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Add x86_64-linux-gnu emulator

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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
This commit is contained in:
Justine Tunney 2020-08-25 04:23:25 -07:00
parent 467504308a
commit f4f4caab0e
1052 changed files with 65667 additions and 7825 deletions
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24
libc/stdio/stdio.h
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@ -10,17 +10,17 @@ COSMOPOLITAN_C_START_
╚────────────────────────────────────────────────────────────────────────────│*/
typedef struct FILE {
uint8_t bufmode; /* 0: _IOFBF, etc. (ignored if fd is -1) */
bool noclose; /* 1: for fake dup() */
uint32_t iomode; /* 4: O_RDONLY, etc. (ignored if fd is -1) */
int32_t state; /* 8: 0=OK, -1=EOF, >0=errno */
int fd; /* 12: ≥0=fd, -1=closed|buffer */
uint32_t beg; /* 16 */
uint32_t end; /* 20 */
uint8_t *buf; /* 24 */
size_t size; /* 32 */
int (*reader)(struct FILE *f); /* 40 */
int (*writer)(struct FILE *f); /* 48 */
uint8_t bufmode; // 0x00 _IOFBF, etc. (ignored if fd=-1)
bool noclose; // 0x01 for fake dup()
uint32_t iomode; // 0x04 O_RDONLY, etc. (ignored if fd=-1)
int32_t state; // 0x08 0=OK, -1=EOF, >0=errno
int fd; // 0x0c ≥0=fd, -1=closed|buffer
uint32_t beg; // 0x10
uint32_t end; // 0x14
uint8_t *buf; // 0x18
size_t size; // 0x20
int (*reader)(struct FILE *); // 0x28
int (*writer)(struct FILE *); // 0x30
} FILE;
extern FILE *stdin;
@ -35,7 +35,7 @@ int putc(int, FILE *) paramsnonnull();
int fflush(FILE *);
int fgetc(FILE *) paramsnonnull();
int ungetc(int, FILE *) paramsnonnull();
int fileno(FILE *) paramsnonnull();
int fileno(FILE *) paramsnonnull() nosideeffect;
int fputc(int, FILE *) paramsnonnull();
int fputs(const char *, FILE *) paramsnonnull();
int fputws(const wchar_t *, FILE *) paramsnonnull();