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

     /*      $NetBSD: asm.h,v 1.5 2003/08/07 16:26:53 agc Exp $      */
     
     /*-
      * Copyright (c) 1990 The Regents of the University of California.
      * All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * William Jolitz.
      *
     * 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.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
     *
     *      from: @(#)asm.h 5.5 (Berkeley) 5/7/91
     *
     * $FreeBSD: releng/10.1/sys/arm/include/asm.h 271337 2014-09-09 22:24:01Z ian $
     */
    
    #ifndef _MACHINE_ASM_H_
    #define _MACHINE_ASM_H_
    #include <sys/cdefs.h>
    
    #define _C_LABEL(x)     x
    #define _ASM_LABEL(x)   x
    
    #define I32_bit (1 << 7)        /* IRQ disable */
    #define F32_bit (1 << 6)        /* FIQ disable */
    
    #define CPU_CONTROL_32BP_ENABLE 0x00000010 /* P: 32-bit exception handlers */
    #define CPU_CONTROL_32BD_ENABLE 0x00000020 /* D: 32-bit addressing */
    
    #ifndef _ALIGN_TEXT
    # define _ALIGN_TEXT .align 0
    #endif
    
    #if defined(__ARM_EABI__) && !defined(_STANDALONE)
    #define STOP_UNWINDING  .cantunwind
    #define _FNSTART        .fnstart
    #define _FNEND          .fnend
    #else
    #define STOP_UNWINDING
    #define _FNSTART
    #define _FNEND
    #endif
    
    /*
     * gas/arm uses @ as a single comment character and thus cannot be used here
     * Instead it recognised the # instead of an @ symbols in .type directives
     * We define a couple of macros so that assembly code will not be dependent
     * on one or the other.
     */
    #define _ASM_TYPE_FUNCTION      #function
    #define _ASM_TYPE_OBJECT        #object
    #define GLOBAL(X) .globl x
    #define _ENTRY(x) \
            .text; _ALIGN_TEXT; .globl x; .type x,_ASM_TYPE_FUNCTION; x: _FNSTART
    #define _END(x) .size x, . - x; _FNEND
    
    /*
     * EENTRY()/EEND() mark "extra" entry/exit points from a function.
     * The unwind info cannot handle the concept of a nested function, or a function
     * with multiple .fnstart directives, but some of our assembler code is written
     * with multiple labels to allow entry at several points.  The EENTRY() macro
     * defines such an extra entry point without a new .fnstart, so that it's
     * basically just a label that you can jump to.  The EEND() macro does nothing
     * at all, except document the exit point associated with the same-named entry.
     */
    #define _EENTRY(x)      .globl x; .type x,_ASM_TYPE_FUNCTION; x:
    #define _EEND(x)        /* nothing */
    
    #ifdef GPROF
    #  define _PROF_PROLOGUE        \
            mov ip, lr; bl __mcount
    #else
    # define _PROF_PROLOGUE
    #endif
    
    #define ENTRY(y)        _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE
    #define EENTRY(y)       _EENTRY(_C_LABEL(y)); _PROF_PROLOGUE
   #define ENTRY_NP(y)     _ENTRY(_C_LABEL(y))
   #define EENTRY_NP(y)    _EENTRY(_C_LABEL(y))
   #define END(y)          _END(_C_LABEL(y))
   #define EEND(y)
   #define ASENTRY(y)      _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
   #define ASEENTRY(y)     _EENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
   #define ASENTRY_NP(y)   _ENTRY(_ASM_LABEL(y))
   #define ASEENTRY_NP(y)  _EENTRY(_ASM_LABEL(y))
   #define ASEND(y)        _END(_ASM_LABEL(y))
   #define ASEEND(y)
   
   #define ASMSTR          .asciz
   
   #if defined(PIC)
   #define PLT_SYM(x)      PIC_SYM(x, PLT)
   #define GOT_SYM(x)      PIC_SYM(x, GOT)
   #define GOT_GET(x,got,sym)      \
           ldr     x, sym;         \
           ldr     x, [x, got]
   #define GOT_INIT(got,gotsym,pclabel) \
           ldr     got, gotsym;    \
           add     got, got, pc;   \
           pclabel:
   #define GOT_INITSYM(gotsym,pclabel) \
           gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) + (. - (pclabel+4))
   
