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cosmopolitan/tool/build/assimilate.c
Justine Tunney 5469202ea8
Get monorepo fully building on Windows again 
The mkdeps tool was failing, because it used a clever mmap() hack that's
no longer supported. I've also removed tinymalloc.inc from build tooling
because Windows doesn't like the way it uses overcommit memory. Sadly it
means our build tool binaries will be larger. It's less of an issue, now
that we are no longer putting build tool binaries in the git repository.
2024-09-12 05:07:21 -07:00

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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/calls/calls.h"
#include "libc/calls/struct/stat.h"
#include "libc/dce.h"
#include "libc/elf/def.h"
#include "libc/elf/struct/ehdr.h"
#include "libc/errno.h"
#include "libc/fmt/conv.h"
#include "libc/limits.h"
#include "libc/macho.h"
#include "libc/macros.h"
#include "libc/runtime/runtime.h"
#include "libc/serialize.h"
#include "libc/stdckdint.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/map.h"
#include "libc/sysv/consts/msync.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/consts/prot.h"
#include "third_party/getopt/getopt.internal.h"
#include "third_party/regex/regex.h"
#define VERSION \
"actually portable executable assimilate v1.6\n" \
"copyright 2023 justine alexandra roberts tunney\n"
#define USAGE \
" [-xapembfchv] [-o PATH] FILE...\n" \
" -h show help\n" \
" -v show version\n" \
" -f ignore soft errors\n" \
" -b don't remove freebsd from elf os/abi\n" \
" -c clobber input path w/o making backup\n" \
" -e convert to elf regardless of host os\n" \
" -m convert to macho regardless of host os\n" \
" -x convert to amd64 regardless of host cpu\n" \
" -a convert to arm64 regardless of host cpu\n" \
" -p convert to ppc64 regardless of host cpu\n" \
" -o PATH write modified binary to different file\n"
#define ARCH_NATIVE 0
#define ARCH_AMD64 1
#define ARCH_ARM64 2
#define ARCH_PPC64 3
#define FORMAT_NATIVE 0
#define FORMAT_ELF 1
#define FORMAT_MACHO 2
#define FORMAT_PE 3
static int g_arch;
static int g_format;
static bool g_force;
static bool g_clobber;
static bool g_freebsd;
static const char *prog;
static const char *path;
static const char *outpath;
static bool got_format_flag;
static char bakpath[PATH_MAX];
static wontreturn void Die(const char *thing, const char *reason) {
const char *native_explainer;
if (got_format_flag) {
native_explainer = "";
} else if (IsXnu()) {
native_explainer = " (the host os uses macho natively)";
} else if (IsLinux() || IsFreebsd() || IsNetbsd() || IsOpenbsd()) {
native_explainer = " (the host os uses elf natively)";
} else {
native_explainer = " (the host os uses pe natively)";
}
tinyprint(2, thing, ": ", reason, native_explainer, "\n", NULL);
exit(1);
}
static wontreturn void DieSys(const char *thing) {
perror(thing);
exit(1);
}
static int Atoi(const char *s) {
int x;
if ((x = atoi(s)) == INT_MAX) {
Die(path, "integer overflow parsing ape macho dd argument");
}
return x;
}
static void GetOpts(int argc, char *argv[]) {
