mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-07-03 09:48:29 +00:00
Make minor improvements
- Work towards simplifying ape.S startup process - Rewrote ar because it took minutes to build cosmopolitan.a
This commit is contained in:
Justine Tunney
parent
95bc650be8
commit
aea89fe832
70 changed files with 1037 additions and 456 deletions
146
tool/decode/ar.c
Normal file
146
tool/decode/ar.c
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@ -0,0 +1,146 @@
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/bits.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/stat.h"
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#include "libc/conv/conv.h"
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#include "libc/log/check.h"
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#include "libc/log/log.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/x/x.h"
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#define AR_MAGIC1 "!<arch>\n"
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#define AR_MAGIC2 "`\n"
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/**
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* ar rU doge.a NOTICE # create archive and use non-deterministic stuff
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* o//tool/decode/ar.com doge.a
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*/
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static int fd;
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static uint8_t *data;
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static long size;
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static const char *path;
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static struct stat st;
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static void PrintString(uint8_t *p, long n, const char *name) {
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char *s;
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s = xmalloc(n + 1);
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s[n] = '\0';
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memcpy(s, p, n);
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printf("\t.ascii\t%`'.*s\t\t\t# %s\n", n, s, name);
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free(s);
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}
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static void Open(void) {
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if ((fd = open(path, O_RDONLY)) == -1) {
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fprintf(stderr, "error: open() failed: %s\n", path);
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exit(1);
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}
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CHECK_NE(-1, fstat(fd, &st));
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if (!(size = st.st_size)) exit(0);
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CHECK_NE(MAP_FAILED,
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(data = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0)));
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LOGIFNEG1(close(fd));
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}
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static void Close(void) {
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LOGIFNEG1(munmap(data, size));
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}
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static void Check(void) {
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if (size < 8 + 60 + 4 ||
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(memcmp(data, AR_MAGIC1, strlen(AR_MAGIC1)) != 0 ||
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memcmp(data + 66, AR_MAGIC2, strlen(AR_MAGIC2)) != 0)) {
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fprintf(stderr, "error: not a unix archive: %s\n", path);
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exit(1);
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}
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}
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static void PrintTable(void) {
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}
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static void PrintHeader(uint8_t *p) {
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PrintString(p + 0, 16, "file identifier [ascii]");
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PrintString(p + 16, 12, "file modification timestamp [decimal]");
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PrintString(p + 28, 6, "owner id [decimal]");
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PrintString(p + 34, 6, "group id [decimal]");
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PrintString(p + 40, 8, "file mode [octal] (type and permission)");
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PrintString(p + 48, 10, "file size in bytes [decimal]");
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PrintString(p + 58, 2, "ending characters");
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}
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static void Print(void) {
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int arsize;
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uint8_t *b, *p;
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uint64_t offset;
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uint32_t i, n, o, table, entries, symbols, symbolslen;
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arsize = atoi((char *)(data + 8 + 48));
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CHECK_LE(4, arsize);
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CHECK_LE(8 + 60 + arsize, size);
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entries = read32be(data + 8 + 60);
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CHECK_LE(4 + entries * 4 + 1, arsize);
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printf("\t# %'s\n", path);
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PrintString(data, 8, "file signature");
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PrintHeader(data + 8);
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printf("\n");
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printf("\t.long\t%u\t\t\t# %s\n", entries, "symbol table entries");
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table = 8 + 60 + 4;
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for (i = 0; i < entries; ++i) {
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printf("\t.long\t%#x\t\t\t\t# %u\n", read32be(data + table + i * 4), i);
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}
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symbols = table + entries * 4;
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symbolslen = arsize - (4 + entries * 4);
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for (i = o = 0; o < symbolslen; ++i, o += n + 1) {
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b = data + symbols + o;
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CHECK_NOTNULL((p = memchr(b, '\0', symbolslen - (symbols + o))));
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n = p - b;
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printf("\t.asciz\t%#`'.*s\t\t\t# %u\n", n, b, i);
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}
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offset = 8 + 60 + arsize;
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while (offset < size) {
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offset += offset & 1;
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CHECK_LE(offset + 60, size);
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CHECK_EQ(0, memcmp(data + offset + 58, AR_MAGIC2, strlen(AR_MAGIC2)));
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arsize = atoi((char *)(data + offset + 48));
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CHECK_LE(offset + 60 + arsize, size);
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printf("\n");
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PrintHeader(data + offset);
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offset += 60 + arsize;
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}
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}
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int main(int argc, char *argv[]) {
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if (argc < 2) return 1;
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path = argv[1];
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Open();
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Check();
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Print();
