blob: 72450237a0f418e0a41552cbdefd7943545add78 [file] [log] [blame]
Jason Wessele8d31c22008-03-07 16:34:17 -06001/*
2 * kgdbts is a test suite for kgdb for the sole purpose of validating
3 * that key pieces of the kgdb internals are working properly such as
4 * HW/SW breakpoints, single stepping, and NMI.
5 *
6 * Created by: Jason Wessel <jason.wessel@windriver.com>
7 *
8 * Copyright (c) 2008 Wind River Systems, Inc.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
17 * See the GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23/* Information about the kgdb test suite.
24 * -------------------------------------
25 *
26 * The kgdb test suite is designed as a KGDB I/O module which
27 * simulates the communications that a debugger would have with kgdb.
28 * The tests are broken up in to a line by line and referenced here as
29 * a "get" which is kgdb requesting input and "put" which is kgdb
30 * sending a response.
31 *
32 * The kgdb suite can be invoked from the kernel command line
33 * arguments system or executed dynamically at run time. The test
34 * suite uses the variable "kgdbts" to obtain the information about
35 * which tests to run and to configure the verbosity level. The
36 * following are the various characters you can use with the kgdbts=
37 * line:
38 *
39 * When using the "kgdbts=" you only choose one of the following core
40 * test types:
41 * A = Run all the core tests silently
42 * V1 = Run all the core tests with minimal output
43 * V2 = Run all the core tests in debug mode
44 *
45 * You can also specify optional tests:
46 * N## = Go to sleep with interrupts of for ## seconds
47 * to test the HW NMI watchdog
48 * F## = Break at do_fork for ## iterations
49 * S## = Break at sys_open for ## iterations
Jason Wessel7cfcd9852008-04-24 16:57:23 -050050 * I## = Run the single step test ## iterations
Jason Wessele8d31c22008-03-07 16:34:17 -060051 *
52 * NOTE: that the do_fork and sys_open tests are mutually exclusive.
53 *
54 * To invoke the kgdb test suite from boot you use a kernel start
55 * argument as follows:
56 * kgdbts=V1 kgdbwait
57 * Or if you wanted to perform the NMI test for 6 seconds and do_fork
58 * test for 100 forks, you could use:
59 * kgdbts=V1N6F100 kgdbwait
60 *
61 * The test suite can also be invoked at run time with:
62 * echo kgdbts=V1N6F100 > /sys/module/kgdbts/parameters/kgdbts
63 * Or as another example:
64 * echo kgdbts=V2 > /sys/module/kgdbts/parameters/kgdbts
65 *
66 * When developing a new kgdb arch specific implementation or
67 * using these tests for the purpose of regression testing,
68 * several invocations are required.
69 *
70 * 1) Boot with the test suite enabled by using the kernel arguments
71 * "kgdbts=V1F100 kgdbwait"
72 * ## If kgdb arch specific implementation has NMI use
73 * "kgdbts=V1N6F100
74 *
75 * 2) After the system boot run the basic test.
76 * echo kgdbts=V1 > /sys/module/kgdbts/parameters/kgdbts
77 *
78 * 3) Run the concurrency tests. It is best to use n+1
79 * while loops where n is the number of cpus you have
80 * in your system. The example below uses only two
81 * loops.
82 *
83 * ## This tests break points on sys_open
84 * while [ 1 ] ; do find / > /dev/null 2>&1 ; done &
85 * while [ 1 ] ; do find / > /dev/null 2>&1 ; done &
86 * echo kgdbts=V1S10000 > /sys/module/kgdbts/parameters/kgdbts
87 * fg # and hit control-c
88 * fg # and hit control-c
89 * ## This tests break points on do_fork
90 * while [ 1 ] ; do date > /dev/null ; done &
91 * while [ 1 ] ; do date > /dev/null ; done &
92 * echo kgdbts=V1F1000 > /sys/module/kgdbts/parameters/kgdbts
93 * fg # and hit control-c
94 *
95 */
96
97#include <linux/kernel.h>
98#include <linux/kgdb.h>
99#include <linux/ctype.h>
100#include <linux/uaccess.h>
101#include <linux/syscalls.h>
102#include <linux/nmi.h>
103#include <linux/delay.h>
104#include <linux/kthread.h>
Jason Wessele8d31c22008-03-07 16:34:17 -0600105
106#define v1printk(a...) do { \
107 if (verbose) \
108 printk(KERN_INFO a); \
109 } while (0)
110#define v2printk(a...) do { \
111 if (verbose > 1) \
