libgloss/m68k/asm.h

   1 /* asm.h -- macros for m68k asm
   2  *
   3  * Copyright (c) 1995, 1996 Cygnus Support
   4  *
   5  * The authors hereby grant permission to use, copy, modify, distribute,
   6  * and license this software and its documentation for any purpose, provided
   7  * that existing copyright notices are retained in all copies and that this
   8  * notice is included verbatim in any distributions. No written agreement,
   9  * license, or royalty fee is required for any of the authorized uses.
  10  * Modifications to this software may be copyrighted by their authors
  11  * and need not follow the licensing terms described here, provided that
  12  * the new terms are clearly indicated on the first page of each file where
  13  * they apply.
  14  */
  15
  16 #if 0
  17 /*
  18  * XXX __USER_LABEL_PREFIX__ and __REGISTER_PREFIX__ do not work on gcc 2.7.0-3
  19  * XXX The following ifdef magic fixes the problem but results in a warning
  20  * XXX when compiling assembly code.
  21  */
  22 #ifndef __USER_LABEL_PREFIX__
  23 /* #define __USER_LABEL_PREFIX__ ""     /* no underscore for coff */
  24 #define __USER_LABEL_PREFIX__ _         /* leading underscore for aout */
  25 #endif
  26
  27 #ifndef __REGISTER_PREFIX__
  28 #define __REGISTER_PREFIX__             /* never has anything prefixed */
  29 #endif
  30 #endif
  31
  32 /*
  33  * some assemblers choke on '#' as an immediate value. As gcc can also
  34  * use '&', use that in those cases.
  35  */
  36 #ifndef __IMMEDIATE_PREFIX__
  37 #define __IMMEDIATE_PREFIX__ #
  38 #endif
  39
  40 /* ANSI concatenation macros.  */
  41 #define CONCAT1(a, b) CONCAT2(a, b)
  42 #define CONCAT2(a, b) a ## b
  43
  44 /* use the right prefix for global labels.  */
  45 #define SYM(x) CONCAT1 (__USER_LABEL_PREFIX__,x)
  46
  47 /* use the right prefix for registers.  */
  48 #define REG(x) CONCAT1 (__REGISTER_PREFIX__,x)
  49
  50 /* use the right prefix for immediate values.  */
  51 #define IMM(x) CONCAT1 (__IMMEDIATE_PREFIX__,x)
  52
  53 /* use the right prefix for register names */
  54 #define d0 REG (d0)
  55 #define d1 REG (d1)
  56 #define d2 REG (d2)
  57 #define d3 REG (d3)
  58 #define d4 REG (d4)
  59 #define d5 REG (d5)
  60 #define d6 REG (d6)
  61 #define d7 REG (d7)
  62 #define a0 REG (a0)
  63 #define a1 REG (a1)
  64 #define a2 REG (a2)
  65 #define a3 REG (a3)
  66 #define a4 REG (a4)
  67 #define a5 REG (a5)
  68 #define a6 REG (a6)
  69 #define a7 REG (a7)
  70 #define fp REG (fp)
  71 #define fp0 REG (fp0)
  72 #define fp1 REG (fp1)
  73 #define fp2 REG (fp2)
  74 #define fp3 REG (fp3)
  75 #define fp4 REG (fp4)
  76 #define fp5 REG (fp5)
  77 #define fp6 REG (fp6)
  78 #define fp7 REG (fp7)
  79 #define sp REG (sp)
  80 #define usp REG (usp)
  81 #define vbr REG (vbr)
  82 #define mbb REG (mbb)
  83 #define sr REG (sr)
  84 #define fpcr REG (fpcr)
  85 #define fpsr REG (fpsr)
  86 #define fpi REG (fpi)
  87
  88 /* Provide a few macros to allow for PIC code support.
  89  * With PIC, data is stored A5 relative so we've got to take a bit of special
  90  * care to ensure that all loads of global data is via A5.  PIC also requires
  91  * jumps and subroutine calls to be PC relative rather than absolute.  We cheat
  92  * a little on this and in the PIC case, we use short offset branches and
  93  * hope that the final object code is within range (which it should be).
  94  */
  95 #ifndef __PIC__
  96
  97         /* Non PIC (absolute/relocatable) versions */
  98
  99         .macro PICCALL addr
 100         jbsr    \addr
 101         .endm
 102
 103         .macro PICJUMP addr
 104         jmp     \addr
 105         .endm
 106
 107         .macro PICLEA sym, reg
 108         lea     \sym, \reg
 109         .endm
 110
 111         .macro PICPEA sym, areg
 112         pea     \sym
 113         .endm
 114
 115 #else /* __PIC__ */
 116
 117         /* Common for -mid-shared-libary and -msep-data */
 118
 119         .macro PICCALL addr
 120         bsr     \addr
 121         .endm
 122
 123         .macro PICJUMP addr
 124         bra     \addr
 125         .endm
 126
 127 # if defined(__ID_SHARED_LIBRARY__)
 128
 129         /* -mid-shared-library versions  */
 130
 131         .macro PICLEA sym, reg
 132         movel   a5@(_current_shared_library_a5_offset_), \reg
 133         movel   \sym@GOT(\reg), \reg
 134         .endm
 135
 136         .macro PICPEA sym, areg
 137         movel   a5@(_current_shared_library_a5_offset_), \areg
 138         movel   \sym@GOT(\areg), sp@-
 139         .endm
 140
 141 # else /* !__ID_SHARED_LIBRARY__ */
 142
 143         /* Versions for -msep-data */
 144
 145         .macro PICLEA sym, reg
 146         movel   \sym@GOT(a5), \reg
 147         .endm
 148
 149         .macro PICPEA sym, areg
 150         movel   \sym@GOT(a5), sp@-
 151         .endm
 152
 153 # endif /* !__ID_SHARED_LIBRARY__ */
 154 #endif /* __PIC__ */
 155