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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - arch/sh/kernel/traps.c
1 // SPDX-License-Identifier: GPL-2.0
4 #include <linux/types.h>
5 #include <linux/kdebug.h>
6 #include <linux/signal.h>
7 #include <linux/sched.h>
8 #include <linux/sched/debug.h>
9 #include <linux/sched/task_stack.h>
10 #include <linux/uaccess.h>
11 #include <linux/hardirq.h>
12 #include <linux/kernel.h>
13 #include <linux/kexec.h>
14 #include <linux/sched/signal.h>
16 #include <linux/extable.h>
17 #include <linux/module.h> /* print_modules */
18 #include <asm/unwinder.h>
19 #include <asm/traps.h>
21 static DEFINE_SPINLOCK(die_lock
);
23 void die(const char *str
, struct pt_regs
*regs
, long err
)
25 static int die_counter
;
29 spin_lock_irq(&die_lock
);
33 printk("%s: %04lx [#%d]\n", str
, err
& 0xffff, ++die_counter
);
37 printk("Process: %s (pid: %d, stack limit = %p)\n", current
->comm
,
38 task_pid_nr(current
), task_stack_page(current
) + 1);
40 if (!user_mode(regs
) || in_interrupt())
41 dump_mem("Stack: ", KERN_DEFAULT
, regs
->regs
[15],
42 THREAD_SIZE
+ (unsigned long)task_stack_page(current
));
44 notify_die(DIE_OOPS
, str
, regs
, err
, 255, SIGSEGV
);
47 add_taint(TAINT_DIE
, LOCKDEP_NOW_UNRELIABLE
);
48 spin_unlock_irq(&die_lock
);
51 if (kexec_should_crash(current
))
55 panic("Fatal exception in interrupt");
58 panic("Fatal exception");
63 void die_if_kernel(const char *str
, struct pt_regs
*regs
, long err
)
70 * try and fix up kernelspace address errors
71 * - userspace errors just cause EFAULT to be returned, resulting in SEGV
72 * - kernel/userspace interfaces cause a jump to an appropriate handler
73 * - other kernel errors are bad
75 void die_if_no_fixup(const char *str
, struct pt_regs
*regs
, long err
)
77 if (!user_mode(regs
)) {
78 const struct exception_table_entry
*fixup
;
79 fixup
= search_exception_tables(regs
->pc
);
81 regs
->pc
= fixup
->fixup
;
89 #ifdef CONFIG_GENERIC_BUG
90 static void handle_BUG(struct pt_regs
*regs
)
92 const struct bug_entry
*bug
;
93 unsigned long bugaddr
= regs
->pc
;
94 enum bug_trap_type tt
;
96 if (!is_valid_bugaddr(bugaddr
))
99 bug
= find_bug(bugaddr
);
101 /* Switch unwinders when unwind_stack() is called */
102 if (bug
->flags
& BUGFLAG_UNWINDER
)
103 unwinder_faulted
= 1;
105 tt
= report_bug(bugaddr
, regs
);
106 if (tt
== BUG_TRAP_TYPE_WARN
) {
107 regs
->pc
+= instruction_size(bugaddr
);
112 die("Kernel BUG", regs
, TRAPA_BUG_OPCODE
& 0xff);
115 int is_valid_bugaddr(unsigned long addr
)
119 if (addr
< PAGE_OFFSET
)
121 if (get_kernel_nofault(opcode
, (insn_size_t
*)addr
))
123 if (opcode
== TRAPA_BUG_OPCODE
)
131 * Generic trap handler.
133 BUILD_TRAP_HANDLER(debug
)
138 regs
->pc
-= instruction_size(__raw_readw(regs
->pc
- 4));
140 if (notify_die(DIE_TRAP
, "debug trap", regs
, 0, vec
& 0xff,
141 SIGTRAP
) == NOTIFY_STOP
)
148 * Special handler for BUG() traps.
150 BUILD_TRAP_HANDLER(bug
)
155 regs
->pc
-= instruction_size(__raw_readw(regs
->pc
- 4));
157 if (notify_die(DIE_TRAP
, "bug trap", regs
, 0, TRAPA_BUG_OPCODE
& 0xff,
158 SIGTRAP
) == NOTIFY_STOP
)
161 #ifdef CONFIG_GENERIC_BUG
162 if (__kernel_text_address(instruction_pointer(regs
))) {
163 insn_size_t insn
= *(insn_size_t
*)instruction_pointer(regs
);
164 if (insn
== TRAPA_BUG_OPCODE
)
173 #ifdef CONFIG_DYNAMIC_FTRACE
174 extern void arch_ftrace_nmi_enter(void);
175 extern void arch_ftrace_nmi_exit(void);
177 static inline void arch_ftrace_nmi_enter(void) { }
178 static inline void arch_ftrace_nmi_exit(void) { }
181 BUILD_TRAP_HANDLER(nmi
)
183 unsigned int cpu
= smp_processor_id();
186 arch_ftrace_nmi_enter();
191 switch (notify_die(DIE_NMI
, "NMI", regs
, 0, vec
& 0xff, SIGINT
)) {
196 die("Fatal Non-Maskable Interrupt", regs
, SIGINT
);
198 printk(KERN_ALERT
"Got NMI, but nobody cared. Ignoring...\n");
204 arch_ftrace_nmi_exit();