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Linux/arch/m32r/kernel/traps.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  *  linux/arch/m32r/kernel/traps.c
  4  *
  5  *  Copyright (C) 2001, 2002  Hirokazu Takata, Hiroyuki Kondo,
  6  *                            Hitoshi Yamamoto
  7  */
  8 
  9 /*
 10  * 'traps.c' handles hardware traps and faults after we have saved some
 11  * state in 'entry.S'.
 12  */
 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>
 20 #include <linux/mm.h>
 21 #include <linux/cpu.h>
 22 
 23 #include <asm/page.h>
 24 #include <asm/processor.h>
 25 
 26 #include <linux/uaccess.h>
 27 #include <asm/io.h>
 28 #include <linux/atomic.h>
 29 
 30 #include <asm/smp.h>
 31 
 32 #include <linux/module.h>
 33 
 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);
 40 
 41 #ifdef CONFIG_SMP
 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);
 48 
 49 /*
 50  * for Boot AP function
 51  */
 52 asm (
 53         "       .section .eit_vector4,\"ax\"    \n"
 54         "       .global _AP_RE                  \n"
 55         "       .global startup_AP              \n"
 56         "_AP_RE:                                \n"
 57         "       .fill 32, 4, 0                  \n"
 58         "_AP_EI: bra    startup_AP              \n"
 59         "       .previous                       \n"
 60 );
 61 #endif  /* CONFIG_SMP */
 62 
 63 extern unsigned long    eit_vector[];
 64 #define BRA_INSN(func, entry)   \
 65         ((unsigned long)func - (unsigned long)eit_vector - entry*4)/4 \
 66         + 0xff000000UL
 67 
 68 static void set_eit_vector_entries(void)
 69 {
 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);
 76 
 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);
101 #ifdef CONFIG_MMU
102         eit_vector[68] = BRA_INSN(ace_handler, 68);
103         eit_vector[72] = BRA_INSN(tme_handler, 72);
104 #endif /* CONFIG_MMU */
105 #ifdef CONFIG_SMP
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;
113         eit_vector[191] = 0;
114 #endif
115         _flush_cache_copyback_all();
116 }
117 
118 void abort(void)
119 {
120         BUG();
121 
122         /* if that doesn't kill us, halt */
123         panic("Oops failed to kill thread");
124 }
125 EXPORT_SYMBOL(abort);
126 
127 void __init trap_init(void)
128 {
129         set_eit_vector_entries();
130 
131         /*
132          * Should be a barrier for any external CPU state.
133          */
134         cpu_init();
135 }
136 
137 static int kstack_depth_to_print = 24;
138 
139 static void show_trace(struct task_struct *task, unsigned long *stack)
140 {
141         unsigned long addr;
142 
143         if (!stack)
144                 stack = (unsigned long*)&stack;
145 
146         printk("Call Trace: ");
147         while (!kstack_end(stack)) {
148                 addr = *stack++;
149                 if (__kernel_text_address(addr))
150                         printk("[<%08lx>] %pSR\n", addr, (void *)addr);
151         }
152         printk("\n");
153 }
154 
155 void show_stack(struct task_struct *task, unsigned long *sp)
156 {
157         unsigned long  *stack;
158         int  i;
159 
160         /*
161          * debugging aid: "show_stack(NULL);" prints the
162          * back trace for this cpu.
163          */
164 
165         if(sp==NULL) {
166                 if (task)
167                         sp = (unsigned long *)task->thread.sp;
168                 else
169                         sp=(unsigned long*)&sp;
170         }
171 
172         stack = sp;
173         for(i=0; i < kstack_depth_to_print; i++) {
174                 if (kstack_end(stack))
175                         break;
176                 if (i && ((i % 4) == 0))
177                         printk("\n       ");
178                 printk("%08lx ", *stack++);
179         }
180         printk("\n");
181         show_trace(task, sp);
182 }
183 
184 static void show_registers(struct pt_regs *regs)
185 {
186         int i = 0;
187         int in_kernel = 1;
188         unsigned long sp;
189 
190         printk("CPU:    %d\n", smp_processor_id());
191         show_regs(regs);
192 
193         sp = (unsigned long) (1+regs);
194         if (user_mode(regs)) {
195                 in_kernel = 0;
196                 sp = regs->spu;
197                 printk("SPU: %08lx\n", sp);
198         } else {
199                 printk("SPI: %08lx\n", sp);
200         }
201         printk("Process %s (pid: %d, process nr: %d, stackpage=%08lx)",
202                 current->comm, task_pid_nr(current), 0xffff & i, 4096+(unsigned long)current);
203 
204         /*
205          * When in-kernel, we also print out the stack and code at the
206          * time of the fault..