112 printk(KERN_INFO a); \
113 touch_nmi_watchdog(); \
114 } while (0)
Jason Wessel974460c2008-03-20 13:43:44 -0500115#define eprintk(a...) do { \
116 printk(KERN_ERR a); \
117 WARN_ON(1); \
118 } while (0)
Jason Wessele8d31c22008-03-07 16:34:17 -0600119#define MAX_CONFIG_LEN 40
120
Jason Wessele8d31c22008-03-07 16:34:17 -0600121static struct kgdb_io kgdbts_io_ops;
122static char get_buf[BUFMAX];
123static int get_buf_cnt;
124static char put_buf[BUFMAX];
125static int put_buf_cnt;
126static char scratch_buf[BUFMAX];
127static int verbose;
128static int repeat_test;
129static int test_complete;
130static int send_ack;
131static int final_ack;
Jason Wesselb33cb812008-05-28 12:49:57 -0500132static int force_hwbrks;
133static int hwbreaks_ok;
Jason Wessele8d31c22008-03-07 16:34:17 -0600134static int hw_break_val;
135static int hw_break_val2;
David S. Miller4d7ffa42008-04-29 01:36:14 -0700136#if defined(CONFIG_ARM) || defined(CONFIG_MIPS) || defined(CONFIG_SPARC)
Jason Wessele8d31c22008-03-07 16:34:17 -0600137static int arch_needs_sstep_emulation = 1;
138#else
139static int arch_needs_sstep_emulation;
140#endif
141static unsigned long sstep_addr;
142static int sstep_state;
143
144/* Storage for the registers, in GDB format. */
145static unsigned long kgdbts_gdb_regs[(NUMREGBYTES +
146 sizeof(unsigned long) - 1) /
147 sizeof(unsigned long)];
148static struct pt_regs kgdbts_regs;
149
150/* -1 = init not run yet, 0 = unconfigured, 1 = configured. */
151static int configured = -1;
152
Jason Wessel974460c2008-03-20 13:43:44 -0500153#ifdef CONFIG_KGDB_TESTS_BOOT_STRING
154static char config[MAX_CONFIG_LEN] = CONFIG_KGDB_TESTS_BOOT_STRING;
155#else
Jason Wessele8d31c22008-03-07 16:34:17 -0600156static char config[MAX_CONFIG_LEN];
Jason Wessel974460c2008-03-20 13:43:44 -0500157#endif
Jason Wessele8d31c22008-03-07 16:34:17 -0600158static struct kparam_string kps = {
159 .string = config,
160 .maxlen = MAX_CONFIG_LEN,
161};
162
163static void fill_get_buf(char *buf);
164
165struct test_struct {
166 char *get;
167 char *put;
168 void (*get_handler)(char *);
169 int (*put_handler)(char *, char *);
170};
171
172struct test_state {
173 char *name;
174 struct test_struct *tst;
175 int idx;
176 int (*run_test) (int, int);
177 int (*validate_put) (char *);
178};
179
180static struct test_state ts;
181
182static int kgdbts_unreg_thread(void *ptr)
183{
184 /* Wait until the tests are complete and then ungresiter the I/O
185 * driver.
186 */
187 while (!final_ack)
188 msleep_interruptible(1500);
189
190 if (configured)
191 kgdb_unregister_io_module(&kgdbts_io_ops);
192 configured = 0;
193
194 return 0;
195}
196
197/* This is noinline such that it can be used for a single location to
198 * place a breakpoint
199 */
200static noinline void kgdbts_break_test(void)
201{
202 v2printk("kgdbts: breakpoint complete\n");
203}
204
205/* Lookup symbol info in the kernel */
206static unsigned long lookup_addr(char *arg)
207{
208 unsigned long addr = 0;
209
210 if (!strcmp(arg, "kgdbts_break_test"))
211 addr = (unsigned long)kgdbts_break_test;
212 else if (!strcmp(arg, "sys_open"))
213 addr = (unsigned long)sys_open;
214 else if (!strcmp(arg, "do_fork"))
215 addr = (unsigned long)do_fork;
216 else if (!strcmp(arg, "hw_break_val"))
217 addr = (unsigned long)&hw_break_val;
218 return addr;
219}
220
221static void break_helper(char *bp_type, char *arg, unsigned long vaddr)
222{
223 unsigned long addr;
224
225 if (arg)
226 addr = lookup_addr(arg);
227 else
228 addr = vaddr;
229
230 sprintf(scratch_buf, "%s,%lx,%i", bp_type, addr,
231 BREAK_INSTR_SIZE);
232 fill_get_buf(scratch_buf);
233}
234
235static void sw_break(char *arg)
236{
Jason Wesselb33cb812008-05-28 12:49:57 -0500237 break_helper(force_hwbrks ? "Z1" : "Z0", arg, 0);
Jason Wessele8d31c22008-03-07 16:34:17 -0600238}
239
240static void sw_rem_break(char *arg)
241{
Jason Wesselb33cb812008-05-28 12:49:57 -0500242 break_helper(force_hwbrks ? "z1" : "z0", arg, 0);
Jason Wessele8d31c22008-03-07 16:34:17 -0600243}
244
245static void hw_break(char *arg)
246{
247 break_helper("Z1", arg, 0);
