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| author |  Christophe Leroy <christophe.leroy@c-s.fr>
| 2019-12-21 08:32:27 +0000 |
|---|---|---|
| committer |  Michael Ellerman <mpe@ellerman.id.au>
| 2020-01-26 22:15:09 +1100 |
| commit | 028474876f472c3b6eee633aed528a1206609657 (patch) | |
| tree | ddf5742f1232e48a0665eb5b0a157caa28567a17 /arch/powerpc/include/asm/processor.h | |
| parent | powerpc/32: add a macro to get and/or save DAR and DSISR on stack. (diff) | |
| download | linux-028474876f472c3b6eee633aed528a1206609657.tar.gz linux-028474876f472c3b6eee633aed528a1206609657.tar.bz2 linux-028474876f472c3b6eee633aed528a1206609657.zip | |
powerpc/32: prepare for CONFIG_VMAP_STACK
To support CONFIG_VMAP_STACK, the kernel has to activate Data MMU
Translation for accessing the stack. Before doing that it must save
SRR0, SRR1 and also DAR and DSISR when relevant, in order to not
loose them in case there is a Data TLB Miss once the translation is
reactivated.
This patch adds fields in thread struct for saving those registers.
It prepares entry_32.S to handle exception entry with
Data MMU Translation enabled and alters EXCEPTION_PROLOG macros to
save SRR0, SRR1, DAR and DSISR then reenables Data MMU.
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/a775a1fea60f190e0f63503463fb775310a2009b.1576916812.git.christophe.leroy@c-s.fr
Diffstat (limited to 'arch/powerpc/include/asm/processor.h')
| -rw-r--r-- | arch/powerpc/include/asm/processor.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h index e114eb36721c..8387698bd5b6 100644 --- a/arch/powerpc/include/asm/processor.h +++ b/arch/powerpc/include/asm/processor.h @@ -163,6 +163,12 @@ struct thread_struct { #if defined(CONFIG_PPC_BOOK3S_32) && defined(CONFIG_PPC_KUAP) unsigned long kuap; /* opened segments for user access */ #endif +#ifdef CONFIG_VMAP_STACK + unsigned long srr0; + unsigned long srr1; + unsigned long dar; + unsigned long dsisr; +#endif /* Debug Registers */ struct debug_reg debug; struct thread_fp_state fp_state; |