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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2017-07-19 06:49:25 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-08-03 08:06:26 +0200 |
| commit | d300627c6a53693fb01479b59b0cdd293761b1fa (patch) | |
| tree | a68e93971856f45d6474fb34eb763f894afa7f1b /arch/powerpc/kernel/entry_32.S | |
| parent | powerpc/mm: Pre-filter SRR1 bits before do_page_fault() (diff) | |
| download | linux-d300627c6a53693fb01479b59b0cdd293761b1fa.tar.xz linux-d300627c6a53693fb01479b59b0cdd293761b1fa.zip | |
powerpc/6xx: Handle DABR match before calling do_page_fault
On legacy 6xx 32-bit procesors, we checked for the DABR match bit
in DSISR from do_page_fault(), in the middle of a pile of ifdef's
because all other CPU types do it in assembly prior to calling
do_page_fault. Fix that.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
[mpe: Add #ifdef CONFIG_6xx]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/entry_32.S')
| -rw-r--r-- | arch/powerpc/kernel/entry_32.S | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S index 8587059ad848..dff51ea52e49 100644 --- a/arch/powerpc/kernel/entry_32.S +++ b/arch/powerpc/kernel/entry_32.S @@ -586,7 +586,11 @@ ppc_swapcontext: handle_page_fault: stw r4,_DAR(r1) addi r3,r1,STACK_FRAME_OVERHEAD + andis. r0,r5,DSISR_DABRMATCH@h +#ifdef CONFIG_6xx + bne- handle_dabr_fault bl do_page_fault +#endif cmpwi r3,0 beq+ ret_from_except SAVE_NVGPRS(r1) @@ -599,6 +603,17 @@ handle_page_fault: bl bad_page_fault b ret_from_except_full +#ifdef CONFIG_6xx + /* We have a data breakpoint exception - handle it */ +handle_dabr_fault: + SAVE_NVGPRS(r1) + lwz r0,_TRAP(r1) + clrrwi r0,r0,1 + stw r0,_TRAP(r1) + bl do_break + b ret_from_except_full +#endif + /* * This routine switches between two different tasks. The process * state of one is saved on its kernel stack. Then the state |