bfe5ae413f
* m68k/asm.h: Add macros for -fPIC, -msep-data and
-mid-shared-library support.
* m68k/crt0.S: Use macros for -fPIC, -msep-data and
-mid-shared-library support.
* m68k/sim-crt0.S: Likewise.
155 lines
3.8 KiB
C
155 lines
3.8 KiB
C
/* asm.h -- macros for m68k asm
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*
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* Copyright (c) 1995, 1996 Cygnus Support
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice is included verbatim in any distributions. No written agreement,
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* license, or royalty fee is required for any of the authorized uses.
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* Modifications to this software may be copyrighted by their authors
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* and need not follow the licensing terms described here, provided that
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* the new terms are clearly indicated on the first page of each file where
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* they apply.
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*/
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#if 0
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/*
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* XXX __USER_LABEL_PREFIX__ and __REGISTER_PREFIX__ do not work on gcc 2.7.0-3
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* XXX The following ifdef magic fixes the problem but results in a warning
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* XXX when compiling assembly code.
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*/
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#ifndef __USER_LABEL_PREFIX__
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/* #define __USER_LABEL_PREFIX__ "" /* no underscore for coff */
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#define __USER_LABEL_PREFIX__ _ /* leading underscore for aout */
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#endif
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#ifndef __REGISTER_PREFIX__
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#define __REGISTER_PREFIX__ /* never has anything prefixed */
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#endif
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#endif
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/*
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* some assemblers choke on '#' as an immediate value. As gcc can also
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* use '&', use that in those cases.
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*/
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#ifndef __IMMEDIATE_PREFIX__
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#define __IMMEDIATE_PREFIX__ #
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#endif
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/* ANSI concatenation macros. */
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#define CONCAT1(a, b) CONCAT2(a, b)
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#define CONCAT2(a, b) a ## b
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/* use the right prefix for global labels. */
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#define SYM(x) CONCAT1 (__USER_LABEL_PREFIX__,x)
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/* use the right prefix for registers. */
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#define REG(x) CONCAT1 (__REGISTER_PREFIX__,x)
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/* use the right prefix for immediate values. */
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#define IMM(x) CONCAT1 (__IMMEDIATE_PREFIX__,x)
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/* use the right prefix for register names */
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#define d0 REG (d0)
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#define d1 REG (d1)
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#define d2 REG (d2)
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#define d3 REG (d3)
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#define d4 REG (d4)
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#define d5 REG (d5)
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#define d6 REG (d6)
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#define d7 REG (d7)
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#define a0 REG (a0)
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#define a1 REG (a1)
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#define a2 REG (a2)
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#define a3 REG (a3)
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#define a4 REG (a4)
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#define a5 REG (a5)
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#define a6 REG (a6)
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#define a7 REG (a7)
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#define fp REG (fp)
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#define fp0 REG (fp0)
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#define fp1 REG (fp1)
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#define fp2 REG (fp2)
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#define fp3 REG (fp3)
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#define fp4 REG (fp4)
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#define fp5 REG (fp5)
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#define fp6 REG (fp6)
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#define fp7 REG (fp7)
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#define sp REG (sp)
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#define usp REG (usp)
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#define vbr REG (vbr)
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#define sr REG (sr)
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#define fpcr REG (fpcr)
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#define fpsr REG (fpsr)
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#define fpi REG (fpi)
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/* Provide a few macros to allow for PIC code support.
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* With PIC, data is stored A5 relative so we've got to take a bit of special
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* care to ensure that all loads of global data is via A5. PIC also requires
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* jumps and subroutine calls to be PC relative rather than absolute. We cheat
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* a little on this and in the PIC case, we use short offset branches and
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* hope that the final object code is within range (which it should be).
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*/
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#ifndef __PIC__
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/* Non PIC (absolute/relocatable) versions */
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.macro PICCALL addr
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jbsr \addr
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.endm
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.macro PICJUMP addr
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jmp \addr
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.endm
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.macro PICLEA sym, reg
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lea \sym, \reg
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.endm
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.macro PICPEA sym, areg
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pea \sym
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.endm
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#else /* __PIC__ */
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/* Common for -mid-shared-libary and -msep-data */
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.macro PICCALL addr
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bsr \addr
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.endm
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.macro PICJUMP addr
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bra \addr
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.endm
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# if defined(__ID_SHARED_LIBRARY__)
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/* -mid-shared-library versions */
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.macro PICLEA sym, reg
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movel a5@(_current_shared_library_a5_offset_), \reg
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movel \sym@GOT(\reg), \reg
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.endm
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.macro PICPEA sym, areg
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movel a5@(_current_shared_library_a5_offset_), \areg
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movel \sym@GOT(\areg), sp@-
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.endm
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# else /* !__ID_SHARED_LIBRARY__ */
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/* Versions for -msep-data */
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.macro PICLEA sym, reg
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movel \sym@GOT(a5), \reg
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.endm
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.macro PICPEA sym, areg
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movel \sym@GOT(a5), sp@-
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.endm
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# endif /* !__ID_SHARED_LIBRARY__ */
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#endif /* __PIC__ */
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