From 27137e5285a3388e8f86d7bc5fe0ed8b92bd4624 Mon Sep 17 00:00:00 2001 From: Sam Ravnborg Date: Sun, 16 Nov 2008 20:08:45 -0800 Subject: sparc,sparc64: unify mm/ - move all sparc64/mm/ files to arch/sparc/mm/ - commonly named files are named _64.c - add files to sparc/mm/Makefile preserving link order - delete now unused sparc64/mm/Makefile - sparc64 now finds mm/ in sparc Signed-off-by: Sam Ravnborg Signed-off-by: David S. Miller --- arch/sparc64/mm/fault.c | 440 ------------------------------------------------ 1 file changed, 440 deletions(-) delete mode 100644 arch/sparc64/mm/fault.c (limited to 'arch/sparc64/mm/fault.c') diff --git a/arch/sparc64/mm/fault.c b/arch/sparc64/mm/fault.c deleted file mode 100644 index a9e474bf638..00000000000 --- a/arch/sparc64/mm/fault.c +++ /dev/null @@ -1,440 +0,0 @@ -/* - * arch/sparc64/mm/fault.c: Page fault handlers for the 64-bit Sparc. - * - * Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net) - * Copyright (C) 1997, 1999 Jakub Jelinek (jj@ultra.linux.cz) - */ - -#include - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#ifdef CONFIG_KPROBES -static inline int notify_page_fault(struct pt_regs *regs) -{ - int ret = 0; - - /* kprobe_running() needs smp_processor_id() */ - if (!user_mode(regs)) { - preempt_disable(); - if (kprobe_running() && kprobe_fault_handler(regs, 0)) - ret = 1; - preempt_enable(); - } - return ret; -} -#else -static inline int notify_page_fault(struct pt_regs *regs) -{ - return 0; -} -#endif - -static void __kprobes unhandled_fault(unsigned long address, - struct task_struct *tsk, - struct pt_regs *regs) -{ - if ((unsigned long) address < PAGE_SIZE) { - printk(KERN_ALERT "Unable to handle kernel NULL " - "pointer dereference\n"); - } else { - printk(KERN_ALERT "Unable to handle kernel paging request " - "at virtual address %016lx\n", (unsigned long)address); - } - printk(KERN_ALERT "tsk->{mm,active_mm}->context = %016lx\n", - (tsk->mm ? - CTX_HWBITS(tsk->mm->context) : - CTX_HWBITS(tsk->active_mm->context))); - printk(KERN_ALERT "tsk->{mm,active_mm}->pgd = %016lx\n", - (tsk->mm ? (unsigned long) tsk->mm->pgd : - (unsigned long) tsk->active_mm->pgd)); - die_if_kernel("Oops", regs); -} - -static void bad_kernel_pc(struct pt_regs *regs, unsigned long vaddr) -{ - printk(KERN_CRIT "OOPS: Bogus kernel PC [%016lx] in fault handler\n", - regs->tpc); - printk(KERN_CRIT "OOPS: RPC [%016lx]\n", regs->u_regs[15]); - printk("OOPS: RPC <%pS>\n", (void *) regs->u_regs[15]); - printk(KERN_CRIT "OOPS: Fault was to vaddr[%lx]\n", vaddr); - dump_stack(); - unhandled_fault(regs->tpc, current, regs); -} - -/* - * We now make sure that mmap_sem is held in all paths that call - * this. Additionally, to prevent kswapd from ripping ptes from - * under us, raise interrupts around the time that we look at the - * pte, kswapd will have to wait to get his smp ipi response from - * us. vmtruncate likewise. This saves us having to get pte lock. - */ -static unsigned int get_user_insn(unsigned long tpc) -{ - pgd_t *pgdp = pgd_offset(current->mm, tpc); - pud_t *pudp; - pmd_t *pmdp; - pte_t *ptep, pte; - unsigned long pa; - u32 insn = 0; - unsigned long pstate; - - if (pgd_none(*pgdp)) - goto outret; - pudp = pud_offset(pgdp, tpc); - if (pud_none(*pudp)) - goto outret; - pmdp = pmd_offset(pudp, tpc); - if (pmd_none(*pmdp)) - goto outret; - - /* This disables preemption for us as well. */ - __asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate)); - __asm__ __volatile__("wrpr %0, %1, %%pstate" - : : "r" (pstate), "i" (PSTATE_IE)); - ptep = pte_offset_map(pmdp, tpc); - pte = *ptep; - if (!pte_present(pte)) - goto out; - - pa = (pte_pfn(pte) << PAGE_SHIFT); - pa += (tpc & ~PAGE_MASK); - - /* Use phys bypass so we don't pollute dtlb/dcache. */ - __asm__ __volatile__("lduwa [%1] %2, %0" - : "=r" (insn) - : "r" (pa), "i" (ASI_PHYS_USE_EC)); - -out: - pte_unmap(ptep); - __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate)); -outret: - return insn; -} - -extern unsigned long compute_effective_address(struct pt_regs *, unsigned int, unsigned int); - -static void do_fault_siginfo(int code, int sig, struct pt_regs *regs, - unsigned int insn, int fault_code) -{ - siginfo_t info; - - info.si_code = code; - info.si_signo = sig; - info.si_errno = 0; - if (fault_code & FAULT_CODE_ITLB) - info.si_addr = (void __user *) regs->tpc; - else - info.si_addr = (void __user *) - compute_effective_address(regs, insn, 0); - info.si_trapno = 0; - force_sig_info(sig, &info, current); -} - -extern int handle_ldf_stq(u32, struct pt_regs *); -extern int handle_ld_nf(u32, struct pt_regs *); - -static unsigned int get_fault_insn(struct pt_regs *regs, unsigned int insn) -{ - if (!insn) { - if (!regs->tpc || (regs->tpc & 0x3)) - return 0; - if (regs->tstate & TSTATE_PRIV) { - insn = *(unsigned int *) regs->tpc; - } else { - insn = get_user_insn(regs->tpc); - } - } - return insn; -} - -static void do_kernel_fault(struct pt_regs *regs, int si_code, int fault_code, - unsigned int insn, unsigned long address) -{ - unsigned char asi = ASI_P; - - if ((!insn) && (regs->tstate & TSTATE_PRIV)) - goto cannot_handle; - - /* If user insn could be read (thus insn is zero), that - * is fine. We will just gun down the process with a signal - * in that case. - */ - - if (!(fault_code & (FAULT_CODE_WRITE|FAULT_CODE_ITLB)) && - (insn & 0xc0800000) == 0xc0800000) { - if (insn & 0x2000) - asi = (regs->tstate >> 24); - else - asi = (insn >> 5); - if ((asi & 0xf2) == 0x82) { - if (insn & 0x1000000) { - handle_ldf_stq(insn, regs); - } else { - /* This was a non-faulting load. Just clear the - * destination register(s) and continue with the next - * instruction. -jj - */ - handle_ld_nf(insn, regs); - } - return; - } - } - - /* Is this in ex_table? */ - if (regs->tstate & TSTATE_PRIV) { - const struct exception_table_entry *entry; - - entry = search_exception_tables(regs->tpc); - if (entry) { - regs->tpc = entry->fixup; - regs->tnpc = regs->tpc + 4; - return; - } - } else { - /* The si_code was set to make clear whether - * this was a SEGV_MAPERR or SEGV_ACCERR fault. - */ - do_fault_siginfo(si_code, SIGSEGV, regs, insn, fault_code); - return; - } - -cannot_handle: - unhandled_fault (address, current, regs); -} - -asmlinkage void __kprobes do_sparc64_fault(struct pt_regs *regs) -{ - struct mm_struct *mm = current->mm; - struct vm_area_struct *vma; - unsigned int insn = 0; - int si_code, fault_code, fault; - unsigned long address, mm_rss; - - fault_code = get_thread_fault_code(); - - if (notify_page_fault(regs)) - return; - - si_code = SEGV_MAPERR; - address = current_thread_info()->fault_address; - - if ((fault_code & FAULT_CODE_ITLB) && - (fault_code & FAULT_CODE_DTLB)) - BUG(); - - if (regs->tstate & TSTATE_PRIV) { - unsigned long tpc = regs->tpc; - - /* Sanity check the PC. */ - if ((tpc >= KERNBASE && tpc < (unsigned long) __init_end) || - (tpc >= MODULES_VADDR && tpc < MODULES_END)) { - /* Valid, no problems... */ - } else { - bad_kernel_pc(regs, address); - return; - } - } - - /* - * If we're in an interrupt or have no user - * context, we must not take the fault.. - */ - if (in_atomic() || !mm) - goto intr_or_no_mm; - - if (test_thread_flag(TIF_32BIT)) { - if (!(regs->tstate & TSTATE_PRIV)) - regs->tpc &= 0xffffffff; - address &= 0xffffffff; - } - - if (!down_read_trylock(&mm->mmap_sem)) { - if ((regs->tstate & TSTATE_PRIV) && - !search_exception_tables(regs->tpc)) { - insn = get_fault_insn(regs, insn); - goto handle_kernel_fault; - } - down_read(&mm->mmap_sem); - } - - vma = find_vma(mm, address); - if (!vma) - goto bad_area; - - /* Pure DTLB misses do not tell us whether the fault causing - * load/store/atomic was a write or not, it only says that there - * was no match. So in such a case we (carefully) read the - * instruction to try and figure this out. It's an optimization - * so it's ok if we can't do this. - * - * Special