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115 lines
3.0 KiB
115 lines
3.0 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Provide a default dump_stack() function for architectures |
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* which don't implement their own. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/buildid.h> |
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#include <linux/export.h> |
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#include <linux/sched.h> |
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#include <linux/sched/debug.h> |
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#include <linux/smp.h> |
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#include <linux/atomic.h> |
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#include <linux/kexec.h> |
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#include <linux/utsname.h> |
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#include <linux/stop_machine.h> |
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static char dump_stack_arch_desc_str[128]; |
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/** |
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* dump_stack_set_arch_desc - set arch-specific str to show with task dumps |
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* @fmt: printf-style format string |
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* @...: arguments for the format string |
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* |
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* The configured string will be printed right after utsname during task |
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* dumps. Usually used to add arch-specific system identifiers. If an |
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* arch wants to make use of such an ID string, it should initialize this |
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* as soon as possible during boot. |
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*/ |
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void __init dump_stack_set_arch_desc(const char *fmt, ...) |
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{ |
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va_list args; |
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va_start(args, fmt); |
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vsnprintf(dump_stack_arch_desc_str, sizeof(dump_stack_arch_desc_str), |
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fmt, args); |
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va_end(args); |
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} |
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#if IS_ENABLED(CONFIG_STACKTRACE_BUILD_ID) |
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#define BUILD_ID_FMT " %20phN" |
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#define BUILD_ID_VAL vmlinux_build_id |
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#else |
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#define BUILD_ID_FMT "%s" |
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#define BUILD_ID_VAL "" |
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#endif |
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/** |
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* dump_stack_print_info - print generic debug info for dump_stack() |
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* @log_lvl: log level |
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* |
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* Arch-specific dump_stack() implementations can use this function to |
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* print out the same debug information as the generic dump_stack(). |
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*/ |
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void dump_stack_print_info(const char *log_lvl) |
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{ |
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printk("%sCPU: %d PID: %d Comm: %.20s %s%s %s %.*s" BUILD_ID_FMT "\n", |
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log_lvl, raw_smp_processor_id(), current->pid, current->comm, |
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kexec_crash_loaded() ? "Kdump: loaded " : "", |
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print_tainted(), |
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init_utsname()->release, |
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(int)strcspn(init_utsname()->version, " "), |
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init_utsname()->version, BUILD_ID_VAL); |
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if (dump_stack_arch_desc_str[0] != '\0') |
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printk("%sHardware name: %s\n", |
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log_lvl, dump_stack_arch_desc_str); |
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print_worker_info(log_lvl, current); |
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print_stop_info(log_lvl, current); |
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} |
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/** |
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* show_regs_print_info - print generic debug info for show_regs() |
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* @log_lvl: log level |
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* |
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* show_regs() implementations can use this function to print out generic |
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* debug information. |
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*/ |
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void show_regs_print_info(const char *log_lvl) |
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{ |
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dump_stack_print_info(log_lvl); |
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} |
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static void __dump_stack(const char *log_lvl) |
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{ |
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dump_stack_print_info(log_lvl); |
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show_stack(NULL, NULL, log_lvl); |
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} |
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/** |
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* dump_stack_lvl - dump the current task information and its stack trace |
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* @log_lvl: log level |
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* |
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* Architectures can override this implementation by implementing its own. |
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*/ |
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asmlinkage __visible void dump_stack_lvl(const char *log_lvl) |
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{ |
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unsigned long flags; |
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/* |
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* Permit this cpu to perform nested stack dumps while serialising |
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* against other CPUs |
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*/ |
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printk_cpu_sync_get_irqsave(flags); |
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__dump_stack(log_lvl); |
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printk_cpu_sync_put_irqrestore(flags); |
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} |
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EXPORT_SYMBOL(dump_stack_lvl); |
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asmlinkage __visible void dump_stack(void) |
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{ |
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dump_stack_lvl(KERN_DEFAULT); |
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} |
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EXPORT_SYMBOL(dump_stack);
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