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Add x86_64-linux-gnu emulator
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
parent
467504308a
commit
f4f4caab0e
1052 changed files with 65667 additions and 7825 deletions
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@ -431,40 +431,40 @@
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/*
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* Evaluate a command.
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*/
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#define ALIASCMD (builtincmd + 3)
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#define BGCMD (builtincmd + 4)
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#define BREAKCMD (builtincmd + 5)
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#define CDCMD (builtincmd + 6)
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#define COMMANDCMD (builtincmd + 8)
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#define DOTCMD (builtincmd + 0)
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#define ECHOCMD (builtincmd + 10)
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#define EVALCMD (builtincmd + 11)
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#define EXECCMD (builtincmd + 12)
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#define EXITCMD (builtincmd + 13)
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#define EXPORTCMD (builtincmd + 14)
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#define FALSECMD (builtincmd + 15)
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#define FGCMD (builtincmd + 16)
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#define GETOPTSCMD (builtincmd + 17)
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#define HASHCMD (builtincmd + 18)
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#define JOBSCMD (builtincmd + 19)
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#define KILLCMD (builtincmd + 20)
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#define LOCALCMD (builtincmd + 21)
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#define PRINTFCMD (builtincmd + 22)
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#define PWDCMD (builtincmd + 23)
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#define READCMD (builtincmd + 24)
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#define RETURNCMD (builtincmd + 26)
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#define SETCMD (builtincmd + 27)
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#define SHIFTCMD (builtincmd + 28)
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#define TESTCMD (builtincmd + 2)
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#define TIMESCMD (builtincmd + 30)
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#define TRAPCMD (builtincmd + 31)
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#define TRUECMD (builtincmd + 1)
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#define TYPECMD (builtincmd + 33)
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#define ULIMITCMD (builtincmd + 34)
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#define UMASKCMD (builtincmd + 35)
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#define UNALIASCMD (builtincmd + 36)
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#define UNSETCMD (builtincmd + 37)
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#define WAITCMD (builtincmd + 38)
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#define ALIASCMD (kBuiltinCmds + 3)
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#define BGCMD (kBuiltinCmds + 4)
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#define BREAKCMD (kBuiltinCmds + 5)
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#define CDCMD (kBuiltinCmds + 6)
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#define COMMANDCMD (kBuiltinCmds + 8)
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#define DOTCMD (kBuiltinCmds + 0)
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#define ECHOCMD (kBuiltinCmds + 10)
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#define EVALCMD (kBuiltinCmds + 11)
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#define EXECCMD (kBuiltinCmds + 12)
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#define EXITCMD (kBuiltinCmds + 13)
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#define EXPORTCMD (kBuiltinCmds + 14)
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#define FALSECMD (kBuiltinCmds + 15)
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#define FGCMD (kBuiltinCmds + 16)
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#define GETOPTSCMD (kBuiltinCmds + 17)
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#define HASHCMD (kBuiltinCmds + 18)
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#define JOBSCMD (kBuiltinCmds + 19)
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#define KILLCMD (kBuiltinCmds + 20)
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#define LOCALCMD (kBuiltinCmds + 21)
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#define PRINTFCMD (kBuiltinCmds + 22)
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#define PWDCMD (kBuiltinCmds + 23)
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#define READCMD (kBuiltinCmds + 24)
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#define RETURNCMD (kBuiltinCmds + 26)
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#define SETCMD (kBuiltinCmds + 27)
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#define SHIFTCMD (kBuiltinCmds + 28)
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#define TESTCMD (kBuiltinCmds + 2)
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#define TIMESCMD (kBuiltinCmds + 30)
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#define TRAPCMD (kBuiltinCmds + 31)
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#define TRUECMD (kBuiltinCmds + 1)
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#define TYPECMD (kBuiltinCmds + 33)
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#define ULIMITCMD (kBuiltinCmds + 34)
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#define UMASKCMD (kBuiltinCmds + 35)
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#define UNALIASCMD (kBuiltinCmds + 36)
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#define UNSETCMD (kBuiltinCmds + 37)
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#define WAITCMD (kBuiltinCmds + 38)
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#define BUILTIN_SPECIAL 0x1
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#define BUILTIN_REGULAR 0x2
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@ -620,12 +620,12 @@
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#define octtobin(c) ((c) - '0')
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#define scopy(s1, s2) ((void)strcpy(s2, s1))
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#define TRACE(param)
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/* #define TRACE(param) \ */
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/* do { \ */
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/* printf("TRACE: "); \ */
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/* printf param; \ */
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/* } while (0) */
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/* #define TRACE(param) */
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#define TRACE(param) \
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do { \
