e68508e172
To allow consistent values to be used in both the kernel and userspace create a function for these to be read from the kernel. They use a newly created macro with the name of the ID register to read. For now there is redundant information in the user_regs array as it still holds the CRm and Op2 values, however this will be fixed in a later change. This will be used by ptrace to allow hardware breakpoints in userspace. Sponsored by: DARPA, AFRL
70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
/*-
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* Copyright (c) 2017 Andrew Turner
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* All rights reserved.
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*
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* This software was developed by SRI International and the University of
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* Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
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* ("CTSRD"), as part of the DARPA CRASH research programme.
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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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* 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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* 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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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* 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 THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE__UNDEFINED_H_
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#define _MACHINE__UNDEFINED_H_
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#ifdef _KERNEL
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typedef int (*undef_handler_t)(vm_offset_t, uint32_t, struct trapframe *,
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uint32_t);
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static inline int
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mrs_Op0(uint32_t insn)
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{
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/* op0 is encoded without the top bit in a mrs instruction */
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return (2 | ((insn & MRS_Op0_MASK) >> MRS_Op0_SHIFT));
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}
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#define MRS_GET(op) \
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static inline int \
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mrs_##op(uint32_t insn) \
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{ \
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\
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return ((insn & MRS_##op##_MASK) >> MRS_##op##_SHIFT); \
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}
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MRS_GET(Op1)
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MRS_GET(CRn)
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MRS_GET(CRm)
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MRS_GET(Op2)
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void undef_init(void);
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void *install_undef_handler(bool, undef_handler_t);
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void remove_undef_handler(void *);
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int undef_insn(u_int, struct trapframe *);
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bool extract_user_id_field(u_int, u_int, uint8_t *);
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#endif /* _KERNEL */
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#endif
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