[Xen-changelog] [xen staging] xen/arm32: entry: Split __DEFINE_ENTRY_TRAP in two

[patchbot@xxxxxxx]

commit 6eeef7ecaeec002bb1da7e20c9cfaec5549bd940
Author:     Julien Grall <julien.grall@xxxxxxx>
AuthorDate: Tue Oct 1 13:07:53 2019 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Oct 31 16:20:58 2019 +0100

    xen/arm32: entry: Split __DEFINE_ENTRY_TRAP in two
    
    The preprocessing macro __DEFINE_ENTRY_TRAP is used to generate trap
    entry function. While the macro is fairly small today, follow-up patches
    will increase the size signicantly.
    
    In general, assembly macros are more readable as they allow you to name
    parameters and avoid '\'. So the actual implementation of the trap is
    now switched to an assembly macro.
    
    This is part of XSA-303.
    
    Reported-by: Julien Grall <Julien.Grall@xxxxxxx>
    Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
    Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
    Reviewed-by: Andre Przywara <andre.przywara@xxxxxxx>
---
 xen/arch/arm/arm32/entry.S | 34 +++++++++++++++++++---------------
 1 file changed, 19 insertions(+), 15 deletions(-)

diff --git a/xen/arch/arm/arm32/entry.S b/xen/arch/arm/arm32/entry.S
index 0b4cd19abd..4a762e04f1 100644
--- a/xen/arch/arm/arm32/entry.S
+++ b/xen/arch/arm/arm32/entry.S
@@ -126,24 +126,28 @@ abort_guest_exit_end:
 skip_check:
         mov pc, lr
 
-/*
- * Macro to define trap entry. The iflags corresponds to the list of
- * interrupts (Asynchronous Abort, IRQ, FIQ) to unmask.
- */
+        /*
+         * Macro to define trap entry. The iflags corresponds to the list of
+         * interrupts (Asynchronous Abort, IRQ, FIQ) to unmask.
+         */
+        .macro vector trap, iflags
+        SAVE_ALL
+        cpsie   \iflags
+        adr     lr, return_from_trap
+        mov     r0, sp
+        /*
+         * Save the stack pointer in r11. It will be restored after the
+         * trap has been handled (see return_from_trap).
+         */
+        mov     r11, sp
+        bic     sp, #7      /* Align the stack pointer (noop on guest trap) */
+        b       do_trap_\trap
+        .endm
+
 #define __DEFINE_TRAP_ENTRY(trap, iflags)                               \
         ALIGN;                                                          \
 trap_##trap:                                                            \
-        SAVE_ALL;                                                       \
-        cpsie iflags;                                                   \
-        adr lr, return_from_trap;                                       \
-        mov r0, sp;                                                     \
-        /*                                                              \
-         * Save the stack pointer in r11. It will be restored after the \
-         * trap has been handled (see return_from_trap).                \
-         */                                                             \
-        mov r11, sp;                                                    \
-        bic sp, #7; /* Align the stack pointer (noop on guest trap) */  \
-        b do_trap_##trap
+        vector trap, iflags
 
 /* Trap handler which unmask IRQ/Abort, keep FIQ masked */
 #define DEFINE_TRAP_ENTRY(trap) __DEFINE_TRAP_ENTRY(trap, ai)
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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