int opt;
if (IsFreebsd()) {
g_freebsd = true;
}
while ((opt = getopt(argc, argv, "hvfemxapbco:")) != -1) {
switch (opt) {
case 'f':
g_force = true;
break;
case 'c':
g_clobber = true;
break;
case 'b':
g_freebsd = true;
break;
case 'o':
outpath = optarg;
break;
case 'e':
g_format = FORMAT_ELF;
got_format_flag = true;
break;
case 'm':
g_format = FORMAT_MACHO;
got_format_flag = true;
break;
case 'x':
g_arch = ARCH_AMD64;
break;
case 'a':
g_arch = ARCH_ARM64;
break;
case 'p':
g_arch = ARCH_PPC64;
break;
case 'v':
tinyprint(1, VERSION, NULL);
exit(0);
case 'h':
tinyprint(1, VERSION, "usage: ", prog, USAGE, NULL);
exit(0);
default:
tinyprint(2, VERSION, "usage: ", prog, USAGE, NULL);
exit(1);
}
}
if (optind == argc) {
Die(prog, "missing operand");
}
if (g_format == FORMAT_NATIVE) {
if (IsXnu()) {
g_format = FORMAT_MACHO;
} else if (IsLinux() || IsFreebsd() || IsNetbsd() || IsOpenbsd()) {
g_format = FORMAT_ELF;
} else {
g_format = FORMAT_PE;
}
}
if (g_arch == ARCH_NATIVE) {
#ifdef __aarch64__
g_arch = ARCH_ARM64;
#elif defined(__powerpc64__)
g_arch = ARCH_PPC64;
#else
g_arch = ARCH_AMD64;
#endif
}
if (g_format == FORMAT_PE && g_arch != ARCH_AMD64) {
Die(prog, "native non-x86 on windows not supported yet");
}
}
static int GetElfArch(void) {
switch (g_arch) {
case ARCH_AMD64:
return EM_NEXGEN32E;
case ARCH_ARM64:
return EM_AARCH64;
case ARCH_PPC64:
return EM_PPC64;
default:
unassert(false);
}
}
static void GetElfHeader(Elf64_Ehdr *ehdr, const char *image, size_t n) {
int c, i;
const char *p, *e;
for (p = image, e = p + MIN(n, 8192); p < e; ++p) {
TryAgain:
if (READ64LE(p) != READ64LE("printf '"))
continue;
for (i = 0, p += 8; p + 3 < e && (c = *p++) != '\'';) {
if (c == '\\') {
if ('0' <= *p && *p <= '7') {
c = *p++ - '0';
if ('0' <= *p && *p <= '7') {
c *= 8;
c += *p++ - '0';
if ('0' <= *p && *p <= '7') {
c *= 8;
c += *p++ - '0';
}
}
}
}
if (i < 64) {
((char *)ehdr)[i++] = c;
} else {
goto TryAgain;
}
}
if (i != sizeof(*ehdr) || //
READ32LE(ehdr->e_ident) != READ32LE("\177ELF") || //
ehdr->e_ident[EI_CLASS] == ELFCLASS32 || //
ehdr->e_machine != GetElfArch()) {
goto TryAgain;
}
return;
}
switch (g_arch) {
case ARCH_AMD64:
Die(path, "printf statement not found in first 8192 bytes of image "
"containing elf64 ehdr for amd64");
case ARCH_ARM64:
Die(path, "printf statement not found in first 8192 bytes of image "
"containing elf64 ehdr for arm64");
case ARCH_PPC64:
Die(path, "printf statement not found in first 8192 bytes of image "
"containing elf64 ehdr for ppc64");
default:
unassert(false);
}
}
static int GetMachoArch(void) {
switch (g_arch) {
case ARCH_AMD64:
return MAC_CPU_NEXGEN32E;
case ARCH_ARM64:
return MAC_CPU_ARM64;
case ARCH_PPC64:
return MAC_CPU_POWERPC64;
default:
unassert(false);
}
}
static void GetMachoPayload(const char *image, size_t imagesize,
int *out_offset, int *out_size) {
regex_t rx;
const char *script;
regmatch_t rm[1 + 13] = {0};
int rc, skip, count, bs, offset, size;
if ((script = memmem(image, MIN(imagesize, 4096), "'\n#'\"\n", 6))) {
script += 6;
} else if ((script = memmem(image, MIN(imagesize, 4096), "#'\"\n", 4))) {
