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| author | Guo Ren <guoren@linux.alibaba.com> | 2019-12-17 04:12:55 +0100 |
|---|---|---|
| committer | Guo Ren <guoren@linux.alibaba.com> | 2020-02-21 08:43:24 +0100 |
| commit | f8e17c17b81070f38062dce79ca7f4541851dadd (patch) | |
| tree | 0de930c6cf557570a44beb5c167384ca0692d791 /arch/csky/abiv2 | |
| parent | csky/mm: Fixup export invalid_pte_table symbol (diff) | |
| download | linux-f8e17c17b81070f38062dce79ca7f4541851dadd.tar.xz linux-f8e17c17b81070f38062dce79ca7f4541851dadd.zip | |
csky: Set regs->usp to kernel sp, when the exception is from kernel
In the past, we didn't care about kernel sp when saving pt_reg. But in some
cases, we still need pt_reg->usp to represent the kernel stack before enter
exception.
For cmpxhg in atomic.S, we need save and restore usp for above.
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Diffstat (limited to 'arch/csky/abiv2')
| -rw-r--r-- | arch/csky/abiv2/inc/abi/entry.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/csky/abiv2/inc/abi/entry.h b/arch/csky/abiv2/inc/abi/entry.h index 9897a16b45e5..94a7a58765df 100644 --- a/arch/csky/abiv2/inc/abi/entry.h +++ b/arch/csky/abiv2/inc/abi/entry.h @@ -31,7 +31,13 @@ mfcr lr, epsr stw lr, (sp, 12) + btsti lr, 31 + bf 1f + addi lr, sp, 152 + br 2f +1: mfcr lr, usp +2: stw lr, (sp, 16) stw a0, (sp, 20) @@ -64,8 +70,10 @@ mtcr a0, epc ldw a0, (sp, 12) mtcr a0, epsr + btsti a0, 31 ldw a0, (sp, 16) mtcr a0, usp + mtcr a0, ss0 #ifdef CONFIG_CPU_HAS_HILO ldw a0, (sp, 140) @@ -86,6 +94,9 @@ addi sp, 40 ldm r16-r30, (sp) addi sp, 72 + bf 1f + mfcr sp, ss0 +1: rte .endm |