1 // SPDX-License-Identifier: GPL-2.0
3 * linux/arch/m32r/kernel/traps.c
5 * Copyright (C) 2001, 2002 Hirokazu Takata, Hiroyuki Kondo,
10 * 'traps.c' handles hardware traps and faults after we have saved some
13 #include <linux/init.h>
14 #include <linux/kernel.h>
15 #include <linux/kallsyms.h>
16 #include <linux/stddef.h>
17 #include <linux/ptrace.h>
18 #include <linux/sched/debug.h>
19 #include <linux/sched/task_stack.h>
21 #include <linux/cpu.h>
24 #include <asm/processor.h>
26 #include <linux/uaccess.h>
28 #include <linux/atomic.h>
32 #include <linux/module.h>
34 asmlinkage
void alignment_check(void);
35 asmlinkage
void ei_handler(void);
36 asmlinkage
void rie_handler(void);
37 asmlinkage
void debug_trap(void);
38 asmlinkage
void cache_flushing_handler(void);
39 asmlinkage
void ill_trap(void);
42 extern void smp_reschedule_interrupt(void);
43 extern void smp_invalidate_interrupt(void);
44 extern void smp_call_function_interrupt(void);
45 extern void smp_ipi_timer_interrupt(void);
46 extern void smp_flush_cache_all_interrupt(void);
47 extern void smp_call_function_single_interrupt(void);
50 * for Boot AP function
53 " .section .eit_vector4,\"ax\" \n"
55 " .global startup_AP \n"
58 "_AP_EI: bra startup_AP \n"
61 #endif /* CONFIG_SMP */
63 extern unsigned long eit_vector
[];
64 #define BRA_INSN(func, entry) \
65 ((unsigned long)func - (unsigned long)eit_vector - entry*4)/4 \
68 static void set_eit_vector_entries(void)
70 extern void default_eit_handler(void);
71 extern void system_call(void);
72 extern void pie_handler(void);
73 extern void ace_handler(void);
74 extern void tme_handler(void);
75 extern void _flush_cache_copyback_all(void);
77 eit_vector
[0] = 0xd0c00001; /* seth r0, 0x01 */
78 eit_vector
[1] = BRA_INSN(default_eit_handler
, 1);
79 eit_vector
[4] = 0xd0c00010; /* seth r0, 0x10 */
80 eit_vector
[5] = BRA_INSN(default_eit_handler
, 5);
81 eit_vector
[8] = BRA_INSN(rie_handler
, 8);
82 eit_vector
[12] = BRA_INSN(alignment_check
, 12);
83 eit_vector
[16] = BRA_INSN(ill_trap
, 16);
84 eit_vector
[17] = BRA_INSN(debug_trap
, 17);
85 eit_vector
[18] = BRA_INSN(system_call
, 18);
86 eit_vector
[19] = BRA_INSN(ill_trap
, 19);
87 eit_vector
[20] = BRA_INSN(ill_trap
, 20);
88 eit_vector
[21] = BRA_INSN(ill_trap
, 21);
89 eit_vector
[22] = BRA_INSN(ill_trap
, 22);
90 eit_vector
[23] = BRA_INSN(ill_trap
, 23);
91 eit_vector
[24] = BRA_INSN(ill_trap
, 24);
92 eit_vector
[25] = BRA_INSN(ill_trap
, 25);
93 eit_vector
[26] = BRA_INSN(ill_trap
, 26);
94 eit_vector
[27] = BRA_INSN(ill_trap
, 27);
95 eit_vector
[28] = BRA_INSN(cache_flushing_handler
, 28);
96 eit_vector
[29] = BRA_INSN(ill_trap
, 29);
97 eit_vector
[30] = BRA_INSN(ill_trap
, 30);
98 eit_vector
[31] = BRA_INSN(ill_trap
, 31);
99 eit_vector
[32] = BRA_INSN(ei_handler
, 32);
100 eit_vector
[64] = BRA_INSN(pie_handler
, 64);
102 eit_vector
[68] = BRA_INSN(ace_handler
, 68);
103 eit_vector
[72] = BRA_INSN(tme_handler
, 72);
104 #endif /* CONFIG_MMU */
106 eit_vector
[184] = (unsigned long)smp_reschedule_interrupt
;
107 eit_vector
[185] = (unsigned long)smp_invalidate_interrupt
;
108 eit_vector
[186] = (unsigned long)smp_call_function_interrupt
;
109 eit_vector
[187] = (unsigned long)smp_ipi_timer_interrupt
;
110 eit_vector
[188] = (unsigned long)smp_flush_cache_all_interrupt
;
111 eit_vector
[189] = 0; /* CPU_BOOT_IPI */
112 eit_vector
[190] = (unsigned long)smp_call_function_single_interrupt
;
115 _flush_cache_copyback_all();
122 /* if that doesn't kill us, halt */
123 panic("Oops failed to kill thread");
125 EXPORT_SYMBOL(abort
);
127 void __init
trap_init(void)
129 set_eit_vector_entries();
132 * Should be a barrier for any external CPU state.
