cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

dump_stack.c (3110B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Provide a default dump_stack() function for architectures
      4 * which don't implement their own.
      5 */
      6
      7#include <linux/kernel.h>
      8#include <linux/buildid.h>
      9#include <linux/export.h>
     10#include <linux/sched.h>
     11#include <linux/sched/debug.h>
     12#include <linux/smp.h>
     13#include <linux/atomic.h>
     14#include <linux/kexec.h>
     15#include <linux/utsname.h>
     16#include <linux/stop_machine.h>
     17
     18static char dump_stack_arch_desc_str[128];
     19
     20/**
     21 * dump_stack_set_arch_desc - set arch-specific str to show with task dumps
     22 * @fmt: printf-style format string
     23 * @...: arguments for the format string
     24 *
     25 * The configured string will be printed right after utsname during task
     26 * dumps.  Usually used to add arch-specific system identifiers.  If an
     27 * arch wants to make use of such an ID string, it should initialize this
     28 * as soon as possible during boot.
     29 */
     30void __init dump_stack_set_arch_desc(const char *fmt, ...)
     31{
     32	va_list args;
     33
     34	va_start(args, fmt);
     35	vsnprintf(dump_stack_arch_desc_str, sizeof(dump_stack_arch_desc_str),
     36		  fmt, args);
     37	va_end(args);
     38}
     39
     40#if IS_ENABLED(CONFIG_STACKTRACE_BUILD_ID)
     41#define BUILD_ID_FMT " %20phN"
     42#define BUILD_ID_VAL vmlinux_build_id
     43#else
     44#define BUILD_ID_FMT "%s"
     45#define BUILD_ID_VAL ""
     46#endif
     47
     48/**
     49 * dump_stack_print_info - print generic debug info for dump_stack()
     50 * @log_lvl: log level
     51 *
     52 * Arch-specific dump_stack() implementations can use this function to
     53 * print out the same debug information as the generic dump_stack().
     54 */
     55void dump_stack_print_info(const char *log_lvl)
     56{
     57	printk("%sCPU: %d PID: %d Comm: %.20s %s%s %s %.*s" BUILD_ID_FMT "\n",
     58	       log_lvl, raw_smp_processor_id(), current->pid, current->comm,
     59	       kexec_crash_loaded() ? "Kdump: loaded " : "",
     60	       print_tainted(),
     61	       init_utsname()->release,
     62	       (int)strcspn(init_utsname()->version, " "),
     63	       init_utsname()->version, BUILD_ID_VAL);
     64
     65	if (dump_stack_arch_desc_str[0] != '\0')
     66		printk("%sHardware name: %s\n",
     67		       log_lvl, dump_stack_arch_desc_str);
     68
     69	print_worker_info(log_lvl, current);
     70	print_stop_info(log_lvl, current);
     71}
     72
     73/**
     74 * show_regs_print_info - print generic debug info for show_regs()
     75 * @log_lvl: log level
     76 *
     77 * show_regs() implementations can use this function to print out generic
     78 * debug information.
     79 */
     80void show_regs_print_info(const char *log_lvl)
     81{
     82	dump_stack_print_info(log_lvl);
     83}
     84
     85static void __dump_stack(const char *log_lvl)
     86{
     87	dump_stack_print_info(log_lvl);
     88	show_stack(NULL, NULL, log_lvl);
     89}
     90
     91/**
     92 * dump_stack_lvl - dump the current task information and its stack trace
     93 * @log_lvl: log level
     94 *
     95 * Architectures can override this implementation by implementing its own.
     96 */
     97asmlinkage __visible void dump_stack_lvl(const char *log_lvl)
     98{
     99	unsigned long flags;
    100
    101	/*
    102	 * Permit this cpu to perform nested stack dumps while serialising
    103	 * against other CPUs
    104	 */
    105	printk_cpu_sync_get_irqsave(flags);
    106	__dump_stack(log_lvl);
    107	printk_cpu_sync_put_irqrestore(flags);
    108}
    109EXPORT_SYMBOL(dump_stack_lvl);
    110
    111asmlinkage __visible void dump_stack(void)
    112{
    113	dump_stack_lvl(KERN_DEFAULT);
    114}
    115EXPORT_SYMBOL(dump_stack);