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printf("TRACE: "); \
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printf param; \
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} while (0)
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#define TRACEV(param)
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#define digit_val(c) ((c) - '0')
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@ -1184,13 +1184,16 @@ static const char dolatstr[] = {CTLQUOTEMARK, CTLVAR, VSNORMAL, '@', '=', CTLQUO
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/* Some macros depend on the order, add new variables to the end. */
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static void changepath(const char *);
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static void getoptsreset(const char *);
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static struct Var varinit[] = {{0, VSTRFIXED | VTEXTFIXED, defifsvar, 0},
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{0, VSTRFIXED | VTEXTFIXED, defpathvar, changepath},
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{0, VSTRFIXED | VTEXTFIXED, "PS1=$ ", 0},
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{0, VSTRFIXED | VTEXTFIXED, "PS2=> ", 0},
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{0, VSTRFIXED | VTEXTFIXED, "PS4=+ ", 0},
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{0, VSTRFIXED | VTEXTFIXED, defoptindvar, getoptsreset},
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{0, VSTRFIXED | VTEXTFIXED, linenovar, 0}};
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static struct Var varinit[] = {
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{0, VSTRFIXED | VTEXTFIXED, defifsvar, 0},
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{0, VSTRFIXED | VTEXTFIXED, defpathvar, changepath},
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{0, VSTRFIXED | VTEXTFIXED, "PS1=$ ", 0},
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{0, VSTRFIXED | VTEXTFIXED, "PS2=> ", 0},
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{0, VSTRFIXED | VTEXTFIXED, "PS4=+ ", 0},
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{0, VSTRFIXED | VTEXTFIXED, defoptindvar, getoptsreset},
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{0, VSTRFIXED | VTEXTFIXED, linenovar, 0},
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};
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static const char kPrec[ARITH_BINOP_MAX - ARITH_BINOP_MIN] = {
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#define ARITH_PRECEDENCE(OP, PREC) [OP - ARITH_BINOP_MIN] = PREC
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@ -1308,7 +1311,8 @@ static const char sqsyntax[] = {
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CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD,
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CCTL, CCTL, CCTL, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD,
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CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD,
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CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CCTL, CWORD};
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CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CCTL, CWORD,
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};
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/* syntax table used when in arithmetic */
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static const char arisyntax[] = {
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@ -1331,7 +1335,8 @@ static const char arisyntax[] = {
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CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD,
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CWORD, CBACK, CWORD, CWORD, CWORD, CBQUOTE, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD,
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CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD,
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CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CENDVAR, CWORD, CWORD};
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CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CWORD, CENDVAR, CWORD, CWORD,
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};
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/* character classification table */
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static const char is_type[] /* clang-format off */ = {
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@ -1405,20 +1410,47 @@ static int unaliascmd();
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static int unsetcmd();
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static int waitcmd();
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static const struct builtincmd builtincmd[] = {
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{".", dotcmd, 3}, {":", truecmd, 3}, {"[", testcmd, 0},
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{"alias", aliascmd, 6}, {"bg", bgcmd, 2}, {"break", breakcmd, 3},
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{"cd", cdcmd, 2}, {"chdir", cdcmd, 0}, {"command", commandcmd, 2},
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{"continue", breakcmd, 3}, {"echo", echocmd, 0}, {"eval", NULL, 3},
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{"exec", execcmd, 3}, {"exit", exitcmd, 3}, {"export", exportcmd, 7},
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{"false", falsecmd, 2}, {"fg", fgcmd, 2}, {"getopts", getoptscmd, 2},
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{"hash", hashcmd, 2}, {"jobs", jobscmd, 2}, {"kill", killcmd, 2},
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{"local", localcmd, 7}, {"printf", printfcmd, 0}, {"pwd", pwdcmd, 2},
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{"read", readcmd, 2}, {"readonly", exportcmd, 7}, {"return", returncmd, 3},
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{"set", setcmd, 3}, {"shift", shiftcmd, 3}, {"test", testcmd, 0},
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{"times", timescmd, 3}, {"trap", trapcmd, 3}, {"true", truecmd, 2},
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{"type", typecmd, 2}, {"ulimit", ulimitcmd, 2}, {"umask", umaskcmd, 2},
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{"unalias", unaliascmd, 2}, {"unset", unsetcmd, 3}, {"wait", waitcmd, 2}};
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static const struct builtincmd kBuiltinCmds[] = {
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{".", dotcmd, 3}, //
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{":", truecmd, 3}, //
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{"[", testcmd, 0}, //
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{"alias", aliascmd, 6}, //
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{"bg", bgcmd, 2}, //
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{"break", breakcmd, 3}, //
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{"cd", cdcmd, 2}, //
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{"chdir", cdcmd, 0}, //
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{"command", commandcmd, 2}, //
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{"continue", breakcmd, 3}, //
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{"echo", echocmd, 0}, //
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{"eval", NULL, 3}, //
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{"exec", execcmd, 3}, //
