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authorGabe Black <gblack@eecs.umich.edu>2007-08-04 20:24:18 -0700
committerGabe Black <gblack@eecs.umich.edu>2007-08-04 20:24:18 -0700
commit30e777a5d3829975266ecccac965d2297a5f4985 (patch)
tree2363a13c29576b5e3fb027736a817686faaaba67 /src/arch/x86/isa
parent802f13e6bdbbc2d6af5a7669a18c0893e5347de6 (diff)
downloadgem5-30e777a5d3829975266ecccac965d2297a5f4985.tar.xz
X86: Implement microops and instructions that manipulate the flags register.
--HG-- extra : convert_revision : 566841577bf4a98cac0b65292fe0f7daf89a9203
Diffstat (limited to 'src/arch/x86/isa')
-rw-r--r--src/arch/x86/isa/decoder/one_byte_opcodes.isa12
-rw-r--r--src/arch/x86/isa/insts/flags/set_and_clear.py43
-rw-r--r--src/arch/x86/isa/insts/semaphores.py6
-rw-r--r--src/arch/x86/isa/microops/regop.isa4
-rw-r--r--src/arch/x86/isa/specialize.isa4
5 files changed, 46 insertions, 23 deletions
diff --git a/src/arch/x86/isa/decoder/one_byte_opcodes.isa b/src/arch/x86/isa/decoder/one_byte_opcodes.isa
index 7c627b0c2..cce07d6fe 100644
--- a/src/arch/x86/isa/decoder/one_byte_opcodes.isa
+++ b/src/arch/x86/isa/decoder/one_byte_opcodes.isa
@@ -529,13 +529,13 @@
}
}
0x1F: decode OPCODE_OP_BOTTOM3 {
- 0x0: clc();
- 0x1: stc();
- 0x2: cli();
- 0x3: sti();
- 0x4: cld();
- 0x5: std();
format Inst {
+ 0x0: CLC();
+ 0x1: STC();
+ 0x2: WarnUnimpl::cli();
+ 0x3: WarnUnimpl::sti();
+ 0x4: CLD();
+ 0x5: STD();
//0x6: group4();
0x6: decode MODRM_REG {
0x0: INC(Eb);
diff --git a/src/arch/x86/isa/insts/flags/set_and_clear.py b/src/arch/x86/isa/insts/flags/set_and_clear.py
index d70b95382..4c655e0b2 100644
--- a/src/arch/x86/isa/insts/flags/set_and_clear.py
+++ b/src/arch/x86/isa/insts/flags/set_and_clear.py
@@ -53,18 +53,39 @@
#
# Authors: Gabe Black
-microcode = ""
+microcode = '''
+def macroop CLD {
+ ruflags t1
+ limm t2, "~((uint64_t)DFBit)"
+ and t1, t1, t2
+ wruflags t1, t0
+};
+
+def macroop STD {
+ ruflags t1
+ limm t2, "DFBit"
+ or t1, t1, t2
+ wruflags t1, t0
+};
+
+def macroop CLC {
+ ruflags t1
+ andi t2, t1, "CFBit"
+ wruflags t1, t2
+};
+
+def macroop STC {
+ ruflags t1
+ ori t1, t1, "CFBit"
+ wruflags t1, t0
+};
+
+def macroop CMC {
+ ruflags t1
+ wruflagsi t1, "CFBit"
+};
+'''
#let {{
-# class CLC(Inst):
-# "GenFault ${new UnimpInstFault}"
-# class CMC(Inst):
-# "GenFault ${new UnimpInstFault}"
-# class STC(Inst):
-# "GenFault ${new UnimpInstFault}"
-# class CLD(Inst):
-# "GenFault ${new UnimpInstFault}"
-# class STD(Inst):
-# "GenFault ${new UnimpInstFault}"
# class CLI(Inst):
# "GenFault ${new UnimpInstFault}"
# class STI(Inst):
diff --git a/src/arch/x86/isa/insts/semaphores.py b/src/arch/x86/isa/insts/semaphores.py
index 882213a3f..800f1b325 100644
--- a/src/arch/x86/isa/insts/semaphores.py
+++ b/src/arch/x86/isa/insts/semaphores.py
@@ -80,12 +80,6 @@ def macroop CMPXCHG_P_R {
};
'''
#let {{
-# class CMPXCHG(Inst):
-# "GenFault ${new UnimpInstFault}"
-# class CMPXCHG8B(Inst):
-# "GenFault ${new UnimpInstFault}"
-# class CMPXCHG16B(Inst):
-# "GenFault ${new UnimpInstFault}"
# class XADD(Inst):
# "GenFault ${new UnimpInstFault}"
# class XCHG(Inst):
diff --git a/src/arch/x86/isa/microops/regop.isa b/src/arch/x86/isa/microops/regop.isa
index 3c562efc0..ac88be657 100644
--- a/src/arch/x86/isa/microops/regop.isa
+++ b/src/arch/x86/isa/microops/regop.isa
@@ -615,8 +615,12 @@ let {{
''')
defineMicroRegOpWr('Wrip', 'RIP = psrc1 + op2', elseCode="RIP = RIP;")
+ defineMicroRegOpWr('Wruflags', 'ccFlagBits = psrc1 ^ op2')
defineMicroRegOpRd('Rdip', 'DestReg = RIP')
+ defineMicroRegOpRd('Ruflags', 'DestReg = ccFlagBits')
+ defineMicroRegOpImm('Ruflag', 'DestReg = bits(ccFlagBits, imm8);', \
+ flagCode = genCCFlagBitsLogic)
defineMicroRegOpImm('Sext', '''
IntReg val = psrc1;
diff --git a/src/arch/x86/isa/specialize.isa b/src/arch/x86/isa/specialize.isa
index 690061de7..59e9577d9 100644
--- a/src/arch/x86/isa/specialize.isa
+++ b/src/arch/x86/isa/specialize.isa
@@ -176,6 +176,10 @@ let {{
# Non register modrm settings should cause an error
env.addReg(ModRMRMIndex)
Name += "_R"
+ elif opType.tag in ("X", "Y"):
+ # This type of memory addressing is for string instructions.
+ # They'll use the right index and segment internally.
+ Name += "_M"
else:
raise Exception, "Unrecognized tag %s." % opType.tag