207          */
208         if (in_kernel) {
209                 printk("\nStack: ");
210                 show_stack(current, (unsigned long*) sp);
211 
212                 printk("\nCode: ");
213                 if (regs->bpc < PAGE_OFFSET)
214                         goto bad;
215 
216                 for(i=0;i<20;i++) {
217                         unsigned char c;
218                         if (__get_user(c, &((unsigned char*)regs->bpc)[i])) {
219 bad:
220                                 printk(" Bad PC value.");
221                                 break;
222                         }
223                         printk("%02x ", c);
224                 }
225         }
226         printk("\n");
227 }
228 
229 static DEFINE_SPINLOCK(die_lock);
230 
231 void die(const char * str, struct pt_regs * regs, long err)
232 {
233         console_verbose();
234         spin_lock_irq(&die_lock);
235         bust_spinlocks(1);
236         printk("%s: %04lx\n", str, err & 0xffff);
237         show_registers(regs);
238         bust_spinlocks(0);
239         spin_unlock_irq(&die_lock);
240         do_exit(SIGSEGV);
241 }
242 
243 static __inline__ void die_if_kernel(const char * str,
244         struct pt_regs * regs, long err)
245 {
246         if (!user_mode(regs))
247                 die(str, regs, err);
248 }
249 
250 static __inline__ void do_trap(int trapnr, int signr, const char * str,
251         struct pt_regs * regs, long error_code, siginfo_t *info)
252 {
253         if (user_mode(regs)) {
254                 /* trap_signal */
255                 struct task_struct *tsk = current;
256                 tsk->thread.error_code = error_code;
257                 tsk->thread.trap_no = trapnr;
258                 if (info)
259                         force_sig_info(signr, info, tsk);
260                 else
261                         force_sig(signr, tsk);
262                 return;
263         } else {
264                 /* kernel_trap */
265                 if (!fixup_exception(regs))
266                         die(str, regs, error_code);
267                 return;
268         }
269 }
270 
271 #define DO_ERROR(trapnr, signr, str, name) \
272 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
273 { \
274         do_trap(trapnr, signr, NULL, regs, error_code, NULL); \
275 }
276 
277 #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
278 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
279 { \
280         siginfo_t info; \
281         info.si_signo = signr; \
282         info.si_errno = 0; \
283         info.si_code = sicode; \
284         info.si_addr = (void __user *)siaddr; \
285         do_trap(trapnr, signr, str, regs, error_code, &info); \
286 }
287 
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)
292 
293 extern int handle_unaligned_access(unsigned long, struct pt_regs *);
294 
295 /* This code taken from arch/sh/kernel/traps.c */
296 asmlinkage void do_alignment_check(struct pt_regs *regs, long error_code)
297 {
298         mm_segment_t oldfs;
299         unsigned long insn;
300         int tmp;
301 
302         oldfs = get_fs();
303 
304         if (user_mode(regs)) {
305                 local_irq_enable();
306                 current->thread.error_code = error_code;
307                 current->thread.trap_no = 0x17;
308 
309                 set_fs(USER_DS);
310                 if (copy_from_user(&insn, (void *)regs->bpc, 4)) {
311                         set_fs(oldfs);
312                         goto uspace_segv;
313                 }
314                 tmp = handle_unaligned_access(insn, regs);
315                 set_fs(oldfs);
316 
317                 if (!tmp)
318                         return;
319 
320         uspace_segv:
321                 printk(KERN_NOTICE "Killing process \"%s\" due to unaligned "
322                         "access\n", current->comm);
323                 force_sig(SIGSEGV, current);
324         } else {
325                 set_fs(KERNEL_DS);
326                 if (copy_from_user(&insn, (void *)regs->bpc, 4)) {
327                         set_fs(oldfs);
328                         die("insn faulting in do_address_error", regs, 0);
329                 }
330                 handle_unaligned_access(insn, regs);
331                 set_fs(oldfs);
332         }
333 }
334 

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