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ARM: Implement the enterx and leavex instructions.

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These enter and leave thumbEE mode. Currently thumbEE mode behaves exactly the
same as Thumb mode, but at least this will make it -look- like we're enter and
leaving it. The actual behavioral changes will be implemented in future
changes.
This commit is contained in:
Gabe Black
2010-06-02 12:58:09 -05:00
parent eb0823c4f2
commit 6a4ea7cca9
1 changed files with 20 additions and 0 deletions
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20
src/arch/arm/isa/insts/misc.isa
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@@ -514,4 +514,24 @@ let {{
header_output += RegRegOpDeclare.subst(mcr15Iop)
decoder_output += RegRegOpConstructor.subst(mcr15Iop)
exec_output += PredOpExecute.subst(mcr15Iop)
enterxCode = '''
FNPC = NPC | (1ULL << PcJBitShift) | (1ULL << PcTBitShift);
'''
enterxIop = InstObjParams("enterx", "Enterx", "PredOp",
{ "code": enterxCode,
"predicate_test": predicateTest }, [])
header_output += BasicDeclare.subst(enterxIop)
decoder_output += BasicConstructor.subst(enterxIop)
exec_output += PredOpExecute.subst(enterxIop)
leavexCode = '''
FNPC = (NPC & ~(1ULL << PcJBitShift)) | (1ULL << PcTBitShift);
'''
leavexIop = InstObjParams("leavex", "Leavex", "PredOp",
{ "code": leavexCode,
"predicate_test": predicateTest }, [])
header_output += BasicDeclare.subst(leavexIop)
decoder_output += BasicConstructor.subst(leavexIop)
exec_output += PredOpExecute.subst(leavexIop)
}};