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/* Copyright (C) 1998, 1999, 2002, 2004, 2005 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, see
<http://www.gnu.org/licenses/>. */
#ifndef _SYS_UCONTEXT_H
#define _SYS_UCONTEXT_H 1
#include <features.h>
#include <signal.h>
/* We need the signal context definitions even if they are not used
included in <signal.h>. */
#include <bits/sigcontext.h>
/* Number of general registers. */
# define NGREG 48
/* Container for all general registers. */
typedef unsigned long gregset_t[NGREG];
/* Container for floating-point registers and status */
typedef struct _libc_fpstate
{
double fpregs[32];
double fpscr;
unsigned int _pad[2];
} fpregset_t;
/* Container for Altivec/VMX registers and status.
Needs to be aligned on a 16-byte boundary. */
typedef struct _libc_vrstate
{
unsigned int vrregs[32][4];
unsigned int vrsave;
unsigned int _pad[2];
unsigned int vscr;
} vrregset_t;
/* Context to describe whole processor state. */
typedef struct
{
gregset_t gregs;
fpregset_t fpregs;
vrregset_t vrregs __attribute__((__aligned__(16)));
} mcontext_t;
/* Userlevel context. */
typedef struct ucontext
{
unsigned long int uc_flags;
struct ucontext *uc_link;
stack_t uc_stack;
/*
* These fields are set up this way to maximize source and
* binary compatibility with code written for the old
* ucontext_t definition, which didn't include space for the
* registers.
*
* Different versions of the kernel have stored the registers on
* signal delivery at different offsets from the ucontext struct.
* Programs should thus use the uc_mcontext.uc_regs pointer to
* find where the registers are actually stored. The registers
* will be stored within the ucontext_t struct but not necessarily
* at a fixed address. As a side-effect, this lets us achieve
* 16-byte alignment for the register storage space if the
* Altivec registers are to be saved, without requiring 16-byte
* alignment on the whole ucontext_t.
*
* The uc_mcontext.regs field is included for source compatibility
* with programs written against the older ucontext_t definition,
* and its name should therefore not change. The uc_pad field
* is for binary compatibility with programs compiled against the
* old ucontext_t; it ensures that uc_mcontext.regs and uc_sigmask
* are at the same offset as previously.
*/
int uc_pad[7];
union uc_regs_ptr {
struct pt_regs *regs;
mcontext_t *uc_regs;
} uc_mcontext;
sigset_t uc_sigmask;
char uc_reg_space[sizeof(mcontext_t) + 12]; /* last for extensibility */
} ucontext_t;
#endif /* sys/ucontext.h */
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