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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - arch/sh/kernel/traps.c
3 #include <linux/types.h>
4 #include <linux/kdebug.h>
5 #include <linux/signal.h>
6 #include <linux/sched.h>
7 #include <linux/sched/debug.h>
8 #include <linux/sched/task_stack.h>
9 #include <linux/uaccess.h>
10 #include <linux/hardirq.h>
11 #include <linux/kernel.h>
12 #include <linux/kexec.h>
13 #include <linux/sched/signal.h>
15 #include <linux/extable.h>
16 #include <linux/module.h> /* print_modules */
17 #include <asm/unwinder.h>
18 #include <asm/traps.h>
20 static DEFINE_SPINLOCK(die_lock
);
22 void die(const char *str
, struct pt_regs
*regs
, long err
)
24 static int die_counter
;
28 spin_lock_irq(&die_lock
);
32 printk("%s: %04lx [#%d]\n", str
, err
& 0xffff, ++die_counter
);
36 printk("Process: %s (pid: %d, stack limit = %p)\n", current
->comm
,
37 task_pid_nr(current
), task_stack_page(current
) + 1);
39 if (!user_mode(regs
) || in_interrupt())
40 dump_mem("Stack: ", regs
->regs
[15], THREAD_SIZE
+
41 (unsigned long)task_stack_page(current
));
43 notify_die(DIE_OOPS
, str
, regs
, err
, 255, SIGSEGV
);
46 add_taint(TAINT_DIE
, LOCKDEP_NOW_UNRELIABLE
);
47 spin_unlock_irq(&die_lock
);
50 if (kexec_should_crash(current
))
54 panic("Fatal exception in interrupt");
57 panic("Fatal exception");
62 void die_if_kernel(const char *str
, struct pt_regs
*regs
, long err
)
69 * try and fix up kernelspace address errors
70 * - userspace errors just cause EFAULT to be returned, resulting in SEGV
71 * - kernel/userspace interfaces cause a jump to an appropriate handler
72 * - other kernel errors are bad
74 void die_if_no_fixup(const char *str
, struct pt_regs
*regs
, long err
)
76 if (!user_mode(regs
)) {
77 const struct exception_table_entry
*fixup
;
78 fixup
= search_exception_tables(regs
->pc
);
80 regs
->pc
= fixup
->fixup
;
88 #ifdef CONFIG_GENERIC_BUG
89 static void handle_BUG(struct pt_regs
*regs
)
91 const struct bug_entry
*bug
;
92 unsigned long bugaddr
= regs
->pc
;
93 enum bug_trap_type tt
;
95 if (!is_valid_bugaddr(bugaddr
))
98 bug
= find_bug(bugaddr
);
100 /* Switch unwinders when unwind_stack() is called */
101 if (bug
->flags
& BUGFLAG_UNWINDER
)
102 unwinder_faulted
= 1;
104 tt
= report_bug(bugaddr
, regs
);
105 if (tt
== BUG_TRAP_TYPE_WARN
) {
106 regs
->pc
+= instruction_size(bugaddr
);
111 die("Kernel BUG", regs
, TRAPA_BUG_OPCODE
& 0xff);
114 int is_valid_bugaddr(unsigned long addr
)
118 if (addr
< PAGE_OFFSET
)
120 if (probe_kernel_address((insn_size_t
*)addr
, opcode
))
122 if (opcode
== TRAPA_BUG_OPCODE
)
130 * Generic trap handler.
132 BUILD_TRAP_HANDLER(debug
)
137 regs
->pc
-= instruction_size(__raw_readw(regs
->pc
- 4));
139 if (notify_die(DIE_TRAP
, "debug trap", regs
, 0, vec
& 0xff,
140 SIGTRAP
) == NOTIFY_STOP
)
143 force_sig(SIGTRAP
, current
);
147 * Special handler for BUG() traps.
149 BUILD_TRAP_HANDLER(bug
)
154 regs
->pc
-= instruction_size(__raw_readw(regs
->pc
- 4));
156 if (notify_die(DIE_TRAP
, "bug trap", regs
, 0, TRAPA_BUG_OPCODE
& 0xff,
157 SIGTRAP
) == NOTIFY_STOP
)
160 #ifdef CONFIG_GENERIC_BUG
161 if (__kernel_text_address(instruction_pointer(regs
))) {
162 insn_size_t insn
= *(insn_size_t
*)instruction_pointer(regs
);
163 if (insn
== TRAPA_BUG_OPCODE
)
169 force_sig(SIGTRAP
, current
);
172 BUILD_TRAP_HANDLER(nmi
)
174 unsigned int cpu
= smp_processor_id();
180 switch (notify_die(DIE_NMI
, "NMI", regs
, 0, vec
& 0xff, SIGINT
)) {
185 die("Fatal Non-Maskable Interrupt", regs
, SIGINT
);
187 printk(KERN_ALERT
"Got NMI, but nobody cared. Ignoring...\n");