^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) #include <linux/bug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <linux/kdebug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/sched/debug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/hardirq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/kexec.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/sched/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/extable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/module.h> /* print_modules */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <asm/unwinder.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <asm/traps.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) static DEFINE_SPINLOCK(die_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) void die(const char *str, struct pt_regs *regs, long err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static int die_counter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) oops_enter();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) spin_lock_irq(&die_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) console_verbose();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) bust_spinlocks(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) printk("%s: %04lx [#%d]\n", str, err & 0xffff, ++die_counter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) print_modules();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) show_regs(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) printk("Process: %s (pid: %d, stack limit = %p)\n", current->comm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) task_pid_nr(current), task_stack_page(current) + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) if (!user_mode(regs) || in_interrupt())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) dump_mem("Stack: ", KERN_DEFAULT, regs->regs[15],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) THREAD_SIZE + (unsigned long)task_stack_page(current));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) notify_die(DIE_OOPS, str, regs, err, 255, SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) bust_spinlocks(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) spin_unlock_irq(&die_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) oops_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) if (kexec_should_crash(current))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) crash_kexec(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (in_interrupt())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) panic("Fatal exception in interrupt");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) if (panic_on_oops)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) panic("Fatal exception");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) do_exit(SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) void die_if_kernel(const char *str, struct pt_regs *regs, long err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) if (!user_mode(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) die(str, regs, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * try and fix up kernelspace address errors
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * - userspace errors just cause EFAULT to be returned, resulting in SEGV
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * - kernel/userspace interfaces cause a jump to an appropriate handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * - other kernel errors are bad
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) void die_if_no_fixup(const char *str, struct pt_regs *regs, long err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (!user_mode(regs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) const struct exception_table_entry *fixup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) fixup = search_exception_tables(regs->pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) if (fixup) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) regs->pc = fixup->fixup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) die(str, regs, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) #ifdef CONFIG_GENERIC_BUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) static void handle_BUG(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) const struct bug_entry *bug;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) unsigned long bugaddr = regs->pc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) enum bug_trap_type tt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (!is_valid_bugaddr(bugaddr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) goto invalid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) bug = find_bug(bugaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) /* Switch unwinders when unwind_stack() is called */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (bug->flags & BUGFLAG_UNWINDER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) unwinder_faulted = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) tt = report_bug(bugaddr, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) if (tt == BUG_TRAP_TYPE_WARN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) regs->pc += instruction_size(bugaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) invalid:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) die("Kernel BUG", regs, TRAPA_BUG_OPCODE & 0xff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) int is_valid_bugaddr(unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) insn_size_t opcode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (addr < PAGE_OFFSET)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) if (get_kernel_nofault(opcode, (insn_size_t *)addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (opcode == TRAPA_BUG_OPCODE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) * Generic trap handler.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) BUILD_TRAP_HANDLER(debug)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) TRAP_HANDLER_DECL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) /* Rewind */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) regs->pc -= instruction_size(__raw_readw(regs->pc - 4));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) if (notify_die(DIE_TRAP, "debug trap", regs, 0, vec & 0xff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) SIGTRAP) == NOTIFY_STOP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) force_sig(SIGTRAP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) * Special handler for BUG() traps.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) BUILD_TRAP_HANDLER(bug)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) TRAP_HANDLER_DECL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) /* Rewind */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) regs->pc -= instruction_size(__raw_readw(regs->pc - 4));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) if (notify_die(DIE_TRAP, "bug trap", regs, 0, TRAPA_BUG_OPCODE & 0xff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) SIGTRAP) == NOTIFY_STOP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) #ifdef CONFIG_GENERIC_BUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) if (__kernel_text_address(instruction_pointer(regs))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) insn_size_t insn = *(insn_size_t *)instruction_pointer(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) if (insn == TRAPA_BUG_OPCODE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) handle_BUG(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) force_sig(SIGTRAP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) #ifdef CONFIG_DYNAMIC_FTRACE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) extern void arch_ftrace_nmi_enter(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) extern void arch_ftrace_nmi_exit(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) static inline void arch_ftrace_nmi_enter(void) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) static inline void arch_ftrace_nmi_exit(void) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) BUILD_TRAP_HANDLER(nmi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) unsigned int cpu = smp_processor_id();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) TRAP_HANDLER_DECL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) arch_ftrace_nmi_enter();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) nmi_enter();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) nmi_count(cpu)++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) switch (notify_die(DIE_NMI, "NMI", regs, 0, vec & 0xff, SIGINT)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) case NOTIFY_OK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) case NOTIFY_STOP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) case NOTIFY_BAD:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) die("Fatal Non-Maskable Interrupt", regs, SIGINT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) printk(KERN_ALERT "Got NMI, but nobody cared. Ignoring...\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) nmi_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) arch_ftrace_nmi_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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