suite/tests/client-interface/syscall-mod.dll.c

/* **********************************************************
 * Copyright (c) 2008 VMware, Inc.  All rights reserved.
 * **********************************************************/

/*
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * * 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.
 *
 * * Neither the name of VMware, Inc. nor the names of its contributors may be
 *   used to endorse or promote products derived from this software without
 *   specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 VMWARE, INC. OR CONTRIBUTORS 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 "dr_api.h"
#include <syscall.h>

/* Tests removing a system call. */

#define MINSERT instrlist_meta_preinsert

static
dr_emit_flags_t bb_event(void* drcontext, void *tag, instrlist_t* bb,
                         bool for_trace, bool translating)
{
    instr_t *instr;
    instr_t *next_instr;
    reg_t in_eax = -1;

    for (instr = instrlist_first(bb); instr != NULL; instr = next_instr) {
        next_instr = instr_get_next(instr);
        if (instr_get_opcode(instr) == OP_mov_imm &&
            opnd_get_reg(instr_get_dst(instr, 0)) == REG_EAX)
            in_eax = opnd_get_immed_int(instr_get_src(instr, 0));
        if (instr_is_syscall(instr) &&
            in_eax == SYS_getpid) {
            instr_t *myval = INSTR_CREATE_mov_imm
                (drcontext, opnd_create_reg(REG_EAX), OPND_CREATE_INT32(-7));
            instr_set_translation(myval, instr_get_app_pc(instr));
            instrlist_preinsert(bb, instr, myval);
            instrlist_remove(bb, instr);
            instr_destroy(drcontext, instr);
        }
    }
    return DR_EMIT_DEFAULT;
}

DR_EXPORT
void dr_init(client_id_t id)
{
    dr_register_bb_event(bb_event);
}