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{"exit", exitcmd, 3}, //
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{"export", exportcmd, 7}, //
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{"false", falsecmd, 2}, //
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{"fg", fgcmd, 2}, //
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{"getopts", getoptscmd, 2}, //
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{"hash", hashcmd, 2}, //
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{"jobs", jobscmd, 2}, //
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{"kill", killcmd, 2}, //
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{"local", localcmd, 7}, //
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{"printf", printfcmd, 0}, //
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{"pwd", pwdcmd, 2}, //
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{"read", readcmd, 2}, //
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{"readonly", exportcmd, 7}, //
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{"return", returncmd, 3}, //
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{"set", setcmd, 3}, //
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{"shift", shiftcmd, 3}, //
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{"test", testcmd, 0}, //
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{"times", timescmd, 3}, //
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{"trap", trapcmd, 3}, //
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{"true", truecmd, 2}, //
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{"type", typecmd, 2}, //
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{"ulimit", ulimitcmd, 2}, //
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{"umask", umaskcmd, 2}, //
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{"unalias", unaliascmd, 2}, //
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{"unset", unsetcmd, 3}, //
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{"wait", waitcmd, 2}, //
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};
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enum token {
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EOI,
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@ -2115,7 +2147,7 @@ static int olderf(const char *, const char *);
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static int64_t openhere(union node *);
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static int openredirect(union node *);
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static int options(int);
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static int padvance_magic(const char **path, const char *name, int magic);
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static int padvance_magic(const char **, const char *, int);
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static int patmatch(char *, const char *);
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static int peektoken(void);
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static int pgetc(void);
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@ -2882,7 +2914,7 @@ step6:
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goto docd;
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err:
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sh_error("can't cd to %s", dest);
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/* NOTREACHED */
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unreachable;
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out:
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if (flags & CD_PRINT) out1fmt(snlfmt, curdir);
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return 0;
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@ -3446,7 +3478,7 @@ static void evalbackcmd(union node *n, struct backcmd *result) {
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}
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ifsfree();
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evaltreenr(n, EV_EXIT);
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/* NOTREACHED */
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unreachable;
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}
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close(pip[1]);
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result->fd = pip[0];
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@ -3629,7 +3661,7 @@ static int evalcommand(union node *cmd, int flags) {
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break;
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}
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shellexec(argv, path, cmdentry.u.index);
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/* NOTREACHED */
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unreachable;
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case CMDBUILTIN:
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if (evalbltin(cmdentry.u.cmd, argc, argv, flags) &&
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!(exception == EXERROR && spclbltin <= 0)) {
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@ -3742,9 +3774,11 @@ funcdone:
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*/
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static void prehash(union node *n) {
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struct cmdentry entry;
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if (n->type == NCMD && n->ncmd.args)
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if (goodname(n->ncmd.args->narg.text))
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if (n->type == NCMD && n->ncmd.args) {
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if (goodname(n->ncmd.args->narg.text)) {
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find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
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}
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}
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}
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/*───────────────────────────────────────────────────────────────────────────│─╗
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@ -4014,10 +4048,8 @@ static void readcmdfile(char *name) {
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* Search the table of builtin commands.
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*/
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static struct builtincmd *find_builtin(const char *name) {
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struct builtincmd *bp;
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bp = bsearch(&name, builtincmd, sizeof(builtincmd) / sizeof(builtincmd[0]), sizeof(builtincmd[0]),
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pstrcmp);
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return bp;
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return bsearch(&name, kBuiltinCmds, sizeof(kBuiltinCmds) / sizeof(kBuiltinCmds[0]),
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sizeof(kBuiltinCmds[0]), pstrcmp);
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}
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/*
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@ -4025,15 +4057,11 @@ static struct builtincmd *find_builtin(const char *name) {
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* change the shellexec routine as well.
