dirty fix to merging

1 files changed, 597 insertions, 0 deletions

diff --git a/arch/sparc/mm/fault_32.c b/arch/sparc/mm/fault_32.c
new file mode 100644
index 00000000..df3155a1
--- /dev/null
+++ b/arch/sparc/mm/fault_32.c
@@ -0,0 +1,597 @@
+/*
+ * fault.c:  Page fault handlers for the Sparc.
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
+ * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.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/threads.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/perf_event.h>
+#include <linux/interrupt.h>
+#include <linux/kdebug.h>
+
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/memreg.h>
+#include <asm/openprom.h>
+#include <asm/oplib.h>
+#include <asm/smp.h>
+#include <asm/traps.h>
+#include <asm/uaccess.h>
+
+extern int prom_node_root;
+
+int show_unhandled_signals = 1;
+
+/* At boot time we determine these two values necessary for setting
+ * up the segment maps and page table entries (pte's).
+ */
+
+int num_segmaps, num_contexts;
+int invalid_segment;
+
+/* various Virtual Address Cache parameters we find at boot time... */
+
+int vac_size, vac_linesize, vac_do_hw_vac_flushes;
+int vac_entries_per_context, vac_entries_per_segment;
+int vac_entries_per_page;
+
+/* Return how much physical memory we have.  */
+unsigned long probe_memory(void)
+{
+	unsigned long total = 0;
+	int i;
+
+	for (i = 0; sp_banks[i].num_bytes; i++)
+		total += sp_banks[i].num_bytes;
+
+	return total;
+}
+
+extern void sun4c_complete_all_stores(void);
+
+/* Whee, a level 15 NMI interrupt memory error.  Let's have fun... */
+asmlinkage void sparc_lvl15_nmi(struct pt_regs *regs, unsigned long serr,
+				unsigned long svaddr, unsigned long aerr,
+				unsigned long avaddr)
+{
+	sun4c_complete_all_stores();
+	printk("FAULT: NMI received\n");
+	printk("SREGS: Synchronous Error %08lx\n", serr);
+	printk("       Synchronous Vaddr %08lx\n", svaddr);
+	printk("      Asynchronous Error %08lx\n", aerr);
+	printk("      Asynchronous Vaddr %08lx\n", avaddr);
+	if (sun4c_memerr_reg)
+		printk("     Memory Parity Error %08lx\n", *sun4c_memerr_reg);
+	printk("REGISTER DUMP:\n");
+	show_regs(regs);
+	prom_halt();
+}
+
+static void unhandled_fault(unsigned long, struct task_struct *,
+		struct pt_regs *) __attribute__ ((noreturn));
+
+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 %08lx\n", address);
+	}
+	printk(KERN_ALERT "tsk->{mm,active_mm}->context = %08lx\n",
+		(tsk->mm ? tsk->mm->context : tsk->active_mm->context));
+	printk(KERN_ALERT "tsk->{mm,active_mm}->pgd = %08lx\n",
+		(tsk->mm ? (unsigned long) tsk->mm->pgd :
+		 	(unsigned long) tsk->active_mm->pgd));
+	die_if_kernel("Oops", regs);
+}
+
+asmlinkage int lookup_fault(unsigned long pc, unsigned long ret_pc, 
+			    unsigned long address)
+{
+	struct pt_regs regs;
+	unsigned long g2;
+	unsigned int insn;
+	int i;
+	
+	i = search_extables_range(ret_pc, &g2);
+	switch (i) {
+	case 3:
+		/* load & store will be handled by fixup */
+		return 3;
+
+	case 1:
+		/* store will be handled by fixup, load will bump out */
+		/* for _to_ macros */
+		insn = *((unsigned int *) pc);
+		if ((insn >> 21) & 1)
