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f4f4caab0e
I wanted a tiny scriptable meltdown proof way to run userspace programs and visualize how program execution impacts memory. It helps to explain how things like Actually Portable Executable works. It can show you how the GCC generated code is going about manipulating matrices and more. I didn't feel fully comfortable with Qemu and Bochs because I'm not smart enough to understand them. I wanted something like gVisor but with much stronger levels of assurances. I wanted a single binary that'll run, on all major operating systems with an embedded GPL barrier ZIP filesystem that is tiny enough to transpile to JavaScript and run in browsers too. https://justine.storage.googleapis.com/emulator625.mp4
33 lines
1.1 KiB
C
33 lines
1.1 KiB
C
#ifndef COSMOPOLITAN_LIBC_RUNTIME_MEMTRACK_H_
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#define COSMOPOLITAN_LIBC_RUNTIME_MEMTRACK_H_
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#include "libc/nexgen32e/vendor.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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#define kMappingsSize 0x100000000000 /* 16TB */
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#define kMappingsStart (IsGenuineCosmo() ? 0x300000000000 : 0x200000000000)
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#define kFixedMappingsStart 0x0000100000000000
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#define kFixedMappingsSize kMappingsSize
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struct MemoryIntervals {
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int i;
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struct MemoryInterval {
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int x;
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int y;
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} p[32];
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long h[32];
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};
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extern struct MemoryIntervals _mmi;
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unsigned FindMemoryInterval(const struct MemoryIntervals *, int) nosideeffect;
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bool AreMemoryIntervalsOk(const struct MemoryIntervals *) nosideeffect;
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void PrintMemoryIntervals(int, const struct MemoryIntervals *);
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int TrackMemoryInterval(struct MemoryIntervals *, int, int, long);
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int ReleaseMemoryIntervals(struct MemoryIntervals *, int, int,
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void (*)(struct MemoryIntervals *, int, int));
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void ReleaseMemoryNt(struct MemoryIntervals *, int, int);
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_RUNTIME_MEMTRACK_H_ */
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