sysdeps/unix/sysv/aix/sys/ucontext.h

   1 /* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #ifndef _SYS_UCONTEXT_H
  20 #define _SYS_UCONTEXT_H 1
  21
  22 #include <features.h>
  23 #include <bits/types.h>
  24 #include <bits/sigset.h>
  25
  26
  27 /* Alternate, preferred interface.  */
  28 typedef struct sigaltstack
  29   {
  30     void *ss_sp;
  31     size_t ss_size;
  32     int ss_flags;
  33     int __pad[4];
  34   } stack_t;
  35
  36
  37 /* Forward declaration of AIX type.  */
  38 typedef struct label_t label_t;
  39
  40
  41
  42 typedef unsigned int kvmhandle_t;
  43 typedef struct
  44   {
  45     unsigned long int __alloc;
  46     kvmhandle_t __srval[16];
  47   } adspace_t;
  48
  49
  50
  51 #define _NGPRS 32
  52 #define _NFPRS 32
  53
  54 struct __mstsafe
  55 {
  56   struct __mstsave *__prev;             /* Previous save area. */
  57   label_t *__kjmpbuf;                   /* Pointer to saved context.  */
  58   char *__stackfix;                     /* Stack fix pointer.  */
  59   char __intpri;                        /* Interrupt priority.  */
  60   char __backt;                         /* Back-track flag.  */
  61   char __rsvd[2];                       /* Reserved.  */
  62   __pid_t __curid;                      /* Copy of curid.  */
  63
  64   int __excp_type;                      /* Exception type for debugger.  */
  65   unsigned long int __iar;              /* Instruction address register.  */
  66   unsigned long int __msr;              /* Machine state register.  */
  67   unsigned long int __cr;               /* Condition register.  */
  68   unsigned long int __lr;               /* Link register.  */
  69   unsigned long int __ctr;              /* Count register.  */
  70   unsigned long int __xer;              /* Fixed point exception.  */
  71   unsigned long int __mq;               /* Multiply/quotient register.  */
  72   unsigned long int __tid;              /* TID register.  */
  73   unsigned long int __fpscr;            /* Floating point status reg.  */
  74   char __fpeu;                          /* Floating point ever used.  */
  75   char __fpinfo;                        /* Floating point status flags.  */
  76   char __pad[2];                        /* Pad to dword boundary.  */
  77                                         /* 1 implies state is in mstext */
  78   unsigned long int __except[5];        /* exception structure.  */
  79   char __pad1[4];                       /* Old bus field.  */
  80   unsigned long int __o_iar;            /* Old iar (for longjmp excpt).  */
  81   unsigned long int __o_toc;            /* Old toc (for longjmp excpt).  */
  82   unsigned long int __o_arg1;           /* Old arg1 (for longjmp excpt).  */
  83   unsigned long int __excbranch;        /* If not NULL, address to branch
  84                                            to on exception.  Used by
  85                                            assembler routines for low
  86                                            cost exception handling.  */
  87   unsigned long int __fpscrx;           /* Software extension to fpscr.  */
  88   unsigned long int __o_vaddr;          /* Saved vaddr for vmexception.  */
  89   unsigned long int __cachealign[7];    /* Reserved.  */
  90   adspace_t __as;                       /* Segment registers.  */
  91   unsigned long int __gpr[_NGPRS];      /* General purpose registers.  */
  92   double __fpr[_NFPRS];                 /* Floating point registers.  */
  93     };
  94
  95 typedef struct mcontext_t
  96   {
  97     struct __mstsafe __jmp_context;
  98   } mcontext_t;
  99
 100
 101 typedef struct ucontext_t
 102   {
 103     int __sc_onstack;           /* Sigstack state to restore.  */
 104     __sigset_t uc_sigmask;      /* The set of signals that are blocked when
 105                                    this context is active.  */
 106     int __sc_uerror;            /* u_error to restore.  */
 107     mcontext_t uc_mcontext;     /* Machine-specific image of saved context.  */
 108     struct ucontext_t *uc_link; /* context resumed after this one returns */
 109     stack_t uc_stack;           /* stack used by context */
 110     int __pad[4];
 111   } ucontext_t;
 112
 113 #endif /* sys/ucontext.h */