1 files changed, 87 insertions, 200 deletions

diff --git a/arch/sparc/mm/fault_32.c b/arch/sparc/mm/fault_32.c
index 5b836f5aea9..908e8c17c90 100644
--- a/arch/sparc/mm/fault_32.c
+++ b/arch/sparc/mm/fault_32.c
@@ -20,97 +20,48 @@
 #include <linux/smp.h>
 #include <linux/perf_event.h>
 #include <linux/interrupt.h>
-#include <linux/module.h>
 #include <linux/kdebug.h>
 
-#include <asm/system.h>
 #include <asm/page.h>
 #include <asm/pgtable.h>
-#include <asm/memreg.h>
 #include <asm/openprom.h>
 #include <asm/oplib.h>
+#include <asm/setup.h>
 #include <asm/smp.h>
 #include <asm/traps.h>
 #include <asm/uaccess.h>
 
-extern int prom_node_root;
+#include "mm_32.h"
 
 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)
+static void __noreturn unhandled_fault(unsigned long address,
+				       struct task_struct *tsk,
+				       struct pt_regs *regs)
 {
-	if((unsigned long) address < PAGE_SIZE) {
+	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 "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));
+			(unsigned long) tsk->active_mm->pgd));
 	die_if_kernel("Oops", regs);
 }
 
-asmlinkage int lookup_fault(unsigned long pc, unsigned long ret_pc, 
+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:
@@ -130,14 +81,14 @@ asmlinkage int lookup_fault(unsigned long pc, unsigned long ret_pc,
 		/* for _from_ macros */
 		insn = *((unsigned int *) pc);
 		if (!((insn >> 21) & 1) || ((insn>>19)&0x3f) == 15)
-			return 2; 
-		break; 
+			return 2;
+		break;
 
 	default:
 		break;
-	};
+	}
 
-	memset(&regs, 0, sizeof (regs));
+	memset(&regs, 0, sizeof(regs));
 	regs.pc = pc;
 	regs.npc = pc + 4;
 	__asm__ __volatile__(
@@ -190,9 +141,6 @@ static void __do_fault_siginfo(int code, int sig, struct pt_regs *regs,
 	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;
@@ -200,11 +148,10 @@ static unsigned long compute_si_addr(struct pt_regs *regs, int text_fault)
 	if (text_fault)
 		return regs->pc;
 
-	if (regs->psr & PSR_PS) {
+	if (regs->psr & PSR_PS)
 		insn = *(unsigned int *) regs->pc;
-	} else {
+	else
 		__get_user(insn, (unsigned int *) regs->pc);
-	}
 
 	return safe_compute_effective_address(regs, insn);
 }
@@ -227,8 +174,9 @@ asmlinkage void do_sparc_fault(struct pt_regs *regs, int text_fault, int write,
 	unsigned long g2;
 	int from_user = !(regs->psr & PSR_PS);
 	int fault, code;
+	unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE;
 
-	if(text_fault)
+	if (text_fault)
 		address = regs->pc;
 
 	/*
@@ -240,37 +188,33 @@ asmlinkage void do_sparc_fault(struct pt_regs *regs, int text_fault, int write,
 	 * only copy the information from the master page table,
 	 * nothing more.
 	 */
-	if (!ARCH_SUN4C && address >= TASK_SIZE)
-		goto vmalloc_fault;
-
 	code = SEGV_MAPERR;
+	if (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;
+	if (in_atomic() || !mm)
+		goto no_context;
 
-	perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, 0, regs, address);
+	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)
+	if (!from_user && address >= PAGE_OFFSET)
 		goto bad_area;
 
 	vma = find_vma(mm, address);
-	if(!vma)
+	if (!vma)
 		goto bad_area;
-	if(vma->vm_start <= address)
+	if (vma->vm_start <= address)
 		goto good_area;
-	if(!(vma->vm_flags & VM_GROWSDOWN))
+	if (!(vma->vm_flags & VM_GROWSDOWN))
 		goto bad_area;
-	if(expand_stack(vma, address))
+	if (expand_stack(vma, address))
 		goto bad_area;
 	/*
 	 * Ok, we have a good vm_area for this memory access, so
@@ -278,21 +222,30 @@ asmlinkage void do_sparc_fault(struct pt_regs *regs, int text_fault, int write,
 	 */
 good_area:
 	code = SEGV_ACCERR;
-	if(write) {
-		if(!(vma->vm_flags & VM_WRITE))
+	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)))
+		if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
 			goto bad_area;
 	}
 
