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/*-
* Copyright (c) 2014 Andrew Turner
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 THE AUTHOR 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_ASM_H_
#define _MACHINE_ASM_H_
#undef __FBSDID
#if !defined(lint) && !defined(STRIP_FBSDID)
#define __FBSDID(s) .ident s
#else
#define __FBSDID(s) /* nothing */
#endif
#define _C_LABEL(x) x
#define ENTRY(sym) \
.text; .globl sym; .align 2; .type sym,#function; sym:
#define EENTRY(sym) \
.globl sym; sym:
#define END(sym) .size sym, . - sym
#define EEND(sym)
#define WEAK_REFERENCE(sym, alias) \
.weak alias; \
.set alias,sym
#define UINT64_C(x) (x)
#if defined(PIC)
#define PIC_SYM(x,y) x ## @ ## y
#else
#define PIC_SYM(x,y) x
#endif
/*
* Sets the trap fault handler. The exception handler will return to the
* address in the handler register on a data abort or the xzr register to
* clear the handler. The tmp parameter should be a register able to hold
* the temporary data.
*/
#define SET_FAULT_HANDLER(handler, tmp) \
ldr tmp, [x18, #PC_CURTHREAD]; /* Load curthread */ \
ldr tmp, [tmp, #TD_PCB]; /* Load the pcb */ \
str handler, [tmp, #PCB_ONFAULT] /* Set the handler */
#define ENTER_USER_ACCESS(reg, tmp) \
ldr tmp, =has_pan; /* Get the addr of has_pan */ \
ldr reg, [tmp]; /* Read it */ \
cbz reg, 997f; /* If no PAN skip */ \
.inst 0xd500409f | (0 << 8); /* Clear PAN */ \
997:
#define EXIT_USER_ACCESS(reg) \
cbz reg, 998f; /* If no PAN skip */ \
.inst 0xd500409f | (1 << 8); /* Set PAN */ \
998:
#define EXIT_USER_ACCESS_CHECK(reg, tmp) \
ldr tmp, =has_pan; /* Get the addr of has_pan */ \
ldr reg, [tmp]; /* Read it */ \
cbz reg, 999f; /* If no PAN skip */ \
.inst 0xd500409f | (1 << 8); /* Set PAN */ \
999:
#endif /* _MACHINE_ASM_H_ */
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