248}
249
250static void hw_rem_break(char *arg)
251{
252 break_helper("z1", arg, 0);
253}
254
255static void hw_write_break(char *arg)
256{
257 break_helper("Z2", arg, 0);
258}
259
260static void hw_rem_write_break(char *arg)
261{
262 break_helper("z2", arg, 0);
263}
264
265static void hw_access_break(char *arg)
266{
267 break_helper("Z4", arg, 0);
268}
269
270static void hw_rem_access_break(char *arg)
271{
272 break_helper("z4", arg, 0);
273}
274
275static void hw_break_val_access(void)
276{
277 hw_break_val2 = hw_break_val;
278}
279
280static void hw_break_val_write(void)
281{
282 hw_break_val++;
283}
284
285static int check_and_rewind_pc(char *put_str, char *arg)
286{
287 unsigned long addr = lookup_addr(arg);
288 int offset = 0;
289
290 kgdb_hex2mem(&put_str[1], (char *)kgdbts_gdb_regs,
291 NUMREGBYTES);
292 gdb_regs_to_pt_regs(kgdbts_gdb_regs, &kgdbts_regs);
293 v2printk("Stopped at IP: %lx\n", instruction_pointer(&kgdbts_regs));
294#ifdef CONFIG_X86
295 /* On x86 a breakpoint stop requires it to be decremented */
296 if (addr + 1 == kgdbts_regs.ip)
297 offset = -1;
Jason Wesselcad08ac2010-04-02 11:31:35 -0500298#elif defined(CONFIG_SUPERH)
299 /* On SUPERH a breakpoint stop requires it to be decremented */
300 if (addr + 2 == kgdbts_regs.pc)
301 offset = -2;
Jason Wessele8d31c22008-03-07 16:34:17 -0600302#endif
303 if (strcmp(arg, "silent") &&
304 instruction_pointer(&kgdbts_regs) + offset != addr) {
Jason Wessel974460c2008-03-20 13:43:44 -0500305 eprintk("kgdbts: BP mismatch %lx expected %lx\n",
Jason Wessele8d31c22008-03-07 16:34:17 -0600306 instruction_pointer(&kgdbts_regs) + offset, addr);
307 return 1;
308 }
309#ifdef CONFIG_X86
310 /* On x86 adjust the instruction pointer if needed */
311 kgdbts_regs.ip += offset;
Jason Wesselcad08ac2010-04-02 11:31:35 -0500312#elif defined(CONFIG_SUPERH)
313 kgdbts_regs.pc += offset;
Jason Wessele8d31c22008-03-07 16:34:17 -0600314#endif
315 return 0;
316}
317
318static int check_single_step(char *put_str, char *arg)
319{
320 unsigned long addr = lookup_addr(arg);
321 /*
322 * From an arch indepent point of view the instruction pointer
323 * should be on a different instruction
324 */
325 kgdb_hex2mem(&put_str[1], (char *)kgdbts_gdb_regs,
326 NUMREGBYTES);
327 gdb_regs_to_pt_regs(kgdbts_gdb_regs, &kgdbts_regs);
328 v2printk("Singlestep stopped at IP: %lx\n",
329 instruction_pointer(&kgdbts_regs));
330 if (instruction_pointer(&kgdbts_regs) == addr) {
Jason Wessel974460c2008-03-20 13:43:44 -0500331 eprintk("kgdbts: SingleStep failed at %lx\n",
Jason Wessele8d31c22008-03-07 16:34:17 -0600332 instruction_pointer(&kgdbts_regs));
333 return 1;
334 }
335
336 return 0;
337}
338
339static void write_regs(char *arg)
340{
341 memset(scratch_buf, 0, sizeof(scratch_buf));
342 scratch_buf[0] = 'G';
343 pt_regs_to_gdb_regs(kgdbts_gdb_regs, &kgdbts_regs);
344 kgdb_mem2hex((char *)kgdbts_gdb_regs, &scratch_buf[1], NUMREGBYTES);
345 fill_get_buf(scratch_buf);
346}
347
348static void skip_back_repeat_test(char *arg)
349{
350 int go_back = simple_strtol(arg, NULL, 10);
351
352 repeat_test--;
353 if (repeat_test <= 0)
354 ts.idx++;
355 else
356 ts.idx -= go_back;
357 fill_get_buf(ts.tst[ts.idx].get);
358}
359
360static int got_break(char *put_str, char *arg)
361{
362 test_complete = 1;
363 if (!strncmp(put_str+1, arg, 2)) {
364 if (!strncmp(arg, "T0", 2))
365 test_complete = 2;
366 return 0;
367 }
368 return 1;
369}
370
371static void emul_sstep_get(char *arg)
372{
373 if (!arch_needs_sstep_emulation) {
374 fill_get_buf(arg);
375 return;
376 }
377 switch (sstep_state) {
378 case 0:
379 v2printk("Emulate single step\n");
380 /* Start by looking at the current PC */
381 fill_get_buf("g");
382 break;
383 case 1:
384 /* set breakpoint */
Harvey Harrison001fddf2008-04-24 16:57:23 -0500385 break_helper("Z0", NULL, sstep_addr);
Jason Wessele8d31c22008-03-07 16:34:17 -0600386 break;
387 case 2:
388 /* Continue */
389 fill_get_buf("c");
390 break;
391 case 3:
392 /* Clear breakpoint */
Harvey Harrison001fddf2008-04-24 16:57:23 -0500393 break_helper("z0", NULL, sstep_addr);
