2 * linux/arch/m32r/kernel/traps.c
4 * Copyright (C) 2001, 2002 Hirokazu Takata, Hiroyuki Kondo,
9 * 'traps.c' handles hardware traps and faults after we have saved some
12 #include <linux/init.h>
13 #include <linux/kernel.h>
14 #include <linux/kallsyms.h>
15 #include <linux/stddef.h>
16 #include <linux/ptrace.h>
17 #include <linux/sched/debug.h>
18 #include <linux/sched/task_stack.h>
22 #include <asm/processor.h>
24 #include <linux/uaccess.h>
26 #include <linux/atomic.h>
30 #include <linux/module.h>
32 asmlinkage
void alignment_check(void);
33 asmlinkage
void ei_handler(void);
34 asmlinkage
void rie_handler(void);
35 asmlinkage
void debug_trap(void);
36 asmlinkage
void cache_flushing_handler(void);
37 asmlinkage
void ill_trap(void);
40 extern void smp_reschedule_interrupt(void);
41 extern void smp_invalidate_interrupt(void);
42 extern void smp_call_function_interrupt(void);
43 extern void smp_ipi_timer_interrupt(void);
44 extern void smp_flush_cache_all_interrupt(void);
45 extern void smp_call_function_single_interrupt(void);
48 * for Boot AP function
51 " .section .eit_vector4,\"ax\" \n"
53 " .global startup_AP \n"
56 "_AP_EI: bra startup_AP \n"
59 #endif /* CONFIG_SMP */
61 extern unsigned long eit_vector
[];
62 #define BRA_INSN(func, entry) \
63 ((unsigned long)func - (unsigned long)eit_vector - entry*4)/4 \
66 static void set_eit_vector_entries(void)
68 extern void default_eit_handler(void);
69 extern void system_call(void);
70 extern void pie_handler(void);
71 extern void ace_handler(void);
72 extern void tme_handler(void);
73 extern void _flush_cache_copyback_all(void);
75 eit_vector
[0] = 0xd0c00001; /* seth r0, 0x01 */
76 eit_vector
[1] = BRA_INSN(default_eit_handler
, 1);
77 eit_vector
[4] = 0xd0c00010; /* seth r0, 0x10 */
78 eit_vector
[5] = BRA_INSN(default_eit_handler
, 5);
79 eit_vector
[8] = BRA_INSN(rie_handler
, 8);
80 eit_vector
[12] = BRA_INSN(alignment_check
, 12);
81 eit_vector
[16] = BRA_INSN(ill_trap
, 16);
82 eit_vector
[17] = BRA_INSN(debug_trap
, 17);
83 eit_vector
[18] = BRA_INSN(system_call
, 18);
84 eit_vector
[19] = BRA_INSN(ill_trap
, 19);
85 eit_vector
[20] = BRA_INSN(ill_trap
, 20);
86 eit_vector
[21] = BRA_INSN(ill_trap
, 21);
87 eit_vector
[22] = BRA_INSN(ill_trap
, 22);
88 eit_vector
[23] = BRA_INSN(ill_trap
, 23);
89 eit_vector
[24] = BRA_INSN(ill_trap
, 24);
90 eit_vector
[25] = BRA_INSN(ill_trap
, 25);
91 eit_vector
[26] = BRA_INSN(ill_trap
, 26);
92 eit_vector
[27] = BRA_INSN(ill_trap
, 27);
93 eit_vector
[28] = BRA_INSN(cache_flushing_handler
, 28);
94 eit_vector
[29] = BRA_INSN(ill_trap
, 29);
95 eit_vector
[30] = BRA_INSN(ill_trap
, 30);
96 eit_vector
[31] = BRA_INSN(ill_trap
, 31);
97 eit_vector
[32] = BRA_INSN(ei_handler
, 32);
98 eit_vector
[64] = BRA_INSN(pie_handler
, 64);
100 eit_vector
[68] = BRA_INSN(ace_handler
, 68);
101 eit_vector
[72] = BRA_INSN(tme_handler
, 72);
102 #endif /* CONFIG_MMU */
104 eit_vector
[184] = (unsigned long)smp_reschedule_interrupt
;
105 eit_vector
[185] = (unsigned long)smp_invalidate_interrupt
;
106 eit_vector
[186] = (unsigned long)smp_call_function_interrupt
;
107 eit_vector
[187] = (unsigned long)smp_ipi_timer_interrupt
;
108 eit_vector
[188] = (unsigned long)smp_flush_cache_all_interrupt
;
109 eit_vector
[189] = 0; /* CPU_BOOT_IPI */
110 eit_vector
[190] = (unsigned long)smp_call_function_single_interrupt
;
113 _flush_cache_copyback_all();
116 void __init
trap_init(void)
118 set_eit_vector_entries();
121 * Should be a barrier for any external CPU state.
