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| author | Nikos Nikoleris <nikos.nikoleris@gmail.com> | 2015-07-04 10:43:47 -0500 |
|---|---|---|
| committer | Nikos Nikoleris <nikos.nikoleris@gmail.com> | 2015-07-04 10:43:47 -0500 |
| commit | 67925a833445a8b2ddce0fae4c86677ce0f4298d (patch) | |
| tree | ab50d5047d928846e502719401df0b7d1df96c06 /src/arch/x86/isa | |
| parent | 64af6dafb1edd1287185d3e15c9071836e02b578 (diff) | |
| download | gem5-67925a833445a8b2ddce0fae4c86677ce0f4298d.tar.xz | |
x86: Adjust the size of the values written to the x87 misc registers
All x87 misc registers are implemented in an array of 64 bit values
but in real hardware the size of some of these registers is smaller.
Previsouly all 64 bits where incorrectly set and then later read. To
ensure correctness we mask the value in setMiscRegNoEffect to write
only the valid bits.
Committed by: Nilay Vaish <nilay@cs.wisc.edu>
Diffstat (limited to 'src/arch/x86/isa')
| -rw-r--r-- | src/arch/x86/isa/insts/simd128/integer/save_and_restore_state/save_and_restore_state.py | 3 | ||||
| -rw-r--r-- | src/arch/x86/isa/insts/x87/control/save_and_restore_x87_environment.py | 3 |
2 files changed, 0 insertions, 6 deletions
diff --git a/src/arch/x86/isa/insts/simd128/integer/save_and_restore_state/save_and_restore_state.py b/src/arch/x86/isa/insts/simd128/integer/save_and_restore_state/save_and_restore_state.py index 1017d519f..2b9ad756e 100644 --- a/src/arch/x86/isa/insts/simd128/integer/save_and_restore_state/save_and_restore_state.py +++ b/src/arch/x86/isa/insts/simd128/integer/save_and_restore_state/save_and_restore_state.py @@ -122,9 +122,6 @@ fxrstorCommonTemplate = """ # FSW includes TOP when read ld t1, seg, %(mode)s, "DISPLACEMENT + 2", dataSize=2 wrval fsw, t1 - srli t1, t1, 11, dataSize=2 - andi t1, t1, 0x7, dataSize=2 - wrval "InstRegIndex(MISCREG_X87_TOP)", t1 # FTW ld t1, seg, %(mode)s, "DISPLACEMENT + 4", dataSize=1 diff --git a/src/arch/x86/isa/insts/x87/control/save_and_restore_x87_environment.py b/src/arch/x86/isa/insts/x87/control/save_and_restore_x87_environment.py index 44c44062b..20ecff43a 100644 --- a/src/arch/x86/isa/insts/x87/control/save_and_restore_x87_environment.py +++ b/src/arch/x86/isa/insts/x87/control/save_and_restore_x87_environment.py @@ -36,9 +36,6 @@ fldenvTemplate = """ ld t1, seg, %(mode)s, "DISPLACEMENT + 4", dataSize=2 wrval fsw, t1 - srli t1, t1, 11, dataSize=2 - andi t1, t1, 0x7, dataSize=2 - wrval "InstRegIndex(MISCREG_X87_TOP)", t1 ld t1, seg, %(mode)s, "DISPLACEMENT + 8", dataSize=2 wrval ftw, t1 |