Move r13 load after the call to FIND_PTE, and use r13 instead of r10 for storing fault address. This will allow using r10 freely in FIND_PTE in following patch to handle hugepage size. Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx> --- v5: New --- arch/powerpc/kernel/head_85xx.S | 30 ++++++++++++++++-------------- 1 file changed, 16 insertions(+), 14 deletions(-) diff --git a/arch/powerpc/kernel/head_85xx.S b/arch/powerpc/kernel/head_85xx.S index 282e49c51deb..226f88e77d6d 100644 --- a/arch/powerpc/kernel/head_85xx.S +++ b/arch/powerpc/kernel/head_85xx.S @@ -294,9 +294,10 @@ set_ivor: /* Macros to hide the PTE size differences * * FIND_PTE -- walks the page tables given EA & pgdir pointer - * r10 -- EA of fault + * r10 -- free * r11 -- PGDIR pointer * r12 -- free + * r13 -- EA of fault * label 2: is the bailout case * * if we find the pte (fall through): @@ -307,7 +308,7 @@ set_ivor: #ifdef CONFIG_PTE_64BIT #ifdef CONFIG_HUGETLB_PAGE #define FIND_PTE \ - rlwinm r12, r10, 14, 18, 28; /* Compute pgdir/pmd offset */ \ + rlwinm r12, r13, 14, 18, 28; /* Compute pgdir/pmd offset */ \ add r12, r11, r12; \ lwz r11, 4(r12); /* Get pgd/pmd entry */ \ rlwinm. r12, r11, 0, 0, 20; /* Extract pt base address */ \ @@ -317,26 +318,26 @@ set_ivor: andi. r10, r11, HUGEPD_SHIFT_MASK@l; /* extract size field */ \ xor r12, r10, r11; /* drop size bits from pointer */ \ b 1001f; \ -1000: rlwimi r12, r10, 23, 20, 28; /* Compute pte address */ \ +1000: rlwimi r12, r13, 23, 20, 28; /* Compute pte address */ \ li r10, 0; /* clear r10 */ \ 1001: lwz r11, 4(r12); /* Get pte entry */ #else #define FIND_PTE \ - rlwinm r12, r10, 14, 18, 28; /* Compute pgdir/pmd offset */ \ + rlwinm r12, r13, 14, 18, 28; /* Compute pgdir/pmd offset */ \ add r12, r11, r12; \ lwz r11, 4(r12); /* Get pgd/pmd entry */ \ rlwinm. r12, r11, 0, 0, 20; /* Extract pt base address */ \ beq 2f; /* Bail if no table */ \ - rlwimi r12, r10, 23, 20, 28; /* Compute pte address */ \ + rlwimi r12, r13, 23, 20, 28; /* Compute pte address */ \ lwz r11, 4(r12); /* Get pte entry */ #endif /* HUGEPAGE */ #else /* !PTE_64BIT */ #define FIND_PTE \ - rlwimi r11, r10, 12, 20, 29; /* Create L1 (pgdir/pmd) address */ \ + rlwimi r11, r13, 12, 20, 29; /* Create L1 (pgdir/pmd) address */ \ lwz r11, 0(r11); /* Get L1 entry */ \ rlwinm. r12, r11, 0, 0, 19; /* Extract L2 (pte) base address */ \ beq 2f; /* Bail if no table */ \ - rlwimi r12, r10, 22, 20, 29; /* Compute PTE address */ \ + rlwimi r12, r13, 22, 20, 29; /* Compute PTE address */ \ lwz r11, 0(r12); /* Get Linux PTE */ #endif @@ -443,13 +444,13 @@ START_BTB_FLUSH_SECTION BTB_FLUSH(r10) 1: END_BTB_FLUSH_SECTION - mfspr r10, SPRN_DEAR /* Get faulting address */ + mfspr r13, SPRN_DEAR /* Get faulting address */ /* If we are faulting a kernel address, we have to use the * kernel page tables. */ lis r11, PAGE_OFFSET@h - cmplw 5, r10, r11 + cmplw 5, r13, r11 blt 5, 3f lis r11, swapper_pg_dir@h ori r11, r11, swapper_pg_dir@l @@ -472,14 +473,14 @@ END_BTB_FLUSH_SECTION #endif 4: + FIND_PTE + #ifdef CONFIG_PTE_64BIT li r13,_PAGE_PRESENT|_PAGE_BAP_SR oris r13,r13,_PAGE_ACCESSED@h #else li r13,_PAGE_PRESENT|_PAGE_READ|_PAGE_ACCESSED #endif - - FIND_PTE andc. r13,r13,r11 /* Check permission */ #ifdef CONFIG_PTE_64BIT @@ -536,13 +537,13 @@ START_BTB_FLUSH_SECTION 1: END_BTB_FLUSH_SECTION - mfspr r10, SPRN_SRR0 /* Get faulting address */ + mfspr r13, SPRN_SRR0 /* Get faulting address */ /* If we are faulting a kernel address, we have to use the * kernel page tables. */ lis r11, PAGE_OFFSET@h - cmplw 5, r10, r11 + cmplw 5, r13, r11 blt 5, 3f lis r11, swapper_pg_dir@h ori r11, r11, swapper_pg_dir@l @@ -551,6 +552,7 @@ END_BTB_FLUSH_SECTION rlwinm r12,r12,0,16,1 mtspr SPRN_MAS1,r12 + FIND_PTE /* Make up the required permissions for kernel code */ #ifdef CONFIG_PTE_64BIT li r13,_PAGE_PRESENT | _PAGE_BAP_SX @@ -571,6 +573,7 @@ END_BTB_FLUSH_SECTION beq 2f /* KUAP fault */ #endif + FIND_PTE /* Make up the required permissions for user code */ #ifdef CONFIG_PTE_64BIT li r13,_PAGE_PRESENT | _PAGE_BAP_UX @@ -580,7 +583,6 @@ END_BTB_FLUSH_SECTION #endif 4: - FIND_PTE andc. r13,r13,r11 /* Check permission */ #ifdef CONFIG_PTE_64BIT -- 2.44.0
