278 lines
8.4 KiB
C
278 lines
8.4 KiB
C
/*
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* This program is for making libtcc1.a without ar
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* tiny_libmaker - tiny elf lib maker
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* usage: tiny_libmaker [lib] files...
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* Copyright (c) 2007 Timppa
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "../../elf.h"
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#ifdef TCC_TARGET_X86_64
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# define ELFCLASSW ELFCLASS64
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# define ElfW(type) Elf##64##_##type
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# define ELFW(type) ELF##64##_##type
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#else
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# define ELFCLASSW ELFCLASS32
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# define ElfW(type) Elf##32##_##type
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# define ELFW(type) ELF##32##_##type
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#endif
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#define ARMAG "!<arch>\n"
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#define ARFMAG "`\n"
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typedef struct ArHdr {
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char ar_name[16];
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char ar_date[12];
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char ar_uid[6];
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char ar_gid[6];
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char ar_mode[8];
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char ar_size[10];
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char ar_fmag[2];
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} ArHdr;
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unsigned long le2belong(unsigned long ul) {
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return ((ul & 0xFF0000)>>8)+((ul & 0xFF000000)>>24) +
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((ul & 0xFF)<<24)+((ul & 0xFF00)<<8);
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}
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ArHdr arhdr = {
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"/ ",
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" ",
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"0 ",
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"0 ",
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"0 ",
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" ",
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ARFMAG
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};
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ArHdr arhdro = {
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" ",
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" ",
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"0 ",
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"0 ",
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"0 ",
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" ",
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ARFMAG
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};
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/* Returns 1 if s contains any of the chars of list, else 0 */
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int contains_any(const char *s, const char *list) {
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const char *l;
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for (; *s; s++) {
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for (l = list; *l; l++) {
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if (*s == *l)
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return 1;
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}
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}
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return 0;
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}
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int usage(int ret) {
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fprintf(stderr, "usage: tiny_libmaker [rcsv] lib file...\n");
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fprintf(stderr, "Always creates a new lib. [abdioptxN] are explicitly rejected.\n");
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return ret;
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}
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int main(int argc, char **argv)
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{
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FILE *fi, *fh = NULL, *fo = NULL;
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ElfW(Ehdr) *ehdr;
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ElfW(Shdr) *shdr;
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ElfW(Sym) *sym;
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int i, fsize, i_lib, i_obj;
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char *buf, *shstr, *symtab = NULL, *strtab = NULL;
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int symtabsize = 0;//, strtabsize = 0;
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char *anames = NULL;
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int *afpos = NULL;
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int istrlen, strpos = 0, fpos = 0, funccnt = 0, funcmax, hofs;
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char tfile[260], stmp[20];
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char *file, *name;
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int ret = 2;
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char *ops_conflict = "habdioptxN"; // unsupported but destructive if ignored.
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int verbose = 0;
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i_lib = 0; i_obj = 0; // will hold the index of the lib and first obj
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for (i = 1; i < argc; i++) {
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const char *a = argv[i];
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if (*a == '-' && strstr(a, "."))
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return usage(1); // -x.y is always invalid (same as gnu ar)
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if ((*a == '-') || (i == 1 && !strstr(a, "."))) { // options argument
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if (contains_any(a, ops_conflict))
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return usage(1);
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if (strstr(a, "v"))
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verbose = 1;
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} else { // lib or obj files: don't abort - keep validating all args.
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if (!i_lib) // first file is the lib
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i_lib = i;
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else if (!i_obj) // second file is the first obj
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i_obj = i;
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}
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}
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if (!i_obj) // i_obj implies also i_lib. we require both.
