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-rw-r--r--arch/frv/mm/fault.c328
1 files changed, 0 insertions, 328 deletions
diff --git a/arch/frv/mm/fault.c b/arch/frv/mm/fault.c
deleted file mode 100644
index cbe7aec863e3..000000000000
--- a/arch/frv/mm/fault.c
+++ /dev/null
@@ -1,328 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * linux/arch/frv/mm/fault.c
- *
- * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
- * - Written by David Howells (dhowells@redhat.com)
- * - Derived from arch/m68knommu/mm/fault.c
- * - Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>,
- * - Copyright (C) 2000 Lineo, Inc. (www.lineo.com)
- *
- * Based on:
- *
- * linux/arch/m68k/mm/fault.c
- *
- * Copyright (C) 1995 Hamish Macdonald
- */
-
-#include <linux/mman.h>
-#include <linux/mm.h>
-#include <linux/kernel.h>
-#include <linux/ptrace.h>
-#include <linux/hardirq.h>
-#include <linux/uaccess.h>
-
-#include <asm/pgtable.h>
-#include <asm/gdb-stub.h>
-
-/*****************************************************************************/
-/*
- * This routine handles page faults. It determines the problem, and
- * then passes it off to one of the appropriate routines.
- */
-asmlinkage void do_page_fault(int datammu, unsigned long esr0, unsigned long ear0)
-{
- struct vm_area_struct *vma;
- struct mm_struct *mm;
- unsigned long _pme, lrai, lrad;
- unsigned long flags = 0;
- siginfo_t info;
- pgd_t *pge;
- pud_t *pue;
- pte_t *pte;
- int fault;
-
-#if 0
- const char *atxc[16] = {
- [0x0] = "mmu-miss", [0x8] = "multi-dat", [0x9] = "multi-sat",
- [0xa] = "tlb-miss", [0xc] = "privilege", [0xd] = "write-prot",
- };
-
- printk("do_page_fault(%d,%lx [%s],%lx)\n",
- datammu, esr0, atxc[esr0 >> 20 & 0xf], ear0);
-#endif
-
- mm = current->mm;
-
- /*
- * 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.
- *
- * This verifies that the fault happens in kernel space
- * and that the fault was a page not present (invalid) error
- */
- if (!user_mode(__frame) && (esr0 & ESR0_ATXC) == ESR0_ATXC_AMRTLB_MISS) {
- if (ear0 >= VMALLOC_START && ear0 < VMALLOC_END)
- goto kernel_pte_fault;
- if (ear0 >= PKMAP_BASE && ear0 < PKMAP_END)
- goto kernel_pte_fault;
- }
-
- info.si_code = SEGV_MAPERR;
-
- /*
- * If we're in an interrupt or have no user
- * context, we must not take the fault..
- */
- if (faulthandler_disabled() || !mm)
- goto no_context;
-
- if (user_mode(__frame))
- flags |= FAULT_FLAG_USER;
-
- down_read(&mm->mmap_sem);
-
- vma = find_vma(mm, ear0);
- if (!vma)
- goto bad_area;
- if (vma->vm_start <= ear0)
- goto good_area;
- if (!(vma->vm_flags & VM_GROWSDOWN))
- goto bad_area;
-
- if (user_mode(__frame)) {
- /*
- * accessing the stack below %esp is always a bug.
- * The "+ 32" is there due to some instructions (like
- * pusha) doing post-decrement on the stack and that
- * doesn't show up until later..
- */
- if ((ear0 & PAGE_MASK) + 2 * PAGE_SIZE < __frame->sp) {
-#if 0
- printk("[%d] ### Access below stack @%lx (sp=%lx)\n",
- current->pid, ear0, __frame->sp);
- show_registers(__frame);
- printk("[%d] ### Code: [%08lx] %02x %02x %02x %02x %02x %02x %02x %02x\n",
- current->pid,
- __frame->pc,
- ((u8*)__frame->pc)[0],
- ((u8*)__frame->pc)[1],
- ((u8*)__frame->pc)[2],
- ((u8*)__frame->pc)[3],
- ((u8*)__frame->pc)[4],
- ((u8*)__frame->pc)[5],
- ((u8*)__frame->pc)[6],
- ((u8*)__frame->pc)[7]
- );
-#endif
- goto bad_area;
- }
- }
-
- if (expand_stack(vma, ear0))
- 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;
- switch (esr0 & ESR0_ATXC) {
- default:
- /* handle write to write protected page */
- case ESR0_ATXC_WP_EXCEP:
-#ifdef TEST_VERIFY_AREA
- if (!(user_mode(__frame)))
- printk("WP fault at %08lx\n", __frame->pc);
-#endif
- if (!(vma->vm_flags & VM_WRITE))
- goto bad_area;
- flags |= FAULT_FLAG_WRITE;
- break;
-
- /* handle read from protected page */
- case ESR0_ATXC_PRIV_EXCEP:
- goto bad_area;
-
- /* handle read, write or exec on absent page
- * - can't support write without permitting read
- * - don't support execute without permitting read and vice-versa
- */
- case ESR0_ATXC_AMRTLB_MISS:
- if (!(vma->vm_flags & (VM_READ | VM_WRITE | VM_EXEC)))
- goto bad_area;
- break;
- }
-
- /*
- * 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(vma, ear0, flags);
- if (unlikely(fault & VM_FAULT_ERROR)) {
- if (fault & VM_FAULT_OOM)
- goto out_of_memory;
- else if (fault & VM_FAULT_SIGSEGV)
- goto bad_area;
- 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);
-
- /* User mode accesses just cause a SIGSEGV */
- if (user_mode(__frame)) {
- info.si_signo = SIGSEGV;
- info.si_errno = 0;
- /* info.si_code has been set above */
- info.si_addr = (void *) ear0;
- force_sig_info(SIGSEGV, &info, current);
- return;
- }
-
- no_context:
- /* are we prepared to handle this kernel fault? */
- if (fixup_exception(__frame))
- return;
-
-/*
- * Oops. The kernel tried to access some bad page. We'll have to
- * terminate things with extreme prejudice.
