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| author | Gabe Black <gblack@eecs.umich.edu> | 2009-08-09 01:01:41 -0700 |
|---|---|---|
| committer | Gabe Black <gblack@eecs.umich.edu> | 2009-08-09 01:01:41 -0700 |
| commit | c5fae517748420efd346149641ed69f53747ee16 (patch) | |
| tree | 3ca8395860eed8f99a18b713d7a4d1bff52ab09c /src/arch/x86/isa/insts/general_purpose | |
| parent | bbf117b20e32ca827ee3b00b019d3a88f39f9cec (diff) | |
| download | gem5-c5fae517748420efd346149641ed69f53747ee16.tar.xz | |
X86: Implement the CMPXCHG8B/CMPXCHG16B instruction.
Diffstat (limited to 'src/arch/x86/isa/insts/general_purpose')
| -rw-r--r-- | src/arch/x86/isa/insts/general_purpose/semaphores.py | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/src/arch/x86/isa/insts/general_purpose/semaphores.py b/src/arch/x86/isa/insts/general_purpose/semaphores.py index a7da0720e..2bdbd0ada 100644 --- a/src/arch/x86/isa/insts/general_purpose/semaphores.py +++ b/src/arch/x86/isa/insts/general_purpose/semaphores.py @@ -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) |