Subversion Repositories or1k

#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 */