diff options
Diffstat (limited to 'arch/parisc/mm')
| -rw-r--r-- | arch/parisc/mm/fault.c | 58 |
1 files changed, 31 insertions, 27 deletions
diff --git a/arch/parisc/mm/fault.c b/arch/parisc/mm/fault.c index b2e3e9a8cece..92c7fa4ecc3f 100644 --- a/arch/parisc/mm/fault.c +++ b/arch/parisc/mm/fault.c @@ -139,13 +139,41 @@ parisc_acctyp(unsigned long code, unsigned int inst) } #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; - const struct exception_table_entry *fix; unsigned long acc_type; int fault; @@ -229,32 +257,8 @@ bad_area: no_context: - if (!user_mode(regs)) { - 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; - } + if (!user_mode(regs) && fixup_exception(regs)) { + return; } parisc_terminate("Bad Address (null pointer deref?)", regs, code, address); |