   #ifdef __STDC__
   #define PIC_SYM(x,y)    x ## ( ## y ## )
   #else
   #define PIC_SYM(x,y)    x/**/(/**/y/**/)
   #endif
   
   #else
   #define PLT_SYM(x)      x
   #define GOT_SYM(x)      x
   #define GOT_GET(x,got,sym)      \
           ldr     x, sym;
   #define GOT_INIT(got,gotsym,pclabel)
   #define GOT_INITSYM(gotsym,pclabel)
   #define PIC_SYM(x,y)    x
   #endif  /* PIC */
   
   #undef __FBSDID
   #if !defined(lint) && !defined(STRIP_FBSDID)
   #define __FBSDID(s)     .ident s
   #else
   #define __FBSDID(s)     /* nothing */
   #endif
           
   
   #define WEAK_ALIAS(alias,sym)                                           \
           .weak alias;                                                    \
           alias = sym
   
   #ifdef __STDC__
   #define WARN_REFERENCES(sym,msg)                                        \
           .stabs msg ## ,30,0,0,0 ;                                       \
           .stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0
   #else
   #define WARN_REFERENCES(sym,msg)                                        \
           .stabs msg,30,0,0,0 ;                                           \
           .stabs __STRING(sym),1,0,0,0
   #endif /* __STDC__ */
   
   /* Exactly one of the __ARM_ARCH_*__ macros will be defined by the compiler. */
   /* The _ARM_ARCH_* macros are deprecated and will be removed soon. */
   /* This should be moved into another header so it can be used in
    * both asm and C code. machine/asm.h cannot be included in C code. */
   #if defined (__ARM_ARCH_7__) || defined (__ARM_ARCH_7A__)
   #define _ARM_ARCH_7
   #define _HAVE_ARMv7_INSTRUCTIONS 1
   #endif
   
   #if defined (_HAVE_ARMv7_INSTRUCTIONS) || defined (__ARM_ARCH_6__) || \
           defined (__ARM_ARCH_6J__) || defined (__ARM_ARCH_6K__) || \
           defined (__ARM_ARCH_6Z__) || defined (__ARM_ARCH_6ZK__)
   #define _ARM_ARCH_6
   #define _HAVE_ARMv6_INSTRUCTIONS 1
   #endif
   
   #if defined (_HAVE_ARMv6_INSTRUCTIONS) || defined (__ARM_ARCH_5TE__) || \
       defined (__ARM_ARCH_5TEJ__) || defined (__ARM_ARCH_5E__)
   #define _ARM_ARCH_5E
   #define _HAVE_ARMv5E_INSTRUCTIONS 1
   #endif
   
   #if defined (_HAVE_ARMv5E_INSTRUCTIONS) || defined (__ARM_ARCH_5__) || \
       defined (__ARM_ARCH_5T__)
   #define _ARM_ARCH_5
   #define _HAVE_ARMv5_INSTRUCTIONS 1
   #endif
   
   #if defined (_HAVE_ARMv5_INSTRUCTIONS) || defined (__ARM_ARCH_4T__)
   #define _ARM_ARCH_4T
   #define _HAVE_ARMv4T_INSTRUCTIONS 1
   #endif
   
   /* FreeBSD requires ARMv4, so this is always set. */
   #define _HAVE_ARMv4_INSTRUCTIONS 1
   
   #if defined (_HAVE_ARMv4T_INSTRUCTIONS)
   # define RET    bx      lr
   # define RETeq  bxeq    lr
   # define RETne  bxne    lr
   # define RETc(c) bx##c  lr
   #else
   # define RET    mov     pc, lr
   # define RETeq  moveq   pc, lr
   # define RETne  movne   pc, lr
   # define RETc(c) mov##c pc, lr
   #endif
   
   #endif /* !_MACHINE_ASM_H_ */

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