+			return 1;
+		break;
+
+	case 2:
+		/* load will be handled by fixup, store will bump out */
+		/* for _from_ macros */
+		insn = *((unsigned int *) pc);
+		if (!((insn >> 21) & 1) || ((insn>>19)&0x3f) == 15)
+			return 2; 
+		break; 
+
+	default:
+		break;
+	}
+
+	memset(&regs, 0, sizeof (regs));
+	regs.pc = pc;
+	regs.npc = pc + 4;
+	__asm__ __volatile__(
+		"rd %%psr, %0\n\t"
+		"nop\n\t"
+		"nop\n\t"
+		"nop\n" : "=r" (regs.psr));
+	unhandled_fault(address, current, &regs);
+
+	/* Not reached */
+	return 0;
+}
+
+static inline void
+show_signal_msg(struct pt_regs *regs, int sig, int code,
+		unsigned long address, struct task_struct *tsk)
+{
+	if (!unhandled_signal(tsk, sig))
+		return;
+
+	if (!printk_ratelimit())
+		return;
+
+	printk("%s%s[%d]: segfault at %lx ip %p (rpc %p) sp %p error %x",
+	       task_pid_nr(tsk) > 1 ? KERN_INFO : KERN_EMERG,
+	       tsk->comm, task_pid_nr(tsk), address,
+	       (void *)regs->pc, (void *)regs->u_regs[UREG_I7],
+	       (void *)regs->u_regs[UREG_FP], code);
+
+	print_vma_addr(KERN_CONT " in ", regs->pc);
+
+	printk(KERN_CONT "\n");
+}
+
+static void __do_fault_siginfo(int code, int sig, struct pt_regs *regs,
+			       unsigned long addr)
+{
+	siginfo_t info;
+
+	info.si_signo = sig;
+	info.si_code = code;
+	info.si_errno = 0;
+	info.si_addr = (void __user *) addr;
+	info.si_trapno = 0;
+
+	if (unlikely(show_unhandled_signals))
+		show_signal_msg(regs, sig, info.si_code,
+				addr, current);
+
+	force_sig_info (sig, &info, current);
+}
+
+extern unsigned long safe_compute_effective_address(struct pt_regs *,
+						    unsigned int);
+
+static unsigned long compute_si_addr(struct pt_regs *regs, int text_fault)
+{
+	unsigned int insn;
+
+	if (text_fault)
+		return regs->pc;
+
+	if (regs->psr & PSR_PS) {
+		insn = *(unsigned int *) regs->pc;
+	} else {
+		__get_user(insn, (unsigned int *) regs->pc);
+	}
+
+	return safe_compute_effective_address(regs, insn);
+}
+
+static noinline void do_fault_siginfo(int code, int sig, struct pt_regs *regs,
+				      int text_fault)
+{
+	unsigned long addr = compute_si_addr(regs, text_fault);
+
+	__do_fault_siginfo(code, sig, regs, addr);
+}
+
+asmlinkage void do_sparc_fault(struct pt_regs *regs, int text_fault, int write,
+			       unsigned long address)
+{
+	struct vm_area_struct *vma;
+	struct task_struct *tsk = current;
+	struct mm_struct *mm = tsk->mm;
+	unsigned int fixup;
+	unsigned long g2;
+	int from_user = !(regs->psr & PSR_PS);
+	int fault, code;
+	unsigned int flags = (FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE |
+			      (write ? FAULT_FLAG_WRITE : 0));
+
+	if(text_fault)
+		address = regs->pc;
+
+	/*
+	 * We fault-in kernel-space virtual memory on-demand. The
+	 * 'reference' page table is init_mm.pgd.
+	 *
+	 * NOTE! We MUST NOT take any locks for this case. We may
+	 * be in an interrupt or a critical region, and should
+	 * only copy the information from the master page table,
+	 * nothing more.
+	 */
+	code = SEGV_MAPERR;
+	if (!ARCH_SUN4C && address >= TASK_SIZE)
+		goto vmalloc_fault;
+
+	/*
+	 * If we're in an interrupt or have no user
+	 * context, we must not take the fault..
