xnu-792.13.8.tar.gz

[apple/xnu.git] / bsd / ppc / signal.h

/*
 * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code 
 * as defined in and that are subject to the Apple Public Source License 
 * Version 2.0 (the 'License'). You may not use this file except in 
 * compliance with the License.  The rights granted to you under the 
 * License may not be used to create, or enable the creation or 
 * redistribution of, unlawful or unlicensed copies of an Apple operating 
 * system, or to circumvent, violate, or enable the circumvention or 
 * violation of, any terms of an Apple operating system software license 
 * agreement.
 *
 * Please obtain a copy of the License at 
 * http://www.opensource.apple.com/apsl/ and read it before using this 
 * file.
 *
 * The Original Code and all software distributed under the License are 
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 
 * Please see the License for the specific language governing rights and 
 * limitations under the License.
 *
 * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
 */
/*
 * Copyright (c) 1992, 1993 NeXT Computer, Inc.
 */

#ifndef	_PPC_SIGNAL_
#define	_PPC_SIGNAL_ 1

#include <sys/appleapiopts.h>

#ifdef __APPLE_API_OBSOLETE
typedef int sig_atomic_t; 

/*
 * Machine-dependant flags used in sigvec call.
 */
#define	SV_SAVE_REGS	0x1000	/* Save all regs in sigcontext */

/*
 * regs_saved_t -- Describes which registers beyond what the kernel cares
 *		   about are saved to and restored from this sigcontext.
 *
 * The default is REGS_SAVED_CALLER, only the caller saved registers
 * are saved.  If the SV_SAVE_REGS flag was set when the signal
 * handler was registered with sigvec() then all the registers will be
 * saved in the sigcontext, and REGS_SAVED_ALL will be set.  The C
 * library uses REGS_SAVED_NONE in order to quickly restore kernel
 * state during a longjmp().
 */
typedef enum {
	REGS_SAVED_NONE,		/* Only kernel managed regs restored */
	REGS_SAVED_CALLER,		/* "Caller saved" regs: rpc, a0-a7,
					   t0-t4, at, lk0-lk1, xt1-xt20,
					   xr0-xr1 */
	REGS_SAVED_ALL			/* All registers */
} regs_saved_t;


/*
 * Information pushed on stack when a signal is delivered.
 * This is used by the kernel to restore state following
 * execution of the signal handler.  It is also made available
 * to the handler to allow it to properly restore state if
 * a non-standard exit is performed.
 */
struct sigcontext32 {
    int		sc_onstack;     /* sigstack state to restore */
    int		sc_mask;        /* signal mask to restore */
    int		sc_ir;			/* pc */
    int		sc_psw;         /* processor status word */
    int		sc_sp;      	/* stack pointer if sc_regs == NULL */
    void	*sc_regs;		/* (kernel private) saved state */
};

struct sigcontext64 {
    int		sc_onstack;     /* sigstack state to restore */
    int		sc_mask;        /* signal mask to restore */
    long long	sc_ir;		/* pc */
    long long	sc_psw;         /* processor status word */
    long long	sc_sp;      	/* stack pointer if sc_regs == NULL */
    void	*sc_regs;	/* (kernel private) saved state */
};

/*
 * LP64todo - Have to decide how to handle this.
 * For now, just duplicate the 32-bit context as the generic one.
 */
struct sigcontext {
    int		sc_onstack;     /* sigstack state to restore */
    int		sc_mask;        /* signal mask to restore */
    int		sc_ir;			/* pc */
    int		sc_psw;         /* processor status word */
    int		sc_sp;      	/* stack pointer if sc_regs == NULL */
    void	*sc_regs;		/* (kernel private) saved state */
};

#endif /* __APPLE_API_OBSOLETE */

#endif /* _PPC_SIGNAL_ */