diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/parisc/mm/fault.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/parisc/mm/fault.c | 270 |
1 files changed, 0 insertions, 270 deletions
diff --git a/ANDROID_3.4.5/arch/parisc/mm/fault.c b/ANDROID_3.4.5/arch/parisc/mm/fault.c deleted file mode 100644 index 18162ce4..00000000 --- a/ANDROID_3.4.5/arch/parisc/mm/fault.c +++ /dev/null @@ -1,270 +0,0 @@ -/* - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * - * Copyright (C) 1995, 1996, 1997, 1998 by Ralf Baechle - * Copyright 1999 SuSE GmbH (Philipp Rumpf, prumpf@tux.org) - * Copyright 1999 Hewlett Packard Co. - * - */ - -#include <linux/mm.h> -#include <linux/ptrace.h> -#include <linux/sched.h> -#include <linux/interrupt.h> -#include <linux/module.h> - -#include <asm/uaccess.h> -#include <asm/traps.h> - -#define PRINT_USER_FAULTS /* (turn this on if you want user faults to be */ - /* dumped to the console via printk) */ - - -/* Various important other fields */ -#define bit22set(x) (x & 0x00000200) -#define bits23_25set(x) (x & 0x000001c0) -#define isGraphicsFlushRead(x) ((x & 0xfc003fdf) == 0x04001a80) - /* extended opcode is 0x6a */ - -#define BITSSET 0x1c0 /* for identifying LDCW */ - - -DEFINE_PER_CPU(struct exception_data, exception_data); - -/* - * parisc_acctyp(unsigned int inst) -- - * Given a PA-RISC memory access instruction, determine if the - * the instruction would perform a memory read or memory write - * operation. - * - * This function assumes that the given instruction is a memory access - * instruction (i.e. you should really only call it if you know that - * the instruction has generated some sort of a memory access fault). - * - * Returns: - * VM_READ if read operation - * VM_WRITE if write operation - * VM_EXEC if execute operation - */ -static unsigned long -parisc_acctyp(unsigned long code, unsigned int inst) -{ - if (code == 6 || code == 16) - return VM_EXEC; - - switch (inst & 0xf0000000) { - case 0x40000000: /* load */ - case 0x50000000: /* new load */ - return VM_READ; - - case 0x60000000: /* store */ - case 0x70000000: /* new store */ - return VM_WRITE; - - case 0x20000000: /* coproc */ - case 0x30000000: /* coproc2 */ - if (bit22set(inst)) - return VM_WRITE; - - case 0x0: /* indexed/memory management */ - if (bit22set(inst)) { - /* - * Check for the 'Graphics Flush Read' instruction. - * It resembles an FDC instruction, except for bits - * 20 and 21. Any combination other than zero will - * utilize the block mover functionality on some - * older PA-RISC platforms. The case where a block - * move is performed from VM to graphics IO space - * should be treated as a READ. - * - * The significance of bits 20,21 in the FDC - * instruction is: - * - * 00 Flush data cache (normal instruction behavior) - * 01 Graphics flush write (IO space -> VM) - * 10 Graphics flush read (VM -> IO space) - * 11 Graphics flush read/write (VM <-> IO space) - */ - if (isGraphicsFlushRead(inst)) - return VM_READ; - return VM_WRITE; - } else { - /* - * Check for LDCWX and LDCWS (semaphore instructions). - * If bits 23 through 25 are all 1's it is one of - * the above two instructions and is a write. - * - * Note: With the limited bits we are looking at, - * this will also catch PROBEW and PROBEWI. However, - * these should never get in here because they don't - * generate exceptions of the type: - * Data TLB miss fault/data page fault - * Data memory protection trap - */ - if (bits23_25set(inst) == BITSSET) - return VM_WRITE; - } - return VM_READ; /* Default */ - } - return VM_READ; /* Default */ -} - -#undef bit22set -#undef