fixup! DONTMERGE Rework of PR 1857

Signed-off-by: Dmitrii Kuvaiskii <[email protected]>

pal/src/host/linux-sgx/host_entry.S

@@ -74,6 +74,12 @@ async_exit_pointer:
     # Inform that we are in AEX profiling code
     movb $1, %gs:PAL_HOST_TCB_IN_AEX_PROF
 
+    subq $RED_ZONE_SIZE, %rsp
+    .cfi_adjust_cfa_offset RED_ZONE_SIZE
+    # FIXME: This second RSP adjustment is because Exitless re-uses the same stack to create
+    #        RPC request objects, as the AEX flow here. It just so happens that the total size of
+    #        allocated RPC request objects is less than 128B (red zone size), so I reuse this const.
+    #        This double-stack-usage needs a proper fix.
     subq $RED_ZONE_SIZE, %rsp
     .cfi_adjust_cfa_offset RED_ZONE_SIZE
 
@@ -114,6 +120,9 @@ async_exit_pointer:
     .cfi_adjust_cfa_offset -8
     addq $RED_ZONE_SIZE, %rsp
     .cfi_adjust_cfa_offset -RED_ZONE_SIZE
+    # FIXME: See above for explanation for this second RSP adjustment.
+    addq $RED_ZONE_SIZE, %rsp
+    .cfi_adjust_cfa_offset -RED_ZONE_SIZE
 
     movb $0, %gs:PAL_HOST_TCB_IN_AEX_PROF
     .cfi_endproc