#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
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)
lds k2, pr ! restore pr
!
-#ifdef CONFIG_SH_DSP
- mov.l @r15+, k0 ! DSP mode marker
- mov.l 5f, k1
- cmp/eq k0, k1 ! Do we have a DSP stack frame?
- bf skip_restore
-
- stc sr, k0 ! Enable CPU DSP mode
- or k1, k0 ! (within kernel it may be disabled)
- ldc k0, sr
- mov r2, k0 ! Backup r2
-
- ! Restore DSP registers from stack
- mov r15, r2
- movs.l @r2+, a1
- movs.l @r2+, a0g
- movs.l @r2+, a1g
- movs.l @r2+, m0
- movs.l @r2+, m1
- mov r2, r15
-
- lds.l @r15+, a0
- lds.l @r15+, x0
- lds.l @r15+, x1
- lds.l @r15+, y0
- lds.l @r15+, y1
- lds.l @r15+, dsr
- ldc.l @r15+, rs
- ldc.l @r15+, re
- ldc.l @r15+, mod
-
- mov k0, r2 ! Restore r2
-skip_restore:
-#endif
- !
! 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
add k0, k4
0:
! Setup stack and save DSP context (k0 contains original r15 on return)
- bsr prepare_stack_save_dsp
+ bsr prepare_stack
nop
! Save registers / Switch to bank 0
1: .long EXPEVT
#endif
-! prepare_stack_save_dsp()
+! prepare_stack()
! - roll back gRB
! - switch to kernel stack
-! - save DSP
! k0 returns original sp (after roll back)
! k1 trashed
! k2 trashed
-prepare_stack_save_dsp:
+prepare_stack:
#ifdef CONFIG_GUSA
! Check for roll back gRB (User and Kernel)
mov r15, k0
mov k1, r15 ! change to kernel stack
!
1:
-#ifdef CONFIG_SH_DSP
- ! Save DSP context if needed
- stc sr, k1
- mov #0x10, k2
- shll8 k2 ! DSP=1 (0x00001000)
- tst k2, k1 ! Check if in DSP mode (passed in k2)
- bt/s skip_save
- mov #0, k1 ! Set marker for no stack frame
-
- mov k2, k1 ! Save has-frame marker
-
- ! Save DSP registers on stack
- stc.l mod, @-r15
- stc.l re, @-r15
- stc.l rs, @-r15
- sts.l dsr, @-r15
- sts.l y1, @-r15
- sts.l y0, @-r15
- sts.l x1, @-r15
- sts.l x0, @-r15
- sts.l a0, @-r15
-
- ! GAS is broken, does not generate correct "movs.l Ds,@-As" instr.
-
- ! FIXME: Make sure that this is still the case with newer toolchains,
- ! as we're not at all interested in supporting ancient toolchains at
- ! this point. -- PFM.
-
- mov r15, k2
- .word 0xf653 ! movs.l a1, @-r2
- .word 0xf6f3 ! movs.l a0g, @-r2
- .word 0xf6d3 ! movs.l a1g, @-r2
- .word 0xf6c3 ! movs.l m0, @-r2
- .word 0xf6e3 ! movs.l m1, @-r2
- mov k2, r15
-
-skip_save:
- mov.l k1, @-r15 ! Push DSP mode marker onto stack
-#endif
rts
nop
+
!
! 0x400: Instruction and Data TLB miss exception vector
!
mova exception_data, k0
! Setup stack and save DSP context (k0 contains original r15 on return)
- bsr prepare_stack_save_dsp
+ bsr prepare_stack
PREF(k0)
! Save registers / Switch to bank 0
mova exception_data, k0
! Setup stack and save DSP context (k0 contains original r15 on return)
- bsr prepare_stack_save_dsp
+ bsr prepare_stack
PREF(k0)
! Save registers / Switch to bank 0
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)
projects / linux-block.git / blobdiff