1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_LINKAGE_H
3#define __ASM_LINKAGE_H
4
5#define __ALIGN .align 4
6#define __ALIGN_STR ".align 4"
7
8/*
9 * Make sure the compiler doesn't do anything stupid with the
10 * arguments on the stack - they are owned by the *caller*, not
11 * the callee. This just fools gcc into not spilling into them,
12 * and keeps it from doing tailcall recursion and/or using the
13 * stack slots for temporaries, since they are live and "used"
14 * all the way to the end of the function.
15 */
16#define asmlinkage_protect(n, ret, args...) \
17	__asmlinkage_protect##n(ret, ##args)
18#define __asmlinkage_protect_n(ret, args...) \
19	__asm__ __volatile__ ("" : "=r" (ret) : "0" (ret), ##args)
20#define __asmlinkage_protect0(ret) \
21	__asmlinkage_protect_n(ret)
22#define __asmlinkage_protect1(ret, arg1) \
23	__asmlinkage_protect_n(ret, "m" (arg1))
24#define __asmlinkage_protect2(ret, arg1, arg2) \
25	__asmlinkage_protect_n(ret, "m" (arg1), "m" (arg2))
26#define __asmlinkage_protect3(ret, arg1, arg2, arg3) \
27	__asmlinkage_protect_n(ret, "m" (arg1), "m" (arg2), "m" (arg3))
28#define __asmlinkage_protect4(ret, arg1, arg2, arg3, arg4) \
29	__asmlinkage_protect_n(ret, "m" (arg1), "m" (arg2), "m" (arg3), \
30			      "m" (arg4))
31#define __asmlinkage_protect5(ret, arg1, arg2, arg3, arg4, arg5) \
32	__asmlinkage_protect_n(ret, "m" (arg1), "m" (arg2), "m" (arg3), \
33			      "m" (arg4), "m" (arg5))
34#define __asmlinkage_protect6(ret, arg1, arg2, arg3, arg4, arg5, arg6) \
35	__asmlinkage_protect_n(ret, "m" (arg1), "m" (arg2), "m" (arg3), \
36			      "m" (arg4), "m" (arg5), "m" (arg6))
37
38#endif
39