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Diffstat (limited to 'arch/sparc64/mm/fault.c')
-rw-r--r--arch/sparc64/mm/fault.c527
1 files changed, 527 insertions, 0 deletions
diff --git a/arch/sparc64/mm/fault.c b/arch/sparc64/mm/fault.c
new file mode 100644
index 000000000000..3ffee7b51aed
--- /dev/null
+++ b/arch/sparc64/mm/fault.c
@@ -0,0 +1,527 @@
+/* $Id: fault.c,v 1.59 2002/02/09 19:49:31 davem Exp $
+ * arch/sparc64/mm/fault.c: Page fault handlers for the 64-bit Sparc.
+ *
+ * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
+ * 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/smp_lock.h>
+#include <linux/init.h>
+#include <linux/interrupt.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/kdebug.h>
+
+#define ELEMENTS(arr) (sizeof (arr)/sizeof (arr[0]))
+
+extern struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS];
+
+/*
+ * To debug kernel during syscall entry.
+ */
+void syscall_trace_entry(struct pt_regs *regs)
+{
+ printk("scall entry: %s[%d]/cpu%d: %d\n", current->comm, current->pid, smp_processor_id(), (int) regs->u_regs[UREG_G1]);
+}
+
+/*
+ * To debug kernel during syscall exit.
+ */
+void syscall_trace_exit(struct pt_regs *regs)
+{
+ printk("scall exit: %s[%d]/cpu%d: %d\n", current->comm, current->pid, smp_processor_id(), (int) regs->u_regs[UREG_G1]);
+}
+
+/*
+ * To debug kernel to catch accesses to certain virtual/physical addresses.
+ * Mode = 0 selects physical watchpoints, mode = 1 selects virtual watchpoints.
+ * flags = VM_READ watches memread accesses, flags = VM_WRITE watches memwrite accesses.
+ * Caller passes in a 64bit aligned addr, with mask set to the bytes that need to be
+ * watched. This is only useful on a single cpu machine for now. After the watchpoint
+ * is detected, the process causing it will be killed, thus preventing an infinite loop.
+ */
+void set_brkpt(unsigned long addr, unsigned char mask, int flags, int mode)
+{
+ unsigned long lsubits;
+
+ __asm__ __volatile__("ldxa [%%g0] %1, %0"
+ : "=r" (lsubits)
+ : "i" (ASI_LSU_CONTROL));
+ lsubits &= ~(LSU_CONTROL_PM | LSU_CONTROL_VM |
+ LSU_CONTROL_PR | LSU_CONTROL_VR |
+ LSU_CONTROL_PW | LSU_CONTROL_VW);
+
+ __asm__ __volatile__("stxa %0, [%1] %2\n\t"
+ "membar #Sync"
+ : /* no outputs */
+ : "r" (addr), "r" (mode ? VIRT_WATCHPOINT : PHYS_WATCHPOINT),
+ "i" (ASI_DMMU));
+
+ lsubits |= ((unsigned long)mask << (mode ? 25 : 33));
+ if (flags & VM_READ)
+ lsubits |= (mode ? LSU_CONTROL_VR : LSU_CONTROL_PR);
+ if (flags & VM_WRITE)
+ lsubits |= (mode ? LSU_CONTROL_VW : LSU_CONTROL_PW);
+ __asm__ __volatile__("stxa %0, [%%g0] %1\n\t"
+ "membar #Sync"
+ : /* no outputs */
+ : "r" (lsubits), "i" (ASI_LSU_CONTROL)
+ : "memory");
+}
+
+/* Nice, simple, prom library does all the sweating for us. ;) */
+unsigned long __init prom_probe_memory (void)
+{
+ register struct linux_mlist_p1275 *mlist;
+ register unsigned long bytes, base_paddr, tally;
+ register int i;
+
+ i = 0;
+ mlist = *prom_meminfo()->p1275_available;
+ bytes = tally = mlist->num_bytes;
+ base_paddr = mlist->start_adr;
+
+ sp_banks[0].base_addr = base_paddr;
+ sp_banks[0].num_bytes = bytes;
+
+ while (mlist->theres_more != (void *) 0) {
+ i++;
+ mlist = mlist->theres_more;
+ bytes = mlist->num_bytes;
+ tally += bytes;
+ if (i >= SPARC_PHYS_BANKS-1) {
+ printk ("The machine has more banks than "
+ "this kernel can support\n"
+ "Increase the SPARC_PHYS_BANKS "
+ "setting (currently %d)\n",
+ SPARC_PHYS_BANKS);
+ i = SPARC_PHYS_BANKS-1;
+ break;
+ }
+
+ sp_banks[i].base_addr = mlist->start_adr;
+ sp_banks[i].num_bytes = mlist->num_bytes;
+ }
+
+ i++;
+ sp_banks[i].base_addr = 0xdeadbeefbeefdeadUL;
+ sp_banks[i].num_bytes = 0;
+
+ /* Now mask all bank sizes on a page boundary, it is all we can
+ * use anyways.
