elf2ecoff.c
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- /*
- * Copyright (c) 1995
- * Ted Lemon (hereinafter referred to as the author)
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- /* elf2ecoff.c
- This program converts an elf executable to an ECOFF executable.
- No symbol table is retained. This is useful primarily in building
- net-bootable kernels for machines (e.g., DECstation and Alpha) which
- only support the ECOFF object file format. */
- #include <stdio.h>
- #include <string.h>
- #include <errno.h>
- #include <sys/types.h>
- #include <fcntl.h>
- #include <unistd.h>
- #include <elf.h>
- #include <limits.h>
- #include "ecoff.h"
- /*
- * Some extra ELF definitions
- */
- #define PT_MIPS_REGINFO 0x70000000 /* Register usage information */
- /* -------------------------------------------------------------------- */
- struct sect {
- unsigned long vaddr;
- unsigned long len;
- };
- int phcmp ();
- char *saveRead (int file, off_t offset, off_t len, char *name);
- int copy (int, int, off_t, off_t);
- int translate_syms (int, int, off_t, off_t, off_t, off_t);
- void convert_elf_hdr (Elf32_Ehdr *);
- void convert_elf_phdrs (Elf32_Phdr *, int);
- void convert_elf_shdrs (Elf32_Shdr *, int);
- void convert_ecoff_filehdr(struct filehdr *);
- void convert_ecoff_aouthdr(struct aouthdr *);
- void convert_ecoff_esecs(struct scnhdr *, int);
- extern int errno;
- int *symTypeTable;
- int must_convert_endian = 0;
- int format_bigendian = 0;
- main (int argc, char **argv, char **envp)
- {
- Elf32_Ehdr ex;
- Elf32_Phdr *ph;
- Elf32_Shdr *sh;
- Elf32_Sym *symtab;
- char *shstrtab;
- int strtabix, symtabix;
- int i, pad;
- struct sect text, data, bss;
- struct filehdr efh;
- struct aouthdr eah;
- struct scnhdr esecs [6];
- int infile, outfile;
- unsigned long cur_vma = ULONG_MAX;
- int addflag = 0;
- int nosecs;
- text.len = data.len = bss.len = 0;
- text.vaddr = data.vaddr = bss.vaddr = 0;
- /* Check args... */
- if (argc < 3 || argc > 4)
- {
- usage:
- fprintf (stderr,
- "usage: elf2aout <elf executable> <a.out executable> [-a]n");
- exit (1);
- }
- if (argc == 4)
- {
- if (strcmp (argv [3], "-a"))
- goto usage;
- addflag = 1;
- }
- /* Try the input file... */
- if ((infile = open (argv [1], O_RDONLY)) < 0)
- {
- fprintf (stderr, "Can't open %s for read: %sn",
- argv [1], strerror (errno));
- exit (1);
- }
- /* Read the header, which is at the beginning of the file... */
- i = read (infile, &ex, sizeof ex);
- if (i != sizeof ex)
- {
- fprintf (stderr, "ex: %s: %s.n",
- argv [1], i ? strerror (errno) : "End of file reached");
- exit (1);
- }
- if (ex.e_ident[EI_DATA] == ELFDATA2MSB)
- format_bigendian = 1;
- if (ntohs (0xaa55) == 0xaa55) {
- if (!format_bigendian)
- must_convert_endian = 1;
- } else {
- if (format_bigendian)
- must_convert_endian = 1;
- }
- if (must_convert_endian)
- convert_elf_hdr (&ex);
- /* Read the program headers... */
- ph = (Elf32_Phdr *)saveRead (infile, ex.e_phoff,
- ex.e_phnum * sizeof (Elf32_Phdr), "ph");
- if (must_convert_endian)
- convert_elf_phdrs (ph, ex.e_phnum);
- /* Read the section headers... */
- sh = (Elf32_Shdr *)saveRead (infile, ex.e_shoff,
- ex.e_shnum * sizeof (Elf32_Shdr), "sh");