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*/
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static void find_command(char *name, struct cmdentry *entry, int act, const char *path) {
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struct tblentry *cmdp;
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int idx;
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int prev;
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char *fullname;
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struct stat statb;
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int e;
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int updatetbl;
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struct tblentry *cmdp;
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struct builtincmd *bcmd;
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int len;
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int e, bit, idx, prev, updatetbl, len;
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/* If name contains a slash, don't use PATH or hash table */
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if (strchr(name, '/') != NULL) {
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entry->u.index = -1;
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@ -4050,7 +4078,6 @@ static void find_command(char *name, struct cmdentry *entry, int act, const char
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if (!updatetbl) act |= DO_ALTPATH;
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/* If name is in the table, check answer will be ok */
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if ((cmdp = cmdlookup(name, 0)) != NULL) {
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int bit;
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switch (cmdp->cmdtype) {
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default:
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case CMDNORMAL:
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@ -4067,9 +4094,10 @@ static void find_command(char *name, struct cmdentry *entry, int act, const char
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if (act & bit & DO_REGBLTIN) goto fail;
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updatetbl = 0;
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cmdp = NULL;
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} else if (cmdp->rehash == 0)
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} else if (cmdp->rehash == 0) {
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/* if not invalidated by cd, we're done */
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goto success;
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}
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}
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/* If %builtin not in path, check for builtin next */
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bcmd = find_builtin(name);
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|
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@ -4744,7 +4772,7 @@ static void expbackq(union node *cmd, int flag) {
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recordregion(startloc, dest - (char *)stackblock(), 0);
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}
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TRACE(("evalbackq: size=%d: \"%.*s\"\n", (dest - (char *)stackblock()) - startloc,
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(dest - (char *)stackblock()) - startloc, stackblock() + startloc));
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(dest - (char *)stackblock()) - startloc, (char *)stackblock() + startloc));
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out:
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argbackq = argbackq->next;
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}
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|
|
@ -4822,7 +4850,7 @@ static char *subevalvar(char *start, char *str, int strloc, int startloc, int va
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goto out;
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case VSQUESTION:
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varunset(start, str, startp, varflags);
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/* NOTREACHED */
|
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unreachable;
|
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}
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subtype -= VSTRIMRIGHT;
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rmesc = startp;
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|
|
@ -6450,7 +6478,7 @@ static void forkparent(struct job *jp, union node *n, int mode, int pid) {
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TRACE(("Fork failed, errno=%d", errno));
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if (jp) freejob(jp);
|
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sh_error("Cannot fork");
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/* NOTREACHED */
|
||||
unreachable;
|
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}
|
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TRACE(("In parent shell: child = %d\n", pid));
|
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if (!jp) return;
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|
|
@ -6480,10 +6508,11 @@ static int forkshell(struct job *jp, union node *n, int mode) {
|
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int pid;
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TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
|
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pid = fork();
|
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if (pid == 0)
|
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if (pid == 0) {
|
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forkchild(jp, n, mode);
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else
|
||||
} else {
|
||||
forkparent(jp, n, mode, pid);
|
||||
}
|
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return pid;
|
||||
}
|
||||
|
||||
|
|
@ -6498,7 +6527,7 @@ static struct job *vforkexec(union node *n, char **argv, const char *path, int i
|
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forkchild(jp, n, FORK_FG);
|
||||
sigclearmask();
|
||||
shellexec(argv, path, idx);
|
||||
/* NOTREACHED */
|
||||
unreachable;
|
||||
}
|
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vforked = 0;
|
||||
sigclearmask();
|
||||
|
|
@ -7355,7 +7384,7 @@ static void setoption(int flag, int val) {
|
|||
return;
|
||||
}
|
||||
sh_error("Illegal option -%c", flag);
|
||||
/* NOTREACHED */
|
||||
unreachable;
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -7799,7 +7828,7 @@ static union node *command(void) {
|
|||
switch (readtoken()) {
|
||||
default:
|
||||
synexpect(-1);
|
||||
/* NOTREACHED */
|
||||
unreachable;
|
||||
case TIF:
|
||||
n1 = (union node *)stalloc(sizeof(struct nif));
|
||||
n1->type = NIF;
|
||||
|
|
@ -9998,10 +10027,10 @@ static void initvar(void) {
|
|||
vp->next = *vpp;
|
||||
*vpp = vp;
|
||||
} while (++vp < end);
|
||||
/*
|
||||
* PS1 depends on uid
|
||||
*/
|
||||
if (!geteuid()) vps1.text = "PS1=# ";
|
||||
/* PS1 depends on uid */
|
||||
if (!geteuid()) {
|
||||
vps1.text = "PS1=# ";
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -10749,7 +10778,7 @@ static int exitcmd(int argc, char **argv) {
|
|||
exraise(EXEXIT);
|
||||
}
|
||||
|
||||
/*
|
||||
/**
|
||||
* Main routine. We initialize things, parse the arguments, execute
|
||||
* profiles if we're a login shell, and then call cmdloop to execute
|
||||
* commands. The setjmp call sets up the location to jump to when an
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue