1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
|
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
#include <linux/cpu.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/user.h>
#include <linux/string.h>
#include <linux/linkage.h>
#include <linux/init.h>
#include <linux/ptrace.h>
#include <linux/kallsyms.h>
#include <linux/rtc.h>
#include <linux/uaccess.h>
#include <linux/kprobes.h>
#include <linux/kdebug.h>
#include <linux/sched/debug.h>
#include <asm/setup.h>
#include <asm/traps.h>
#include <asm/pgalloc.h>
#include <asm/siginfo.h>
#include <asm/mmu_context.h>
#ifdef CONFIG_CPU_HAS_FPU
#include <abi/fpu.h>
#endif
int show_unhandled_signals = 1;
/* Defined in entry.S */
asmlinkage void csky_trap(void);
asmlinkage void csky_systemcall(void);
asmlinkage void csky_cmpxchg(void);
asmlinkage void csky_get_tls(void);
asmlinkage void csky_irq(void);
asmlinkage void csky_pagefault(void);
/* Defined in head.S */
asmlinkage void _start_smp_secondary(void);
void __init pre_trap_init(void)
{
int i;
mtcr("vbr", vec_base);
for (i = 1; i < 128; i++)
VEC_INIT(i, csky_trap);
}
void __init trap_init(void)
{
VEC_INIT(VEC_AUTOVEC, csky_irq);
/* setup trap0 trap2 trap3 */
VEC_INIT(VEC_TRAP0, csky_systemcall);
VEC_INIT(VEC_TRAP2, csky_cmpxchg);
VEC_INIT(VEC_TRAP3, csky_get_tls);
/* setup MMU TLB exception */
VEC_INIT(VEC_TLBINVALIDL, csky_pagefault);
VEC_INIT(VEC_TLBINVALIDS, csky_pagefault);
VEC_INIT(VEC_TLBMODIFIED, csky_pagefault);
#ifdef CONFIG_CPU_HAS_FPU
init_fpu();
#endif
#ifdef CONFIG_SMP
mtcr("cr<28, 0>", virt_to_phys(vec_base));
VEC_INIT(VEC_RESET, (void *)virt_to_phys(_start_smp_secondary));
#endif
}
static DEFINE_SPINLOCK(die_lock);
void die(struct pt_regs *regs, const char *str)
{
static int die_counter;
int ret;
oops_enter();
spin_lock_irq(&die_lock);
console_verbose();
bust_spinlocks(1);
pr_emerg("%s [#%d]\n", str, ++die_counter);
print_modules();
show_regs(regs);
show_stack(current, (unsigned long *)regs->regs[4], KERN_INFO);
ret = notify_die(DIE_OOPS, str, regs, 0, trap_no(regs), SIGSEGV);
bust_spinlocks(0);
add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
spin_unlock_irq(&die_lock);
oops_exit();
if (in_interrupt())
panic("Fatal exception in interrupt");
if (panic_on_oops)
panic("Fatal exception");
if (ret != NOTIFY_STOP)
make_task_dead(SIGSEGV);
}
void do_trap(struct pt_regs *regs, int signo, int code, unsigned long addr)
{
struct task_struct *tsk = current;
if (show_unhandled_signals && unhandled_signal(tsk, signo)
&& printk_ratelimit()) {
pr_info("%s[%d]: unhandled signal %d code 0x%x at 0x%08lx",
tsk->comm, task_pid_nr(tsk), signo, code, addr);
print_vma_addr(KERN_CONT " in ", instruction_pointer(regs));
pr_cont("\n");
show_regs(regs);
}
force_sig_fault(signo, code, (void __user *)addr);
}
static void do_trap_error(struct pt_regs *regs, int signo, int code,
unsigned long addr, const char *str)
{
current->thread.trap_no = trap_no(regs);
if (user_mode(regs)) {
do_trap(regs, signo, code, addr);
} else {
if (!fixup_exception(regs))
die(regs, str);
}
}
#define DO_ERROR_INFO(name, signo, code, str) \
asmlinkage __visible void name(struct pt_regs *regs) \
{ \
do_trap_error(regs, signo, code, regs->pc, "Oops - " str); \
}
DO_ERROR_INFO(do_trap_unknown,
SIGILL, ILL_ILLTRP, "unknown exception");
DO_ERROR_INFO(do_trap_zdiv,
SIGFPE, FPE_INTDIV, "error zero div exception");
DO_ERROR_INFO(do_trap_buserr,
SIGSEGV, ILL_ILLADR, "error bus error exception");
asmlinkage void do_trap_misaligned(struct pt_regs *regs)
{
#ifdef CONFIG_CPU_NEED_SOFTALIGN
csky_alignment(regs);
#else
current->thread.trap_no = trap_no(regs);
do_trap_error(regs, SIGBUS, BUS_ADRALN, regs->pc,
"Oops - load/store address misaligned");
#endif
}
asmlinkage void do_trap_bkpt(struct pt_regs *regs)
{
#ifdef CONFIG_KPROBES
if (kprobe_single_step_handler(regs))
return;
#endif
#ifdef CONFIG_UPROBES
if (uprobe_single_step_handler(regs))
return;
#endif
if (user_mode(regs)) {
send_sig(SIGTRAP, current, 0);
return;
}
do_trap_error(regs, SIGILL, ILL_ILLTRP, regs->pc,
"Oops - illegal trap exception");
}
asmlinkage void do_trap_illinsn(struct pt_regs *regs)
{
current->thread.trap_no = trap_no(regs);
#ifdef CONFIG_KPROBES
if (kprobe_breakpoint_handler(regs))
return;
#endif
#ifdef CONFIG_UPROBES
if (uprobe_breakpoint_handler(regs))
return;
#endif
#ifndef CONFIG_CPU_NO_USER_BKPT
if (*(uint16_t *)instruction_pointer(regs) != USR_BKPT) {
send_sig(SIGTRAP, current, 0);
return;
}
#endif
do_trap_error(regs, SIGILL, ILL_ILLOPC, regs->pc,
"Oops - illegal instruction exception");
}
asmlinkage void do_trap_fpe(struct pt_regs *regs)
{
#ifdef CONFIG_CPU_HAS_FPU
return fpu_fpe(regs);
#else
do_trap_error(regs, SIGILL, ILL_ILLOPC, regs->pc,
"Oops - fpu instruction exception");
#endif
}
asmlinkage void do_trap_priv(struct pt_regs *regs)
{
#ifdef CONFIG_CPU_HAS_FPU
if (user_mode(regs) && fpu_libc_helper(regs))
return;
#endif
do_trap_error(regs, SIGILL, ILL_PRVOPC, regs->pc,
"Oops - illegal privileged exception");
}
asmlinkage void trap_c(struct pt_regs *regs)
{
switch (trap_no(regs)) {
case VEC_ZERODIV:
do_trap_zdiv(regs);
break;
case VEC_TRACE:
do_trap_bkpt(regs);
break;
case VEC_ILLEGAL:
do_trap_illinsn(regs);
break;
case VEC_TRAP1:
case VEC_BREAKPOINT:
do_trap_bkpt(regs);
break;
case VEC_ACCESS:
do_trap_buserr(regs);
break;
case VEC_ALIGN:
do_trap_misaligned(regs);
break;
case VEC_FPE:
do_trap_fpe(regs);
break;
case VEC_PRIV:
do_trap_priv(regs);
break;
default:
do_trap_unknown(regs);
break;
}
}
|
