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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

6
libc/calls/hefty/access.c
View File

@@ -17,10 +17,11 @@
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/dce.h"
#include "libc/calls/internal.h"
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/dce.h"
#include "libc/sysv/consts/at.h"
#include "libc/sysv/errfuns.h"
/**
* Checks if effective user can access path in particular ways.
@@ -31,6 +32,7 @@
* @asyncsignalsafe
*/
int access(const char *path, int mode) {
if (!path) return efault();
if (!IsWindows()) {
return faccessat$sysv(AT_FDCWD, path, mode, 0);
} else {

108
libc/calls/hefty/copyfile.c Normal file
View File

@@ -0,0 +1,108 @@
/*-*- 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/calls/hefty/copyfile.h"
#include "libc/calls/internal.h"
#include "libc/calls/struct/stat.h"
#include "libc/dce.h"
#include "libc/nt/createfile.h"
#include "libc/nt/enum/accessmask.h"
#include "libc/nt/enum/creationdisposition.h"
#include "libc/nt/files.h"
#include "libc/nt/runtime.h"
#include "libc/sysv/consts/at.h"
#include "libc/sysv/consts/madv.h"
#include "libc/sysv/consts/o.h"
#include "libc/time/time.h"
static textwindows int copyfile$nt(const char *src, const char *dst,
int flags) {
int64_t fhsrc, fhdst;
struct NtFileTime accessed, modified;
char16_t src16[PATH_MAX], dst16[PATH_MAX];
if (mkntpath(src, src16) == -1) return -1;
if (mkntpath(dst, dst16) == -1) return -1;
if (CopyFile(src16, dst16, !!(flags & COPYFILE_NOCLOBBER))) {
if (flags & COPYFILE_PRESERVE_TIMESTAMPS) {
fhsrc = CreateFile(src16, kNtFileReadAttributes, kNtFileShareRead, NULL,
kNtOpenExisting, kNtFileAttributeNormal, 0);
fhdst = CreateFile(dst16, kNtFileWriteAttributes, kNtFileShareRead, NULL,
kNtOpenExisting, kNtFileAttributeNormal, 0);
if (fhsrc != -1 && fhdst != -1) {
GetFileTime(fhsrc, NULL, &accessed, &modified);
SetFileTime(fhdst, NULL, &accessed, &modified);
}
CloseHandle(fhsrc);
CloseHandle(fhdst);
}
return 0;
} else {
return winerr();
}
}
static int copyfile$sysv(const char *src, const char *dst, int flags) {
struct stat st;
size_t remaining;
ssize_t transferred;
struct timespec amtime[2];
int64_t inoffset, outoffset;
int rc, srcfd, dstfd, oflags, omode;
rc = -1;
if ((srcfd = openat$sysv(AT_FDCWD, src, O_RDONLY, 0)) != -1) {
if (fstat$sysv(srcfd, &st) != -1) {
omode = st.st_mode & 0777;
oflags = O_WRONLY | O_CREAT;
if (flags & COPYFILE_NOCLOBBER) oflags |= O_EXCL;
if ((dstfd = openat$sysv(AT_FDCWD, dst, oflags, omode)) != -1) {
remaining = st.st_size;
ftruncate(dstfd, remaining);
inoffset = 0;
outoffset = 0;
while (remaining &&
(transferred = copy_file_range(
srcfd, &inoffset, dstfd, &outoffset, remaining, 0)) != -1) {
remaining -= transferred;
}
if (!remaining) {
rc = 0;
if (flags & COPYFILE_PRESERVE_TIMESTAMPS) {
amtime[0] = st.st_atim;
amtime[1] = st.st_mtim;
utimensat$sysv(dstfd, NULL, amtime, 0);
}
}
rc |= close$sysv(dstfd);
}
}
rc |= close$sysv(srcfd);
}
return rc;
}
/**
* Copies file.
*/
int copyfile(const char *src, const char *dst, int flags) {
if (!IsWindows()) {
return copyfile$sysv(src, dst, flags);
} else {
return copyfile$nt(src, dst, flags);
}
}

15
libc/calls/hefty/copyfile.h Normal file
View File

@@ -0,0 +1,15 @@
#ifndef COSMOPOLITAN_LIBC_CALLS_HEFTY_COPYFILE_H_
#define COSMOPOLITAN_LIBC_CALLS_HEFTY_COPYFILE_H_
#define COPYFILE_NOCLOBBER 1
#define COPYFILE_PRESERVE_OWNER 2
#define COPYFILE_PRESERVE_TIMESTAMPS 4
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
int copyfile(const char *, const char *, int) paramsnonnull();
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_CALLS_HEFTY_COPYFILE_H_ */

