dump/common/dump.c

	dump.c revision ba2be53024c0b999e74ba9adcd7d80fec5df8c57
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 *  Copyright (c) 1988 AT&T
 *    All Rights Reserved
 *
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/* Get definitions for the relocation types supported. */
#define ELF_TARGET_ALL

#include <stdio.h>
#include <stdlib.h>
#include <locale.h>
#include <unistd.h>
#include <libelf.h>
#include <sys/link.h>
#include <sys/elf.h>
#include <sys/machelf.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <errno.h>
#include <string.h>
#include "sgs.h"
#include "conv.h"
#include "dump.h"


#define OPTSTR  "agcd:fhn:oprstvCLT:V?"     /* option string for getopt() */

/*
 * DUMP_CONVFMT defines the libconv formatting options we want to use:
 *  - Unknown items to be printed as integers using decimal formatting
 *  - The "Dump Style" versions of strings.
 */
#define DUMP_CONVFMT (CONV_FMT_DECIMAL|CONV_FMT_ALT_DUMP)

const char *UNKNOWN = "<unknown>";

static SCNTAB *p_symtab, *p_head_scns, *p_dynsym;

static int
    x_flag = 0, /* option requires section header table */
    z_flag = 0, /* process files within an archive */
    rn_flag = 0;    /* dump named relocation information */

static int
    /* flags: ?_flag corresponds to ? option */
    a_flag = 0, /* dump archive header of each member of archive */
    g_flag = 0, /* dump archive symbol table */
    c_flag = 0, /* dump the string table */
    d_flag = 0, /* dump range of sections */
    f_flag = 0, /* dump each file header */
    h_flag = 0, /* dump section headers */
    n_flag = 0, /* dump named section */
    o_flag = 0, /* dump each program execution header */
    r_flag = 0, /* dump relocation information */
    s_flag = 0, /* dump section contents */
    t_flag = 0, /* dump symbol table entries */
    C_flag = 0, /* dump decoded C++ symbol names */
    L_flag = 0, /* dump dynamic linking information */
    T_flag = 0, /* dump symbol table range */
    V_flag = 0; /* dump version information */

int p_flag = 0, /* suppress printing of headings */
    v_flag = 0; /* print information in verbose form */

static int
    d_low = 0,  /* range for use with -d */
    d_hi = 0,
    d_num = 0;

static int
    T_low = 0,  /* range for use with -T */
    T_hi = 0,
    T_num = 0;

static char *name = NULL; /* for use with -n option */
char *prog_name;
static int errflag = 0;

static struct stab_list_s {
    struct stab_list_s *next;
    char *strings;
    size_t size;
} *StringTableList = (void *)0;

extern void ar_sym_read();
extern void dump_exec_header();


/*
 * Get the section descriptor and set the size of the
 * data returned.  Data is byte-order converted.
 */
void *
get_scndata(Elf_Scn *fd_scn, size_t *size)
{
    Elf_Data *p_data;

    p_data = 0;
    if ((p_data = elf_getdata(fd_scn, p_data)) == 0 ||
        p_data->d_size == 0) {
        return (NULL);
    }
    *size = p_data->d_size;
    return (p_data->d_buf);
}

/*
 * Get the section descriptor and set the size of the
 * data returned.  Data is raw (i.e., not byte-order converted).
 */
static void *
get_rawscn(Elf_Scn *fd_scn, size_t *size)
{
    Elf_Data *p_data;

    p_data = 0;
    if ((p_data = elf_rawdata(fd_scn, p_data)) == 0 ||
        p_data->d_size == 0) {
        return (NULL);
    }

    *size = p_data->d_size;
    return (p_data->d_buf);
}

/*
 * Print out a usage message in short form when program is invoked
 * with insufficient or no arguments, and in long form when given
 * either a ? or an invalid option.
 */
static void
usage()
{
    (void) fprintf(stderr,
    "Usage: %s [-%s] file(s) ...\n", prog_name, OPTSTR);
    if (errflag) {
        (void) fprintf(stderr,
        "\t\t[-a dump archive header of each member of archive]\n\
        [-g dump archive global symbol table]\n\
        [-c dump the string table]\n\
        [-d dump range of sections]\n\
        [-f dump each file header]\n\
        [-h dump section headers]\n\
        [-n dump named section]\n\
        [-o dump each program execution header]\n\
        [-p suppress printing of headings]\n\
        [-r dump relocation information]\n\
        [-s dump section contents]\n\
        [-t dump symbol table entries]\n\
        [-v print information in verbose form]\n\
        [-C dump decoded C++ symbol names]\n\
        [-L dump the .dynamic structure]\n\
        [-T dump symbol table range]\n\
        [-V dump version information]\n");
    }
}

/*
 * Set a range.  Input is a character string, a lower
 * bound and an upper bound.  This function converts
 * a character string into its correct integer values,
 * setting the first value as the lower bound, and
 * the second value as the upper bound.  If more values
 * are given they are ignored with a warning.
 */
static void
set_range(char *s, int  *low, int  *high)
{
    char *w;
    char *lasts;

    while ((w = strtok_r(s, ",", &lasts)) != NULL) {
        if (!(*low))
            /* LINTED */
            *low = (int)atol(w);
        else
            if (!(*high))
                /* LINTED */
                *high = (int)atol(w);
            else {
                (void) fprintf(stderr,
                    "%s: too many arguments - %s ignored\n",
                    prog_name, w);
                return;
            }
        s = NULL;
    } /* end while */
}


/*
 * Print static shared library information.
 */
static void
print_static(SCNTAB *l_scns, char *filename)
{
    size_t section_size;
    unsigned char *strtab;
    unsigned char *path, buf[1024];
    unsigned long *temp;
    unsigned long total, topath;

    (void) printf("\n  **** STATIC SHARED LIBRARY INFORMATION ****\n");
    (void) printf("\n%s:\n", filename);
    (void) printf("\t");
    section_size  = 0;
    if ((strtab = (unsigned char *)
        get_scndata(l_scns->p_sd, &section_size)) == NULL) {
        return;
    }

    while (section_size != 0) {
        /* LINTED */
        temp = (unsigned long *)strtab;
        total = temp[0];
        topath = temp[1];
        path = strtab + (topath*sizeof (long));
        (void) strncpy((char *)buf, (char *)path,
            (total - topath)*sizeof (long));
        (void) fprintf(stdout, "%s\n", buf);
        strtab += total*sizeof (long);
        section_size -= (total*sizeof (long));
    }
}

/*
 * Print raw data in hexidecimal.  Input is the section data to
 * be printed out and the size of the data.  Output is relative
 * to a table lookup in dumpmap.h.
 */
static void
print_rawdata(unsigned char *p_sec, size_t size)
{
    size_t   j;
    size_t   count;

    count = 1;

    (void) printf("\t");
    for (j = size/sizeof (short); j != 0; --j, ++count) {
        (void) printf("%.2x %.2x ", p_sec[0], p_sec[1]);
        p_sec += 2;
        if (count == 12) {
            (void) printf("\n\t");
            count = 0;
        }
    }

    /*
     * take care of last byte if odd byte section
     */
    if ((size & 0x1L) == 1L)
        (void) printf("%.2x", *p_sec);
    (void) printf("\n");
}


/*
 * Print relocation data of type SHT_RELA
 * If d_flag, print data corresponding only to
 * the section or range of sections specified.
 * If n_flag, print data corresponding only to
 * the named section.
 */
static void
print_rela(Elf *elf_file, SCNTAB *p_scns, Elf_Data *rdata, Elf_Data *sym_data,
    GElf_Ehdr * p_ehdr, size_t reloc_size, size_t sym_size, char *filename,
    SCNTAB *reloc_symtab)
{
    GElf_Rela rela;
    GElf_Sym sym;
    size_t no_entries;
    size_t rel_entsize;
    size_t no_syms;
    int type, symid;
    static int n_title = 0;
    int ndx = 0;
    char *sym_name;
    int adj = 0;

    if (gelf_getclass(elf_file) == ELFCLASS64)
        adj = 8;

    rel_entsize = p_scns->p_shdr.sh_entsize;
    if ((rel_entsize == 0) ||
        (rel_entsize > p_scns->p_shdr.sh_size)) {
        rel_entsize = gelf_fsize(elf_file, ELF_T_RELA, 1,
            EV_CURRENT);
    }
    no_entries = reloc_size / rel_entsize;

