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mcontext.h revision 1.14 
      1 /*	$NetBSD: mcontext.h,v 1.14 2012/12/08 02:41:54 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2001, 2002 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Klaus Klein and by Jason R. Thorpe of Wasabi Systems, Inc.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _ARM_MCONTEXT_H_
     33 #define _ARM_MCONTEXT_H_
     34 
     35 #include <sys/stdint.h>
     36 /*
     37  * General register state
     38  */
     39 #define _NGREG		17
     40 typedef unsigned int	__greg_t;
     41 typedef __greg_t	__gregset_t[_NGREG];
     42 
     43 #define _REG_R0		0
     44 #define _REG_R1		1
     45 #define _REG_R2		2
     46 #define _REG_R3		3
     47 #define _REG_R4		4
     48 #define _REG_R5		5
     49 #define _REG_R6		6
     50 #define _REG_R7		7
     51 #define _REG_R8		8
     52 #define _REG_R9		9
     53 #define _REG_R10	10
     54 #define _REG_R11	11
     55 #define _REG_R12	12
     56 #define _REG_R13	13
     57 #define _REG_R14	14
     58 #define _REG_R15	15
     59 #define _REG_CPSR	16
     60 /* Convenience synonyms */
     61 #define _REG_FP		_REG_R11
     62 #define _REG_SP		_REG_R13
     63 #define _REG_LR		_REG_R14
     64 #define _REG_PC		_REG_R15
     65 
     66 /*
     67  * Floating point register state
     68  */
     69 /* Note: the storage layout of this structure must be identical to ARMFPE! */
     70 typedef struct {
     71 	unsigned int	__fp_fpsr;
     72 	struct {
     73 		unsigned int	__fp_exponent;
     74 		unsigned int	__fp_mantissa_hi;
     75 		unsigned int	__fp_mantissa_lo;
     76 	}		__fp_fr[8];
     77 } __fpregset_t;
     78 
     79 typedef struct {
     80 #ifdef __ARM_EABI__
     81 	unsigned int	__vfp_fpscr;
     82 	uint64_t	__vfp_fstmx[32];
     83 	unsigned int	__vfp_fpsid;
     84 #else
     85 	unsigned int	__vfp_fpscr;
     86 	unsigned int	__vfp_fstmx[33];
     87 	unsigned int	__vfp_fpsid;
     88 #endif
     89 } __vfpregset_t;
     90 
     91 typedef struct {
     92 	__gregset_t	__gregs;
     93 	union {
     94 		__fpregset_t __fpregs;
     95 		__vfpregset_t __vfpregs;
     96 	} __fpu;
     97 	__greg_t	_mc_tlsbase;
     98 } mcontext_t, mcontext32_t;
     99 
    100 /* Machine-dependent uc_flags */
    101 #define	_UC_ARM_VFP	0x00010000	/* FPU field is VFP */
    102 
    103 /* used by signal delivery to indicate status of signal stack */
    104 #define _UC_SETSTACK	0x00020000
    105 #define _UC_CLRSTACK	0x00040000
    106 
    107 #define	_UC_TLSBASE	0x00080000
    108 
    109 #define _UC_MACHINE_PAD	2		/* Padding appended to ucontext_t */
    110 
    111 #define _UC_MACHINE_SP(uc)	((uc)->uc_mcontext.__gregs[_REG_SP])
    112 #define _UC_MACHINE_PC(uc)	((uc)->uc_mcontext.__gregs[_REG_PC])
    113 #define _UC_MACHINE_INTRV(uc)	((uc)->uc_mcontext.__gregs[_REG_R0])
    114 
    115 #define	_UC_MACHINE_SET_PC(uc, pc)	_UC_MACHINE_PC(uc) = (pc)
    116 
    117 #define	__UCONTEXT_SIZE	256
    118 
    119 static __inline void *
    120 __lwp_getprivate_fast(void)
    121 {
    122 	extern void *_lwp_getprivate(void);
    123 	void *rv;
    124 	__asm("mrc p15, 0, %0, c13, c0, 3" : "=r"(rv));
    125 	if (__predict_true(rv))
    126 		return rv;
    127 	/*
    128 	 * Some ARM cores are broken and don't raise an undefined fault when an
    129 	 * unrecogized mrc instruction is encountered, but just return zero.
    130 	 * To do deal with that, if we get a zero we (re-)fetch the value using
    131 	 * syscall.
    132 	 */
    133 	return _lwp_getprivate();
    134 }
    135 
    136 #if defined(_KERNEL)
    137 void vfp_getcontext(struct lwp *, mcontext_t *, int *);
    138 void vfp_setcontext(struct lwp *, const mcontext_t *);
    139 #endif
    140 
    141 #endif	/* !_ARM_MCONTEXT_H_ */
    142