- if (must_convert_endian)
- convert_elf_shdrs (sh, ex.e_shnum);
- /* Read in the section string table. */
- shstrtab = saveRead (infile, sh [ex.e_shstrndx].sh_offset,
- sh [ex.e_shstrndx].sh_size, "shstrtab");
- /* Figure out if we can cram the program header into an ECOFF
- header... Basically, we can't handle anything but loadable
- segments, but we can ignore some kinds of segments. We can't
- handle holes in the address space. Segments may be out of order,
- so we sort them first. */
- qsort (ph, ex.e_phnum, sizeof (Elf32_Phdr), phcmp);
- for (i = 0; i < ex.e_phnum; i++)
- {
- /* Section types we can ignore... */
- if (ph [i].p_type == PT_NULL || ph [i].p_type == PT_NOTE ||
- ph [i].p_type == PT_PHDR || ph [i].p_type == PT_MIPS_REGINFO)
- continue;
- /* Section types we can't handle... */
- else if (ph [i].p_type != PT_LOAD)
- {
- fprintf (stderr, "Program header %d type %d can't be converted.n");
- exit (1);
- }
- /* Writable (data) segment? */
- if (ph [i].p_flags & PF_W)
- {
- struct sect ndata, nbss;
- ndata.vaddr = ph [i].p_vaddr;
- ndata.len = ph [i].p_filesz;
- nbss.vaddr = ph [i].p_vaddr + ph [i].p_filesz;
- nbss.len = ph [i].p_memsz - ph [i].p_filesz;
- combine (&data, &ndata, 0);
- combine (&bss, &nbss, 1);
- }
- else
- {
- struct sect ntxt;
- ntxt.vaddr = ph [i].p_vaddr;
- ntxt.len = ph [i].p_filesz;
- combine (&text, &ntxt, 0);
- }
- /* Remember the lowest segment start address. */
- if (ph [i].p_vaddr < cur_vma)
- cur_vma = ph [i].p_vaddr;
- }
- /* Sections must be in order to be converted... */
- if (text.vaddr > data.vaddr || data.vaddr > bss.vaddr ||
- text.vaddr + text.len > data.vaddr || data.vaddr + data.len > bss.vaddr)
- {
- fprintf (stderr, "Sections ordering prevents a.out conversion.n");
- exit (1);
- }
- /* If there's a data section but no text section, then the loader
- combined everything into one section. That needs to be the
- text section, so just make the data section zero length following
- text. */
- if (data.len && !text.len)
- {
- text = data;
- data.vaddr = text.vaddr + text.len;
- data.len = 0;
- }
- /* If there is a gap between text and data, we'll fill it when we copy
- the data, so update the length of the text segment as represented in
- a.out to reflect that, since a.out doesn't allow gaps in the program
- address space. */
- if (text.vaddr + text.len < data.vaddr)
- text.len = data.vaddr - text.vaddr;
- /* We now have enough information to cons up an a.out header... */
- eah.magic = OMAGIC;
- eah.vstamp = 200;
- eah.tsize = text.len;
- eah.dsize = data.len;
- eah.bsize = bss.len;
- eah.entry = ex.e_entry;
- eah.text_start = text.vaddr;
- eah.data_start = data.vaddr;
- eah.bss_start = bss.vaddr;
- eah.gprmask = 0xf3fffffe;
- memset (&eah.cprmask, ' ', sizeof eah.cprmask);
- eah.gp_value = 0; /* unused. */
- if (format_bigendian)
- efh.f_magic = MIPSEBMAGIC;
- else
- efh.f_magic = MIPSELMAGIC;
- if (addflag)
- nosecs = 6;
- else
- nosecs = 3;
- efh.f_nscns = nosecs;
- efh.f_timdat = 0; /* bogus */
- efh.f_symptr = 0;
- efh.f_nsyms = 0;
- efh.f_opthdr = sizeof eah;
- efh.f_flags = 0x100f; /* Stripped, not sharable. */
- memset (esecs, 0, sizeof esecs);
