asm.h

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    1 /*-
    2  * Copyright (c) 2014 Andrew Turner
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/11.2/sys/arm64/include/asm.h 319202 2017-05-30 12:26:36Z andrew $
   27  */
   28 
   29 #ifndef _MACHINE_ASM_H_
   30 #define _MACHINE_ASM_H_
   31 
   32 #undef __FBSDID
   33 #if !defined(lint) && !defined(STRIP_FBSDID)
   34 #define __FBSDID(s)     .ident s
   35 #else
   36 #define __FBSDID(s)     /* nothing */
   37 #endif
   38 
   39 #define _C_LABEL(x)     x
   40 
   41 #define ENTRY(sym)                                              \
   42         .text; .globl sym; .align 2; .type sym,#function; sym:
   43 #define EENTRY(sym)                                             \
   44         .globl  sym; sym:
   45 #define END(sym) .size sym, . - sym
   46 #define EEND(sym)
   47 
   48 #define WEAK_REFERENCE(sym, alias)                              \
   49         .weak alias;                                            \
   50         .set alias,sym
   51 
   52 #define UINT64_C(x)     (x)
   53 
   54 #if defined(PIC)
   55 #define PIC_SYM(x,y)    x ## @ ## y
   56 #else
   57 #define PIC_SYM(x,y)    x
   58 #endif
   59 
   60 /*
   61  * Sets the trap fault handler. The exception handler will return to the
   62  * address in the handler register on a data abort or the xzr register to
   63  * clear the handler. The tmp parameter should be a register able to hold
   64  * the temporary data.
   65  */
   66 #define SET_FAULT_HANDLER(handler, tmp)                                 \
   67         ldr     tmp, [x18, #PC_CURTHREAD];      /* Load curthread */    \
   68         ldr     tmp, [tmp, #TD_PCB];            /* Load the pcb */      \
   69         str     handler, [tmp, #PCB_ONFAULT]    /* Set the handler */
   70 
   71 #define ENTER_USER_ACCESS(reg, tmp)                                     \
   72         ldr     tmp, =has_pan;                  /* Get the addr of has_pan */ \
   73         ldr     reg, [tmp];                     /* Read it */           \
   74         cbz     reg, 997f;                      /* If no PAN skip */    \
   75         .inst   0xd500409f | (0 << 8);          /* Clear PAN */         \
   76         997:
   77 
   78 #define EXIT_USER_ACCESS(reg)                                           \
   79         cbz     reg, 998f;                      /* If no PAN skip */    \
   80         .inst   0xd500409f | (1 << 8);          /* Set PAN */           \
   81         998:
   82 
   83 #define EXIT_USER_ACCESS_CHECK(reg, tmp)                                \
   84         ldr     tmp, =has_pan;                  /* Get the addr of has_pan */ \
   85         ldr     reg, [tmp];                     /* Read it */           \
   86         cbz     reg, 999f;                      /* If no PAN skip */    \
   87         .inst   0xd500409f | (1 << 8);          /* Set PAN */           \
   88         999:
   89 
   90 #endif /* _MACHINE_ASM_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/arm64/include/asm.h

FreeBSD/Linux Kernel Cross Reference
sys/arm64/include/asm.h