bsd/ppc/signal.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1992, 1993 NeXT Computer, Inc.
  24  *
  25  * HISTORY
  26  *
  27  *      Machine specific signal information.
  28  *
  29  * HISTORY
  30  * 25-MAR-97  Umesh Vaishampayan (umeshv@NeXT.com)
  31  *      Ported from m98k and hppa.
  32  *
  33  * 13-Jan-92  Peter King (king) at NeXT Computer, Inc.
  34  *      Filled out struct sigcontext to hold all registers.
  35  *      Added regs_saved_t to specify which regs stored in the
  36  *      sigcontext are valid.
  37  *
  38  * 09-Nov-92  Ben Fathi (benf) at NeXT, Inc.
  39  *      Ported to m98k.
  40  *
  41  * 09-May-91  Mike DeMoney (mike) at NeXT, Inc.
  42  *      Ported to m88k.
  43  */
  44
  45 #ifndef _PPC_SIGNAL_
  46 #define _PPC_SIGNAL_ 1
  47
  48 typedef int sig_atomic_t;
  49
  50 /*
  51  * Machine-dependant flags used in sigvec call.
  52  */
  53 #define SV_SAVE_REGS    0x1000  /* Save all regs in sigcontext */
  54
  55 /*
  56  * regs_saved_t -- Describes which registers beyond what the kernel cares
  57  *                 about are saved to and restored from this sigcontext.
  58  *
  59  * The default is REGS_SAVED_CALLER, only the caller saved registers
  60  * are saved.  If the SV_SAVE_REGS flag was set when the signal
  61  * handler was registered with sigvec() then all the registers will be
  62  * saved in the sigcontext, and REGS_SAVED_ALL will be set.  The C
  63  * library uses REGS_SAVED_NONE in order to quickly restore kernel
  64  * state during a longjmp().
  65  */
  66 typedef enum {
  67         REGS_SAVED_NONE,                /* Only kernel managed regs restored */
  68         REGS_SAVED_CALLER,              /* "Caller saved" regs: rpc, a0-a7,
  69                                            t0-t4, at, lk0-lk1, xt1-xt20,
  70                                            xr0-xr1 */
  71         REGS_SAVED_ALL                  /* All registers */
  72 } regs_saved_t;
  73
  74
  75 /*
  76  * Information pushed on stack when a signal is delivered.
  77  * This is used by the kernel to restore state following
  78  * execution of the signal handler.  It is also made available
  79  * to the handler to allow it to properly restore state if
  80  * a non-standard exit is performed.
  81  */
  82 struct sigcontext {
  83     int         sc_onstack;     /* sigstack state to restore */
  84     int         sc_mask;        /* signal mask to restore */
  85         int             sc_ir;                  /* pc */
  86     int         sc_psw;         /* processor status word */
  87     int         sc_sp;          /* stack pointer if sc_regs == NULL */
  88         void    *sc_regs;               /* (kernel private) saved state */
  89 };
  90
  91 #endif /* _PPC_SIGNAL_ */
  92