    no_syms = sym_size / gelf_fsize(elf_file, ELF_T_SYM, 1, EV_CURRENT);
    while (no_entries--) {
        (void) gelf_getrela(rdata, ndx, &rela);
        /* LINTED */
        type = (int)GELF_R_TYPE(rela.r_info);
        /* LINTED */
        symid = (int)GELF_R_SYM(rela.r_info);
        /* LINTED */
        if ((symid > (no_syms - 1)) || (symid < 0)) {
            (void) fprintf(stderr, "%s: %s: invalid symbol table "
                "offset - %d - in %s\n", prog_name, filename,
                symid, p_scns->scn_name);
            ndx++;
            continue;
        }
        (void) gelf_getsym(sym_data, symid, &sym);
        sym_name = (char *)elf_strptr(elf_file,
            reloc_symtab->p_shdr.sh_link, sym.st_name);
        if (sym_name == NULL)
            sym_name = (char *)UNKNOWN;
        if (r_flag && rn_flag) {
            if (strcmp(name, p_scns->scn_name) != 0) {
                ndx++;
                continue;
            }
            if (!n_title) {
                (void) printf("\n%s:\n", p_scns->scn_name);
                (void) printf("%-*s%-*s%-*s%s\n\n",
                    12 + adj, "Offset", 22, "Symndx",
                    16, "Type", "Addend");
                n_title = 1;
            }
        }
        if (d_flag) {
            if (!d_hi)
                d_hi = d_low;
            if ((symid < d_low) || (symid > d_hi)) {
                ndx++;
                continue;
            }
        }

        (void) printf("%-#*llx", 12 + adj, EC_XWORD(rela.r_offset));
        if (!v_flag) {
            (void) printf("%-22d%-18d", symid, type);
        } else {
            Conv_inv_buf_t  inv_buf;

            if (strlen(sym_name)) {
                size_t len = strlen(sym_name) + 1;
                char tmpstr[10];
                if (len > 22) {
                    (void) sprintf(tmpstr, "%%-%ds",
                        /* LINTED */
                        (int)len);
                    /*LINTED: E_SEC_PRINTF_VAR_FMT*/
                    (void) printf(tmpstr, sym_name);
                } else
                    (void) printf("%-22s", sym_name);
            } else {
                (void) printf("%-22d", symid);
            }
            (void) printf("%-20s",
                conv_reloc_type(p_ehdr->e_machine,
                type, DUMP_CONVFMT, &inv_buf));
        }
        (void) printf("%lld\n", EC_SXWORD(rela.r_addend));
        ndx++;
    }
}

/*
 * Print relocation data of type SHT_REL.
 * If d_flag, print data corresponding only to
 * the section or range of sections specified.
 * If n_flag, print data corresponding only to
 * the named section.
 */
static void
print_rel(Elf *elf_file, SCNTAB *p_scns, Elf_Data *rdata, Elf_Data *sym_data,
    GElf_Ehdr *p_ehdr, size_t reloc_size, size_t sym_size, char *filename,
    SCNTAB *reloc_symtab)
{
    GElf_Rel rel;
    GElf_Sym sym;
    size_t no_entries;
    size_t rel_entsize;
    int type, symid;
    size_t no_syms;
    static int n_title = 0;
    int ndx = 0;
    char *sym_name;
    int adj = 0;

    if (gelf_getclass(elf_file) == ELFCLASS64)
        adj = 8;

    rel_entsize = p_scns->p_shdr.sh_entsize;
    if ((rel_entsize == 0) ||
        (rel_entsize > p_scns->p_shdr.sh_size)) {
        rel_entsize = gelf_fsize(elf_file, ELF_T_REL, 1,
            EV_CURRENT);
    }
    no_entries = reloc_size / rel_entsize;

    no_syms = sym_size / gelf_fsize(elf_file, ELF_T_SYM, 1, EV_CURRENT);
    while (no_entries--) {
        (void) gelf_getrel(rdata, ndx, &rel);
        /* LINTED */
        type = (int)GELF_R_TYPE(rel.r_info);
        /* LINTED */
        symid = (int)GELF_R_SYM(rel.r_info);
        /* LINTED */
        if ((symid > (no_syms - 1)) || (symid < 0)) {
            (void) fprintf(stderr, "%s: %s: invalid symbol table "
                "offset - %d - in %s\n", prog_name, filename,
                symid, p_scns->scn_name);
            ndx++;
            continue;
        }
        (void) gelf_getsym(sym_data, symid, &sym);
        sym_name = (char *)elf_strptr(elf_file,
            reloc_symtab->p_shdr.sh_link, sym.st_name);
        if (sym_name == NULL)
            sym_name = (char *)UNKNOWN;
        if (r_flag && rn_flag) {
            if (strcmp(name, p_scns->scn_name) != 0) {
                ndx++;
                continue;
            }
            if (!n_title) {
                (void) printf("\n%s:\n", p_scns->scn_name);
                (void) printf("%-*s%-*s%s\n\n",
                    12 + adj, "Offset", 20, "Symndx", "Type");
                n_title = 1;
            }
        }
        if (d_flag) {
            if (!d_hi)
                d_hi = d_low;
            if ((symid < d_low) || (symid > d_hi)) {
                ndx++;
                continue;
            }
        }

        (void) printf("%-#*llx", 12 + adj, EC_ADDR(rel.r_offset));
        if (!v_flag) {
            (void) printf("%-20d%-18d", symid, type);
        } else {
            Conv_inv_buf_t  inv_buf;

            if (strlen(sym_name))
                (void) printf("%-20s", sym_name);
            else {
                (void) printf("%-20d", sym.st_name);
            }
            (void) printf("%-20s",
                conv_reloc_type(p_ehdr->e_machine,
                type, DUMP_CONVFMT, &inv_buf));
        }
        (void) printf("\n");
        ndx++;
    }
}

/* demangle C++ names */
static char *
demangled_name(char *s)
{
    static char *buf = NULL;
    char        *dn;
    size_t      len;

    dn = sgs_demangle(s);

    /*
     * If not demangled, just return the symbol name
     */
    if (strcmp(s, dn) == 0)
        return (s);

    /*
     * Demangled. Format it
     */
    if (buf != NULL)
        free(buf);

    len = strlen(dn) + strlen(s) + 4;
    if ((buf = malloc(len)) == NULL)
        return (s);

    (void) snprintf(buf, len, "%s\t[%s]", dn, s);
    return (buf);
}

/*
 * Print the symbol table.  Input is an ELF file descriptor, a
 * pointer to the symbol table SCNTAB structure,
 * the number of symbols, a range of symbols to print,
 * an index which is the number of the
 * section in the file, and the filename.  The number of sections,
 * the range, and the index are set in
 * dump_symbol_table, depending on whether -n or -T were set.
 */
static void
print_symtab(Elf *elf_file, SCNTAB *p_symtab, Elf_Data *sym_data,
    long range, int index)
{
    GElf_Sym sym;
    int adj = 0;        /* field adjustment for elf64 */
    Elf32_Word  *symshndx = 0;
    unsigned int    nosymshndx = 0;
    Conv_inv_buf_t  inv_buf;


    if (gelf_getclass(elf_file) == ELFCLASS64)
        adj = 8;

    while (range > 0) {
        char        *sym_name = (char *)0;
        int     type, bind;
        int     specsec;
        unsigned int    shndx;

        (void) gelf_getsym(sym_data, index, &sym);
        type = (int)GELF_ST_TYPE(sym.st_info);
        bind = (int)GELF_ST_BIND(sym.st_info);

        if ((sym.st_shndx == SHN_XINDEX) &&
            (symshndx == 0) && (nosymshndx == 0)) {
            Elf_Scn     *_scn;
            GElf_Shdr   _shdr;
            size_t      symscnndx;

            symscnndx = elf_ndxscn(p_symtab->p_sd);
            _scn = 0;
            while ((_scn = elf_nextscn(elf_file, _scn)) != 0) {
                if (gelf_getshdr(_scn, &_shdr) == 0)
                    break;
                if ((_shdr.sh_type == SHT_SYMTAB_SHNDX) &&
                    /* LINTED */
                    (_shdr.sh_link == (GElf_Word)symscnndx)) {
                    Elf_Data    *_data;

                    if ((_data = elf_getdata(_scn, 0)) == 0)
                        continue;

                    symshndx = (Elf32_Word *)_data->d_buf;
                    nosymshndx = 0;
                    break;
                }
            }
            nosymshndx = 1;
        }

        if ((symshndx) && (sym.st_shndx == SHN_XINDEX)) {
            shndx = symshndx[index];
            specsec = 0;
        } else {
            shndx = sym.st_shndx;
            if ((sym.st_shndx == SHN_UNDEF) ||
                (sym.st_shndx >= SHN_LORESERVE))
                specsec = 1;
            else
                specsec = 0;
        }