Jason Wessele8d31c22008-03-07 16:34:17 -0600394 break;
395 default:
Jason Wessel974460c2008-03-20 13:43:44 -0500396 eprintk("kgdbts: ERROR failed sstep get emulation\n");
Jason Wessele8d31c22008-03-07 16:34:17 -0600397 }
398 sstep_state++;
399}
400
401static int emul_sstep_put(char *put_str, char *arg)
402{
403 if (!arch_needs_sstep_emulation) {
404 if (!strncmp(put_str+1, arg, 2))
405 return 0;
406 return 1;
407 }
408 switch (sstep_state) {
409 case 1:
410 /* validate the "g" packet to get the IP */
411 kgdb_hex2mem(&put_str[1], (char *)kgdbts_gdb_regs,
412 NUMREGBYTES);
413 gdb_regs_to_pt_regs(kgdbts_gdb_regs, &kgdbts_regs);
414 v2printk("Stopped at IP: %lx\n",
415 instruction_pointer(&kgdbts_regs));
416 /* Want to stop at IP + break instruction size by default */
417 sstep_addr = instruction_pointer(&kgdbts_regs) +
418 BREAK_INSTR_SIZE;
419 break;
420 case 2:
421 if (strncmp(put_str, "$OK", 3)) {
Jason Wessel974460c2008-03-20 13:43:44 -0500422 eprintk("kgdbts: failed sstep break set\n");
Jason Wessele8d31c22008-03-07 16:34:17 -0600423 return 1;
424 }
425 break;
426 case 3:
427 if (strncmp(put_str, "$T0", 3)) {
Jason Wessel974460c2008-03-20 13:43:44 -0500428 eprintk("kgdbts: failed continue sstep\n");
Jason Wessele8d31c22008-03-07 16:34:17 -0600429 return 1;
430 }
431 break;
432 case 4:
433 if (strncmp(put_str, "$OK", 3)) {
Jason Wessel974460c2008-03-20 13:43:44 -0500434 eprintk("kgdbts: failed sstep break unset\n");
Jason Wessele8d31c22008-03-07 16:34:17 -0600435 return 1;
436 }
437 /* Single step is complete so continue on! */
438 sstep_state = 0;
439 return 0;
440 default:
Jason Wessel974460c2008-03-20 13:43:44 -0500441 eprintk("kgdbts: ERROR failed sstep put emulation\n");
Jason Wessele8d31c22008-03-07 16:34:17 -0600442 }
443
444 /* Continue on the same test line until emulation is complete */
445 ts.idx--;
446 return 0;
447}
448
449static int final_ack_set(char *put_str, char *arg)
450{
451 if (strncmp(put_str+1, arg, 2))
452 return 1;
453 final_ack = 1;
454 return 0;
455}
456/*
457 * Test to plant a breakpoint and detach, which should clear out the
458 * breakpoint and restore the original instruction.
459 */
460static struct test_struct plant_and_detach_test[] = {
461 { "?", "S0*" }, /* Clear break points */
462 { "kgdbts_break_test", "OK", sw_break, }, /* set sw breakpoint */
463 { "D", "OK" }, /* Detach */
464 { "", "" },
465};
466
467/*
468 * Simple test to write in a software breakpoint, check for the
469 * correct stop location and detach.
470 */
471static struct test_struct sw_breakpoint_test[] = {
472 { "?", "S0*" }, /* Clear break points */
473 { "kgdbts_break_test", "OK", sw_break, }, /* set sw breakpoint */
474 { "c", "T0*", }, /* Continue */
Harvey Harrison001fddf2008-04-24 16:57:23 -0500475 { "g", "kgdbts_break_test", NULL, check_and_rewind_pc },
Jason Wessele8d31c22008-03-07 16:34:17 -0600476 { "write", "OK", write_regs },
477 { "kgdbts_break_test", "OK", sw_rem_break }, /*remove breakpoint */
478 { "D", "OK" }, /* Detach */
Harvey Harrison001fddf2008-04-24 16:57:23 -0500479 { "D", "OK", NULL, got_break }, /* On success we made it here */
Jason Wessele8d31c22008-03-07 16:34:17 -0600480 { "", "" },
481};
482
483/*
484 * Test a known bad memory read location to test the fault handler and
485 * read bytes 1-8 at the bad address
486 */
487static struct test_struct bad_read_test[] = {
488 { "?", "S0*" }, /* Clear break points */
489 { "m0,1", "E*" }, /* read 1 byte at address 1 */
490 { "m0,2", "E*" }, /* read 1 byte at address 2 */
491 { "m0,3", "E*" }, /* read 1 byte at address 3 */
492 { "m0,4", "E*" }, /* read 1 byte at address 4 */
493 { "m0,5", "E*" }, /* read 1 byte at address 5 */
494 { "m0,6", "E*" }, /* read 1 byte at address 6 */
495 { "m0,7", "E*" }, /* read 1 byte at address 7 */
496 { "m0,8", "E*" }, /* read 1 byte at address 8 */
497 { "D", "OK" }, /* Detach which removes all breakpoints and continues */
498 { "", "" },
499};
500
501/*
502 * Test for hitting a breakpoint, remove it, single step, plant it
503 * again and detach.
