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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
26 lines
651 B
C
26 lines
651 B
C
#ifndef COSMOPOLITAN_LIBC_STR_TPDECODE_H_
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#define COSMOPOLITAN_LIBC_STR_TPDECODE_H_
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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int tpdecode(const char *, wint_t *) paramsnonnull((1)) libcesque;
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#ifndef __STRICT_ANSI__
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#define tpdecode(S, OUT) __tpdecode(S, OUT)
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forceinline int __tpdecode(const char *s, wint_t *out) {
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int ax;
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if (0 <= *s && *s <= 0x7f) {
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*out = *s;
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return 1;
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}
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asm("call\ttpdecode"
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: "=a"(ax), "=m"(*(char(*)[6])s)
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: "D"(s), "S"(out)
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: "cc");
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return ax;
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}
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#endif
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_STR_TPDECODE_H_ */
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