changeset 3d7f94358641 in /z/repo/m5
details: http://repo.m5sim.org/m5?cmd=changeset;node=3d7f94358641
description:
X86: Make exceptions handle stack switching.
diffstat:
1 file changed, 17 insertions(+), 16 deletions(-)
src/arch/x86/isa/insts/romutil.py | 33 +++++++++++++++++----------------
diffs (61 lines):
diff -r 7a323daa3df2 -r 3d7f94358641 src/arch/x86/isa/insts/romutil.py
--- a/src/arch/x86/isa/insts/romutil.py Wed Feb 25 10:17:14 2009 -0800
+++ b/src/arch/x86/isa/insts/romutil.py Wed Feb 25 10:17:19 2009 -0800
@@ -80,22 +80,34 @@
andi t10, t10, 3, dataSize=8
rdattr t5, cs, dataSize=8
srli t5, t5, 3, dataSize=8
- sub t5, t5, t10, dataSize=8
- andi t0, t5, 0x3, flags=(EZF,), dataSize=8
+ andi t5, t5, 0x3, dataSize=8
+ sub t0, t5, t10, flags=(EZF,), dataSize=8
# We're going to change priviledge, so zero out the stack selector. We
# need to let the IST have priority so we don't branch yet.
wrsel t11, t0, flags=(nCEZF,)
# Check the IST field of the gate descriptor
- srli t10, t4, 32, dataSize=8
- andi t10, t10, 0x7, dataSize=8
- subi t0, t10, 1, flags=(ECF,), dataSize=8
+ srli t12, t4, 32, dataSize=8
+ andi t12, t12, 0x7, dataSize=8
+ subi t0, t12, 1, flags=(ECF,), dataSize=8
br rom_local_label("%(startLabel)s_istStackSwitch"), flags=(nCECF,)
br rom_local_label("%(startLabel)s_cplStackSwitch"), flags=(nCEZF,)
# If we're here, it's because the stack isn't being switched.
# Set t6 to the new aligned rsp.
mov t6, t6, rsp, dataSize=8
+ br rom_local_label("%(startLabel)s_stackSwitched")
+
+%(startLabel)s_istStackSwitch:
+ panic "IST based stack switching isn't implemented"
+ br rom_local_label("%(startLabel)s_stackSwitched")
+
+%(startLabel)s_cplStackSwitch:
+ # Get the new rsp from the TSS
+ ld t6, tr, [8, t10, t0], 4, dataSize=8, addressSize=8
+
+%(startLabel)s_stackSwitched:
+
andi t6, t6, 0xF0, dataSize=1
subi t6, t6, 40 + %(errorCodeSize)d, dataSize=8
@@ -103,17 +115,6 @@
ldst t0, hs, [1, t0, t6], dataSize=8, addressSize=8
ldst t0, hs, [1, t0, t6], \
32 + %(errorCodeSize)d, dataSize=8, addressSize=8
- br rom_local_label("%(startLabel)s_stackSwitched")
-
-%(startLabel)s_istStackSwitch:
- panic "IST based stack switching isn't implemented"
- br rom_local_label("%(startLabel)s_stackSwitched")
-
-%(startLabel)s_cplStackSwitch:
- panic "CPL change initiated stack switching isn't implemented"
-
-%(startLabel)s_stackSwitched:
-
##
## Point of no return.
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