        (void) printf("[%d]\t ", index++);

        if (v_flag && (type == STT_SPARC_REGISTER)) {
            /*
             *  The strings "REG_G1" through "REG_G7" are intended
             *  to be consistent with output from elfdump(1).
             */
            (void) printf("%-*s", 12 + adj,
                conv_sym_SPARC_value(sym.st_value,
                DUMP_CONVFMT, &inv_buf));
        } else {
            (void) printf("0x%-*llx", 10 + adj,
                EC_ADDR(sym.st_value));
        }

        (void) printf("%-*lld", 9 + adj, EC_XWORD(sym.st_size));

        if (!v_flag) {
            (void) printf("%d\t\t%d\t%d\t%#x\t",
                type, bind, (int)sym.st_other, (int)shndx);
        } else {
            GElf_Ehdr p_ehdr;
            (void) gelf_getehdr(elf_file, &p_ehdr);
            (void) printf("%s\t",
                conv_sym_info_type(p_ehdr.e_machine, type,
                DUMP_CONVFMT, &inv_buf));
            (void) printf("%s",
                conv_sym_info_bind(bind, DUMP_CONVFMT, &inv_buf));
            (void) printf("\t  %d\t", EC_WORD(sym.st_other));

            if (specsec)
                (void) printf("%s",
                    conv_sym_shndx(shndx, &inv_buf));
            else
                (void) printf("%d", EC_WORD(shndx));
            (void) printf("\t");
        }

        /* support machines where NULL-deref causes core dump */
        if (sym.st_name == 0)
            sym_name = (char *)UNKNOWN;
        else
            if (C_flag)
                sym_name = demangled_name(
                    (char *)elf_strptr(elf_file,
                    p_symtab->p_shdr.sh_link,
                    sym.st_name));
        else
            sym_name = (char *)elf_strptr(elf_file,
                p_symtab->p_shdr.sh_link, sym.st_name);
        if (sym_name == NULL)
            sym_name = (char *)UNKNOWN;
        (void) printf("%s\n", sym_name);

        range--;
    }   /* end while */
}

/*
 * Print the section header table.  Input is the SCNTAB structure,
 * the number of sections, an index which is the number of the
 * section in the file, and the filename.  The values of the SCNTAB
 * structure, the number of sections, and the index are set in
 * dump_shdr depending on whether the -n or -d modifiers were set.
 */
static void
print_shdr(Elf *elf_file, SCNTAB *s, int num_scns, int index)
{
    SCNTAB *p;
    int num;
    int field;
    GElf_Ehdr p_ehdr;

    if (gelf_getclass(elf_file) == ELFCLASS64)
        field = 21;
    else
        field = 13;

    p = s;
    (void) gelf_getehdr(elf_file, &p_ehdr);

    for (num = 0; num < num_scns; num++, p++) {
        (void) printf("[%d]\t", index++);
        if (!v_flag) {
            (void) printf("%u\t%llu\t",
                EC_WORD(p->p_shdr.sh_type),
                EC_XWORD(p->p_shdr.sh_flags));
        } else {
            Conv_inv_buf_t inv_buf;

            /*LINTED: E_SEC_PRINTF_VAR_FMT*/
            (void) printf(conv_sec_type(p_ehdr.e_machine,
                p->p_shdr.sh_type, DUMP_CONVFMT, &inv_buf));
            (void) printf("    ");

            if (p->p_shdr.sh_flags & SHF_WRITE)
                (void) printf("W");
            else
                (void) printf("-");
            if (p->p_shdr.sh_flags & SHF_ALLOC)
                (void) printf("A");
            else
                (void) printf("-");
            if (p->p_shdr.sh_flags & SHF_EXECINSTR)
                (void) printf("I");
            else
                (void) printf("-");

            if (p->p_shdr.sh_flags & SHF_ORDERED)
                (void) printf("O");
            if (p->p_shdr.sh_flags & SHF_EXCLUDE)
                (void) printf("E");

            (void) printf("\t");

        }
        (void) printf("%-#*llx%-#*llx%-#*llx%s%s\n",
            field, EC_ADDR(p->p_shdr.sh_addr),
            field, EC_OFF(p->p_shdr.sh_offset),
            field, EC_XWORD(p->p_shdr.sh_size),
            /* compatibility:  tab for elf32 */
            (field == 13) ? "\t" : " ", p->scn_name);

        (void) printf("\t%u\t%u\t%-#*llx%-#*llx\n\n",
            EC_WORD(p->p_shdr.sh_link),
            EC_WORD(p->p_shdr.sh_info),
            field, EC_XWORD(p->p_shdr.sh_addralign),
            field, EC_XWORD(p->p_shdr.sh_entsize));
    }
}

/*
 * Check that a range of numbers is valid.  Input is
 * a lower bound, an upper bound, a boundary condition,
 * and the filename.  Negative numbers and numbers greater
 * than the bound are invalid.  low must be smaller than hi.
 * The returned integer is the number of items in the
 * range if it is valid and -1 otherwise.
 */
static int
check_range(int low, int hi, size_t bound, char *filename)
{
    if (((size_t)low > bound) || (low <= 0)) {
        (void) fprintf(stderr,
            "%s: %s: number out of range, %d\n",
            prog_name, filename, low);
        return (-1);
    }
    if (((size_t)hi > bound) || (hi < 0)) {
        (void) fprintf(stderr,
            "%s: %s: number out of range, %d\n",
            prog_name, filename, hi);
        return (-1);
    }

    if (hi && (low > hi)) {
        (void) fprintf(stderr,
            "%s: %s: invalid range, %d,%d\n",
            prog_name, filename, low, hi);
        return (-1);
    }
    if (hi)
        return (hi - low + 1);
    else
        return (1);
}

/*
 * Print relocation information.  Since this information is
 * machine dependent, new sections must be added for each machine
 * that is supported.  Input is an ELF file descriptor, the ELF header,
 * the SCNTAB structure, the number of sections, and a filename.
 * Set up necessary information to print relocation information
 * and call the appropriate print function depending on the
 * type of relocation information.  If the symbol table is
 * absent, no relocation data is processed.  Input is an
 * ELF file descriptor, the ELF header, the SCNTAB structure,
 * and the filename.  Set range of d_flag and name if n_flag.
 */
static void
dump_reloc_table(Elf *elf_file, GElf_Ehdr *p_ehdr,
    SCNTAB *p_scns, int num_scns, char *filename)
{
    Elf_Data *rel_data;
    Elf_Data *sym_data;
    size_t    sym_size;
    size_t    reloc_size;
    SCNTAB *reloc_symtab;
    SCNTAB *head_scns;
    int r_title = 0;
    int adj = 0;
    size_t shnum;

    if (gelf_getclass(elf_file) == ELFCLASS64)
        adj = 8;

    if ((!p_flag) && (!r_title)) {
        (void) printf("\n    **** RELOCATION INFORMATION ****\n");
        r_title = 1;
    }

    while (num_scns-- > 0) {
        if ((p_scns->p_shdr.sh_type != SHT_RELA) &&
            (p_scns->p_shdr.sh_type != SHT_REL)) {
            p_scns++;
            continue;
        }

    head_scns = p_head_scns;

    if (elf_getshnum(elf_file, &shnum) == 0) {
        (void) fprintf(stderr,
            "%s: %s: elf_getshnum failed: %s\n",
            prog_name, filename, elf_errmsg(-1));
        return;
    }

    if ((p_scns->p_shdr.sh_link == 0) ||
        /* LINTED */
        (p_scns->p_shdr.sh_link >= (GElf_Word)shnum)) {
        (void) fprintf(stderr, "%s: %s: invalid sh_link field: "
            "section #: %d sh_link: %d\n",
            /* LINTED */
            prog_name, filename, (int)elf_ndxscn(p_scns->p_sd),
            (int)p_scns->p_shdr.sh_link);
        return;
    }
    head_scns += (p_scns->p_shdr.sh_link -1);

    if (head_scns->p_shdr.sh_type == SHT_SYMTAB) {
        reloc_symtab = p_symtab;
    } else if (head_scns->p_shdr.sh_type  == SHT_DYNSYM) {
        reloc_symtab = p_dynsym;
    } else {
        (void) fprintf(stderr,
"%s: %s: could not get symbol table\n", prog_name, filename);
        return;
    }

