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X86: Implement the CMPXCHG8B/CMPXCHG16B instruction.

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This commit is contained in:
Gabe Black 2009-08-09 01:01:41 -07:00
parent bbf117b20e
commit c5fae51774
3 changed files with 98 additions and 2 deletions
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3
src/arch/x86/isa/decoder/locked_opcodes.isa
View file

@ -160,7 +160,8 @@
0x1: XADD_LOCKED(Mv,Gv);
//0x7: group9();
0x7: decode MODRM_REG {
0x1: WarnUnimpl::cmpxchg_Mq_LOCKED();
//Also CMPXCHG16B
0x1: CMPXCHG8B_LOCKED(Mdp);
}
}
}

3
src/arch/x86/isa/decoder/two_byte_opcodes.isa
View file

@ -898,7 +898,8 @@
0x1: Inst::XADD(Ev,Gv);
//0x7: group9();
0x7: decode MODRM_REG {
0x1: cmpxchg_Mq();
//Also CMPXCHG16B
0x1: Inst::CMPXCHG8B(Mdp);
0x6: decode LEGACY_OP {
0x1: vmclear_Mq();
default: decode LEGACY_REP {

94
src/arch/x86/isa/insts/general_purpose/semaphores.py
View file

@ -98,6 +98,100 @@ def macroop CMPXCHG_LOCKED_P_R {
mov rax, rax, t1, flags=(nCZF,)
};
def macroop CMPXCHG8B_M {
lea t1, seg, sib, disp, dataSize=asz
ldst t2, seg, [1, t0, t1], 0
ldst t3, seg, [1, t0, t1], dsz
sub t0, rax, t2, flags=(ZF,)
br label("doneComparing"), flags=(nCZF,)
sub t0, rdx, t3, flags=(ZF,)
doneComparing:
# If they're equal, set t3:t2 to rbx:rcx to write to memory
mov t2, t2, rbx, flags=(CZF,)
mov t3, t3, rcx, flags=(CZF,)
# If they're not equal, set rdx:rax to the value from memory.
mov rax, rax, t2, flags=(nCZF,)
mov rdx, rdx, t3, flags=(nCZF,)
# Write to memory
st t3, seg, [1, t0, t1], dsz
st t2, seg, [1, t0, t1], 0
};
def macroop CMPXCHG8B_P {
rdip t7
lea t1, seg, riprel, disp, dataSize=asz
ldst t2, seg, [1, t0, t1], 0
ldst t3, seg, [1, t0, t1], dsz
sub t0, rax, t2, flags=(ZF,)
br label("doneComparing"), flags=(nCZF,)
sub t0, rdx, t3, flags=(ZF,)
doneComparing:
# If they're equal, set t3:t2 to rbx:rcx to write to memory
mov t2, t2, rbx, flags=(CZF,)
mov t3, t3, rcx, flags=(CZF,)
# If they're not equal, set rdx:rax to the value from memory.
mov rax, rax, t2, flags=(nCZF,)
mov rdx, rdx, t3, flags=(nCZF,)
# Write to memory
st t3, seg, [1, t0, t1], dsz
st t2, seg, [1, t0, t1], 0
};
def macroop CMPXCHG8B_LOCKED_M {
lea t1, seg, sib, disp, dataSize=asz
ldstl t2, seg, [1, t0, t1], 0
ldstl t3, seg, [1, t0, t1], dsz
sub t0, rax, t2, flags=(ZF,)
br label("doneComparing"), flags=(nCZF,)
sub t0, rdx, t3, flags=(ZF,)
doneComparing:
# If they're equal, set t3:t2 to rbx:rcx to write to memory
mov t2, t2, rbx, flags=(CZF,)
mov t3, t3, rcx, flags=(CZF,)
# If they're not equal, set rdx:rax to the value from memory.
mov rax, rax, t2, flags=(nCZF,)
mov rdx, rdx, t3, flags=(nCZF,)
# Write to memory
stul t3, seg, [1, t0, t1], dsz
stul t2, seg, [1, t0, t1], 0
};
def macroop CMPXCHG8B_LOCKED_P {
rdip t7
lea t1, seg, riprel, disp, dataSize=asz
ldstl t2, seg, [1, t0, t1], 0
ldstl t3, seg, [1, t0, t1], dsz
sub t0, rax, t2, flags=(ZF,)
br label("doneComparing"), flags=(nCZF,)
sub t0, rdx, t3, flags=(ZF,)
doneComparing:
# If they're equal, set t3:t2 to rbx:rcx to write to memory
mov t2, t2, rbx, flags=(CZF,)
mov t3, t3, rcx, flags=(CZF,)
# If they're not equal, set rdx:rax to the value from memory.
mov rax, rax, t2, flags=(nCZF,)
mov rdx, rdx, t3, flags=(nCZF,)
# Write to memory
stul t3, seg, [1, t0, t1], dsz
stul t2, seg, [1, t0, t1], 0
};
def macroop XADD_M_R {
ldst t1, seg, sib, disp
add t2, t1, reg, flags=(OF,SF,ZF,AF,PF,CF)