7aa65edc75
Don't force 16-byte alignment at run-time. Do it at compile-time. This saves us the pointer fiddling by the setjmp functions and reduces complexity. While here, increase the jmp_buf by 16 bytes to an even 512 bytes. Coincidentally, due to the way alignment was handled prior to this change, the jmp_buf has not changed in size, but only in how the space is used. Prior to this change the 16 bytes were reserved for enforcing alignment; now they are reserved by us for future extensions. Therefore, this ABI breaker is relatively save: the failure is always an alignment trap.
130 lines
3.9 KiB
C
130 lines
3.9 KiB
C
/*-
|
|
* Copyright (c) 2000
|
|
* Intel Corporation.
|
|
* 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.
|
|
*
|
|
* 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. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
*
|
|
* This product includes software developed by Intel Corporation and
|
|
* its contributors.
|
|
*
|
|
* 4. Neither the name of Intel Corporation or its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY INTEL CORPORATION AND CONTRIBUTORS ``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 INTEL CORPORATION OR CONTRIBUTORS 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_SETJMP_H_
|
|
#define _MACHINE_SETJMP_H_
|
|
|
|
#include <sys/cdefs.h>
|
|
|
|
#if __BSD_VISIBLE
|
|
#define JMPBUF_ADDR_OF(buf, item) ((unsigned long)((char *)buf + item))
|
|
|
|
#define J_UNAT 0
|
|
#define J_NATS 0x8
|
|
#define J_PFS 0x10
|
|
#define J_BSP 0x18
|
|
#define J_RNAT 0x20
|
|
#define J_PREDS 0x28
|
|
#define J_LC 0x30
|
|
#define J_R4 0x38
|
|
#define J_R5 0x40
|
|
#define J_R6 0x48
|
|
#define J_R7 0x50
|
|
#define J_SP 0x58
|
|
#define J_F2 0x60
|
|
#define J_F3 0x70
|
|
#define J_F4 0x80
|
|
#define J_F5 0x90
|
|
#define J_F16 0xa0
|
|
#define J_F17 0xb0
|
|
#define J_F18 0xc0
|
|
#define J_F19 0xd0
|
|
#define J_F20 0xe0
|
|
#define J_F21 0xf0
|
|
#define J_F22 0x100
|
|
#define J_F23 0x110
|
|
#define J_F24 0x120
|
|
#define J_F25 0x130
|
|
#define J_F26 0x140
|
|
#define J_F27 0x150
|
|
#define J_F28 0x160
|
|
#define J_F29 0x170
|
|
#define J_F30 0x180
|
|
#define J_F31 0x190
|
|
#define J_FPSR 0x1a0
|
|
#define J_B0 0x1a8
|
|
#define J_B1 0x1b0
|
|
#define J_B2 0x1b8
|
|
#define J_B3 0x1c0
|
|
#define J_B4 0x1c8
|
|
#define J_B5 0x1d0
|
|
#define J_SIG0 0x1d8
|
|
#define J_SIG1 0x1e0
|
|
#define J_SIGMASK 0x1e8
|
|
#endif /* __BSD_VISIBLE */
|
|
|
|
/*
|
|
* We have 16 bytes left for future use, but it's a nice round,
|
|
* but above all large number. Size is in bytes.
|
|
*/
|
|
#define _JMPBUFSZ 0x200
|
|
|
|
/*
|
|
* XXX this check is wrong, since LOCORE is in the application namespace and
|
|
* applications shouldn't be able to affect the implementation. One workaround
|
|
* would be to only check LOCORE if _KERNEL is defined, but unfortunately
|
|
* LOCORE is used outside of the kernel. The best solution would be to rename
|
|
* LOCORE to _LOCORE, so that it can be used in userland to safely affect the
|
|
* implementation.
|
|
*/
|
|
#ifndef LOCORE
|
|
|
|
/*
|
|
* jmp_buf and sigjmp_buf are encapsulated in different structs to force
|
|
* compile-time diagnostics for mismatches. The structs are the same
|
|
* internally to avoid some run-time errors for mismatches.
|
|
*/
|
|
#if __BSD_VISIBLE || __POSIX_VISIBLE || __XSI_VISIBLE
|
|
struct _sigjmp_buf {
|
|
char _Buffer[_JMPBUFSZ];
|
|
} __aligned(16);
|
|
typedef struct _sigjmp_buf sigjmp_buf[1];
|
|
#endif
|
|
|
|
struct _jmp_buf {
|
|
char _Buffer[_JMPBUFSZ];
|
|
} __aligned(16);
|
|
typedef struct _jmp_buf jmp_buf[1];
|
|
|
|
#endif /* !LOCORE */
|
|
|
|
#endif /* !_MACHINE_SETJMP_H_ */
|