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  * $FreeBSD$
   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 #ifdef KDTRACE_HOOKS
   42 #define DTRACE_NOP      nop
   43 #else
   44 #define DTRACE_NOP
   45 #endif
   46 
   47 #define LENTRY(sym)                                             \
   48         .text; .align 2; .type sym,#function; sym:              \
   49         .cfi_startproc; DTRACE_NOP
   50 #define ENTRY(sym)                                              \
   51         .globl sym; LENTRY(sym)
   52 #define EENTRY(sym)                                             \
   53         .globl  sym; sym:
   54 #define LEND(sym) .ltorg; .cfi_endproc; .size sym, . - sym
   55 #define END(sym) LEND(sym)
   56 #define EEND(sym)
   57 
   58 #define WEAK_REFERENCE(sym, alias)                              \
   59         .weak alias;                                            \
   60         .set alias,sym
   61 
   62 #define UINT64_C(x)     (x)
   63 
   64 #if defined(PIC)
   65 #define PIC_SYM(x,y)    x ## @ ## y
   66 #else
   67 #define PIC_SYM(x,y)    x
   68 #endif
   69 
   70 /* Alias for link register x30 */
   71 #define lr              x30
   72 
   73 /*
   74  * Sets the trap fault handler. The exception handler will return to the
   75  * address in the handler register on a data abort or the xzr register to
   76  * clear the handler. The tmp parameter should be a register able to hold
   77  * the temporary data.
   78  */
   79 #define SET_FAULT_HANDLER(handler, tmp)                                 \
   80         ldr     tmp, [x18, #PC_CURTHREAD];      /* Load curthread */    \
   81         ldr     tmp, [tmp, #TD_PCB];            /* Load the pcb */      \
   82         str     handler, [tmp, #PCB_ONFAULT]    /* Set the handler */
   83 
   84 #define ENTER_USER_ACCESS(reg, tmp)                                     \
   85         ldr     tmp, =has_pan;                  /* Get the addr of has_pan */ \
   86         ldr     reg, [tmp];                     /* Read it */           \
   87         cbz     reg, 997f;                      /* If no PAN skip */    \
   88         .inst   0xd500409f | (0 << 8);          /* Clear PAN */         \
   89         997:
   90 
   91 #define EXIT_USER_ACCESS(reg)                                           \
   92         cbz     reg, 998f;                      /* If no PAN skip */    \
   93         .inst   0xd500409f | (1 << 8);          /* Set PAN */           \
   94         998:
   95 
   96 #define EXIT_USER_ACCESS_CHECK(reg, tmp)                                \
   97         ldr     tmp, =has_pan;                  /* Get the addr of has_pan */ \
   98         ldr     reg, [tmp];                     /* Read it */           \
   99         cbz     reg, 999f;                      /* If no PAN skip */    \
  100         .inst   0xd500409f | (1 << 8);          /* Set PAN */           \
  101         999:
  102 
  103 /*
  104  * Some AArch64 CPUs speculate past an eret instruction. As the user may
  105  * control the registers at this point add a speculation barrier usable on
  106  * all AArch64 CPUs after the eret instruction.
  107  * TODO: ARMv8.5 adds a specific instruction for this, we could use that
  108  * if we know we are running on something that supports it.
  109  */
  110 #define ERET                                                            \
  111         eret;                                                           \
  112         dsb     sy;                                                     \
  113         isb
  114 
  115 #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