2 * linux/arch/m32r/kernel/traps.c
4 * Copyright (C) 2001, 2002 Hirokazu Takata, Hiroyuki Kondo,
11 * 'traps.c' handles hardware traps and faults after we have saved some
14 #include <linux/config.h>
15 #include <linux/init.h>
16 #include <linux/kernel.h>
17 #include <linux/kallsyms.h>
18 #include <linux/stddef.h>
19 #include <linux/ptrace.h>
22 #include <asm/processor.h>
24 #include <asm/system.h>
25 #include <asm/uaccess.h>
27 #include <asm/atomic.h>
31 #include <linux/module.h>
33 asmlinkage void alignment_check(void);
34 asmlinkage void ei_handler(void);
35 asmlinkage void rie_handler(void);
36 asmlinkage void debug_trap(void);
37 asmlinkage void cache_flushing_handler(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);
47 * for Boot AP function
50 " .section .eit_vector4,\"ax\" \n"
52 " .global startup_AP \n"
55 "_AP_EI: bra startup_AP \n"
58 #endif /* CONFIG_SMP */
60 extern unsigned long eit_vector[];
61 #define BRA_INSN(func, entry) \
62 ((unsigned long)func - (unsigned long)eit_vector - entry*4)/4 \
65 void set_eit_vector_entries(void)
67 extern void default_eit_handler(void);
68 extern void system_call(void);
69 extern void pie_handler(void);
70 extern void ace_handler(void);
71 extern void tme_handler(void);
72 extern void _flush_cache_copyback_all(void);
74 eit_vector[0] = 0xd0c00001; /* seth r0, 0x01 */
75 eit_vector[1] = BRA_INSN(default_eit_handler, 1);
76 eit_vector[4] = 0xd0c00010; /* seth r0, 0x10 */
77 eit_vector[5] = BRA_INSN(default_eit_handler, 5);
78 eit_vector[8] = BRA_INSN(rie_handler, 8);
79 eit_vector[12] = BRA_INSN(alignment_check, 12);
80 eit_vector[16] = 0xff000000UL;
81 eit_vector[17] = BRA_INSN(debug_trap, 17);
82 eit_vector[18] = BRA_INSN(system_call, 18);
83 eit_vector[19] = 0xff000000UL;
84 eit_vector[20] = 0xff000000UL;
85 eit_vector[21] = 0xff000000UL;
86 eit_vector[22] = 0xff000000UL;
87 eit_vector[23] = 0xff000000UL;
88 eit_vector[24] = 0xff000000UL;
89 eit_vector[25] = 0xff000000UL;
90 eit_vector[26] = 0xff000000UL;
91 eit_vector[27] = 0xff000000UL;
92 eit_vector[28] = BRA_INSN(cache_flushing_handler, 28);
93 eit_vector[29] = 0xff000000UL;
94 eit_vector[30] = 0xff000000UL;
95 eit_vector[31] = 0xff000000UL;
96 eit_vector[32] = BRA_INSN(ei_handler, 32);
97 eit_vector[64] = BRA_INSN(pie_handler, 64);
99 eit_vector[68] = BRA_INSN(ace_handler, 68);
100 eit_vector[72] = BRA_INSN(tme_handler, 72);
101 #endif /* CONFIG_MMU */
103 eit_vector[184] = (unsigned long)smp_reschedule_interrupt;
104 eit_vector[185] = (unsigned long)smp_invalidate_interrupt;
105 eit_vector[186] = (unsigned long)smp_call_function_interrupt;
106 eit_vector[187] = (unsigned long)smp_ipi_timer_interrupt;
107 eit_vector[188] = (unsigned long)smp_flush_cache_all_interrupt;
112 _flush_cache_copyback_all();
115 void __init trap_init(void)
117 set_eit_vector_entries();
120 * Should be a barrier for any external CPU state.
