xref: /linux/arch/x86/include/asm/signal.h (revision ef815d2cba782e96b9aad9483523d474ed41c62a)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_SIGNAL_H
3 #define _ASM_X86_SIGNAL_H
4 
5 #ifndef __ASSEMBLY__
6 #include <linux/linkage.h>
7 
8 /* Most things should be clean enough to redefine this at will, if care
9    is taken to make libc match.  */
10 
11 #define _NSIG		64
12 
13 #ifdef __i386__
14 # define _NSIG_BPW	32
15 #else
16 # define _NSIG_BPW	64
17 #endif
18 
19 #define _NSIG_WORDS	(_NSIG / _NSIG_BPW)
20 
21 typedef unsigned long old_sigset_t;		/* at least 32 bits */
22 
23 typedef struct {
24 	unsigned long sig[_NSIG_WORDS];
25 } sigset_t;
26 
27 /* non-uapi in-kernel SA_FLAGS for those indicates ABI for a signal frame */
28 #define SA_IA32_ABI	0x02000000u
29 #define SA_X32_ABI	0x01000000u
30 
31 #endif /* __ASSEMBLY__ */
32 #include <uapi/asm/signal.h>
33 #ifndef __ASSEMBLY__
34 
35 #define __ARCH_HAS_SA_RESTORER
36 
37 #include <asm/asm.h>
38 #include <uapi/asm/sigcontext.h>
39 
40 #ifdef __i386__
41 
42 #define __HAVE_ARCH_SIG_BITOPS
43 
44 #define sigaddset(set,sig)		    \
45 	(__builtin_constant_p(sig)	    \
46 	 ? __const_sigaddset((set), (sig))  \
47 	 : __gen_sigaddset((set), (sig)))
48 
49 static inline void __gen_sigaddset(sigset_t *set, int _sig)
50 {
51 	asm("btsl %1,%0" : "+m"(*set) : "Ir"(_sig - 1) : "cc");
52 }
53 
54 static inline void __const_sigaddset(sigset_t *set, int _sig)
55 {
56 	unsigned long sig = _sig - 1;
57 	set->sig[sig / _NSIG_BPW] |= 1 << (sig % _NSIG_BPW);
58 }
59 
60 #define sigdelset(set, sig)		    \
61 	(__builtin_constant_p(sig)	    \
62 	 ? __const_sigdelset((set), (sig))  \
63 	 : __gen_sigdelset((set), (sig)))
64 
65 
66 static inline void __gen_sigdelset(sigset_t *set, int _sig)
67 {
68 	asm("btrl %1,%0" : "+m"(*set) : "Ir"(_sig - 1) : "cc");
69 }
70 
71 static inline void __const_sigdelset(sigset_t *set, int _sig)
72 {
73 	unsigned long sig = _sig - 1;
74 	set->sig[sig / _NSIG_BPW] &= ~(1 << (sig % _NSIG_BPW));
75 }
76 
77 static inline int __const_sigismember(sigset_t *set, int _sig)
78 {
79 	unsigned long sig = _sig - 1;
80 	return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
81 }
82 
83 static inline int __gen_sigismember(sigset_t *set, int _sig)
84 {
85 	bool ret;
86 	asm("btl %2,%1" CC_SET(c)
87 	    : CC_OUT(c) (ret) : "m"(*set), "Ir"(_sig-1));
88 	return ret;
89 }
90 
91 #define sigismember(set, sig)			\
92 	(__builtin_constant_p(sig)		\
93 	 ? __const_sigismember((set), (sig))	\
94 	 : __gen_sigismember((set), (sig)))
95 
96 struct pt_regs;
97 
98 #else /* __i386__ */
99 
100 #undef __HAVE_ARCH_SIG_BITOPS
101 
102 #endif /* !__i386__ */
103 
104 #endif /* __ASSEMBLY__ */
105 #endif /* _ASM_X86_SIGNAL_H */
106