From f90d9de7e22978f8dced5543149ff0db4867bbce Mon Sep 17 00:00:00 2001 From: graichen Date: Sun, 22 Dec 1996 15:03:32 +0000 Subject: [PATCH] import of elf2aout - required for the pmax and taken from the NetBSD elftools - adapted to OpenBSD by me --- usr.bin/elf2aout/Makefile | 5 + usr.bin/elf2aout/elf2aout.1 | 57 ++++ usr.bin/elf2aout/elf2aout.c | 514 ++++++++++++++++++++++++++++++++++++ 3 files changed, 576 insertions(+) create mode 100644 usr.bin/elf2aout/Makefile create mode 100644 usr.bin/elf2aout/elf2aout.1 create mode 100644 usr.bin/elf2aout/elf2aout.c diff --git a/usr.bin/elf2aout/Makefile b/usr.bin/elf2aout/Makefile new file mode 100644 index 00000000000..20eae645658 --- /dev/null +++ b/usr.bin/elf2aout/Makefile @@ -0,0 +1,5 @@ +# $OpenBSD: Makefile,v 1.1.1.1 1996/12/22 15:03:32 graichen Exp $ + +PROG= elf2aout + +.include diff --git a/usr.bin/elf2aout/elf2aout.1 b/usr.bin/elf2aout/elf2aout.1 new file mode 100644 index 00000000000..f7dc58b491d --- /dev/null +++ b/usr.bin/elf2aout/elf2aout.1 @@ -0,0 +1,57 @@ +.\" $OpenBSD: elf2aout.1,v 1.1.1.1 1996/12/22 15:03:32 graichen Exp $ +.\" +.\" Copyright (c) 1996 Per Fogelstrom +.\" +.\" 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. All advertising materials mentioning features or use of this software +.\" must display the following acknowledgement: +.\" This product includes software developed under OpenBSD by +.\" Per Fogelstrom. +.\" 4. 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. +.\" +.\" +.Dd Octobert 2, 1996 +.Dt ELF2AOUT 1 +.Os +.Sh NAME +.Nm elf2aout +.Nd convert elf executable to a.out format +.Sh SYNOPSIS +.Nm elf2aout +.Op Ar elfexec +.Oo +.Ar ecoffexec +.Oc +.Sh DESCRIPTION +.Nm elf2aout +reads and convert the file specified as +.Ar elfexec +to a.out format, into file +.Ar ecoffexec +, suitable for bootstrapping certain +.Nm MIPS +systems. Systems requiering this +conversion is the +.Nm pmax. +.Sh DIAGNOSTICS +If the conversion fails a diagnostic message is printed to explain the cause. diff --git a/usr.bin/elf2aout/elf2aout.c b/usr.bin/elf2aout/elf2aout.c new file mode 100644 index 00000000000..09f56a75d0e --- /dev/null +++ b/usr.bin/elf2aout/elf2aout.c @@ -0,0 +1,514 @@ +/* + * 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. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define SHN_MIPS_ACOMMON 0xfff0 + +extern char *__progname; + +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); +extern int errno; +int *symTypeTable; + +/* Symbol table entry... */ +struct sym { + unsigned long name; /* Index into strtab of symbol name. */ + unsigned long value; /* Section offset, virt addr or common align. */ + unsigned long size; /* Size of object referenced. */ + unsigned type : 4; /* Symbol type (e.g., function, data)... */ + unsigned binding : 4; /* Symbol binding (e.g., global, local)... */ + unsigned char other; /* Unused. */ + unsigned short shndx; /* Section containing symbol. */ +}; + +struct phdr { + unsigned long type; /* Segment type... */ + unsigned long offset; /* File offset... */ + unsigned long vaddr; /* Virtual address... */ + unsigned long paddr; /* Physical address... */ + unsigned long filesz; /* Size of segment in file... */ + unsigned long memsz; /* Size of segment in memory... */ + unsigned long flags; /* Segment flags... */ + unsigned long align; /* Alighment, file and memory... */ +}; + +main (int argc, char **argv, char **envp) +{ + Elf32_Ehdr ex; + Elf32_Phdr *ph; + Elf32_Shdr *sh; + struct sym *symtab; + char *shstrtab; + int strtabix, symtabix; + int i; + struct sect text, data, bss; + struct exec aex; + int infile, outfile; + unsigned long cur_vma = ULONG_MAX; + int symflag = 0; + + 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: %s \n", __progname); + exit (1); + } + + /* Try the input file... */ + if ((infile = open (argv [1], O_RDONLY)) < 0) + { + fprintf (stderr, "Can't open %s for read: %s\n", + 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); + } + + /* Read the program headers... */ + ph = (Elf32_Phdr *)saveRead (infile, ex.e_phoff, + ex.e_phnum * sizeof (Elf32_Phdr), "ph"); + /* Read the section headers... */ + sh = (Elf32_Shdr *)saveRead (infile, ex.e_shoff, + ex.e_shnum * sizeof (Elf32_Shdr), "sh"); + /* Read in the section string table. */ + shstrtab = saveRead (infile, sh [ex.e_shstrndx].sh_offset, + sh [ex.e_shstrndx].sh_size, "shstrtab"); + + /* Find space for a table matching ELF section indices to a.out symbol + types. */ + symTypeTable = (int *)malloc (ex.e_shnum * sizeof (int)); + if (!symTypeTable) + { + fprintf (stderr, "symTypeTable: can't allocate.