1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2#ifndef _ASM_IA64_SIGCONTEXT_H
3#define _ASM_IA64_SIGCONTEXT_H
4
5/*
6 * Copyright (C) 1998, 1999, 2001 Hewlett-Packard Co
7 * Copyright (C) 1998, 1999, 2001 David Mosberger-Tang <davidm@hpl.hp.com>
8 */
9
10#include <asm/fpu.h>
11
12#define IA64_SC_FLAG_ONSTACK_BIT		0	/* is handler running on signal stack? */
13#define IA64_SC_FLAG_IN_SYSCALL_BIT		1	/* did signal interrupt a syscall? */
14#define IA64_SC_FLAG_FPH_VALID_BIT		2	/* is state in f[32]-f[127] valid? */
15
16#define IA64_SC_FLAG_ONSTACK		(1 << IA64_SC_FLAG_ONSTACK_BIT)
17#define IA64_SC_FLAG_IN_SYSCALL		(1 << IA64_SC_FLAG_IN_SYSCALL_BIT)
18#define IA64_SC_FLAG_FPH_VALID		(1 << IA64_SC_FLAG_FPH_VALID_BIT)
19
20# ifndef __ASSEMBLY__
21
22/*
23 * Note on handling of register backing store: sc_ar_bsp contains the address that would
24 * be found in ar.bsp after executing a "cover" instruction the context in which the
25 * signal was raised.  If signal delivery required switching to an alternate signal stack
26 * (sc_rbs_base is not NULL), the "dirty" partition (as it would exist after executing the
27 * imaginary "cover" instruction) is backed by the *alternate* signal stack, not the
28 * original one.  In this case, sc_rbs_base contains the base address of the new register
29 * backing store.  The number of registers in the dirty partition can be calculated as:
30 *
31 *   ndirty = ia64_rse_num_regs(sc_rbs_base, sc_rbs_base + (sc_loadrs >> 16))
32 *
33 */
34
35struct sigcontext {
36	unsigned long		sc_flags;	/* see manifest constants above */
37	unsigned long		sc_nat;		/* bit i == 1 iff scratch reg gr[i] is a NaT */
38	stack_t			sc_stack;	/* previously active stack */
39
40	unsigned long		sc_ip;		/* instruction pointer */
41	unsigned long		sc_cfm;		/* current frame marker */
42	unsigned long		sc_um;		/* user mask bits */
43	unsigned long		sc_ar_rsc;	/* register stack configuration register */
44	unsigned long		sc_ar_bsp;	/* backing store pointer */
45	unsigned long		sc_ar_rnat;	/* RSE NaT collection register */
46	unsigned long		sc_ar_ccv;	/* compare and exchange compare value register */
47	unsigned long		sc_ar_unat;	/* ar.unat of interrupted context */
48	unsigned long		sc_ar_fpsr;	/* floating-point status register */
49	unsigned long		sc_ar_pfs;	/* previous function state */
50	unsigned long		sc_ar_lc;	/* loop count register */
51	unsigned long		sc_pr;		/* predicate registers */
52	unsigned long		sc_br[8];	/* branch registers */
53	/* Note: sc_gr[0] is used as the "uc_link" member of ucontext_t */
54	unsigned long		sc_gr[32];	/* general registers (static partition) */
55	struct ia64_fpreg	sc_fr[128];	/* floating-point registers */
56
57	unsigned long		sc_rbs_base;	/* NULL or new base of sighandler's rbs */
58	unsigned long		sc_loadrs;	/* see description above */
59
60	unsigned long		sc_ar25;	/* cmp8xchg16 uses this */
61	unsigned long		sc_ar26;	/* rsvd for scratch use */
62	unsigned long		sc_rsvd[12];	/* reserved for future use */
63	/*
64	 * The mask must come last so we can increase _NSIG_WORDS
65	 * without breaking binary compatibility.
66	 */
67	sigset_t		sc_mask;	/* signal mask to restore after handler returns */
68};
69
70# endif /* __ASSEMBLY__ */
71#endif /* _ASM_IA64_SIGCONTEXT_H */
72