ARC: [mm] Remove @write argument to do_page_fault()
This can be ascertained within do_page_fault() since it gets the full
ECR (Exception Cause Register).
Further, for both the callers of do_page_fault(): Prot-V / D-TLB-Miss,
the cause sub-fields in ECR are same for same type of access, making the
code much more simpler.
D-TLB-Miss [LD] 0x00_21_01_00
Prot-V [LD] 0x00_23_01_00
^^
D-TLB-Miss [ST] 0x00_21_02_00
Prot-V [ST] 0x00_23_02_00
^^
D-TLB-Miss [EX] 0x00_21_03_00
Prot-V [EX] 0x00_23_03_00
^^
This helps code consolidation, which is even better when moving code from
assembler to "C".
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
diff --git a/arch/arc/mm/tlbex.S b/arch/arc/mm/tlbex.S
index 7bf811d..bd8bc90 100644
--- a/arch/arc/mm/tlbex.S
+++ b/arch/arc/mm/tlbex.S
@@ -381,18 +381,8 @@
; ------- setup args for Linux Page fault Hanlder ---------
mov_s r0, sp
- lr r2, [efa]
- lr r3, [ecr]
-
- ; Both st and ex imply WRITE access of some sort, hence do_page_fault( )
- ; invoked with write=1 for DTLB-st/ex Miss and write=0 for ITLB miss or
- ; DTLB-ld Miss
- ; DTLB Miss Cause code is ld = 0x01 , st = 0x02, ex = 0x03
- ; Following code uses that fact that st/ex have one bit in common
-
- btst_s r3, ECR_C_BIT_DTLB_ST_MISS
- mov.z r1, 0
- mov.nz r1, 1
+ lr r1, [efa]
+ lr r2, [ecr]
; We don't want exceptions to be disabled while the fault is handled.
; Now that we have saved the context we return from exception hence