440 lines
12 KiB
C
440 lines
12 KiB
C
/* $NetBSD: elf2ecoff.c,v 1.3 1996/10/16 00:27:08 jonathan Exp $ */
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/*
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* Copyright (c) 1995
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* Ted Lemon (hereinafter referred to as the author)
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* elf2ecoff.c
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This program converts an elf executable to an ECOFF executable.
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No symbol table is retained. This is useful primarily in building
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net-bootable kernels for machines (e.g., DECstation and Alpha) which
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only support the ECOFF object file format. */
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#include <sys/types.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/exec_elf.h>
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#include <sys/exec_aout.h>
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#include <stdio.h>
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#include <sys/exec_ecoff.h>
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#include <sys/errno.h>
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#include <string.h>
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#include <limits.h>
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/* Elf Program segment permissions, in program header flags field */
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#define PF_X (1 << 0) /* Segment is executable */
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#define PF_W (1 << 1) /* Segment is writable */
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#define PF_R (1 << 2) /* Segment is readable */
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#define PF_MASKPROC 0xF0000000 /* Processor-specific reserved bits */
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struct sect {
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unsigned long vaddr;
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unsigned long len;
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};
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int phcmp ();
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char *saveRead (int file, off_t offset, off_t len, char *name);
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int copy (int, int, off_t, off_t);
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int translate_syms (int, int, off_t, off_t, off_t, off_t);
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extern int errno;
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int *symTypeTable;
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main (int argc, char **argv, char **envp)
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{
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Elf32_Ehdr ex;
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Elf32_Phdr *ph;
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Elf32_Shdr *sh;
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Elf32_Sym *symtab;
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char *shstrtab;
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int strtabix, symtabix;
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int i, pad;
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struct sect text, data, bss;
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struct ecoff_exechdr ep;
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struct ecoff_scnhdr esecs [3];
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int infile, outfile;
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unsigned long cur_vma = ULONG_MAX;
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int symflag = 0;
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text.len = data.len = bss.len = 0;
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text.vaddr = data.vaddr = bss.vaddr = 0;
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/* Check args... */
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if (argc < 3 || argc > 4)
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{
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usage:
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fprintf (stderr,
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"usage: elf2aout <elf executable> <a.out executable> [-s]\n");
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exit (1);
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}
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if (argc == 4)
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{
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if (strcmp (argv [3], "-s"))
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goto usage;
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symflag = 1;
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}
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/* Try the input file... */
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if ((infile = open (argv [1], O_RDONLY)) < 0)
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{
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fprintf (stderr, "Can't open %s for read: %s\n",
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argv [1], strerror (errno));
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exit (1);
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}
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/* Read the header, which is at the beginning of the file... */
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i = read (infile, &ex, sizeof ex);
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if (i != sizeof ex)
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{
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fprintf (stderr, "ex: %s: %s.\n",
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argv [1], i ? strerror (errno) : "End of file reached");
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exit (1);
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}
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/* Read the program headers... */
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ph = (Elf32_Phdr *)saveRead (infile, ex.e_phoff,
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ex.e_phnum * sizeof (Elf32_Phdr), "ph");
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/* Read the section headers... */
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sh = (Elf32_Shdr *)saveRead (infile, ex.e_shoff,
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ex.e_shnum * sizeof (Elf32_Shdr), "sh");
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/* Read in the section string table. */
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shstrtab = saveRead (infile, sh [ex.e_shstrndx].sh_offset,
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sh [ex.e_shstrndx].sh_size, "shstrtab");
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/* Figure out if we can cram the program header into an ECOFF
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header... Basically, we can't handle anything but loadable
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segments, but we can ignore some kinds of segments. We can't
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handle holes in the address space. Segments may be out of order,
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so we sort them first. */
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qsort (ph, ex.e_phnum, sizeof (Elf32_Phdr), phcmp);
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for (i = 0; i < ex.e_phnum; i++)
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{
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/* Section types we can ignore... */
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if (ph [i].p_type == Elf_pt_null || ph [i].p_type == Elf_pt_note ||
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ph [i].p_type == Elf_pt_phdr || ph [i].p_type == Elf_pt_mips_reginfo)
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continue;
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/* Section types we can't handle... */
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else if (ph [i].p_type != Elf_pt_load)
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{
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fprintf (stderr, "Program header %d type %d can't be converted.\n");
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exit (1);
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}
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/* Writable (data) segment? */
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if (ph [i].p_flags & PF_W)
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{
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struct sect ndata, nbss;
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ndata.vaddr = ph [i].p_vaddr;
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ndata.len = ph [i].p_filesz;
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nbss.vaddr = ph [i].p_vaddr + ph [i].p_filesz;
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nbss.len = ph [i].p_memsz - ph [i].p_filesz;
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combine (&data, &ndata, 0);
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combine (&bss, &nbss, 1);
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}
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else
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{
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struct sect ntxt;
