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authorGabe Black <gblack@eecs.umich.edu>2009-08-17 18:15:00 -0700
committerGabe Black <gblack@eecs.umich.edu>2009-08-17 18:15:00 -0700
commit3f2f3bede87ae225418e2d54c283662f9c476590 (patch)
treef2892a7ea064f4198ff9e675db8f0ab073632797 /src
parenta43ae579dd3128a0ced2238532f26d99db197361 (diff)
downloadgem5-3f2f3bede87ae225418e2d54c283662f9c476590.tar.xz
X86: Turn the CMPXCHG8B microcode into a template and generate each variant.
Diffstat (limited to 'src')
-rw-r--r--src/arch/x86/isa/insts/general_purpose/semaphores.py134
1 files changed, 40 insertions, 94 deletions
diff --git a/src/arch/x86/isa/insts/general_purpose/semaphores.py b/src/arch/x86/isa/insts/general_purpose/semaphores.py
index 2bdbd0ada..b3c0d21cb 100644
--- a/src/arch/x86/isa/insts/general_purpose/semaphores.py
+++ b/src/arch/x86/isa/insts/general_purpose/semaphores.py
@@ -98,100 +98,6 @@ 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)
@@ -229,6 +135,46 @@ def macroop XADD_R_R {
};
'''
+
+cmpxchg8bCode = '''
+def macroop CMPXCHG8B_%(suffix)s {
+ %(rdip)s
+ lea t1, seg, %(sib)s, disp, dataSize=asz
+ ldst%(l)s t2, seg, [1, t0, t1], 0
+ ldst%(l)s 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%(ul)s t3, seg, [1, t0, t1], dsz
+ st%(ul)s t2, seg, [1, t0, t1], 0
+};
+'''
+
+microcode += cmpxchg8bCode % {"rdip": "", "sib": "sib",
+ "l": "", "ul": "",
+ "suffix": "M"}
+microcode += cmpxchg8bCode % {"rdip": "rdip t7", "sib": "riprel",
+ "l": "", "ul": "",
+ "suffix": "P"}
+microcode += cmpxchg8bCode % {"rdip": "", "sib": "sib",
+ "l": "l", "ul": "ul",
+ "suffix": "LOCKED_M"}
+microcode += cmpxchg8bCode % {"rdip": "rdip t7", "sib": "riprel",
+ "l": "l", "ul": "ul",
+ "suffix": "LOCKED_P"}
+
#let {{
# class XCHG(Inst):
# "GenFault ${new UnimpInstFault}"