+	if (from_user)
+		flags |= FAULT_FLAG_USER;
+	if (write)
+		flags |= FAULT_FLAG_WRITE;
+
 	/*
 	 * 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, write ? FAULT_FLAG_WRITE : 0);
+	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;
@@ -300,15 +253,30 @@ good_area:
 			goto do_sigbus;
 		BUG();
 	}
-	if (fault & VM_FAULT_MAJOR) {
-		current->maj_flt++;
-		perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, 0,
-			      regs, address);
-	} else {
-		current->min_flt++;
-		perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, 0,
-			      regs, address);
+
+	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;
+			flags |= FAULT_FLAG_TRIED;
+
+			/* 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;
 
@@ -331,14 +299,16 @@ 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 */
+		/* Values below 10 are reserved for other things */
+		if (fixup > 10) {
 			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("Exception: PC<%08lx> faddr<%08lx>\n",
+			       regs->pc, address);
 			printk("EX_TABLE: insn<%08lx> fixup<%08x> g2<%08lx>\n",
 				regs->pc, fixup, g2);
 #endif
@@ -346,7 +316,7 @@ no_context:
 			     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_I4] = address;
 				regs->u_regs[UREG_I5] = regs->pc;
 			}
 			regs->u_regs[UREG_G2] = g2;
@@ -355,8 +325,8 @@ no_context:
 			return;
 		}
 	}
-	
-	unhandled_fault (address, tsk, regs);
+
+	unhandled_fault(address, tsk, regs);
 	do_exit(SIGKILL);
 
 /*
@@ -402,127 +372,44 @@ vmalloc_fault:
 
 		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;
+	unsigned int flags = FAULT_FLAG_USER;
 	int code;
 
 	code = SEGV_MAPERR;
 
 	down_read(&mm->mmap_sem);
 	vma = find_vma(mm, address);
-	if(!vma)
+	if (!vma)
 		goto bad_area;
-	if(vma->vm_start <= address)
+	if (vma->vm_start <= address)
 		goto good_area;
-	if(!(vma->vm_flags & VM_GROWSDOWN))
+	if (!(vma->vm_flags & VM_GROWSDOWN))
 		goto bad_area;
-	if(expand_stack(vma, address))
+	if (expand_stack(vma, address))
 		goto bad_area;
 good_area:
 	code = SEGV_ACCERR;
-	if(write) {
-		if(!(vma->vm_flags & VM_WRITE))
+	if (write) {
+		if (!(vma->vm_flags & VM_WRITE))
 			goto bad_area;
+		flags |= FAULT_FLAG_WRITE;
 	} else {
-		if(!(vma->vm_flags & (VM_READ | VM_EXEC)))
+		if (!(vma->vm_flags & (VM_READ | VM_EXEC)))
 			goto bad_area;
 	}
-	switch (handle_mm_fault(mm, vma, address, write ? FAULT_FLAG_WRITE : 0)) {
+	switch (handle_mm_fault(mm, vma, address, flags)) {
 	case VM_FAULT_SIGBUS:
 	case VM_FAULT_OOM:
 		goto do_sigbus;
@@ -550,7 +437,7 @@ void window_overflow_fault(void)
 	unsigned long sp;
 
 	sp = current_thread_info()->rwbuf_stkptrs[0];
-	if(((sp + 0x38) & PAGE_MASK) != (sp & PAGE_MASK))
+	if (((sp + 0x38) & PAGE_MASK) != (sp & PAGE_MASK))
 		force_user_fault(sp + 0x38, 1);
 	force_user_fault(sp, 1);
 
@@ -559,7 +446,7 @@ void window_overflow_fault(void)
 
 void window_underflow_fault(unsigned long sp)
 {
-	if(((sp + 0x38) & PAGE_MASK) != (sp & PAGE_MASK))
+	if (((sp + 0x38) & PAGE_MASK) != (sp & PAGE_MASK))
 		force_user_fault(sp + 0x38, 0);
 	force_user_fault(sp, 0);
 
@@ -571,7 +458,7 @@ 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))
+	if (((sp + 0x38) & PAGE_MASK) != (sp & PAGE_MASK))
 		force_user_fault(sp + 0x38, 0);
 	force_user_fault(sp, 0);