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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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41
libc/log/backtrace2.c
View file

@ -19,13 +19,14 @@
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/alg/alg.h"
#include "libc/alg/bisectcarleft.h"
#include "libc/bits/bits.h"
#include "libc/bits/safemacros.h"
#include "libc/bits/weaken.h"
#include "libc/calls/calls.h"
#include "libc/calls/hefty/spawn.h"
#include "libc/conv/conv.h"
#include "libc/dce.h"
#include "libc/fmt/fmt.h"
#include "libc/log/log.h"
#include "libc/nexgen32e/gc.h"
#include "libc/runtime/runtime.h"
#include "libc/runtime/symbols.h"
@ -36,7 +37,7 @@
#define kBacktraceMaxFrames 128
#define kBacktraceBufSize ((kBacktraceMaxFrames - 1) * (16 + 1))
static char *formataddress(FILE *f, const struct SymbolTable *st, intptr_t addr,
static char *FormatAddress(FILE *f, const struct SymbolTable *st, intptr_t addr,
char *out, unsigned size, bool symbolic) {
int64_t addend;
const char *name;
@ -54,7 +55,7 @@ static char *formataddress(FILE *f, const struct SymbolTable *st, intptr_t addr,
return out;
}
static int printbacktraceusingsymbols(FILE *f, const struct StackFrame *bp,
static int PrintBacktraceUsingSymbols(FILE *f, const struct StackFrame *bp,
char buf[hasatleast kBacktraceBufSize]) {
size_t gi;
intptr_t addr;
@ -62,17 +63,17 @@ static int printbacktraceusingsymbols(FILE *f, const struct StackFrame *bp,
struct SymbolTable *symbols;
const struct StackFrame *frame;
if ((symbols = getsymboltable())) {
garbage = weaken(__garbage);
garbage = weaken(g_garbage);
gi = garbage ? garbage->i : 0;
for (frame = bp; frame; frame = frame->next) {
addr = frame->addr;
if (addr == weakaddr("__gc")) {
if (addr == weakaddr("CollectGarbage")) {
do {
--gi;
} while ((addr = garbage->p[gi].ret) == weakaddr("__gc"));
} while ((addr = garbage->p[gi].ret) == weakaddr("CollectGarbage"));
}
fprintf(f, "%p %p %s\n", frame, addr,
formataddress(f, symbols, addr, buf, kBacktraceBufSize, true));
FormatAddress(f, symbols, addr, buf, kBacktraceBufSize, true));
}
return 0;
} else {
@ -80,7 +81,7 @@ static int printbacktraceusingsymbols(FILE *f, const struct StackFrame *bp,
}
}
static int printbacktraceusingaddr2line(
static int PrintBacktraceUsingAddr2line(
FILE *f, const struct StackFrame *bp,
char buf[hasatleast kBacktraceBufSize],
char *argv[hasatleast kBacktraceMaxFrames]) {
@ -90,10 +91,8 @@ static int printbacktraceusingaddr2line(
int rc, pid, tubes[3];
struct Garbages *garbage;
const struct StackFrame *frame;
const char *addr2line, *debugbin, *p1, *p2, *p3;
if (!(debugbin = finddebugbinary()) ||
!(addr2line = emptytonull(firstnonnull(
getenv("ADDR2LINE"), firstnonnull(commandv("addr2line"), ""))))) {
const char *debugbin, *p1, *p2, *p3, *addr2line;
if (!(debugbin = finddebugbinary()) || !(addr2line = GetAddr2linePath())) {
return -1;
}
i = 0;
@ -102,14 +101,14 @@ static int printbacktraceusingaddr2line(
argv[i++] = "-a"; /* filter out w/ shell script wrapper for old versions */
argv[i++] = "-pCife";
argv[i++] = debugbin;
garbage = weaken(__garbage);
garbage = weaken(g_garbage);
gi = garbage ? garbage->i : 0;
for (frame = bp; frame && i < kBacktraceMaxFrames - 1; frame = frame->next) {
addr = frame->addr;
if (addr == weakaddr("__gc")) {
if (addr == weakaddr("CollectGarbage")) {
do {
--gi;
} while ((addr = garbage->p[gi].ret) == weakaddr("__gc"));
} while ((addr = garbage->p[gi].ret) == weakaddr("CollectGarbage"));
}
argv[i++] = &buf[j];
j += snprintf(&buf[j], 17, "%#x", addr - 1) + 1;
@ -118,7 +117,9 @@ static int printbacktraceusingaddr2line(
tubes[0] = STDIN_FILENO;
tubes[1] = -1;
tubes[2] = STDERR_FILENO;
if ((pid = spawnve(0, tubes, addr2line, argv, environ)) == -1) return -1;
if ((pid = spawnve(0, tubes, addr2line, argv, environ)) == -1) {
return -1;
}
while ((got = read(tubes[1], buf, kBacktraceBufSize)) > 0) {
for (p1 = buf; got;) {
/*
@ -147,15 +148,15 @@ static int printbacktraceusingaddr2line(
return 0;
}
static noinline int printbacktrace(FILE *f, const struct StackFrame *bp,
static noinline int PrintBacktrace(FILE *f, const struct StackFrame *bp,
char *argv[hasatleast kBacktraceMaxFrames],
char buf[hasatleast kBacktraceBufSize]) {
if (!IsTiny()) {
if (printbacktraceusingaddr2line(f, bp, buf, argv) != -1) {
if (PrintBacktraceUsingAddr2line(f, bp, buf, argv) != -1) {
return 0;
}
}
return printbacktraceusingsymbols(f, bp, buf);
return PrintBacktraceUsingSymbols(f, bp, buf);
}
void showbacktrace(FILE *f, const struct StackFrame *bp) {
@ -164,7 +165,7 @@ void showbacktrace(FILE *f, const struct StackFrame *bp) {
char buf[kBacktraceBufSize];
if (!noreentry) {
noreentry = true;
printbacktrace(f, bp, argv, buf);
PrintBacktrace(f, bp, argv, buf);
noreentry = 0;
}
}