+	 */
+        if (in_atomic() || !mm)
+                goto no_context;
+
+	perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
+
+retry:
+	down_read(&mm->mmap_sem);
+
+	/*
+	 * The kernel referencing a bad kernel pointer can lock up
+	 * a sun4c machine completely, so we must attempt recovery.
+	 */
+	if(!from_user && address >= PAGE_OFFSET)
+		goto bad_area;
+
+	vma = find_vma(mm, address);
+	if(!vma)
+		goto bad_area;
+	if(vma->vm_start <= address)
+		goto good_area;
+	if(!(vma->vm_flags & VM_GROWSDOWN))
+		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:
+	code = SEGV_ACCERR;
+	if(write) {
+		if(!(vma->vm_flags & VM_WRITE))
+			goto bad_area;
+	} else {
+		/* Allow reads even for write-only mappings */
+		if(!(vma->vm_flags & (VM_READ | VM_EXEC)))
+			goto bad_area;
+	}
+
+	/*
+	 * If for any reason at all we couldn't handle the fault,
+	 * make sure we exit gracefully rather than endlessly redo
+	 * the fault.
+	 */
+	fault = handle_mm_fault(mm, vma, address, flags);
+
+	if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current))
+		return;
+
+	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 (flags & FAULT_FLAG_ALLOW_RETRY) {
+		if (fault & VM_FAULT_MAJOR) {
+			current->maj_flt++;
+			perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ,
+				      1, regs, address);
+		} else {
+			current->min_flt++;
+			perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN,
+				      1, regs, address);
+		}
+		if (fault & VM_FAULT_RETRY) {
+			flags &= ~FAULT_FLAG_ALLOW_RETRY;
+
+			/* No need to up_read(&mm->mmap_sem) as we would
+			 * have already released it in __lock_page_or_retry
+			 * in mm/filemap.c.
+			 */
+
+			goto retry;
+		}
+	}
+
+	up_read(&mm->mmap_sem);
+	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:
+	up_read(&mm->mmap_sem);
+
+bad_area_nosemaphore:
+	/* User mode accesses just cause a SIGSEGV */
+	if (from_user) {
+		do_fault_siginfo(code, SIGSEGV, regs, text_fault);
+		return;
+	}
+
+	/* Is this in ex_table? */
+no_context:
+	g2 = regs->u_regs[UREG_G2];
+	if (!from_user) {
+		fixup = search_extables_range(regs->pc, &g2);
+		if (fixup > 10) { /* Values below are reserved for other things */
+			extern const unsigned __memset_start[];
+			extern const unsigned __memset_end[];
+			extern const unsigned __csum_partial_copy_start[];
+			extern const unsigned __csum_partial_copy_end[];
+
+#ifdef DEBUG_EXCEPTIONS
+			printk("Exception: PC<%08lx> faddr<%08lx>\n", regs->pc, address);
+			printk("EX_TABLE: insn<%08lx> fixup<%08x> g2<%08lx>\n",
+				regs->pc, fixup, g2);
+#endif
+			if ((regs->pc >= (unsigned long)__memset_start &&
+			     regs->pc < (unsigned long)__memset_end) ||
+			    (regs->pc >= (unsigned long)__csum_partial_copy_start &&
+			     regs->pc < (unsigned long)__csum_partial_copy_end)) {
+			        regs->u_regs[UREG_I4] = address;
+				regs->u_regs[UREG_I5] = regs->pc;
+			}
+			regs->u_regs[UREG_G2] = g2;
+			regs->pc = fixup;
+			regs->npc = regs->pc + 4;
+			return;
+		}
+	}
+	
+	unhandled_fault (address, tsk, regs);
+	do_exit(SIGKILL);
+
+/*
+ * 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:
+	up_read(&mm->mmap_sem);
+	if (from_user) {
+		pagefault_out_of_memory();
+		return;
+	}
+	goto no_context;
+
+do_sigbus:
+	up_read(&mm->mmap_sem);
+	do_fault_siginfo(BUS_ADRERR, SIGBUS, regs, text_fault);
+	if (!from_user)
+		goto no_context;
+
+vmalloc_fault:
+	{
+		/*
+		 * Synchronize this task's top level page-table
+		 * with the 'reference' page table.