\n"); + exit (1); + } + memset (symTypeTable, 0, ex.e_shnum * sizeof (int)); + + /* Look for the symbol table and string table... + Also map section indices to symbol types for a.out */ + for (i = 0; i < ex.e_shnum; i++) + { + char *name = shstrtab + sh [i].sh_name; + if (!strcmp (name, ".symtab")) + symtabix = i; + else if (!strcmp (name, ".strtab")) + strtabix = i; + else if (!strcmp (name, ".text") || !strcmp (name, ".rodata")) + symTypeTable [i] = N_TEXT; + else if (!strcmp (name, ".data") || !strcmp (name, ".sdata") || + !strcmp (name, ".lit4") || !strcmp (name, ".lit8")) + symTypeTable [i] = N_DATA; + else if (!strcmp (name, ".bss") || !strcmp (name, ".sbss")) + symTypeTable [i] = N_BSS; + } + + /* Figure out if we can cram the program header into an a.out 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, and we handle start addresses other than 0x1000 by + hoping that the loader will know where to load - a.out doesn't have + an explicit load address. 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); + } + /* 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... */ + aex.a_midmag = htonl ((symflag << 26) | (MID_PMAX << 16) | OMAGIC); + aex.a_text = text.len; + aex.a_data = data.len; + aex.a_bss = bss.len; + aex.a_entry = ex.e_entry; + aex.a_syms = (sizeof (struct nlist) * + (symtabix != -1 + ? sh [symtabix].sh_size / sizeof (struct sym) : 0)); + aex.a_trsize = 0; + aex.a_drsize = 0; + + /* Make the output file... */ + if ((outfile = open (argv [2], O_WRONLY | O_CREAT, 0777)) < 0) + { + fprintf (stderr, "Unable to create %s: %s\n", argv [2], strerror (errno)); + exit (1); + } + /* Write the header... */ + i = write (outfile, &aex, sizeof aex); + if (i != sizeof aex) + { + perror ("aex: write"); + exit (1); + } + + /* Copy the loadable sections. Zero-fill any gaps less than 64k; + complain about any zero-filling, and die if we're asked to zero-fill + more than 64k. */ + for (i = 0; i < ex.e_phnum; i++) + { + /* Unprocessable sections were handled above, so just verify that + the section can be loaded before copying. */ + if (ph [i].p_type == PT_LOAD && ph [i].p_filesz) + { + if (cur_vma != ph [i].p_vaddr) + { + unsigned long gap = ph [i].p_vaddr - cur_vma; + char obuf [1024]; + if (gap > 65536) + { + fprintf (stderr, "Intersegment gap (%d bytes) too large.\n", + gap); + exit (1); + } + fprintf (stderr, "Warning: %d byte intersegment gap.\n", gap); + memset (obuf, 0, sizeof obuf); + while (gap) + { + int count = write (outfile, obuf, (gap > sizeof obuf + ? sizeof obuf : gap)); + if (count < 0) + { + fprintf (stderr, "Error writing gap: %s\n", + strerror (errno)); + exit (1); + } + gap -= count; + } + } + copy (outfile, infile, ph [i].p_offset, ph [i].p_filesz); + cur_vma = ph [i].p_vaddr + ph [i].p_filesz; + } + } + + /* Copy and translate the symbol table... */ + translate_syms (outfile, infile, sh [symtabix].sh_offset, + sh [symtabix].sh_size, + sh [strtabix].sh_offset, sh [strtabix].sh_size); + + /* Looks like we won... */ + exit (0); +} + +/* translate_syms (out, in, offset, size) + + Read the ELF symbol table from in at offset; translate it into a.out + nlist format and write it to out. */ + +translate_syms (out, in, symoff, symsize, stroff, strsize) + int out, in; + off_t symoff, symsize; + off_t stroff, strsize; +{ +# define SYMS_PER_PASS 64 + struct sym inbuf [64]; + struct nlist outbuf [64]; + int i, remaining, cur; + char *oldstrings; + char *newstrings, *nsp; + int newstringsize; + + /* Zero the unused fields in the output buffer.. */ + memset (outbuf, 0, sizeof outbuf); + + /* Find number of symbols to process... */ + remaining = symsize / sizeof (struct sym); + + /* Suck in the old string table... */ + oldstrings = saveRead (in, stroff, strsize, "string table"); + + /* Allocate space for the new one. XXX We make the wild assumption that + no two symbol table entries will point at the same place in the + string table - if that assumption is bad, this could easily blow up. */ + newstringsize = strsize + remaining; + newstrings = (char *)malloc (newstringsize); + if (!newstrings) + { + fprintf (stderr, "No memory for new string table!