cafd6dbd76
not save (restore) the global pointer (GP) in the jmpbuf in setjmp (longjmp) because it's not needed in general. GP is considered a scratch register at callsites and hence is always restored after a call (when it's possible that the call resolves to a symbol in a different loadmodule; otherwise GP does not have to be saved and restored at all), including calls to setjmp/longjmp. There's just one problem with this now that we use setjmp/longjmp for context switching: A new context must have GP defined properly for the thread's entry point. This means that we need to put GP in the jmpbuf and consequently that we have to restore is in longjmp. This automaticly requires us to save it as well. When setjmp/longjmp isn't used for context switching, this can be reverted again.
130 lines
3.9 KiB
C
130 lines
3.9 KiB
C
/*-
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* Copyright (c) 2000
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* Intel Corporation.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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*
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* This product includes software developed by Intel Corporation and
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* its contributors.
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*
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* 4. Neither the name of Intel Corporation or its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY INTEL CORPORATION AND CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL INTEL CORPORATION OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_SETJMP_H_
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#define _MACHINE_SETJMP_H_
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#include <sys/cdefs.h>
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#if __BSD_VISIBLE
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#define JMPBUF_ADDR_OF(buf, item) ((unsigned long)((char *)buf + item))
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#define J_UNAT 0
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#define J_NATS 0x8
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#define J_PFS 0x10
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#define J_BSP 0x18
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#define J_RNAT 0x20
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#define J_PREDS 0x28
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#define J_LC 0x30
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#define J_R4 0x38
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#define J_R5 0x40
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#define J_R6 0x48
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#define J_R7 0x50
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#define J_SP 0x58
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#define J_F2 0x60
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#define J_F3 0x70
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#define J_F4 0x80
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#define J_F5 0x90
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#define J_F16 0xa0
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#define J_F17 0xb0
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#define J_F18 0xc0
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#define J_F19 0xd0
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#define J_F20 0xe0
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#define J_F21 0xf0
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#define J_F22 0x100
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#define J_F23 0x110
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#define J_F24 0x120
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#define J_F25 0x130
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#define J_F26 0x140
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#define J_F27 0x150
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#define J_F28 0x160
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#define J_F29 0x170
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#define J_F30 0x180
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#define J_F31 0x190
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#define J_FPSR 0x1a0
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#define J_B0 0x1a8
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#define J_B1 0x1b0
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#define J_B2 0x1b8
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#define J_B3 0x1c0
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#define J_B4 0x1c8
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#define J_B5 0x1d0
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#define J_SIGMASK 0x1d8
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#define J_SIGSET 0x1e0
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#define J_GP 0x1f0
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#endif /* __BSD_VISIBLE */
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/*
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* We have 8 bytes left for future use, but it's a nice round,
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* but above all large number. Size is in bytes.
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*/
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#define _JMPBUFSZ 0x200
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/*
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* XXX this check is wrong, since LOCORE is in the application namespace and
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* applications shouldn't be able to affect the implementation. One workaround
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* would be to only check LOCORE if _KERNEL is defined, but unfortunately
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* LOCORE is used outside of the kernel. The best solution would be to rename
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* LOCORE to _LOCORE, so that it can be used in userland to safely affect the
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* implementation.
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*/
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#ifndef LOCORE
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/*
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* jmp_buf and sigjmp_buf are encapsulated in different structs to force
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* compile-time diagnostics for mismatches. The structs are the same
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* internally to avoid some run-time errors for mismatches.
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*/
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#if __BSD_VISIBLE || __POSIX_VISIBLE || __XSI_VISIBLE
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struct _sigjmp_buf {
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char _Buffer[_JMPBUFSZ];
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} __aligned(16);
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typedef struct _sigjmp_buf sigjmp_buf[1];
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#endif
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struct _jmp_buf {
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char _Buffer[_JMPBUFSZ];
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} __aligned(16);
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typedef struct _jmp_buf jmp_buf[1];
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#endif /* !LOCORE */
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#endif /* !_MACHINE_SETJMP_H_ */
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