1 /* Copyright (C) 1998, 1999 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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
19 #ifndef _SYS_UCONTEXT_H
20 #define _SYS_UCONTEXT_H 1
25 * Location of the users' stored registers relative to R0.
26 * Usage is as an index into a gregset_t array or as u.u_ar0[XX].
31 #define REG_WVALID (3)
47 #define REG_GLOBALS (19)
50 * A gregset_t is defined as an array type for compatibility with the reference
51 * source. This is important due to differences in the way the C language
52 * treats arrays and structures as parameters.
54 * Note that NGREG is really (sizeof (struct regs) / sizeof (greg_t)),
55 * but that the ABI defines it absolutely to be 21 (resp. 19).
61 typedef greg_t gregset_t[NGREG];
64 * The following structures define how a register window can appear on the
65 * stack. This structure is available (when required) through the `gwins'
66 * field of an mcontext (nested within ucontext). NIOS_MAXWINDOW is the
67 * maximum number of outstanding register windows defined in the NIOS
68 * architecture (*not* implementation).
70 #define NIOS_MAXREGWINDOW 31 /* max windows in NIOS arch. */
73 greg_t rw_local[8]; /* locals */
74 greg_t rw_in[8]; /* ins */
77 #define rw_fp rw_in[6] /* frame pointer */
78 #define rw_rtn rw_in[7] /* return address */
80 typedef struct gwindows
83 int *spbuf[NIOS_MAXREGWINDOW];
84 struct rwindow wbuf[NIOS_MAXREGWINDOW];
89 gregset_t gregs; /* general register set */
90 gwindows_t *gwins; /* POSSIBLE pointer to register windows */
94 /* Userlevel context. */
95 typedef struct ucontext
97 unsigned long uc_flags;
98 struct ucontext *uc_link;
99 __sigset_t uc_sigmask;
101 mcontext_t uc_mcontext;
104 #endif /* sys/ucontext.h */