diff options
Diffstat (limited to 'arch/arm/mm/fault.c')
| -rw-r--r-- | arch/arm/mm/fault.c | 80 |
1 files changed, 36 insertions, 44 deletions
diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c index 29be1c01894..e25b4fd8412 100644 --- a/arch/arm/mm/fault.c +++ b/arch/arm/mm/fault.c @@ -108,14 +108,15 @@ __do_kernel_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr, */ static void __do_user_fault(struct task_struct *tsk, unsigned long addr, - unsigned int fsr, int code, struct pt_regs *regs) + unsigned int fsr, unsigned int sig, int code, + struct pt_regs *regs) { struct siginfo si; #ifdef CONFIG_DEBUG_USER if (user_debug & UDBG_SEGV) { - printk(KERN_DEBUG "%s: unhandled page fault at 0x%08lx, code 0x%03x\n", - tsk->comm, addr, fsr); + printk(KERN_DEBUG "%s: unhandled page fault (%d) at 0x%08lx, code 0x%03x\n", + tsk->comm, sig, addr, fsr); show_pte(tsk->mm, addr); show_regs(regs); } @@ -124,11 +125,11 @@ __do_user_fault(struct task_struct *tsk, unsigned long addr, tsk->thread.address = addr; tsk->thread.error_code = fsr; tsk->thread.trap_no = 14; - si.si_signo = SIGSEGV; + si.si_signo = sig; si.si_errno = 0; si.si_code = code; si.si_addr = (void __user *)addr; - force_sig_info(SIGSEGV, &si, tsk); + force_sig_info(sig, &si, tsk); } void @@ -140,7 +141,7 @@ do_bad_area(struct task_struct *tsk, struct mm_struct *mm, unsigned long addr, * have no context to handle this fault with. */ if (user_mode(regs)) - __do_user_fault(tsk, addr, fsr, SEGV_MAPERR, regs); + __do_user_fault(tsk, addr, fsr, SIGSEGV, SEGV_MAPERR, regs); else __do_kernel_fault(mm, addr, fsr, regs); } @@ -201,10 +202,11 @@ survive: goto out; /* - * If we are out of memory for pid1, - * sleep for a while and retry + * If we are out of memory for pid1, sleep for a while and retry */ + up_read(&mm->mmap_sem); yield(); + down_read(&mm->mmap_sem); goto survive; check_stack: @@ -219,7 +221,7 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) { struct task_struct *tsk; struct mm_struct *mm; - int fault; + int fault, sig, code; tsk = current; mm = tsk->mm; @@ -242,55 +244,45 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) return 0; /* - * We had some memory, but were unable to - * successfully fix up this page fault. - */ - if (fault == 0) - goto do_sigbus; - - /* * If we are in kernel mode at this point, we * have no context to handle this fault with. */ if (!user_mode(regs)) goto no_context; - if (fault == VM_FAULT_OOM) { + switch (fault) { + case VM_FAULT_OOM: /* - * We ran out of memory, or some other thing happened to - * us that made us unable to handle the page fault gracefully. + * We ran out of memory, or some other thing + * happened to us that made us unable to handle + * the page fault gracefully. */ printk("VM: killing process %s\n", tsk->comm); do_exit(SIGKILL); - } else - __do_user_fault(tsk, addr, fsr, fault == VM_FAULT_BADACCESS ? - SEGV_ACCERR : SEGV_MAPERR, regs); - return 0; + return 0; + case 0: + /* + * We had some memory, but were unable to + * successfully fix up this page fault. + */ + sig = SIGBUS; + code = BUS_ADRERR; + break; -/* - * We ran out of memory, or some other thing happened to us that made - * us unable to handle the page fault gracefully. - */ -do_sigbus: - /* - * Send a sigbus, regardless of whether we were in kernel - * or user mode. - */ - tsk->thread.address = addr; - tsk->thread.error_code = fsr; - tsk->thread.trap_no = 14; - force_sig(SIGBUS, tsk); -#ifdef CONFIG_DEBUG_USER - if (user_debug & UDBG_BUS) { - printk(KERN_DEBUG "%s: sigbus at 0x%08lx, pc=0x%08lx\n", - current->comm, addr, instruction_pointer(regs)); + default: + /* + * Something tried to access memory that + * isn't in our memory map.. + */ + sig = SIGSEGV; + code = fault == VM_FAULT_BADACCESS ? + SEGV_ACCERR : SEGV_MAPERR; + break; } -#endif - /* Kernel mode? Handle exceptions or die */ - if (user_mode(regs)) - return 0; + __do_user_fault(tsk, addr, fsr, sig, code, regs); + return 0; no_context: __do_kernel_fault(mm, addr, fsr, regs); |