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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-03-12 15:50:22 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-03-29 05:22:05 +0300 |
| commit | 7aa8dd67f15731f659390018b5c9fd95f5975b3d (patch) | |
| tree | dae28ba3fe83b21967409a57738f19d28e7a1b1d /arch/powerpc/kernel/head_8xx.S | |
| parent | 5747230645562921b5bc19f6409f7af08fe17c6d (diff) | |
| download | linux-7aa8dd67f15731f659390018b5c9fd95f5975b3d.tar.xz | |
powerpc/32: Always enable data translation in exception prolog
If the code can use a stack in vm area, it can also use a
stack in linear space.
Simplify code by removing old non VMAP stack code on PPC32.
That means the data translation is now re-enabled early in
exception prolog in all cases, not only when using VMAP stacks.
While we are touching EXCEPTION_PROLOG macros, remove the
unused for_rtas parameter in EXCEPTION_PROLOG_1.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/7cd6440c60a7e8f4f035b245c57720f51e225aae.1615552866.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/kernel/head_8xx.S')
| -rw-r--r-- | arch/powerpc/kernel/head_8xx.S | 19 |
1 files changed, 2 insertions, 17 deletions
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S index 46dff3f9c31f..792e2fd86479 100644 --- a/arch/powerpc/kernel/head_8xx.S +++ b/arch/powerpc/kernel/head_8xx.S @@ -124,7 +124,6 @@ instruction_counter: . = 0x200 MachineCheck: EXCEPTION_PROLOG handle_dar_dsisr=1 - 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 @@ -137,7 +136,6 @@ MachineCheck: . = 0x600 Alignment: EXCEPTION_PROLOG handle_dar_dsisr=1 - 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 @@ -333,21 +331,16 @@ DataTLBError: cmpwi cr1, r11, RPN_PATTERN beq- cr1, FixupDAR /* must be a buggy dcbX, icbi insn. */ DARFixed:/* Return from dcbx instruction bug workaround */ -#ifdef CONFIG_VMAP_STACK li r11, RPN_PATTERN mtspr SPRN_DAR, r11 /* Tag DAR, to be used in DTLB Error */ -#endif EXCEPTION_PROLOG_1 EXCEPTION_PROLOG_2 handle_dar_dsisr=1 - get_and_save_dar_dsisr_on_stack r4, r5, r11 + lwz r4, _DAR(r11) + lwz r5, _DSISR(r11) andis. r10,r5,DSISR_NOHPTE@h beq+ .Ldtlbie tlbie r4 .Ldtlbie: -#ifndef CONFIG_VMAP_STACK - li r10,RPN_PATTERN - mtspr SPRN_DAR,r10 /* Tag DAR, to be used in DTLB Error */ -#endif /* 0x300 is DataAccess exception, needed by bad_page_fault() */ EXC_XFER_LITE(0x300, handle_page_fault) @@ -364,10 +357,6 @@ do_databreakpoint: addi r3,r1,STACK_FRAME_OVERHEAD mfspr r4,SPRN_BAR stw r4,_DAR(r11) -#ifndef CONFIG_VMAP_STACK - mfspr r5,SPRN_DSISR - stw r5,_DSISR(r11) -#endif EXC_XFER_STD(0x1c00, do_break) . = 0x1c00 @@ -510,14 +499,10 @@ FixupDAR:/* Entry point for dcbx workaround. */ 152: mfdar r11 mtctr r11 /* restore ctr reg from DAR */ -#ifdef CONFIG_VMAP_STACK mfspr r11, SPRN_SPRG_THREAD stw r10, DAR(r11) mfspr r10, SPRN_DSISR stw r10, DSISR(r11) -#else - mtdar r10 /* save fault EA to DAR */ -#endif mfspr r10,SPRN_M_TW b DARFixed /* Go back to normal TLB handling */ |