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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-03-12 12:50:16 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-03-29 13:22:04 +1100 |
| commit | 0512aadd750acf72b8906973c34e7092642d4323 (patch) | |
| tree | ed3c797f791999cc279f35e5a25fb11dd5d980dd /arch/powerpc/kernel/head_40x.S | |
| parent | 0fc1e93481f67a49f67c9168b71842eeb0998b25 (diff) | |
| download | linux-0512aadd750acf72b8906973c34e7092642d4323.tar.bz2 | |
powerpc/40x: Prepare normal exception handler for enabling MMU early
Ensure normal exception handler are able to manage stuff with
MMU enabled. For that we use CONFIG_VMAP_STACK related code
allthough there is no intention to really activate CONFIG_VMAP_STACK
on powerpc 40x for the moment.
40x uses SPRN_DEAR instead of SPRN_DAR and SPRN_ESR instead of
SPRN_DSISR. Take it into account in common macros.
40x MSR value doesn't fit on 15 bits, use LOAD_REG_IMMEDIATE() in
common macros that will be used also with 40x.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/01963af2b83037bca270d7bf1336ffcf35da8282.1615552866.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/kernel/head_40x.S')
| -rw-r--r-- | arch/powerpc/kernel/head_40x.S | 17 |
1 files changed, 6 insertions, 11 deletions
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S index 1468f38c3860..4bf0aee858eb 100644 --- a/arch/powerpc/kernel/head_40x.S +++ b/arch/powerpc/kernel/head_40x.S @@ -221,11 +221,8 @@ _ENTRY(saved_ksp_limit) * if they can't resolve the lightweight TLB fault. */ START_EXCEPTION(0x0300, DataStorage) - EXCEPTION_PROLOG - mfspr r5, SPRN_ESR /* Grab the ESR, save it */ - stw r5, _ESR(r11) - mfspr r4, SPRN_DEAR /* Grab the DEAR, save it */ - stw r4, _DEAR(r11) + EXCEPTION_PROLOG handle_dar_dsisr=1 + save_dar_dsisr_on_stack r4, r5, r11 EXC_XFER_LITE(0x300, handle_page_fault) /* @@ -244,17 +241,15 @@ _ENTRY(saved_ksp_limit) /* 0x0600 - Alignment Exception */ START_EXCEPTION(0x0600, Alignment) - EXCEPTION_PROLOG - mfspr r4,SPRN_DEAR /* Grab the DEAR and save it */ - stw r4,_DEAR(r11) + EXCEPTION_PROLOG handle_dar_dsisr=1 + save_dar_dsisr_on_stack r4, r5, r11 addi r3,r1,STACK_FRAME_OVERHEAD EXC_XFER_STD(0x600, alignment_exception) /* 0x0700 - Program Exception */ START_EXCEPTION(0x0700, ProgramCheck) - EXCEPTION_PROLOG - mfspr r4,SPRN_ESR /* Grab the ESR and save it */ - stw r4,_ESR(r11) + EXCEPTION_PROLOG handle_dar_dsisr=1 + save_dar_dsisr_on_stack r4, r5, r11 addi r3,r1,STACK_FRAME_OVERHEAD EXC_XFER_STD(0x700, program_check_exception) |