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freebsd-dev/sys/alpha/include/ucontext.h

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sigset_t change (part 3 of 5) ----------------------------- By introducing a new sigframe so that the signal handler operates on the new siginfo_t and on ucontext_t instead of sigcontext, we now need two version of sendsig and sigreturn. A flag in struct proc determines whether the process expects an old sigframe or a new sigframe. The signal trampoline handles which sigreturn to call. It does this by testing for a magic cookie in the frame. The alpha uses osigreturn to implement longjmp. This means that osigreturn is not only used for compatibility with existing binaries. To handle the new sigset_t, setjmp saves it in sc_reserved (see NOTE). the struct sigframe has been moved from frame.h to sigframe.h to handle the complex header dependencies that was caused by the new sigframe. NOTE: For the i386, the size of jmp_buf has been increased to hold the new sigset_t. On the alpha this has been prevented by using sc_reserved in sigcontext.
1999-09-29 15:06:27 +00:00
/*-
* Copyright (c) 1999 Marcel Moolenaar
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
#ifndef _MACHINE_UCONTEXT_H_
Re-introduction of sigcontext. 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
1999-10-04 19:33:58 +00:00
#define _MACHINE_UCONTEXT_H_
sigset_t change (part 3 of 5) ----------------------------- By introducing a new sigframe so that the signal handler operates on the new siginfo_t and on ucontext_t instead of sigcontext, we now need two version of sendsig and sigreturn. A flag in struct proc determines whether the process expects an old sigframe or a new sigframe. The signal trampoline handles which sigreturn to call. It does this by testing for a magic cookie in the frame. The alpha uses osigreturn to implement longjmp. This means that osigreturn is not only used for compatibility with existing binaries. To handle the new sigset_t, setjmp saves it in sc_reserved (see NOTE). the struct sigframe has been moved from frame.h to sigframe.h to handle the complex header dependencies that was caused by the new sigframe. NOTE: For the i386, the size of jmp_buf has been increased to hold the new sigset_t. On the alpha this has been prevented by using sc_reserved in sigcontext.
1999-09-29 15:06:27 +00:00
Re-introduction of sigcontext. 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
1999-10-04 19:33:58 +00:00
typedef struct __mcontext {
/*
* These fields must match the definition
* of struct sigcontext. That way we can support
* struct sigcontext and ucontext_t at the same
* time.
*/
long mc_onstack; /* XXX - sigcontext compat. */
unsigned long mc_regs[37];
unsigned long mc_fpregs[32];
unsigned long mc_fpcr;
unsigned long mc_fp_control;
long mc_ownedfp;
Use a spare slot in the machine context to identify the context format and to inherently verify its validity. Alpha signal frames and trap frames are different; this field identifies which format the context is Set the machine context format (signal frame) before copying it out when sending a signal. Approved by: -arch
2002-01-10 02:36:30 +00:00
#define __UC_REV0_SIGFRAME 1 /* context is a signal frame */
#define __UC_REV0_TRAPFRAME 2 /* context is a trap frame */
long mc_format;
long __spare__[6];
sigset_t change (part 3 of 5) ----------------------------- By introducing a new sigframe so that the signal handler operates on the new siginfo_t and on ucontext_t instead of sigcontext, we now need two version of sendsig and sigreturn. A flag in struct proc determines whether the process expects an old sigframe or a new sigframe. The signal trampoline handles which sigreturn to call. It does this by testing for a magic cookie in the frame. The alpha uses osigreturn to implement longjmp. This means that osigreturn is not only used for compatibility with existing binaries. To handle the new sigset_t, setjmp saves it in sc_reserved (see NOTE). the struct sigframe has been moved from frame.h to sigframe.h to handle the complex header dependencies that was caused by the new sigframe. NOTE: For the i386, the size of jmp_buf has been increased to hold the new sigset_t. On the alpha this has been prevented by using sc_reserved in sigcontext.
1999-09-29 15:06:27 +00:00
} mcontext_t;
Re-introduction of sigcontext. 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
1999-10-04 19:33:58 +00:00
#endif /* !_MACHINE_UCONTEXT_H_ */
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