137 static int kstack_depth_to_print
= 24;
139 static void show_trace(struct task_struct
*task
, unsigned long *stack
)
144 stack
= (unsigned long*)&stack
;
146 printk("Call Trace: ");
147 while (!kstack_end(stack
)) {
149 if (__kernel_text_address(addr
))
150 printk("[<%08lx>] %pSR\n", addr
, (void *)addr
);
155 void show_stack(struct task_struct
*task
, unsigned long *sp
)
157 unsigned long *stack
;
161 * debugging aid: "show_stack(NULL);" prints the
162 * back trace for this cpu.
167 sp
= (unsigned long *)task
->thread
.sp
;
169 sp
=(unsigned long*)&sp
;
173 for(i
=0; i
< kstack_depth_to_print
; i
++) {
174 if (kstack_end(stack
))
176 if (i
&& ((i
% 4) == 0))
178 printk("%08lx ", *stack
++);
181 show_trace(task
, sp
);
184 static void show_registers(struct pt_regs
*regs
)
190 printk("CPU: %d\n", smp_processor_id());
193 sp
= (unsigned long) (1+regs
);
194 if (user_mode(regs
)) {
197 printk("SPU: %08lx\n", sp
);
199 printk("SPI: %08lx\n", sp
);
201 printk("Process %s (pid: %d, process nr: %d, stackpage=%08lx)",
202 current
->comm
, task_pid_nr(current
), 0xffff & i
, 4096+(unsigned long)current
);
205 * When in-kernel, we also print out the stack and code at the
206 * time of the fault..
210 show_stack(current
, (unsigned long*) sp
);
213 if (regs
->bpc
< PAGE_OFFSET
)
218 if (__get_user(c
, &((unsigned char*)regs
->bpc
)[i
])) {
220 printk(" Bad PC value.");
229 static DEFINE_SPINLOCK(die_lock
);
231 void die(const char * str
, struct pt_regs
* regs
, long err
)
234 spin_lock_irq(&die_lock
);
236 printk("%s: %04lx\n", str
, err
& 0xffff);
237 show_registers(regs
);
239 spin_unlock_irq(&die_lock
);
243 static __inline__
void die_if_kernel(const char * str
,
244 struct pt_regs
* regs
, long err
)
246 if (!user_mode(regs
))
250 static __inline__
void do_trap(int trapnr
, int signr
, const char * str
,
251 struct pt_regs
* regs
, long error_code
, siginfo_t
*info
)
253 if (user_mode(regs
)) {
255 struct task_struct
*tsk
= current
;
256 tsk
->thread
.error_code
= error_code
;
257 tsk
->thread
.trap_no
= trapnr
;
259 force_sig_info(signr
, info
, tsk
);
261 force_sig(signr
, tsk
);
265 if (!fixup_exception(regs
))
266 die(str
, regs
, error_code
);
271 #define DO_ERROR(trapnr, signr, str, name) \
272 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
274 do_trap(trapnr, signr, NULL, regs, error_code, NULL); \
277 #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
278 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
281 info.si_signo = signr; \
283 info.si_code = sicode; \
284 info.si_addr = (void __user *)siaddr; \
285 do_trap(trapnr, signr, str, regs, error_code, &info); \
288 DO_ERROR( 1, SIGTRAP
, "debug trap", debug_trap
)
289 DO_ERROR_INFO(0x20, SIGILL
, "reserved instruction ", rie_handler
, ILL_ILLOPC
, regs
->bpc
)
290 DO_ERROR_INFO(0x100, SIGILL
, "privileged instruction", pie_handler
, ILL_PRVOPC
, regs
->bpc
)
291 DO_ERROR_INFO(-1, SIGILL
, "illegal trap", ill_trap
, ILL_ILLTRP
, regs
->bpc
)
293 extern int handle_unaligned_access(unsigned long, struct pt_regs
*);
295 /* This code taken from arch/sh/kernel/traps.c */
296 asmlinkage
void do_alignment_check(struct pt_regs
*regs
, long error_code
)
304 if (user_mode(regs
)) {
306 current
->thread
.error_code
= error_code
;
307 current
->thread
.trap_no
= 0x17;
310 if (copy_from_user(&insn
, (void *)regs
->bpc
, 4)) {
314 tmp
= handle_unaligned_access(insn
, regs
);
321 printk(KERN_NOTICE
"Killing process \"%s\" due to unaligned "
322 "access\n", current
->comm
);
323 force_sig(SIGSEGV
, current
);
326 if (copy_from_user(&insn
, (void *)regs
->bpc
, 4)) {
328 die("insn faulting in do_address_error", regs
, 0);
330 handle_unaligned_access(insn
, regs
);