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x86: LOOP's operand size defaults to 64 bits in 64 bit mode.

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The microcode for those instructions needs a directive which overrides
that setting in the instructions emulation environment.

Reported-by: Matt Sinclair <mattdsinclair@gmail.com>

Change-Id: I474d938c0b3cf01da92ec817a58b08de783f1967
Reviewed-on: https://gem5-review.googlesource.com/6301
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
This commit is contained in:
Gabe Black
2017-12-04 18:30:41 -08:00
parent f19bb4e88d
commit 855660f9c7
1 changed files with 6 additions and 0 deletions
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6
src/arch/x86/isa/insts/general_purpose/control_transfer/loop.py
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@@ -37,18 +37,24 @@
microcode = '''
def macroop LOOP_I {
# Make the default data size of pops 64 bits in 64 bit mode
.adjust_env oszIn64Override
rdip t1
subi rcx, rcx, 1, flags=(EZF,), dataSize=asz
wripi t1, imm, flags=(nCEZF,)
};
def macroop LOOPNE_I {
# Make the default data size of pops 64 bits in 64 bit mode
.adjust_env oszIn64Override
rdip t1
subi rcx, rcx, 1, flags=(EZF,), dataSize=asz
wripi t1, imm, flags=(CSTRnZnEZF,)
};
def macroop LOOPE_I {
# Make the default data size of pops 64 bits in 64 bit mode
.adjust_env oszIn64Override
rdip t1
subi rcx, rcx, 1, flags=(EZF,), dataSize=asz
wripi t1, imm, flags=(CSTRZnEZF,)