bsd/ppc/signal.h

   1 /*
   2  * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1992, 1993 NeXT Computer, Inc.
  27  */
  28
  29 #ifndef _PPC_SIGNAL_
  30 #define _PPC_SIGNAL_ 1
  31
  32 #include <sys/appleapiopts.h>
  33
  34 #ifdef __APPLE_API_OBSOLETE
  35 typedef int sig_atomic_t;
  36
  37 /*
  38  * Machine-dependant flags used in sigvec call.
  39  */
  40 #define SV_SAVE_REGS    0x1000  /* Save all regs in sigcontext */
  41
  42 /*
  43  * regs_saved_t -- Describes which registers beyond what the kernel cares
  44  *                 about are saved to and restored from this sigcontext.
  45  *
  46  * The default is REGS_SAVED_CALLER, only the caller saved registers
  47  * are saved.  If the SV_SAVE_REGS flag was set when the signal
  48  * handler was registered with sigvec() then all the registers will be
  49  * saved in the sigcontext, and REGS_SAVED_ALL will be set.  The C
  50  * library uses REGS_SAVED_NONE in order to quickly restore kernel
  51  * state during a longjmp().
  52  */
  53 typedef enum {
  54         REGS_SAVED_NONE,                /* Only kernel managed regs restored */
  55         REGS_SAVED_CALLER,              /* "Caller saved" regs: rpc, a0-a7,
  56                                            t0-t4, at, lk0-lk1, xt1-xt20,
  57                                            xr0-xr1 */
  58         REGS_SAVED_ALL                  /* All registers */
  59 } regs_saved_t;
  60
  61
  62 /*
  63  * Information pushed on stack when a signal is delivered.
  64  * This is used by the kernel to restore state following
  65  * execution of the signal handler.  It is also made available
  66  * to the handler to allow it to properly restore state if
  67  * a non-standard exit is performed.
  68  */
  69 struct sigcontext {
  70     int         sc_onstack;     /* sigstack state to restore */
  71     int         sc_mask;        /* signal mask to restore */
  72         int             sc_ir;                  /* pc */
  73     int         sc_psw;         /* processor status word */
  74     int         sc_sp;          /* stack pointer if sc_regs == NULL */
  75         void    *sc_regs;               /* (kernel private) saved state */
  76 };
  77
  78 #endif /* __APPLE_API_OBSOLETE */
  79
  80 #endif /* _PPC_SIGNAL_ */
  81