sys/arch/sparc/include/asm.h

   1 /*      $NetBSD: asm.h,v 1.15 2002/09/17 15:28:28 uwe Exp $ */
   2
   3 /*
   4  * Copyright (c) 1994 Allen Briggs
   5  * All rights reserved.
   6  *
   7  * Gleaned from locore.s and sun3 asm.h which had the following copyrights:
   8  * locore.s:
   9  * Copyright (c) 1988 University of Utah.
  10  * Copyright (c) 1982, 1990 The Regents of the University of California.
  11  * sun3/include/asm.h:
  12  * Copyright (c) 1993 Adam Glass
  13  * Copyright (c) 1990 The Regents of the University of California.
  14  *
  15  * Redistribution and use in source and binary forms, with or without
  16  * modification, are permitted provided that the following conditions
  17  * are met:
  18  * 1. Redistributions of source code must retain the above copyright
  19  *    notice, this list of conditions and the following disclaimer.
  20  * 2. Redistributions in binary form must reproduce the above copyright
  21  *    notice, this list of conditions and the following disclaimer in the
  22  *    documentation and/or other materials provided with the distribution.
  23  * 3. All advertising materials mentioning features or use of this software
  24  *    must display the following acknowledgement:
  25  *      This product includes software developed by the University of
  26  *      California, Berkeley and its contributors.
  27  * 4. Neither the name of the University nor the names of its contributors
  28  *    may be used to endorse or promote products derived from this software
  29  *    without specific prior written permission.
  30  *
  31  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  32  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  33  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  34  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  35  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  39  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  40  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  41  * SUCH DAMAGE.
  42  */
  43
  44 #ifndef _ASM_H_
  45 #define _ASM_H_
  46
  47 /* Pull in CCFSZ, CC64FSZ, and BIAS from frame.h */
  48 #ifndef _LOCORE
  49 #define _LOCORE
  50 #endif
  51 #include <machine/frame.h>
  52
  53 #ifdef __ELF__
  54 #define _C_LABEL(name)          name
  55 #else
  56 #ifdef __STDC__
  57 #define _C_LABEL(name)          _ ## name
  58 #else
  59 #define _C_LABEL(name)          _/**/name
  60 #endif
  61 #endif
  62 #define _ASM_LABEL(name)        name
  63
  64 #ifdef PIC
  65 /*
  66  * PIC_PROLOGUE() is akin to the compiler generated function prologue for
  67  * PIC code. It leaves the address of the Global Offset Table in DEST,
  68  * clobbering register TMP in the process.
  69  *
  70  * We can use two code sequences.  We can read the %pc or use the call
  71  * instruction that saves the pc in %o7.  Call requires the branch unit and
  72  * IEU1, and clobbers %o7 which needs to be restored.  This instruction
  73  * sequence takes about 4 cycles due to instruction interdependence.  Reading
  74  * the pc takes 4 cycles to dispatch and is always dispatched alone.  That
  75  * sequence takes 7 cycles.
  76  */
  77 #ifdef __arch64__
  78 #define PIC_PROLOGUE(dest,tmp) \
  79         mov %o7, tmp; \
  80         sethi %hi(_GLOBAL_OFFSET_TABLE_-4),dest; \
  81         call 0f; \
  82          or dest,%lo(_GLOBAL_OFFSET_TABLE_+4),dest; \
  83 0: \
  84         add dest,%o7,dest; \
  85         mov tmp, %o7
  86 #else
  87 #define PIC_PROLOGUE(dest,tmp) \
  88         mov %o7,tmp; 3: call 4f; nop; 4: \
  89         sethi %hi(_C_LABEL(_GLOBAL_OFFSET_TABLE_)-(3b-.)),dest; \
  90         or dest,%lo(_C_LABEL(_GLOBAL_OFFSET_TABLE_)-(3b-.)),dest; \
  91         add dest,%o7,dest; mov tmp,%o7
  92 #endif
  93
  94 /*
  95  * PICCY_SET() does the equivalent of a `set var, %dest' instruction in
  96  * a PIC-like way, but without involving the Global Offset Table. This
  97  * only works for VARs defined in the same file *and* in the text segment.
