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| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2019-12-21 09:32:27 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-01-26 12:15:09 +0100 |
| commit | 028474876f472c3b6eee633aed528a1206609657 (patch) | |
| tree | ddf5742f1232e48a0665eb5b0a157caa28567a17 /arch/powerpc/kernel/asm-offsets.c | |
| parent | powerpc/32: add a macro to get and/or save DAR and DSISR on stack. (diff) | |
| download | linux-028474876f472c3b6eee633aed528a1206609657.tar.xz 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/kernel/asm-offsets.c')
| -rw-r--r-- | arch/powerpc/kernel/asm-offsets.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c index 90e53d432f2e..c25e562f1cd9 100644 --- a/arch/powerpc/kernel/asm-offsets.c +++ b/arch/powerpc/kernel/asm-offsets.c @@ -127,6 +127,12 @@ int main(void) OFFSET(KSP_VSID, thread_struct, ksp_vsid); #else /* CONFIG_PPC64 */ OFFSET(PGDIR, thread_struct, pgdir); +#ifdef CONFIG_VMAP_STACK + OFFSET(SRR0, thread_struct, srr0); + OFFSET(SRR1, thread_struct, srr1); + OFFSET(DAR, thread_struct, dar); + OFFSET(DSISR, thread_struct, dsisr); +#endif #ifdef CONFIG_SPE OFFSET(THREAD_EVR0, thread_struct, evr[0]); OFFSET(THREAD_ACC, thread_struct, acc); |