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Diffstat (limited to 'backends/plugins/3ds/3ds-provider.cpp')
| -rw-r--r-- | backends/plugins/3ds/3ds-provider.cpp | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/backends/plugins/3ds/3ds-provider.cpp b/backends/plugins/3ds/3ds-provider.cpp new file mode 100644 index 0000000000..fd813669a5 --- /dev/null +++ b/backends/plugins/3ds/3ds-provider.cpp @@ -0,0 +1,127 @@ +/* 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 2 + * 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, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + */ + +#define FORBIDDEN_SYMBOL_ALLOW_ALL +#include "common/scummsys.h" + +#if defined(DYNAMIC_MODULES) && defined(__3DS__) + +#include "backends/plugins/3ds/3ds-provider.h" +#include "backends/plugins/elf/arm-loader.h" + +#include "common/debug.h" + +#include <3ds.h> + +extern uint32 __end__; // End of the main program in memory. Set by the linker. + +static uint32 alignUp(uint32 ptr, uint32 align) { + return (ptr + align - 1) & ~(align - 1); +} + +class CTRDLObject : public ARMDLObject { +public: + CTRDLObject(): + ARMDLObject(), + _segmentHeapAddress(0) { + } + +protected: + static const uint32 kPageSize = 0x1000; + + uint32 _segmentHeapAddress; + + void flushDataCache(void *ptr, uint32 len) const override { + svcFlushProcessDataCache(CUR_PROCESS_HANDLE, ptr, len); + } + + void protectMemory(void *ptr, uint32 len, int prot) const override { + debug(2, "elfloader: Protecting memory at %p, len %d with %d", ptr, len, prot); + + uint32 ctrFlags = 0; + if (prot & PF_R) ctrFlags |= MEMPERM_READ; + if (prot & PF_W) ctrFlags |= MEMPERM_WRITE; + if (prot & PF_X) ctrFlags |= MEMPERM_EXECUTE; + + // The kernel expects the range to be aligned to page boundaries + len = alignUp(len, kPageSize); + + Handle currentHandle; + svcDuplicateHandle(¤tHandle, CUR_PROCESS_HANDLE); + svcControlProcessMemory(currentHandle, (uint32)ptr, 0, len, MEMOP_PROT, ctrFlags); + svcCloseHandle(currentHandle); + } + + void *allocateMemory(uint32 align, uint32 size) override { + assert(!_segmentHeapAddress); // At the moment we can only load a single segment + + _segmentHeapAddress = (uint32)ARMDLObject::allocateMemory(align, size); + if (!_segmentHeapAddress) { + return nullptr; + } + + size = alignUp(size, kPageSize); + + // The plugin needs to be loaded near the main executable for PC-relative calls + // to resolve. The segment is allocated on the heap which not in the +/-32 MB + // range of the main executable. So here we map the segment address in the heap + // to a virtual address just after the main executable. + uint32 segmentNearAddress = alignUp((uint32)&__end__, kPageSize) + kPageSize; + + Handle currentHandle; + svcDuplicateHandle(¤tHandle, CUR_PROCESS_HANDLE); + Result mapResult = svcControlProcessMemory(currentHandle, segmentNearAddress, _segmentHeapAddress, size, MEMOP_MAP, MemPerm(MEMPERM_READ | MEMPERM_WRITE)); + svcCloseHandle(currentHandle); + + if (mapResult != 0) { + warning("elfloader: unable to map segment memory (%x) near the excutable (%x)", _segmentHeapAddress, segmentNearAddress); + + ARMDLObject::deallocateMemory((void *)_segmentHeapAddress, size); + _segmentHeapAddress = 0; + return nullptr; + } + + return (void *)segmentNearAddress; + } + + void deallocateMemory(void *ptr, uint32 size) override { + assert(_segmentHeapAddress); + + uint32 alignedSize = alignUp(size, kPageSize); + + Handle currentHandle; + svcDuplicateHandle(¤tHandle, CUR_PROCESS_HANDLE); + svcControlProcessMemory(currentHandle, (uint32)ptr, _segmentHeapAddress, alignedSize, MEMOP_UNMAP, MemPerm(MEMPERM_READ | MEMPERM_WRITE)); + svcCloseHandle(currentHandle); + + ARMDLObject::deallocateMemory((void *)_segmentHeapAddress, size); + + _segmentHeapAddress = 0; + } + +}; + +Plugin *CTRPluginProvider::createPlugin(const Common::FSNode &node) const { + return new TemplatedELFPlugin<CTRDLObject>(node.getPath()); +} + +#endif // defined(DYNAMIC_MODULES) && defined(__3DS__) |