504 */
505static struct test_struct singlestep_break_test[] = {
506 { "?", "S0*" }, /* Clear break points */
507 { "kgdbts_break_test", "OK", sw_break, }, /* set sw breakpoint */
508 { "c", "T0*", }, /* Continue */
Harvey Harrison001fddf2008-04-24 16:57:23 -0500509 { "g", "kgdbts_break_test", NULL, check_and_rewind_pc },
Jason Wessele8d31c22008-03-07 16:34:17 -0600510 { "write", "OK", write_regs }, /* Write registers */
511 { "kgdbts_break_test", "OK", sw_rem_break }, /*remove breakpoint */
512 { "s", "T0*", emul_sstep_get, emul_sstep_put }, /* Single step */
Harvey Harrison001fddf2008-04-24 16:57:23 -0500513 { "g", "kgdbts_break_test", NULL, check_single_step },
Jason Wessele8d31c22008-03-07 16:34:17 -0600514 { "kgdbts_break_test", "OK", sw_break, }, /* set sw breakpoint */
515 { "c", "T0*", }, /* Continue */
Harvey Harrison001fddf2008-04-24 16:57:23 -0500516 { "g", "kgdbts_break_test", NULL, check_and_rewind_pc },
Jason Wessele8d31c22008-03-07 16:34:17 -0600517 { "write", "OK", write_regs }, /* Write registers */
518 { "D", "OK" }, /* Remove all breakpoints and continues */
519 { "", "" },
520};
521
522/*
523 * Test for hitting a breakpoint at do_fork for what ever the number
524 * of iterations required by the variable repeat_test.
525 */
526static struct test_struct do_fork_test[] = {
527 { "?", "S0*" }, /* Clear break points */
528 { "do_fork", "OK", sw_break, }, /* set sw breakpoint */
529 { "c", "T0*", }, /* Continue */
Harvey Harrison001fddf2008-04-24 16:57:23 -0500530 { "g", "do_fork", NULL, check_and_rewind_pc }, /* check location */
Jason Wessele8d31c22008-03-07 16:34:17 -0600531 { "write", "OK", write_regs }, /* Write registers */
532 { "do_fork", "OK", sw_rem_break }, /*remove breakpoint */
533 { "s", "T0*", emul_sstep_get, emul_sstep_put }, /* Single step */
Harvey Harrison001fddf2008-04-24 16:57:23 -0500534 { "g", "do_fork", NULL, check_single_step },
Jason Wessele8d31c22008-03-07 16:34:17 -0600535 { "do_fork", "OK", sw_break, }, /* set sw breakpoint */
536 { "7", "T0*", skip_back_repeat_test }, /* Loop based on repeat_test */
Harvey Harrison001fddf2008-04-24 16:57:23 -0500537 { "D", "OK", NULL, final_ack_set }, /* detach and unregister I/O */
Jason Wessele8d31c22008-03-07 16:34:17 -0600538 { "", "" },
539};
540
541/* Test for hitting a breakpoint at sys_open for what ever the number
542 * of iterations required by the variable repeat_test.
543 */
544static struct test_struct sys_open_test[] = {
545 { "?", "S0*" }, /* Clear break points */
546 { "sys_open", "OK", sw_break, }, /* set sw breakpoint */
547 { "c", "T0*", }, /* Continue */
Harvey Harrison001fddf2008-04-24 16:57:23 -0500548 { "g", "sys_open", NULL, check_and_rewind_pc }, /* check location */
Jason Wessele8d31c22008-03-07 16:34:17 -0600549 { "write", "OK", write_regs }, /* Write registers */
550 { "sys_open", "OK", sw_rem_break }, /*remove breakpoint */
551 { "s", "T0*", emul_sstep_get, emul_sstep_put }, /* Single step */
Harvey Harrison001fddf2008-04-24 16:57:23 -0500552 { "g", "sys_open", NULL, check_single_step },
Jason Wessele8d31c22008-03-07 16:34:17 -0600553 { "sys_open", "OK", sw_break, }, /* set sw breakpoint */
554 { "7", "T0*", skip_back_repeat_test }, /* Loop based on repeat_test */
Harvey Harrison001fddf2008-04-24 16:57:23 -0500555 { "D", "OK", NULL, final_ack_set }, /* detach and unregister I/O */
Jason Wessele8d31c22008-03-07 16:34:17 -0600556 { "", "" },
557};
558
559/*
560 * Test for hitting a simple hw breakpoint
561 */
562static struct test_struct hw_breakpoint_test[] = {
563 { "?", "S0*" }, /* Clear break points */
564 { "kgdbts_break_test", "OK", hw_break, }, /* set hw breakpoint */
565 { "c", "T0*", }, /* Continue */
Harvey Harrison001fddf2008-04-24 16:57:23 -0500566 { "g", "kgdbts_break_test", NULL, check_and_rewind_pc },
Jason Wessele8d31c22008-03-07 16:34:17 -0600567 { "write", "OK", write_regs },
