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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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54
libc/runtime/runtime.h
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@ -7,6 +7,8 @@ COSMOPOLITAN_C_START_
│ cosmopolitan § runtime ─╬─│┼
╚────────────────────────────────────────────────────────────────────────────│*/
struct SymbolTable;
struct StackFrame {
struct StackFrame *next;
intptr_t addr;
@ -14,31 +16,31 @@ struct StackFrame {
typedef long jmp_buf[8] aligned(CACHELINE);
extern int g_argc; /* CRT */
extern char **g_argv; /* CRT */
extern char **environ; /* CRT */
extern unsigned long *g_auxv; /* CRT */
extern jmp_buf g_winmain; /* CRT */
extern char *program_invocation_name; /* RII */
extern char *program_invocation_short_name; /* RII */
extern uint64_t g_syscount; /* RII */
extern const uint64_t kStartTsc; /* RII */
extern const char kTmpPath[]; /* RII */
extern const char kNtSystemDirectory[]; /* RII */
extern const char kNtWindowsDirectory[]; /* RII */
extern unsigned char _base[] aligned(PAGESIZE); /* αpε */
extern char _ehead aligned(PAGESIZE); /* αpε */
extern char _ereal; /* αpε */
extern char __privileged_start; /* αpε */
extern char __test_start; /* αpε */
extern char __ro; /* αpε */
extern char _etext aligned(PAGESIZE); /* αpε */
extern char __piro_start; /* αpε */
extern char _edata aligned(PAGESIZE); /* αpε */
extern char __piro_end; /* αpε */
extern char _end aligned(PAGESIZE); /* αpε */
extern uint8_t __zip_start[]; /* αpε */
extern uint8_t __zip_end[]; /* αpε */
extern int g_argc; /* CRT */
extern char **g_argv; /* CRT */
extern char **environ; /* CRT */
extern unsigned long *g_auxv; /* CRT */
extern jmp_buf g_winmain; /* CRT */
extern char *program_invocation_name; /* RII */
extern char *program_invocation_short_name; /* RII */
extern uint64_t g_syscount; /* RII */
extern const uint64_t kStartTsc; /* RII */
extern const char kTmpPath[]; /* RII */
extern const char kNtSystemDirectory[]; /* RII */
extern const char kNtWindowsDirectory[]; /* RII */
extern unsigned char _base[] aligned(PAGESIZE); /* αpε */
extern unsigned char _ehead[] aligned(PAGESIZE); /* αpε */
extern unsigned char _etext[] aligned(PAGESIZE); /* αpε */
extern unsigned char _edata[] aligned(PAGESIZE); /* αpε */
extern unsigned char _end[] aligned(PAGESIZE); /* αpε */
extern unsigned char _ereal; /* αpε */
extern unsigned char __privileged_start; /* αpε */
extern unsigned char __test_start; /* αpε */
extern unsigned char __ro; /* αpε */
extern unsigned char *__relo_start[]; /* αpε */
extern unsigned char *__relo_end[]; /* αpε */
extern uint8_t __zip_start[]; /* αpε */
extern uint8_t __zip_end[]; /* αpε */
long missingno();
void mcount(void);
@ -70,6 +72,8 @@ void loadxmm(void *);
void peekall(void);
int issetugid(void);
void weakfree(void *) libcesque;
void __hook(void (*)(void), struct SymbolTable *);
bool isheap(void *);
/*───────────────────────────────────────────────────────────────────────────│─╗
│ cosmopolitan § runtime » optimizations ─╬─│┼