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# Copyright (c) 2007 The Hewlett-Packard Development Company
# All rights reserved.
#
# The license below extends only to copyright in the software and shall
# not be construed as granting a license to any other intellectual
# property including but not limited to intellectual property relating
# to a hardware implementation of the functionality of the software
# licensed hereunder. You may use the software subject to the license
# terms below provided that you ensure that this notice is replicated
# unmodified and in its entirety in all distributions of the software,
# modified or unmodified, in source code or in binary form.
#
# 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 the copyright holders 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 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 JMP_I
{
# Make the default data size of jumps 64 bits in 64 bit mode
.adjust_env oszIn64Override
rdip t1
limm t2, imm
wrip t1, t2
};
def macroop JMP_R
{
# Make the default data size of jumps 64 bits in 64 bit mode
.adjust_env oszIn64Override
wripi reg, 0
};
def macroop JMP_M
{
# Make the default data size of jumps 64 bits in 64 bit mode
.adjust_env oszIn64Override
ld t1, seg, sib, disp
wripi t1, 0
};
def macroop JMP_P
{
# Make the default data size of jumps 64 bits in 64 bit mode
.adjust_env oszIn64Override
rdip t7
ld t1, seg, riprel, disp
wripi t1, 0
};
def macroop JMP_FAR_M
{
limm t1, 0, dataSize=8
limm t2, 0, dataSize=8
lea t1, seg, sib, disp, dataSize=asz
ld t2, seg, [1, t0, t1], dsz
ld t1, seg, [1, t0, t1]
br rom_label("jmpFarWork")
};
def macroop JMP_FAR_P
{
limm t1, 0, dataSize=8
limm t2, 0, dataSize=8
rdip t7, dataSize=asz
lea t1, seg, riprel, disp, dataSize=asz
ld t2, seg, [1, t0, t1], dsz
ld t1, seg, [1, t0, t1]
br rom_label("jmpFarWork")
};
def macroop JMP_FAR_I
{
# Put the whole far pointer into a register.
limm t2, imm, dataSize=8
# Figure out the width of the offset.
limm t3, dsz, dataSize=8
slli t3, t3, 3, dataSize=8
# Get the offset into t1.
mov t1, t0, t2
# Get the selector into t2.
srl t2, t2, t3, dataSize=8
mov t2, t0, t2, dataSize=2
br rom_label("jmpFarWork")
};
def rom
{
extern jmpFarWork:
# t1 has the offset and t2 has the new selector.
# This is intended to run in protected mode.
andi t0, t2, 0xFC, flags=(EZF,), dataSize=2
fault "new GeneralProtection(0)", flags=(CEZF,)
andi t3, t2, 0xF8, dataSize=8
andi t0, t2, 0x4, flags=(EZF,), dataSize=2
br rom_local_label("farJmpGlobalDescriptor"), flags=(CEZF,)
ld t4, tsl, [1, t0, t3], dataSize=8, addressSize=8, atCPL0=True
br rom_local_label("farJmpProcessDescriptor")
farJmpGlobalDescriptor:
ld t4, tsg, [1, t0, t3], dataSize=8, addressSize=8, atCPL0=True
farJmpProcessDescriptor:
rcri t0, t4, 13, flags=(ECF,), dataSize=2
br rom_local_label("farJmpSystemDescriptor"), flags=(nCECF,)
chks t2, t4, CSCheck, dataSize=8
wrdl cs, t4, t2
wrsel cs, t2
wrip t0, t1
eret
farJmpSystemDescriptor:
panic "Far jumps to system descriptors aren't implemented"
eret
};
def macroop JMP_FAR_REAL_M
{
lea t1, seg, sib, disp, dataSize=asz
ld t2, seg, [1, t0, t1], dsz
ld t1, seg, [1, t0, t1]
zexti t3, t1, 15, dataSize=8
slli t3, t3, 4, dataSize=8
wrsel cs, t1, dataSize=2
wrbase cs, t3
wrip t0, t2, dataSize=asz
};
def macroop JMP_FAR_REAL_P
{
panic "Real mode far jump executed in 64 bit mode!"
};
def macroop JMP_FAR_REAL_I
{
# Put the whole far pointer into a register.
limm t2, imm, dataSize=8
# Figure out the width of the offset.
limm t3, dsz, dataSize=8
slli t3, t3, 3, dataSize=8
# Get the selector into t1.
sll t1, t2, t3, dataSize=8
mov t1, t0, t1, dataSize=2
# And get the offset into t2
mov t2, t0, t2
slli t3, t3, 4, dataSize=8
wrsel cs, t1, dataSize=2
wrbase cs, t3
wrip t0, t2, dataSize=asz
};
'''
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