568 { "kgdbts_break_test", "OK", hw_rem_break }, /*remove breakpoint */
569 { "D", "OK" }, /* Detach */
Harvey Harrison001fddf2008-04-24 16:57:23 -0500570 { "D", "OK", NULL, got_break }, /* On success we made it here */
Jason Wessele8d31c22008-03-07 16:34:17 -0600571 { "", "" },
572};
573
574/*
575 * Test for hitting a hw write breakpoint
576 */
577static struct test_struct hw_write_break_test[] = {
578 { "?", "S0*" }, /* Clear break points */
579 { "hw_break_val", "OK", hw_write_break, }, /* set hw breakpoint */
Harvey Harrison001fddf2008-04-24 16:57:23 -0500580 { "c", "T0*", NULL, got_break }, /* Continue */
581 { "g", "silent", NULL, check_and_rewind_pc },
Jason Wessele8d31c22008-03-07 16:34:17 -0600582 { "write", "OK", write_regs },
583 { "hw_break_val", "OK", hw_rem_write_break }, /*remove breakpoint */
584 { "D", "OK" }, /* Detach */
Harvey Harrison001fddf2008-04-24 16:57:23 -0500585 { "D", "OK", NULL, got_break }, /* On success we made it here */
Jason Wessele8d31c22008-03-07 16:34:17 -0600586 { "", "" },
587};
588
589/*
590 * Test for hitting a hw access breakpoint
591 */
592static struct test_struct hw_access_break_test[] = {
593 { "?", "S0*" }, /* Clear break points */
594 { "hw_break_val", "OK", hw_access_break, }, /* set hw breakpoint */
Harvey Harrison001fddf2008-04-24 16:57:23 -0500595 { "c", "T0*", NULL, got_break }, /* Continue */
596 { "g", "silent", NULL, check_and_rewind_pc },
Jason Wessele8d31c22008-03-07 16:34:17 -0600597 { "write", "OK", write_regs },
598 { "hw_break_val", "OK", hw_rem_access_break }, /*remove breakpoint */
599 { "D", "OK" }, /* Detach */
Harvey Harrison001fddf2008-04-24 16:57:23 -0500600 { "D", "OK", NULL, got_break }, /* On success we made it here */
Jason Wessele8d31c22008-03-07 16:34:17 -0600601 { "", "" },
602};
603
604/*
605 * Test for hitting a hw access breakpoint
606 */
607static struct test_struct nmi_sleep_test[] = {
608 { "?", "S0*" }, /* Clear break points */
Harvey Harrison001fddf2008-04-24 16:57:23 -0500609 { "c", "T0*", NULL, got_break }, /* Continue */
Jason Wessele8d31c22008-03-07 16:34:17 -0600610 { "D", "OK" }, /* Detach */
Harvey Harrison001fddf2008-04-24 16:57:23 -0500611 { "D", "OK", NULL, got_break }, /* On success we made it here */
Jason Wessele8d31c22008-03-07 16:34:17 -0600612 { "", "" },
613};
614
615static void fill_get_buf(char *buf)
616{
617 unsigned char checksum = 0;
618 int count = 0;
619 char ch;
620
621 strcpy(get_buf, "$");
622 strcat(get_buf, buf);
623 while ((ch = buf[count])) {
624 checksum += ch;
625 count++;
626 }
627 strcat(get_buf, "#");
Harvey Harrison827e6092008-05-28 12:49:56 -0500628 get_buf[count + 2] = hex_asc_hi(checksum);
629 get_buf[count + 3] = hex_asc_lo(checksum);
Jason Wessele8d31c22008-03-07 16:34:17 -0600630 get_buf[count + 4] = '\0';
631 v2printk("get%i: %s\n", ts.idx, get_buf);
632}
633
634static int validate_simple_test(char *put_str)
635{
636 char *chk_str;
637
638 if (ts.tst[ts.idx].put_handler)
639 return ts.tst[ts.idx].put_handler(put_str,
640 ts.tst[ts.idx].put);
641
642 chk_str = ts.tst[ts.idx].put;
643 if (*put_str == '$')
644 put_str++;
645
646 while (*chk_str != '\0' && *put_str != '\0') {
647 /* If someone does a * to match the rest of the string, allow
648 * it, or stop if the recieved string is complete.
649 */
650 if (*put_str == '#' || *chk_str == '*')
651 return 0;
652 if (*put_str != *chk_str)
653 return 1;
654
655 chk_str++;
656 put_str++;
657 }
658 if (*chk_str == '\0' && (*put_str == '\0' || *put_str == '#'))
659 return 0;
660
661 return 1;
662}
663
664static int run_simple_test(int is_get_char, int chr)
665{
666 int ret = 0;
667 if (is_get_char) {
668 /* Send an ACK on the get if a prior put completed and set the
669 * send ack variable
670 */
671 if (send_ack) {
672 send_ack = 0;
673 return '+';
674 }
675 /* On the first get char, fill the transmit buffer and then
676 * take from the get_string.
