X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fia64%2Fkernel%2Ftraps.c;h=7c1ddc8ac44325d7600ced23ed9457ea68ac6a78;hb=43bc926fffd92024b46cafaf7350d669ba9ca884;hp=e021594d777653e550cf62dd8c55c6be4e383c78;hpb=5273a3df6485dc2ad6aa7ddd441b9a21970f003b;p=linux-2.6.git diff --git a/arch/ia64/kernel/traps.c b/arch/ia64/kernel/traps.c index e021594d7..7c1ddc8ac 100644 --- a/arch/ia64/kernel/traps.c +++ b/arch/ia64/kernel/traps.c @@ -14,42 +14,38 @@ #include #include /* For unblank_screen() */ #include /* for EXPORT_SYMBOL */ +#include +#include +#include /* for ssleep() */ #include -#include #include #include #include #include - -/* - * fp_emulate() needs to be able to access and update all floating point registers. Those - * saved in pt_regs can be accessed through that structure, but those not saved, will be - * accessed directly. To make this work, we need to ensure that the compiler does not end - * up using a preserved floating point register on its own. The following achieves this - * by declaring preserved registers that are not marked as "fixed" as global register - * variables. - */ -#ifdef ASM_SUPPORTED -register double f2 asm ("f2"); register double f3 asm ("f3"); -register double f4 asm ("f4"); register double f5 asm ("f5"); - -register long f16 asm ("f16"); register long f17 asm ("f17"); -register long f18 asm ("f18"); register long f19 asm ("f19"); -register long f20 asm ("f20"); register long f21 asm ("f21"); -register long f22 asm ("f22"); register long f23 asm ("f23"); - -register double f24 asm ("f24"); register double f25 asm ("f25"); -register double f26 asm ("f26"); register double f27 asm ("f27"); -register double f28 asm ("f28"); register double f29 asm ("f29"); -register double f30 asm ("f30"); register double f31 asm ("f31"); -#endif +#include extern spinlock_t timerlist_lock; fpswa_interface_t *fpswa_interface; EXPORT_SYMBOL(fpswa_interface); +ATOMIC_NOTIFIER_HEAD(ia64die_chain); + +int +register_die_notifier(struct notifier_block *nb) +{ + return atomic_notifier_chain_register(&ia64die_chain, nb); +} +EXPORT_SYMBOL_GPL(register_die_notifier); + +int +unregister_die_notifier(struct notifier_block *nb) +{ + return atomic_notifier_chain_unregister(&ia64die_chain, nb); +} +EXPORT_SYMBOL_GPL(unregister_die_notifier); + void __init trap_init (void) { @@ -99,18 +95,21 @@ die (const char *str, struct pt_regs *regs, long err) .lock_owner_depth = 0 }; static int die_counter; + int cpu = get_cpu(); - if (die.lock_owner != smp_processor_id()) { + if (die.lock_owner != cpu) { console_verbose(); spin_lock_irq(&die.lock); - die.lock_owner = smp_processor_id(); + die.lock_owner = cpu; die.lock_owner_depth = 0; bust_spinlocks(1); } + put_cpu(); if (++die.lock_owner_depth < 3) { printk("%s[%d]: %s %ld [%d]\n", current->comm, current->pid, str, err, ++die_counter); + (void) notify_die(DIE_OOPS, (char *)str, regs, err, 255, SIGSEGV); show_regs(regs); } else printk(KERN_ERR "Recursive die() failure, output suppressed\n"); @@ -118,6 +117,13 @@ die (const char *str, struct pt_regs *regs, long err) bust_spinlocks(0); die.lock_owner = -1; spin_unlock_irq(&die.lock); + + if (panic_on_oops) { + printk(KERN_EMERG "Fatal exception: panic in 5 seconds\n"); + ssleep(5); + panic("Fatal exception"); + } + do_exit(SIGSEGV); } @@ -129,19 +135,22 @@ die_if_kernel (char *str, struct pt_regs *regs, long err) } void -ia64_bad_break (unsigned long break_num, struct pt_regs *regs) +__kprobes ia64_bad_break (unsigned long break_num, struct pt_regs *regs) { siginfo_t siginfo; int sig, code; /* SIGILL, SIGFPE, SIGSEGV, and SIGBUS want these field initialized: */ - siginfo.si_addr = (void *) (regs->cr_iip + ia64_psr(regs)->ri); + siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri); siginfo.si_imm = break_num; siginfo.si_flags = 0; /* clear __ISR_VALID */ siginfo.si_isr = 0; switch (break_num) { case 0: /* unknown error (used by GCC for __builtin_abort()) */ + if (notify_die(DIE_BREAK, "break 0", regs, break_num, TRAP_BRKPT, SIGTRAP) + == NOTIFY_STOP) + return; die_if_kernel("bugcheck!", regs, break_num); sig = SIGILL; code = ILL_ILLOPC; break; @@ -201,6 +210,9 @@ ia64_bad_break (unsigned long break_num, struct pt_regs *regs) if (break_num < 0x80000) { sig = SIGILL; code = __ILL_BREAK; } else { + if (notify_die(DIE_BREAK, "bad break", regs, break_num, TRAP_BRKPT, SIGTRAP) + == NOTIFY_STOP) + return; sig = SIGTRAP; code = TRAP_BRKPT; } } @@ -225,13 +237,21 @@ disabled_fph_fault (struct pt_regs *regs) /* first, grant user-level access to fph partition: */ psr->dfh = 0; + + /* + * Make sure that no other task gets in on this processor + * while we're claiming the FPU + */ + preempt_disable(); #ifndef CONFIG_SMP { struct task_struct *fpu_owner = (struct task_struct *)ia64_get_kr(IA64_KR_FPU_OWNER); - if (ia64_is_local_fpu_owner(current)) + if (ia64_is_local_fpu_owner(current)) { + preempt_enable_no_resched(); return; + } if (fpu_owner) ia64_flush_fph(fpu_owner); @@ -249,6 +269,7 @@ disabled_fph_fault (struct pt_regs *regs) */ psr->mfh = 1; } + preempt_enable_no_resched(); } static inline int @@ -305,7 +326,7 @@ handle_fpu_swa (int fp_fault, struct pt_regs *regs, unsigned long isr) fault_ip = regs->cr_iip; if (!fp_fault && (ia64_psr(regs)->ri == 0)) fault_ip -= 16; - if (copy_from_user(bundle, (void *) fault_ip, sizeof(bundle))) + if (copy_from_user(bundle, (void __user *) fault_ip, sizeof(bundle))) return -1; if (jiffies - last_time > 5*HZ) @@ -335,7 +356,7 @@ handle_fpu_swa (int fp_fault, struct pt_regs *regs, unsigned long isr) siginfo.si_signo = SIGFPE; siginfo.si_errno = 0; siginfo.si_code = __SI_FAULT; /* default code */ - siginfo.si_addr = (void *) (regs->cr_iip + ia64_psr(regs)->ri); + siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri); if (isr & 0x11) { siginfo.si_code = FPE_FLTINV; } else if (isr & 0x22) { @@ -359,7 +380,7 @@ handle_fpu_swa (int fp_fault, struct pt_regs *regs, unsigned long isr) siginfo.si_signo = SIGFPE; siginfo.si_errno = 0; siginfo.si_code = __SI_FAULT; /* default code */ - siginfo.si_addr = (void *) (regs->cr_iip + ia64_psr(regs)->ri); + siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri); if (isr & 0x880) { siginfo.si_code = FPE_FLTOVF; } else if (isr & 0x1100) { @@ -381,11 +402,10 @@ struct illegal_op_return { }; struct illegal_op_return -ia64_illegal_op_fault (unsigned long ec, unsigned long arg1, unsigned long arg2, - unsigned long arg3, unsigned long arg4, unsigned long arg5, - unsigned long arg6, unsigned long arg7, unsigned long stack) +ia64_illegal_op_fault (unsigned long ec, long arg1, long arg2, long arg3, + long arg4, long arg5, long arg6, long arg7, + struct pt_regs regs) { - struct pt_regs *regs = (struct pt_regs *) &stack; struct illegal_op_return rv; struct siginfo si; char buf[128]; @@ -394,31 +414,30 @@ ia64_illegal_op_fault (unsigned long ec, unsigned long arg1, unsigned long arg2, { extern struct illegal_op_return ia64_emulate_brl (struct pt_regs *, unsigned long); - rv = ia64_emulate_brl(regs, ec); + rv = ia64_emulate_brl(®s, ec); if (rv.fkt != (unsigned long) -1) return rv; } #endif sprintf(buf, "IA-64 Illegal operation fault"); - die_if_kernel(buf, regs, 0); + die_if_kernel(buf, ®s, 0); memset(&si, 0, sizeof(si)); si.si_signo = SIGILL; si.si_code = ILL_ILLOPC; - si.si_addr = (void *) (regs->cr_iip + ia64_psr(regs)->ri); + si.si_addr = (void __user *) (regs.cr_iip + ia64_psr(®s)->ri); force_sig_info(SIGILL, &si, current); rv.fkt = 0; return rv; } -void +void __kprobes ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa, - unsigned long iim, unsigned long itir, unsigned long arg5, - unsigned long arg6, unsigned long arg7, unsigned long stack) + unsigned long iim, unsigned long itir, long arg5, long arg6, + long arg7, struct pt_regs regs) { - struct pt_regs *regs = (struct pt_regs *) &stack; - unsigned long code, error = isr; + unsigned long code, error = isr, iip; struct siginfo siginfo; char buf[128]; int result, sig; @@ -438,10 +457,12 @@ ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa, * This fault was due to lfetch.fault, set "ed" bit in the psr to cancel * the lfetch. */ - ia64_psr(regs)->ed = 1; + ia64_psr(®s)->ed = 1; return; } + iip = regs.cr_iip + ia64_psr(®s)->ri; + switch (vector) { case 24: /* General Exception */ code = (isr >> 4) & 0xf; @@ -451,8 +472,8 @@ ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa, if (code == 8) { # ifdef CONFIG_IA64_PRINT_HAZARDS printk("%s[%d]: possible hazard @ ip=%016lx (pr = %016lx)\n", - current->comm, current->pid, regs->cr_iip + ia64_psr(regs)->ri, - regs->pr); + current->comm, current->pid, + regs.cr_iip + ia64_psr(®s)->ri, regs.pr); # endif return; } @@ -460,26 +481,27 @@ ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa, case 25: /* Disabled FP-Register */ if (isr & 2) { - disabled_fph_fault(regs); + disabled_fph_fault(®s); return; } sprintf(buf, "Disabled FPL fault---not supposed to happen!"); break; case 26: /* NaT Consumption */ - if (user_mode(regs)) { - void *addr; + if (user_mode(®s)) { + void __user *addr; if (((isr >> 4) & 0xf) == 2) { /* NaT page consumption */ sig = SIGSEGV; code = SEGV_ACCERR; - addr = (void *) ifa; + addr = (void __user *) ifa; } else { /* register NaT consumption */ sig = SIGILL; code = ILL_ILLOPN; - addr = (void *) (regs->cr_iip + ia64_psr(regs)->ri); + addr = (void __user *) (regs.cr_iip + + ia64_psr(®s)->ri); } siginfo.si_signo = sig; siginfo.si_code = code; @@ -490,17 +512,17 @@ ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa, siginfo.si_isr = isr; force_sig_info(sig, &siginfo, current); return; - } else if (ia64_done_with_exception(regs)) + } else if (ia64_done_with_exception(®s)) return; sprintf(buf, "NaT consumption"); break; case 31: /* Unsupported Data Reference */ - if (user_mode(regs)) { + if (user_mode(®s)) { siginfo.si_signo = SIGILL; siginfo.si_code = ILL_ILLOPN; siginfo.si_errno = 0; - siginfo.si_addr = (void *) (regs->cr_iip + ia64_psr(regs)->ri); + siginfo.si_addr = (void __user *) iip; siginfo.si_imm = vector; siginfo.si_flags = __ISR_VALID; siginfo.si_isr = isr; @@ -513,21 +535,24 @@ ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa, case 29: /* Debug */ case 35: /* Taken Branch Trap */ case 36: /* Single Step Trap */ - if (fsys_mode(current, regs)) { + if (fsys_mode(current, ®s)) { extern char __kernel_syscall_via_break[]; /* - * Got a trap in fsys-mode: Taken Branch Trap and Single Step trap - * need special handling; Debug trap is not supposed to happen. + * Got a trap in fsys-mode: Taken Branch Trap + * and Single Step trap need special handling; + * Debug trap is ignored (we disable it here + * and re-enable it in the lower-privilege trap). */ if (unlikely(vector == 29)) { - die("Got debug trap in fsys-mode---not supposed to happen!", - regs, 0); + set_thread_flag(TIF_DB_DISABLED); + ia64_psr(®s)->db = 0; + ia64_psr(®s)->lp = 1; return; } /* re-do the system call via break 0x100000: */ - regs->cr_iip = (unsigned long) __kernel_syscall_via_break; - ia64_psr(regs)->ri = 0; - ia64_psr(regs)->cpl = 3; + regs.cr_iip = (unsigned long) __kernel_syscall_via_break; + ia64_psr(®s)->ri = 0; + ia64_psr(®s)->cpl = 3; return; } switch (vector) { @@ -538,16 +563,19 @@ ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa, * Erratum 10 (IFA may contain incorrect address) now has * "NoFix" status. There are no plans for fixing this. */ - if (ia64_psr(regs)->is == 0) - ifa = regs->cr_iip; + if (ia64_psr(®s)->is == 0) + ifa = regs.cr_iip; #endif break; case 35: siginfo.si_code = TRAP_BRANCH; ifa = 0; break; case 36: siginfo.si_code = TRAP_TRACE; ifa = 0; break; } + if (notify_die(DIE_FAULT, "ia64_fault", ®s, vector, siginfo.si_code, SIGTRAP) + == NOTIFY_STOP) + return; siginfo.si_signo = SIGTRAP; siginfo.si_errno = 0; - siginfo.si_addr = (void *) ifa; + siginfo.si_addr = (void __user *) ifa; siginfo.si_imm = 0; siginfo.si_flags = __ISR_VALID; siginfo.si_isr = isr; @@ -556,12 +584,12 @@ ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa, case 32: /* fp fault */ case 33: /* fp trap */ - result = handle_fpu_swa((vector == 32) ? 1 : 0, regs, isr); + result = handle_fpu_swa((vector == 32) ? 1 : 0, ®s, isr); if ((result < 0) || (current->thread.flags & IA64_THREAD_FPEMU_SIGFPE)) { siginfo.si_signo = SIGFPE; siginfo.si_errno = 0; siginfo.si_code = FPE_FLTINV; - siginfo.si_addr = (void *) (regs->cr_iip + ia64_psr(regs)->ri); + siginfo.si_addr = (void __user *) iip; siginfo.si_flags = __ISR_VALID; siginfo.si_isr = isr; siginfo.si_imm = 0; @@ -572,23 +600,32 @@ ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa, case 34: if (isr & 0x2) { /* Lower-Privilege Transfer Trap */ + + /* If we disabled debug traps during an fsyscall, + * re-enable them here. + */ + if (test_thread_flag(TIF_DB_DISABLED)) { + clear_thread_flag(TIF_DB_DISABLED); + ia64_psr(®s)->db = 1; + } + /* - * Just clear PSR.lp and then return immediately: all the - * interesting work (e.g., signal delivery is done in the kernel - * exit path). + * Just clear PSR.lp and then return immediately: + * all the interesting work (e.g., signal delivery) + * is done in the kernel exit path. */ - ia64_psr(regs)->lp = 0; + ia64_psr(®s)->lp = 0; return; } else { /* Unimplemented Instr. Address Trap */ - if (user_mode(regs)) { + if (user_mode(®s)) { siginfo.si_signo = SIGILL; siginfo.si_code = ILL_BADIADDR; siginfo.si_errno = 0; siginfo.si_flags = 0; siginfo.si_isr = 0; siginfo.si_imm = 0; - siginfo.si_addr = (void *) (regs->cr_iip + ia64_psr(regs)->ri); + siginfo.si_addr = (void __user *) iip; force_sig_info(SIGILL, &siginfo, current); return; } @@ -598,23 +635,23 @@ ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa, case 45: #ifdef CONFIG_IA32_SUPPORT - if (ia32_exception(regs, isr) == 0) + if (ia32_exception(®s, isr) == 0) return; #endif printk(KERN_ERR "Unexpected IA-32 exception (Trap 45)\n"); printk(KERN_ERR " iip - 0x%lx, ifa - 0x%lx, isr - 0x%lx\n", - regs->cr_iip, ifa, isr); + iip, ifa, isr); force_sig(SIGSEGV, current); break; case 46: #ifdef CONFIG_IA32_SUPPORT - if (ia32_intercept(regs, isr) == 0) + if (ia32_intercept(®s, isr) == 0) return; #endif printk(KERN_ERR "Unexpected IA-32 intercept trap (Trap 46)\n"); printk(KERN_ERR " iip - 0x%lx, ifa - 0x%lx, isr - 0x%lx, iim - 0x%lx\n", - regs->cr_iip, ifa, isr, iim); + iip, ifa, isr, iim); force_sig(SIGSEGV, current); return; @@ -626,6 +663,6 @@ ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa, sprintf(buf, "Fault %lu", vector); break; } - die_if_kernel(buf, regs, error); + die_if_kernel(buf, ®s, error); force_sig(SIGILL, current); }