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authorGabe Black <gblack@eecs.umich.edu>2008-10-12 15:53:04 -0700
committerGabe Black <gblack@eecs.umich.edu>2008-10-12 15:53:04 -0700
commit6fd4eff68f53ec1cd9194581bfa223bfbaa2d83d (patch)
treec7cde083a711fb3429f6c6d499c7894507c5acf1 /src/arch
parent4aa18aa80022d9e4125faab8ff1f5123e159137d (diff)
downloadgem5-6fd4eff68f53ec1cd9194581bfa223bfbaa2d83d.tar.xz
X86: Create an eret microop which returns from ROM to combinational decoding.
Diffstat (limited to 'src/arch')
-rw-r--r--src/arch/x86/isa/microops/seqop.isa33
1 files changed, 33 insertions, 0 deletions
diff --git a/src/arch/x86/isa/microops/seqop.isa b/src/arch/x86/isa/microops/seqop.isa
index 603f4458b..d3c7bf096 100644
--- a/src/arch/x86/isa/microops/seqop.isa
+++ b/src/arch/x86/isa/microops/seqop.isa
@@ -198,6 +198,25 @@ let {{
microFlags = (is_micro, is_delayed, is_first, is_last)
return super(Br, self).getAllocator(*microFlags)
+ class Eret(SeqOp):
+ target = "normalMicroPC(0)"
+ className = "Eret"
+
+ def __init__(self, flags=None):
+ if flags:
+ if not isinstance(flags, (list, tuple)):
+ raise Exception, "flags must be a list or tuple of flags"
+ self.cond = " | ".join(flags)
+ self.className += "Flags"
+ else:
+ self.cond = "0"
+
+ def getAllocator(self, *microFlags):
+ (is_micro, is_delayed, is_first, is_last) = microFlags
+ is_last = True
+ microFlags = (is_micro, is_delayed, is_first, is_last)
+ return super(Eret, self).getAllocator(*microFlags)
+
iop = InstObjParams("br", "MicroBranchFlags", "SeqOpBase",
{"code": "nuIP = target",
"else_code": "nuIP = nuIP",
@@ -213,4 +232,18 @@ let {{
header_output += SeqOpDeclare.subst(iop)
decoder_output += SeqOpConstructor.subst(iop)
microopClasses["br"] = Br
+
+ iop = InstObjParams("eret", "EretFlags", "SeqOpBase",
+ {"code": "", "else_code": "",
+ "cond_test": "checkCondition(ccFlagBits, cc)"})
+ exec_output += SeqOpExecute.subst(iop)
+ header_output += SeqOpDeclare.subst(iop)
+ decoder_output += SeqOpConstructor.subst(iop)
+ iop = InstObjParams("eret", "Eret", "SeqOpBase",
+ {"code": "", "else_code": "",
+ "cond_test": "true"})
+ exec_output += SeqOpExecute.subst(iop)
+ header_output += SeqOpDeclare.subst(iop)
+ decoder_output += SeqOpConstructor.subst(iop)
+ microopClasses["eret"] = Eret
}};