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