[mirror_ubuntu-focal-kernel.git] / arch / ia64 / include / uapi / asm / sigcontext.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _ASM_IA64_SIGCONTEXT_H
#define _ASM_IA64_SIGCONTEXT_H

/*
 * Copyright (C) 1998, 1999, 2001 Hewlett-Packard Co
 * Copyright (C) 1998, 1999, 2001 David Mosberger-Tang <davidm@hpl.hp.com>
 */

#include <asm/fpu.h>

#define IA64_SC_FLAG_ONSTACK_BIT		0	/* is handler running on signal stack? */
#define IA64_SC_FLAG_IN_SYSCALL_BIT		1	/* did signal interrupt a syscall? */
#define IA64_SC_FLAG_FPH_VALID_BIT		2	/* is state in f[32]-f[127] valid? */

#define IA64_SC_FLAG_ONSTACK		(1 << IA64_SC_FLAG_ONSTACK_BIT)
#define IA64_SC_FLAG_IN_SYSCALL		(1 << IA64_SC_FLAG_IN_SYSCALL_BIT)
#define IA64_SC_FLAG_FPH_VALID		(1 << IA64_SC_FLAG_FPH_VALID_BIT)

# ifndef __ASSEMBLY__

/*
 * Note on handling of register backing store: sc_ar_bsp contains the address that would
 * be found in ar.bsp after executing a "cover" instruction the context in which the
 * signal was raised.  If signal delivery required switching to an alternate signal stack
 * (sc_rbs_base is not NULL), the "dirty" partition (as it would exist after executing the
 * imaginary "cover" instruction) is backed by the *alternate* signal stack, not the
 * original one.  In this case, sc_rbs_base contains the base address of the new register
 * backing store.  The number of registers in the dirty partition can be calculated as:
 *
 *   ndirty = ia64_rse_num_regs(sc_rbs_base, sc_rbs_base + (sc_loadrs >> 16))
 *
 */

struct sigcontext {
	unsigned long		sc_flags;	/* see manifest constants above */
	unsigned long		sc_nat;		/* bit i == 1 iff scratch reg gr[i] is a NaT */
	stack_t			sc_stack;	/* previously active stack */

	unsigned long		sc_ip;		/* instruction pointer */
	unsigned long		sc_cfm;		/* current frame marker */
	unsigned long		sc_um;		/* user mask bits */
	unsigned long		sc_ar_rsc;	/* register stack configuration register */
	unsigned long		sc_ar_bsp;	/* backing store pointer */
	unsigned long		sc_ar_rnat;	/* RSE NaT collection register */
	unsigned long		sc_ar_ccv;	/* compare and exchange compare value register */
	unsigned long		sc_ar_unat;	/* ar.unat of interrupted context */
	unsigned long		sc_ar_fpsr;	/* floating-point status register */
	unsigned long		sc_ar_pfs;	/* previous function state */
	unsigned long		sc_ar_lc;	/* loop count register */
	unsigned long		sc_pr;		/* predicate registers */
	unsigned long		sc_br[8];	/* branch registers */
	/* Note: sc_gr[0] is used as the "uc_link" member of ucontext_t */
	unsigned long		sc_gr[32];	/* general registers (static partition) */
	struct ia64_fpreg	sc_fr[128];	/* floating-point registers */

	unsigned long		sc_rbs_base;	/* NULL or new base of sighandler's rbs */
	unsigned long		sc_loadrs;	/* see description above */

	unsigned long		sc_ar25;	/* cmp8xchg16 uses this */
	unsigned long		sc_ar26;	/* rsvd for scratch use */
	unsigned long		sc_rsvd[12];	/* reserved for future use */
	/*
	 * The mask must come last so we can increase _NSIG_WORDS
	 * without breaking binary compatibility.
	 */
	sigset_t		sc_mask;	/* signal mask to restore after handler returns */
};

# endif /* __ASSEMBLY__ */
#endif /* _ASM_IA64_SIGCONTEXT_H */
Commit	Line	Data
6f52b16c	1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
1da177e4 LT	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
	35	struct 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 */