) \
	99	__check_entry_kprobe_x86; \
	100	__set_entry_x86; \
	101	.globl name; \
	102	__ALIGN; \
	103	name:
	104
	105	#define END_X86(name) \
	106	__unset_entry_x86; \
	107	__check_entry_kprobe_x86; \
	108	.size name, .-name
	109
	110	#define KPROBE_ENTRY_X86(name) \
	111	__check_entry_kprobe_x86; \
	112	__set_kprobe_x86; \
	113	.pushsection .kprobes.text, "ax"; \
	114	.globl name; \
	115	__ALIGN; \
	116	name:
	117
	118	#define KPROBE_END_X86(name) \
	119	__unset_kprobe_x86; \
	120	__check_entry_kprobe_x86; \
	121	.size name, .-name; \
	122	.popsection
	123
1965aae3	124	#endif /* _ASM_X86_LINKAGE_H */
82f74e71	125