+		 */
+		int offset = pgd_index(address);
+		pgd_t *pgd, *pgd_k;
+		pmd_t *pmd, *pmd_k;
+
+		pgd = tsk->active_mm->pgd + offset;
+		pgd_k = init_mm.pgd + offset;
+
+		if (!pgd_present(*pgd)) {
+			if (!pgd_present(*pgd_k))
+				goto bad_area_nosemaphore;
+			pgd_val(*pgd) = pgd_val(*pgd_k);
+			return;
+		}
+
+		pmd = pmd_offset(pgd, address);
+		pmd_k = pmd_offset(pgd_k, address);
+
+		if (pmd_present(*pmd) || !pmd_present(*pmd_k))
+			goto bad_area_nosemaphore;
+		*pmd = *pmd_k;
+		return;
+	}
+}
+
+asmlinkage void do_sun4c_fault(struct pt_regs *regs, int text_fault, int write,
+			       unsigned long address)
+{
+	extern void sun4c_update_mmu_cache(struct vm_area_struct *,
+					   unsigned long,pte_t *);
+	extern pte_t *sun4c_pte_offset_kernel(pmd_t *,unsigned long);
+	struct task_struct *tsk = current;
+	struct mm_struct *mm = tsk->mm;
+	pgd_t *pgdp;
+	pte_t *ptep;
+
+	if (text_fault) {
+		address = regs->pc;
+	} else if (!write &&
+		   !(regs->psr & PSR_PS)) {
+		unsigned int insn, __user *ip;
+
+		ip = (unsigned int __user *)regs->pc;
+		if (!get_user(insn, ip)) {
+			if ((insn & 0xc1680000) == 0xc0680000)
+				write = 1;
+		}
+	}
+
+	if (!mm) {
+		/* We are oopsing. */
+		do_sparc_fault(regs, text_fault, write, address);
+		BUG();	/* P3 Oops already, you bitch */
+	}
+
+	pgdp = pgd_offset(mm, address);
+	ptep = sun4c_pte_offset_kernel((pmd_t *) pgdp, address);
+
+	if (pgd_val(*pgdp)) {
+	    if (write) {
+		if ((pte_val(*ptep) & (_SUN4C_PAGE_WRITE|_SUN4C_PAGE_PRESENT))
+				   == (_SUN4C_PAGE_WRITE|_SUN4C_PAGE_PRESENT)) {
+			unsigned long flags;
+
+			*ptep = __pte(pte_val(*ptep) | _SUN4C_PAGE_ACCESSED |
+				      _SUN4C_PAGE_MODIFIED |
+				      _SUN4C_PAGE_VALID |
+				      _SUN4C_PAGE_DIRTY);
+
+			local_irq_save(flags);
+			if (sun4c_get_segmap(address) != invalid_segment) {
+				sun4c_put_pte(address, pte_val(*ptep));
+				local_irq_restore(flags);
+				return;
+			}
+			local_irq_restore(flags);
+		}
+	    } else {
+		if ((pte_val(*ptep) & (_SUN4C_PAGE_READ|_SUN4C_PAGE_PRESENT))
+				   == (_SUN4C_PAGE_READ|_SUN4C_PAGE_PRESENT)) {
+			unsigned long flags;
+
+			*ptep = __pte(pte_val(*ptep) | _SUN4C_PAGE_ACCESSED |
+				      _SUN4C_PAGE_VALID);
+
+			local_irq_save(flags);
+			if (sun4c_get_segmap(address) != invalid_segment) {
+				sun4c_put_pte(address, pte_val(*ptep));
+				local_irq_restore(flags);
+				return;
+			}
+			local_irq_restore(flags);
+		}
+	    }
+	}
+
+	/* This conditional is 'interesting'. */
+	if (pgd_val(*pgdp) && !(write && !(pte_val(*ptep) & _SUN4C_PAGE_WRITE))
+	    && (pte_val(*ptep) & _SUN4C_PAGE_VALID))
+		/* Note: It is safe to not grab the MMAP semaphore here because
+		 *       we know that update_mmu_cache() will not sleep for
+		 *       any reason (at least not in the current implementation)
+		 *       and therefore there is no danger of another thread getting
+		 *       on the CPU and doing a shrink_mmap() on this vma.
