include/linux/panic.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_PANIC_H
   3 #define _LINUX_PANIC_H
   4
   5 #include <linux/compiler_attributes.h>
   6 #include <linux/stdarg.h>
   7 #include <linux/types.h>
   8
   9 struct pt_regs;
  10
  11 extern long (*panic_blink)(int state);
  12 __printf(1, 2)
  13 void panic(const char *fmt, ...) __noreturn __cold;
  14 __printf(1, 0)
  15 void vpanic(const char *fmt, va_list args) __noreturn __cold;
  16 void nmi_panic(struct pt_regs *regs, const char *msg);
  17 void check_panic_on_warn(const char *origin);
  18 extern void oops_enter(void);
  19 extern void oops_exit(void);
  20 extern bool oops_may_print(void);
  21
  22 extern bool panic_triggering_all_cpu_backtrace;
  23 extern int panic_timeout;
  24 extern unsigned long panic_print;
  25 extern int panic_on_oops;
  26 extern int panic_on_warn;
  27
  28 extern unsigned long panic_on_taint;
  29 extern bool panic_on_taint_nousertaint;
  30
  31 extern int sysctl_panic_on_stackoverflow;
  32
  33 extern bool crash_kexec_post_notifiers;
  34
  35 extern void __stack_chk_fail(void);
  36 void abort(void);
  37
  38 /*
  39  * panic_cpu is used for synchronizing panic() and crash_kexec() execution. It
  40  * holds a CPU number which is executing panic() currently. A value of
  41  * PANIC_CPU_INVALID means no CPU has entered panic() or crash_kexec().
  42  */
  43 extern atomic_t panic_cpu;
  44
  45 /*
  46  * panic_redirect_cpu is used when panic is redirected to a specific CPU via
  47  * the panic_force_cpu= boot parameter. It holds the CPU number that originally
  48  * triggered the panic before redirection. A value of PANIC_CPU_INVALID means
  49  * no redirection has occurred.
  50  */
  51 extern atomic_t panic_redirect_cpu;
  52 #define PANIC_CPU_INVALID       -1
  53
  54 bool panic_try_start(void);
  55 void panic_reset(void);
  56 bool panic_in_progress(void);
  57 bool panic_on_this_cpu(void);
  58 bool panic_on_other_cpu(void);
  59
  60 /*
  61  * Only to be used by arch init code. If the user over-wrote the default
  62  * CONFIG_PANIC_TIMEOUT, honor it.
  63  */
  64 static inline void set_arch_panic_timeout(int timeout, int arch_default_timeout)
  65 {
  66         if (panic_timeout == arch_default_timeout)
  67                 panic_timeout = timeout;
  68 }
  69
  70 /* This cannot be an enum because some may be used in assembly source. */
  71 #define TAINT_PROPRIETARY_MODULE        0
  72 #define TAINT_FORCED_MODULE             1
  73 #define TAINT_CPU_OUT_OF_SPEC           2
  74 #define TAINT_FORCED_RMMOD              3
  75 #define TAINT_MACHINE_CHECK             4
  76 #define TAINT_BAD_PAGE                  5
  77 #define TAINT_USER                      6
  78 #define TAINT_DIE                       7
  79 #define TAINT_OVERRIDDEN_ACPI_TABLE     8
  80 #define TAINT_WARN                      9
  81 #define TAINT_CRAP                      10
  82 #define TAINT_FIRMWARE_WORKAROUND       11
  83 #define TAINT_OOT_MODULE                12
  84 #define TAINT_UNSIGNED_MODULE           13
  85 #define TAINT_SOFTLOCKUP                14
  86 #define TAINT_LIVEPATCH                 15
  87 #define TAINT_AUX                       16
  88 #define TAINT_RANDSTRUCT                17
  89 #define TAINT_TEST                      18
  90 #define TAINT_FWCTL                     19
  91 #define TAINT_FLAGS_COUNT               20
  92 #define TAINT_FLAGS_MAX                 ((1UL << TAINT_FLAGS_COUNT) - 1)
  93
  94 struct taint_flag {
  95         char c_true;            /* character printed when tainted */
  96         char c_false;           /* character printed when not tainted */
  97         const char *desc;       /* verbose description of the set taint flag */
  98 };
  99
 100 extern const struct taint_flag taint_flags[TAINT_FLAGS_COUNT];
 101
 102 enum lockdep_ok {
 103         LOCKDEP_STILL_OK,
 104         LOCKDEP_NOW_UNRELIABLE,
 105 };
 106
 107 extern const char *print_tainted(void);
 108 extern const char *print_tainted_verbose(void);
 109 extern void add_taint(unsigned flag, enum lockdep_ok);
 110 extern int test_taint(unsigned flag);
 111 extern unsigned long get_taint(void);
 112
 113 #endif  /* _LINUX_PANIC_H */