![Josh Poimboeuf](/assets/img/avatar_default.png)
All previous users of dump_trace() have been converted to use the new unwind interfaces, so we can remove it and the related print_context_stack() and print_context_stack_bp() callback functions. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Byungchul Park <byungchul.park@lge.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Nilay Vaish <nilayvaish@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/5b97da3572b40b5a4d8e185cf2429308d0987a13.1474045023.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
245 lines
5.3 KiB
C
245 lines
5.3 KiB
C
/*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
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*/
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#include <linux/kallsyms.h>
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#include <linux/kprobes.h>
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#include <linux/uaccess.h>
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#include <linux/hardirq.h>
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#include <linux/kdebug.h>
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#include <linux/export.h>
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#include <linux/ptrace.h>
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#include <linux/kexec.h>
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#include <linux/sysfs.h>
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#include <linux/bug.h>
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#include <linux/nmi.h>
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#include <asm/stacktrace.h>
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static char *exception_stack_names[N_EXCEPTION_STACKS] = {
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[ DOUBLEFAULT_STACK-1 ] = "#DF",
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[ NMI_STACK-1 ] = "NMI",
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[ DEBUG_STACK-1 ] = "#DB",
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[ MCE_STACK-1 ] = "#MC",
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};
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static unsigned long exception_stack_sizes[N_EXCEPTION_STACKS] = {
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[0 ... N_EXCEPTION_STACKS - 1] = EXCEPTION_STKSZ,
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[DEBUG_STACK - 1] = DEBUG_STKSZ
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};
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void stack_type_str(enum stack_type type, const char **begin, const char **end)
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{
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BUILD_BUG_ON(N_EXCEPTION_STACKS != 4);
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switch (type) {
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case STACK_TYPE_IRQ:
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*begin = "IRQ";
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*end = "EOI";
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break;
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case STACK_TYPE_EXCEPTION ... STACK_TYPE_EXCEPTION_LAST:
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*begin = exception_stack_names[type - STACK_TYPE_EXCEPTION];
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*end = "EOE";
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break;
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default:
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*begin = NULL;
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*end = NULL;
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}
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}
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static bool in_exception_stack(unsigned long *stack, struct stack_info *info)
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{
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unsigned long *begin, *end;
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struct pt_regs *regs;
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unsigned k;
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BUILD_BUG_ON(N_EXCEPTION_STACKS != 4);
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for (k = 0; k < N_EXCEPTION_STACKS; k++) {
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end = (unsigned long *)raw_cpu_ptr(&orig_ist)->ist[k];
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begin = end - (exception_stack_sizes[k] / sizeof(long));
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regs = (struct pt_regs *)end - 1;
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if (stack < begin || stack >= end)
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continue;
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info->type = STACK_TYPE_EXCEPTION + k;
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info->begin = begin;
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info->end = end;
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info->next_sp = (unsigned long *)regs->sp;
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return true;
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}
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return false;
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}
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static bool in_irq_stack(unsigned long *stack, struct stack_info *info)
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{
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unsigned long *end = (unsigned long *)this_cpu_read(irq_stack_ptr);
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unsigned long *begin = end - (IRQ_STACK_SIZE / sizeof(long));
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/*
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* This is a software stack, so 'end' can be a valid stack pointer.
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* It just means the stack is empty.
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*/
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if (stack < begin || stack > end)
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return false;
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info->type = STACK_TYPE_IRQ;
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info->begin = begin;
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info->end = end;
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/*
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* The next stack pointer is the first thing pushed by the entry code
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* after switching to the irq stack.
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*/
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info->next_sp = (unsigned long *)*(end - 1);
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return true;
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}
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int get_stack_info(unsigned long *stack, struct task_struct *task,
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struct stack_info *info, unsigned long *visit_mask)
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{
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if (!stack)
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goto unknown;
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task = task ? : current;
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if (in_task_stack(stack, task, info))
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goto recursion_check;
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if (task != current)
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goto unknown;
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if (in_exception_stack(stack, info))
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goto recursion_check;
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if (in_irq_stack(stack, info))
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goto recursion_check;
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goto unknown;
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recursion_check:
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/*
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* Make sure we don't iterate through any given stack more than once.
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* If it comes up a second time then there's something wrong going on:
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* just break out and report an unknown stack type.
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*/
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if (visit_mask) {
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if (*visit_mask & (1UL << info->type))
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goto unknown;
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*visit_mask |= 1UL << info->type;
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}
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return 0;
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unknown:
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info->type = STACK_TYPE_UNKNOWN;
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return -EINVAL;
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}
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void show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
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unsigned long *sp, char *log_lvl)
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{
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unsigned long *irq_stack_end;
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unsigned long *irq_stack;
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unsigned long *stack;
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int i;
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if (!try_get_task_stack(task))
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return;
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irq_stack_end = (unsigned long *)this_cpu_read(irq_stack_ptr);
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irq_stack = irq_stack_end - (IRQ_STACK_SIZE / sizeof(long));
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sp = sp ? : get_stack_pointer(task, regs);
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stack = sp;
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for (i = 0; i < kstack_depth_to_print; i++) {
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unsigned long word;
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if (stack >= irq_stack && stack <= irq_stack_end) {
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if (stack == irq_stack_end) {
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stack = (unsigned long *) (irq_stack_end[-1]);
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pr_cont(" <EOI> ");
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}
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} else {
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if (kstack_end(stack))
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break;
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}
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if (probe_kernel_address(stack, word))
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break;
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if ((i % STACKSLOTS_PER_LINE) == 0) {
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if (i != 0)
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pr_cont("\n");
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printk("%s %016lx", log_lvl, word);
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} else
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pr_cont(" %016lx", word);
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stack++;
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touch_nmi_watchdog();
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}
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pr_cont("\n");
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show_trace_log_lvl(task, regs, sp, log_lvl);
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put_task_stack(task);
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}
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void show_regs(struct pt_regs *regs)
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{
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int i;
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show_regs_print_info(KERN_DEFAULT);
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__show_regs(regs, 1);
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/*
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* When in-kernel, we also print out the stack and code at the
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* time of the fault..
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*/
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if (!user_mode(regs)) {
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unsigned int code_prologue = code_bytes * 43 / 64;
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unsigned int code_len = code_bytes;
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unsigned char c;
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u8 *ip;
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printk(KERN_DEFAULT "Stack:\n");
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show_stack_log_lvl(current, regs, NULL, KERN_DEFAULT);
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printk(KERN_DEFAULT "Code: ");
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ip = (u8 *)regs->ip - code_prologue;
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if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) {
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/* try starting at IP */
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ip = (u8 *)regs->ip;
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code_len = code_len - code_prologue + 1;
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}
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for (i = 0; i < code_len; i++, ip++) {
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if (ip < (u8 *)PAGE_OFFSET ||
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probe_kernel_address(ip, c)) {
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pr_cont(" Bad RIP value.");
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break;
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}
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if (ip == (u8 *)regs->ip)
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pr_cont("<%02x> ", c);
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else
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pr_cont("%02x ", c);
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}
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}
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pr_cont("\n");
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}
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int is_valid_bugaddr(unsigned long ip)
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{
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unsigned short ud2;
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if (__copy_from_user(&ud2, (const void __user *) ip, sizeof(ud2)))
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return 0;
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return ud2 == 0x0b0f;
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}
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