- */
-
- bust_spinlocks(1);
-
- if (ear0 < PAGE_SIZE)
- printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
- else
- printk(KERN_ALERT "Unable to handle kernel paging request");
- printk(" at virtual addr %08lx\n", ear0);
- printk(" PC : %08lx\n", __frame->pc);
- printk(" EXC : esr0=%08lx ear0=%08lx\n", esr0, ear0);
-
- asm("lrai %1,%0,#1,#0,#0" : "=&r"(lrai) : "r"(ear0));
- asm("lrad %1,%0,#1,#0,#0" : "=&r"(lrad) : "r"(ear0));
-
- printk(KERN_ALERT " LRAI: %08lx\n", lrai);
- printk(KERN_ALERT " LRAD: %08lx\n", lrad);
-
- __break_hijack_kernel_event();
-
- pge = pgd_offset(current->mm, ear0);
- pue = pud_offset(pge, ear0);
- _pme = pue->pue[0].ste[0];
-
- printk(KERN_ALERT " PGE : %8p { PME %08lx }\n", pge, _pme);
-
- if (_pme & xAMPRx_V) {
- unsigned long dampr, damlr, val;
-
- asm volatile("movsg dampr2,%0 ! movgs %2,dampr2 ! movsg damlr2,%1"
- : "=&r"(dampr), "=r"(damlr)
- : "r" (_pme | xAMPRx_L|xAMPRx_SS_16Kb|xAMPRx_S|xAMPRx_C|xAMPRx_V)
- );
-
- pte = (pte_t *) damlr + __pte_index(ear0);
- val = pte_val(*pte);
-
- asm volatile("movgs %0,dampr2" :: "r" (dampr));
-
- printk(KERN_ALERT " PTE : %8p { %08lx }\n", pte, val);
- }
-
- die_if_kernel("Oops\n");
- 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 (!user_mode(__frame))
- goto no_context;
- pagefault_out_of_memory();
- return;
-
- do_sigbus:
- up_read(&mm->mmap_sem);
-
- /*
- * Send a sigbus, regardless of whether we were in kernel
- * or user mode.
- */
- info.si_signo = SIGBUS;
- info.si_errno = 0;
- info.si_code = BUS_ADRERR;
- info.si_addr = (void *) ear0;
- force_sig_info(SIGBUS, &info, current);
-
- /* Kernel mode? Handle exceptions or die */
- if (!user_mode(__frame))
- goto no_context;
- return;
-
-/*
- * The fault was caused by a kernel PTE (such as installed by vmalloc or kmap)
- */
- kernel_pte_fault:
- {
- /*
- * Synchronize this task's top level page-table
- * with the 'reference' page table.
- *
- * Do _not_ use "tsk" here. We might be inside
- * an interrupt in the middle of a task switch..
- */
- int index = pgd_index(ear0);
- pgd_t *pgd, *pgd_k;
- pud_t *pud, *pud_k;
- pmd_t *pmd, *pmd_k;
- pte_t *pte_k;
-
- pgd = (pgd_t *) __get_TTBR();
- pgd = (pgd_t *)__va(pgd) + index;
- pgd_k = ((pgd_t *)(init_mm.pgd)) + index;
-
- if (!pgd_present(*pgd_k))
- goto no_context;
- //set_pgd(pgd, *pgd_k); /////// gcc ICE's on this line
-
- pud_k = pud_offset(pgd_k, ear0);
- if (!pud_present(*pud_k))
- goto no_context;
-
- pmd_k = pmd_offset(pud_k, ear0);
- if (!pmd_present(*pmd_k))
- goto no_context;
-
- pud = pud_offset(pgd, ear0);
- pmd = pmd_offset(pud, ear0);
- set_pmd(pmd, *pmd_k);
-
- pte_k = pte_offset_kernel(pmd_k, ear0);
- if (!pte_present(*pte_k))
- goto no_context;
- return;
- }
-} /* end do_page_fault() */
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.