677 */
678 if (get_buf_cnt == 0) {
679 if (ts.tst[ts.idx].get_handler)
680 ts.tst[ts.idx].get_handler(ts.tst[ts.idx].get);
681 else
682 fill_get_buf(ts.tst[ts.idx].get);
683 }
684
685 if (get_buf[get_buf_cnt] == '\0') {
Jason Wessel974460c2008-03-20 13:43:44 -0500686 eprintk("kgdbts: ERROR GET: EOB on '%s' at %i\n",
Jason Wessele8d31c22008-03-07 16:34:17 -0600687 ts.name, ts.idx);
688 get_buf_cnt = 0;
689 fill_get_buf("D");
690 }
691 ret = get_buf[get_buf_cnt];
692 get_buf_cnt++;
693 return ret;
694 }
695
696 /* This callback is a put char which is when kgdb sends data to
697 * this I/O module.
698 */
699 if (ts.tst[ts.idx].get[0] == '\0' &&
700 ts.tst[ts.idx].put[0] == '\0') {
Jason Wessel974460c2008-03-20 13:43:44 -0500701 eprintk("kgdbts: ERROR: beyond end of test on"
Jason Wessele8d31c22008-03-07 16:34:17 -0600702 " '%s' line %i\n", ts.name, ts.idx);
703 return 0;
704 }
705
706 if (put_buf_cnt >= BUFMAX) {
Jason Wessel974460c2008-03-20 13:43:44 -0500707 eprintk("kgdbts: ERROR: put buffer overflow on"
Jason Wessele8d31c22008-03-07 16:34:17 -0600708 " '%s' line %i\n", ts.name, ts.idx);
709 put_buf_cnt = 0;
710 return 0;
711 }
712 /* Ignore everything until the first valid packet start '$' */
713 if (put_buf_cnt == 0 && chr != '$')
714 return 0;
715
716 put_buf[put_buf_cnt] = chr;
717 put_buf_cnt++;
718
719 /* End of packet == #XX so look for the '#' */
720 if (put_buf_cnt > 3 && put_buf[put_buf_cnt - 3] == '#') {
Roel Kluinb4f1b672009-12-11 08:43:15 -0600721 if (put_buf_cnt >= BUFMAX) {
722 eprintk("kgdbts: ERROR: put buffer overflow on"
723 " '%s' line %i\n", ts.name, ts.idx);
724 put_buf_cnt = 0;
725 return 0;
726 }
Jason Wessele8d31c22008-03-07 16:34:17 -0600727 put_buf[put_buf_cnt] = '\0';
728 v2printk("put%i: %s\n", ts.idx, put_buf);
729 /* Trigger check here */
730 if (ts.validate_put && ts.validate_put(put_buf)) {
Jason Wessel974460c2008-03-20 13:43:44 -0500731 eprintk("kgdbts: ERROR PUT: end of test "
Jason Wessele8d31c22008-03-07 16:34:17 -0600732 "buffer on '%s' line %i expected %s got %s\n",
733 ts.name, ts.idx, ts.tst[ts.idx].put, put_buf);
734 }
735 ts.idx++;
736 put_buf_cnt = 0;
737 get_buf_cnt = 0;
738 send_ack = 1;
739 }
740 return 0;
741}
742
743static void init_simple_test(void)
744{
745 memset(&ts, 0, sizeof(ts));
746 ts.run_test = run_simple_test;
747 ts.validate_put = validate_simple_test;
748}
749
750static void run_plant_and_detach_test(int is_early)
751{
752 char before[BREAK_INSTR_SIZE];
753 char after[BREAK_INSTR_SIZE];
754
755 probe_kernel_read(before, (char *)kgdbts_break_test,
756 BREAK_INSTR_SIZE);
757 init_simple_test();
758 ts.tst = plant_and_detach_test;
759 ts.name = "plant_and_detach_test";
760 /* Activate test with initial breakpoint */
761 if (!is_early)
762 kgdb_breakpoint();
763 probe_kernel_read(after, (char *)kgdbts_break_test,
764 BREAK_INSTR_SIZE);
765 if (memcmp(before, after, BREAK_INSTR_SIZE)) {
766 printk(KERN_CRIT "kgdbts: ERROR kgdb corrupted memory\n");
767 panic("kgdb memory corruption");
768 }
769
770 /* complete the detach test */
771 if (!is_early)
772 kgdbts_break_test();
773}
774
775static void run_breakpoint_test(int is_hw_breakpoint)
776{
777 test_complete = 0;
778 init_simple_test();
779 if (is_hw_breakpoint) {
780 ts.tst = hw_breakpoint_test;
781 ts.name = "hw_breakpoint_test";
782 } else {
783 ts.tst = sw_breakpoint_test;
784 ts.name = "sw_breakpoint_test";
785 }
786 /* Activate test with initial breakpoint */
787 kgdb_breakpoint();
788 /* run code with the break point in it */
789 kgdbts_break_test();
790 kgdb_breakpoint();
791
792 if (test_complete)
793 return;
