[PATCH v2 1/6] xen/arm: traps: Simplify the switch in do_trap_*_abort_guest

[Julien Grall <julien.grall@arm.com>]

The fault status we care are in the form BBBBxx where xx is the lookup
level that gave the fault. We can simplify the code by masking the 2 least
significant bits.

Signed-off-by: Julien Grall <julien.grall@arm.com>

---
    The switch has not been replaced by a simple if because more case
    will be added in follow-up patches.

    Changes in v2:
        - Fix typoes in the commit message
---
 xen/arch/arm/traps.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index 2d05936..b34c46f 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -2387,9 +2387,9 @@ static void do_trap_instr_abort_guest(struct cpu_user_regs *regs,
     int rc;
     register_t gva = READ_SYSREG(FAR_EL2);
 
-    switch ( hsr.iabt.ifsc & 0x3f )
+    switch ( hsr.iabt.ifsc & ~FSC_LL_MASK )
     {
-    case FSC_FLT_PERM ... FSC_FLT_PERM + 3:
+    case FSC_FLT_PERM:
     {
         paddr_t gpa;
         const struct npfec npfec = {
@@ -2450,9 +2450,9 @@ static void do_trap_data_abort_guest(struct cpu_user_regs *regs,
             return; /* Try again */
     }
 
-    switch ( dabt.dfsc & 0x3f )
+    switch ( dabt.dfsc & ~FSC_LL_MASK )
     {
-    case FSC_FLT_PERM ... FSC_FLT_PERM + 3:
+    case FSC_FLT_PERM:
     {
         const struct npfec npfec = {
             .read_access = !dabt.write,
-- 
1.9.1


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