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-rw-r--r--src/arch/x86/isa/insts/general_purpose/control_transfer/jump.py99
1 files changed, 99 insertions, 0 deletions
diff --git a/src/arch/x86/isa/insts/general_purpose/control_transfer/jump.py b/src/arch/x86/isa/insts/general_purpose/control_transfer/jump.py
index bb3ae4213..4f0cdf770 100644
--- a/src/arch/x86/isa/insts/general_purpose/control_transfer/jump.py
+++ b/src/arch/x86/isa/insts/general_purpose/control_transfer/jump.py
@@ -90,4 +90,103 @@ def macroop JMP_P
ld t1, seg, riprel, disp
wripi t1, 0
};
+
+def macroop JMP_FAR_M
+{
+ limm t1, 0, dataSize=8
+ limm t2, 0, dataSize=8
+ lea t1, seg, sib, disp, dataSize=asz
+ ld t2, seg, [1, t0, t1], dsz
+ ld t1, seg, [1, t0, t1]
+ br rom_label("jmpFarWork")
+};
+
+def macroop JMP_FAR_P
+{
+ limm t1, 0, dataSize=8
+ limm t2, 0, dataSize=8
+ rdip t7, dataSize=asz
+ lea t1, seg, riprel, disp, dataSize=asz
+ ld t2, seg, [1, t0, t1], dsz
+ ld t1, seg, [1, t0, t1]
+ br rom_label("jmpFarWork")
+};
+
+def macroop JMP_FAR_I
+{
+ # Put the whole far pointer into a register.
+ limm t2, imm, dataSize=8
+ # Figure out the width of the offset.
+ limm t3, dsz, dataSize=8
+ sll t3, t3, 3, dataSize=8
+ # Get the selector into t1.
+ sll t1, t2, t3, dataSize=8
+ mov t1, t0, t1, dataSize=2
+ # And get the offset into t2
+ mov t2, t0, t2
+ br rom_label("jmpFarWork")
+};
+
+def rom
+{
+ extern jmpFarWork:
+ # t1 has the offset and t2 has the new selector.
+ # This is intended to run in protected mode.
+ andi t0, t2, 0xFC, flags=(EZF,), dataSize=2
+ fault "new GeneralProtection(0)", flags=(CEZF,)
+ andi t3, t2, 0xF8, dataSize=8
+ andi t0, t2, 0x4, flags=(EZF,), dataSize=2
+ br rom_local_label("farJmpGlobalDescriptor"), flags=(CEZF,)
+ ld t4, tsl, [1, t0, t3], dataSize=8, addressSize=8, atCPL0=True
+ br rom_local_label("farJmpProcessDescriptor")
+farJmpGlobalDescriptor:
+ ld t4, tsg, [1, t0, t3], dataSize=8, addressSize=8, atCPL0=True
+farJmpProcessDescriptor:
+ rcri t0, t4, 13, flags=(ECF,), dataSize=2
+ br rom_local_label("farJmpSystemDescriptor"), flags=(nCECF,)
+ chks t2, t4, CSCheck, dataSize=8
+ wrdl cs, t4, t2
+ wrsel cs, t2
+ wrip t0, t1
+ eret
+
+farJmpSystemDescriptor:
+ panic "Far jumps to system descriptors aren't implemented"
+ eret
+};
+
+def macroop JMP_FAR_REAL_M
+{
+ lea t1, seg, sib, disp, dataSize=asz
+ ld t2, seg, [1, t0, t1], dsz
+ ld t1, seg, [1, t0, t1]
+ zexti t3, t1, 15, dataSize=8
+ slli t3, t3, 4, dataSize=8
+ wrsel cs, t1, dataSize=2
+ wrbase cs, t3
+ wrip t0, t2, dataSize=asz
+};
+
+def macroop JMP_FAR_REAL_P
+{
+ panic "Real mode far jump executed in 64 bit mode!"
+};
+
+def macroop JMP_FAR_REAL_I
+{
+ # Put the whole far pointer into a register.
+ limm t2, imm, dataSize=8
+ # Figure out the width of the offset.
+ limm t3, dsz, dataSize=8
+ sll t3, t3, 3, dataSize=8
+ # Get the selector into t1.
+ sll t1, t2, t3, dataSize=8
+ mov t1, t0, t1, dataSize=2
+ # And get the offset into t2
+ mov t2, t0, t2
+ slli t3, t3, 4, dataSize=8
+ wrsel cs, t1, dataSize=2
+ wrbase cs, t3
+ wrip t0, t2, dataSize=asz
+};
'''