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25 lines
734 B
25 lines
734 B
#ifndef __CALLBACK_H__
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#define __CALLBACK_H__
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/* This is a workaround for a bug in the current version of gcc:
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gcc assumes that no one will touch %a4 after it is set up in crt0.o.
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This isn't true if a function is called as a callback by something
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that wasn't compiled by gcc (like FrmCloseAllForms()). It may also
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not be true if it is used as a callback by something in a different
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shared library.
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We really want a function attribute "callback" which will insert this
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progloue and epilogoue automatically.
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- Ian */
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void *reg_a4 asm("%a4");
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#define CALLBACK_PROLOGUE \
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void *save_a4 = reg_a4; asm("move.l %%a5,%%a4; sub.l #edata,%%a4" : :);
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#define CALLBACK_EPILOGUE reg_a4 = save_a4;
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#endif
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