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ntxt.vaddr = ph [i].p_vaddr;
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ntxt.len = ph [i].p_filesz;
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combine (&text, &ntxt);
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}
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/* Remember the lowest segment start address. */
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if (ph [i].p_vaddr < cur_vma)
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cur_vma = ph [i].p_vaddr;
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}
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/* Sections must be in order to be converted... */
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if (text.vaddr > data.vaddr || data.vaddr > bss.vaddr ||
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text.vaddr + text.len > data.vaddr || data.vaddr + data.len > bss.vaddr)
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{
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fprintf (stderr, "Sections ordering prevents a.out conversion.\n");
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exit (1);
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}
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/* If there's a data section but no text section, then the loader
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combined everything into one section. That needs to be the
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text section, so just make the data section zero length following
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text. */
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if (data.len && !text.len)
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{
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text = data;
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data.vaddr = text.vaddr + text.len;
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data.len = 0;
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}
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/* If there is a gap between text and data, we'll fill it when we copy
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the data, so update the length of the text segment as represented in
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a.out to reflect that, since a.out doesn't allow gaps in the program
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address space. */
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if (text.vaddr + text.len < data.vaddr)
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text.len = data.vaddr - text.vaddr;
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/* We now have enough information to cons up an a.out header... */
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ep.a.magic = ECOFF_OMAGIC;
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ep.a.vstamp = 200;
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ep.a.tsize = text.len;
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ep.a.dsize = data.len;
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ep.a.bsize = bss.len;
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ep.a.entry = ex.e_entry;
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ep.a.text_start = text.vaddr;
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ep.a.data_start = data.vaddr;
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ep.a.bss_start = bss.vaddr;
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ep.a.gprmask = 0xf3fffffe;
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bzero (&ep.a.cprmask, sizeof ep.a.cprmask);
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ep.a.gp_value = 0; /* unused. */
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ep.f.f_magic = ECOFF_MAGIC_MIPSEL;
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ep.f.f_nscns = 3;
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ep.f.f_timdat = 0; /* bogus */
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ep.f.f_symptr = 0;
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ep.f.f_nsyms = 0;
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ep.f.f_opthdr = sizeof ep.a;
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ep.f.f_flags = 0x100f; /* Stripped, not sharable. */
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strcpy (esecs [0].s_name, ".text");
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strcpy (esecs [1].s_name, ".data");
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strcpy (esecs [2].s_name, ".bss");
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esecs [0].s_paddr = esecs [0].s_vaddr = ep.a.text_start;
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esecs [1].s_paddr = esecs [1].s_vaddr = ep.a.data_start;
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esecs [2].s_paddr = esecs [2].s_vaddr = ep.a.bss_start;
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esecs [0].s_size = ep.a.tsize;
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esecs [1].s_size = ep.a.dsize;
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esecs [2].s_size = ep.a.bsize;
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esecs [0].s_scnptr = ECOFF_TXTOFF (&ep);
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esecs [1].s_scnptr = ECOFF_DATOFF (&ep);
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esecs [2].s_scnptr = esecs [1].s_scnptr +
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ECOFF_ROUND (esecs [1].s_size, ECOFF_SEGMENT_ALIGNMENT (&ep));
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esecs [0].s_relptr = esecs [1].s_relptr
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= esecs [2].s_relptr = 0;
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esecs [0].s_lnnoptr = esecs [1].s_lnnoptr
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= esecs [2].s_lnnoptr = 0;
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esecs [0].s_nreloc = esecs [1].s_nreloc = esecs [2].s_nreloc = 0;
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esecs [0].s_nlnno = esecs [1].s_nlnno = esecs [2].s_nlnno = 0;
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esecs [0].s_flags = 0x20;
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esecs [1].s_flags = 0x40;
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esecs [2].s_flags = 0x82;
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/* Make the output file... */
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if ((outfile = open (argv [2], O_WRONLY | O_CREAT, 0777)) < 0)
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{
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fprintf (stderr, "Unable to create %s: %s\n", argv [2], strerror (errno));
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exit (1);
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}
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/* Write the headers... */
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i = write (outfile, &ep.f, sizeof ep.f);
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if (i != sizeof ep.f)
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{
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perror ("ep.f: write");
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exit (1);
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for (i = 0; i < 6; i++)
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{
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printf ("Section %d: %s phys %x size %x file offset %x\n",
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i, esecs [i].s_name, esecs [i].s_paddr,
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esecs [i].s_size, esecs [i].s_scnptr);
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}
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}
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fprintf (stderr, "wrote %d byte file header.\n", i);
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i = write (outfile, &ep.a, sizeof ep.a);
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if (i != sizeof ep.a)
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{
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perror ("ep.a: write");
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exit (1);
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}
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fprintf (stderr, "wrote %d byte a.out header.\n", i);
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i = write (outfile, &esecs, sizeof esecs);
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if (i != sizeof esecs)
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{
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perror ("esecs: write");
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exit (1);
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}
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fprintf (stderr, "wrote %d bytes of section headers.\n", i);
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if (pad = ((sizeof ep.f + sizeof ep.a + sizeof esecs) & 15))
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{
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pad = 16 - pad;
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i = write (outfile, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0", pad);
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if (i < 0)
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{
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perror ("ipad: write");
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exit (1);
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}
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fprintf (stderr, "wrote %d byte pad.\n", i);
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}