    sym_data = NULL;
    sym_size = 0;
    reloc_size = 0;

    if ((sym_data = elf_getdata(reloc_symtab->p_sd, NULL)) == NULL) {
        (void) fprintf(stderr,
        "%s: %s: no symbol table data\n", prog_name, filename);
        return;
    }
    sym_size = sym_data->d_size;

    if (p_scns == NULL) {
        (void) fprintf(stderr,
        "%s: %s: no section table data\n", prog_name, filename);
        return;
    }

    if (p_scns->p_shdr.sh_type == SHT_RELA) {
        if (!n_flag && r_flag)
            (void) printf("\n%s:\n", p_scns->scn_name);
        if (!p_flag && (!n_flag && r_flag))
            (void) printf("%-*s%-*s%-*s%s\n\n",
                12 + adj, "Offset", 22, "Symndx",
                18, "Type", "Addend");
        if ((rel_data = elf_getdata(p_scns->p_sd, NULL)) == NULL) {
            (void) fprintf(stderr,
"%s: %s: no relocation information\n", prog_name, filename);
            return;
        }
        reloc_size = rel_data->d_size;

        if (n_flag) {
            rn_flag = 1;
            print_rela(elf_file, p_scns, rel_data, sym_data, p_ehdr,
                reloc_size, sym_size, filename, reloc_symtab);
        }
        if (d_flag) {
            rn_flag = 0;
            print_rela(elf_file, p_scns, rel_data, sym_data, p_ehdr,
                reloc_size, sym_size, filename, reloc_symtab);
        }
        if (!n_flag && !d_flag)
            print_rela(elf_file, p_scns, rel_data, sym_data, p_ehdr,
                reloc_size, sym_size, filename, reloc_symtab);
    } else {
        if (p_scns->p_shdr.sh_type == SHT_REL) {
            if (!n_flag && r_flag)
                (void) printf("\n%s:\n", p_scns->scn_name);
            if (!p_flag && (!n_flag && r_flag)) {
                (void) printf("%-*s%-*s%s\n\n",
                    12 + adj, "Offset", 20, "Symndx", "Type");
            }
            if ((rel_data = elf_getdata(p_scns->p_sd, NULL))
                == NULL) {
                (void) fprintf(stderr,
"%s: %s: no relocation information\n", prog_name, filename);
                return;
            }
            reloc_size = rel_data->d_size;
            if (n_flag) {
                rn_flag = 1;
                print_rel(elf_file, p_scns, rel_data, sym_data,
                    p_ehdr, reloc_size, sym_size,
                    filename, reloc_symtab);
            }
            if (d_flag) {
                rn_flag = 0;
                print_rel(elf_file, p_scns, rel_data, sym_data,
                    p_ehdr, reloc_size, sym_size,
                    filename, reloc_symtab);
            }
            if (!n_flag && !d_flag)
                print_rel(elf_file, p_scns, rel_data, sym_data,
                    p_ehdr, reloc_size, sym_size,
                    filename, reloc_symtab);
        }
    }
    p_scns++;
    }
}

/*
 * Print out the string tables.  Input is an opened ELF file,
 * the SCNTAB structure, the number of sections, and the filename.
 * Since there can be more than one string table, all sections are
 * examined and any with the correct type are printed out.
 */
static void
dump_string_table(SCNTAB *s, int num_scns)
{
    size_t section_size;
    unsigned char *strtab;
    int beg_of_string;
    int counter = 0;
    int str_off;
    int i;

    if (!p_flag) {
        (void) printf("\n     **** STRING TABLE INFORMATION ****\n");
    }

    for (i = 0; i < num_scns; i++, s++) {
        if (s->p_shdr.sh_type != SHT_STRTAB)
            continue;

        str_off = 0;

        if (!p_flag) {
            (void) printf("\n%s:\n", s->scn_name);
            (void) printf("   <offset>  \tName\n");
        }
        section_size = 0;
        if ((strtab = (unsigned char *)
            get_scndata(s->p_sd, &section_size)) == NULL) {
            continue;
        }

        if (section_size != 0) {
            (void) printf("   <%d>  \t", str_off);
            beg_of_string = 0;
            while (section_size--) {
                unsigned char c = *strtab++;

                if (beg_of_string) {
                    (void) printf("   <%d>  \t", str_off);
                    counter++;
                    beg_of_string = 0;
                }
                str_off++;
                switch (c) {
                case '\0':
                    (void) printf("\n");
                    beg_of_string = 1;
                    break;
                default:
                    (void) putchar(c);
                }
            }
        }
    }
    (void) printf("\n");
}

/*
 * Print the symbol table.  This function does not print the contents
 * of the symbol table but sets up the parameters and then calls
 * print_symtab to print the symbols.  Calling another function to print
 * the symbols allows both -T and -n to work correctly
 * simultaneously.  Input is an opened ELF file, a pointer to the
 * symbol table SCNTAB structure, and the filename.
 * Set the range of symbols to print if T_flag, and set
 * name of symbol to print if n_flag.
 */
static void
dump_symbol_table(Elf *elf_file, SCNTAB *p_symtab, char *filename)
{
    Elf_Data  *sym_data;
    GElf_Sym  T_range, n_range; /* for use with -T and -n */
    size_t count = 0;
    size_t sym_size;
    int index = 1;
    int found_it = 0;
    int i;
    int adj = 0;            /*  field adjustment for elf64 */

    if (gelf_getclass(elf_file) == ELFCLASS64)
        adj = 8;

    if (p_symtab == NULL) {
        (void) fprintf(stderr,
        "%s: %s: could not get symbol table\n", prog_name, filename);
        return;
    }

    /* get symbol table data */
    sym_data = NULL;
    sym_size = 0;
    if ((sym_data =
        elf_getdata(p_symtab->p_sd, NULL)) == NULL) {
        (void) printf("\n%s:\n", p_symtab->scn_name);
        (void) printf("No symbol table data\n");
        return;
    }
    sym_size = sym_data->d_size;

    count = sym_size / p_symtab->p_shdr.sh_entsize;

    if (n_flag && t_flag && !T_flag) {
        /* LINTED */
        for (i = 1; i < count; i++) {
            (void) gelf_getsym(sym_data, i, &n_range);
            if (strcmp(name, (char *)
                elf_strptr(elf_file,
                p_symtab->p_shdr.sh_link,
                n_range.st_name)) != 0) {
                continue;
            } else {
                found_it = 1;
                if (!p_flag) {
                    (void) printf(
"\n              ***** SYMBOL TABLE INFORMATION *****\n");
                    (void) printf(
"[Index]  %-*s%-*sType\tBind\tOther\tShndx\tName",
                        12 + adj, "Value", 9 + adj, "Size");
                }
                (void) printf("\n%s:\n", p_symtab->scn_name);
                print_symtab(elf_file, p_symtab, sym_data,
                    1, i);
            }
        }   /* end for */
        if (!found_it) {
            (void) fprintf(stderr, "%s: %s: %s not found\n",
                prog_name, filename, name);
        }
    } else if (T_flag) {
        T_num = check_range(T_low, T_hi, count, filename);
        if (T_num < 0)
            return;

        (void) gelf_getsym(sym_data, T_low-1, &T_range);
        index = T_low;

        if (!p_flag) {
            (void) printf(
"\n              ***** SYMBOL TABLE INFORMATION *****\n");
            (void) printf(
"[Index]  %-*s%-*sType\tBind\tOther\tShndx\tName",
                12 + adj, "Value", 9 + adj, "Size");
        }
        (void) printf("\n%s:\n", p_symtab->scn_name);
        print_symtab(elf_file, p_symtab, sym_data, T_num, index);
    } else {
        if (!p_flag) {
            (void) printf(
"\n              ***** SYMBOL TABLE INFORMATION *****\n");
            (void) printf(
"[Index]  %-*s%-*sType\tBind\tOther\tShndx\tName",
                12 + adj, "Value", 9 + adj, "Size");
        }
        (void) printf("\n%s:\n", p_symtab->scn_name);
        print_symtab(elf_file, p_symtab, sym_data, count-1, 1);
    }
}


/*
 * Print dynamic linking information.  Input is an ELF
 * file descriptor, the SCNTAB structure, the number of
 * sections, and the filename.
 */
static void
dump_dynamic(Elf *elf_file, SCNTAB *p_scns, int num_scns, char *filename)
{
#define pdyn_Fmtptr "%#llx"

