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Henrik RydgårdandClaude Opus 5.5
60c06d4f03
On iOS, the base search stepped up from 0x100000000 in 8MB increments, right through the app's binary and early heap: about 100 failed vm_remaps (each logged twice) every time a game started. On macOS, Find4GBBase freed its probe allocation before the views were mapped. Now the kernel picks a free range of exactly the span the views need, which stays reserved and inaccessible, and the views are mapped over it with VM_FLAGS_OVERWRITE. One try, no race, and the gaps between views fault. Unmasked (macOS), ask for 4GB alignment first, which lets the ARM64 JIT pointerify. The old search remains as a fallback. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
68 lines
2.0 KiB
C++
68 lines
2.0 KiB
C++
// Copyright (C) 2003 Dolphin Project.
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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, version 2.0 or later versions.
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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 2.0 for more details.
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// A copy of the GPL 2.0 should have been included with the program.
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// If not, see http://www.gnu.org/licenses/
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// Official SVN repository and contact information can be found at
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// http://code.google.com/p/dolphin-emu/
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#pragma once
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#include <cstdint>
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#ifdef _WIN32
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#include "CommonWindows.h"
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#elif defined(__APPLE__)
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#include <mach/mach.h>
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#endif
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#include "Common/CommonTypes.h"
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// This class lets you create a block of anonymous RAM, and then arbitrarily map views into it.
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// Multiple views can mirror the same section of the block, which makes it very convient for emulating
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// memory mirrors.
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struct MemArenaData;
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class MemArena {
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public:
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size_t roundup(size_t x);
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bool GrabMemSpace(size_t size);
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void ReleaseSpace();
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void *CreateView(s64 offset, size_t size, void *base = 0);
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void ReleaseView(s64 offset, void *view, size_t size);
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// This only finds 1 GB in 32-bit
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u8 *Find4GBBase();
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bool NeedsProbing();
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#if defined(__APPLE__)
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// Asks the kernel for a free range of this size for the views, and keeps it reserved (inaccessible), so
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// CreateView can map over it without anything else taking it in between. ReleaseSpace releases it too.
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// alignMask: the address bits that must be zero.
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u8 *ReserveViewSpace(size_t size, size_t alignMask);
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void ReleaseViewSpace();
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#endif
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private:
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#ifdef _WIN32
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HANDLE hMemoryMapping;
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SYSTEM_INFO sysInfo;
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#elif defined(__APPLE__)
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size_t vm_size;
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vm_address_t vm_mem; // same type as vm_address_t
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vm_address_t reserved_mem = 0;
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size_t reserved_size = 0;
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#else
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int fd = -1;
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#endif
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};
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