demo/common/dis.c

/*
 * 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) 1995, 2010, Oracle and/or its affiliates. All rights reserved.
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/signal.h>
#include <sys/fault.h>
#include <sys/syscall.h>
#include <procfs.h>
#include <sys/auxv.h>
#include <libelf.h>
#include <sys/param.h>
#include <stdarg.h>

#include "rdb.h"
#include "disasm.h"

/*
 * I don't like this global but it's a work-around for the
 * poor disassemble interface for now.
 */
static struct ps_prochandle *cur_ph;

/*
 * This routine converts 'address' into it's closest symbol
 * representation.
 *
 * The following flags are used to effect the output:
 *
 *  FLG_PAP_SONAME
 *      embed the SONAME in the symbol name
 *  FLG_PAP_NOHEXNAME
 *      if no symbol found return a null string
 *      If this flag is not set return a string displaying
 *      the 'hex' value of address.
 *  FLG_PAP_PLTDECOM
 *      decompose the PLT symbol if possible
 */
char *
print_address_ps(struct ps_prochandle *ph, ulong_t address, unsigned flags)
{
    static char buf[256];
    GElf_Sym    sym;
    char        *str;
    ulong_t     val;

    if (addr_to_sym(ph, address, &sym, &str) == RET_OK) {
        map_info_t  *mip;
        ulong_t     pltbase;

        if (flags & FLG_PAP_SONAME) {
            /*
             * Embed SOName in symbol name
             */
            if ((mip = addr_to_map(ph, address)) != 0) {
                (void) strcpy(buf, mip->mi_name);
                (void) strcat(buf, ":");
            } else
                (void) sprintf(buf, "0x%08lx:", address);
        } else
            buf[0] = '\0';

        if ((flags & FLG_PAP_PLTDECOM) &&
            (pltbase = is_plt(ph, address)) != 0) {
            rd_plt_info_t   rp;
            pstatus_t   pstatus;

            if (pread(ph->pp_statusfd, &pstatus,
                sizeof (pstatus), 0) == -1)
                perr("pap: reading pstatus");

            if (rd_plt_resolution(ph->pp_rap, address,
                pstatus.pr_lwp.pr_lwpid, pltbase,
                &rp) == RD_OK) {
                if (rp.pi_flags & RD_FLG_PI_PLTBOUND) {
                    GElf_Sym    _sym;
                    char        *_str;

                    if (addr_to_sym(ph, rp.pi_baddr,
                        &_sym, &_str) == RET_OK) {
                        (void) snprintf(buf, 256,
                            "%s0x%lx:plt(%s)",
                            buf, address, _str);
                        return (buf);
                    }
                }
            }
            val = sym.st_value;
            (void) snprintf(buf, 256, "%s0x%lx:plt(unbound)+0x%lx",
                buf, address, address - val);
            return (buf);
        } else {

            val = sym.st_value;

            if (val < address)
                (void) snprintf(buf, 256, "%s%s+0x%lx", buf,
                    str, address - val);
            else
                (void) snprintf(buf, 256, "%s%s", buf, str);
            return (buf);
        }
    } else {
        if (flags & FLG_PAP_NOHEXNAME)
            buf[0] = '\0';
        else
            (void) sprintf(buf, "0x%lx", address);
        return (buf);
    }
}

char *
print_address(unsigned long address)
{
    return (print_address_ps(cur_ph, address,
        FLG_PAP_SONAME| FLG_PAP_PLTDECOM));
}

retc_t
disasm_addr(struct ps_prochandle *ph, ulong_t addr, int num_inst)
{
    ulong_t     offset, end;
    int     vers = V8_MODE;

    if (ph->pp_dmodel == PR_MODEL_LP64)
        vers = V9_MODE | V9_SGI_MODE;

    for (offset = addr, end = addr + num_inst * 4; offset < end;
        offset += 4) {
        char        *instr_str;
        unsigned int    instr;

        if (ps_pread(ph, offset, (char *)&instr,
            sizeof (unsigned)) != PS_OK)
            perror("da: ps_pread");

        cur_ph = ph;
        instr_str = disassemble(instr, offset, print_address, 0, 0,
            vers);

        (void) printf("%-30s: %s\n", print_address(offset), instr_str);
    }
    return (RET_OK);
}

void
disasm(struct ps_prochandle *ph, int num_inst)
{
    pstatus_t   pstat;

    if (pread(ph->pp_statusfd, &pstat, sizeof (pstat), 0) == -1)
        perr("disasm: PIOCSTATUS");

    (void) disasm_addr(ph, (ulong_t)pstat.pr_lwp.pr_reg[R_PC], num_inst);
}