diff options
| author | Paul Mundt <lethal@linux-sh.org> | 2009-08-15 02:49:40 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2009-08-15 02:49:40 +0900 |
| commit | 112e58471de3431fbd03dee514777ad4a66a77b2 (patch) | |
| tree | d1cb3238e18467479d876ebcc99e06c1885e2538 /arch/sh | |
| parent | e7b8b7f16edc9b363573eadf2ab2683473626071 (diff) | |
sh: TLB protection violation exception optimizations.
This adds a bit of rework to have the TLB protection violations skip the
TLB miss fastpath and go directly in to do_page_fault(), as these require
slow path handling.
Based on an earlier patch by SUGIOKA Toshinobu.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh')
| -rw-r--r-- | arch/sh/kernel/cpu/sh3/entry.S | 30 | ||||
| -rw-r--r-- | arch/sh/mm/fault_32.c | 6 |
2 files changed, 22 insertions, 14 deletions
diff --git a/arch/sh/kernel/cpu/sh3/entry.S b/arch/sh/kernel/cpu/sh3/entry.S index 3cb531f233f..bbaf2bd118e 100644 --- a/arch/sh/kernel/cpu/sh3/entry.S +++ b/arch/sh/kernel/cpu/sh3/entry.S @@ -113,34 +113,33 @@ 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 + bra call_handle_tlbmiss mov #1, 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: 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 +150,25 @@ 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) diff --git a/arch/sh/mm/fault_32.c b/arch/sh/mm/fault_32.c index dbbdeba2cee..41840647f65 100644 --- a/arch/sh/mm/fault_32.c +++ b/arch/sh/mm/fault_32.c @@ -318,9 +318,9 @@ do_sigbus: /* * Called with interrupts disabled. */ -asmlinkage int __kprobes __do_page_fault(struct pt_regs *regs, - unsigned long writeaccess, - unsigned long address) +asmlinkage int __kprobes +handle_tlbmiss(struct pt_regs *regs, unsigned long writeaccess, + unsigned long address) { pgd_t *pgd; pud_t *pud; |