    Elf_Data    *dyn_data;
    GElf_Dyn    p_dyn;
    GElf_Phdr   p_phdr;
    GElf_Ehdr   p_ehdr;
    int     index = 1;
    int     lib_scns = num_scns;
    SCNTAB      *l_scns = p_scns;
    int     header_num = 0;
    const char  *str;

    (void) gelf_getehdr(elf_file, &p_ehdr);

    if (!p_flag)
        (void) printf("\n  **** DYNAMIC SECTION INFORMATION ****\n");

    for (; num_scns > 0; num_scns--, p_scns++) {
        GElf_Word   link;
        int     ii;


        if (p_scns->p_shdr.sh_type != SHT_DYNAMIC)
            continue;

        if (!p_flag) {
            (void) printf("%s:\n", p_scns->scn_name);
            (void) printf("[INDEX]\tTag         Value\n");
        }

        if ((dyn_data = elf_getdata(p_scns->p_sd, NULL)) == 0) {
            (void) fprintf(stderr, "%s: %s: no data in "
                "%s section\n", prog_name, filename,
                p_scns->scn_name);
            return;
        }

        link = p_scns->p_shdr.sh_link;
        ii = 0;

        (void) gelf_getdyn(dyn_data, ii++, &p_dyn);
        while (p_dyn.d_tag != DT_NULL) {
            union {
                Conv_inv_buf_t      inv;
                Conv_dyn_flag_buf_t dyn_flag;
                Conv_dyn_flag1_buf_t    dyn_flag1;
                Conv_dyn_feature1_buf_t dyn_feature1;
                Conv_dyn_posflag1_buf_t dyn_posflag1;
            } conv_buf;

            (void) printf("[%d]\t%-15.15s ", index++,
                conv_dyn_tag(p_dyn.d_tag, p_ehdr.e_machine,
                DUMP_CONVFMT, &conv_buf.inv));

            /*
             * It would be nice to use a table driven loop
             * here, but the address space is too sparse
             * and irregular. A switch is simple and robust.
             */
            switch (p_dyn.d_tag) {
            /*
             * Items with an address value
             */
            case DT_PLTGOT:
            case DT_HASH:
            case DT_STRTAB:
            case DT_RELA:
            case DT_SYMTAB:
            case DT_INIT:
            case DT_FINI:
            case DT_REL:
            case DT_DEBUG:
            case DT_TEXTREL:
            case DT_JMPREL:
            case DT_INIT_ARRAY:
            case DT_FINI_ARRAY:
            case DT_INIT_ARRAYSZ:
            case DT_FINI_ARRAYSZ:
            case DT_PREINIT_ARRAY:
            case DT_PREINIT_ARRAYSZ:
            case DT_SUNW_RTLDINF:
            case DT_SUNW_CAP:
            case DT_SUNW_SYMTAB:
            case DT_SUNW_SYMSORT:
            case DT_SUNW_TLSSORT:
            case DT_PLTPAD:
            case DT_MOVETAB:
            case DT_SYMINFO:
            case DT_RELACOUNT:
            case DT_RELCOUNT:
            case DT_VERSYM:
            case DT_VERDEF:
            case DT_VERDEFNUM:
            case DT_VERNEED:
                (void) printf(pdyn_Fmtptr,
                    EC_ADDR(p_dyn.d_un.d_ptr));
                break;

            /*
             * Items with a string value
             */
            case DT_NEEDED:
            case DT_SONAME:
            case DT_RPATH:
            case DT_RUNPATH:
            case DT_SUNW_AUXILIARY:
            case DT_SUNW_FILTER:
            case DT_CONFIG:
            case DT_DEPAUDIT:
            case DT_AUDIT:
            case DT_AUXILIARY:
            case DT_USED:
            case DT_FILTER:
                if (v_flag) {   /* Look up the string */
                    str = (char *)elf_strptr(elf_file, link,
                        p_dyn.d_un.d_ptr);
                    if (!(str && *str))
                        str = (char *)UNKNOWN;
                    (void) printf("%s", str);
                } else {    /* Show the address */
                    (void) printf(pdyn_Fmtptr,
                        EC_ADDR(p_dyn.d_un.d_ptr));
                }
                break;

            /*
             * Items with a literal value
             */
            case DT_PLTRELSZ:
            case DT_RELASZ:
            case DT_RELAENT:
            case DT_STRSZ:
            case DT_SYMENT:
            case DT_RELSZ:
            case DT_RELENT:
            case DT_PLTREL:
            case DT_BIND_NOW:
            case DT_CHECKSUM:
            case DT_PLTPADSZ:
            case DT_MOVEENT:
            case DT_MOVESZ:
            case DT_SYMINSZ:
            case DT_SYMINENT:
            case DT_VERNEEDNUM:
            case DT_SPARC_REGISTER:
            case DT_SUNW_SYMSZ:
            case DT_SUNW_SORTENT:
            case DT_SUNW_SYMSORTSZ:
            case DT_SUNW_TLSSORTSZ:
            case DT_SUNW_STRPAD:
                (void) printf(pdyn_Fmtptr,
                    EC_XWORD(p_dyn.d_un.d_val));
                break;

            /*
             * Integer items that are bitmasks, or which
             * can be otherwise formatted in symbolic form.
             */
            case DT_FLAGS:
            case DT_FEATURE_1:
            case DT_POSFLAG_1:
            case DT_FLAGS_1:
            case DT_SUNW_LDMACH:
                str = NULL;
                if (v_flag) {
                    switch (p_dyn.d_tag) {
                    case DT_FLAGS:
                        str = conv_dyn_flag(
                            p_dyn.d_un.d_val,
                            DUMP_CONVFMT,
                            &conv_buf.dyn_flag);
                        break;
                    case DT_FEATURE_1:
                        str = conv_dyn_feature1(
                            p_dyn.d_un.d_val,
                            DUMP_CONVFMT,
                            &conv_buf.dyn_feature1);
                        break;
                    case DT_POSFLAG_1:
                        str = conv_dyn_posflag1(
                            p_dyn.d_un.d_val,
                            DUMP_CONVFMT,
                            &conv_buf.dyn_posflag1);
                        break;
                    case DT_FLAGS_1:
                        str = conv_dyn_flag1(
                            p_dyn.d_un.d_val, 0,
                            &conv_buf.dyn_flag1);
                        break;
                    case DT_SUNW_LDMACH:
                        str = conv_ehdr_mach(
                            p_dyn.d_un.d_val, 0,
                            &conv_buf.inv);
                        break;
                    }
                }
                if (str) {  /* Show as string */
                    (void) printf("%s", str);
                } else {    /* Numeric form */
                    (void) printf(pdyn_Fmtptr,
                        EC_ADDR(p_dyn.d_un.d_ptr));
                }
                break;

            /*
             * Depreciated items with a literal value
             */
            case DT_DEPRECATED_SPARC_REGISTER:
                (void) printf(pdyn_Fmtptr
                    "  (deprecated value)",
                    EC_XWORD(p_dyn.d_un.d_val));
                break;

            /* Ignored items */
            case DT_SYMBOLIC:
                (void) printf("(ignored)");
                break;
            }
            (void) printf("\n");
            (void) gelf_getdyn(dyn_data, ii++, &p_dyn);
        }
    }

    /*
     * Check for existence of static shared library information.
     */
    while (header_num < p_ehdr.e_phnum) {
        (void) gelf_getphdr(elf_file, header_num, &p_phdr);
        if (p_phdr.p_type == PT_SHLIB) {
            while (--lib_scns > 0) {
                if (strcmp(l_scns->scn_name, ".lib") == 0) {
                    print_static(l_scns, filename);
                }
                l_scns++;
            }
        }
        header_num++;
    }
#undef  pdyn_Fmtptr
}

