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
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
|
/*
* Bedbug Functions specific to the PPC405 chip
*/
#include <common.h>
#include <command.h>
#include <linux/ctype.h>
#include <bedbug/type.h>
#include <bedbug/bedbug.h>
#include <bedbug/regs.h>
#include <bedbug/ppc.h>
#if defined(CONFIG_CMD_BEDBUG) && defined(CONFIG_4xx)
#define MAX_BREAK_POINTS 4
extern CPU_DEBUG_CTX bug_ctx;
void bedbug405_init __P ((void));
void bedbug405_do_break __P ((cmd_tbl_t *, int, int, char * const []));
void bedbug405_break_isr __P ((struct pt_regs *));
int bedbug405_find_empty __P ((void));
int bedbug405_set __P ((int, unsigned long));
int bedbug405_clear __P ((int));
/* ======================================================================
* Initialize the global bug_ctx structure for the AMCC PPC405. Clear all
* of the breakpoints.
* ====================================================================== */
void bedbug405_init (void)
{
int i;
/* -------------------------------------------------- */
bug_ctx.hw_debug_enabled = 0;
bug_ctx.stopped = 0;
bug_ctx.current_bp = 0;
bug_ctx.regs = NULL;
bug_ctx.do_break = bedbug405_do_break;
bug_ctx.break_isr = bedbug405_break_isr;
bug_ctx.find_empty = bedbug405_find_empty;
bug_ctx.set = bedbug405_set;
bug_ctx.clear = bedbug405_clear;
for (i = 1; i <= MAX_BREAK_POINTS; ++i)
(*bug_ctx.clear) (i);
puts ("BEDBUG:ready\n");
return;
} /* bedbug_init_breakpoints */
/* ======================================================================
* Set/clear/show one of the hardware breakpoints for the 405. The "off"
* string will disable a specific breakpoint. The "show" string will
* display the current breakpoints. Otherwise an address will set a
* breakpoint at that address. Setting a breakpoint uses the CPU-specific
* set routine which will assign a breakpoint number.
* ====================================================================== */
void bedbug405_do_break (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
long addr = 0; /* Address to break at */
int which_bp; /* Breakpoint number */
/* -------------------------------------------------- */
if (argc < 2) {
cmd_usage(cmdtp);
return;
}
/* Turn off a breakpoint */
if (strcmp (argv[1], "off") == 0) {
if (bug_ctx.hw_debug_enabled == 0) {
printf ("No breakpoints enabled\n");
return;
}
which_bp = simple_strtoul (argv[2], NULL, 10);
if (bug_ctx.clear)
(*bug_ctx.clear) (which_bp);
printf ("Breakpoint %d removed\n", which_bp);
return;
}
/* Show a list of breakpoints */
if (strcmp (argv[1], "show") == 0) {
for (which_bp = 1; which_bp <= MAX_BREAK_POINTS; ++which_bp) {
switch (which_bp) {
case 1:
addr = GET_IAC1 ();
break;
case 2:
addr = GET_IAC2 ();
break;
case 3:
addr = GET_IAC3 ();
break;
case 4:
addr = GET_IAC4 ();
break;
}
printf ("Breakpoint [%d]: ", which_bp);
if (addr == 0)
printf ("NOT SET\n");
else
disppc ((unsigned char *) addr, 0, 1, bedbug_puts,
F_RADHEX);
}
return;
}
/* Set a breakpoint at the address */
if (!isdigit (argv[1][0])) {
cmd_usage(cmdtp);
return;
}
addr = simple_strtoul (argv[1], NULL, 16) & 0xfffffffc;
if ((bug_ctx.set) && (which_bp = (*bug_ctx.set) (0, addr)) > 0) {
printf ("Breakpoint [%d]: ", which_bp);
disppc ((unsigned char *) addr, 0, 1, bedbug_puts, F_RADHEX);
}
return;
} /* bedbug405_do_break */
/* ======================================================================
* Handle a breakpoint. First determine which breakpoint was hit by
* looking at the DeBug Status Register (DBSR), clear the breakpoint
* and enter a mini main loop. Stay in the loop until the stopped flag
* in the debug context is cleared.