  98  */
  99 #ifdef __arch64__
 100 #define PICCY_SET(var,dest,tmp) \
 101         3: rd %pc, tmp; add tmp,(var-3b),dest
 102 #else
 103 #define PICCY_SET(var,dest,tmp) \
 104         mov %o7,tmp; 3: call 4f; nop; 4: \
 105         add %o7,(var-3b),dest; mov tmp,%o7
 106 #endif
 107 #else
 108 #define PIC_PROLOGUE(dest,tmp)
 109 #define PICCY_OFFSET(var,dest,tmp)
 110 #endif
 111
 112 #define FTYPE(x)                .type x,@function
 113 #define OTYPE(x)                .type x,@object
 114
 115 #define _ENTRY(name) \
 116         .align 4; .globl name; .proc 1; FTYPE(name); name:
 117
 118 #ifdef GPROF
 119 /* see _MCOUNT_ENTRY in profile.h */
 120 #ifdef __ELF__
 121 #ifdef __arch64__
 122 #define _PROF_PROLOGUE \
 123         .data; .align 8; 1: .uaword 0; .uaword 0; \
 124         .text; save %sp,-CC64FSZ,%sp; sethi %hi(1b),%o0; call _mcount; \
 125         or %o0,%lo(1b),%o0; restore
 126 #else
 127 #define _PROF_PROLOGUE \
 128         .data; .align 4; 1: .long 0; \
 129         .text; save %sp,-96,%sp; sethi %hi(1b),%o0; call _mcount; \
 130         or %o0,%lo(1b),%o0; restore
 131 #endif
 132 #else
 133 #ifdef __arch64__
 134 #define _PROF_PROLOGUE \
 135         .data; .align 8; 1: .uaword 0; .uaword 0; \
 136         .text; save %sp,-CC64FSZ,%sp; sethi %hi(1b),%o0; call mcount; \
 137         or %o0,%lo(1b),%o0; restore
 138 #else
 139 #define _PROF_PROLOGUE \
 140         .data; .align 4; 1: .long 0; \
 141         .text; save %sp,-96,%sp; sethi %hi(1b),%o0; call mcount; \
 142         or %o0,%lo(1b),%o0; restore
 143 #endif
 144 #endif
 145 #else
 146 #define _PROF_PROLOGUE
 147 #endif
 148
 149 #define ENTRY(name)             _ENTRY(_C_LABEL(name)); _PROF_PROLOGUE
 150 #define ENTRY_NOPROFILE(name)   _ENTRY(_C_LABEL(name))
 151 #define ASENTRY(name)           _ENTRY(_ASM_LABEL(name)); _PROF_PROLOGUE
 152 #define FUNC(name)              ASENTRY(name)
 153 #define RODATA(name)            .align 4; .text; .globl _C_LABEL(name); \
 154                                 OTYPE(_C_LABEL(name)); _C_LABEL(name):
 155
 156
 157 #define ASMSTR                  .asciz
 158
 159 #ifdef __ELF__
 160 #define RCSID(name)             .pushsection ".ident"; .asciz name; .popsection
 161 #else
 162 #define RCSID(name)             .asciz name
 163 #endif
 164
 165 #ifdef NO_KERNEL_RCSIDS
 166 #define __KERNEL_RCSID(_n, _s)  /* nothing */
 167 #else
 168 #define __KERNEL_RCSID(_n, _s)  RCSID(_s)
 169 #endif
 170
 171 #ifdef __ELF__
 172 #define WEAK_ALIAS(alias,sym)                                           \
 173         .weak alias;                                                    \
 174         alias = sym
 175 #endif
 176 /*
 177  * STRONG_ALIAS: create a strong alias.
 178  */
 179 #define STRONG_ALIAS(alias,sym)                                         \
 180         .globl alias;                                                   \
 181         alias = sym
 182
 183 /*
 184  * WARN_REFERENCES: create a warning if the specified symbol is referenced.
 185  */
 186 #ifdef __ELF__
 187 #ifdef __STDC__
 188 #define WARN_REFERENCES(_sym,_msg)                              \
 189         .section .gnu.warning. ## _sym ; .ascii _msg ; .text
 190 #else
 191 #define WARN_REFERENCES(_sym,_msg)                              \
 192         .section .gnu.warning./**/_sym ; .ascii _msg ; .text
 193 #endif /* __STDC__ */
 194 #else
 195 #ifdef __STDC__
 196 #define __STRING(x)                     #x
 197 #define WARN_REFERENCES(sym,msg)                                        \
 198         .stabs msg ## ,30,0,0,0 ;                                       \
 199         .stabs __STRING(_ ## sym) ## ,1,0,0,0
 200 #else
 201 #define __STRING(x)                     "x"
 202 #define WARN_REFERENCES(sym,msg)                                        \
 203         .stabs msg,30,0,0,0 ;                                           \
 204         .stabs __STRING(_/**/sym),1,0,0,0
 205 #endif /* __STDC__ */
 206 #endif /* __ELF__ */
 207
 208 #endif /* _ASM_H_ */