/*
 * Print the ELF header.  Input is an ELF file descriptor
 * and the filename.  If f_flag is set, the ELF header is
 * printed to stdout, otherwise the function returns after
 * setting the pointer to the ELF header.  Any values which
 * are not known are printed in decimal.  Fields must be updated
 * as new values are added.
 */
static GElf_Ehdr *
dump_elf_header(Elf *elf_file, char *filename, GElf_Ehdr * elf_head_p)
{
    int class;
    int field;

    if (gelf_getehdr(elf_file, elf_head_p) == NULL) {
        (void) fprintf(stderr, "%s: %s: %s\n", prog_name, filename,
            elf_errmsg(-1));
        return (NULL);
    }

    class = (int)elf_head_p->e_ident[4];

    if (class == ELFCLASS64)
        field = 21;
    else
        field = 13;

    if (!f_flag)
        return (elf_head_p);

    if (!p_flag) {
        (void) printf("\n                    **** ELF HEADER ****\n");
        (void) printf("%-*s%-11s%-*sMachine     Version\n",
            field, "Class", "Data", field, "Type");
        (void) printf("%-*s%-11s%-*sFlags       Ehsize\n",
            field, "Entry", "Phoff", field, "Shoff");
        (void) printf("%-*s%-11s%-*sShnum       Shstrndx\n\n",
            field, "Phentsize", "Phnum", field, "Shentsz");
    }

    if (!v_flag) {
        (void) printf("%-*d%-11d%-*d%-12d%d\n",
            field, elf_head_p->e_ident[4], elf_head_p->e_ident[5],
            field, (int)elf_head_p->e_type, (int)elf_head_p->e_machine,
            elf_head_p->e_version);
    } else {
        Conv_inv_buf_t  inv_buf;

        (void) printf("%-*s", field,
            conv_ehdr_class(class, DUMP_CONVFMT, &inv_buf));
        (void) printf("%-11s",
            conv_ehdr_data(elf_head_p->e_ident[5], DUMP_CONVFMT,
            &inv_buf));
        (void) printf("%-*s", field,
            conv_ehdr_type(elf_head_p->e_type, DUMP_CONVFMT, &inv_buf));
        (void) printf("%-12s",
            conv_ehdr_mach(elf_head_p->e_machine, DUMP_CONVFMT,
            &inv_buf));
        (void) printf("%s\n",
            conv_ehdr_vers(elf_head_p->e_version, DUMP_CONVFMT,
            &inv_buf));
    }
    (void) printf("%-#*llx%-#11llx%-#*llx%-#12x%#x\n",
        field, EC_ADDR(elf_head_p->e_entry), EC_OFF(elf_head_p->e_phoff),
        field, EC_OFF(elf_head_p->e_shoff), EC_WORD(elf_head_p->e_flags),
        EC_WORD(elf_head_p->e_ehsize));
    if (!v_flag || (elf_head_p->e_shstrndx != SHN_XINDEX)) {
        (void) printf("%-#*x%-11u%-#*x%-12u%u\n",
            field, EC_WORD(elf_head_p->e_phentsize),
            EC_WORD(elf_head_p->e_phnum),
            field, EC_WORD(elf_head_p->e_shentsize),
            EC_WORD(elf_head_p->e_shnum),
            EC_WORD(elf_head_p->e_shstrndx));
    } else {
        (void) printf("%-#*x%-11u%-#*x%-12uXINDEX\n",
            field, EC_WORD(elf_head_p->e_phentsize),
            EC_WORD(elf_head_p->e_phnum),
            field, EC_WORD(elf_head_p->e_shentsize),
            EC_WORD(elf_head_p->e_shnum));
    }
    if ((elf_head_p->e_shnum == 0) && (elf_head_p->e_shoff > 0)) {
        Elf_Scn     *scn;
        GElf_Shdr   shdr0;
        int     field;

        if (gelf_getclass(elf_file) == ELFCLASS64)
            field = 21;
        else
            field = 13;
        if (!p_flag) {
            (void) printf("\n      **** SECTION HEADER[0] "
                "{Elf Extensions} ****\n");
            (void) printf(
                "[No]\tType\tFlags\t%-*s %-*s%-*s%sName\n",
                field, "Addr", field, "Offset", field,
                "Size(shnum)",
                /* compatibility:  tab for elf32 */
                (field == 13) ? "\t" : "  ");
            (void) printf("\tLn(strndx) Info\t%-*s Entsize\n",
                field, "Adralgn");
        }
        if ((scn = elf_getscn(elf_file, 0)) == NULL) {
            (void) fprintf(stderr,
                "%s: %s: elf_getscn failed: %s\n",
                prog_name, filename, elf_errmsg(-1));
            return (NULL);
        }
        if (gelf_getshdr(scn, &shdr0) == 0) {
            (void) fprintf(stderr,
                "%s: %s: gelf_getshdr: %s\n",
                prog_name, filename, elf_errmsg(-1));
            return (NULL);
        }
        (void) printf("[0]\t%u\t%llu\t", EC_WORD(shdr0.sh_type),
            EC_XWORD(shdr0.sh_flags));

        (void) printf("%-#*llx %-#*llx%-*llu%s%-*u\n",
            field, EC_ADDR(shdr0.sh_addr),
            field, EC_OFF(shdr0.sh_offset),
            field, EC_XWORD(shdr0.sh_size),
            /* compatibility:  tab for elf32 */
            ((field == 13) ? "\t" : "  "),
            field, EC_WORD(shdr0.sh_name));

        (void) printf("\t%u\t%u\t%-#*llx %-#*llx\n",
            EC_WORD(shdr0.sh_link),
            EC_WORD(shdr0.sh_info),
            field, EC_XWORD(shdr0.sh_addralign),
            field, EC_XWORD(shdr0.sh_entsize));
    }
    (void) printf("\n");

    return (elf_head_p);
}

/*
 * Print section contents.  Input is an ELF file descriptor,
 * the ELF header, the SCNTAB structure,
 * the number of symbols, and the filename.
 * The number of sections,
 * and the offset into the SCNTAB structure will be
 * set in dump_section if d_flag or n_flag are set.
 * If v_flag is set, sections which can be interpreted will
 * be interpreted, otherwise raw data will be output in hexidecimal.
 */
static void
print_section(Elf *elf_file,
    GElf_Ehdr *p_ehdr, SCNTAB *p, int num_scns, char *filename)
{
    unsigned char    *p_sec;
    int i;
    size_t  size;

    for (i = 0; i < num_scns; i++, p++) {
        GElf_Shdr shdr;

        size = 0;
        if (s_flag && !v_flag)
            p_sec = (unsigned char *)get_rawscn(p->p_sd, &size);
        else
            p_sec = (unsigned char *)get_scndata(p->p_sd, &size);

        if ((gelf_getshdr(p->p_sd, &shdr) != NULL) &&
            (shdr.sh_type == SHT_NOBITS)) {
            continue;
        }
        if (s_flag && !v_flag) {
            (void) printf("\n%s:\n", p->scn_name);
            print_rawdata(p_sec, size);
            continue;
        }
        if (shdr.sh_type == SHT_SYMTAB) {
            dump_symbol_table(elf_file, p, filename);
            continue;
        }
        if (shdr.sh_type == SHT_DYNSYM) {
            dump_symbol_table(elf_file, p, filename);
            continue;
        }
        if (shdr.sh_type == SHT_STRTAB) {
            dump_string_table(p, 1);
            continue;
        }
        if (shdr.sh_type == SHT_RELA) {
            dump_reloc_table(elf_file, p_ehdr, p, 1, filename);
            continue;
        }
        if (shdr.sh_type == SHT_REL) {
            dump_reloc_table(elf_file, p_ehdr, p, 1, filename);
            continue;
        }
        if (shdr.sh_type == SHT_DYNAMIC) {
            dump_dynamic(elf_file, p, 1, filename);
            continue;
        }

        (void) printf("\n%s:\n", p->scn_name);
        print_rawdata(p_sec, size);
    }
    (void) printf("\n");
}

/*
 * Print section contents. This function does not print the contents
 * of the sections but sets up the parameters and then calls
 * print_section to print the contents.  Calling another function to print
 * the contents allows both -d and -n to work correctly
 * simultaneously. Input is an ELF file descriptor, the ELF header,
 * the SCNTAB structure, the number of sections, and the filename.
 * Set the range of sections if d_flag, and set section name if
 * n_flag.
 */
static void
dump_section(Elf *elf_file,
    GElf_Ehdr *p_ehdr, SCNTAB *s, int num_scns, char *filename)
{
    SCNTAB *n_range, *d_range; /* for use with -n and -d modifiers */
    int i;
    int found_it = 0;  /* for use with -n section_name */

    if (n_flag) {
        n_range = s;

        for (i = 0; i < num_scns; i++, n_range++) {
            if ((strcmp(name, n_range->scn_name)) != 0)
                continue;
            else {
                found_it = 1;
                print_section(elf_file, p_ehdr,
                    n_range, 1, filename);
            }
        }

        if (!found_it) {
            (void) fprintf(stderr, "%s: %s: %s not found\n",
                prog_name, filename, name);
        }
    } /* end n_flag */

    if (d_flag) {
        d_range = s;
        d_num = check_range(d_low, d_hi, num_scns, filename);
        if (d_num < 0)
            return;
        d_range += d_low - 1;

        print_section(elf_file, p_ehdr, d_range, d_num, filename);
    }   /* end d_flag */

    if (!n_flag && !d_flag)
        print_section(elf_file, p_ehdr, s, num_scns, filename);
}

