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# Copyright (c) 2007-2008 The Hewlett-Packard Development Company
# All rights reserved.
#
# Redistribution and use of this software in source and binary forms,
# with or without modification, are permitted provided that the
# following conditions are met:
#
# The software must be used only for Non-Commercial Use which means any
# use which is NOT directed to receiving any direct monetary
# compensation for, or commercial advantage from such use. Illustrative
# examples of non-commercial use are academic research, personal study,
# teaching, education and corporate research & development.
# Illustrative examples of commercial use are distributing products for
# commercial advantage and providing services using the software for
# commercial advantage.
#
# If you wish to use this software or functionality therein that may be
# covered by patents for commercial use, please contact:
# Director of Intellectual Property Licensing
# Office of Strategy and Technology
# Hewlett-Packard Company
# 1501 Page Mill Road
# Palo Alto, California 94304
#
# 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
# the COPYRIGHT HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission. No right of
# sublicense is granted herewith. Derivatives of the software and
# output created using the software may be prepared, but only for
# Non-Commercial Uses. Derivatives of the software may be shared with
# others provided: (i) the others agree to abide by the list of
# conditions herein which includes the Non-Commercial Use restrictions;
# and (ii) such Derivatives of the software include the above copyright
# notice to acknowledge the contribution from this software where
# applicable, this list of conditions and the disclaimer below.
#
# 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 THE COPYRIGHT
# OWNER 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.
#
# Authors: Gabe Black
microcode = '''
def macroop RET_NEAR
{
# Make the default data size of rets 64 bits in 64 bit mode
.adjust_env oszIn64Override
ld t1, ss, [1, t0, rsp]
# Check address of return
addi rsp, rsp, dsz
wripi t1, 0
};
def macroop RET_NEAR_I
{
# Make the default data size of rets 64 bits in 64 bit mode
.adjust_env oszIn64Override
limm t2, imm
ld t1, ss, [1, t0, rsp]
# Check address of return
addi rsp, rsp, dsz
add rsp, rsp, t2
wripi t1, 0
};
def macroop RET_FAR {
.adjust_env oszIn64Override
# Get the return RIP
ld t1, ss, [1, t0, rsp]
# Get the return CS
ld t2, ss, [1, t0, rsp], ssz
# Get the rpl
andi t3, t2, 0x3
# Get the cpl
# Here we'd check if we're changing priviledge levels. We'll just hope
# that doesn't happen yet.
# Do stuff if they're equal
andi t0, t2, 0xFC, flags=(EZF,), dataSize=2
bri t0, label("processDescriptor"), flags=(CEZF,)
andi t3, t2, 0xF8, dataSize=8
andi t0, t2, 0x4, flags=(EZF,), dataSize=2
bri t0, label("globalDescriptor"), flags=(CEZF,)
ld t3, tsl, [1, t0, t3], dataSize=8
bri t0, label("processDescriptor")
globalDescriptor:
ld t3, tsg, [1, t0, t3], dataSize=8
processDescriptor:
chks t2, t3, IretCheck, dataSize=8
# There should be validity checks on the RIP checks here, but I'll do
# that later.
wrdl cs, t3, t2
wrsel cs, t2
wrip t0, t1
bri t0, label("end")
# Do other stuff if they're not.
end:
fault "NoFault"
};
'''
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