tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
ARC: Non-MMU Exception Handling
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
+125
-7
-7
arch/arc/include/asm/hw_irq.h
-7
arch/arc/include/asm/hw_irq.h
···
1
-
/*
2
-
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
3
-
*
4
-
* This program is free software; you can redistribute it and/or modify
5
-
* it under the terms of the GNU General Public License version 2 as
6
-
* published by the Free Software Foundation.
7
-
*/
+125
arch/arc/kernel/traps.c
+125
arch/arc/kernel/traps.c
···
1
+
/*
2
+
* Traps/Non-MMU Exception handling for ARC
3
+
*
4
+
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
5
+
*
6
+
* This program is free software; you can redistribute it and/or modify
7
+
* it under the terms of the GNU General Public License version 2 as
8
+
* published by the Free Software Foundation.
9
+
*
10
+
* Rahul Trivedi: Codito Technologies 2004
11
+
*/
12
+
13
+
#include <linux/sched.h>
14
+
#include <linux/kdebug.h>
15
+
#include <linux/uaccess.h>
16
+
#include <asm/ptrace.h>
17
+
#include <asm/setup.h>
18
+
19
+
void __init trap_init(void)
20
+
{
21
+
return;
22
+
}
23
+
24
+
void die(const char *str, struct pt_regs *regs, unsigned long address,
25
+
unsigned long cause_reg)
26
+
{
27
+
show_kernel_fault_diag(str, regs, address, cause_reg);
28
+
29
+
/* DEAD END */
30
+
__asm__("flag 1");
31
+
}
32
+
33
+
/*
34
+
* Helper called for bulk of exceptions NOT needing specific handling
35
+
* -for user faults enqueues requested signal
36
+
* -for kernel, chk if due to copy_(to|from)_user, otherwise die()
37
+
*/
38
+
static noinline int handle_exception(unsigned long cause, char *str,
39
+
struct pt_regs *regs, siginfo_t *info)
40
+
{
41
+
if (user_mode(regs)) {
42
+
struct task_struct *tsk = current;
43
+
44
+
tsk->thread.fault_address = (__force unsigned int)info->si_addr;
45
+
tsk->thread.cause_code = cause;
46
+
47
+
force_sig_info(info->si_signo, info, tsk);
48
+
49
+
} else {
50
+
/* If not due to copy_(to|from)_user, we are doomed */
51
+
if (fixup_exception(regs))
52
+
return 0;
53
+
54
+
die(str, regs, (unsigned long)info->si_addr, cause);
55
+
}
56
+
57
+
return 1;
58
+
}
59
+
60
+
#define DO_ERROR_INFO(signr, str, name, sicode) \
61
+
int name(unsigned long cause, unsigned long address, struct pt_regs *regs) \
62
+
{ \
63
+
siginfo_t info = { \
64
+
.si_signo = signr, \
65
+
.si_errno = 0, \
66
+
.si_code = sicode, \
67
+
.si_addr = (void __user *)address, \
68
+
}; \
69
+
return handle_exception(cause, str, regs, &info);\
70
+
}
71
+
72
+
/*
73
+
* Entry points for exceptions NOT needing specific handling
74
+
*/
75
+
DO_ERROR_INFO(SIGILL, "Priv Op/Disabled Extn", do_privilege_fault, ILL_PRVOPC)
76
+
DO_ERROR_INFO(SIGILL, "Invalid Extn Insn", do_extension_fault, ILL_ILLOPC)
77
+
DO_ERROR_INFO(SIGILL, "Illegal Insn (or Seq)", insterror_is_error, ILL_ILLOPC)
78
+
DO_ERROR_INFO(SIGBUS, "Invalid Mem Access", do_memory_error, BUS_ADRERR)
79
+
DO_ERROR_INFO(SIGTRAP, "Breakpoint Set", trap_is_brkpt, TRAP_BRKPT)
80
+
81
+
DO_ERROR_INFO(SIGSEGV, "Misaligned Access", do_misaligned_access, SEGV_ACCERR)
82
+
83
+
/*
84
+
* Entry point for miscll errors such as Nested Exceptions
85
+
* -Duplicate TLB entry is handled seperately though
86
+
*/
87
+
void do_machine_check_fault(unsigned long cause, unsigned long address,
88
+
struct pt_regs *regs)
89
+
{
90
+
die("Machine Check Exception", regs, address, cause);
91
+
}
92
+
93
+
/*
94
+
* Entry point for traps induced by ARCompact TRAP_S <n> insn
95
+
* This is same family as TRAP0/SWI insn (use the same vector).
96
+
* The only difference being SWI insn take no operand, while TRAP_S does
97
+
* which reflects in ECR Reg as 8 bit param.
98
+
* Thus TRAP_S <n> can be used for specific purpose
99
+
* -1 used for software breakpointing (gdb)
100
+
* -2 used by kprobes
101
+
*/
102
+
void do_non_swi_trap(unsigned long cause, unsigned long address,
103
+
struct pt_regs *regs)
104
+
{
105
+
unsigned int param = cause & 0xff;
106
+
107
+
switch (param) {
108
+
case 1:
109
+
trap_is_brkpt(cause, address, regs);
110
+
break;
111
+
112
+
default:
113
+
break;
114
+
}
115
+
}
116
+
117
+
/*
118
+
* Entry point for Instruction Error Exception
119
+
*/
120
+
void do_insterror_or_kprobe(unsigned long cause,
121
+
unsigned long address,
122
+
struct pt_regs *regs)
123
+
{
124
+
insterror_is_error(cause, address, regs);
125
+
}