/*
 * Print the section header table. This function does not print the contents
 * of the section headers but sets up the parameters and then calls
 * print_shdr to print the contents.  Calling another function to print
 * the contents allows both -d and -n to work correctly
 * simultaneously.  Input is the SCNTAB structure,
 * the number of sections from the ELF header, and the filename.
 * Set the range of section headers to print if d_flag, and set
 * name of section header to print if n_flag.
 */
static void
dump_shdr(Elf *elf_file, SCNTAB *s, int num_scns, char *filename)
{

    SCNTAB *n_range, *d_range;  /* for use with -n and -d modifiers */
    int field;
    int i;
    int found_it = 0;  /* for use with -n section_name */

    if (gelf_getclass(elf_file) == ELFCLASS64)
        field = 21;
    else
        field = 13;

    if (!p_flag) {
        (void) printf("\n      **** SECTION HEADER TABLE ****\n");
        (void) printf("[No]\tType\tFlags\t%-*s %-*s %-*s%sName\n",
            field, "Addr", field, "Offset", field, "Size",
            /* compatibility:  tab for elf32 */
            (field == 13) ? "\t" : "  ");
        (void) printf("\tLink\tInfo\t%-*s Entsize\n\n",
            field, "Adralgn");
    }

    if (n_flag) {
        n_range = s;

        for (i = 1; i <= num_scns; i++, n_range++) {
            if ((strcmp(name, n_range->scn_name)) != 0)
                continue;
            else {
                found_it = 1;
                print_shdr(elf_file, n_range, 1, i);
            }
        }

        if (!found_it) {
            (void) fprintf(stderr, "%s: %s: %s not found\n",
                prog_name, filename, name);
        }
    } /* end n_flag */

    if (d_flag) {
        d_range = s;
        d_num = check_range(d_low, d_hi, num_scns, filename);
        if (d_num < 0)
            return;
        d_range += d_low - 1;

        print_shdr(elf_file, d_range, d_num, d_low);
    }   /* end d_flag */

    if (!n_flag && !d_flag)
        print_shdr(elf_file, s, num_scns, 1);
}

/*
 * Process all of the command line options (except
 * for -a, -g, -f, and -o).  All of the options processed
 * by this function require the presence of the section
 * header table and will not be processed if it is not present.
 * Set up a buffer containing section name, section header,
 * and section descriptor for each section in the file.  This
 * structure is used to avoid duplicate calls to libelf functions.
 * Structure members for the symbol table, the debugging information,
 * and the line number information are global.  All of the
 * rest are local.
 */
static void
dump_section_table(Elf *elf_file, GElf_Ehdr *elf_head_p, char *filename)
{

    static SCNTAB   *buffer, *p_scns;
    Elf_Scn     *scn = 0;
    char        *s_name = NULL;
    int     found = 0;
    unsigned int    num_scns;
    size_t      shstrndx;
    size_t      shnum;


    if (elf_getshnum(elf_file, &shnum) == 0) {
        (void) fprintf(stderr,
            "%s: %s: elf_getshnum failed: %s\n",
            prog_name, filename, elf_errmsg(-1));
        return;
    }
    if (elf_getshstrndx(elf_file, &shstrndx) == 0) {
        (void) fprintf(stderr,
            "%s: %s: elf_getshstrndx failed: %s\n",
            prog_name, filename, elf_errmsg(-1));
        return;
    }

    if ((buffer = calloc(shnum, sizeof (SCNTAB))) == NULL) {
        (void) fprintf(stderr, "%s: %s: cannot calloc space\n",
            prog_name, filename);
        return;
    }
    /* LINTED */
    num_scns = (int)shnum - 1;

    p_symtab = (SCNTAB *)0;
    p_dynsym = (SCNTAB *)0;
    p_scns = buffer;
    p_head_scns = buffer;

    while ((scn = elf_nextscn(elf_file, scn)) != 0) {
        if ((gelf_getshdr(scn, &buffer->p_shdr)) == 0) {
            (void) fprintf(stderr,
                "%s: %s: %s\n", prog_name, filename,
                elf_errmsg(-1));
            return;
        }
        s_name = (char *)
            elf_strptr(elf_file, shstrndx, buffer->p_shdr.sh_name);
        buffer->scn_name = s_name ? s_name : (char *)UNKNOWN;
        buffer->p_sd   =  scn;

        if (buffer->p_shdr.sh_type == SHT_SYMTAB) {
            found += 1;
            p_symtab = buffer;
        }
        if (buffer->p_shdr.sh_type == SHT_DYNSYM)
            p_dynsym = buffer;
        buffer++;
    }

    /*
     * These functions depend upon the presence of the section header table
     * and will not be invoked in its absence
     */
    if (h_flag) {
        dump_shdr(elf_file, p_scns, num_scns, filename);
    }
    if (p_symtab && (t_flag || T_flag)) {
        dump_symbol_table(elf_file, p_symtab, filename);
    }
    if (c_flag) {
        dump_string_table(p_scns, num_scns);
    }
    if (r_flag) {
        dump_reloc_table(elf_file, elf_head_p,
            p_scns, num_scns, filename);
    }
    if (L_flag) {
        dump_dynamic(elf_file, p_scns, num_scns, filename);
    }
    if (s_flag) {
        dump_section(elf_file, elf_head_p, p_scns,
            num_scns, filename);
    }
}

/*
 * Load the archive string table(s) (for extended-length strings)
 * into an in-core table/list
 */
static struct stab_list_s *
load_arstring_table(struct stab_list_s *STabList,
    int fd, Elf *elf_file, Elf_Arhdr *p_ar, char *filename)
{
    off_t here;
    struct stab_list_s *STL_entry, *STL_next;

    if (p_ar) {
        STL_entry = malloc(sizeof (struct stab_list_s));
        STL_entry->next    = 0;
        STL_entry->strings = 0;
        STL_entry->size    = 0;

        if (!STabList)
            STabList = STL_entry;
        else {
            STL_next = STabList;
            while (STL_next->next != (void *)0)
                STL_next = STL_next->next;
            STL_next->next = STL_entry;
        }

        STL_entry->size    = p_ar->ar_size;
        STL_entry->strings = malloc(p_ar->ar_size);
        here = elf_getbase(elf_file);
        if ((lseek(fd, here, 0)) != here) {
            (void) fprintf(stderr,
                "%s: %s: could not lseek\n", prog_name, filename);
        }

        if ((read(fd, STL_entry->strings, p_ar->ar_size)) == -1) {
            (void) fprintf(stderr,
                "%s: %s: could not read\n", prog_name, filename);
        }
    }
    return (STabList);
}

/*
 * Print the archive header for each member of an archive.
 * Also call ar_sym_read to print the symbols in the
 * archive symbol table if g_flag.  Input is a file descriptor,
 * an ELF file descriptor, and the filename.  Putting the call
 * to dump the archive symbol table in this function is more
 * efficient since it is necessary to examine the archive member
 * name in the archive header to determine which member is the
 * symbol table.
 */
static void
dump_ar_hdr(int fd, Elf *elf_file, char *filename)
{
    extern int v_flag, g_flag, a_flag, p_flag;
    Elf_Arhdr  *p_ar;
    Elf *arf;
    Elf_Cmd cmd;
    int title = 0;
    int err = 0;

    char buf[DATESIZE];

