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| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2019-12-21 11:32:24 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-01-26 14:15:09 +0300 |
| commit | 1ca9db5b6556c38aacac4c50a617aa3f7efbb306 (patch) | |
| tree | e30f1cceb941cbe5688530fecbdc3eb92b65a704 /arch/powerpc/kernel/head_40x.S | |
| parent | 1f1c4d0122eebd204468684f21f0270ea8a4999d (diff) | |
| download | linux-1ca9db5b6556c38aacac4c50a617aa3f7efbb306.tar.xz | |
powerpc/32: save DEAR/DAR before calling handle_page_fault
handle_page_fault() is the only function that save DAR/DEAR itself.
Save DAR/DEAR before calling handle_page_fault() to prepare for
VMAP stack which will require to save even before.
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/3a4d58d378091086f00fde42b59610c80289e120.1576916812.git.christophe.leroy@c-s.fr
Diffstat (limited to 'arch/powerpc/kernel/head_40x.S')
| -rw-r--r-- | arch/powerpc/kernel/head_40x.S | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S index 585ea1976550..9bb663977e84 100644 --- a/arch/powerpc/kernel/head_40x.S +++ b/arch/powerpc/kernel/head_40x.S @@ -313,6 +313,7 @@ _ENTRY(saved_ksp_limit) START_EXCEPTION(0x0400, InstructionAccess) EXCEPTION_PROLOG mr r4,r12 /* Pass SRR0 as arg2 */ + stw r4, _DEAR(r11) li r5,0 /* Pass zero as arg3 */ EXC_XFER_LITE(0x400, handle_page_fault) @@ -676,6 +677,7 @@ DataAccess: mfspr r5,SPRN_ESR /* Grab the ESR, save it, pass arg3 */ stw r5,_ESR(r11) mfspr r4,SPRN_DEAR /* Grab the DEAR, save it, pass arg2 */ + stw r4, _DEAR(r11) EXC_XFER_LITE(0x300, handle_page_fault) /* Other PowerPC processors, namely those derived from the 6xx-series |