From: Vineet Gupta <vgupta@synopsys.com>
Date: Wed, 18 Sep 2013 10:55:40 +0000 (+0530)
Subject: ARC: Change calling convention of do_page_fault()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=21a63b56044706aa37637315dd27d9d465bbd5c4;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

ARC: Change calling convention of do_page_fault()

switch the args (address, pt_regs) to match with all the other "C"
exception handlers.

This removes the awkwardness in EV_ProtV for page fault vs. unaligned
access.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
---

diff --git a/arch/arc/kernel/entry.S b/arch/arc/kernel/entry.S
index b908dde8a331..eb3f3c5a700a 100644
--- a/arch/arc/kernel/entry.S
+++ b/arch/arc/kernel/entry.S
@@ -337,9 +337,9 @@ ARC_ENTRY EV_TLBProtV
 	;  vineetg: Mar 6th: Random Seg Fault issue #1
 	;  ecr and efa were not saved in case an Intr sneaks in
 	;  after fake rtie
-	;
+
 	lr  r2, [ecr]
-	lr  r1, [efa]	; Faulting Data address
+	lr  r0, [efa]	; Faulting Data address
 
 	; --------(4) Return from CPU Exception Mode ---------
 	;  Fake a rtie, but rtie to next label
@@ -348,6 +348,8 @@ ARC_ENTRY EV_TLBProtV
 
 	FAKE_RET_FROM_EXCPN r9
 
+	mov   r1, sp
+
 	;------ (5) Type of Protection Violation? ----------
 	;
 	; ProtV Hardware Exception is triggered for Access Faults of 2 types
@@ -358,14 +360,11 @@ ARC_ENTRY EV_TLBProtV
 	bbit1 r2, ECR_C_BIT_PROTV_MISALIG_DATA, 4f
 
 	;========= (6a) Access Violation Processing ========
-	mov r0, sp              ; pt_regs
 	bl  do_page_fault
 	b   ret_from_exception
 
 	;========== (6b) Non aligned access ============
 4:
-	mov r0, r1
-	mov r1, sp              ; pt_regs
 
 #ifdef  CONFIG_ARC_MISALIGN_ACCESS
 	SAVE_CALLEE_SAVED_USER
diff --git a/arch/arc/mm/fault.c b/arch/arc/mm/fault.c
index 0c14d8a52683..9c69552350c4 100644
--- a/arch/arc/mm/fault.c
+++ b/arch/arc/mm/fault.c
@@ -52,7 +52,7 @@ bad_area:
 	return 1;
 }
 
-void do_page_fault(struct pt_regs *regs, unsigned long address)
+void do_page_fault(unsigned long address, struct pt_regs *regs)
 {
 	struct vm_area_struct *vma = NULL;
 	struct task_struct *tsk = current;
diff --git a/arch/arc/mm/tlbex.S b/arch/arc/mm/tlbex.S
index cf7d7d9ad695..3fcfdb38d242 100644
--- a/arch/arc/mm/tlbex.S
+++ b/arch/arc/mm/tlbex.S
@@ -369,8 +369,8 @@ do_slow_path_pf:
 	EXCEPTION_PROLOGUE
 
 	; ------- setup args for Linux Page fault Hanlder ---------
-	mov_s r0, sp
-	lr  r1, [efa]
+	mov_s r1, sp
+	lr    r0, [efa]
 
 	; 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