xen/arm64: entry: Introduce a macro to generate guest vector and use it

Most of the guest vectors are using the same pattern. This makes fairly
tedious to alter the pattern and risk introducing mistakes when updating
each path.

A new macro is introduced to generate the guest vectors and now use it
in the one that use the open-code version.

Signed-off-by: Julien Grall <julien.grall@arm.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Release-acked-by: Juergen Gross <jgross@suse.com>

xen/arch/arm/arm64/entry.S

@@ -175,6 +175,30 @@
 
         .endm
 
+        /*
+         * Generate a guest vector.
+         *
+         * iflags: Correspond to the list of interrupts to unmask
+         * save_x0_x1: See the description on top of the macro 'entry'
+         */
+        .macro  guest_vector compat, iflags, trap, save_x0_x1=1
+        entry   hyp=0, compat=\compat, save_x0_x1=\save_x0_x1
+        /*
+         * The vSError will be checked while SKIP_SYNCHRONIZE_SERROR_ENTRY_EXIT
+         * is not set. If a vSError took place, the initial exception will be
+         * skipped. Exit ASAP
+         */
+        ALTERNATIVE("bl check_pending_vserror; cbnz x0, 1f",
+                    "nop; nop",
+                    SKIP_SYNCHRONIZE_SERROR_ENTRY_EXIT)
+        msr     daifclr, \iflags
+        mov     x0, sp
+        bl      do_trap_\trap
+1:
+        exit    hyp=0, compat=\compat
+        .endm
+
+
 /*
  * Bad Abort numbers
  *-----------------
@@ -347,36 +371,10 @@ guest_sync_slowpath:
          * x0/x1 may have been scratch by the fast path above, so avoid
          * to save them.
          */
-        entry   hyp=0, compat=0, save_x0_x1=0
-        /*
-         * The vSError will be checked while SKIP_SYNCHRONIZE_SERROR_ENTRY_EXIT
-         * is not set. If a vSError took place, the initial exception will be
-         * skipped. Exit ASAP
-         */
-        ALTERNATIVE("bl check_pending_vserror; cbnz x0, 1f",
-                    "nop; nop",
-                    SKIP_SYNCHRONIZE_SERROR_ENTRY_EXIT)
-        msr     daifclr, #IFLAGS__AI_
-        mov     x0, sp
-        bl      do_trap_guest_sync
-1:
-        exit    hyp=0, compat=0
+        guest_vector compat=0, iflags=IFLAGS__AI_, trap=guest_sync, save_x0_x1=0
 
 guest_irq:
-        entry   hyp=0, compat=0
-        /*
-         * The vSError will be checked while SKIP_SYNCHRONIZE_SERROR_ENTRY_EXIT
-         * is not set. If a vSError took place, the initial exception will be
-         * skipped. Exit ASAP
-         */
-        ALTERNATIVE("bl check_pending_vserror; cbnz x0, 1f",
-                    "nop; nop",
-                    SKIP_SYNCHRONIZE_SERROR_ENTRY_EXIT)
-        msr     daifclr, #IFLAGS__A__
-        mov     x0, sp
-        bl      do_trap_irq
-1:
-        exit    hyp=0, compat=0
+        guest_vector compat=0, iflags=IFLAGS__A__, trap=irq
 
 guest_fiq_invalid:
         entry   hyp=0, compat=0
@@ -390,36 +388,10 @@ guest_error:
         exit    hyp=0, compat=0
 
 guest_sync_compat:
-        entry   hyp=0, compat=1
-        /*
-         * The vSError will be checked while SKIP_SYNCHRONIZE_SERROR_ENTRY_EXIT
-         * is not set. If a vSError took place, the initial exception will be
-         * skipped. Exit ASAP
-         */
-        ALTERNATIVE("bl check_pending_vserror; cbnz x0, 1f",
-                    "nop; nop",
-                    SKIP_SYNCHRONIZE_SERROR_ENTRY_EXIT)
-        msr     daifclr, #IFLAGS__AI_
-        mov     x0, sp
-        bl      do_trap_guest_sync
-1:
-        exit    hyp=0, compat=1
+        guest_vector compat=1, iflags=IFLAGS__AI_, trap=guest_sync
 
 guest_irq_compat:
-        entry   hyp=0, compat=1
-        /*
-         * The vSError will be checked while SKIP_SYNCHRONIZE_SERROR_ENTRY_EXIT
-         * is not set. If a vSError took place, the initial exception will be
-         * skipped. Exit ASAP
-         */
-        ALTERNATIVE("bl check_pending_vserror; cbnz x0, 1f",
-                    "nop; nop",
-                    SKIP_SYNCHRONIZE_SERROR_ENTRY_EXIT)
-        msr     daifclr, #IFLAGS__A__
-        mov     x0, sp
-        bl      do_trap_irq
-1:
-        exit    hyp=0, compat=1
+        guest_vector compat=1, iflags=IFLAGS__A__, trap=irq
 
 guest_fiq_invalid_compat:
         entry   hyp=0, compat=1