mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-25 14:34:29 +00:00
97 lines
3.4 KiB
C
97 lines
3.4 KiB
C
/*
|
||
Copyright 2017 Wolfgang Thaller.
|
||
|
||
This file is part of Retro68.
|
||
|
||
Retro68 is free software: you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation, either version 3 of the License, or
|
||
(at your option) any later version.
|
||
|
||
Retro68 is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
Under Section 7 of GPL version 3, you are granted additional
|
||
permissions described in the GCC Runtime Library Exception, version
|
||
3.1, as published by the Free Software Foundation.
|
||
|
||
You should have received a copy of the GNU General Public License and
|
||
a copy of the GCC Runtime Library Exception along with this program;
|
||
see the files COPYING and COPYING.RUNTIME respectively. If not, see
|
||
<http://www.gnu.org/licenses/>.
|
||
*/
|
||
|
||
#include <stdint.h>
|
||
#include <Types.h>
|
||
|
||
#define _RETRO68_GET_DISPLACEMENT(DISPLACEMENT, STRIP) \
|
||
do { \
|
||
char *virtualstart, *realstart; \
|
||
__asm__( "1:\n" \
|
||
"\tmove.l #1b, %0\n" \
|
||
"\tlea (1b:w,%%pc), %1" \
|
||
: "=r"(virtualstart) , "=a"(realstart) ); \
|
||
DISPLACEMENT = STRIP(realstart) - virtualstart; \
|
||
} while(0)
|
||
|
||
#define RETRO68_GET_DISPLACEMENT(DISPLACEMENT) \
|
||
_RETRO68_GET_DISPLACEMENT(DISPLACEMENT, )
|
||
|
||
// Calls to the StripAddress() trap are supposed to make sure addresses are 32-bit clean.
|
||
// But this trap doesn’t exist on old ROMs and old system versions,
|
||
// so programs built with StripAddress will mysteriously crash.
|
||
// Those systems always run in 24-bit mode, so we can just take the lower 24
|
||
// bits of the 32 bit address.
|
||
// StripAddress24 must not be used on 32-bit systems, or the resulting crashes
|
||
// will be even more mysterious.
|
||
|
||
#define StripAddress24(x) ((char*) ((unsigned long)(x) & 0x00FFFFFF))
|
||
#define RETRO68_GET_DISPLACEMENT_STRIP24(DISPLACEMENT) \
|
||
_RETRO68_GET_DISPLACEMENT(DISPLACEMENT, StripAddress24)
|
||
|
||
// original StripAddress
|
||
#define RETRO68_GET_DISPLACEMENT_STRIP(DISPLACEMENT) \
|
||
_RETRO68_GET_DISPLACEMENT(DISPLACEMENT, StripAddress)
|
||
|
||
#define RETRO68_CALL_UNRELOCATED(FUN,ARGS) \
|
||
do { \
|
||
long displacement; \
|
||
RETRO68_GET_DISPLACEMENT(displacement); \
|
||
(*(typeof(&FUN)) ((char*)(&FUN) + displacement)) ARGS; \
|
||
} while(0)
|
||
|
||
void Retro68Relocate();
|
||
void Retro68CallConstructors();
|
||
void Retro68CallDestructors();
|
||
void Retro68FreeGlobals();
|
||
void Retro68InitMultisegApp();
|
||
void Retro68ApplyRelocations(uint8_t *base, uint32_t size, void *relocations, uint32_t displacements[]);
|
||
|
||
#define RETRO68_RELOCATE() RETRO68_CALL_UNRELOCATED(Retro68Relocate,())
|
||
|
||
|
||
|
||
/*
|
||
struct object is an internal data structure in libgcc.
|
||
Comments in unwind-dw2-fde.h imply that it will not
|
||
increase in size.
|
||
*/
|
||
struct object { long space[8]; };
|
||
|
||
extern void __register_frame_info (const void *, struct object *)
|
||
__attribute__ ((weak));
|
||
extern void *__deregister_frame_info (const void *)
|
||
__attribute__ ((weak));
|
||
|
||
typedef struct Retro68RelocState
|
||
{
|
||
Ptr bssPtr;
|
||
Handle codeHandle;
|
||
char hasStripAddr;
|
||
char hasFlushCodeCache;
|
||
} Retro68RelocState;
|
||
|
||
extern Retro68RelocState relocState;
|