diff options
| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2019-12-21 08:32:26 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-01-26 22:15:09 +1100 |
| commit | c9c84fd945bbaadbf69d953be308e6f35737fef6 (patch) | |
| tree | 8d5cdafe098c7ac3743fcc0673b376aeca765700 /arch/powerpc/kernel | |
| parent | 5ae8fabc644632d31babbc7162aa876c79aaadb3 (diff) | |
powerpc/32: add a macro to get and/or save DAR and DSISR on stack.
Refactor reading and saving of DAR and DSISR in exception vectors.
This will ease the implementation of VMAP stack.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/1286b3e51b07727c6b4b05f2df9af3f9b1717fb5.1576916812.git.christophe.leroy@c-s.fr
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/head_32.S | 5 | ||||
| -rw-r--r-- | arch/powerpc/kernel/head_32.h | 11 | ||||
| -rw-r--r-- | arch/powerpc/kernel/head_8xx.S | 23 |
3 files changed, 19 insertions, 20 deletions
diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S index bebb49d877f2..449625b4ff03 100644 --- a/arch/powerpc/kernel/head_32.S +++ b/arch/powerpc/kernel/head_32.S @@ -339,10 +339,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE) DO_KVM 0x600 Alignment: EXCEPTION_PROLOG - mfspr r4,SPRN_DAR - stw r4,_DAR(r11) - mfspr r5,SPRN_DSISR - stw r5,_DSISR(r11) + save_dar_dsisr_on_stack r4, r5, r11 addi r3,r1,STACK_FRAME_OVERHEAD EXC_XFER_STD(0x600, alignment_exception) diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h index 436ffd862d2a..f19a1ab91fb5 100644 --- a/arch/powerpc/kernel/head_32.h +++ b/arch/powerpc/kernel/head_32.h @@ -144,6 +144,17 @@ RFI /* jump to handler, enable MMU */ .endm +.macro save_dar_dsisr_on_stack reg1, reg2, sp + mfspr \reg1, SPRN_DAR + mfspr \reg2, SPRN_DSISR + stw \reg1, _DAR(\sp) + stw \reg2, _DSISR(\sp) +.endm + +.macro get_and_save_dar_dsisr_on_stack reg1, reg2, sp + save_dar_dsisr_on_stack \reg1, \reg2, \sp +.endm + /* * Note: code which follows this uses cr0.eq (set if from kernel), * r11, r12 (SRR0), and r9 (SRR1). diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S index 175c3cfc8014..25e19af49705 100644 --- a/arch/powerpc/kernel/head_8xx.S +++ b/arch/powerpc/kernel/head_8xx.S @@ -128,12 +128,9 @@ instruction_counter: . = 0x200 MachineCheck: EXCEPTION_PROLOG - mfspr r4,SPRN_DAR - stw r4,_DAR(r11) - li r5,RPN_PATTERN - mtspr SPRN_DAR,r5 /* Tag DAR, to be used in DTLB Error */ - mfspr r5,SPRN_DSISR - stw r5,_DSISR(r11) + save_dar_dsisr_on_stack r4, r5, r11 + li r6, RPN_PATTERN + mtspr SPRN_DAR, r6 /* Tag DAR, to be used in DTLB Error */ addi r3,r1,STACK_FRAME_OVERHEAD EXC_XFER_STD(0x200, machine_check_exception) @@ -156,12 +153,9 @@ InstructionAccess: . = 0x600 Alignment: EXCEPTION_PROLOG - mfspr r4,SPRN_DAR - stw r4,_DAR(r11) - li r5,RPN_PATTERN - mtspr SPRN_DAR,r5 /* Tag DAR, to be used in DTLB Error */ - mfspr r5,SPRN_DSISR - stw r5,_DSISR(r11) + save_dar_dsisr_on_stack r4, r5, r11 + li r6, RPN_PATTERN + mtspr SPRN_DAR, r6 /* Tag DAR, to be used in DTLB Error */ addi r3,r1,STACK_FRAME_OVERHEAD EXC_XFER_STD(0x600, alignment_exception) @@ -502,10 +496,7 @@ DataTLBError: DARFixed:/* Return from dcbx instruction bug workaround */ EXCEPTION_PROLOG_1 EXCEPTION_PROLOG_2 - mfspr r5,SPRN_DSISR - stw r5,_DSISR(r11) - mfspr r4,SPRN_DAR - stw r4, _DAR(r11) + get_and_save_dar_dsisr_on_stack r4, r5, r11 andis. r10,r5,DSISR_NOHPTE@h beq+ .Ldtlbie tlbie r4 |