bsd/ppc/signal.h

   1 /*
   2  * Copyright (c) 2000-2002 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
  26 #ifndef _PPC_SIGNAL_
  27 #define _PPC_SIGNAL_ 1
  28
  29 #include <sys/appleapiopts.h>
  30
  31 #ifdef __APPLE_API_OBSOLETE
  32 typedef int sig_atomic_t;
  33
  34 /*
  35  * Machine-dependant flags used in sigvec call.
  36  */
  37 #define SV_SAVE_REGS    0x1000  /* Save all regs in sigcontext */
  38
  39 /*
  40  * regs_saved_t -- Describes which registers beyond what the kernel cares
  41  *                 about are saved to and restored from this sigcontext.
  42  *
  43  * The default is REGS_SAVED_CALLER, only the caller saved registers
  44  * are saved.  If the SV_SAVE_REGS flag was set when the signal
  45  * handler was registered with sigvec() then all the registers will be
  46  * saved in the sigcontext, and REGS_SAVED_ALL will be set.  The C
  47  * library uses REGS_SAVED_NONE in order to quickly restore kernel
  48  * state during a longjmp().
  49  */
  50 typedef enum {
  51         REGS_SAVED_NONE,                /* Only kernel managed regs restored */
  52         REGS_SAVED_CALLER,              /* "Caller saved" regs: rpc, a0-a7,
  53                                            t0-t4, at, lk0-lk1, xt1-xt20,
  54                                            xr0-xr1 */
  55         REGS_SAVED_ALL                  /* All registers */
  56 } regs_saved_t;
  57
  58
  59 /*
  60  * Information pushed on stack when a signal is delivered.
  61  * This is used by the kernel to restore state following
  62  * execution of the signal handler.  It is also made available
  63  * to the handler to allow it to properly restore state if
  64  * a non-standard exit is performed.
  65  */
  66 struct sigcontext {
  67     int         sc_onstack;     /* sigstack state to restore */
  68     int         sc_mask;        /* signal mask to restore */
  69         int             sc_ir;                  /* pc */
  70     int         sc_psw;         /* processor status word */
  71     int         sc_sp;          /* stack pointer if sc_regs == NULL */
  72         void    *sc_regs;               /* (kernel private) saved state */
  73 };
  74
  75 #endif /* __APPLE_API_OBSOLETE */
  76
  77 #endif /* _PPC_SIGNAL_ */
  78