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Close();
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return 0;
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}
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@ -134,8 +134,8 @@ static void printelfsectionheader(int i, char *shstrtab) {
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printf(".Lsh%d:", i);
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show(".long", format(b1, "%d", shdr->sh_name),
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format(b2,
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"%`'s == getelfstring(elf, st->st_size, shstrtab, shdr->sh_name)",
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getelfstring(elf, st->st_size, shstrtab, shdr->sh_name)));
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"%`'s == GetElfString(elf, st->st_size, shstrtab, shdr->sh_name)",
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GetElfString(elf, st->st_size, shstrtab, shdr->sh_name)));
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show(".long",
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firstnonnull(findnamebyid(kElfSectionTypeNames, shdr->sh_type),
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format(b1, "%d", shdr->sh_type)),
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@ -167,7 +167,7 @@ static void printelfsectionheaders(void) {
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->sh_offset);
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for (i = 0; i < elf->e_shnum; ++i) {
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Elf64_Shdr *shdr = getelfsectionheaderaddress(elf, st->st_size, i);
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const char *str = getelfstring(elf, st->st_size, shstrtab, shdr->sh_name);
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const char *str = GetElfString(elf, st->st_size, shstrtab, shdr->sh_name);
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show(".asciz", format(b1, "%`'s", str), NULL);
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}
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}
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@ -199,14 +199,14 @@ static void printelfsymbolother(Elf64_Sym *sym) {
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static void printelfsymbol(Elf64_Sym *sym, char *strtab, char *shstrtab) {
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show(".long", format(b1, "%d", sym->st_name),
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format(b2, "%`'s (sym->st_name)",
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getelfstring(elf, st->st_size, strtab, sym->st_name)));
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GetElfString(elf, st->st_size, strtab, sym->st_name)));
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printelfsymbolinfo(sym);
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printelfsymbolother(sym);
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show(".short", format(b1, "%d", sym->st_shndx),
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format(b2, "%s sym->st_shndx",
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sym->st_shndx < 0xff00
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? format(b1, "%`'s",
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getelfstring(elf, st->st_size, shstrtab,
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GetElfString(elf, st->st_size, shstrtab,
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getelfsectionheaderaddress(
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elf, st->st_size, sym->st_shndx)
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->sh_name))
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@ -217,8 +217,8 @@ static void printelfsymbol(Elf64_Sym *sym, char *strtab, char *shstrtab) {
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static void printelfsymboltable(void) {
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size_t i, symcount = 0;
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Elf64_Sym *symtab = getelfsymboltable(elf, st->st_size, &symcount);
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char *strtab = getelfstringtable(elf, st->st_size);
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Elf64_Sym *symtab = GetElfSymbolTable(elf, st->st_size, &symcount);
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char *strtab = GetElfStringTable(elf, st->st_size);
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char *shstrtab = getelfsectionnamestringtable(elf, st->st_size);
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if (symtab && strtab) {
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printf("\n\n");
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@ -239,8 +239,8 @@ static char *getelfsymbolname(const Elf64_Ehdr *elf, size_t mapsize,
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((shstrtab && !sym->st_name &&
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ELF64_ST_TYPE(sym->st_info) == STT_SECTION &&
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(shdr = getelfsectionheaderaddress(elf, mapsize, sym->st_shndx)) &&
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(res = getelfstring(elf, mapsize, shstrtab, shdr->sh_name))) ||
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(strtab && (res = getelfstring(elf, mapsize, strtab, sym->st_name))))) {
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(res = GetElfString(elf, mapsize, shstrtab, shdr->sh_name))) ||
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(strtab && (res = GetElfString(elf, mapsize, strtab, sym->st_name))))) {
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return res;
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} else {
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return NULL;
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@ -254,13 +254,13 @@ static void printelfrelocations(void) {
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const Elf64_Rela *rela;
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const Elf64_Shdr *shdr, *boop;
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char *strtab, *shstrtab, *symbolname;
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strtab = getelfstringtable(elf, st->st_size);
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strtab = GetElfStringTable(elf, st->st_size);
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shstrtab = getelfsectionnamestringtable(elf, st->st_size);
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for (i = 0; i < elf->e_shnum; ++i) {
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if ((shdr = getelfsectionheaderaddress(elf, st->st_size, i)) &&
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shdr->sh_type == SHT_RELA &&
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(rela = getelfsectionaddress(elf, st->st_size, shdr))) {
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printf("\n/\t%s\n", getelfsectionname(elf, st->st_size, shdr));
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printf("\n/\t%s\n", GetElfSectionName(elf, st->st_size, shdr));
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printf("\t.org\t%#x\n", (intptr_t)rela - (intptr_t)elf);
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for (j = 0; ((uintptr_t)rela + sizeof(Elf64_Rela) <=
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min((uintptr_t)elf + st->st_size,
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@ -272,7 +272,7 @@ static void printelfrelocations(void) {
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symbolname =
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getelfsymbolname(elf, st->st_size, strtab, shstrtab, &syms[sym]);
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printf("/\t%s+%#lx → %s%c%#lx\n",
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getelfstring(
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GetElfString(
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elf, st->st_size, shstrtab,
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getelfsectionheaderaddress(elf, st->st_size, shdr->sh_info)
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->sh_name),
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@ -68,6 +68,6 @@ kPollNames:
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lodsl
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add %rbx,%rax # %rbx is image base (cosmo abi)
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stosq
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loop 0b
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.loop 0b
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add $16,%rdi
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.init.end 301,_init_kPollNames
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