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| author |   Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-03-12 12:50:22 +0000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2021-03-29 13:22:05 +1100 |
| commit | 7aa8dd67f15731f659390018b5c9fd95f5975b3d (patch) | |
| tree | dae28ba3fe83b21967409a57738f19d28e7a1b1d /arch/powerpc/kernel/entry_32.S | |
| parent | powerpc/32: Remove ksp_limit (diff) | |
| download | linux-dev-7aa8dd67f15731f659390018b5c9fd95f5975b3d.tar.xz linux-dev-7aa8dd67f15731f659390018b5c9fd95f5975b3d.zip | |
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/entry_32.S')
| -rw-r--r-- | arch/powerpc/kernel/entry_32.S | 19 |
1 files changed, 7 insertions, 12 deletions
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S index 66198e6e25e7..33e97032ca25 100644 --- a/arch/powerpc/kernel/entry_32.S +++ b/arch/powerpc/kernel/entry_32.S @@ -129,7 +129,7 @@ transfer_to_handler: stw r12,_CTR(r11) stw r2,_XER(r11) mfspr r12,SPRN_SPRG_THREAD - tovirt_vmstack r12, r12 + tovirt(r12, r12) beq 2f /* if from user, fix up THREAD.regs */ addi r2, r12, -THREAD addi r11,r1,STACK_FRAME_OVERHEAD @@ -153,8 +153,7 @@ transfer_to_handler: transfer_to_handler_cont: 3: mflr r9 - tovirt_novmstack r2, r2 /* set r2 to current */ - tovirt_vmstack r9, r9 + tovirt(r9, r9) lwz r11,0(r9) /* virtual address of handler */ lwz r9,4(r9) /* where to go when done */ #if defined(CONFIG_PPC_8xx) && defined(CONFIG_PERF_EVENTS) @@ -933,7 +932,6 @@ _GLOBAL(enter_rtas) lis r6,1f@ha /* physical return address for rtas */ addi r6,r6,1f@l tophys(r6,r6) - tophys_novmstack r7, r1 lwz r8,RTASENTRY(r4) lwz r4,RTASBASE(r4) mfmsr r9 @@ -942,22 +940,19 @@ _GLOBAL(enter_rtas) mtmsr r0 /* disable interrupts so SRR0/1 don't get trashed */ li r9,MSR_KERNEL & ~(MSR_IR|MSR_DR) mtlr r6 - stw r7, THREAD + RTAS_SP(r2) + stw r1, THREAD + RTAS_SP(r2) mtspr SPRN_SRR0,r8 mtspr SPRN_SRR1,r9 rfi -1: tophys_novmstack r9, r1 -#ifdef CONFIG_VMAP_STACK +1: li r0, MSR_KERNEL & ~MSR_IR /* can take DTLB miss */ mtmsr r0 isync -#endif - lwz r8,INT_FRAME_SIZE+4(r9) /* get return address */ - lwz r9,8(r9) /* original msr value */ + lwz r8,INT_FRAME_SIZE+4(r1) /* get return address */ + lwz r9,8(r1) /* original msr value */ addi r1,r1,INT_FRAME_SIZE li r0,0 - tophys_novmstack r7, r2 - stw r0, THREAD + RTAS_SP(r7) + stw r0, THREAD + RTAS_SP(r2) mtspr SPRN_SRR0,r8 mtspr SPRN_SRR1,r9 rfi /* return to caller */ |