+		 */
+		sun4c_update_mmu_cache (find_vma(current->mm, address), address,
+					ptep);
+	else
+		do_sparc_fault(regs, text_fault, write, address);
+}
+
+/* This always deals with user addresses. */
+static void force_user_fault(unsigned long address, int write)
+{
+	struct vm_area_struct *vma;
+	struct task_struct *tsk = current;
+	struct mm_struct *mm = tsk->mm;
+	int code;
+
+	code = SEGV_MAPERR;
+
+	down_read(&mm->mmap_sem);
+	vma = find_vma(mm, address);
+	if(!vma)
+		goto bad_area;
+	if(vma->vm_start <= address)
+		goto good_area;
+	if(!(vma->vm_flags & VM_GROWSDOWN))
+		goto bad_area;
+	if(expand_stack(vma, address))
+		goto bad_area;
+good_area:
+	code = SEGV_ACCERR;
+	if(write) {
+		if(!(vma->vm_flags & VM_WRITE))
+			goto bad_area;
+	} else {
+		if(!(vma->vm_flags & (VM_READ | VM_EXEC)))
+			goto bad_area;
+	}
+	switch (handle_mm_fault(mm, vma, address, write ? FAULT_FLAG_WRITE : 0)) {
+	case VM_FAULT_SIGBUS:
+	case VM_FAULT_OOM:
+		goto do_sigbus;
+	}
+	up_read(&mm->mmap_sem);
+	return;
+bad_area:
+	up_read(&mm->mmap_sem);
+	__do_fault_siginfo(code, SIGSEGV, tsk->thread.kregs, address);
+	return;
+
+do_sigbus:
+	up_read(&mm->mmap_sem);
+	__do_fault_siginfo(BUS_ADRERR, SIGBUS, tsk->thread.kregs, address);
+}
+
+static void check_stack_aligned(unsigned long sp)
+{
+	if (sp & 0x7UL)
+		force_sig(SIGILL, current);
+}
+
+void window_overflow_fault(void)
+{
+	unsigned long sp;
+
+	sp = current_thread_info()->rwbuf_stkptrs[0];
+	if(((sp + 0x38) & PAGE_MASK) != (sp & PAGE_MASK))
+		force_user_fault(sp + 0x38, 1);
+	force_user_fault(sp, 1);
+
+	check_stack_aligned(sp);
+}
+
+void window_underflow_fault(unsigned long sp)
+{
+	if(((sp + 0x38) & PAGE_MASK) != (sp & PAGE_MASK))
+		force_user_fault(sp + 0x38, 0);
+	force_user_fault(sp, 0);
+
+	check_stack_aligned(sp);
+}
+
+void window_ret_fault(struct pt_regs *regs)
+{
+	unsigned long sp;
+
+	sp = regs->u_regs[UREG_FP];
+	if(((sp + 0x38) & PAGE_MASK) != (sp & PAGE_MASK))
+		force_user_fault(sp + 0x38, 0);
+	force_user_fault(sp, 0);
+
+	check_stack_aligned(sp);
+}