#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 <[email protected]>
*/

#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 */