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/*********************************************************
* Copyright (C) 2005 VMware, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation version 2.1 and no later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the Lesser GNU General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
*********************************************************/
/*********************************************************
* The contents of this file are subject to the terms of the Common
* Development and Distribution License (the "License") version 1.0
* and no later version. You may not use this file except in
* compliance with the License.
*
* You can obtain a copy of the License at
* http://www.opensource.org/licenses/cddl1.php
*
* See the License for the specific language governing permissions
* and limitations under the License.
*
*********************************************************/
/*
* backdoorGcc32.c --
*
* Implements the real work for guest-side backdoor for GCC, 32-bit
* target (supports inline ASM, GAS syntax). The asm sections are marked
* volatile since vmware can change the registers content without the
* compiler knowing it.
*
* XXX
* I tried to write this more cleanly, but:
* - There is no way to specify an "ebp" constraint
* - "ebp" is ignored when specified as cloberred register
* - gas barfs when there is more than 10 operands
* - gas 2.7.2.3, depending on the order of the operands, can
* mis-assemble without any warning
* --hpreg
*
* Note that the problems with gas noted above might longer be relevant
* now that we've upgraded most of our compiler versions.
* --rrdharan
*/
#ifdef __cplusplus
extern "C" {
#endif
#include "backdoor.h"
#include "backdoorInt.h"
/*
*----------------------------------------------------------------------------
*
* Backdoor_InOut --
*
* Send a low-bandwidth basic request (16 bytes) to vmware, and return its
* reply (24 bytes).
*
* Results:
* Host-side response returned in bp IN/OUT parameter.
*
* Side effects:
* Pokes the backdoor.
*
*----------------------------------------------------------------------------
*/
void
Backdoor_InOut(Backdoor_proto *myBp) // IN/OUT
{
uint32 dummy;
__asm__ __volatile__(
#ifdef __PIC__
"pushl %%ebx" "\n\t"
#endif
"pushl %%eax" "\n\t"
"movl 20(%%eax), %%edi" "\n\t"
"movl 16(%%eax), %%esi" "\n\t"
"movl 12(%%eax), %%edx" "\n\t"
"movl 8(%%eax), %%ecx" "\n\t"
"movl 4(%%eax), %%ebx" "\n\t"
"movl (%%eax), %%eax" "\n\t"
"inl %%dx, %%eax" "\n\t"
"xchgl %%eax, (%%esp)" "\n\t"
"movl %%edi, 20(%%eax)" "\n\t"
"movl %%esi, 16(%%eax)" "\n\t"
"movl %%edx, 12(%%eax)" "\n\t"
"movl %%ecx, 8(%%eax)" "\n\t"
"movl %%ebx, 4(%%eax)" "\n\t"
"popl (%%eax)" "\n\t"
#ifdef __PIC__
"popl %%ebx" "\n\t"
#endif
: "=a" (dummy)
: "0" (myBp)
/*
* vmware can modify the whole VM state without the compiler knowing
* it. So far it does not modify EFLAGS. --hpreg
*/
:
#ifndef __PIC__
"ebx",
#endif
"ecx", "edx", "esi", "edi", "memory"
);
}
/*
*-----------------------------------------------------------------------------
*
* BackdoorHbIn --
* BackdoorHbOut --
*
* Send a high-bandwidth basic request to vmware, and return its
* reply.
*
* Results:
* Host-side response returned in bp IN/OUT parameter.
*
* Side-effects:
* Pokes the high-bandwidth backdoor port.
*
*-----------------------------------------------------------------------------
*/
void
BackdoorHbIn(Backdoor_proto_hb *myBp) // IN/OUT
{
uint32 dummy;
__asm__ __volatile__(
#ifdef __PIC__
"pushl %%ebx" "\n\t"
#endif
"pushl %%ebp" "\n\t"
"pushl %%eax" "\n\t"
"movl 24(%%eax), %%ebp" "\n\t"
"movl 20(%%eax), %%edi" "\n\t"
"movl 16(%%eax), %%esi" "\n\t"
"movl 12(%%eax), %%edx" "\n\t"
"movl 8(%%eax), %%ecx" "\n\t"
"movl 4(%%eax), %%ebx" "\n\t"
"movl (%%eax), %%eax" "\n\t"
"cld" "\n\t"
"rep; insb" "\n\t"
"xchgl %%eax, (%%esp)" "\n\t"
"movl %%ebp, 24(%%eax)" "\n\t"
"movl %%edi, 20(%%eax)" "\n\t"
"movl %%esi, 16(%%eax)" "\n\t"
"movl %%edx, 12(%%eax)" "\n\t"
"movl %%ecx, 8(%%eax)" "\n\t"
"movl %%ebx, 4(%%eax)" "\n\t"
"popl (%%eax)" "\n\t"
"popl %%ebp" "\n\t"
#ifdef __PIC__
"popl %%ebx" "\n\t"
#endif
: "=a" (dummy)
: "0" (myBp)
/*
* vmware can modify the whole VM state without the compiler knowing
* it. --hpreg
*/
:
#ifndef __PIC__
"ebx",
#endif
"ecx", "edx", "esi", "edi", "memory", "cc"
);
}
void
BackdoorHbOut(Backdoor_proto_hb *myBp) // IN/OUT
{
uint32 dummy;
__asm__ __volatile__(
#ifdef __PIC__
"pushl %%ebx" "\n\t"
#endif
"pushl %%ebp" "\n\t"
"pushl %%eax" "\n\t"
"movl 24(%%eax), %%ebp" "\n\t"
"movl 20(%%eax), %%edi" "\n\t"
"movl 16(%%eax), %%esi" "\n\t"
"movl 12(%%eax), %%edx" "\n\t"
"movl 8(%%eax), %%ecx" "\n\t"
"movl 4(%%eax), %%ebx" "\n\t"
"movl (%%eax), %%eax" "\n\t"
"cld" "\n\t"
"rep; outsb" "\n\t"
"xchgl %%eax, (%%esp)" "\n\t"
"movl %%ebp, 24(%%eax)" "\n\t"
"movl %%edi, 20(%%eax)" "\n\t"
"movl %%esi, 16(%%eax)" "\n\t"
"movl %%edx, 12(%%eax)" "\n\t"
"movl %%ecx, 8(%%eax)" "\n\t"
"movl %%ebx, 4(%%eax)" "\n\t"
"popl (%%eax)" "\n\t"
"popl %%ebp" "\n\t"
#ifdef __PIC__
"popl %%ebx" "\n\t"
#endif
: "=a" (dummy)
: "0" (myBp)
:
#ifndef __PIC__
"ebx",
#endif
"ecx", "edx", "esi", "edi", "memory", "cc"
);
}
#ifdef __cplusplus
}
#endif
|
