summaryrefslogtreecommitdiff
path: root/src/arch
diff options
context:
space:
mode:
authorGabe Black <gblack@eecs.umich.edu>2007-12-01 23:01:17 -0800
committerGabe Black <gblack@eecs.umich.edu>2007-12-01 23:01:17 -0800
commit62c79ca63703ee2b2c5947016c0c5e10744c2479 (patch)
treee47c3ccb24647e643aea3959cd0d9e7b50f79858 /src/arch
parent4e3ff42762f8fd08e130b10e59525139f12c932d (diff)
downloadgem5-62c79ca63703ee2b2c5947016c0c5e10744c2479.tar.xz
X86: Implement the lgdt instruction.
--HG-- extra : convert_revision : d1698a82df3c57cc9bbf8d5d190f271bfc7cb2e4
Diffstat (limited to 'src/arch')
-rw-r--r--src/arch/x86/isa/decoder/two_byte_opcodes.isa10
-rw-r--r--src/arch/x86/isa/insts/system/__init__.py3
-rw-r--r--src/arch/x86/isa/insts/system/segmentation.py113
-rw-r--r--src/arch/x86/isa/microasm.isa11
-rw-r--r--src/arch/x86/isa/microops/regop.isa4
-rw-r--r--src/arch/x86/isa/operands.isa4
-rw-r--r--src/arch/x86/segmentregs.hh10
7 files changed, 149 insertions, 6 deletions
diff --git a/src/arch/x86/isa/decoder/two_byte_opcodes.isa b/src/arch/x86/isa/decoder/two_byte_opcodes.isa
index f3485bc4e..ecd575a5d 100644
--- a/src/arch/x86/isa/decoder/two_byte_opcodes.isa
+++ b/src/arch/x86/isa/decoder/two_byte_opcodes.isa
@@ -109,7 +109,15 @@
default: decode MODRM_REG {
0x0: sgdt_Ms();
0x1: sidt_Ms();
- 0x2: lgdt_Ms();
+ 0x2: decode MODE_SUBMODE {
+ 0x0: Inst::LGDT(M);
+ default: decode OPSIZE {
+ // 16 bit operand sizes are special, but only
+ // in legacy and compatability modes.
+ 0x2: Inst::LGDT_16(M);
+ default: Inst::LGDT(M);
+ }
+ }
0x3: lidt_Ms();
0x4: smsw_Mw();
0x6: lmsw_Mw();
diff --git a/src/arch/x86/isa/insts/system/__init__.py b/src/arch/x86/isa/insts/system/__init__.py
index 422438b1c..5984761a6 100644
--- a/src/arch/x86/isa/insts/system/__init__.py
+++ b/src/arch/x86/isa/insts/system/__init__.py
@@ -55,7 +55,8 @@
categories = ["halt",
"undefined_operation",
- "msrs"]
+ "msrs",
+ "segmentation"]
microcode = ""
for category in categories:
diff --git a/src/arch/x86/isa/insts/system/segmentation.py b/src/arch/x86/isa/insts/system/segmentation.py
new file mode 100644
index 000000000..6067f64a0
--- /dev/null
+++ b/src/arch/x86/isa/insts/system/segmentation.py
@@ -0,0 +1,113 @@
+# Copyright (c) 2007 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 LGDT_M
+{
+ .adjust_env oszForPseudoDesc
+
+ # Get the limit
+ ld t1, seg, sib, disp, dataSize=2
+ # Get the base
+ ld t2, seg, sib, 'adjustedDisp + 2'
+ wrbase gdtr, t2
+ wrlimit gdtr, t1
+};
+
+def macroop LGDT_P
+{
+ .adjust_env oszForPseudoDesc
+
+ rdip t7
+ # Get the limit
+ ld t1, seg, riprel, disp, dataSize=2
+ # Get the base
+ ld t2, seg, riprel, 'adjustedDisp + 2'
+ wrbase gdtr, t2
+ wrlimit gdtr, t1
+};
+
+#
+# These versions are for when the original data size was 16 bits. The base is
+# still 32 bits, but the top byte is zeroed before being used.