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/* Copy the loadable sections. Zero-fill any gaps less than 64k;
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complain about any zero-filling, and die if we're asked to zero-fill
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more than 64k. */
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for (i = 0; i < ex.e_phnum; i++)
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{
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/* Unprocessable sections were handled above, so just verify that
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the section can be loaded before copying. */
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if (ph [i].p_type == Elf_pt_load && ph [i].p_filesz)
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{
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if (cur_vma != ph [i].p_vaddr)
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{
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unsigned long gap = ph [i].p_vaddr - cur_vma;
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char obuf [1024];
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if (gap > 65536)
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{
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fprintf (stderr, "Intersegment gap (%d bytes) too large.\n",
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gap);
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exit (1);
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}
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fprintf (stderr, "Warning: %d byte intersegment gap.\n", gap);
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memset (obuf, 0, sizeof obuf);
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while (gap)
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{
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int count = write (outfile, obuf, (gap > sizeof obuf
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? sizeof obuf : gap));
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if (count < 0)
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{
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fprintf (stderr, "Error writing gap: %s\n",
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strerror (errno));
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exit (1);
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}
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gap -= count;
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}
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}
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fprintf (stderr, "writing %d bytes...\n", ph [i].p_filesz);
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copy (outfile, infile, ph [i].p_offset, ph [i].p_filesz);
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cur_vma = ph [i].p_vaddr + ph [i].p_filesz;
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}
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}
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/* Looks like we won... */
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exit (0);
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}
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copy (out, in, offset, size)
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int out, in;
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off_t offset, size;
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{
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char ibuf [4096];
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int remaining, cur, count;
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/* Go the the start of the ELF symbol table... */
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if (lseek (in, offset, SEEK_SET) < 0)
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{
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perror ("copy: lseek");
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exit (1);
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}
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remaining = size;
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while (remaining)
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{
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cur = remaining;
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if (cur > sizeof ibuf)
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cur = sizeof ibuf;
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remaining -= cur;
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if ((count = read (in, ibuf, cur)) != cur)
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{
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fprintf (stderr, "copy: read: %s\n",
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count ? strerror (errno) : "premature end of file");
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exit (1);
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}
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if ((count = write (out, ibuf, cur)) != cur)
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{
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perror ("copy: write");
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exit (1);
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}
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}
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}
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/* Combine two segments, which must be contiguous. If pad is true, it's
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okay for there to be padding between. */
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combine (base, new, pad)
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struct sect *base, *new;
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int pad;
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{
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if (!base -> len)
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*base = *new;
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else if (new -> len)
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{
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if (base -> vaddr + base -> len != new -> vaddr)
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{
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if (pad)
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base -> len = new -> vaddr - base -> vaddr;
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else
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{
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fprintf (stderr,
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"Non-contiguous data can't be converted.\n");
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exit (1);
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}
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}
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base -> len += new -> len;
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}
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}
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int
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phcmp (h1, h2)
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Elf32_Phdr *h1, *h2;
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{
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if (h1 -> p_vaddr > h2 -> p_vaddr)
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return 1;
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else if (h1 -> p_vaddr < h2 -> p_vaddr)
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return -1;
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else
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return 0;
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}
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char *saveRead (int file, off_t offset, off_t len, char *name)
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{
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char *tmp;
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int count;
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off_t off;
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if ((off = lseek (file, offset, SEEK_SET)) < 0)
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{
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fprintf (stderr, "%s: fseek: %s\n", name, strerror (errno));
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exit (1);
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}
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if (!(tmp = (char *)malloc (len)))
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{
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fprintf (stderr, "%s: Can't allocate %d bytes.\n", name, len);
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exit (1);
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}
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count = read (file, tmp, len);
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if (count != len)
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{
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fprintf (stderr, "%s: read: %s.\n",
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name, count ? strerror (errno) : "End of file reached");
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exit (1);
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}
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return tmp;
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}
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