blob: a2fcb0fa99c37238db6f41773a9e00379da871a9 (
plain) (
blame)
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
|
/* strace.c:
* This file provides a simple, self-induced exception that can
* be caught by MicroMonitor. After catching the exception, the
* monitor will not attempt any automatic restart because the
* NO_EXCEPTION_RESTART shell variable is set at the top of
* strace_demo() below (typically this environment variable would
* be set during development in the monrc file).
*
* After the exception has completed, at the uMON> prompt type the
* "strace" command. Assuming your monitor is built with INCLUDE_STRACE
* set (refer to config.h for your monitor's port), then the output
* should be something like this...
*
* 1: uMON>app strace_demo
* 2: strace_demo
* 3: func1
* 4: func2
* 5: func3 exception now!
* 6:
* 7: EXCEPTION: 'Syscall'
* 8: Occurred near 0xa0051240 (within func3)
* 9:
* 10: uMON>strace
* 11: 0xa0051240: func3() + 0x1c
* 12: 0xa0051284: func2() + 0x28
* 13: 0xa00512b4: func1() + 0x1c
* 14: 0xa00512f4: strace_demo() + 0x30
* 15: 0xa00511d0: main() + 0x1b4
* 16: 0xa005120c: Cstart() + 0x34
* 17:
* 18: uMON>
*
* Line 1 : shows the invocation of the application 'app'.
* Lines 2-5 : show the output of the strace.c mon_printf calls.
* Lines 7-8 : show uMon catching the exception.
* Line 10 : shows the invocation of the 'strace' command.
* Lines 11-16 : show the output of strace giving the user the exact
* call-stack that caused the exception.
* Note1:
* The strace facility (INCLUDE_STRACE in config.h) in the
* monitor requires that the symbol table facility (INCLUDE_SYMTBL in
* the config.h file) also be enabled.
* Note2:
* Depending on the version of GCC you're using, you may have to specify
* -fno-omit-frame-pointer on the command line; otherwise the stack trace
* function will not work properly.
*/
#include "monlib.h"
#if CPU_IS_MIPS
#define EXCEPTION() asm("syscall 99"); /* System call */
#elif CPU_IS_68K
#define EXCEPTION() asm("trap #3"); /* Trap */
#elif CPU_IS_SH
#define EXCEPTION() asm("trap #3"); /* Trap */
#elif CPU_IS_BFIN
#define EXCEPTION() asm("excpt 5"); /* Force exception */
#elif CPU_IS_MICROBLAZE
#define EXCEPTION() asm("bralid r15,8"); /* User exception */
#elif CPU_IS_PPC
#define EXCEPTION() asm("sc"); /* System call */
#elif CPU_IS_ARM
#define EXCEPTION() asm("swi"); /* Software interrupt */
#else
#error: Must specify CPU type for exception demo.
#endif
int
func3(int i)
{
mon_printf("func3 exception now!\n");
EXCEPTION();
return(i+5);
}
int
func2(int i)
{
mon_printf("func2\n");
func3(i+3);
return(99);
}
int
func1(void)
{
mon_printf("func1\n");
func2(3);
return(88);
}
int
strace_demo(void)
{
mon_printf("strace_demo\n");
mon_setenv("NO_EXCEPTION_RESTART","TRUE");
func1();
return(77);
}
|
