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Diffstat (limited to 'arch/sparc64/mm/fault.c')
-rw-r--r--arch/sparc64/mm/fault.c440
1 files changed, 0 insertions, 440 deletions
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 <asm/head.h>
-
-#include <linux/string.h>
-#include <linux/types.h>
-#include <linux/sched.h>
-#include <linux/ptrace.h>
-#include <linux/mman.h>
-#include <linux/signal.h>
-#include <linux/mm.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/kprobes.h>
-#include <linux/kdebug.h>
-
-#include <asm/page.h>
-#include <asm/pgtable.h>
-#include <asm/openprom.h>
-#include <asm/oplib.h>
-#include <asm/uaccess.h>
-#include <asm/asi.h>
-#include <asm/lsu.h>
-#include <asm/sections.h>
-#include <asm/mmu_context.h>
-
-#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;
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-29 22:45:58 +0000