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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
Download patch file Download diff file Expand all files Collapse all files

2
libc/testlib/almostequallongdouble.c
View file

@ -20,7 +20,7 @@
#include "libc/math.h"
#include "libc/testlib/testlib.h"
#define EPSILON 0.0000000000001L
#define EPSILON 0.00000001L
testonly bool testlib_almostequallongdouble(long double x, long double y) {
/* TODO(jart): This algorithm has to be binary. */

27
libc/testlib/bench.h
View file

@ -1,6 +1,5 @@
#ifndef COSMOPOLITAN_LIBC_BENCH_H_
#define COSMOPOLITAN_LIBC_BENCH_H_
#include "libc/bits/safemacros.h"
#include "libc/nexgen32e/bench.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
@ -9,19 +8,19 @@ COSMOPOLITAN_C_START_
* @fileoverview Microbenchmarking tools.
*/
#define BENCHLOOP(START, STOP, N, INIT, EXPR) \
({ \
int Iter, Count; \
long double Average, Sample, Time1, Time2; \
for (Average = 1.0, Iter = 1, Count = (N); Iter < Count; ++Iter) { \
INIT; \
Time1 = START(); \
EXPR; \
Time2 = STOP(); \
Sample = Time2 - Time1; \
Average += (Sample - Average) / Iter; \
} \
Average; \
#define BENCHLOOP(START, STOP, N, INIT, EXPR) \
({ \
unsigned long Iter, Count; \
double Average, Sample, Time1, Time2; \
for (Average = 1, Iter = 1, Count = (N); Iter < Count; ++Iter) { \
INIT; \
Time1 = START(); \
EXPR; \
Time2 = STOP(); \
Sample = Time2 - Time1; \
Average += 1. / Iter * (Sample - Average); \
} \
Average; \
})
COSMOPOLITAN_C_END_

31
libc/testlib/clearxmmregisters.c Normal file
View file

@ -0,0 +1,31 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/testlib/testlib.h"
void testlib_clearxmmregisters(void) {
asm("pxor\t%xmm0,%xmm0\n\t"
"pxor\t%xmm1,%xmm1\n\t"
"pxor\t%xmm2,%xmm2\n\t"
"pxor\t%xmm3,%xmm3\n\t"
"pxor\t%xmm4,%xmm4\n\t"
"pxor\t%xmm5,%xmm5\n\t"
"pxor\t%xmm6,%xmm6\n\t"
"pxor\t%xmm7,%xmm7");
}

5
libc/testlib/ezbenchreport.c
View file

@ -24,11 +24,12 @@
STATIC_YOINK("ntoa");
STATIC_YOINK("stoa");
STATIC_YOINK("strnwidth");
void __testlib_ezbenchreport(const char *form, uint64_t c1, uint64_t c2) {
uint64_t ns1, ns2;
ns1 = lrintl(converttickstonanos(c1));
ns2 = lrintl(converttickstonanos(c2));
ns1 = rintl(converttickstonanos(c1));
ns2 = rintl(converttickstonanos(c2));
(fprintf)(stderr,
VEIL("r", "%-30s l: %,10lu𝑐 %,10lu𝑛𝑠 m: %,10lu𝑐 %,10lu𝑛𝑠\n"),
form, c1, ns1, c2, ns2);

4
libc/testlib/fixturerunner.c
View file

@ -40,9 +40,9 @@ testonly void testlib_runfixtures(testfn_t *test_start, testfn_t *test_end,
for (i = 0; i < count && !g_testlib_failed; ++i) {
snprintf(g_fixturename, sizeof(g_fixturename), "%s_%s",
fixture_start[i].group, fixture_start[i].name);
__piro(PROT_READ | PROT_WRITE);
_piro(PROT_READ | PROT_WRITE);
fixture_start[i].fn();
__piro(PROT_READ);
_piro(PROT_READ);
testlib_runtestcases(test_start, test_end, NULL);
}
}

2
libc/testlib/showerror.c
View file

@ -42,7 +42,7 @@ testonly void testlib_showerror(const char *file, int line, const char *func,
"\t%s%s\n"
"\t%s%s\n",
RED2, "error", UNBOLD, BLUE1, file, line, RESET, method, "in", func,
g_fixturename, code, "want", v1, symbol, " got", v2, SUBTLE,
g_fixturename, code, "need", v1, symbol, " got", v2, SUBTLE,
strerror(errno), program_invocation_name, RESET);
free_s(&v1);
free_s(&v2);

2
libc/testlib/showerror_.c
View file

@ -60,7 +60,7 @@ testonly void testlib_showerror_(int line, const char *wantcode,
", %s)\n"
"\t\t%s %s %s\n"
"\t\t%s %s\n",
gotcode, "want", FREED_want, testlib_showerror_symbol, " got",
gotcode, "need", FREED_want, testlib_showerror_symbol, " got",
FREED_got);
} else {
fprintf(stderr,

