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/*
* 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 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
* Copyright 2012 Joshua M. Clulow <josh@sysmgr.org>
* Copyright 2015 Nexenta Systems, Inc. All rights reserved.
*/
#include <libdisasm.h>
#include "dis_tables.h"
#include "libdisasm_impl.h"
typedef struct dis_handle_i386 {
int dhx_mode;
dis86_t dhx_dis;
uint64_t dhx_end;
} dis_handle_i386_t;
/*
* Returns true if we are near the end of a function. This is a cheap hack at
* detecting NULL padding between functions. If we're within a few bytes of the
* next function, or past the start, then return true.
*/
static int
check_func(void *data)
{
dis_handle_t *dhp = data;
uint64_t start;
size_t len;
if (dhp->dh_lookup(dhp->dh_data, dhp->dh_addr, NULL, 0, &start, &len)
!= 0)
return (0);
if (start < dhp->dh_addr)
return (dhp->dh_addr > start + len - 0x10);
return (1);
}
static int
get_byte(void *data)
{
uchar_t byte;
dis_handle_t *dhp = data;
if (dhp->dh_read(dhp->dh_data, dhp->dh_addr, &byte, sizeof (byte)) !=
sizeof (byte))
return (-1);
dhp->dh_addr++;
return ((int)byte);
}
static int
do_lookup(void *data, uint64_t addr, char *buf, size_t buflen)
{
dis_handle_t *dhp = data;
return (dhp->dh_lookup(dhp->dh_data, addr, buf, buflen, NULL, NULL));
}
static void
dis_i386_handle_detach(dis_handle_t *dhp)
{
dis_free(dhp->dh_arch_private, sizeof (dis_handle_i386_t));
dhp->dh_arch_private = NULL;
}
static int
dis_i386_handle_attach(dis_handle_t *dhp)
{
dis_handle_i386_t *dhx;
/*
* Validate architecture flags
*/
if (dhp->dh_flags & ~(DIS_X86_SIZE16 | DIS_X86_SIZE32 | DIS_X86_SIZE64 |
DIS_OCTAL | DIS_NOIMMSYM)) {
(void) dis_seterrno(E_DIS_INVALFLAG);
return (-1);
}
/*
* Create and initialize the internal structure
*/
if ((dhx = dis_zalloc(sizeof (dis_handle_i386_t))) == NULL) {
(void) dis_seterrno(E_DIS_NOMEM);
return (-1);
}
dhp->dh_arch_private = dhx;
/*
* Initialize x86-specific architecture structure
*/
if (dhp->dh_flags & DIS_X86_SIZE16)
dhx->dhx_mode = SIZE16;
else if (dhp->dh_flags & DIS_X86_SIZE64)
dhx->dhx_mode = SIZE64;
else
dhx->dhx_mode = SIZE32;
if (dhp->dh_flags & DIS_OCTAL)
dhx->dhx_dis.d86_flags = DIS_F_OCTAL;
dhx->dhx_dis.d86_sprintf_func = dis_snprintf;
dhx->dhx_dis.d86_get_byte = get_byte;
dhx->dhx_dis.d86_sym_lookup = do_lookup;
dhx->dhx_dis.d86_check_func = check_func;
dhx->dhx_dis.d86_data = dhp;
return (0);
}
static int
dis_i386_disassemble(dis_handle_t *dhp, uint64_t addr, char *buf,
size_t buflen)
{
dis_handle_i386_t *dhx = dhp->dh_arch_private;
dhp->dh_addr = addr;
/* DIS_NOIMMSYM might not be set until now, so update */
if (dhp->dh_flags & DIS_NOIMMSYM)
dhx->dhx_dis.d86_flags |= DIS_F_NOIMMSYM;
else
dhx->dhx_dis.d86_flags &= ~DIS_F_NOIMMSYM;
if (dtrace_disx86(&dhx->dhx_dis, dhx->dhx_mode) != 0)
return (-1);
if (buf != NULL)
dtrace_disx86_str(&dhx->dhx_dis, dhx->dhx_mode, addr, buf,
buflen);
return (0);
}
/* ARGSUSED */
static int
dis_i386_max_instrlen(dis_handle_t *dhp)
{
return (15);
}
/* ARGSUSED */
static int
dis_i386_min_instrlen(dis_handle_t *dhp)
{
return (1);
}
static int
dis_i386_supports_flags(int flags)
{
int archflags = flags & DIS_ARCH_MASK;
if (archflags == DIS_X86_SIZE16 || archflags == DIS_X86_SIZE32 ||
archflags == DIS_X86_SIZE64)
return (1);
return (0);
}
dis_arch_t dis_arch_i386 = {
.da_supports_flags = dis_i386_supports_flags,
.da_handle_attach = dis_i386_handle_attach,
.da_handle_detach = dis_i386_handle_detach,
.da_disassemble = dis_i386_disassemble,
.da_min_instrlen = dis_i386_min_instrlen,
.da_max_instrlen = dis_i386_max_instrlen,
};
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