diff options
Diffstat (limited to 'arch/x86_64/kernel/traps.c')
| -rw-r--r-- | arch/x86_64/kernel/traps.c | 204 |
1 files changed, 131 insertions, 73 deletions
diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c index b1249774d1e8..01f2a8d254c2 100644 --- a/arch/x86_64/kernel/traps.c +++ b/arch/x86_64/kernel/traps.c @@ -45,6 +45,7 @@ #include <asm/pda.h> #include <asm/proto.h> #include <asm/nmi.h> +#include <asm/stacktrace.h> asmlinkage void divide_error(void); asmlinkage void debug(void); @@ -142,7 +143,7 @@ void printk_address(unsigned long address) #endif static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack, - unsigned *usedp, const char **idp) + unsigned *usedp, char **idp) { static char ids[][8] = { [DEBUG_STACK - 1] = "#DB", @@ -161,26 +162,7 @@ static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack, * 'stack' is in one of them: */ for (k = 0; k < N_EXCEPTION_STACKS; k++) { - unsigned long end; - - /* - * set 'end' to the end of the exception stack. - */ - switch (k + 1) { - /* - * TODO: this block is not needed i think, because - * setup64.c:cpu_init() sets up t->ist[DEBUG_STACK] - * properly too. - */ -#if DEBUG_STKSZ > EXCEPTION_STKSZ - case DEBUG_STACK: - end = cpu_pda(cpu)->debugstack + DEBUG_STKSZ; - break; -#endif - default: - end = per_cpu(orig_ist, cpu).ist[k]; - break; - } + unsigned long end = per_cpu(orig_ist, cpu).ist[k]; /* * Is 'stack' above this exception frame's end? * If yes then skip to the next frame. @@ -234,13 +216,19 @@ static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack, return NULL; } -static int show_trace_unwind(struct unwind_frame_info *info, void *context) +struct ops_and_data { + struct stacktrace_ops *ops; + void *data; +}; + +static int dump_trace_unwind(struct unwind_frame_info *info, void *context) { + struct ops_and_data *oad = (struct ops_and_data *)context; int n = 0; while (unwind(info) == 0 && UNW_PC(info)) { n++; - printk_address(UNW_PC(info)); + oad->ops->address(oad->data, UNW_PC(info)); if (arch_unw_user_mode(info)) break; } @@ -254,45 +242,53 @@ static int show_trace_unwind(struct unwind_frame_info *info, void *context) * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack */ -void show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long * stack) +void dump_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long * stack, + struct stacktrace_ops *ops, void *data) { - const unsigned cpu = safe_smp_processor_id(); + const unsigned cpu = smp_processor_id(); unsigned long *irqstack_end = (unsigned long *)cpu_pda(cpu)->irqstackptr; unsigned used = 0; - printk("\nCall Trace:\n"); - if (!tsk) tsk = current; if (call_trace >= 0) { int unw_ret = 0; struct unwind_frame_info info; + struct ops_and_data oad = { .ops = ops, .data = data }; if (regs) { if (unwind_init_frame_info(&info, tsk, regs) == 0) - unw_ret = show_trace_unwind(&info, NULL); + unw_ret = dump_trace_unwind(&info, &oad); } else if (tsk == current) - unw_ret = unwind_init_running(&info, show_trace_unwind, NULL); + unw_ret = unwind_init_running(&info, dump_trace_unwind, &oad); else { if (unwind_init_blocked(&info, tsk) == 0) - unw_ret = show_trace_unwind(&info, NULL); + unw_ret = dump_trace_unwind(&info, &oad); } if (unw_ret > 0) { if (call_trace == 1 && !arch_unw_user_mode(&info)) { - print_symbol("DWARF2 unwinder stuck at %s\n", + ops->warning_symbol(data, "DWARF2 unwinder stuck at %s\n", UNW_PC(&info)); if ((long)UNW_SP(&info) < 0) { - printk("Leftover inexact backtrace:\n"); + ops->warning(data, "Leftover inexact backtrace:\n"); stack = (unsigned long *)UNW_SP(&info); + if (!stack) + return; } else - printk("Full inexact backtrace again:\n"); + ops->warning(data, "Full inexact backtrace again:\n"); } else if (call_trace >= 1) return; else - printk("Full inexact backtrace again:\n"); + ops->warning(data, "Full inexact backtrace again:\n"); } else - printk("Inexact backtrace:\n"); + ops->warning(data, "Inexact backtrace:\n"); + } + if (!stack) { + unsigned long dummy; + stack = &dummy; + if (tsk && tsk != current) + stack = (unsigned long *)tsk->thread.rsp; } /* @@ -303,7 +299,9 @@ void show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long * s #define HANDLE_STACK(cond) \ do while (cond) { \ unsigned long addr = *stack++; \ - if (kernel_text_address(addr)) { \ + if (oops_in_progress ? \ + __kernel_text_address(addr) : \ + kernel_text_address(addr)) { \ /* \ * If the address is either in the text segment of the \ * kernel, or in the region which contains vmalloc'ed \ @@ -312,7 +310,7 @@ void show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long * s * down the cause of the crash will be able to figure \ * out the call path that was taken. \ */ \ - printk_address(addr); \ + ops->address(data, addr); \ } \ } while (0) @@ -321,16 +319,17 @@ void show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long * s * current stack address. If the stacks consist of nested * exceptions */ - for ( ; ; ) { - const char *id; + for (;;) { + char *id; unsigned long *estack_end; estack_end = in_exception_stack(cpu, (unsigned long)stack, &used, &id); if (estack_end) { - printk(" <%s>", id); + if (ops->stack(data, id) < 0) + break; HANDLE_STACK (stack < estack_end); - printk(" <EOE>"); + ops->stack(data, "<EOE>"); /* * We link to the next stack via the * second-to-last pointer (index -2 to end) in the @@ -345,7 +344,8 @@ void show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long * s (IRQSTACKSIZE - 64) / sizeof(*irqstack); if (stack >= irqstack && stack < irqstack_end) { - printk(" <IRQ>"); + if (ops->stack(data, "IRQ") < 0) + break; HANDLE_STACK (stack < irqstack_end); /* * We link to the next stack (which would be @@ -354,7 +354,7 @@ void show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long * s */ stack = (unsigned long *) (irqstack_end[-1]); irqstack_end = NULL; - printk(" <EOI>"); + ops->stack(data, "EOI"); continue; } } @@ -362,19 +362,57 @@ void show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long * s } /* - * This prints the process stack: + * This handles the process stack: */ HANDLE_STACK (((long) stack & (THREAD_SIZE-1)) != 0); #undef HANDLE_STACK +} +EXPORT_SYMBOL(dump_trace); + +static void +print_trace_warning_symbol(void *data, char *msg, unsigned long symbol) +{ + print_symbol(msg, symbol); + printk("\n"); +} + +static void print_trace_warning(void *data, char *msg) +{ + printk("%s\n", msg); +} + +static int print_trace_stack(void *data, char *name) +{ + printk(" <%s> ", name); + return 0; +} + +static void print_trace_address(void *data, unsigned long addr) +{ + printk_address(addr); +} + +static struct stacktrace_ops print_trace_ops = { + .warning = print_trace_warning, + .warning_symbol = print_trace_warning_symbol, + .stack = print_trace_stack, + .address = print_trace_address, +}; +void +show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long *stack) +{ + printk("\nCall Trace:\n"); + dump_trace(tsk, regs, stack, &print_trace_ops, NULL); printk("\n"); } -static void _show_stack(struct task_struct *tsk, struct pt_regs *regs, unsigned long * rsp) +static void +_show_stack(struct task_struct *tsk, struct pt_regs *regs, unsigned long *rsp) { unsigned long *stack; int i; - const int cpu = safe_smp_processor_id(); + const int cpu = smp_processor_id(); unsigned long *irqstack_end = (unsigned long *) (cpu_pda(cpu)->irqstackptr); unsigned long *irqstack = (unsigned long *) (cpu_pda(cpu)->irqstackptr - IRQSTACKSIZE); @@ -428,7 +466,7 @@ void show_registers(struct pt_regs *regs) int i; int in_kernel = !user_mode(regs); unsigned long rsp; - const int cpu = safe_smp_processor_id(); + const int cpu = smp_processor_id(); struct task_struct *cur = cpu_pda(cpu)->pcurrent; rsp = regs->rsp; @@ -503,9 +541,11 @@ static unsigned int die_nest_count; unsigned __kprobes long oops_begin(void) { - int cpu = safe_smp_processor_id(); + int cpu = smp_processor_id(); unsigned long flags; + oops_enter(); + /* racy, but better than risking deadlock. */ local_irq_save(flags); if (!spin_trylock(&die_lock)) { @@ -534,6 +574,7 @@ void __kprobes oops_end(unsigned long flags) spin_unlock_irqrestore(&die_lock, flags); if (panic_on_oops) panic("Fatal exception"); + oops_exit(); } void __kprobes __die(const char * str, struct pt_regs * regs, long err) @@ -570,7 +611,7 @@ void die(const char * str, struct pt_regs * regs, long err) do_exit(SIGSEGV); } -void __kprobes die_nmi(char *str, struct pt_regs *regs) +void __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic) { unsigned long flags = oops_begin(); @@ -578,13 +619,12 @@ void __kprobes die_nmi(char *str, struct pt_regs *regs) * We are in trouble anyway, lets at least try * to get a message out. */ - printk(str, safe_smp_processor_id()); + printk(str, smp_processor_id()); show_registers(regs); if (kexec_should_crash(current)) crash_kexec(regs); - if (panic_on_timeout || panic_on_oops) - panic("nmi watchdog"); - printk("console shuts up ...\n"); + if (do_panic || panic_on_oops) + panic("Non maskable interrupt"); oops_end(flags); nmi_exit(); local_irq_enable(); @@ -730,8 +770,15 @@ asmlinkage void __kprobes do_general_protection(struct pt_regs * regs, static __kprobes void mem_parity_error(unsigned char reason, struct pt_regs * regs) { - printk("Uhhuh. NMI received. Dazed and confused, but trying to continue\n"); - printk("You probably have a hardware problem with your RAM chips\n"); + printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", + reason); + printk(KERN_EMERG "You probably have a hardware problem with your " + "RAM chips\n"); + + if (panic_on_unrecovered_nmi) + panic("NMI: Not continuing"); + + printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); /* Clear and disable the memory parity error line. */ reason = (reason & 0xf) | 4; @@ -754,9 +801,15 @@ io_check_error(unsigned char reason, struct pt_regs * regs) static __kprobes void unknown_nmi_error(unsigned char reason, struct pt_regs * regs) -{ printk("Uhhuh. NMI received for unknown reason %02x.\n", reason); - printk("Dazed and confused, but trying to continue\n"); - printk("Do you have a strange power saving mode enabled?\n"); +{ + printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", + reason); + printk(KERN_EMERG "Do you have a strange power saving mode enabled?\n"); + + if (panic_on_unrecovered_nmi) + panic("NMI: Not continuing"); + + printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); } /* Runs on IST stack. This code must keep interrupts off all the time. @@ -776,17 +829,15 @@ asmlinkage __kprobes void default_do_nmi(struct pt_regs *regs) if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT) == NOTIFY_STOP) return; -#ifdef CONFIG_X86_LOCAL_APIC /* * Ok, so this is none of the documented NMI sources, * so it must be the NMI watchdog. */ - if (nmi_watchdog > 0) { - nmi_watchdog_tick(regs,reason); + if (nmi_watchdog_tick(regs,reason)) return; - } -#endif - unknown_nmi_error(reason, regs); + if (!do_nmi_callback(regs,cpu)) + unknown_nmi_error(reason, regs); + return; } if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP) @@ -1071,6 +1122,7 @@ asmlinkage void math_state_restore(void) init_fpu(me); restore_fpu_checking(&me->thread.i387.fxsave); task_thread_info(me)->status |= TS_USEDFPU; + me->fpu_counter++; } void __init trap_init(void) @@ -1109,24 +1161,30 @@ void __init trap_init(void) } -/* Actual parsing is done early in setup.c. */ -static int __init oops_dummy(char *s) +static int __init oops_setup(char *s) { - panic_on_oops = 1; - return 1; + if (!s) + return -EINVAL; + if (!strcmp(s, "panic")) + panic_on_oops = 1; + return 0; } -__setup("oops=", oops_dummy); +early_param("oops", oops_setup); static int __init kstack_setup(char *s) { + if (!s) + return -EINVAL; kstack_depth_to_print = simple_strtoul(s,NULL,0); - return 1; + return 0; } -__setup("kstack=", kstack_setup); +early_param("kstack", kstack_setup); #ifdef CONFIG_STACK_UNWIND static int __init call_trace_setup(char *s) { + if (!s) + return -EINVAL; if (strcmp(s, "old") == 0) call_trace = -1; else if (strcmp(s, "both") == 0) @@ -1135,7 +1193,7 @@ static int __init call_trace_setup(char *s) call_trace = 1; else if (strcmp(s, "new") == 0) call_trace = 2; - return 1; + return 0; } -__setup("call_trace=", call_trace_setup); +early_param("call_trace", call_trace_setup); #endif |