bits23_25set -#undef isGraphicsFlushRead -#undef BITSSET - - -#if 0 -/* This is the treewalk to find a vma which is the highest that has - * a start < addr. We're using find_vma_prev instead right now, but - * we might want to use this at some point in the future. Probably - * not, but I want it committed to CVS so I don't lose it :-) - */ - while (tree != vm_avl_empty) { - if (tree->vm_start > addr) { - tree = tree->vm_avl_left; - } else { - prev = tree; - if (prev->vm_next == NULL) - break; - if (prev->vm_next->vm_start > addr) - break; - tree = tree->vm_avl_right; - } - } -#endif - -int fixup_exception(struct pt_regs *regs) -{ - const struct exception_table_entry *fix; - - fix = search_exception_tables(regs->iaoq[0]); - if (fix) { - struct exception_data *d; - d = &__get_cpu_var(exception_data); - d->fault_ip = regs->iaoq[0]; - d->fault_space = regs->isr; - d->fault_addr = regs->ior; - - regs->iaoq[0] = ((fix->fixup) & ~3); - /* - * NOTE: In some cases the faulting instruction - * may be in the delay slot of a branch. We - * don't want to take the branch, so we don't - * increment iaoq[1], instead we set it to be - * iaoq[0]+4, and clear the B bit in the PSW - */ - regs->iaoq[1] = regs->iaoq[0] + 4; - regs->gr[0] &= ~PSW_B; /* IPSW in gr[0] */ - - return 1; - } - - return 0; -} - -void do_page_fault(struct pt_regs *regs, unsigned long code, - unsigned long address) -{ - struct vm_area_struct *vma, *prev_vma; - struct task_struct *tsk = current; - struct mm_struct *mm = tsk->mm; - unsigned long acc_type; - int fault; - - if (in_atomic() || !mm) - goto no_context; - - down_read(&mm->mmap_sem); - vma = find_vma_prev(mm, address, &prev_vma); - if (!vma || address < vma->vm_start) - goto check_expansion; -/* - * Ok, we have a good vm_area for this memory access. We still need to - * check the access permissions. - */ - -good_area: - - acc_type = parisc_acctyp(code,regs->iir); - - if ((vma->vm_flags & acc_type) != acc_type) - 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, (acc_type & VM_WRITE) ? FAULT_FLAG_WRITE : 0); - if (unlikely(fault & VM_FAULT_ERROR)) { - /* - * We hit a shared mapping outside of the file, or some - * other thing happened to us that made us unable to - * handle the page fault gracefully. - */ - if (fault & VM_FAULT_OOM) - goto out_of_memory; - else if (fault & VM_FAULT_SIGBUS) - goto bad_area; - BUG(); - } - if (fault & VM_FAULT_MAJOR) - current->maj_flt++; - else - current->min_flt++; - up_read(&mm->mmap_sem); - return; - -check_expansion: - vma = prev_vma; - if (vma && (expand_stack(vma, address) == 0)) - goto good_area; - -/* - * Something tried to access memory that isn't in our memory map.. - */ -bad_area: - up_read(&mm->mmap_sem); - - if (user_mode(regs)) { - struct siginfo si; - -#ifdef PRINT_USER_FAULTS - printk(KERN_DEBUG "\n"); - printk(KERN_DEBUG "do_page_fault() pid=%d command='%s' type=%lu address=0x%08lx\n", - task_pid_nr(tsk), tsk->comm, code, address); - if (vma) { - printk(KERN_DEBUG "vm_start = 0x%08lx, vm_end = 0x%08lx\n", - vma->vm_start, vma->vm_end); - } - show_regs(regs); -#endif - /* FIXME: actually we need to get the signo and code correct */ - si.si_signo = SIGSEGV; - si.si_errno = 0; - si.si_code = SEGV_MAPERR; - si.si_addr = (void __user *) address; - force_sig_info(SIGSEGV, &si, current); - return; - } - -no_context: - - if (!user_mode(regs) && fixup_exception(regs)) { - return; - } - - parisc_terminate("Bad Address (null pointer deref?)", regs, code, address); - - out_of_memory: - up_read(&mm->mmap_sem); - if (!user_mode(regs)) - goto no_context; - pagefault_out_of_memory(); -} |