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authorSam Ravnborg <sam@ravnborg.org>2008-11-16 20:08:19 -0800
committerDavid S. Miller <davem@davemloft.net>2008-12-04 09:16:58 -0800
commitc37ddd936d96b46cf2bb17e7b1a18b2bd24ec1fb (patch)
treedff3bc2e890a4c1aa12bbce851be9eea4caa007f /arch/sparc/mm/fault.c
parent7c979c49c9882badee45c0a7a3dbca1040b7ba73 (diff)
sparc: prepare mm/ for unification
- rename files where sparc64 has similar files to _32.c - Restructure Makefile - Sneak in -Werror as we have for sparc64 Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/mm/fault.c')
-rw-r--r--arch/sparc/mm/fault.c543
1 files changed, 0 insertions, 543 deletions
diff --git a/arch/sparc/mm/fault.c b/arch/sparc/mm/fault.c
deleted file mode 100644
index a507e1174662..000000000000
--- a/arch/sparc/mm/fault.c
+++ /dev/null
@@ -1,543 +0,0 @@
-/*
- * 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/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/smp.h>
-#include <asm/traps.h>
-#include <asm/uaccess.h>
-
-extern int prom_node_root;
-
-/* 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;
-}
-
-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);
-}
-
-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;
- siginfo_t info;
- int from_user = !(regs->psr & PSR_PS);
- int fault;
-
- 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.
- */
- if (!ARCH_SUN4C && address >= TASK_SIZE)
- goto vmalloc_fault;
-
- info.si_code = SEGV_MAPERR;
-
- /*
- * If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
- if (in_atomic() || !mm)
- goto no_context;
-
- 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:
- info.si_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, 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);
- 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) {
-#if 0
- printk("Fault whee %s [%d]: segfaults at %08lx pc=%08lx\n",
- tsk->comm, tsk->pid, address, regs->pc);
-#endif
- info.si_signo = SIGSEGV;
- info.si_errno = 0;
- /* info.si_code set above to make clear whether
- this was a SEGV_MAPERR or SEGV_ACCERR fault. */
- info.si_addr = (void __user *)compute_si_addr(regs, text_fault);
- info.si_trapno = 0;
- force_sig_info (SIGSEGV, &info, tsk);
- 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);
- printk("VM: killing process %s\n", tsk->comm);
- if (from_user)
- do_group_exit(SIGKILL);
- goto no_context;
-
-do_sigbus:
- up_read(&mm->mmap_sem);
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_ADRERR;
- info.si_addr = (void __user *) compute_si_addr(regs, text_fault);
- info.si_trapno = 0;
- force_sig_info (SIGBUS, &info, tsk);
- 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;
- siginfo_t info;
-
- info.si_code = SEGV_MAPERR;
-
-#if 0
- printk("wf<pid=%d,wr=%d,addr=%08lx>\n",
- tsk->pid, write, address);
-#endif
- 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:
- info.si_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)) {
- case VM_FAULT_SIGBUS:
- case VM_FAULT_OOM:
- goto do_sigbus;
- }
- up_read(&mm->mmap_sem);
- return;
-bad_area:
- up_read(&mm->mmap_sem);
-#if 0
- printk("Window whee %s [%d]: segfaults at %08lx\n",
- tsk->comm, tsk->pid, address);
-#endif
- info.si_signo = SIGSEGV;
- info.si_errno = 0;
- /* info.si_code set above to make clear whether
- this was a SEGV_MAPERR or SEGV_ACCERR fault. */
- info.si_addr = (void __user *) address;
- info.si_trapno = 0;
- force_sig_info (SIGSEGV, &info, tsk);
- return;
-
-do_sigbus:
- up_read(&mm->mmap_sem);
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_ADRERR;
- info.si_addr = (void __user *) address;
- info.si_trapno = 0;
- force_sig_info (SIGBUS, &info, tsk);
-}
-
-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);
-}
-
-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);
-}
-
-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);
-}