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products/sources/formale Sprachen/C/Linux/lib/ (Open Source Betriebssystem Version 6.17.9^©) Datei vom 24.10.2025 mit Größe 3 kB

Quelle dump_stack.c Sprache: C

// SPDX-License-Identifier: GPL-2.0
/*
* Provide a default dump_stack() function for architectures
* which don't implement their own.
*/

#include <linux/kernel.h>
#include <linux/buildid.h>
#include <linux/export.h>
#include <linux/sched.h>
#include <linux/sched/debug.h>
#include <linux/smp.h>
#include <linux/atomic.h>
#include <linux/kexec.h>
#include <linux/utsname.h>
#include <linux/stop_machine.h>

static char dump_stack_arch_desc_str[128];

/**
* dump_stack_set_arch_desc - set arch-specific str to show with task dumps
* @fmt: printf-style format string
* @...: arguments for the format string
*
* The configured string will be printed right after utsname during task
* dumps.  Usually used to add arch-specific system identifiers.  If an
* arch wants to make use of such an ID string, it should initialize this
* as soon as possible during boot.
*/
void __init dump_stack_set_arch_desc(const char *fmt, ...)
{
va_list args;

va_start(args, fmt);
vsnprintf(dump_stack_arch_desc_str, sizeof(dump_stack_arch_desc_str),
    fmt, args);
va_end(args);
}

#if IS_ENABLED(CONFIG_STACKTRACE_BUILD_ID)
#define BUILD_ID_FMT " %20phN"
#define BUILD_ID_VAL vmlinux_build_id
#else
#define BUILD_ID_FMT "%s"
#define BUILD_ID_VAL ""
#endif

/**
* dump_stack_print_info - print generic debug info for dump_stack()
* @log_lvl: log level
*
* Arch-specific dump_stack() implementations can use this function to
* print out the same debug information as the generic dump_stack().
*/
void dump_stack_print_info(const char *log_lvl)
{
printk("%sCPU: %d UID: %u PID: %d Comm: %.20s %s%s %s %.*s %s " BUILD_ID_FMT "\n",
        log_lvl, raw_smp_processor_id(),
        __kuid_val(current_real_cred()->euid),
        current->pid, current->comm,
        kexec_crash_loaded() ? "Kdump: loaded " : "",
        print_tainted(),
        init_utsname()->release,
        (int)strcspn(init_utsname()->version, " "),
        init_utsname()->version, preempt_model_str(), BUILD_ID_VAL);

if (get_taint())
  printk("%s%s\n", log_lvl, print_tainted_verbose());

if (dump_stack_arch_desc_str[0] != '\0')
  printk("%sHardware name: %s\n",
         log_lvl, dump_stack_arch_desc_str);

print_worker_info(log_lvl, current);
print_stop_info(log_lvl, current);
print_scx_info(log_lvl, current);
}

/**
* show_regs_print_info - print generic debug info for show_regs()
* @log_lvl: log level
*
* show_regs() implementations can use this function to print out generic
* debug information.
*/
void show_regs_print_info(const char *log_lvl)
{
dump_stack_print_info(log_lvl);
}

static void __dump_stack(const char *log_lvl)
{
dump_stack_print_info(log_lvl);
show_stack(NULL, NULL, log_lvl);
}

/**
* dump_stack_lvl - dump the current task information and its stack trace
* @log_lvl: log level
*
* Architectures can override this implementation by implementing its own.
*/
asmlinkage __visible void dump_stack_lvl(const char *log_lvl)
{
bool in_panic = this_cpu_in_panic();
unsigned long flags;

/*
* Permit this cpu to perform nested stack dumps while serialising
* against other CPUs, unless this CPU is in panic.
*
* When in panic, non-panic CPUs are not permitted to store new
* printk messages so there is no need to synchronize the output.
* This avoids potential deadlock in panic() if another CPU is
* holding and unable to release the printk_cpu_sync.
*/
if (!in_panic)
  printk_cpu_sync_get_irqsave(flags);

__dump_stack(log_lvl);

if (!in_panic)
  printk_cpu_sync_put_irqrestore(flags);
}
EXPORT_SYMBOL(dump_stack_lvl);

asmlinkage __visible void dump_stack(void)
{
dump_stack_lvl(KERN_DEFAULT);
}
EXPORT_SYMBOL(dump_stack);

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