\n"); + exit (1); + } + /* Initialize the table pointer... */ + nsp = newstrings; + + /* Go the the start of the ELF symbol table... */ + if (lseek (in, symoff, SEEK_SET) < 0) + { + perror ("translate_syms: lseek"); + exit (1); + } + + /* Translate and copy symbols... */ + while (remaining) + { + cur = remaining; + if (cur > SYMS_PER_PASS) + cur = SYMS_PER_PASS; + remaining -= cur; + if ((i = read (in, inbuf, cur * sizeof (struct sym))) + != cur * sizeof (struct sym)) + { + if (i < 0) + perror ("translate_syms"); + else + fprintf (stderr, "translate_syms: premature end of file.\n"); + exit (1); + } + + /* Do the translation... */ + for (i = 0; i < cur; i++) + { + /* Copy the symbol into the new table, but prepend an underscore. */ + *nsp = '_'; + strcpy (nsp + 1, oldstrings + inbuf [i].name); + outbuf [i].n_un.n_strx = nsp - newstrings + 4; + nsp += strlen (nsp) + 1; + + /* Convert ELF symbol type/section/etc info into a.out type info. */ + if (inbuf [i].type == STT_FILE) + outbuf [i].n_type = N_FN; + else if (inbuf [i].shndx == SHN_UNDEF) + outbuf [i].n_type = N_UNDF; + else if (inbuf [i].shndx == SHN_ABS) + outbuf [i].n_type = N_ABS; + else if (inbuf [i].shndx == SHN_COMMON || + inbuf [i].shndx == SHN_MIPS_ACOMMON) + outbuf [i].n_type = N_COMM; + else + outbuf [i].n_type = symTypeTable [inbuf [i].shndx]; + if (inbuf [i].binding == STB_GLOBAL) + outbuf [i].n_type |= N_EXT; + /* Symbol values in executables should be compatible. */ + outbuf [i].n_value = inbuf [i].value; + } + /* Write out the symbols... */ + if ((i = write (out, outbuf, cur * sizeof (struct nlist))) + != cur * sizeof (struct nlist)) + { + fprintf (stderr, "translate_syms: write: %s\n", strerror (errno)); + exit (1); + } + } + /* Write out the string table length... */ + if (write (out, &newstringsize, sizeof newstringsize) + != sizeof newstringsize) + { + fprintf (stderr, + "translate_syms: newstringsize: %s\n", strerror (errno)); + exit (1); + } + /* Write out the string table... */ + if (write (out, newstrings, newstringsize) != newstringsize) + { + fprintf (stderr, "translate_syms: newstrings: %s\n", strerror (errno)); + exit (1); + } +} + +copy (out, in, offset, size) + int out, in; + off_t offset, size; +{ + char ibuf [4096]; + int remaining, cur, count; + + /* Go the the start of the ELF symbol table... */ + if (lseek (in, offset, SEEK_SET) < 0) + { + perror ("copy: lseek"); + exit (1); + } + + remaining = size; + while (remaining) + { + cur = remaining; + if (cur > sizeof ibuf) + cur = sizeof ibuf; + remaining -= cur; + if ((count = read (in, ibuf, cur)) != cur) + { + fprintf (stderr, "copy: read: %s\n", + count ? strerror (errno) : "premature end of file"); + exit (1); + } + if ((count = write (out, ibuf, cur)) != cur) + { + perror ("copy: write"); + exit (1); + } + } +} + +/* Combine two segments, which must be contiguous. If pad is true, it's + okay for there to be padding between. */ +combine (base, new, pad) + struct sect *base, *new; + int pad; +{ + if (!base -> len) + *base = *new; + else if (new -> len) + { + if (base -> vaddr + base -> len != new -> vaddr) + { + if (pad) + base -> len = new -> vaddr - base -> vaddr; + else + { + fprintf (stderr, + "Non-contiguous data can't be converted.\n"); + exit (1); + } + } + base -> len += new -> len; + } +} + +phcmp (h1, h2) + struct phdr *h1, *h2; +{ + if (h1 -> vaddr > h2 -> vaddr) + return 1; + else if (h1 -> vaddr < h2 -> vaddr) + return -1; + else + return 0; +} + +char *saveRead (int file, off_t offset, off_t len, char *name) +{ + char *tmp; + int count; + off_t off; + if ((off = lseek (file, offset, SEEK_SET)) < 0) + { + fprintf (stderr, "%s: fseek: %s\n", name, strerror (errno)); + exit (1); + } + if (!(tmp = (char *)malloc (len))) + { + fprintf (stderr, "%s: Can't allocate %d bytes.\n", name, len); + exit (1); + } + count = read (file, tmp, len); + if (count != len) + { + fprintf (stderr, "%s: read: %s.\n", + name, count ? strerror (errno) : "End of file reached"); + exit (1); + } + return tmp; +} -- 2.20.1