125 int kstack_depth_to_print = 24;
127 void show_trace(struct task_struct *task, unsigned long *stack)
132 stack = (unsigned long*)&stack;
134 printk("Call Trace: ");
135 while (!kstack_end(stack)) {
137 if (__kernel_text_address(addr)) {
138 printk("[<%08lx>] ", addr);
139 print_symbol("%s\n", addr);
145 void show_stack(struct task_struct *task, unsigned long *sp)
147 unsigned long *stack;
151 * debugging aid: "show_stack(NULL);" prints the
152 * back trace for this cpu.
157 sp = (unsigned long *)task->thread.sp;
159 sp=(unsigned long*)&sp;
163 for(i=0; i < kstack_depth_to_print; i++) {
164 if (kstack_end(stack))
166 if (i && ((i % 4) == 0))
168 printk("%08lx ", *stack++);
171 show_trace(task, sp);
174 void dump_stack(void)
178 show_trace(current, &stack);
181 EXPORT_SYMBOL(dump_stack);
183 static void show_registers(struct pt_regs *regs)
189 printk("CPU: %d\n", smp_processor_id());
192 sp = (unsigned long) (1+regs);
193 if (user_mode(regs)) {
196 printk("SPU: %08lx\n", sp);
198 printk("SPI: %08lx\n", sp);
200 printk("Process %s (pid: %d, process nr: %d, stackpage=%08lx)",
201 current->comm, current->pid, 0xffff & i, 4096+(unsigned long)current);
204 * When in-kernel, we also print out the stack and code at the
205 * time of the fault..
209 show_stack(current, (unsigned long*) sp);
212 if (regs->bpc < PAGE_OFFSET)
217 if (__get_user(c, &((unsigned char*)regs->bpc)[i])) {
219 printk(" Bad PC value.");
228 DEFINE_SPINLOCK(die_lock);
230 void die(const char * str, struct pt_regs * regs, long err)
233 spin_lock_irq(&die_lock);
235 printk("%s: %04lx\n", str, err & 0xffff);
236 show_registers(regs);
238 spin_unlock_irq(&die_lock);
242 static __inline__ void die_if_kernel(const char * str,
243 struct pt_regs * regs, long err)
245 if (!user_mode(regs))
249 static __inline__ void do_trap(int trapnr, int signr, const char * str,
250 struct pt_regs * regs, long error_code, siginfo_t *info)
252 if (user_mode(regs)) {
254 struct task_struct *tsk = current;
255 tsk->thread.error_code = error_code;
256 tsk->thread.trap_no = trapnr;
258 force_sig_info(signr, info, tsk);
260 force_sig(signr, tsk);
264 if (!fixup_exception(regs))
265 die(str, regs, error_code);
270 #define DO_ERROR(trapnr, signr, str, name) \
271 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
273 do_trap(trapnr, signr, 0, regs, error_code, NULL); \
276 #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
277 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
280 info.si_signo = signr; \
282 info.si_code = sicode; \
283 info.si_addr = (void __user *)siaddr; \
284 do_trap(trapnr, signr, str, regs, error_code, &info); \
287 DO_ERROR( 1, SIGTRAP, "debug trap", debug_trap)
288 DO_ERROR_INFO(0x20, SIGILL, "reserved instruction ", rie_handler, ILL_ILLOPC, regs->bpc)
289 DO_ERROR_INFO(0x100, SIGILL, "privilege instruction", pie_handler, ILL_PRVOPC, regs->bpc)
291 extern int handle_unaligned_access(unsigned long, struct pt_regs *);
293 /* This code taken from arch/sh/kernel/traps.c */
294 asmlinkage void do_alignment_check(struct pt_regs *regs, long error_code)
302 if (user_mode(regs)) {
304 current->thread.error_code = error_code;
305 current->thread.trap_no = 0x17;
308 if (copy_from_user(&insn, (void *)regs->bpc, 4)) {
312 tmp = handle_unaligned_access(insn, regs);
319 printk(KERN_NOTICE "Killing process \"%s\" due to unaligned "
320 "access\n", current->comm);
321 force_sig(SIGSEGV, current);
324 if (copy_from_user(&insn, (void *)regs->bpc, 4)) {
326 die("insn faulting in do_address_error", regs, 0);
328 handle_unaligned_access(insn, regs);