+ */
+ for (i = 0; sp_banks[i].num_bytes != 0; i++)
+ sp_banks[i].num_bytes &= PAGE_MASK;
+
+ return tally;
+}
+
+static void 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));
+ if (notify_die(DIE_GPF, "general protection fault", regs,
+ 0, 0, SIGSEGV) == NOTIFY_STOP)
+ return;
+ die_if_kernel("Oops", regs);
+}
+
+static void bad_kernel_pc(struct pt_regs *regs)
+{
+ unsigned long *ksp;
+
+ printk(KERN_CRIT "OOPS: Bogus kernel PC [%016lx] in fault handler\n",
+ regs->tpc);
+ __asm__("mov %%sp, %0" : "=r" (ksp));
+ show_stack(current, ksp);
+ 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. This saves us having to get page_table_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_val(pte) & _PAGE_PADDR);
+ 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 long g2;
+ 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;
+ }
+ }
+
+ g2 = regs->u_regs[UREG_G2];
+
+ /* Is this in ex_table? */
+ if (regs->tstate & TSTATE_PRIV) {
+ unsigned long fixup;
+
+ if (asi == ASI_P && (insn & 0xc0800000) == 0xc0800000) {
+ if (insn & 0x2000)
+ asi = (regs->tstate >> 24);
+ else
+ asi = (insn >> 5);
+ }
+
+ /* Look in asi.h: All _S asis have LS bit set */
+ if ((asi & 0x1) &&
+ (fixup = search_extables_range(regs->tpc, &g2))) {
+ regs->tpc = fixup;
+ regs->tnpc = regs->tpc + 4;
+ regs->u_regs[UREG_G2] = g2;
+ 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 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;
+ unsigned long address;
+
+ fault_code = get_thread_fault_code();
+
+ if (notify_die(DIE_PAGE_FAULT, "page_fault", regs,
+ fault_code, 0, SIGSEGV) == NOTIFY_STOP)
+ 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) _etext) ||
+ (tpc >= MODULES_VADDR && tpc < MODULES_END)) {
+ /* Valid, no problems... */
+ } else {
+ bad_kernel_pc(regs);
+ 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;
+ if ((insn & 0xc0200000) == 0xc0200000 &&
+ (insn & 0x1780000) != 0x1680000) {
+ /* 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;
+ }
+
+ switch (handle_mm_fault(mm, vma, address, (fault_code & FAULT_CODE_WRITE))) {
+ case VM_FAULT_MINOR:
+ current->min_flt++;
+ break;
+ case VM_FAULT_MAJOR:
+ current->maj_flt++;
+ break;
+ case VM_FAULT_SIGBUS:
+ goto do_sigbus;
+ case VM_FAULT_OOM:
+ goto out_of_memory;
+ default:
+ BUG();
+ }
+
+ up_read(&mm->mmap_sem);
+ goto fault_done;
+
+ /*
+ * 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);
+
+ goto fault_done;
+
+/*
+ * 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_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;
+
+fault_done:
+ /* These values are no longer needed, clear them. */
+ set_thread_fault_code(0);
+ current_thread_info()->fault_address = 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-18 23:21:05 +0000