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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
55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
#ifndef COSMOPOLITAN_LIBC_NEXGEN32E_TINYSTRLEN_H_
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#define COSMOPOLITAN_LIBC_NEXGEN32E_TINYSTRLEN_H_
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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#if !defined(__GNUC__) || defined(__STRICT_ANSI__)
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int tinystrlen(const char *);
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int tinystrnlen(const char *, size_t);
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int tinystrlen16(const char16_t *);
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int tinystrnlen16(const char16_t *, size_t);
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int tinywcslen(const wchar_t *);
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int tinywcsnlen(const wchar_t *, size_t);
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#else
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forceinline int tinystrlen(const char *s) {
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unsigned ax;
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asm("call\ttinystrlen" : "=a"(ax) : "D"(s), "m"(*(char(*)[PAGESIZE])s));
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return ax;
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}
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forceinline int tinystrnlen(const char *s, size_t n) {
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unsigned ax;
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asm("call\ttinystrnlen" : "=a"(ax) : "D"(s), "S"(n), "m"(*(char(*)[n])s));
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return ax;
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}
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forceinline int tinystrlen16(const char16_t *s) {
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unsigned ax;
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asm("call\ttinystrlen16" : "=a"(ax) : "D"(s), "m"(*(char16_t(*)[PAGESIZE])s));
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return ax;
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}
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forceinline int tinystrnlen16(const char16_t *s, size_t n) {
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unsigned ax;
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asm("call\ttinystrnlen16"
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: "=a"(ax)
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: "D"(s), "S"(n), "m"(*(char16_t(*)[n])s));
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return ax;
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}
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forceinline int tinywcslen(const wchar_t *s) {
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unsigned ax;
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asm("call\ttinywcslen" : "=a"(ax) : "D"(s), "m"(*(wchar_t(*)[PAGESIZE])s));
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return ax;
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}
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forceinline int tinywcsnlen(const wchar_t *s, size_t n) {
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unsigned ax;
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asm("call\ttinywcsnlen" : "=a"(ax) : "D"(s), "S"(n), "m"(*(wchar_t(*)[n])s));
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return ax;
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}
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#endif
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_NEXGEN32E_TINYSTRLEN_H_ */
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