script += 4;
} else {
Die(path, "ape shell script not found");
}
// the ape shell script has always historically used `dd` to
// assimilate binaries to the mach-o file format but we have
// formatted the arguments in a variety of different ways eg
//
// - `arg=" 9293"` is how we originally had ape do it
// - `arg=$(( 9293))` b/c busybox sh disliked quoted space
// - `arg=9293 ` is generated by modern apelink program
//
unassert(regcomp(&rx,
"bs=" // dd block size arg
"(['\"] *)?" // #1 optional quote w/ space
"(\\$\\(\\( *)?" // #2 optional math w/ space
"([[:digit:]]+)" // #3
"( *\\)\\))?" // #4 optional math w/ space
"( *['\"])?" // #5 optional quote w/ space
" +" //
"skip=" // dd skip arg
"(['\"] *)?" // #6 optional quote w/ space
"(\\$\\(\\( *)?" // #7 optional math w/ space
"([[:digit:]]+)" // #8
"( *\\)\\))?" // #9 optional math w/ space
"( *['\"])?" // #10 optional quote w/ space
" +" //
"count=" // dd count arg
"(['\"] *)?" // #11 optional quote w/ space
"(\\$\\(\\( *)?" // #12 optional math w/ space
"([[:digit:]]+)", // #13
REG_EXTENDED) == REG_OK);
int i = 0;
TryAgain:
rc = regexec(&rx, script + i, 1 + 13, rm, 0);
if (rc != REG_OK) {
unassert(rc == REG_NOMATCH);
switch (g_arch) {
case ARCH_AMD64:
Die(path, "ape macho dd command for amd64 not found");
case ARCH_ARM64:
Die(path, "ape macho dd command for arm64 not found; by convention ape "
"executables are run on apple silicon only as elf binaries, "
"which are loaded by the ape-m1.c ape loader program; thus "
"consider passing the -ae flags to assimilate to arm64 elf");
case ARCH_PPC64:
Die(path, "ape macho dd command for ppc64 not found");
default:
unassert(false);
}
}
i += rm[13].rm_eo;
bs = Atoi(script + rm[3].rm_so);
skip = Atoi(script + rm[8].rm_so);
count = Atoi(script + rm[13].rm_so);
if (ckd_mul(&offset, skip, bs)) {
Die(path, "integer overflow computing ape macho dd offset");
}
if (ckd_mul(&size, count, bs)) {
Die(path, "integer overflow computing ape macho dd size");
}
if (offset < 64) {
Die(path, "ape macho dd offset must be at least 64");
}
if (offset >= imagesize) {
Die(path, "ape macho dd offset points outside image");
}
if (size < 32) {
Die(path, "ape macho dd size must be at least 32");
}
if (size > imagesize - offset) {
Die(path, "ape macho dd size overlaps end of image");
exit(1);
}
if (READ32LE(image + offset) != 0xFEEDFACE + 1 ||
READ32LE(image + offset + 4) != GetMachoArch()) {
goto TryAgain;
}
*out_offset = offset;
*out_size = size;
regfree(&rx);
}
static ssize_t Write(int fd, const void *data, size_t size) {
ssize_t rc;
const char *p, *e;
for (p = data, e = p + size; p < e; p += (size_t)rc) {
if ((rc = write(fd, p, e - p)) == -1) {
return -1;
}
}
return size;
}
static ssize_t Pwrite(int fd, const void *data, size_t size, uint64_t offset) {
ssize_t rc;
const char *p, *e;
for (p = data, e = p + size; p < e; p += (size_t)rc, offset += (size_t)rc) {
if ((rc = pwrite(fd, p, e - p, offset)) == -1) {
return -1;
}
}
return size;
}
static int GetMode(int fd) {
struct stat st;
if (fstat(fd, &st))
DieSys(path);
