Gabe Black has uploaded this change for review. (
https://gem5-review.googlesource.com/c/public/gem5/+/55286 )
Change subject: arch-x86: Fix immediate based IN instructions.
......................................................................
arch-x86: Fix immediate based IN instructions.
These were loading the immediate into a temporary microcode register
which would then be used to calculate the address to actually send to
the memory system. Unfortunately this was using a data size equal to the
address size, which would mean that the immediate would be merged into
that temporary, leaving previously set bits intact. The data size
*should* have been set to 8, and was already in other similar
instructions. That forces the limm microop to overwrite the temporary
entirely.
Change-Id: I87c82b4677db768ccb6401a3dbda61317c014152
---
M src/arch/x86/isa/insts/general_purpose/input_output/general_io.py
1 file changed, 19 insertions(+), 1 deletion(-)
diff --git
a/src/arch/x86/isa/insts/general_purpose/input_output/general_io.py
b/src/arch/x86/isa/insts/general_purpose/input_output/general_io.py
index 27396e2..58b38e5 100644
--- a/src/arch/x86/isa/insts/general_purpose/input_output/general_io.py
+++ b/src/arch/x86/isa/insts/general_purpose/input_output/general_io.py
@@ -39,7 +39,7 @@
microcode = '''
def macroop IN_R_I {
.adjust_imm trimImm(8)
- limm t1, imm, dataSize=asz
+ limm t1, imm, dataSize=8
mfence
ld reg, intseg, [1, t1, t0], "IntAddrPrefixIO << 3",
addressSize=8, \
nonSpec=True
--
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Gerrit-Project: public/gem5
Gerrit-Branch: develop
Gerrit-Change-Id: I87c82b4677db768ccb6401a3dbda61317c014152
Gerrit-Change-Number: 55286
Gerrit-PatchSet: 1
Gerrit-Owner: Gabe Black <[email protected]>
Gerrit-MessageType: newchange
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