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dumpstack_64.c
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/* * Copyright (C) 1991, 1992 Linus Torvalds * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs */ #include <linux/kallsyms.h> #include <linux/kprobes.h> #include <linux/uaccess.h> #include <linux/hardirq.h> #include <linux/kdebug.h> #include <linux/module.h> #include <linux/ptrace.h> #include <linux/kexec.h> #include <linux/sysfs.h> #include <linux/bug.h> #include <linux/nmi.h> #include <asm/stacktrace.h> #define N_EXCEPTION_STACKS_END \ (N_EXCEPTION_STACKS + DEBUG_STKSZ/EXCEPTION_STKSZ - 2) static char x86_stack_ids[][8] = { [ DEBUG_STACK-1 ] = "#DB", [ NMI_STACK-1 ] = "NMI", [ DOUBLEFAULT_STACK-1 ] = "#DF", [ STACKFAULT_STACK-1 ] = "#SS", [ MCE_STACK-1 ] = "#MC", #if DEBUG_STKSZ > EXCEPTION_STKSZ [ N_EXCEPTION_STACKS ... N_EXCEPTION_STACKS_END ] = "#DB[?]" #endif }; static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack, unsigned *usedp, char **idp) { unsigned k; /* * Iterate over all exception stacks, and figure out whether * 'stack' is in one of them: */ for (k = 0; k < N_EXCEPTION_STACKS; k++) { 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. */ if (stack >= end) continue; /* * Is 'stack' above this exception frame's start address? * If yes then we found the right frame. */ if (stack >= end - EXCEPTION_STKSZ) { /* * Make sure we only iterate through an exception * stack once. If it comes up for the second time * then there's something wrong going on - just * break out and return NULL: */ if (*usedp & (1U << k)) break; *usedp |= 1U << k; *idp = x86_stack_ids[k]; return (unsigned long *)end; } /* * If this is a debug stack, and if it has a larger size than * the usual exception stacks, then 'stack' might still * be within the lower portion of the debug stack: */ #if DEBUG_STKSZ > EXCEPTION_STKSZ if (k == DEBUG_STACK - 1 && stack >= end - DEBUG_STKSZ) { unsigned j = N_EXCEPTION_STACKS - 1; /* * Black magic. A large debug stack is composed of * multiple exception stack entries, which we * iterate through now. Dont look: */ do { ++j; end -= EXCEPTION_STKSZ; x86_stack_ids[j][4] = '1' + (j - N_EXCEPTION_STACKS); } while (stack < end - EXCEPTION_STKSZ); if (*usedp & (1U << j)) break; *usedp |= 1U << j; *idp = x86_stack_ids[j]; return (unsigned long *)end; } #endif } return NULL; } static inline int in_irq_stack(unsigned long *stack, unsigned long *irq_stack, unsigned long *irq_stack_end) { return (stack >= irq_stack && stack < irq_stack_end); } /* * We are returning from the irq stack and go to the previous one. * If the previous stack is also in the irq stack, then bp in the first * frame of the irq stack points to the previous, interrupted one. * Otherwise we have another level of indirection: We first save * the bp of the previous stack, then we switch the stack to the irq one * and save a new bp that links to the previous one. * (See save_args()) */ static inline unsigned long fixup_bp_irq_link(unsigned long bp, unsigned long *stack, unsigned long *irq_stack, unsigned long *irq_stack_end) { #ifdef CONFIG_FRAME_POINTER struct stack_frame *frame = (struct stack_frame *)bp; unsigned long next; if (!in_irq_stack(stack, irq_stack, irq_stack_end)) { if (!probe_kernel_address(&frame->next_frame, next)) return next; else WARN_ONCE(1, "Perf: bad frame pointer = %p in " "callchain\n", &frame->next_frame); } #endif return bp; } /* * x86-64 can have up to three kernel stacks: * process stack * interrupt stack * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack */ void dump_trace(struct task_struct *task, struct pt_regs *regs, unsigned long *stack, unsigned long bp, const struct stacktrace_ops *ops, void *data) { const unsigned cpu = get_cpu(); unsigned long *irq_stack_end = (unsigned long *)per_cpu(irq_stack_ptr, cpu); unsigned used = 0; struct thread_info *tinfo; int graph = 0; if (!task) task = current; if (!stack) { unsigned long dummy; stack = &dummy; if (task && task != current) stack = (unsigned long *)task->thread.sp; } #ifdef CONFIG_FRAME_POINTER if (!bp) { if (task == current) { /* Grab bp right from our regs */ get_bp(bp); } else { /* bp is the last reg pushed by switch_to */ bp = *(unsigned long *) task->thread.sp; } } #endif /* * Print function call entries in all stacks, starting at the * current stack address. If the stacks consist of nested * exceptions */ tinfo = task_thread_info(task); for (;;) { char *id; unsigned long *estack_end; estack_end = in_exception_stack(cpu, (unsigned long)stack, &used, &id); if (estack_end) { if (ops->stack(data, id) < 0) break; bp = ops->walk_stack(tinfo, stack, bp, ops, data, estack_end, &graph); ops->stack(data, "<EOE>"); /* * We link to the next stack via the * second-to-last pointer (index -2 to end) in the * exception stack: */ stack = (unsigned long *) estack_end[-2]; continue; } if (irq_stack_end) { unsigned long *irq_stack; irq_stack = irq_stack_end - (IRQ_STACK_SIZE - 64) / sizeof(*irq_stack); if (in_irq_stack(stack, irq_stack, irq_stack_end)) { if (ops->stack(data, "IRQ") < 0) break; bp = ops->walk_stack(tinfo, stack, bp, ops, data, irq_stack_end, &graph); /* * We link to the next stack (which would be * the process stack normally) the last * pointer (index -1 to end) in the IRQ stack: */ stack = (unsigned long *) (irq_stack_end[-1]); bp = fixup_bp_irq_link(bp, stack, irq_stack, irq_stack_end); irq_stack_end = NULL; ops->stack(data, "EOI"); continue; } } break; } /* * This handles the process stack: */ bp = ops->walk_stack(tinfo, stack, bp, ops, data, NULL, &graph); put_cpu(); } EXPORT_SYMBOL(dump_trace); void show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs, unsigned long *sp, unsigned long bp, char *log_lvl) { unsigned long *irq_stack_end; unsigned long *irq_stack; unsigned long *stack; int cpu; int i; preempt_disable(); cpu = smp_processor_id(); irq_stack_end = (unsigned long *)(per_cpu(irq_stack_ptr, cpu)); irq_stack = (unsigned long *)(per_cpu(irq_stack_ptr, cpu) - IRQ_STACK_SIZE); /* * Debugging aid: "show_stack(NULL, NULL);" prints the * back trace for this cpu: */ if (sp == NULL) { if (task) sp = (unsigned long *)task->thread.sp; else sp = (unsigned long *)&sp; } stack = sp; for (i = 0; i < kstack_depth_to_print; i++) { if (stack >= irq_stack && stack <= irq_stack_end) { if (stack == irq_stack_end) { stack = (unsigned long *) (irq_stack_end[-1]); printk(" <EOI> "); } } else { if (((long) stack & (THREAD_SIZE-1)) == 0) break; } if (i && ((i % STACKSLOTS_PER_LINE) == 0)) printk("\n%s", log_lvl); printk(" %016lx", *stack++); touch_nmi_watchdog(); } preempt_enable(); printk("\n"); show_trace_log_lvl(task, regs, sp, bp, log_lvl); } void show_registers(struct pt_regs *regs) { int i; unsigned long sp; const int cpu = smp_processor_id(); struct task_struct *cur = current; sp = regs->sp; printk("CPU %d ", cpu); print_modules(); __show_regs(regs, 1); printk("Process %s (pid: %d, threadinfo %p, task %p)\n", cur->comm, cur->pid, task_thread_info(cur), cur); /* * When in-kernel, we also print out the stack and code at the * time of the fault.. */ if (!user_mode(regs)) { unsigned int code_prologue = code_bytes * 43 / 64; unsigned int code_len = code_bytes; unsigned char c; u8 *ip; printk(KERN_EMERG "Stack:\n"); show_stack_log_lvl(NULL, regs, (unsigned long *)sp, regs->bp, KERN_EMERG); printk(KERN_EMERG "Code: "); ip = (u8 *)regs->ip - code_prologue; if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) { /* try starting at IP */ ip = (u8 *)regs->ip; code_len = code_len - code_prologue + 1; } for (i = 0; i < code_len; i++, ip++) { if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) { printk(" Bad RIP value."); break; } if (ip == (u8 *)regs->ip) printk("<%02x> ", c); else printk("%02x ", c); } } printk("\n"); } int is_valid_bugaddr(unsigned long ip) { unsigned short ud2; if (__copy_from_user(&ud2, (const void __user *) ip, sizeof(ud2))) return 0; return ud2 == 0x0b0f; }
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