return st.st_mode & 0777;
}
static void CopyFile(int infd, const char *map, size_t size, //
const void *hdr, size_t hdrsize) {
int outfd;
if (!outpath)
return;
if ((outfd = creat(outpath, GetMode(infd))) == -1)
DieSys(outpath);
if (hdrsize && Write(outfd, hdr, hdrsize) == -1)
DieSys(outpath);
if (Write(outfd, map + hdrsize, size - hdrsize) == -1)
DieSys(outpath);
if (close(outfd))
DieSys(outpath);
}
static void WriteOutput(int infd, const char *map, size_t size, //
const void *hdr, size_t hdrsize) {
int outfd, oflags, omode;
if (outpath) {
CopyFile(infd, map, size, hdr, hdrsize);
} else if (g_clobber) {
if (Pwrite(infd, hdr, hdrsize, 0) == -1)
DieSys(path);
} else {
omode = GetMode(infd);
oflags = O_WRONLY | O_CREAT | (g_force ? O_TRUNC : O_EXCL);
strlcat(bakpath, path, sizeof(bakpath));
if (strlcat(bakpath, ".bak", sizeof(bakpath)) >= sizeof(bakpath)) {
Die(path, "filename too long");
}
if ((outfd = open(bakpath, oflags, omode)) == -1)
DieSys(bakpath);
if (Write(outfd, map, size) == -1)
DieSys(bakpath);
if (close(outfd))
DieSys(bakpath);
if (Pwrite(infd, hdr, hdrsize, 0) == -1)
DieSys(path);
}
}
static void AssimilateElf(int infd, const char *map, size_t size) {
Elf64_Ehdr ehdr;
GetElfHeader(&ehdr, map, size);
if (!g_freebsd && ehdr.e_ident[EI_OSABI] == ELFOSABI_FREEBSD) {
// none of the kernels except freebsd care about the osabi. however
// gdb does whine about it when trying to debug ape elf programs on
// other platforms like linux. so when assimilating, it makes sense
// to fall back to the more generic system v os abi.
ehdr.e_ident[EI_OSABI] = ELFOSABI_SYSV;
}
WriteOutput(infd, map, size, &ehdr, sizeof(ehdr));
}
static void AssimilateMacho(int infd, const char *map, size_t size) {
int macho_offset, macho_size;
GetMachoPayload(map, size, &macho_offset, &macho_size);
WriteOutput(infd, map, size, map + macho_offset, macho_size);
}
static void Assimilate(void) {
int fd;
char *p;
int oflags;
ssize_t size;
oflags = outpath ? O_RDONLY : O_RDWR;
if ((fd = open(path, oflags)) == -1)
DieSys(path);
if ((size = lseek(fd, 0, SEEK_END)) == -1)
DieSys(path);
if (size < 64)
Die(path, "ape executables must be at least 64 bytes");
p = mmap(0, size, PROT_READ, MAP_PRIVATE, fd, 0);
if (p == MAP_FAILED)
DieSys(path);
if (READ32LE(p) == READ32LE("\177ELF")) {
Elf64_Ehdr *ehdr;
switch (g_format) {
case FORMAT_ELF:
ehdr = (Elf64_Ehdr *)p;
if (ehdr->e_ident[EI_CLASS] == ELFCLASS32) {
Die(path, "32-bit elf not supported");
}
switch (g_arch) {
case ARCH_AMD64:
switch (ehdr->e_machine) {
case EM_NEXGEN32E:
if (g_force) {
CopyFile(fd, p, size, 0, 0);
exit(0);
} else {
Die(path, "already an elf amd64 executable");
}
case EM_AARCH64:
Die(path, "can't assimilate elf arm64 to elf amd64");
case EM_PPC64:
Die(path, "can't assimilate elf ppc64 to elf amd64");
default:
Die(path, "elf has unsupported architecture");
}
case ARCH_ARM64:
switch (ehdr->e_machine) {
case EM_AARCH64:
if (g_force) {
CopyFile(fd, p, size, 0, 0);
exit(0);
} else {
Die(path, "already an elf arm64 executable");
}
case EM_NEXGEN32E:
Die(path, "can't assimilate elf amd64 to elf arm64");