13
libc/testlib/testlib.h
View file

@ -1,6 +1,6 @@
#ifndef COSMOPOLITAN_LIBC_TESTLIB_H_
#define COSMOPOLITAN_LIBC_TESTLIB_H_
#include "libc/bits/bits.h"
#include "libc/bits/weaken.h"
#include "libc/runtime/gc.h"
#include "libc/testlib/ugly.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
@ -15,7 +15,7 @@ COSMOPOLITAN_C_START_
* Test cases are guaranteed by the linker to be run in order, sorted by
* the (SUITE, NAME) tuple passed here.
*/
#define TEST(SUITE, NAME) __TEST_PROTOTYPE(SUITE, NAME, __TEST_ARRAY)
#define TEST(SUITE, NAME) __TEST_PROTOTYPE(SUITE, NAME, __TEST_ARRAY, )
/**
* Declares function that globally modifies program state.
@ -48,7 +48,7 @@ COSMOPOLITAN_C_START_
*/
#define BENCH(SUITE, NAME) \
STATIC_YOINK("__bench_start"); \
__TEST_PROTOTYPE(SUITE, NAME, __BENCH_ARRAY)
__TEST_PROTOTYPE(SUITE, NAME, __BENCH_ARRAY, optimizespeed)
#define ASSERT_GE(C, X) _TEST2("ASSERT_GE", C, >=, (X), #C, " ≥ ", #X, 1)
#define ASSERT_GT(C, X) _TEST2("ASSERT_GT", C, >, (X), #C, " > ", #X, 1)
@ -82,9 +82,11 @@ COSMOPOLITAN_C_START_
#define ASSERT_EQ(WANT, GOT, ...) \
__TEST_EQ(assert, __FILE__, __LINE__, __FUNCTION__, #WANT, #GOT, WANT, GOT, \
__VA_ARGS__)
#define EXPECT_EQ(WANT, GOT, ...) \
__TEST_EQ(expect, __FILE__, __LINE__, __FUNCTION__, #WANT, #GOT, WANT, GOT, \
__VA_ARGS__)
#define __TEST_EQ(KIND, FILE, LINE, FUNC, WANTCODE, GOTCODE, WANT, GOT, ...) \
({ \
autotype(GOT) Got = _I(GOT); \
@ -272,6 +274,7 @@ void *tunbing(const char16_t *)
void *tunbinga(size_t, const char16_t *)
paramsnonnull() returnsnonnull returnspointerwithnoaliases nodiscard
attributeallocalign((1));
void testlib_clearxmmregisters(void);
#define tgc(TMEM) \
({ \
@ -533,8 +536,8 @@ forceinline void assertStartsWith(FILIFU_ARGS size_t cw, const char *prefix,
if (testlib_startswith(cw, s, prefix)) return;
if (g_testlib_shoulddebugbreak) DebugBreak();
testlib_showerror(file, line, func, "assertStartsWith", "≠", gotcode,
testlib_formatstr(1, s, -1),
testlib_formatstr(1, prefix, -1));
testlib_formatstr(1, prefix, -1),
testlib_formatstr(1, s, -1));
testlib_onfail2(isfatal);
}

1
libc/testlib/testlib.mk
View file

@ -43,6 +43,7 @@ LIBC_TESTLIB_A_SRCS_C = \
libc/testlib/almostequallongdouble.c \
libc/testlib/hexequals.c \
libc/testlib/binequals.c \
libc/testlib/clearxmmregisters.c \
libc/testlib/formatbool.c \
libc/testlib/formatrange.c \
libc/testlib/globals.c \

1
libc/testlib/testmain.c
View file

@ -74,6 +74,7 @@ testonly int main(int argc, char *argv[]) {
showcrashreports();
g_testlib_shoulddebugbreak = IsDebuggerPresent(false);
getpid$sysv(); /* make strace easier to read */
testlib_clearxmmregisters();
testlib_runalltests();
if (!g_testlib_failed && runbenchmarks_ && weaken(testlib_runallbenchmarks)) {
weaken(testlib_runallbenchmarks)();

2
libc/testlib/testmem.c
View file

@ -94,7 +94,7 @@ static void testmem_fini(void) {
}
}
static void testmem_init(void) {
static textstartup void testmem_init(void) {
atexit(testmem_fini);
g_testmem.p = g_testmem_scratch[0];
g_testmem.n = ARRAYLEN(g_testmem_scratch[0]);

3
libc/testlib/testrunner.c
View file

@ -17,8 +17,8 @@
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/bits.h"
#include "libc/bits/safemacros.h"
#include "libc/bits/weaken.h"
#include "libc/calls/internal.h"
#include "libc/errno.h"
#include "libc/nt/process.h"
@ -70,6 +70,7 @@ testonly void testlib_runtestcases(testfn_t *start, testfn_t *end,
SetLastError(0);
getpid$sysv();
if (warmup) warmup();
testlib_clearxmmregisters();
(*fn)();
getpid$sysv();
if (weaken(TearDown)) weaken(TearDown)();

4
libc/testlib/ugly.h
View file

@ -14,10 +14,10 @@
#define __BENCH_ARRAY(S) \
_Section(".piro.relo.sort.bench.2." #S ",\"aw\",@init_array #")
#define __TEST_PROTOTYPE(S, N, A) \
#define __TEST_PROTOTYPE(S, N, A, K) \
testonly void S##_##N(void); \
alignas(8) const void *const S##_##N##_ptr[] A(S) = {S##_##N}; \
testonly void S##_##N(void)
testonly K void S##_##N(void)
#define __TEST_SECTION(NAME, CONTENT) \
".section " NAME "\n" CONTENT "\n\t.previous\n"