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https://github.com/adulau/aha.git
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[PATCH] CRIS update: mm
Memory management patches. * SMP support. * Non-executable stack (on v32). * 4-level page tables. * Added simple Thread Local Storage support. Signed-off-by: Mikael Starvik <starvik@axis.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Mikael Starvik
Linus Torvalds
parent
7cf32cad15
commit
4f18cfbf09
4 changed files with 135 additions and 48 deletions
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@ -6,6 +6,38 @@
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* Authors: Bjorn Wesen
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*
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* $Log: fault.c,v $
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* Revision 1.20 2005/03/04 08:16:18 starvik
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* Merge of Linux 2.6.11.
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*
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* Revision 1.19 2005/01/14 10:07:59 starvik
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* Fixed warning.
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*
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* Revision 1.18 2005/01/12 08:10:14 starvik
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* Readded the change of frametype when handling kernel page fault fixup
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* for v10. This is necessary to avoid that the CPU remakes the faulting
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* access.
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*
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* Revision 1.17 2005/01/11 13:53:05 starvik
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* Use raw_printk.
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*
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* Revision 1.16 2004/12/17 11:39:41 starvik
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* SMP support.
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*
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* Revision 1.15 2004/11/23 18:36:18 starvik
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* Stack is now non-executable.
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* Signal handler trampolines are placed in a reserved page mapped into all
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* processes.
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*
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* Revision 1.14 2004/11/23 07:10:21 starvik
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* Moved find_fixup_code to generic code.
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*
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* Revision 1.13 2004/11/23 07:00:54 starvik
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* Actually use the execute permission bit in the MMU. This makes it possible
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* to prevent e.g. attacks where executable code is put on the stack.
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*
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* Revision 1.12 2004/09/29 06:16:04 starvik
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* Use instruction_pointer
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*
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* Revision 1.11 2004/05/14 07:58:05 starvik
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* Merge of changes from 2.4
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*
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@ -103,6 +135,7 @@
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extern int find_fixup_code(struct pt_regs *);
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extern void die_if_kernel(const char *, struct pt_regs *, long);
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extern int raw_printk(const char *fmt, ...);
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/* debug of low-level TLB reload */
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#undef DEBUG
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@ -118,7 +151,8 @@ extern void die_if_kernel(const char *, struct pt_regs *, long);
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/* current active page directory */
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volatile pgd_t *current_pgd;
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volatile DEFINE_PER_CPU(pgd_t *,current_pgd);
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unsigned long cris_signal_return_page;
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/*
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* This routine handles page faults. It determines the address,
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@ -146,8 +180,9 @@ do_page_fault(unsigned long address, struct pt_regs *regs,
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struct vm_area_struct * vma;
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siginfo_t info;
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D(printk("Page fault for %X at %X, prot %d write %d\n",
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address, regs->erp, protection, writeaccess));
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D(printk("Page fault for %lX on %X at %lX, prot %d write %d\n",
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address, smp_processor_id(), instruction_pointer(regs),
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protection, writeaccess));
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tsk = current;
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@ -175,8 +210,19 @@ do_page_fault(unsigned long address, struct pt_regs *regs,
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!user_mode(regs))
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goto vmalloc_fault;
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/* When stack execution is not allowed we store the signal
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* trampolines in the reserved cris_signal_return_page.
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* Handle this in the exact same way as vmalloc (we know
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* that the mapping is there and is valid so no need to
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* call handle_mm_fault).
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*/
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if (cris_signal_return_page &&
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address == cris_signal_return_page &&
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!protection && user_mode(regs))
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goto vmalloc_fault;
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/* we can and should enable interrupts at this point */
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sti();
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local_irq_enable();
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mm = tsk->mm;
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info.si_code = SEGV_MAPERR;
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@ -220,7 +266,10 @@ do_page_fault(unsigned long address, struct pt_regs *regs,
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/* first do some preliminary protection checks */
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if (writeaccess) {
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if (writeaccess == 2){
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if (!(vma->vm_flags & VM_EXEC))
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goto bad_area;
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} else if (writeaccess == 1) {
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if (!(vma->vm_flags & VM_WRITE))
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goto bad_area;
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} else {
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@ -234,7 +283,7 @@ do_page_fault(unsigned long address, struct pt_regs *regs,
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* the fault.
