Store-Release Exclusive Pair of registers stores two 32-bit words or two 64-bit doublewords to a memory location if the PE has exclusive access to the memory address, from two registers, and returns a status value of 0 if the store was successful, or of 1 if no store was performed. See Synchronization and semaphores. A 32-bit pair requires the address to be doubleword aligned and is single-copy atomic at doubleword granularity. A 64-bit pair requires the address to be quadword aligned and, if the Store-Exclusive succeeds, it causes a single-copy atomic update of the 128-bit memory location being updated. The instruction also has memory ordering semantics as described in Load-Acquire, Store-Release. For information about memory accesses see Load/Store addressing modes.
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
1 | sz | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | Rs | 1 | Rt2 | Rn | Rt | ||||||||||||||||
L | o0 |
integer n = UInt(Rn); integer t = UInt(Rt); integer t2 = UInt(Rt2); // ignored by load/store single register integer s = UInt(Rs); // ignored by all loads and store-release integer elsize = 32 << UInt(sz); integer datasize = elsize * 2; boolean tag_checked = n != 31;
For information about the constrained unpredictable behavior of this instruction, see Architectural Constraints on UNPREDICTABLE behaviors, and particularly STLXP.
<Xt1> |
Is the 64-bit name of the first general-purpose register to be transferred, encoded in the "Rt" field. |
<Xt2> |
Is the 64-bit name of the second general-purpose register to be transferred, encoded in the "Rt2" field. |
<Wt1> |
Is the 32-bit name of the first general-purpose register to be transferred, encoded in the "Rt" field. |
<Wt2> |
Is the 32-bit name of the second general-purpose register to be transferred, encoded in the "Rt2" field. |
<Xn|SP> |
Is the 64-bit name of the general-purpose base register or stack pointer, encoded in the "Rn" field. |
Aborts and alignment
If a synchronous Data Abort exception is generated by the execution of this instruction:
Accessing an address that is not aligned to the size of the data being accessed causes an Alignment fault Data Abort exception to be generated, subject to the following rules:
If AArch64.ExclusiveMonitorsPass() returns FALSE and the memory address, if accessed, would generate a synchronous Data Abort exception, it is implementation defined whether the exception is generated.
bits(64) address; bits(datasize) data; constant integer dbytes = datasize DIV 8; boolean rt_unknown = FALSE; boolean rn_unknown = FALSE; if HaveMTEExt() then SetNotTagCheckedInstruction(!tag_checked); if s == t || (s == t2) then Constraint c = ConstrainUnpredictable(Unpredictable_DATAOVERLAP); assert c IN {Constraint_UNKNOWN, Constraint_NONE, Constraint_UNDEF, Constraint_NOP}; case c of when Constraint_UNKNOWN rt_unknown = TRUE; // store UNKNOWN value when Constraint_NONE rt_unknown = FALSE; // store original value when Constraint_UNDEF UNDEFINED; when Constraint_NOP EndOfInstruction(); if s == n && n != 31 then Constraint c = ConstrainUnpredictable(Unpredictable_BASEOVERLAP); assert c IN {Constraint_UNKNOWN, Constraint_NONE, Constraint_UNDEF, Constraint_NOP}; case c of when Constraint_UNKNOWN rn_unknown = TRUE; // address is UNKNOWN when Constraint_NONE rn_unknown = FALSE; // address is original base when Constraint_UNDEF UNDEFINED; when Constraint_NOP EndOfInstruction(); if n == 31 then CheckSPAlignment(); address = SP[]; elsif rn_unknown then address = bits(64) UNKNOWN; else address = X[n]; if rt_unknown then data = bits(datasize) UNKNOWN; else bits(datasize DIV 2) el1 = X[t]; bits(datasize DIV 2) el2 = X[t2]; data = if BigEndian() then el1:el2 else el2:el1; bit status = '1'; // Check whether the Exclusives monitors are set to include the // physical memory locations corresponding to virtual address // range [address, address+dbytes-1]. if AArch64.ExclusiveMonitorsPass(address, dbytes) then // This atomic write will be rejected if it does not refer // to the same physical locations after address translation. Mem[address, dbytes, AccType_ORDEREDATOMIC] = data; status = ExclusiveMonitorsStatus(); X[s] = ZeroExtend(status, 32);
If PSTATE.DIT is 1, the timing of this instruction is insensitive to the value of the data being loaded or stored.
Internal version only: isa v30.41, AdvSIMD v27.08, pseudocode r8p5_00bet2_rc5, sve v8.5-00bet10_rc5 ; Build timestamp: 2019-03-28T07:14
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