/* 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 */