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RISCOS: Add an ELF plugin provider

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This will allow do dynamically load plugins and not be limited by
24-bits relocations
This commit is contained in:
Le Philousophe 2022-06-14 22:05:03 +02:00
parent 87f515a6e0
commit 02808a019a
7 changed files with 409 additions and 3 deletions
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71
backends/plugins/riscos/riscos-provider.cpp Normal file
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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program 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.
*
* This program 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#define FORBIDDEN_SYMBOL_ALLOW_ALL
#include "common/scummsys.h"
#if defined(DYNAMIC_MODULES) && defined(RISCOS)
#include "backends/plugins/riscos/riscos-provider.h"
#include "backends/plugins/elf/arm-loader.h"
#include "common/debug.h"
#include <kernel.h>
#include <swis.h>
typedef void (*Cache_CleanInvalidateRangePtr)(void *start, void *end);
// This function enters in supervisor mode, call the ARMop and leaves the supervisor mode
static void call_Cache_CleanInvalidateRange(void *start, void *end, Cache_CleanInvalidateRangePtr f) __asm__(".call_Cache_CleanInvalidateRange");
__asm__(
".call_Cache_CleanInvalidateRange:\n"
"PUSH {r4, lr}\n" // Backup r4 and lr
"MRS r4, cpsr\n" // Backup CPSR in R4
"SWI 0x16\n" // OS_EnterOS
"MOV lr, pc\n" //
"MOV pc, r2\n" // Call 3rd argument (function pointer)
"MSR cpsr_c, r4\n" // Restore CPSR (leave SVC mode)
"POP {r4, pc}\n" // Restore R4 and return
);
class RiscOSDLObject : public ARMDLObject {
protected:
void flushDataCache(void *ptr, uint32 len) const override {
Cache_CleanInvalidateRangePtr Cache_CleanInvalidateRange;
if (!_swix(OS_MMUControl, _IN(0)|_OUT(0), 2 | 21 << 8, &Cache_CleanInvalidateRange)) {
call_Cache_CleanInvalidateRange(ptr, (char *)ptr + len, Cache_CleanInvalidateRange);
return;
}
// OS_MMUControl 2 or Cache_CleanInvalidateRange are not supported: fallback to old inefficient OS_MMUControl 1
_swix(OS_MMUControl, _IN(0), 1 | 1 << 28 | 1 << 30 | 1 << 31);
}
};
Plugin *RiscOSPluginProvider::createPlugin(const Common::FSNode &node) const {
return new TemplatedELFPlugin<RiscOSDLObject>(node.getPath());
}
#endif // defined(DYNAMIC_MODULES) && defined(RISCOS)