^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * MMU fault handling support.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 1998-2002 Hewlett-Packard Co
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * David Mosberger-Tang <davidm@hpl.hp.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/sched/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/extable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/kprobes.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/kdebug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/prefetch.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/perf_event.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <asm/processor.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <asm/exception.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) extern int die(char *, struct pt_regs *, long);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * Return TRUE if ADDRESS points at a page in the kernel's mapped segment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * (inside region 5, on ia64) and that page is present.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) mapped_kernel_page_is_present (unsigned long address)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) pgd_t *pgd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) p4d_t *p4d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) pud_t *pud;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) pmd_t *pmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) pte_t *ptep, pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) pgd = pgd_offset_k(address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) if (pgd_none(*pgd) || pgd_bad(*pgd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) p4d = p4d_offset(pgd, address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) if (p4d_none(*p4d) || p4d_bad(*p4d))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) pud = pud_offset(p4d, address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) if (pud_none(*pud) || pud_bad(*pud))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) pmd = pmd_offset(pud, address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) if (pmd_none(*pmd) || pmd_bad(*pmd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) ptep = pte_offset_kernel(pmd, address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (!ptep)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) pte = *ptep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) return pte_present(pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) # define VM_READ_BIT 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) # define VM_WRITE_BIT 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) # define VM_EXEC_BIT 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) void __kprobes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) int signal = SIGSEGV, code = SEGV_MAPERR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) struct vm_area_struct *vma, *prev_vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) struct mm_struct *mm = current->mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) unsigned long mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) vm_fault_t fault;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) unsigned int flags = FAULT_FLAG_DEFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) mask = ((((isr >> IA64_ISR_X_BIT) & 1UL) << VM_EXEC_BIT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) | (((isr >> IA64_ISR_W_BIT) & 1UL) << VM_WRITE_BIT));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) /* mmap_lock is performance critical.... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) prefetchw(&mm->mmap_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * If we're in an interrupt or have no user context, we must not take the fault..
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (faulthandler_disabled() || !mm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) goto no_context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) #ifdef CONFIG_VIRTUAL_MEM_MAP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * If fault is in region 5 and we are in the kernel, we may already
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * have the mmap_lock (pfn_valid macro is called during mmap). There
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * is no vma for region 5 addr's anyway, so skip getting the semaphore
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * and go directly to the exception handling code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if ((REGION_NUMBER(address) == 5) && !user_mode(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) goto bad_area_no_up;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * This is to handle the kprobes on user space access instructions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (kprobe_page_fault(regs, TRAP_BRKPT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (user_mode(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) flags |= FAULT_FLAG_USER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) if (mask & VM_WRITE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) flags |= FAULT_FLAG_WRITE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) retry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) mmap_read_lock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) vma = find_vma_prev(mm, address, &prev_vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) if (!vma && !prev_vma )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) goto bad_area;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) * find_vma_prev() returns vma such that address < vma->vm_end or NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) * May find no vma, but could be that the last vm area is the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) * register backing store that needs to expand upwards, in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) * this case vma will be null, but prev_vma will ne non-null
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) if (( !vma && prev_vma ) || (address < vma->vm_start) )
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) goto check_expansion;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) good_area:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) code = SEGV_ACCERR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) /* OK, we've got a good vm_area for this memory area. Check the access permissions: */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) # if (((1 << VM_READ_BIT) != VM_READ || (1 << VM_WRITE_BIT) != VM_WRITE) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) || (1 << VM_EXEC_BIT) != VM_EXEC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) # error File is out of sync with <linux/mm.h>. Please update.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) # endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) if (((isr >> IA64_ISR_R_BIT) & 1UL) && (!(vma->vm_flags & (VM_READ | VM_WRITE))))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) goto bad_area;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) if ((vma->vm_flags & mask) != mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) goto bad_area;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) * If for any reason at all we couldn't handle the fault, make
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) * sure we exit gracefully rather than endlessly redo the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) * fault.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) fault = handle_mm_fault(vma, address, flags, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) if (fault_signal_pending(fault, regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) if (unlikely(fault & VM_FAULT_ERROR)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) * We ran out of memory, or some other thing happened