+#
+
+def macroop LGDT_16_M
+{
+ .adjust_env oszForPseudoDesc
+
+ # Get the limit
+ ld t1, seg, sib, disp, dataSize=2
+ # Get the base
+ ld t2, seg, sib, 'adjustedDisp + 2', dataSize=4
+ zexti t2, t2, 23
+ wrbase gdtr, t2
+ wrlimit gdtr, t1
+};
+
+def macroop LGDT_16_P
+{
+ .adjust_env oszForPseudoDesc
+
+ rdip t7
+ # Get the limit
+ ld t1, seg, riprel, disp, dataSize=2
+ # Get the base
+ ld t2, seg, riprel, 'adjustedDisp + 2', dataSize=4
+ zexti t2, t2, 23
+ wrbase gdtr, t2
+ wrlimit gdtr, t1
+};
+'''
diff --git a/src/arch/x86/isa/microasm.isa b/src/arch/x86/isa/microasm.isa
index 040bb2036..8c499eeed 100644
--- a/src/arch/x86/isa/microasm.isa
+++ b/src/arch/x86/isa/microasm.isa
@@ -80,6 +80,10 @@ let {{
# Add in symbols for the segment descriptor registers
for letter in ("C", "D", "E", "F", "G", "S"):
assembler.symbols["%ss" % letter.lower()] = "SEGMENT_REG_%sS" % letter
+
+ for reg in ("LDTR", "TR", "GDTR", "IDTR"):
+ assembler.symbols[reg.lower()] = "SYS_SEGMENT_REG_%s" % reg
+
# Miscellaneous symbols
symbols = {
"reg" : "env.reg",
@@ -138,6 +142,13 @@ let {{
env.dataSize = 8;
'''
+ assembler.symbols["oszForPseudoDesc"] = '''
+ if (machInst.mode.submode == SixtyFourBitMode)
+ env.dataSize = 8;
+ else
+ env.dataSize = 4;
+ '''
+
def trimImm(width):
return "adjustedImm = adjustedImm & mask(%s);" % width
diff --git a/src/arch/x86/isa/microops/regop.isa b/src/arch/x86/isa/microops/regop.isa
index 67e6fa1e9..f37b4327b 100644
--- a/src/arch/x86/isa/microops/regop.isa
+++ b/src/arch/x86/isa/microops/regop.isa
@@ -942,7 +942,7 @@ let {{
super(Wrbase, self).__init__(dest, \
src1, "NUM_INTREGS", flags, dataSize)
code = '''
- SegBaseDest = psrc1;
+ SysSegBaseDest = psrc1;
'''
class Wrlimit(RegOp):
@@ -950,6 +950,6 @@ let {{
super(Wrlimit, self).__init__(dest, \
src1, "NUM_INTREGS", flags, dataSize)
code = '''
- SegLimitDest = psrc1;
+ SysSegLimitDest = psrc1;
'''
}};
diff --git a/src/arch/x86/isa/operands.isa b/src/arch/x86/isa/operands.isa
index fff60ce60..40c8ee9c2 100644
--- a/src/arch/x86/isa/operands.isa
+++ b/src/arch/x86/isa/operands.isa
@@ -127,8 +127,8 @@ def operands {{
'EferOp': ('ControlReg', 'uqw', 'MISCREG_EFER', (None, None, ['IsSerializeAfter','IsSerializing','IsNonSpeculative']), 73),
'CR4Op': ('ControlReg', 'uqw', 'MISCREG_CR4', (None, None, ['IsSerializeAfter','IsSerializing','IsNonSpeculative']), 74),
'CSBase': ('ControlReg', 'udw', 'MISCREG_CS_EFF_BASE', (None, None, ['IsSerializeAfter','IsSerializing','IsNonSpeculative']), 80),
- 'SegBaseDest': ('ControlReg', 'uqw', 'MISCREG_SEG_BASE(dest)', (None, None, ['IsSerializeAfter','IsSerializing','IsNonSpeculative']), 75),
- 'SegLimitDest': ('ControlReg', 'uqw', 'MISCREG_SEG_LIMIT(dest)', (None, None, ['IsSerializeAfter','IsSerializing','IsNonSpeculative']), 76),
+ 'SysSegBaseDest': ('ControlReg', 'uqw', 'MISCREG_SYSSEG_BASE(dest)', (None, None, ['IsSerializeAfter','IsSerializing','IsNonSpeculative']), 75),
+ 'SysSegLimitDest': ('ControlReg', 'uqw', 'MISCREG_SYSSEG_LIMIT(dest)', (None, None, ['IsSerializeAfter','IsSerializing','IsNonSpeculative']), 76),
'Mem': ('Mem', 'uqw', None, ('IsMemRef', 'IsLoad', 'IsStore'), 100)
}};
diff --git a/src/arch/x86/segmentregs.hh b/src/arch/x86/segmentregs.hh
index 524b756d6..e6079da6d 100644
--- a/src/arch/x86/segmentregs.hh
+++ b/src/arch/x86/segmentregs.hh
@@ -72,6 +72,16 @@ namespace X86ISA
NUM_SEGMENTREGS
};
+
+ enum SysSegmentRegIndex
+ {
+ SYS_SEGMENT_REG_LDTR,
+ SYS_SEGMENT_REG_TR,
+ SYS_SEGMENT_REG_GDTR,
+ SYS_SEGMENT_REG_IDTR,
+
+ NUM_SYSSEGMENTREGS
+ };
};
#endif // __ARCH_X86_SEGMENTREGS_HH__