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Annotation of kernel/bsd/ppc/signal.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
                      7:  * Reserved.  This file contains Original Code and/or Modifications of
                      8:  * Original Code as defined in and that are subject to the Apple Public
                      9:  * Source License Version 1.1 (the "License").  You may not use this file
                     10:  * except in compliance with the License.  Please obtain a copy of the
                     11:  * License at http://www.apple.com/publicsource and read it before using
                     12:  * this file.
                     13:  * 
                     14:  * The Original Code and all software distributed under the License are
                     15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     19:  * License for the specific language governing rights and limitations
                     20:  * under the License.
                     21:  * 
                     22:  * @APPLE_LICENSE_HEADER_END@
                     23:  */
                     24: 
                     25: /*
                     26:  * Copyright (c) 1992, 1993 NeXT Computer, Inc.
                     27:  *
                     28:  * HISTORY
                     29:  *
                     30:  *     Machine specific signal information.
                     31:  *
                     32:  * HISTORY
                     33:  * 25-MAR-97  Umesh Vaishampayan ([email protected])
                     34:  *     Ported from m98k and hppa.
                     35:  *
                     36:  * 13-Jan-92  Peter King (king) at NeXT Computer, Inc.
                     37:  *     Filled out struct sigcontext to hold all registers.
                     38:  *     Added regs_saved_t to specify which regs stored in the
                     39:  *     sigcontext are valid.
                     40:  *
                     41:  * 09-Nov-92  Ben Fathi (benf) at NeXT, Inc.
                     42:  *     Ported to m98k.
                     43:  *
                     44:  * 09-May-91  Mike DeMoney (mike) at NeXT, Inc.
                     45:  *     Ported to m88k.
                     46:  */
                     47: 
                     48: #ifndef        _PPC_SIGNAL_
                     49: #define        _PPC_SIGNAL_ 1
                     50: 
                     51: typedef int sig_atomic_t; 
                     52: 
                     53: /*
                     54:  * Machine-dependant flags used in sigvec call.
                     55:  */
                     56: #define        SV_SAVE_REGS    0x1000  /* Save all regs in sigcontext */
                     57: 
                     58: /*
                     59:  * regs_saved_t -- Describes which registers beyond what the kernel cares
                     60:  *                about are saved to and restored from this sigcontext.
                     61:  *
                     62:  * The default is REGS_SAVED_CALLER, only the caller saved registers
                     63:  * are saved.  If the SV_SAVE_REGS flag was set when the signal
                     64:  * handler was registered with sigvec() then all the registers will be
                     65:  * saved in the sigcontext, and REGS_SAVED_ALL will be set.  The C
                     66:  * library uses REGS_SAVED_NONE in order to quickly restore kernel
                     67:  * state during a longjmp().
                     68:  */
                     69: typedef enum {
                     70:        REGS_SAVED_NONE,                /* Only kernel managed regs restored */
                     71:        REGS_SAVED_CALLER,              /* "Caller saved" regs: rpc, a0-a7,
                     72:                                           t0-t4, at, lk0-lk1, xt1-xt20,
                     73:                                           xr0-xr1 */
                     74:        REGS_SAVED_ALL                  /* All registers */
                     75: } regs_saved_t;
                     76: 
                     77: 
                     78: /*
                     79:  * Information pushed on stack when a signal is delivered.
                     80:  * This is used by the kernel to restore state following
                     81:  * execution of the signal handler.  It is also made available
                     82:  * to the handler to allow it to properly restore state if
                     83:  * a non-standard exit is performed.
                     84:  */
                     85: struct sigcontext {
                     86:     int                sc_onstack;     /* sigstack state to restore */
                     87:     int                sc_mask;        /* signal mask to restore */
                     88:        int             sc_ir;                  /* pc */
                     89:     int                sc_psw;         /* processor status word */
                     90:     int                sc_sp;          /* stack pointer if sc_regs == NULL */
                     91:        void    *sc_regs;               /* (kernel private) saved state */
                     92: };
                     93: 
                     94: #endif /* _PPC_SIGNAL_ */
                     95: 

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