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*/
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switch (handle_mm_fault(mm, vma, address, writeaccess)) {
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switch (handle_mm_fault(mm, vma, address, writeaccess & 1)) {
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case 1:
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tsk->min_flt++;
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break;
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@ -292,10 +341,10 @@ do_page_fault(unsigned long address, struct pt_regs *regs,
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*/
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if ((unsigned long) (address) < PAGE_SIZE)
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printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
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raw_printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
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else
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printk(KERN_ALERT "Unable to handle kernel access");
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printk(" at virtual address %08lx\n",address);
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raw_printk(KERN_ALERT "Unable to handle kernel access");
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raw_printk(" at virtual address %08lx\n",address);
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die_if_kernel("Oops", regs, (writeaccess << 1) | protection);
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@ -346,10 +395,11 @@ vmalloc_fault:
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int offset = pgd_index(address);
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pgd_t *pgd, *pgd_k;
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pud_t *pud, *pud_k;
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pmd_t *pmd, *pmd_k;
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pte_t *pte_k;
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pgd = (pgd_t *)current_pgd + offset;
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pgd = (pgd_t *)per_cpu(current_pgd, smp_processor_id()) + offset;
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pgd_k = init_mm.pgd + offset;
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/* Since we're two-level, we don't need to do both
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@ -364,8 +414,13 @@ vmalloc_fault:
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* it exists.
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*/
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pmd = pmd_offset(pgd, address);
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pmd_k = pmd_offset(pgd_k, address);
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pud = pud_offset(pgd, address);
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pud_k = pud_offset(pgd_k, address);
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if (!pud_present(*pud_k))
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goto no_context;
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pmd = pmd_offset(pud, address);
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pmd_k = pmd_offset(pud_k, address);
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if (!pmd_present(*pmd_k))
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goto bad_area_nosemaphore;
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@ -385,3 +440,19 @@ vmalloc_fault:
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return;
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}
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}
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/* Find fixup code. */
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int
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find_fixup_code(struct pt_regs *regs)
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{
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const struct exception_table_entry *fixup;
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if ((fixup = search_exception_tables(instruction_pointer(regs))) != 0) {
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/* Adjust the instruction pointer in the stackframe. */
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instruction_pointer(regs) = fixup->fixup;
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arch_fixup(regs);
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return 1;
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}
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return 0;
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}
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@ -14,9 +14,10 @@
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#include <asm/pgalloc.h>
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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#include <asm/arch/memmap.h>
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extern inline void remap_area_pte(pte_t * pte, unsigned long address, unsigned long size,
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unsigned long phys_addr, unsigned long flags)
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unsigned long phys_addr, pgprot_t prot)
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{
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unsigned long end;
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@ -31,9 +32,7 @@ extern inline void remap_area_pte(pte_t * pte, unsigned long address, unsigned l
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printk("remap_area_pte: page already exists\n");
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BUG();
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}
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set_pte(pte, mk_pte_phys(phys_addr, __pgprot(_PAGE_PRESENT | __READABLE |
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__WRITEABLE | _PAGE_GLOBAL |
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_PAGE_KERNEL | flags)));
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set_pte(pte, mk_pte_phys(phys_addr, prot));
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address += PAGE_SIZE;
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phys_addr += PAGE_SIZE;
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pte++;
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@ -41,7 +40,7 @@ extern inline void remap_area_pte(pte_t * pte, unsigned long address, unsigned l
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}
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static inline int remap_area_pmd(pmd_t * pmd, unsigned long address, unsigned long size,
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unsigned long phys_addr, unsigned long flags)
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unsigned long phys_addr, pgprot_t prot)
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{
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unsigned long end;
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@ -56,7 +55,7 @@ static inline int remap_area_pmd(pmd_t * pmd, unsigned long address, unsigned lo
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pte_t * pte = pte_alloc_kernel(&init_mm, pmd, address);
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if (!pte)
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return -ENOMEM;
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remap_area_pte(pte, address, end - address, address + phys_addr, flags);
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remap_area_pte(pte, address, end - address, address + phys_addr, prot);
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address = (address + PMD_SIZE) & PMD_MASK;
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pmd++;
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} while (address && (address < end));
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@ -64,7 +63,7 @@ static inline int remap_area_pmd(pmd_t * pmd, unsigned long address, unsigned lo
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}
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static int remap_area_pages(unsigned long address, unsigned long phys_addr,
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unsigned long size, unsigned long flags)
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unsigned long size, pgprot_t prot)
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{
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int error;
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pgd_t * dir;
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@ -77,13 +76,19 @@ static int remap_area_pages(unsigned long address, unsigned long phys_addr,
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BUG();
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spin_lock(&init_mm.page_table_lock);
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do {
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pud_t *pud;
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pmd_t *pmd;
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pmd = pmd_alloc(&init_mm, dir, address);
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error = -ENOMEM;
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pud = pud_alloc(&init_mm, dir, address);
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if (!pud)
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break;
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pmd = pmd_alloc(&init_mm, pud, address);
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if (!pmd)
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break;
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if (remap_area_pmd(pmd, address, end - address,
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phys_addr + address, flags))
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phys_addr + address, prot))
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break;
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error = 0;
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address = (address + PGDIR_SIZE) & PGDIR_MASK;
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@ -107,9 +112,9 @@ static int remap_area_pages(unsigned long address, unsigned long phys_addr,
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* have to convert them into an offset in a page-aligned mapping, but the
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* caller shouldn't need to know that small detail.
