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/* Copyright (C) 1998, 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#ifndef _SYS_UCONTEXT_H
#define _SYS_UCONTEXT_H 1
#include <features.h>
#include <signal.h>
/*
* Location of the users' stored registers relative to R0.
* Usage is as an index into a gregset_t array or as u.u_ar0[XX].
*/
#define REG_PSR (0)
#define REG_PC (1)
#define REG_SPARE (2)
#define REG_WVALID (3)
#define REG_G1 (4)
#define REG_G2 (5)
#define REG_G3 (6)
#define REG_G4 (7)
#define REG_G5 (8)
#define REG_G6 (9)
#define REG_G7 (10)
#define REG_O0 (11)
#define REG_O1 (12)
#define REG_O2 (13)
#define REG_O3 (14)
#define REG_O4 (15)
#define REG_O5 (16)
#define REG_O6 (17)
#define REG_O7 (18)
#define REG_GLOBALS (19)
/*
* A gregset_t is defined as an array type for compatibility with the reference
* source. This is important due to differences in the way the C language
* treats arrays and structures as parameters.
*
* Note that NGREG is really (sizeof (struct regs) / sizeof (greg_t)),
* but that the ABI defines it absolutely to be 21 (resp. 19).
*/
#define NGREG 20
typedef int greg_t;
typedef greg_t gregset_t[NGREG];
/*
* The following structures define how a register window can appear on the
* stack. This structure is available (when required) through the `gwins'
* field of an mcontext (nested within ucontext). NIOS_MAXWINDOW is the
* maximum number of outstanding register windows defined in the NIOS
* architecture (*not* implementation).
*/
#define NIOS_MAXREGWINDOW 31 /* max windows in NIOS arch. */
struct rwindow
{
greg_t rw_local[8]; /* locals */
greg_t rw_in[8]; /* ins */
};
#define rw_fp rw_in[6] /* frame pointer */
#define rw_rtn rw_in[7] /* return address */
typedef struct gwindows
{
int wbcnt;
int *spbuf[NIOS_MAXREGWINDOW];
struct rwindow wbuf[NIOS_MAXREGWINDOW];
} gwindows_t;
typedef struct
{
gregset_t gregs; /* general register set */
gwindows_t *gwins; /* POSSIBLE pointer to register windows */
} mcontext_t;
/* Userlevel context. */
typedef struct ucontext
{
unsigned long uc_flags;
struct ucontext *uc_link;
__sigset_t uc_sigmask;
stack_t uc_stack;
mcontext_t uc_mcontext;
} ucontext_t;
#endif /* sys/ucontext.h */
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