diff options
| author | Christophe Leroy | 2021-03-12 12:50:22 +0000 |
|---|---|---|
| committer | Michael Ellerman | 2021-03-29 13:22:05 +1100 |
| commit | 7aa8dd67f15731f659390018b5c9fd95f5975b3d (patch) | |
| tree | dae28ba3fe83b21967409a57738f19d28e7a1b1d /arch/powerpc/kernel/head_book3s_32.S | |
| parent | 5747230645562921b5bc19f6409f7af08fe17c6d (diff) | |
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_book3s_32.S')
| -rw-r--r-- | arch/powerpc/kernel/head_book3s_32.S | 47 |
1 files changed, 2 insertions, 45 deletions
diff --git a/arch/powerpc/kernel/head_book3s_32.S b/arch/powerpc/kernel/head_book3s_32.S index 565e84e20a72..1cf7bd5d5ec1 100644 --- a/arch/powerpc/kernel/head_book3s_32.S +++ b/arch/powerpc/kernel/head_book3s_32.S @@ -260,21 +260,14 @@ __secondary_hold_acknowledge: MachineCheck: EXCEPTION_PROLOG_0 #ifdef CONFIG_PPC_CHRP -#ifdef CONFIG_VMAP_STACK mtspr SPRN_SPRG_SCRATCH2,r1 mfspr r1, SPRN_SPRG_THREAD lwz r1, RTAS_SP(r1) cmpwi cr1, r1, 0 bne cr1, 7f mfspr r1, SPRN_SPRG_SCRATCH2 -#else - mfspr r11, SPRN_SPRG_THREAD - lwz r11, RTAS_SP(r11) - cmpwi cr1, r11, 0 - bne cr1, 7f -#endif #endif /* CONFIG_PPC_CHRP */ - EXCEPTION_PROLOG_1 for_rtas=1 + EXCEPTION_PROLOG_1 7: EXCEPTION_PROLOG_2 addi r3,r1,STACK_FRAME_OVERHEAD #ifdef CONFIG_PPC_CHRP @@ -288,7 +281,6 @@ MachineCheck: . = 0x300 DO_KVM 0x300 DataAccess: -#ifdef CONFIG_VMAP_STACK #ifdef CONFIG_PPC_BOOK3S_604 BEGIN_MMU_FTR_SECTION mtspr SPRN_SPRG_SCRATCH2,r10 @@ -310,29 +302,11 @@ ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_HPTE_TABLE) 1: EXCEPTION_PROLOG_0 handle_dar_dsisr=1 EXCEPTION_PROLOG_1 b handle_page_fault_tramp_1 -#else /* CONFIG_VMAP_STACK */ - EXCEPTION_PROLOG handle_dar_dsisr=1 - get_and_save_dar_dsisr_on_stack r4, r5, r11 -#ifdef CONFIG_PPC_BOOK3S_604 -BEGIN_MMU_FTR_SECTION - andis. r0, r5, (DSISR_BAD_FAULT_32S | DSISR_DABRMATCH)@h - bne handle_page_fault_tramp_2 /* if not, try to put a PTE */ - rlwinm r3, r5, 32 - 15, 21, 21 /* DSISR_STORE -> _PAGE_RW */ - bl hash_page - b handle_page_fault_tramp_1 -MMU_FTR_SECTION_ELSE -#endif - b handle_page_fault_tramp_2 -#ifdef CONFIG_PPC_BOOK3S_604 -ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_HPTE_TABLE) -#endif -#endif /* CONFIG_VMAP_STACK */ /* Instruction access exception. */ . = 0x400 DO_KVM 0x400 InstructionAccess: -#ifdef CONFIG_VMAP_STACK mtspr SPRN_SPRG_SCRATCH0,r10 mtspr SPRN_SPRG_SCRATCH1,r11 mfspr r10, SPRN_SPRG_THREAD @@ -353,18 +327,6 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE) EXCEPTION_PROLOG_1 EXCEPTION_PROLOG_2 -#else /* CONFIG_VMAP_STACK */ - EXCEPTION_PROLOG - andis. r0,r9,SRR1_ISI_NOPT@h /* no pte found? */ - beq 1f /* if so, try to put a PTE */ - li r3,0 /* into the hash table */ - mr r4,r12 /* SRR0 is fault address */ -#ifdef CONFIG_PPC_BOOK3S_604 -BEGIN_MMU_FTR_SECTION - bl hash_page -END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE) -#endif -#endif /* CONFIG_VMAP_STACK */ andis. r5,r9,DSISR_SRR1_MATCH_32S@h /* Filter relevant SRR1 bits */ stw r5, _DSISR(r11) stw r12, _DAR(r11) @@ -378,7 +340,6 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE) DO_KVM 0x600 Alignment: EXCEPTION_PROLOG handle_dar_dsisr=1 - save_dar_dsisr_on_stack r4, r5, r11 addi r3,r1,STACK_FRAME_OVERHEAD b alignment_exception_tramp @@ -689,18 +650,13 @@ alignment_exception_tramp: EXC_XFER_STD(0x600, alignment_exception) handle_page_fault_tramp_1: -#ifdef CONFIG_VMAP_STACK EXCEPTION_PROLOG_2 handle_dar_dsisr=1 -#endif lwz r5, _DSISR(r11) - /* fall through */ -handle_page_fault_tramp_2: andis. r0, r5, DSISR_DABRMATCH@h bne- 1f EXC_XFER_LITE(0x300, handle_page_fault) 1: EXC_XFER_STD(0x300, do_break) -#ifdef CONFIG_VMAP_STACK #ifdef CONFIG_PPC_BOOK3S_604 .macro save_regs_thread thread stw r0, THR0(\thread) @@ -775,6 +731,7 @@ fast_hash_page_return: rfi #endif /* CONFIG_PPC_BOOK3S_604 */ +#ifdef CONFIG_VMAP_STACK stack_overflow: vmap_stack_overflow_exception #endif |