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return usage(1);
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if ((fh = fopen(argv[i_lib], "wb")) == NULL)
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{
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fprintf(stderr, "Can't open file %s \n", argv[i_lib]);
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goto the_end;
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}
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sprintf(tfile, "%s.tmp", argv[i_lib]);
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if ((fo = fopen(tfile, "wb+")) == NULL)
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{
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fprintf(stderr, "Can't create temporary file %s\n", tfile);
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goto the_end;
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}
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funcmax = 250;
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afpos = realloc(NULL, funcmax * sizeof *afpos); // 250 func
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memcpy(&arhdro.ar_mode, "100666", 6);
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// i_obj = first input object file
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while (i_obj < argc)
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{
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if (*argv[i_obj] == '-') { // by now, all options start with '-'
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i_obj++;
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continue;
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}
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if (verbose)
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printf("a - %s\n", argv[i_obj]);
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if ((fi = fopen(argv[i_obj], "rb")) == NULL)
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{
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fprintf(stderr, "Can't open file %s \n", argv[i_obj]);
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goto the_end;
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}
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fseek(fi, 0, SEEK_END);
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fsize = ftell(fi);
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fseek(fi, 0, SEEK_SET);
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buf = malloc(fsize + 1);
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fread(buf, fsize, 1, fi);
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fclose(fi);
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// elf header
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ehdr = (ElfW(Ehdr) *)buf;
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if (ehdr->e_ident[4] != ELFCLASSW)
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{
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fprintf(stderr, "Unsupported Elf Class: %s\n", argv[i_obj]);
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goto the_end;
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}
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shdr = (ElfW(Shdr) *) (buf + ehdr->e_shoff + ehdr->e_shstrndx * ehdr->e_shentsize);
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shstr = (char *)(buf + shdr->sh_offset);
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for (i = 0; i < ehdr->e_shnum; i++)
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{
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shdr = (ElfW(Shdr) *) (buf + ehdr->e_shoff + i * ehdr->e_shentsize);
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if (!shdr->sh_offset)
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continue;
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if (shdr->sh_type == SHT_SYMTAB)
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{
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symtab = (char *)(buf + shdr->sh_offset);
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symtabsize = shdr->sh_size;
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}
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if (shdr->sh_type == SHT_STRTAB)
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{
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if (!strcmp(shstr + shdr->sh_name, ".strtab"))
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{
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strtab = (char *)(buf + shdr->sh_offset);
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//strtabsize = shdr->sh_size;
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}
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}
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}
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if (symtab && symtabsize)
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{
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int nsym = symtabsize / sizeof(ElfW(Sym));
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//printf("symtab: info size shndx name\n");
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for (i = 1; i < nsym; i++)
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{
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sym = (ElfW(Sym) *) (symtab + i * sizeof(ElfW(Sym)));
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if (sym->st_shndx &&
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(sym->st_info == 0x10
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|| sym->st_info == 0x11
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|| sym->st_info == 0x12
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)) {
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//printf("symtab: %2Xh %4Xh %2Xh %s\n", sym->st_info, sym->st_size, sym->st_shndx, strtab + sym->st_name);
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istrlen = strlen(strtab + sym->st_name)+1;
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anames = realloc(anames, strpos+istrlen);
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strcpy(anames + strpos, strtab + sym->st_name);
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strpos += istrlen;
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if (++funccnt >= funcmax) {
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funcmax += 250;
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afpos = realloc(afpos, funcmax * sizeof *afpos); // 250 func more
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}
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afpos[funccnt] = fpos;
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}
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}
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}
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file = argv[i_obj];
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for (name = strchr(file, 0);
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name > file && name[-1] != '/' && name[-1] != '\\';
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--name);
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istrlen = strlen(name);
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if (istrlen >= sizeof(arhdro.ar_name))
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istrlen = sizeof(arhdro.ar_name) - 1;
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memset(arhdro.ar_name, ' ', sizeof(arhdro.ar_name));
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memcpy(arhdro.ar_name, name, istrlen);
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arhdro.ar_name[istrlen] = '/';
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sprintf(stmp, "%-10d", fsize);
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memcpy(&arhdro.ar_size, stmp, 10);
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fwrite(&arhdro, sizeof(arhdro), 1, fo);
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fwrite(buf, fsize, 1, fo);
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free(buf);
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i_obj++;
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fpos += (fsize + sizeof(arhdro));
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}
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hofs = 8 + sizeof(arhdr) + strpos + (funccnt+1) * sizeof(int);
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fpos = 0;
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if ((hofs & 1)) // align
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hofs++, fpos = 1;
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// write header
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fwrite("!<arch>\n", 8, 1, fh);
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sprintf(stmp, "%-10d", (int)(strpos + (funccnt+1) * sizeof(int)));
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memcpy(&arhdr.ar_size, stmp, 10);
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fwrite(&arhdr, sizeof(arhdr), 1, fh);
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afpos[0] = le2belong(funccnt);
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for (i=1; i<=funccnt; i++)
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afpos[i] = le2belong(afpos[i] + hofs);
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fwrite(afpos, (funccnt+1) * sizeof(int), 1, fh);
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fwrite(anames, strpos, 1, fh);
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if (fpos)
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fwrite("", 1, 1, fh);
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// write objects
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fseek(fo, 0, SEEK_END);
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fsize = ftell(fo);
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fseek(fo, 0, SEEK_SET);
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buf = malloc(fsize + 1);
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fread(buf, fsize, 1, fo);
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fwrite(buf, fsize, 1, fh);
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free(buf);
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ret = 0;
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the_end:
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if (anames)
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free(anames);
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if (afpos)
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free(afpos);
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if (fh)
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fclose(fh);
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if (fo)
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fclose(fo), remove(tfile);
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return ret;
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}
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