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-rw-r--r--arch/m32r/kernel/traps.c324
1 files changed, 0 insertions, 324 deletions
diff --git a/arch/m32r/kernel/traps.c b/arch/m32r/kernel/traps.c
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--- a/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
34asmlinkage void alignment_check(void);
35asmlinkage void ei_handler(void);
36asmlinkage void rie_handler(void);
37asmlinkage void debug_trap(void);
38asmlinkage void cache_flushing_handler(void);
39asmlinkage void ill_trap(void);
40
41#ifdef CONFIG_SMP
42extern void smp_reschedule_interrupt(void);
43extern void smp_invalidate_interrupt(void);
44extern void smp_call_function_interrupt(void);
45extern void smp_ipi_timer_interrupt(void);
46extern void smp_flush_cache_all_interrupt(void);
47extern void smp_call_function_single_interrupt(void);
48
49/*
50 * for Boot AP function
51 */
52asm (
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
63extern unsigned long eit_vector[];
64#define BRA_INSN(func, entry) \
65 ((unsigned long)func - (unsigned long)eit_vector - entry*4)/4 \
66 + 0xff000000UL
67
68static 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
118void __init trap_init(void)
119{
120 set_eit_vector_entries();
121
122 /*
123 * Should be a barrier for any external CPU state.
124 */
125 cpu_init();
126}
127
128static int kstack_depth_to_print = 24;
129
130static void show_trace(struct task_struct *task, unsigned long *stack)
131{
132 unsigned long addr;
133
134 if (!stack)
135 stack = (unsigned long*)&stack;
136
137 printk("Call Trace: ");
138 while (!kstack_end(stack)) {
139 addr = *stack++;
140 if (__kernel_text_address(addr))
141 printk("[<%08lx>] %pSR\n", addr, (void *)addr);
142 }
143 printk("\n");
144}
145
146void show_stack(struct task_struct *task, unsigned long *sp)
147{
148 unsigned long *stack;
149 int i;
150
151 /*
152 * debugging aid: "show_stack(NULL);" prints the
153 * back trace for this cpu.
154 */
155
156 if(sp==NULL) {
157 if (task)
158 sp = (unsigned long *)task->thread.sp;
159 else
160 sp=(unsigned long*)&sp;
161 }
162
163 stack = sp;
164 for(i=0; i < kstack_depth_to_print; i++) {
165 if (kstack_end(stack))
166 break;
167 if (i && ((i % 4) == 0))
168 printk("\n ");
169 printk("%08lx ", *stack++);
170 }
171 printk("\n");
172 show_trace(task, sp);
173}
174
175static void show_registers(struct pt_regs *regs)
176{
177 int i = 0;
178 int in_kernel = 1;
179 unsigned long sp;
180
181 printk("CPU: %d\n", smp_processor_id());
182 show_regs(regs);
183
184 sp = (unsigned long) (1+regs);
185 if (user_mode(regs)) {
186 in_kernel = 0;
187 sp = regs->spu;
188 printk("SPU: %08lx\n", sp);
189 } else {
190 printk("SPI: %08lx\n", sp);
191 }
192 printk("Process %s (pid: %d, process nr: %d, stackpage=%08lx)",
193 current->comm, task_pid_nr(current), 0xffff & i, 4096+(unsigned long)current);
194
195 /*
196 * When in-kernel, we also print out the stack and code at the
197 * time of the fault..
198 */
199 if (in_kernel) {
200 printk("\nStack: ");
201 show_stack(current, (unsigned long*) sp);
202
203 printk("\nCode: ");
204 if (regs->bpc < PAGE_OFFSET)
205 goto bad;
206
207 for(i=0;i<20;i++) {
208 unsigned char c;
209 if (__get_user(c, &((unsigned char*)regs->bpc)[i])) {
210bad:
211 printk(" Bad PC value.");
212 break;
213 }
214 printk("%02x ", c);
215 }
216 }
217 printk("\n");
218}
219
220static DEFINE_SPINLOCK(die_lock);
221
222void die(const char * str, struct pt_regs * regs, long err)
223{
224 console_verbose();
225 spin_lock_irq(&die_lock);
226 bust_spinlocks(1);
227 printk("%s: %04lx\n", str, err & 0xffff);
228 show_registers(regs);
229 bust_spinlocks(0);
230 spin_unlock_irq(&die_lock);
231 do_exit(SIGSEGV);
232}
233
234static __inline__ void die_if_kernel(const char * str,
235 struct pt_regs * regs, long err)
236{
237 if (!user_mode(regs))
238 die(str, regs, err);
239}
240
241static __inline__ void do_trap(int trapnr, int signr, const char * str,
242 struct pt_regs * regs, long error_code, siginfo_t *info)
243{
244 if (user_mode(regs)) {
245 /* trap_signal */
246 struct task_struct *tsk = current;
247 tsk->thread.error_code = error_code;
248 tsk->thread.trap_no = trapnr;
249 if (info)
250 force_sig_info(signr, info, tsk);
251 else
252 force_sig(signr, tsk);
253 return;
254 } else {
255 /* kernel_trap */
256 if (!fixup_exception(regs))
257 die(str, regs, error_code);
258 return;
259 }
260}
261
262#define DO_ERROR(trapnr, signr, str, name) \
263asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
264{ \
265 do_trap(trapnr, signr, NULL, regs, error_code, NULL); \
266}
267
268#define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
269asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
270{ \
271 siginfo_t info; \
272 info.si_signo = signr; \
273 info.si_errno = 0; \
274 info.si_code = sicode; \
275 info.si_addr = (void __user *)siaddr; \
276 do_trap(trapnr, signr, str, regs, error_code, &info); \
277}
278
279DO_ERROR( 1, SIGTRAP, "debug trap", debug_trap)
280DO_ERROR_INFO(0x20, SIGILL, "reserved instruction ", rie_handler, ILL_ILLOPC, regs->bpc)
281DO_ERROR_INFO(0x100, SIGILL, "privileged instruction", pie_handler, ILL_PRVOPC, regs->bpc)
282DO_ERROR_INFO(-1, SIGILL, "illegal trap", ill_trap, ILL_ILLTRP, regs->bpc)
283
284extern int handle_unaligned_access(unsigned long, struct pt_regs *);
285
286/* This code taken from arch/sh/kernel/traps.c */
287asmlinkage void do_alignment_check(struct pt_regs *regs, long error_code)
288{
289 mm_segment_t oldfs;
290 unsigned long insn;
291 int tmp;
292
293 oldfs = get_fs();
294
295 if (user_mode(regs)) {
296 local_irq_enable();
297 current->thread.error_code = error_code;
298 current->thread.trap_no = 0x17;
299
300 set_fs(USER_DS);
301 if (copy_from_user(&insn, (void *)regs->bpc, 4)) {
302 set_fs(oldfs);
303 goto uspace_segv;
304 }
305 tmp = handle_unaligned_access(insn, regs);
306 set_fs(oldfs);
307
308 if (!tmp)
309 return;
310
311 uspace_segv:
312 printk(KERN_NOTICE "Killing process \"%s\" due to unaligned "
313 "access\n", current->comm);
314 force_sig(SIGSEGV, current);
315 } else {
316 set_fs(KERNEL_DS);
317 if (copy_from_user(&insn, (void *)regs->bpc, 4)) {
318 set_fs(oldfs);
319 die("insn faulting in do_address_error", regs, 0);
320 }
321 handle_unaligned_access(insn, regs);
322 set_fs(oldfs);
323 }
324}
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