    cmd = ELF_C_READ;
    while ((arf = elf_begin(fd, cmd, elf_file)) != 0) {
        p_ar = elf_getarhdr(arf);
        if (p_ar == NULL) {
            (void) fprintf(stderr,
                "%s: %s: %s\n", prog_name, filename,
                elf_errmsg(-1));
            continue;
        }
        if (strcmp(p_ar->ar_name, "/") == 0) {
            if (g_flag)
                ar_sym_read(elf_file, filename);
        } else if (strcmp(p_ar->ar_name, "//") == 0) {
            StringTableList = load_arstring_table(
                StringTableList, fd, arf, p_ar, filename);
            cmd = elf_next(arf);
            (void) elf_end(arf);
            continue;
        } else {
            if (a_flag) {
                (void) printf("%s[%s]:\n", filename,
                    p_ar->ar_name);
                if (!p_flag && title == 0) {
                    if (!v_flag)
                        (void) printf(
"\n\n\t\t\t***ARCHIVE HEADER***"
"\n Date          Uid     Gid    Mode      Size  Member Name\n\n");
                    else
                        (void) printf(
"\n\n\t\t\t***ARCHIVE HEADER***"
"\n Date                   Uid    Gid   Mode     Size     Member Name\n\n");
                    title = 1;
                }
                if (!v_flag) {
                    (void) printf(
"\t0x%.8lx  %6d  %6d  0%.6ho  0x%.8lx  %-s\n\n",
                        p_ar->ar_date, (int)p_ar->ar_uid,
                        (int)p_ar->ar_gid,
                        (int)p_ar->ar_mode,
                        p_ar->ar_size, p_ar->ar_name);
                } else {
                    if ((strftime(buf, DATESIZE,
                        "%b %d %H:%M:%S %Y",
                        localtime(
                        &(p_ar->ar_date)))) == 0) {
                        (void) fprintf(stderr,
"%s: %s: don't have enough space to store the date\n", prog_name, filename);
                        exit(1);
                    }
                    (void) printf(
"\t%s %6d %6d 0%.6ho 0x%.8lx %-s\n\n",
                        buf, (int)p_ar->ar_uid,
                        (int)p_ar->ar_gid,
                        (int)p_ar->ar_mode,
                        p_ar->ar_size, p_ar->ar_name);
                }
            }
        }
        cmd = elf_next(arf);
        (void) elf_end(arf);
    } /* end while */

    err = elf_errno();
    if (err != 0) {
        (void) fprintf(stderr,
            "%s: %s: %s\n", prog_name, filename, elf_errmsg(err));
    }
}

/*
 * Process member files of an archive.  This function provides
 * a loop through an archive equivalent the processing of
 * each_file for individual object files.
 */
static void
dump_ar_files(int fd, Elf *elf_file, char *filename)
{
    Elf_Arhdr  *p_ar;
    Elf *arf;
    Elf_Cmd cmd;
    Elf_Kind file_type;
    GElf_Ehdr elf_head;
    char *fullname;

    cmd = ELF_C_READ;
    while ((arf = elf_begin(fd, cmd, elf_file)) != 0) {
        size_t  len;

        p_ar = elf_getarhdr(arf);
        if (p_ar == NULL) {
            (void) fprintf(stderr, "%s: %s: %s\n",
                prog_name, filename, elf_errmsg(-1));
            return;
        }
        if ((strcmp(p_ar->ar_name, "/") == 0) ||
            (strcmp(p_ar->ar_name, "//") == 0)) {
            cmd = elf_next(arf);
            (void) elf_end(arf);
            continue;
        }

        len = strlen(filename) + strlen(p_ar->ar_name) + 3;
        if ((fullname = malloc(len)) == NULL)
            return;
        (void) snprintf(fullname, len, "%s[%s]", filename,
            p_ar->ar_name);
        (void) printf("\n%s:\n", fullname);
        file_type = elf_kind(arf);
        if (file_type == ELF_K_ELF) {
            if (dump_elf_header(arf, fullname, &elf_head) == NULL)
                return;
            if (o_flag)
                dump_exec_header(arf,
                    (unsigned)elf_head.e_phnum, fullname);
            if (x_flag)
                dump_section_table(arf, &elf_head, fullname);
        } else {
            (void) fprintf(stderr, "%s: %s: invalid file type\n",
                prog_name, fullname);
            cmd = elf_next(arf);
            (void) elf_end(arf);
            continue;
        }

        cmd = elf_next(arf);
        (void) elf_end(arf);
    } /* end while */
}

/*
 * Takes a filename as input.  Test first for a valid version
 * of libelf.a and exit on error.  Process each valid file
 * or archive given as input on the command line.  Check
 * for file type.  If it is an archive, process the archive-
 * specific options first, then files within the archive.
 * If it is an ELF object file, process it; otherwise
 * warn that it is an invalid file type.
 * All options except the archive-specific and program
 * execution header are processed in the function, dump_section_table.
 */
static void
each_file(char *filename)
{
    Elf *elf_file;
    GElf_Ehdr elf_head;
    int fd;
    Elf_Kind   file_type;

    struct stat buf;

    Elf_Cmd cmd;
    errno = 0;

    if (stat(filename, &buf) == -1) {
        int err = errno;
        (void) fprintf(stderr, "%s: %s: %s", prog_name, filename,
            strerror(err));
        return;
    }

    if ((fd = open((filename), O_RDONLY)) == -1) {
        (void) fprintf(stderr, "%s: %s: cannot read\n", prog_name,
            filename);
        return;
    }
    cmd = ELF_C_READ;
    if ((elf_file = elf_begin(fd, cmd, (Elf *)0)) == NULL) {
        (void) fprintf(stderr, "%s: %s: %s\n", prog_name, filename,
            elf_errmsg(-1));
        return;
    }

    file_type = elf_kind(elf_file);
    if (file_type == ELF_K_AR) {
        if (a_flag || g_flag) {
            dump_ar_hdr(fd, elf_file, filename);
            elf_file = elf_begin(fd, cmd, (Elf *)0);
        }
        if (z_flag)
            dump_ar_files(fd, elf_file, filename);
    } else {
        if (file_type == ELF_K_ELF) {
            (void) printf("\n%s:\n", filename);
            if (dump_elf_header(elf_file, filename, &elf_head)) {
                if (o_flag)
                    dump_exec_header(elf_file,
                        (unsigned)elf_head.e_phnum,
                        filename);
                if (x_flag)
                    dump_section_table(elf_file,
                        &elf_head, filename);
            }
        } else {
            (void) fprintf(stderr, "%s: %s: invalid file type\n",
                prog_name, filename);
        }
    }
    (void) elf_end(elf_file);
    (void) close(fd);
}

/*
 * Sets up flags for command line options given and then
 * calls each_file() to process each file.
 */
int
main(int argc, char *argv[], char *envp[])
{
    char *optstr = OPTSTR; /* option string used by getopt() */
    int optchar;

    /*
     * Check for a binary that better fits this architecture.
     */
    (void) conv_check_native(argv, envp);

    prog_name = argv[0];

    (void) setlocale(LC_ALL, "");
    while ((optchar = getopt(argc, argv, optstr)) != -1) {
        switch (optchar) {
        case 'a':
            a_flag = 1;
            x_flag = 1;
            break;
        case 'g':
            g_flag = 1;
            x_flag = 1;
            break;
        case 'v':
            v_flag = 1;
            break;
        case 'p':
            p_flag = 1;
            break;
        case 'f':
            f_flag = 1;
            z_flag = 1;
            break;
        case 'o':
            o_flag = 1;
            z_flag = 1;
            break;
        case 'h':
            h_flag = 1;
            x_flag = 1;
            z_flag = 1;
            break;
        case 's':
            s_flag = 1;
            x_flag = 1;
            z_flag = 1;
            break;
        case 'd':
            d_flag = 1;
            x_flag = 1;
            z_flag = 1;
            set_range(optarg, &d_low, &d_hi);
            break;
        case 'n':
            n_flag++;
            x_flag = 1;
            z_flag = 1;
            name = optarg;
            break;
        case 'r':
            r_flag = 1;
            x_flag = 1;
            z_flag = 1;
            break;
        case 't':
            t_flag = 1;
            x_flag = 1;
            z_flag = 1;
            break;
        case 'C':
            C_flag = 1;
            t_flag = 1;
            x_flag = 1;
            z_flag = 1;
            break;
        case 'T':
            T_flag = 1;
            x_flag = 1;
            z_flag = 1;
            set_range(optarg, &T_low, &T_hi);
            break;
        case 'c':
            c_flag = 1;
            x_flag = 1;
            z_flag = 1;
            break;
        case 'L':
            L_flag = 1;
            x_flag = 1;
            z_flag = 1;
            break;
        case 'V':
            V_flag = 1;
            (void) fprintf(stderr, "dump: %s %s\n",
                (const char *)SGU_PKG,
                (const char *)SGU_REL);
            break;
        case '?':
            errflag += 1;
            break;
        default:
            break;
        }
    }

    if (errflag || (optind >= argc) || (!z_flag && !x_flag)) {
        if (!(V_flag && (argc == 2))) {
            usage();
            exit(269);
        }
    }

    if (elf_version(EV_CURRENT) == EV_NONE) {
        (void) fprintf(stderr, "%s: libelf is out of date\n",
            prog_name);
        exit(101);
    }

    while (optind < argc) {
        each_file(argv[optind]);
        optind++;
    }
    return (0);
}