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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
30 lines
950 B
C
30 lines
950 B
C
#ifndef COSMOPOLITAN_LIBC_PE_H_
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#define COSMOPOLITAN_LIBC_PE_H_
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#ifndef __STRICT_ANSI__
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#include "libc/dce.h"
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#include "libc/nt/pedef.h"
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#include "libc/nt/struct/imagedosheader.h"
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#include "libc/runtime/runtime.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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forceinline void *pecheckaddress(struct NtImageDosHeader *mz, size_t mzsize,
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void *addr, uint32_t addrsize) {
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#if !(TRUSTWORTHY + PE_TRUSTWORTHY + 0)
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if ((intptr_t)addr < (intptr_t)mz ||
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(intptr_t)addr + addrsize > (intptr_t)mz + mzsize) {
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abort();
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}
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#endif
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return addr;
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}
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forceinline void *pecomputerva(struct NtImageDosHeader *mz, size_t mzsize,
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uint32_t reladdr, uint32_t addrsize) {
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return pecheckaddress(mz, mzsize, (void *)((intptr_t)mz + reladdr), addrsize);
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}
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* !ANSI */
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#endif /* COSMOPOLITAN_LIBC_PE_H_ */
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