hack, window spill/fill knows the exact fault type. - */ - if (((fault_code & - (FAULT_CODE_DTLB | FAULT_CODE_WRITE | FAULT_CODE_WINFIXUP)) == FAULT_CODE_DTLB) && - (vma->vm_flags & VM_WRITE) != 0) { - insn = get_fault_insn(regs, 0); - if (!insn) - goto continue_fault; - /* All loads, stores and atomics have bits 30 and 31 both set - * in the instruction. Bit 21 is set in all stores, but we - * have to avoid prefetches which also have bit 21 set. - */ - if ((insn & 0xc0200000) == 0xc0200000 && - (insn & 0x01780000) != 0x01680000) { - /* Don't bother updating thread struct value, - * because update_mmu_cache only cares which tlb - * the access came from. - */ - fault_code |= FAULT_CODE_WRITE; - } - } -continue_fault: - - if (vma->vm_start <= address) - goto good_area; - if (!(vma->vm_flags & VM_GROWSDOWN)) - goto bad_area; - if (!(fault_code & FAULT_CODE_WRITE)) { - /* Non-faulting loads shouldn't expand stack. */ - insn = get_fault_insn(regs, insn); - if ((insn & 0xc0800000) == 0xc0800000) { - unsigned char asi; - - if (insn & 0x2000) - asi = (regs->tstate >> 24); - else - asi = (insn >> 5); - if ((asi & 0xf2) == 0x82) - goto bad_area; - } - } - if (expand_stack(vma, address)) - goto bad_area; - /* - * Ok, we have a good vm_area for this memory access, so - * we can handle it.. - */ -good_area: - si_code = SEGV_ACCERR; - - /* If we took a ITLB miss on a non-executable page, catch - * that here. - */ - if ((fault_code & FAULT_CODE_ITLB) && !(vma->vm_flags & VM_EXEC)) { - BUG_ON(address != regs->tpc); - BUG_ON(regs->tstate & TSTATE_PRIV); - goto bad_area; - } - - if (fault_code & FAULT_CODE_WRITE) { - if (!(vma->vm_flags & VM_WRITE)) - goto bad_area; - - /* Spitfire has an icache which does not snoop - * processor stores. Later processors do... - */ - if (tlb_type == spitfire && - (vma->vm_flags & VM_EXEC) != 0 && - vma->vm_file != NULL) - set_thread_fault_code(fault_code | - FAULT_CODE_BLKCOMMIT); - } else { - /* Allow reads even for write-only mappings */ - if (!(vma->vm_flags & (VM_READ | VM_EXEC))) - goto bad_area; - } - - fault = handle_mm_fault(mm, vma, address, (fault_code & FAULT_CODE_WRITE)); - if (unlikely(fault & VM_FAULT_ERROR)) { - if (fault & VM_FAULT_OOM) - goto out_of_memory; - else if (fault & VM_FAULT_SIGBUS) - goto do_sigbus; - BUG(); - } - if (fault & VM_FAULT_MAJOR) - current->maj_flt++; - else - current->min_flt++; - - up_read(&mm->mmap_sem); - - mm_rss = get_mm_rss(mm); -#ifdef CONFIG_HUGETLB_PAGE - mm_rss -= (mm->context.huge_pte_count * (HPAGE_SIZE / PAGE_SIZE)); -#endif - if (unlikely(mm_rss > - mm->context.tsb_block[MM_TSB_BASE].tsb_rss_limit)) - tsb_grow(mm, MM_TSB_BASE, mm_rss); -#ifdef CONFIG_HUGETLB_PAGE - mm_rss = mm->context.huge_pte_count; - if (unlikely(mm_rss > - mm->context.tsb_block[MM_TSB_HUGE].tsb_rss_limit)) - tsb_grow(mm, MM_TSB_HUGE, mm_rss); -#endif - return; - - /* - * Something tried to access memory that isn't in our memory map.. - * Fix it, but check if it's kernel or user first.. - */ -bad_area: - insn = get_fault_insn(regs, insn); - up_read(&mm->mmap_sem); - -handle_kernel_fault: - do_kernel_fault(regs, si_code, fault_code, insn, address); - return; - -/* - * We ran out of memory, or some other thing happened to us that made - * us unable to handle the page fault gracefully. - */ -out_of_memory: - insn = get_fault_insn(regs, insn); - up_read(&mm->mmap_sem); - printk("VM: killing process %s\n", current->comm); - if (!(regs->tstate & TSTATE_PRIV)) - do_group_exit(SIGKILL); - goto handle_kernel_fault; - -intr_or_no_mm: - insn = get_fault_insn(regs, 0); - goto handle_kernel_fault; - -do_sigbus: - insn = get_fault_insn(regs, insn); - up_read(&mm->mmap_sem); - - /* - * Send a sigbus, regardless of whether we were in kernel - * or user mode. - */ - do_fault_siginfo(BUS_ADRERR, SIGBUS, regs, insn, fault_code); - - /* Kernel mode? Handle exceptions or die */ - if (regs->tstate & TSTATE_PRIV) - goto handle_kernel_fault; -} -- cgit v1.2.3