- strcpy (esecs [0].s_name, ".text");
- strcpy (esecs [1].s_name, ".data");
- strcpy (esecs [2].s_name, ".bss");
- if (addflag) {
- strcpy (esecs [3].s_name, ".rdata");
- strcpy (esecs [4].s_name, ".sdata");
- strcpy (esecs [5].s_name, ".sbss");
- }
- esecs [0].s_paddr = esecs [0].s_vaddr = eah.text_start;
- esecs [1].s_paddr = esecs [1].s_vaddr = eah.data_start;
- esecs [2].s_paddr = esecs [2].s_vaddr = eah.bss_start;
- if (addflag) {
- esecs [3].s_paddr = esecs [3].s_vaddr = 0;
- esecs [4].s_paddr = esecs [4].s_vaddr = 0;
- esecs [5].s_paddr = esecs [5].s_vaddr = 0;
- }
- esecs [0].s_size = eah.tsize;
- esecs [1].s_size = eah.dsize;
- esecs [2].s_size = eah.bsize;
- if (addflag) {
- esecs [3].s_size = 0;
- esecs [4].s_size = 0;
- esecs [5].s_size = 0;
- }
- esecs [0].s_scnptr = N_TXTOFF (efh, eah);
- esecs [1].s_scnptr = N_DATOFF (efh, eah);
- #define ECOFF_SEGMENT_ALIGNMENT(a) 0x10
- #define ECOFF_ROUND(s,a) (((s)+(a)-1)&~((a)-1))
- esecs [2].s_scnptr = esecs [1].s_scnptr +
- ECOFF_ROUND (esecs [1].s_size, ECOFF_SEGMENT_ALIGNMENT (&eah));
- if (addflag) {
- esecs [3].s_scnptr = 0;
- esecs [4].s_scnptr = 0;
- esecs [5].s_scnptr = 0;
- }
- esecs [0].s_relptr = esecs [1].s_relptr
- = esecs [2].s_relptr = 0;
- esecs [0].s_lnnoptr = esecs [1].s_lnnoptr
- = esecs [2].s_lnnoptr = 0;
- esecs [0].s_nreloc = esecs [1].s_nreloc = esecs [2].s_nreloc = 0;
- esecs [0].s_nlnno = esecs [1].s_nlnno = esecs [2].s_nlnno = 0;
- if (addflag) {
- esecs [3].s_relptr = esecs [4].s_relptr
- = esecs [5].s_relptr = 0;
- esecs [3].s_lnnoptr = esecs [4].s_lnnoptr
- = esecs [5].s_lnnoptr = 0;
- esecs [3].s_nreloc = esecs [4].s_nreloc = esecs [5].s_nreloc = 0;
- esecs [3].s_nlnno = esecs [4].s_nlnno = esecs [5].s_nlnno = 0;
- }
- esecs [0].s_flags = 0x20;
- esecs [1].s_flags = 0x40;
- esecs [2].s_flags = 0x82;
- if (addflag) {
- esecs [3].s_flags = 0x100;
- esecs [4].s_flags = 0x200;
- esecs [5].s_flags = 0x400;
- }
- /* Make the output file... */
- if ((outfile = open (argv [2], O_WRONLY | O_CREAT, 0777)) < 0)
- {
- fprintf (stderr, "Unable to create %s: %sn", argv [2], strerror (errno));
- exit (1);
- }
- if (must_convert_endian)
- convert_ecoff_filehdr (&efh);
- /* Write the headers... */
- i = write (outfile, &efh, sizeof efh);
- if (i != sizeof efh)
- {
- perror ("efh: write");
- exit (1);
- for (i = 0; i < nosecs; i++)
- {
- printf ("Section %d: %s phys %x size %x file offset %xn",
- i, esecs [i].s_name, esecs [i].s_paddr,
- esecs [i].s_size, esecs [i].s_scnptr);
- }
- }
- fprintf (stderr, "wrote %d byte file header.n", i);
- if (must_convert_endian)
- convert_ecoff_aouthdr (&eah);
- i = write (outfile, &eah, sizeof eah);
- if (i != sizeof eah)
- {
- perror ("eah: write");
- exit (1);
- }
- fprintf (stderr, "wrote %d byte a.out header.n", i);
- if (must_convert_endian)
- convert_ecoff_esecs (&esecs[0], nosecs);
- i = write (outfile, &esecs, nosecs * sizeof(struct scnhdr));
- if (i != nosecs * sizeof(struct scnhdr))
- {
- perror ("esecs: write");
- exit (1);
- }
- fprintf (stderr, "wrote %d bytes of section headers.n", i);
- if (pad = ((sizeof efh + sizeof eah + nosecs * sizeof(struct scnhdr)) & 15))
- {
- pad = 16 - pad;
- i = write (outfile, "