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-rw-r--r--arch/sh/kernel/cpu/sh3/entry.S102
1 files changed, 58 insertions, 44 deletions
diff --git a/arch/sh/kernel/cpu/sh3/entry.S b/arch/sh/kernel/cpu/sh3/entry.S
index 3cb531f233f2..0151933e5253 100644
--- a/arch/sh/kernel/cpu/sh3/entry.S
+++ b/arch/sh/kernel/cpu/sh3/entry.S
@@ -53,10 +53,6 @@
* syscall #
*
*/
-#if defined(CONFIG_KGDB)
-NMI_VEC = 0x1c0 ! Must catch early for debounce
-#endif
-
/* Offsets to the stack */
OFF_R0 = 0 /* Return value. New ABI also arg4 */
OFF_R1 = 4 /* New ABI: arg5 */
@@ -71,7 +67,6 @@ OFF_PC = (16*4)
OFF_SR = (16*4+8)
OFF_TRA = (16*4+6*4)
-
#define k0 r0
#define k1 r1
#define k2 r2
@@ -113,34 +108,34 @@ OFF_TRA = (16*4+6*4)
#if defined(CONFIG_MMU)
.align 2
ENTRY(tlb_miss_load)
- bra call_dpf
+ bra call_handle_tlbmiss
mov #0, r5
.align 2
ENTRY(tlb_miss_store)
- bra call_dpf
+ bra call_handle_tlbmiss
mov #1, r5
.align 2
ENTRY(initial_page_write)
- bra call_dpf
- mov #1, r5
+ bra call_handle_tlbmiss
+ mov #2, r5
.align 2
ENTRY(tlb_protection_violation_load)
- bra call_dpf
+ bra call_do_page_fault
mov #0, r5
.align 2
ENTRY(tlb_protection_violation_store)
- bra call_dpf
+ bra call_do_page_fault
mov #1, r5
-call_dpf:
+call_handle_tlbmiss:
+ setup_frame_reg
mov.l 1f, r0
mov r5, r8
mov.l @r0, r6
- mov r6, r9
mov.l 2f, r0
sts pr, r10
jsr @r0
@@ -151,16 +146,25 @@ call_dpf:
lds r10, pr
rts
nop
-0: mov.l 3f, r0
- mov r9, r6
+0:
mov r8, r5
+call_do_page_fault:
+ mov.l 1f, r0
+ mov.l @r0, r6
+
+ sti
+
+ mov.l 3f, r0
+ mov.l 4f, r1
+ mov r15, r4
jmp @r0
- mov r15, r4
+ lds r1, pr
.align 2
1: .long MMU_TEA
-2: .long __do_page_fault
+2: .long handle_tlbmiss
3: .long do_page_fault
+4: .long ret_from_exception
.align 2
ENTRY(address_error_load)
@@ -256,7 +260,7 @@ restore_all:
!
! Calculate new SR value
mov k3, k2 ! original SR value
- mov #0xf0, k1
+ mov #0xfffffff0, k1
extu.b k1, k1
not k1, k1
and k1, k2 ! Mask original SR value
@@ -272,21 +276,12 @@ restore_all:
6: or k0, k2 ! Set the IMASK-bits
ldc k2, ssr
!
-#if defined(CONFIG_KGDB)
- ! Clear in_nmi
- mov.l 6f, k0
- mov #0, k1
- mov.b k1, @k0
-#endif
mov k4, r15
rte
nop
.align 2
5: .long 0x00001000 ! DSP
-#ifdef CONFIG_KGDB
-6: .long in_nmi
-#endif
7: .long 0x30000000
! common exception handler
@@ -478,23 +473,6 @@ ENTRY(save_low_regs)
!
.balign 512,0,512
ENTRY(handle_interrupt)
-#if defined(CONFIG_KGDB)
- mov.l 2f, k2
- ! Debounce (filter nested NMI)
- mov.l @k2, k0
- mov.l 9f, k1
- cmp/eq k1, k0
- bf 11f
- mov.l 10f, k1
- tas.b @k1
- bt 11f
- rte
- nop
- .align 2
-9: .long NMI_VEC
-10: .long in_nmi
-11:
-#endif /* defined(CONFIG_KGDB) */
sts pr, k3 ! save original pr value in k3
mova exception_data, k0
@@ -507,13 +485,49 @@ ENTRY(handle_interrupt)
bsr save_regs ! needs original pr value in k3
mov #-1, k2 ! default vector kept in k2
+ setup_frame_reg
+
+ stc sr, r0 ! get status register
+ shlr2 r0
+ and #0x3c, r0
+ cmp/eq #0x3c, r0
+ bf 9f
+ TRACE_IRQS_OFF
+9:
+
! Setup return address and jump to do_IRQ
mov.l 4f, r9 ! fetch return address
lds r9, pr ! put return address in pr
mov.l 2f, r4
mov.l 3f, r9
mov.l @r4, r4 ! pass INTEVT vector as arg0
+
+ shlr2 r4
+ shlr r4
+ mov r4, r0 ! save vector->jmp table offset for later
+
+ shlr2 r4 ! vector to IRQ# conversion
+ add #-0x10, r4
+
+ cmp/pz r4 ! is it a valid IRQ?
+ bt 10f
+
+ /*
+ * We got here as a result of taking the INTEVT path for something
+ * that isn't a valid hard IRQ, therefore we bypass the do_IRQ()
+ * path and special case the event dispatch instead. This is the
+ * expected path for the NMI (and any other brilliantly implemented
+ * exception), which effectively wants regular exception dispatch
+ * but is unfortunately reported through INTEVT rather than
+ * EXPEVT. Grr.
+ */
+ mov.l 6f, r9
+ mov.l @(r0, r9), r9
jmp @r9
+ mov r15, r8 ! trap handlers take saved regs in r8
+
+10:
+ jmp @r9 ! Off to do_IRQ() we go.
mov r15, r5 ! pass saved registers as arg1
ENTRY(exception_none)