From: Santosh Sivaraj <santosh@fossix.org>
To: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
Mahesh Salgaonkar <mahesh@linux.ibm.com>,
Nicholas Piggin <npiggin@gmail.com>,
Chandan Rajendra <chandan@linux.vnet.ibm.com>,
Reza Arbab <arbab@linux.ibm.com>
Subject: [v2 10/12] powerpc/memcpy_mcsafe: return remaining bytes
Date: Tue, 2 Jul 2019 10:49:30 +0530 [thread overview]
Message-ID: <20190702051932.511-11-santosh@fossix.org> (raw)
In-Reply-To: <20190702051932.511-1-santosh@fossix.org>
memcpy_mcsafe currently return -EFAULT on a machine check exception, change
it to return the remaining bytes that needs to be copied, so that machine
check safe copy_to_user can maintain the same behavior as copy_to_user.
Signed-off-by: Santosh Sivaraj <santosh@fossix.org>
---
arch/powerpc/lib/memcpy_mcsafe_64.S | 129 +++++++++++++++-------------
1 file changed, 70 insertions(+), 59 deletions(-)
diff --git a/arch/powerpc/lib/memcpy_mcsafe_64.S b/arch/powerpc/lib/memcpy_mcsafe_64.S
index 50f865db0338..566c664aa640 100644
--- a/arch/powerpc/lib/memcpy_mcsafe_64.S
+++ b/arch/powerpc/lib/memcpy_mcsafe_64.S
@@ -30,11 +30,12 @@
ld r14,STK_REG(R14)(r1)
addi r1,r1,STACKFRAMESIZE
.Ldo_err1:
- li r3,-EFAULT
+ mr r3,r7
blr
_GLOBAL(memcpy_mcsafe)
+ mr r7,r5
cmpldi r5,16
blt .Lshort_copy
@@ -49,18 +50,21 @@ err1; lbz r0,0(r4)
addi r4,r4,1
err1; stb r0,0(r3)
addi r3,r3,1
+ subi r7,r7,1
1: bf cr7*4+2,2f
err1; lhz r0,0(r4)
addi r4,r4,2
err1; sth r0,0(r3)
addi r3,r3,2
+ subi r7,r7,2
2: bf cr7*4+1,3f
err1; lwz r0,0(r4)
addi r4,r4,4
err1; stw r0,0(r3)
addi r3,r3,4
+ subi r7,r7,4
3: sub r5,r5,r6
cmpldi r5,128
@@ -87,43 +91,69 @@ err1; stw r0,0(r3)
4:
err2; ld r0,0(r4)
err2; ld r6,8(r4)
-err2; ld r7,16(r4)
-err2; ld r8,24(r4)
-err2; ld r9,32(r4)
-err2; ld r10,40(r4)
-err2; ld r11,48(r4)
-err2; ld r12,56(r4)
-err2; ld r14,64(r4)
-err2; ld r15,72(r4)
-err2; ld r16,80(r4)
-err2; ld r17,88(r4)
-err2; ld r18,96(r4)
-err2; ld r19,104(r4)
-err2; ld r20,112(r4)
-err2; ld r21,120(r4)
+err2; ld r8,16(r4)
+err2; ld r9,24(r4)
+err2; ld r10,32(r4)
+err2; ld r11,40(r4)
+err2; ld r12,48(r4)
+err2; ld r14,56(r4)
+err2; ld r15,64(r4)
+err2; ld r16,72(r4)
+err2; ld r17,80(r4)
+err2; ld r18,88(r4)
+err2; ld r19,96(r4)
+err2; ld r20,104(r4)
+err2; ld r21,112(r4)
+err2; ld r22,120(r4)
addi r4,r4,128
err2; std r0,0(r3)
err2; std r6,8(r3)
-err2; std r7,16(r3)
-err2; std r8,24(r3)
-err2; std r9,32(r3)
-err2; std r10,40(r3)
-err2; std r11,48(r3)
-err2; std r12,56(r3)
-err2; std r14,64(r3)
-err2; std r15,72(r3)
-err2; std r16,80(r3)
-err2; std r17,88(r3)
-err2; std r18,96(r3)
-err2; std r19,104(r3)
-err2; std r20,112(r3)
-err2; std r21,120(r3)
+err2; std r8,16(r3)
+err2; std r9,24(r3)
+err2; std r10,32(r3)
+err2; std r11,40(r3)
+err2; std r12,48(r3)
+err2; std r14,56(r3)
+err2; std r15,64(r3)
+err2; std r16,72(r3)
+err2; std r17,80(r3)
+err2; std r18,88(r3)
+err2; std r19,96(r3)
+err2; std r20,104(r3)
+err2; std r21,112(r3)
+err2; std r22,120(r3)
addi r3,r3,128
+ subi r7,r7,128
bdnz 4b
clrldi r5,r5,(64-7)
- ld r14,STK_REG(R14)(r1)
+ /* Up to 127B to go */
+5: srdi r6,r5,4
+ mtocrf 0x01,r6
+
+6: bf cr7*4+1,7f
+err2; ld r0,0(r4)
+err2; ld r6,8(r4)
+err2; ld r8,16(r4)
+err2; ld r9,24(r4)
+err2; ld r10,32(r4)
+err2; ld r11,40(r4)
+err2; ld r12,48(r4)
+err2; ld r14,56(r4)
+ addi r4,r4,64
+err2; std r0,0(r3)