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) * to us that made us unable to handle the page fault
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) * gracefully.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) if (fault & VM_FAULT_OOM) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) goto out_of_memory;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) } else if (fault & VM_FAULT_SIGSEGV) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) goto bad_area;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) } else if (fault & VM_FAULT_SIGBUS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) signal = SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) goto bad_area;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) if (flags & FAULT_FLAG_ALLOW_RETRY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) if (fault & VM_FAULT_RETRY) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) flags |= FAULT_FLAG_TRIED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) /* No need to mmap_read_unlock(mm) as we would
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) * have already released it in __lock_page_or_retry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) * in mm/filemap.c.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) goto retry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) mmap_read_unlock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) check_expansion:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) if (!(prev_vma && (prev_vma->vm_flags & VM_GROWSUP) && (address == prev_vma->vm_end))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) if (!vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) goto bad_area;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) if (!(vma->vm_flags & VM_GROWSDOWN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) goto bad_area;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) if (REGION_NUMBER(address) != REGION_NUMBER(vma->vm_start)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) || REGION_OFFSET(address) >= RGN_MAP_LIMIT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) goto bad_area;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) if (expand_stack(vma, address))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) goto bad_area;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) vma = prev_vma;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) if (REGION_NUMBER(address) != REGION_NUMBER(vma->vm_start)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) || REGION_OFFSET(address) >= RGN_MAP_LIMIT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) goto bad_area;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) * Since the register backing store is accessed sequentially,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) * we disallow growing it by more than a page at a time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) if (address > vma->vm_end + PAGE_SIZE - sizeof(long))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) goto bad_area;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) if (expand_upwards(vma, address))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) goto bad_area;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) goto good_area;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) bad_area:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) mmap_read_unlock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) #ifdef CONFIG_VIRTUAL_MEM_MAP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) bad_area_no_up:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) if ((isr & IA64_ISR_SP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) || ((isr & IA64_ISR_NA) && (isr & IA64_ISR_CODE_MASK) == IA64_ISR_CODE_LFETCH))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) * This fault was due to a speculative load or lfetch.fault, set the "ed"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) * bit in the psr to ensure forward progress. (Target register will get a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) * NaT for ld.s, lfetch will be canceled.)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) ia64_psr(regs)->ed = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) if (user_mode(regs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) force_sig_fault(signal, code, (void __user *) address,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 0, __ISR_VALID, isr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) no_context:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) if ((isr & IA64_ISR_SP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) || ((isr & IA64_ISR_NA) && (isr & IA64_ISR_CODE_MASK) == IA64_ISR_CODE_LFETCH))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) * This fault was due to a speculative load or lfetch.fault, set the "ed"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) * bit in the psr to ensure forward progress. (Target register will get a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) * NaT for ld.s, lfetch will be canceled.)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) ia64_psr(regs)->ed = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) * Since we have no vma's for region 5, we might get here even if the address is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) * valid, due to the VHPT walker inserting a non present translation that becomes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) * stale. If that happens, the non present fault handler already purged the stale
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) * translation, which fixed the problem. So, we check to see if the translation is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) * valid, and return if it is.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) if (REGION_NUMBER(address) == 5 && mapped_kernel_page_is_present(address))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) if (ia64_done_with_exception(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) * Oops. The kernel tried to access some bad page. We'll have to terminate things
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) * with extreme prejudice.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) bust_spinlocks(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) if (address < PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference (address %016lx)\n", address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) printk(KERN_ALERT "Unable to handle kernel paging request at "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) "virtual address %016lx\n", address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) if (die("Oops", regs, isr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) regs = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) bust_spinlocks(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) if (regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) do_exit(SIGKILL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) out_of_memory:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) mmap_read_unlock(mm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) if (!user_mode(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) goto no_context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) pagefault_out_of_memory();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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