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authorRussell King <rmk+kernel@arm.linux.org.uk>2011-06-26 16:01:26 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-07-02 10:56:11 +0100
commitda7404725781bc7c736e10cae5521e5604e222a5 (patch)
treee816cd79e1b09ddcbd41b7cd5b3c6c9c9bd5eb98 /arch/arm/mm/abort-lv4t.S
parent0d147db0c127c561f8f9ead9f3c1ec38f89f1040 (diff)
ARM: entry: data abort: tail-call the main data abort handler
Tail-call the main C data abort handler code from the per-CPU helper code. Update the comments in the code wrt the new calling and return register state. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/abort-lv4t.S')
-rw-r--r--arch/arm/mm/abort-lv4t.S43
1 files changed, 21 insertions, 22 deletions
diff --git a/arch/arm/mm/abort-lv4t.S b/arch/arm/mm/abort-lv4t.S
index d032b1f2067b..d432f31cdab5 100644
--- a/arch/arm/mm/abort-lv4t.S
+++ b/arch/arm/mm/abort-lv4t.S
@@ -3,7 +3,8 @@
/*
* Function: v4t_late_abort
*
- * Params : r4 = aborted context pc
+ * Params : r2 = pt_regs
+ * : r4 = aborted context pc
* : r5 = aborted context psr
*
* Returns : r0 = address of abort
@@ -47,20 +48,18 @@ ENTRY(v4t_late_abort)
/* 9 */ b .data_arm_ldmstm @ ldm*b rn, <rlist>
/* a */ b .data_unknown
/* b */ b .data_unknown
-/* c */ mov pc, lr @ ldc rd, [rn], #m @ Same as ldr rd, [rn], #m
-/* d */ mov pc, lr @ ldc rd, [rn, #m]
+/* c */ b do_DataAbort @ ldc rd, [rn], #m @ Same as ldr rd, [rn], #m
+/* d */ b do_DataAbort @ ldc rd, [rn, #m]
/* e */ b .data_unknown
/* f */
.data_unknown: @ Part of jumptable
mov r0, r4
mov r1, r8
- mov r2, sp
- bl baddataabort
- b ret_from_exception
+ b baddataabort
.data_arm_ldmstm:
tst r8, #1 << 21 @ check writeback bit
- moveq pc, lr @ no writeback -> no fixup
+ beq do_DataAbort @ no writeback -> no fixup
mov r7, #0x11
orr r7, r7, #0x1100
and r6, r8, r7
@@ -79,11 +78,11 @@ ENTRY(v4t_late_abort)
subne r7, r7, r6, lsl #2 @ Undo increment
addeq r7, r7, r6, lsl #2 @ Undo decrement
str r7, [sp, r5, lsr #14] @ Put register 'Rn'
- mov pc, lr
+ b do_DataAbort
.data_arm_lateldrhpre:
tst r8, #1 << 21 @ Check writeback bit
- moveq pc, lr @ No writeback -> no fixup
+ beq do_DataAbort @ No writeback -> no fixup
.data_arm_lateldrhpost:
and r5, r8, #0x00f @ get Rm / low nibble of immediate value
tst r8, #1 << 22 @ if (immediate offset)
@@ -97,25 +96,25 @@ ENTRY(v4t_late_abort)
subne r7, r7, r6 @ Undo incrmenet
addeq r7, r7, r6 @ Undo decrement
str r7, [sp, r5, lsr #14] @ Put register 'Rn'
- mov pc, lr
+ b do_DataAbort
.data_arm_lateldrpreconst:
tst r8, #1 << 21 @ check writeback bit
- moveq pc, lr @ no writeback -> no fixup
+ beq do_DataAbort @ no writeback -> no fixup
.data_arm_lateldrpostconst:
movs r9, r8, lsl #20 @ Get offset
- moveq pc, lr @ zero -> no fixup
+ beq do_DataAbort @ zero -> no fixup
and r5, r8, #15 << 16 @ Extract 'n' from instruction
ldr r7, [sp, r5, lsr #14] @ Get register 'Rn'
tst r8, #1 << 23 @ Check U bit
subne r7, r7, r9, lsr #20 @ Undo increment
addeq r7, r7, r9, lsr #20 @ Undo decrement
str r7, [sp, r5, lsr #14] @ Put register 'Rn'
- mov pc, lr
+ b do_DataAbort
.data_arm_lateldrprereg:
tst r8, #1 << 21 @ check writeback bit
- moveq pc, lr @ no writeback -> no fixup
+ beq do_DataAbort @ no writeback -> no fixup
.data_arm_lateldrpostreg:
and r7, r8, #15 @ Extract 'm' from instruction
ldr r6, [sp, r7, lsl #2] @ Get register 'Rm'
@@ -172,10 +171,10 @@ ENTRY(v4t_late_abort)
/* 3 */ b .data_unknown
/* 4 */ b .data_unknown
/* 5 */ b .data_thumb_reg
-/* 6 */ mov pc, lr
-/* 7 */ mov pc, lr
-/* 8 */ mov pc, lr
-/* 9 */ mov pc, lr
+/* 6 */ b do_DataAbort
+/* 7 */ b do_DataAbort
+/* 8 */ b do_DataAbort
+/* 9 */ b do_DataAbort
/* A */ b .data_unknown
/* B */ b .data_thumb_pushpop
/* C */ b .data_thumb_ldmstm
@@ -185,10 +184,10 @@ ENTRY(v4t_late_abort)
.data_thumb_reg:
tst r8, #1 << 9
- moveq pc, lr
+ beq do_DataAbort
tst r8, #1 << 10 @ If 'S' (signed) bit is set
movne r1, #0 @ it must be a load instr
- mov pc, lr
+ b do_DataAbort
.data_thumb_pushpop:
tst r8, #1 << 10
@@ -207,7 +206,7 @@ ENTRY(v4t_late_abort)
addeq r7, r7, r6, lsl #2 @ increment SP if PUSH
subne r7, r7, r6, lsl #2 @ decrement SP if POP
str r7, [sp, #13 << 2]
- mov pc, lr
+ b do_DataAbort
.data_thumb_ldmstm:
and r6, r8, #0x55 @ hweight8(r8)
@@ -222,4 +221,4 @@ ENTRY(v4t_late_abort)
and r6, r6, #15 @ number of regs to transfer
sub r7, r7, r6, lsl #2 @ always decrement
str r7, [sp, r5, lsr #6]
- mov pc, lr
+ b do_DataAbort