+err2; std r6,8(r3)
+err2; std r8,16(r3)
+err2; std r9,24(r3)
+err2; std r10,32(r3)
+err2; std r11,40(r3)
+err2; std r12,48(r3)
+err2; std r14,56(r3)
+ addi r3,r3,64
+ subi r7,r7,64
+
+7: ld r14,STK_REG(R14)(r1)
ld r15,STK_REG(R15)(r1)
ld r16,STK_REG(R16)(r1)
ld r17,STK_REG(R17)(r1)
@@ -134,42 +164,19 @@ err2; std r21,120(r3)
ld r22,STK_REG(R22)(r1)
addi r1,r1,STACKFRAMESIZE
- /* Up to 127B to go */
-5: srdi r6,r5,4
- mtocrf 0x01,r6
-
-6: bf cr7*4+1,7f
-err1; ld r0,0(r4)
-err1; ld r6,8(r4)
-err1; ld r7,16(r4)
-err1; ld r8,24(r4)
-err1; ld r9,32(r4)
-err1; ld r10,40(r4)
-err1; ld r11,48(r4)
-err1; ld r12,56(r4)
- addi r4,r4,64
-err1; std r0,0(r3)
-err1; std r6,8(r3)
-err1; std r7,16(r3)
-err1; std r8,24(r3)
-err1; std r9,32(r3)
-err1; std r10,40(r3)
-err1; std r11,48(r3)
-err1; std r12,56(r3)
- addi r3,r3,64
-
/* Up to 63B to go */
-7: bf cr7*4+2,8f
+ bf cr7*4+2,8f
err1; ld r0,0(r4)
err1; ld r6,8(r4)
-err1; ld r7,16(r4)
-err1; ld r8,24(r4)
+err1; ld r8,16(r4)
+err1; ld r9,24(r4)
addi r4,r4,32
err1; std r0,0(r3)
err1; std r6,8(r3)
-err1; std r7,16(r3)
-err1; std r8,24(r3)
+err1; std r8,16(r3)
+err1; std r9,24(r3)
addi r3,r3,32
+ subi r7,r7,32
/* Up to 31B to go */
8: bf cr7*4+3,9f
@@ -179,6 +186,7 @@ err1; ld r6,8(r4)
err1; std r0,0(r3)
err1; std r6,8(r3)
addi r3,r3,16
+ subi r7,r7,16
9: clrldi r5,r5,(64-4)
@@ -192,18 +200,21 @@ err1; lwz r6,4(r4)
err1; stw r0,0(r3)
err1; stw r6,4(r3)
addi r3,r3,8
+ subi r7,r7,8
12: bf cr7*4+1,13f
err1; lwz r0,0(r4)
addi r4,r4,4
err1; stw r0,0(r3)
addi r3,r3,4
+ subi r7,r7,4
13: bf cr7*4+2,14f
err1; lhz r0,0(r4)
addi r4,r4,2
err1; sth r0,0(r3)
addi r3,r3,2
+ subi r7,r7,2
14: bf cr7*4+3,15f
err1; lbz r0,0(r4)
--
2.20.1
next prev parent reply other threads:[~2019-07-02 5:33 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-02 5:19 [v2 00/12] powerpc: implement machine check safe memcpy Santosh Sivaraj
2019-07-02 5:19 ` [v2 01/12] powerpc/mce: Make machine_check_ue_event() static Santosh Sivaraj
2019-07-02 5:19 ` [v2 02/12] powerpc/mce: Bug fixes for MCE handling in kernel space Santosh Sivaraj
2019-07-02 5:19 ` [v2 03/12] powerpc/mce: Add MCE notification chain Santosh Sivaraj
2019-07-02 14:55 ` Reza Arbab
2019-07-02 5:19 ` [v2 04/12] powerpc/mce: Move machine_check_ue_event() call Santosh Sivaraj
2019-07-02 5:19 ` [v2 05/12] powerpc/mce: Allow notifier callback to handle MCE Santosh Sivaraj
2019-07-02 5:19 ` [v2 06/12] powerpc/mce: Add fixup address to UE events Santosh Sivaraj
2019-07-02 5:19 ` [v2 07/12] powerpc/memcpy: Add memcpy_mcsafe for pmem Santosh Sivaraj
2019-07-02 5:19 ` [v2 08/12] powerpc/mce: Handle memcpy_mcsafe() Santosh Sivaraj
2019-07-02 5:19 ` [v2 09/12] powerpc/mce: Enable MCE notifiers in external modules Santosh Sivaraj
2019-07-02 6:17 ` Nicholas Piggin
2019-07-02 9:33 ` Mahesh Jagannath Salgaonkar
2019-07-03 17:20 ` Reza Arbab
2019-07-04 2:36 ` Nicholas Piggin
2019-07-05 2:50 ` Reza Arbab
2019-07-05 5:29 ` Nicholas Piggin
2019-07-08 15:23 ` Reza Arbab
2019-07-02 5:19 ` Santosh Sivaraj [this message]
2019-07-02 5:19 ` [v2 11/12] powerpc: add machine check safe copy_to_user Santosh Sivaraj
2019-07-02 5:19 ` [v2 12/12] powerpc/64s: Save r13 in machine_check_common_early Santosh Sivaraj
2019-07-02 6:19 ` Nicholas Piggin
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