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*/
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void * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags)
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void __iomem * __ioremap_prot(unsigned long phys_addr, unsigned long size, pgprot_t prot)
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{
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void * addr;
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void __iomem * addr;
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struct vm_struct * area;
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unsigned long offset, last_addr;
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@ -131,15 +136,36 @@ void * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flag
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area = get_vm_area(size, VM_IOREMAP);
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if (!area)
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return NULL;
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addr = area->addr;
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if (remap_area_pages((unsigned long) addr, phys_addr, size, flags)) {
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vfree(addr);
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addr = (void __iomem *)area->addr;
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if (remap_area_pages((unsigned long) addr, phys_addr, size, prot)) {
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vfree((void __force *)addr);
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return NULL;
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}
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return (void *) (offset + (char *)addr);
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return (void __iomem *) (offset + (char __iomem *)addr);
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}
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void iounmap(void *addr)
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void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags)
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{
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return __ioremap_prot(phys_addr, size,
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__pgprot(_PAGE_PRESENT | __READABLE |
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__WRITEABLE | _PAGE_GLOBAL |
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_PAGE_KERNEL | flags));
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}
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/**
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* ioremap_nocache - map bus memory into CPU space
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* @offset: bus address of the memory
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* @size: size of the resource to map
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*
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* Must be freed with iounmap.
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*/
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void __iomem *ioremap_nocache (unsigned long phys_addr, unsigned long size)
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{
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return __ioremap(phys_addr | MEM_NON_CACHEABLE, size, 0);
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}
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void iounmap(volatile void __iomem *addr)
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{
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if (addr > high_memory)
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return vfree((void *) (PAGE_MASK & (unsigned long) addr));
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@ -29,18 +29,6 @@
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struct mm_struct *page_id_map[NUM_PAGEID];
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static int map_replace_ptr = 1; /* which page_id_map entry to replace next */
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/*
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* Initialize the context related info for a new mm_struct
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* instance.
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*/
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int
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init_new_context(struct task_struct *tsk, struct mm_struct *mm)
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{
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mm->context = NO_CONTEXT;
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return 0;
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}
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/* the following functions are similar to those used in the PPC port */
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static inline void
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@ -60,12 +48,12 @@ alloc_context(struct mm_struct *mm)
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*/
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flush_tlb_mm(old_mm);
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old_mm->context = NO_CONTEXT;
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old_mm->context.page_id = NO_CONTEXT;
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}
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/* insert it into the page_id_map */
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mm->context = map_replace_ptr;
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mm->context.page_id = map_replace_ptr;
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page_id_map[map_replace_ptr] = mm;
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map_replace_ptr++;
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@ -81,7 +69,7 @@ alloc_context(struct mm_struct *mm)
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void
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get_mmu_context(struct mm_struct *mm)
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{
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if(mm->context == NO_CONTEXT)
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if(mm->context.page_id == NO_CONTEXT)
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alloc_context(mm);
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}
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@ -96,11 +84,10 @@ get_mmu_context(struct mm_struct *mm)
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void
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destroy_context(struct mm_struct *mm)
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{
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if(mm->context != NO_CONTEXT) {
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D(printk("destroy_context %d (%p)\n", mm->context, mm));
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if(mm->context.page_id != NO_CONTEXT) {
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D(printk("destroy_context %d (%p)\n", mm->context.page_id, mm));
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flush_tlb_mm(mm); /* TODO this might be redundant ? */
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page_id_map[mm->context] = NULL;
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/* mm->context = NO_CONTEXT; redundant.. mm will be freed */
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page_id_map[mm->context.page_id] = NULL;
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}
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}
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@ -7,7 +7,10 @@
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/* type used in struct mm to couple an MMU context to an active mm */
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typedef unsigned int mm_context_t;
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typedef struct
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{
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unsigned int page_id;
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} mm_context_t;
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/* kernel memory segments */
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