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authorGabe Black <gblack@eecs.umich.edu>2009-04-19 03:42:41 -0700
committerGabe Black <gblack@eecs.umich.edu>2009-04-19 03:42:41 -0700
commit038225a6cae8ce1d8fc5246440b7f697eeb3c90a (patch)
tree6130b37812c98e1c7413acee8a8ca45b5469d0dc /src/arch/x86/isa
parent3b1b21cb159c0368d50aa0dedd39a8874d91e735 (diff)
downloadgem5-038225a6cae8ce1d8fc5246440b7f697eeb3c90a.tar.xz
X86: Implement far jmp.
Diffstat (limited to 'src/arch/x86/isa')
-rw-r--r--src/arch/x86/isa/decoder/one_byte_opcodes.isa13
-rw-r--r--src/arch/x86/isa/insts/general_purpose/control_transfer/jump.py99
-rw-r--r--src/arch/x86/isa/microops/regop.isa7
3 files changed, 116 insertions, 3 deletions
diff --git a/src/arch/x86/isa/decoder/one_byte_opcodes.isa b/src/arch/x86/isa/decoder/one_byte_opcodes.isa
index 817986232..84d18441d 100644
--- a/src/arch/x86/isa/decoder/one_byte_opcodes.isa
+++ b/src/arch/x86/isa/decoder/one_byte_opcodes.isa
@@ -519,7 +519,10 @@
0x1: JMP(Jz);
0x2: decode MODE_SUBMODE {
0x0: UD2();
- default: WarnUnimpl::jmp_far_Ap();
+ 0x1: JMP_FAR(Iz);
+ 0x2: JMP_FAR(Iz);
+ 0x3: JMP_FAR_REAL(Iz);
+ 0x4: JMP_FAR_REAL(Iz);
}
0x3: JMP(Jb);
0x4: IN(rAb,rD);
@@ -581,7 +584,13 @@
0x2: CALL_NEAR(Ev);
0x3: WarnUnimpl::call_far_Mp();
0x4: JMP(Ev);
- 0x5: WarnUnimpl::jmp_far_Mp();
+ 0x5: decode MODE_SUBMODE {
+ 0x0: JMP_FAR(Mz);
+ 0x1: JMP_FAR(Mz);
+ 0x2: JMP_FAR(Mz);
+ 0x3: JMP_FAR_REAL(Mz);
+ 0x4: JMP_FAR_REAL(Mz);
+ }
0x6: PUSH(Ev);
0x7: UD2();
}
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
+};
'''
diff --git a/src/arch/x86/isa/microops/regop.isa b/src/arch/x86/isa/microops/regop.isa
index 35227a4fb..6935c780d 100644
--- a/src/arch/x86/isa/microops/regop.isa
+++ b/src/arch/x86/isa/microops/regop.isa
@@ -1102,7 +1102,12 @@ let {{
case SegNoCheck:
break;
case SegCSCheck:
- panic("CS checks for far calls/jumps not implemented.\\n");
+ // Make sure it's the right type
+ if (desc.s == 0 || desc.type.codeOrData != 1) {
+ fault = new GeneralProtection(0);
+ } else if (m5reg.cpl != desc.dpl) {
+ fault = new GeneralProtection(0);
+ }
break;
case SegCallGateCheck:
panic("CS checks for far calls/jumps through call gates"