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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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49
third_party/getopt/getopt.c vendored
View file

@ -43,23 +43,18 @@ asm(".include \"libc/disclaimer.inc\"");
#include "libc/runtime/runtime.h"
#include "libc/stdio/stdio.h"
STATIC_YOINK("_init_getopt");
#define BADCH (int)'?'
#define BADARG (int)':'
int opterr, /* if error message should be printed */
optind, /* index into parent argv vector */
optopt, /* character checked for validity */
optreset; /* reset getopt */
char *optarg; /* argument associated with option */
static char *place; /* option letter processing */
#define BADCH (int)'?'
#define BADARG (int)':'
static char EMSG[] = { '\0' };
INITIALIZER(300, _init_getopt, {
opterr = 1;
optind = 1;
place = EMSG;
});
char *getopt_place; /* option letter processing */
char kGetoptEmsg[1];
/*
* getopt --
@ -77,35 +72,35 @@ getopt(int nargc, char * const nargv[], const char *ostr)
if (optind == 0)
optind = 1;
if (optreset || *place == 0) { /* update scanning pointer */
if (optreset || *getopt_place == 0) { /* update scanning pointer */
optreset = 0;
place = nargv[optind];
if (optind >= nargc || *place++ != '-') {
getopt_place = nargv[optind];
if (optind >= nargc || *getopt_place++ != '-') {
/* Argument is absent or is not an option */
place = EMSG;
getopt_place = kGetoptEmsg;
return (-1);
}
optopt = *place++;
if (optopt == '-' && *place == 0) {
optopt = *getopt_place++;
if (optopt == '-' && *getopt_place == 0) {
/* "--" => end of options */
++optind;
place = EMSG;
getopt_place = kGetoptEmsg;
return (-1);
}
if (optopt == 0) {
/* Solitary '-', treat as a '-' option
if the program (eg su) is looking for it. */
place = EMSG;
getopt_place = kGetoptEmsg;
if (strchr(ostr, '-') == NULL)
return (-1);
optopt = '-';
}
} else
optopt = *place++;
optopt = *getopt_place++;
/* See if option letter is one the caller wanted... */
if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
if (*place == 0)
if (*getopt_place == 0)
++optind;
if (opterr && *ostr != ':')
fprintf(stderr,
@ -118,18 +113,18 @@ getopt(int nargc, char * const nargv[], const char *ostr)
if (oli[1] != ':') {
/* don't need argument */
optarg = NULL;
if (*place == 0)
if (*getopt_place == 0)
++optind;
} else {
/* Option-argument is either the rest of this argument or the
entire next argument. */
if (*place)
optarg = place;
if (*getopt_place)
optarg = getopt_place;
else if (nargc > ++optind)
optarg = nargv[optind];
else {
/* option-argument absent */
place = EMSG;
getopt_place = kGetoptEmsg;
if (*ostr == ':')
return (BADARG);
if (opterr)
@ -138,7 +133,7 @@ getopt(int nargc, char * const nargv[], const char *ostr)
program_invocation_name, optopt);
return (BADCH);
}
place = EMSG;
getopt_place = kGetoptEmsg;
++optind;
}
return (optopt); /* return option letter */