30
libc/calls/hefty/faccessat-nt.c Normal file
View File

@@ -0,0 +1,30 @@
/*-*- 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/calls/hefty/internal.h"
#include "libc/calls/internal.h"
#include "libc/sysv/consts/at.h"
#include "libc/sysv/errfuns.h"
int faccessat$nt(int dirfd, const char *path, int mode, uint32_t flags) {
char16_t path16[PATH_MAX];
if (dirfd != AT_FDCWD || flags) return einval();
if (mkntpath(path, path16) == -1) return -1;
return ntaccesscheck(path16, mode);
}

7
libc/calls/hefty/faccessat.c
View File

@@ -18,6 +18,7 @@
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/hefty/internal.h"
#include "libc/calls/internal.h"
#include "libc/dce.h"
#include "libc/sysv/consts/at.h"
@@ -33,12 +34,10 @@
* @asyncsignalsafe
*/
int faccessat(int dirfd, const char *path, int mode, uint32_t flags) {
if (!path) return efault();
if (!IsWindows()) {
return faccessat$sysv(dirfd, path, mode, flags);
} else {
char16_t path16[PATH_MAX];
if (dirfd != AT_FDCWD || flags) return einval();
if (mkntpath(path, path16) == -1) return -1;
return ntaccesscheck(path16, mode);
return faccessat$nt(dirfd, path, mode, flags);
}
}

11
libc/calls/hefty/hefty.mk
View File

@@ -36,17 +36,18 @@ LIBC_CALLS_HEFTY_A_CHECKS = \
LIBC_CALLS_HEFTY_A_DIRECTDEPS = \
LIBC_ALG \
LIBC_CALLS \
LIBC_CONV \
LIBC_FMT \
LIBC_MEM \
LIBC_STR \
LIBC_NEXGEN32E \
LIBC_RUNTIME \
LIBC_CALLS \
LIBC_STUBS \
LIBC_NT_KERNELBASE \
LIBC_RUNTIME \
LIBC_STR \
LIBC_STUBS \
LIBC_SYSV \
LIBC_SYSV_CALLS \
LIBC_SYSV
LIBC_TIME
LIBC_CALLS_HEFTY_A_DEPS := \
$(call uniq,$(foreach x,$(LIBC_CALLS_HEFTY_A_DIRECTDEPS),$($(x))))

1
libc/calls/hefty/internal.h
View File

@@ -3,6 +3,7 @@
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
int faccessat$nt(int, const char *, int, uint32_t) hidden;
int execve$nt(const char *, char *const[], char *const[]) hidden;
int spawnve$nt(unsigned, int[3], const char *, char *const[],
char *const[]) hidden;

48
libc/calls/hefty/mkntenvblock.c
View File

@@ -35,36 +35,32 @@
* @return freshly allocated lpEnvironment or NULL w/ errno
*/
textwindows char16_t *mkntenvblock(char *const envp[]) {
size_t block_i = 0;
size_t block_n = 0;
char16_t *block_p = NULL;
size_t i, j;
if (!(envp = sortenvp(envp))) goto error;
const char16_t kNul = u'\0';
for (i = 0; envp[i]; ++i) {
unsigned consumed;
for (j = 0;; j += consumed) {
wint_t wc;
char16_t cbuf[2];
consumed = abs(tpdecode(&envp[i][j], &wc));
if (CONCAT(&block_p, &block_i, &block_n, cbuf,
abs(pututf16(cbuf, ARRAYLEN(cbuf), wc, false))) == -1) {
goto error;
wint_t wc;
size_t i, j, bi, bn;
char16_t *bp, cbuf[2];
unsigned consumed, produced;
bi = 0;
bn = 8;
bp = NULL;
if ((envp = sortenvp(envp)) && (bp = calloc(bn, sizeof(char16_t)))) {
for (i = 0; envp[i]; ++i) {
for (j = 0;; j += consumed) {
consumed = abs(tpdecode(&envp[i][j], &wc));
produced = abs(pututf16(cbuf, ARRAYLEN(cbuf), wc, false));
if (CONCAT(&bp, &bi, &bn, cbuf, produced) == -1) goto error;
if (!wc) break;
}
if (!wc) break;
}
++bi;
if (bi > ENV_MAX) {
e2big();
goto error;
}
free(envp);
return bp;
}
if (APPEND(&block_p, &block_i, &block_n, &kNul) == -1) {
goto error;
}
if (block_i > ENV_MAX) {
e2big();
goto error;
}
free(envp);
return block_p;
error:
free(envp);
free(block_p);
free(bp);
return NULL;
}