126 static int kstack_depth_to_print
= 24;
128 static void show_trace(struct task_struct
*task
, unsigned long *stack
)
133 stack
= (unsigned long*)&stack
;
135 printk("Call Trace: ");
136 while (!kstack_end(stack
)) {
138 if (__kernel_text_address(addr
))
139 printk("[<%08lx>] %pSR\n", addr
, (void *)addr
);
144 void show_stack(struct task_struct
*task
, unsigned long *sp
)
146 unsigned long *stack
;
150 * debugging aid: "show_stack(NULL);" prints the
151 * back trace for this cpu.
156 sp
= (unsigned long *)task
->thread
.sp
;
158 sp
=(unsigned long*)&sp
;
162 for(i
=0; i
< kstack_depth_to_print
; i
++) {
163 if (kstack_end(stack
))
165 if (i
&& ((i
% 4) == 0))
167 printk("%08lx ", *stack
++);
170 show_trace(task
, sp
);
173 static void show_registers(struct pt_regs
*regs
)
179 printk("CPU: %d\n", smp_processor_id());
182 sp
= (unsigned long) (1+regs
);
183 if (user_mode(regs
)) {
186 printk("SPU: %08lx\n", sp
);
188 printk("SPI: %08lx\n", sp
);
190 printk("Process %s (pid: %d, process nr: %d, stackpage=%08lx)",
191 current
->comm
, task_pid_nr(current
), 0xffff & i
, 4096+(unsigned long)current
);
194 * When in-kernel, we also print out the stack and code at the
195 * time of the fault..
199 show_stack(current
, (unsigned long*) sp
);
202 if (regs
->bpc
< PAGE_OFFSET
)
207 if (__get_user(c
, &((unsigned char*)regs
->bpc
)[i
])) {
209 printk(" Bad PC value.");
218 static DEFINE_SPINLOCK(die_lock
);
220 void die(const char * str
, struct pt_regs
* regs
, long err
)
223 spin_lock_irq(&die_lock
);
225 printk("%s: %04lx\n", str
, err
& 0xffff);
226 show_registers(regs
);
228 spin_unlock_irq(&die_lock
);
232 static __inline__
void die_if_kernel(const char * str
,
233 struct pt_regs
* regs
, long err
)
235 if (!user_mode(regs
))
239 static __inline__
void do_trap(int trapnr
, int signr
, const char * str
,
240 struct pt_regs
* regs
, long error_code
, siginfo_t
*info
)
242 if (user_mode(regs
)) {
244 struct task_struct
*tsk
= current
;
245 tsk
->thread
.error_code
= error_code
;
246 tsk
->thread
.trap_no
= trapnr
;
248 force_sig_info(signr
, info
, tsk
);
250 force_sig(signr
, tsk
);
254 if (!fixup_exception(regs
))
255 die(str
, regs
, error_code
);
260 #define DO_ERROR(trapnr, signr, str, name) \
261 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
263 do_trap(trapnr, signr, NULL, regs, error_code, NULL); \
266 #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
267 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
270 info.si_signo = signr; \
272 info.si_code = sicode; \
273 info.si_addr = (void __user *)siaddr; \
274 do_trap(trapnr, signr, str, regs, error_code, &info); \
277 DO_ERROR( 1, SIGTRAP
, "debug trap", debug_trap
)
278 DO_ERROR_INFO(0x20, SIGILL
, "reserved instruction ", rie_handler
, ILL_ILLOPC
, regs
->bpc
)
279 DO_ERROR_INFO(0x100, SIGILL
, "privileged instruction", pie_handler
, ILL_PRVOPC
, regs
->bpc
)
280 DO_ERROR_INFO(-1, SIGILL
, "illegal trap", ill_trap
, ILL_ILLTRP
, regs
->bpc
)
282 extern int handle_unaligned_access(unsigned long, struct pt_regs
*);
284 /* This code taken from arch/sh/kernel/traps.c */
285 asmlinkage
void do_alignment_check(struct pt_regs
*regs
, long error_code
)
293 if (user_mode(regs
)) {
295 current
->thread
.error_code
= error_code
;
296 current
->thread
.trap_no
= 0x17;
299 if (copy_from_user(&insn
, (void *)regs
->bpc
, 4)) {
303 tmp
= handle_unaligned_access(insn
, regs
);
310 printk(KERN_NOTICE
"Killing process \"%s\" due to unaligned "
311 "access\n", current
->comm
);
312 force_sig(SIGSEGV
, current
);
315 if (copy_from_user(&insn
, (void *)regs
->bpc
, 4)) {
317 die("insn faulting in do_address_error", regs
, 0);
319 handle_unaligned_access(insn
, regs
);