c5c6b7b38e
struct sigcontext and ucontext_t/mcontext_t are defined in such
a way that both (ie struct sigcontext and ucontext_t) can be
passed on to sigreturn. The signal handler is still given a
ucontext_t for maximum flexibility.
For backward compatibility sigreturn restores the state for the
alternate signal stack from sigcontext.sc_onstack and not from
ucontext_t.uc_stack. A good way to determine which value the
application has set and thus which value to use, is still open
for discussion.
NOTE: This change should only affect those binaries that use
sigcontext and/or ucontext_t. In the source tree itself
this is only doscmd. Recompilation is required for those
applications.
This commit also fixes a lot of style bugs without hopefully
adding new ones.
NOTE: struct sigaltstack.ss_size now has type size_t again. For
some reason I changed that into unsigned int.
Parts submitted by: bde
sigaltstack bug found by: bde
94 lines
3.5 KiB
C
94 lines
3.5 KiB
C
/* $FreeBSD$ */
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/* From: NetBSD: signal.h,v 1.3 1997/04/06 08:47:43 cgd Exp */
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/*
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* Copyright (c) 1994, 1995 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Chris G. Demetriou
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#ifndef _ALPHA_SIGNAL_H_
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#define _ALPHA_SIGNAL_H_
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typedef long sig_atomic_t;
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#ifndef _ANSI_SOURCE
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/*
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* Information pushed on stack when a signal is delivered.
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* This is used by the kernel to restore state following
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* execution of the signal handler. It is also made available
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* to the handler to allow it to restore state properly if
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* a non-standard exit is performed.
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*
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* Note that sc_regs[] and sc_fpregs[]+sc_fpcr are inline
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* representations of 'struct reg' and 'struct fpreg', respectively.
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*/
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typedef unsigned int osigset_t;
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struct osigcontext {
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long sc_onstack; /* sigstack state to restore */
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long sc_mask; /* signal mask to restore */
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long sc_pc; /* pc to restore */
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long sc_ps; /* ps to restore */
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unsigned long sc_regs[32]; /* integer register set (see above) */
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long sc_ownedfp; /* fp has been used */
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unsigned long sc_fpregs[32]; /* FP register set (see above) */
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unsigned long sc_fpcr; /* FP control register (see above) */
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unsigned long sc_fp_control; /* FP software control word */
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long sc_reserved[2]; /* XXX */
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long sc_xxx1[2]; /* sc_ssize, sc_sbase on DUX */
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unsigned long sc_traparg_a0; /* a0 argument to trap at exception */
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unsigned long sc_traparg_a1; /* a1 argument to trap at exception */
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unsigned long sc_traparg_a2; /* a2 argument to trap at exception */
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long sc_xxx2[3]; /* sc_fp_trap_pc, sc_fp_trigger_sum, sc_fp_trigger_inst */
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};
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/*
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* The sequence of the fields should match those in
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* mcontext_t. Keep them in sync!
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*/
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struct sigcontext {
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sigset_t sc_mask; /* signal mask to restore */
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long sc_onstack; /* sigstack state to restore */
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unsigned long sc_regs[32]; /* integer register set (see above) */
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long sc_ps; /* ps to restore */
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long sc_pc; /* pc to restore */
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unsigned long sc_traparg_a0; /* a0 argument to trap at exception */
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unsigned long sc_traparg_a1; /* a1 argument to trap at exception */
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unsigned long sc_traparg_a2; /* a2 argument to trap at exception */
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unsigned long sc_fpregs[32]; /* FP register set (see above) */
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unsigned long sc_fpcr; /* FP control register (see above) */
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unsigned long sc_fp_control; /* FP software control word */
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long sc_ownedfp; /* fp has been used */
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long sc_xxx1[2]; /* sc_ssize, sc_sbase on DUX */
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long sc_xxx2[3]; /* sc_fp_trap_pc, sc_fp_trigger_sum, sc_fp_trigger_inst */
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long sc_reserved[2]; /* XXX */
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};
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#define sc_sp sc_regs[R_SP]
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#endif /* !_ANSI_SOURCE */
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#endif /* !_ALPHA_SIGNAL_H_*/
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