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68 lines
2.5 KiB
C
68 lines
2.5 KiB
C
/*
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Copyright 2015 Wolfgang Thaller.
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This file is part of Retro68.
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Retro68 is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Retro68 is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>.
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*/
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#define _RETRO68_GET_DISPLACEMENT(DISPLACEMENT, STRIP) \
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do { \
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char *virtualstart, *realstart; \
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__asm__( "1:\n" \
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"\tmove.l #1b, %0\n" \
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"\tlea (1b:w,%%pc), %1" \
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: "=r"(virtualstart) , "=a"(realstart) ); \
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DISPLACEMENT = STRIP(realstart) - virtualstart; \
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} while(0)
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#define RETRO68_GET_DISPLACEMENT(DISPLACEMENT) \
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_RETRO68_GET_DISPLACEMENT(DISPLACEMENT, )
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// Calls to the StripAddress() trap are supposed to make sure addresses are 32-bit clean.
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// But this trap doesn’t exist on old ROMs and old system versions,
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// so programs built with StripAddress will mysteriously crash.
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// Those systems always run in 24-bit mode, so we can just take the lower 24
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// bits of the 32 bit address.
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// StripAddress24 must not be used on 32-bit systems, or the resulting crashes
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// will be even more mysterious.
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#define StripAddress24(x) ((char*) ((unsigned long)(x) & 0x00FFFFFF))
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#define RETRO68_GET_DISPLACEMENT_STRIP24(DISPLACEMENT) \
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_RETRO68_GET_DISPLACEMENT(DISPLACEMENT, StripAddress24)
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// original StripAddress
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#define RETRO68_GET_DISPLACEMENT_STRIP(DISPLACEMENT) \
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_RETRO68_GET_DISPLACEMENT(DISPLACEMENT, StripAddress)
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#define RETRO68_CALL_UNRELOCATED(FUN,ARGS) \
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do { \
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long displacement; \
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RETRO68_GET_DISPLACEMENT(displacement); \
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(*(typeof(&FUN)) ((char*)(&FUN) + displacement)) ARGS; \
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} while(0)
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void Retro68Relocate();
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void Retro68CallConstructors();
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void Retro68CallDestructors();
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void Retro68FreeGlobals();
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#define RETRO68_RELOCATE() RETRO68_CALL_UNRELOCATED(Retro68Relocate,())
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