diff options
Diffstat (limited to 'arch/sparc64/mm/fault.c')
| -rw-r--r-- | arch/sparc64/mm/fault.c | 161 |
1 files changed, 95 insertions, 66 deletions
diff --git a/arch/sparc64/mm/fault.c b/arch/sparc64/mm/fault.c index 6df923a4b..5e16e1218 100644 --- a/arch/sparc64/mm/fault.c +++ b/arch/sparc64/mm/fault.c @@ -1,4 +1,4 @@ -/* $Id: fault.c,v 1.11 1997/06/01 05:46:15 davem Exp $ +/* $Id: fault.c,v 1.18 1997/07/17 02:20:56 davem Exp $ * arch/sparc64/mm/fault.c: Page fault handlers for the 64-bit Sparc. * * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) @@ -134,44 +134,14 @@ asmlinkage int lookup_fault(unsigned long pc, unsigned long ret_pc, return 0; } -/* #define FAULT_TRACER */ -/* #define FAULT_TRACER_VERBOSE */ +/* #define DEBUG_EXCEPTIONS */ -asmlinkage void do_sparc64_fault(struct pt_regs *regs, int text_fault, int write, - unsigned long address, unsigned long tag, - unsigned long sfsr) +asmlinkage void do_sparc64_fault(struct pt_regs *regs, unsigned long address, int write) { + struct mm_struct *mm = current->mm; struct vm_area_struct *vma; - struct task_struct *tsk = current; - struct mm_struct *mm = tsk->mm; - unsigned long fixup; - unsigned long g2; - int from_user = !(regs->tstate & TSTATE_PRIV); -#ifdef FAULT_TRACER - static unsigned long last_addr = 0; - static int rcnt = 0; - -#ifdef FAULT_TRACER_VERBOSE - printk("FAULT(PC[%016lx],t[%d],w[%d],addr[%016lx])...", - regs->tpc, text_fault, write, address); -#else - printk("F[%016lx:%016lx:w(%d)", regs->tpc, address, write); -#endif - if(address == last_addr) { - if(rcnt++ > 15) { - printk("Wheee lotsa bogus faults, something wrong, spinning\n"); - __asm__ __volatile__("flushw"); - printk("o7[%016lx] i7[%016lx]\n", - regs->u_regs[UREG_I7], - ((struct reg_window *)(regs->u_regs[UREG_FP]+STACK_BIAS))->ins[7]); - sti(); - while(1) - barrier(); - } - } else rcnt = 0; - last_addr = address; -#endif - lock_kernel (); + + lock_kernel(); down(&mm->mmap_sem); vma = find_vma(mm, address); if(!vma) @@ -204,40 +174,99 @@ good_area: */ bad_area: up(&mm->mmap_sem); - /* Is this in ex_table? */ + + { + unsigned long g2 = regs->u_regs[UREG_G2]; + + /* Is this in ex_table? */ + if (regs->tstate & TSTATE_PRIV) { + unsigned char asi = ASI_P; + unsigned int insn; + unsigned long fixup; + + insn = *(unsigned int *)regs->tpc; + if ((insn & 0xc0800000) == 0xc0800000) { + if (insn & 0x2000) + asi = (regs->tstate >> 24); + else + asi = (insn >> 5); + } - g2 = regs->u_regs[UREG_G2]; - if (!from_user && (fixup = search_exception_table (regs->tpc, &g2))) { - printk("Exception: PC<%016lx> faddr<%016lx>\n", regs->tpc, address); - printk("EX_TABLE: insn<%016lx> fixup<%016lx> g2<%016lx>\n", - regs->tpc, fixup, g2); - regs->tpc = fixup; - regs->tnpc = regs->tpc + 4; - regs->u_regs[UREG_G2] = g2; - goto out; - } - if(from_user) { -#if 1 - unsigned long cpc; - __asm__ __volatile__("mov %%i7, %0" : "=r" (cpc)); - printk("[%s:%d] SIGSEGV pc[%016lx] addr[%016lx] w[%d] sfsr[%016lx] " - "caller[%016lx]\n", current->comm, current->pid, regs->tpc, - address, write, sfsr, cpc); + /* Look in asi.h: All _S asis have LS bit set */ + if ((asi & 0x1) && + (fixup = search_exception_table (regs->tpc, &g2))) { +#ifdef DEBUG_EXCEPTIONS + printk("Exception: PC<%016lx> faddr<%016lx>\n", + regs->tpc, address); + printk("EX_TABLE: insn<%016lx> fixup<%016lx> " + "g2<%016lx>\n", regs->tpc, fixup, g2); #endif - tsk->tss.sig_address = address; - tsk->tss.sig_desc = SUBSIG_NOMAPPING; - send_sig(SIGSEGV, tsk, 1); - goto out; + regs->tpc = fixup; + regs->tnpc = regs->tpc + 4; + regs->u_regs[UREG_G2] = g2; + goto out; + } + } else { + current->tss.sig_address = address; + current->tss.sig_desc = SUBSIG_NOMAPPING; + send_sig(SIGSEGV, current, 1); + goto out; + } + unhandled_fault (address, current, regs); } - unhandled_fault (address, tsk, regs); out: unlock_kernel(); -#ifdef FAULT_TRACER -#ifdef FAULT_TRACER_VERBOSE - printk(" done\n"); -#else - printk("]"); -#endif -#endif } +void fixup_dcache_alias(struct vm_area_struct *vma, unsigned long address, pte_t pte) +{ + struct vm_area_struct *vmaring; + struct inode *inode; + unsigned long vaddr, offset, start; + pgd_t *pgdp; + pmd_t *pmdp; + pte_t *ptep; + int alias_found = 0; + + inode = vma->vm_dentry->d_inode; + if(!inode) + return; + + offset = (address & PAGE_MASK) - vma->vm_start; + vmaring = inode->i_mmap; + do { + vaddr = vmaring->vm_start + offset; + + /* This conditional is misleading... */ + if((vaddr ^ address) & PAGE_SIZE) { + alias_found++; + start = vmaring->vm_start; + while(start < vmaring->vm_end) { + pgdp = pgd_offset(vmaring->vm_mm, start); + if(!pgdp) goto next; + pmdp = pmd_offset(pgdp, start); + if(!pmdp) goto next; + ptep = pte_offset(pmdp, start); + if(!ptep) goto next; + + if(pte_val(*ptep) & _PAGE_PRESENT) { + flush_cache_page(vmaring, start); + *ptep = __pte(pte_val(*ptep) & + ~(_PAGE_CV)); + flush_tlb_page(vmaring, start); + } + next: + start += PAGE_SIZE; + } + } + } while((vmaring = vmaring->vm_next_share) != NULL); + + if(alias_found && (pte_val(pte) & _PAGE_CV)) { + pgdp = pgd_offset(vma->vm_mm, address); + pmdp = pmd_offset(pgdp, address); + ptep = pte_offset(pmdp, address); + flush_cache_page(vma, address); + *ptep = __pte(pte_val(*ptep) & ~(_PAGE_CV)); + flush_tlb_page(vma, address); + } +} |