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[RTL] Improve / fix the SList code
Don't push a register in the middle of a an asm function. Instead add a proper prolog and store rbx in a home param slot.
This commit is contained in:
Timo Kreuzer
parent
0520c75aaf
commit
65c3911ffc
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@ -83,17 +83,18 @@ PUBLIC ExpInterlockedPopEntrySListEnd16
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PUBLIC ExpInterlockedPushEntrySList
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PUBLIC ExpInterlockedFlushSList
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PUBLIC RtlInterlockedFlushSList
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PUBLIC RtlInterlockedPopEntrySList
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PUBLIC RtlInterlockedPushEntrySList
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PUBLIC RtlInterlockedFlushSList
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/* PSLIST_ENTRY
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* NTAPI
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* RtlInterlockedPopEntrySList(
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* IN PSLIST_HEADER ListHead);
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*/
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RtlInterlockedPopEntrySList:
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ExpInterlockedPopEntrySList:
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FUNC RtlInterlockedPopEntrySList
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.ENDPROLOG
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/* Load ListHead->Region into rdx */
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mov rdx, [rcx + 8]
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@ -106,8 +107,7 @@ ExpInterlockedPopEntrySList:
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jne RtlInterlockedPopEntrySList16
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/* Use the 8 byte header */
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ExpInterlockedPopEntrySListResume:
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GLOBAL_LABEL ExpInterlockedPopEntrySListResume
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/* Check if ListHead->NextEntry is NULL */
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mov r9, rax
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@ -128,7 +128,7 @@ ExpInterlockedPopEntrySListResume:
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/* Combine to new pointer in rdx */
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or rdx, r9
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ExpInterlockedPopEntrySListFault:
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GLOBAL_LABEL ExpInterlockedPopEntrySListFault
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/* Load the next NextEntry pointer to r9 */
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mov r9, [rdx]
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@ -139,7 +139,7 @@ ExpInterlockedPopEntrySListFault:
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/* Combine into r8 */
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or r8, r9
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ExpInterlockedPopEntrySListEnd:
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GLOBAL_LABEL ExpInterlockedPopEntrySListEnd
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/* If [rcx] equals rax, exchange it with r8 */
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lock cmpxchg [rcx], r8
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@ -160,29 +160,34 @@ ExpInterlockedPopEntrySListEnd:
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ret
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RtlInterlockedPopEntrySListEmpty:
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xor rax, rax
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ret
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RtlInterlockedPopEntrySList16:
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ENDFUNC
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FUNC RtlInterlockedPopEntrySList16
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mov [rsp + P3Home], rbx
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.SAVEREG rbx, P3Home
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.ENDPROLOG
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/* This is a 16 byte header
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rcx == ListHead
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rdx == ListHead->Region
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rax == ListHead->Alignment */
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/* Save rbx */
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push rbx
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/* Copy rcx to r8, as we need rcx for the exchange */
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mov r8, rcx
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ExpInterlockedPopEntrySListResume16:
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GLOBAL_LABEL ExpInterlockedPopEntrySListResume16
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/* Set r9 = ListHead->NextEntry and check if it is NULL */
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mov r9, rdx
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and r9, SLIST16B_NEXTENTRY_MASK
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jz RtlInterlockedPopEntrySListEmpty16
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ExpInterlockedPopEntrySListFault16:
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GLOBAL_LABEL ExpInterlockedPopEntrySListFault16
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/* Set NewListHead.Next = ListHead->NextEntry->Next */
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mov rcx, [r9]
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@ -193,7 +198,7 @@ ExpInterlockedPopEntrySListFault16:
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/* Copy Depth and Sequence number and adjust Depth */
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lea rbx, [rax - SLIST16A_DEPTH_INC]
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ExpInterlockedPopEntrySListEnd16:
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GLOBAL_LABEL ExpInterlockedPopEntrySListEnd16
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/* If [r8] equals rdx:rax, exchange it with rcx:rbx */
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lock cmpxchg16b [r8]
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@ -206,13 +211,15 @@ ExpInterlockedPopEntrySListEnd16:
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and rax, SLIST16B_NEXTENTRY_MASK
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/* Return */
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pop rbx
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mov rbx, [rsp + P3Home]
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ret
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RtlInterlockedPopEntrySListEmpty16:
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xor rax, rax
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pop rbx
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mov rbx, [rsp + P3Home]
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ret
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ENDFUNC
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/* PSLIST_ENTRY
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@ -221,8 +228,9 @@ RtlInterlockedPopEntrySListEmpty16:
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* IN PSLIST_HEADER ListHead,
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* IN PSLIST_ENTRY ListEntry);
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*/
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RtlInterlockedPushEntrySList:
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ExpInterlockedPushEntrySList:
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FUNC RtlInterlockedPushEntrySList
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.ENDPROLOG
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#if DBG
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/* Make sure the ListEntry is 16 bytes aligned */
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@ -298,16 +306,19 @@ RtlInterlockedPushEntrySListEmpty:
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mov rax, r9
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ret
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RtlInterlockedPushEntrySList16:
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ENDFUNC
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FUNC RtlInterlockedPushEntrySList16
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mov [rsp + P3Home], rbx
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.SAVEREG rbx, P3Home
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.ENDPROLOG
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/* This is a 16 byte header
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rcx = ListHead
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rdx = ListEntry
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rax = ListHead->Alignment
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r9 = ListHead->Region */
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/* Save rbx */
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push rbx
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/* Copy rcx/rdx to r8/r9, as we need rcx/rdx for the exchange */
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mov r8, rcx
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mov r9, rdx
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@ -349,17 +360,23 @@ RtlInterlockedPushEntrySListLoop16:
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and rax, SLIST16B_NEXTENTRY_MASK
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/* Return */
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pop rbx
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mov rbx, [rsp + P3Home]
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ret
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ENDFUNC
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/* PSLIST_ENTRY
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* NTAPI
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* RtlInterlockedFlushSList(
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* IN PSLIST_HEADER ListHead);
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*/
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RtlInterlockedFlushSList:
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ExpInterlockedFlushSList:
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FUNC RtlInterlockedFlushSList
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mov [rsp + P3Home], rbx
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.SAVEREG rbx, P3Home
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.ENDPROLOG
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/* Load ListHead->Region into rdx */
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mov rdx, [rcx + 8]
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@ -403,9 +420,6 @@ RtlInterlockedFlushSList16:
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rdx = ListHead->Region
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*/
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/* Save rbx */
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push rbx
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/* Load ListHead into r8, as we need rcx for the exchange */
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mov r8, rcx
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@ -426,8 +440,10 @@ RtlInterlockedFlushSListLoop16:
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and rax, SLIST16B_NEXTENTRY_MASK
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/* Return */
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pop rbx
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mov rbx, [rsp + P3Home]
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ret
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ENDFUNC
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END
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