130 lines
3.8 KiB
C++
130 lines
3.8 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program 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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*
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* This program 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#define FORBIDDEN_SYMBOL_ALLOW_ALL
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#include "common/scummsys.h"
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#if defined(DYNAMIC_MODULES) && defined(RISCOS)
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#include "backends/plugins/riscos/riscos-provider.h"
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#include "backends/plugins/elf/arm-loader.h"
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#include "common/debug.h"
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#include <kernel.h>
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#include <swis.h>
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// HACK: These two function are part of private API in libunixlib
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// They let allocate and free data in the application space where the stack is placed below 64MB
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// When using malloc with big chunks we end up in memory mapped areas above 64MB
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extern "C" {
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extern void *__stackalloc (size_t __size);
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extern void __stackfree (void *__ptr);
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}
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// HACK: This is needed so that standard library functions that are only
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// used in plugins can be found in the main executable.
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void pluginHack() {
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volatile float f = 0.0f;
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volatile double d = 0.0;
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volatile int i = 0;
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byte *b = new (std::nothrow) byte[100];
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f = tanhf(f);
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f = logf(f);
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f = log10f(f);
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f = lroundf(f);
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f = expf(f);
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f = frexpf(f, NULL);
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f = ldexpf(f, 1);
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f = fmaxf(f, f);
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f = fminf(f, f);
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f = truncf(f);
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d = nearbyint(d);
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i = strcoll("dummyA", "dummyB");
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rename("dummyA", "dummyB");
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delete[] b;
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}
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class RiscOSDLObject : public ARMDLObject {
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protected:
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void flushDataCache(void *ptr, uint32 len) const override {
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_kernel_swi_regs regs;
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regs.r[0] = 1;
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regs.r[1] = (int)ptr;
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regs.r[2] = (int)ptr + len;
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_kernel_swi(OS_SynchroniseCodeAreas, ®s, ®s);
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}
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};
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/**
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* On 26-bit RISC OS, plugins need to be allocated in the first 64 MB
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* of RAM so that it can be executed. This may not be the case when using
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* the default allocators, which use dynamic areas for large allocations.
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*/
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class RiscOSDLObject_AS : public RiscOSDLObject {
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protected:
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void *allocateMemory(uint32 align, uint32 size) override {
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// Allocate with worst case alignment in application space
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void *p = __stackalloc(size + sizeof(uintptr) + align - 1);
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void *np = (void *)(((uintptr)p + align - 1) & (-align));
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*(uintptr *)((byte *)np + size) = (uintptr)p;
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debug(8, "Allocated %p while alignment was %d: using %p", p, align, np);
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return np;
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}
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void deallocateMemory(void *ptr, uint32 size) override {
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void *p = (void *)*(uintptr *)((byte *)ptr + size);
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debug(8, "Freeing %p which was allocated at %p", ptr, p);
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__stackfree(p);
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}
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};
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RiscOSPluginProvider::RiscOSPluginProvider() : _is32bit(false) {
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__asm__ volatile (
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"SUBS %[is32bit], r0, r0\n\t" /* Set at least one status flag and set is32bits to 0 */
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"TEQ pc, pc\n\t" /* First operand never contains flags while second one contains them in 26-bits only */
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"MOVEQ %[is32bit], #1\n\t" /* Set to 1 only if EQ flag is set */
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: [is32bit] "=r" (_is32bit)
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: /* no inputs */
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: "cc");
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}
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Plugin *RiscOSPluginProvider::createPlugin(const Common::FSNode &node) const {
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if (_is32bit) {
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return new TemplatedELFPlugin<RiscOSDLObject>(node.getPath());
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} else {
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return new TemplatedELFPlugin<RiscOSDLObject_AS>(node.getPath());
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}
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}
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#endif // defined(DYNAMIC_MODULES) && defined(RISCOS)
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