* ====================================================================== */
void bedbug405_break_isr (struct pt_regs *regs)
{
unsigned long dbsr_val; /* Value of the DBSR */
unsigned long addr = 0; /* Address stopped at */
/* -------------------------------------------------- */
dbsr_val = GET_DBSR ();
if (dbsr_val & DBSR_IA1) {
bug_ctx.current_bp = 1;
addr = GET_IAC1 ();
SET_DBSR (DBSR_IA1); /* Write a 1 to clear */
} else if (dbsr_val & DBSR_IA2) {
bug_ctx.current_bp = 2;
addr = GET_IAC2 ();
SET_DBSR (DBSR_IA2); /* Write a 1 to clear */
} else if (dbsr_val & DBSR_IA3) {
bug_ctx.current_bp = 3;
addr = GET_IAC3 ();
SET_DBSR (DBSR_IA3); /* Write a 1 to clear */
} else if (dbsr_val & DBSR_IA4) {
bug_ctx.current_bp = 4;
addr = GET_IAC4 ();
SET_DBSR (DBSR_IA4); /* Write a 1 to clear */
}
bedbug_main_loop (addr, regs);
return;
} /* bedbug405_break_isr */
/* ======================================================================
* Look through all of the hardware breakpoints available to see if one
* is unused.
* ====================================================================== */
int bedbug405_find_empty (void)
{
/* -------------------------------------------------- */
if (GET_IAC1 () == 0)
return 1;
if (GET_IAC2 () == 0)
return 2;
if (GET_IAC3 () == 0)
return 3;
if (GET_IAC4 () == 0)
return 4;
return 0;
} /* bedbug405_find_empty */
/* ======================================================================
* Set a breakpoint. If 'which_bp' is zero then find an unused breakpoint
* number, otherwise reassign the given breakpoint. If hardware debugging
* is not enabled, then turn it on via the MSR and DBCR0. Set the break
* address in the appropriate IACx register and enable proper address
* beakpoint in DBCR0.
* ====================================================================== */
int bedbug405_set (int which_bp, unsigned long addr)
{
/* -------------------------------------------------- */
/* Only look if which_bp == 0, else use which_bp */
if ((bug_ctx.find_empty) && (!which_bp) &&
(which_bp = (*bug_ctx.find_empty) ()) == 0) {
printf ("All breakpoints in use\n");
return 0;
}
if (which_bp < 1 || which_bp > MAX_BREAK_POINTS) {
printf ("Invalid break point # %d\n", which_bp);
return 0;
}
if (!bug_ctx.hw_debug_enabled) {
SET_MSR (GET_MSR () | 0x200); /* set MSR[ DE ] */
SET_DBCR0 (GET_DBCR0 () | DBCR0_IDM);
bug_ctx.hw_debug_enabled = 1;
}
switch (which_bp) {
case 1:
SET_IAC1 (addr);
SET_DBCR0 (GET_DBCR0 () | DBCR0_IA1);
break;
case 2:
SET_IAC2 (addr);
SET_DBCR0 (GET_DBCR0 () | DBCR0_IA2);
break;
case 3:
SET_IAC3 (addr);
SET_DBCR0 (GET_DBCR0 () | DBCR0_IA3);
break;
case 4:
SET_IAC4 (addr);
SET_DBCR0 (GET_DBCR0 () | DBCR0_IA4);
break;
}
return which_bp;
} /* bedbug405_set */
/* ======================================================================
* Disable a specific breakoint by setting the appropriate IACx register
* to zero and claring the instruction address breakpoint in DBCR0.
* ====================================================================== */
int bedbug405_clear (int which_bp)
{
/* -------------------------------------------------- */
if (which_bp < 1 || which_bp > MAX_BREAK_POINTS) {
printf ("Invalid break point # (%d)\n", which_bp);
return -1;
}
switch (which_bp) {
case 1:
SET_IAC1 (0);
SET_DBCR0 (GET_DBCR0 () & ~DBCR0_IA1);
break;
case 2:
SET_IAC2 (0);
SET_DBCR0 (GET_DBCR0 () & ~DBCR0_IA2);
break;
case 3:
SET_IAC3 (0);
SET_DBCR0 (GET_DBCR0 () & ~DBCR0_IA3);
break;
case 4:
SET_IAC4 (0);
SET_DBCR0 (GET_DBCR0 () & ~DBCR0_IA4);
break;
}
return 0;
} /* bedbug405_clear */
/* ====================================================================== */
#endif
|