case EM_PPC64:
Die(path, "can't assimilate elf ppc64 to elf arm64");
default:
Die(path, "elf has unsupported architecture");
}
case ARCH_PPC64:
switch (ehdr->e_machine) {
case EM_PPC64:
if (g_force) {
CopyFile(fd, p, size, 0, 0);
exit(0);
} else {
Die(path, "already an elf ppc64 executable");
}
case EM_NEXGEN32E:
Die(path, "can't assimilate elf amd64 to elf ppc64");
case EM_AARCH64:
Die(path, "can't assimilate elf arm64 to elf ppc64");
default:
Die(path, "elf has unsupported architecture");
}
default:
unassert(false);
}
case FORMAT_MACHO:
Die(path, "can't assimilate elf to macho");
case FORMAT_PE:
Die(path, "can't assimilate elf to pe (try elf2pe)");
default:
unassert(false);
}
}
if (READ32LE(p) == 0xFEEDFACE + 1) {
struct MachoHeader *macho;
switch (g_format) {
case FORMAT_MACHO:
macho = (struct MachoHeader *)p;
switch (g_arch) {
case ARCH_AMD64:
switch (macho->arch) {
case MAC_CPU_NEXGEN32E:
if (g_force) {
CopyFile(fd, p, size, 0, 0);
exit(0);
} else {
Die(path, "already a macho amd64 executable");
}
case MAC_CPU_ARM64:
Die(path, "can't assimilate macho arm64 to macho amd64");
case MAC_CPU_POWERPC64:
Die(path, "can't assimilate macho ppc64 to macho amd64");
default:
Die(path, "macho has unsupported architecture");
}
case ARCH_ARM64:
switch (macho->arch) {
case MAC_CPU_ARM64:
if (g_force) {
CopyFile(fd, p, size, 0, 0);
exit(0);
} else {
Die(path, "already a macho arm64 executable");
}
case MAC_CPU_NEXGEN32E:
Die(path, "can't assimilate macho amd64 to macho arm64");
case MAC_CPU_POWERPC64:
Die(path, "can't assimilate macho ppc64 to macho arm64");
default:
Die(path, "macho has unsupported architecture");
}
case ARCH_PPC64:
switch (macho->arch) {
case MAC_CPU_POWERPC64:
if (g_force) {
CopyFile(fd, p, size, 0, 0);
exit(0);
} else {
Die(path, "already a macho ppc64 executable");
}
case MAC_CPU_NEXGEN32E:
Die(path, "can't assimilate macho amd64 to macho ppc64");
case MAC_CPU_ARM64:
Die(path, "can't assimilate macho arm64 to macho ppc64");
default:
Die(path, "macho has unsupported architecture");
}
default:
unassert(false);
}
case FORMAT_ELF:
Die(path, "can't assimilate macho to elf");
case FORMAT_PE:
Die(path, "can't assimilate macho to pe");
default:
unassert(false);
}
}
if (READ64LE(p) != READ64LE("MZqFpD='") && //
READ64LE(p) != READ64LE("jartsr='") && //
READ64LE(p) != READ64LE("APEDBG='")) {
Die(path, "not an actually portable executable");
}
if (g_format == FORMAT_PE) {
if (READ16LE(p) == READ16LE("MZ")) {
if (g_force) {
CopyFile(fd, p, size, 0, 0);
exit(0);
} else {
Die(path, "this ape file is already a pe file");
}
} else {
Die(path, "this ape file was built without pe support");
}
}
if (g_format == FORMAT_ELF) {
AssimilateElf(fd, p, size);
} else if (g_format == FORMAT_MACHO) {
AssimilateMacho(fd, p, size);
}
if (munmap(p, size))
DieSys(path);
if (close(fd))
DieSys(path);
}
int main(int argc, char *argv[]) {
prog = program_invocation_short_name;
GetOpts(argc, argv);
for (int i = optind; i < argc; ++i) {
path = argv[i];
Assimilate();
}
}
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