794
Jason Wessel974460c2008-03-20 13:43:44 -0500795 eprintk("kgdbts: ERROR %s test failed\n", ts.name);
Jason Wesselb33cb812008-05-28 12:49:57 -0500796 if (is_hw_breakpoint)
797 hwbreaks_ok = 0;
Jason Wessele8d31c22008-03-07 16:34:17 -0600798}
799
800static void run_hw_break_test(int is_write_test)
801{
802 test_complete = 0;
803 init_simple_test();
804 if (is_write_test) {
805 ts.tst = hw_write_break_test;
806 ts.name = "hw_write_break_test";
807 } else {
808 ts.tst = hw_access_break_test;
809 ts.name = "hw_access_break_test";
810 }
811 /* Activate test with initial breakpoint */
812 kgdb_breakpoint();
813 hw_break_val_access();
814 if (is_write_test) {
Jason Wesselb33cb812008-05-28 12:49:57 -0500815 if (test_complete == 2) {
Jason Wessel974460c2008-03-20 13:43:44 -0500816 eprintk("kgdbts: ERROR %s broke on access\n",
Jason Wessele8d31c22008-03-07 16:34:17 -0600817 ts.name);
Jason Wesselb33cb812008-05-28 12:49:57 -0500818 hwbreaks_ok = 0;
819 }
Jason Wessele8d31c22008-03-07 16:34:17 -0600820 hw_break_val_write();
821 }
822 kgdb_breakpoint();
823
824 if (test_complete == 1)
825 return;
826
Jason Wessel974460c2008-03-20 13:43:44 -0500827 eprintk("kgdbts: ERROR %s test failed\n", ts.name);
Jason Wesselb33cb812008-05-28 12:49:57 -0500828 hwbreaks_ok = 0;
Jason Wessele8d31c22008-03-07 16:34:17 -0600829}
830
831static void run_nmi_sleep_test(int nmi_sleep)
832{
833 unsigned long flags;
834
835 init_simple_test();
836 ts.tst = nmi_sleep_test;
837 ts.name = "nmi_sleep_test";
838 /* Activate test with initial breakpoint */
839 kgdb_breakpoint();
840 local_irq_save(flags);
841 mdelay(nmi_sleep*1000);
842 touch_nmi_watchdog();
843 local_irq_restore(flags);
844 if (test_complete != 2)
Jason Wessel974460c2008-03-20 13:43:44 -0500845 eprintk("kgdbts: ERROR nmi_test did not hit nmi\n");
Jason Wessele8d31c22008-03-07 16:34:17 -0600846 kgdb_breakpoint();
847 if (test_complete == 1)
848 return;
849
Jason Wessel974460c2008-03-20 13:43:44 -0500850 eprintk("kgdbts: ERROR %s test failed\n", ts.name);
Jason Wessele8d31c22008-03-07 16:34:17 -0600851}
852
853static void run_bad_read_test(void)
854{
855 init_simple_test();
856 ts.tst = bad_read_test;
857 ts.name = "bad_read_test";
858 /* Activate test with initial breakpoint */
859 kgdb_breakpoint();
860}
861
862static void run_do_fork_test(void)
863{
864 init_simple_test();
865 ts.tst = do_fork_test;
866 ts.name = "do_fork_test";
867 /* Activate test with initial breakpoint */
868 kgdb_breakpoint();
869}
870
871static void run_sys_open_test(void)
872{
873 init_simple_test();
874 ts.tst = sys_open_test;
875 ts.name = "sys_open_test";
876 /* Activate test with initial breakpoint */
877 kgdb_breakpoint();
878}
879
880static void run_singlestep_break_test(void)
881{
882 init_simple_test();
883 ts.tst = singlestep_break_test;
884 ts.name = "singlestep_breakpoint_test";
885 /* Activate test with initial breakpoint */
886 kgdb_breakpoint();
887 kgdbts_break_test();
888 kgdbts_break_test();
889}
890
891static void kgdbts_run_tests(void)
892{
893 char *ptr;
894 int fork_test = 0;
Harvey Harrison001fddf2008-04-24 16:57:23 -0500895 int do_sys_open_test = 0;
Jason Wessel7cfcd9852008-04-24 16:57:23 -0500896 int sstep_test = 1000;
Jason Wessele8d31c22008-03-07 16:34:17 -0600897 int nmi_sleep = 0;
Jason Wessel7cfcd9852008-04-24 16:57:23 -0500898 int i;
Jason Wessele8d31c22008-03-07 16:34:17 -0600899
Geert Uytterhoeven59d309f2009-12-11 08:43:15 -0600900 ptr = strchr(config, 'F');
Jason Wessele8d31c22008-03-07 16:34:17 -0600901 if (ptr)
Harvey Harrison001fddf2008-04-24 16:57:23 -0500902 fork_test = simple_strtol(ptr + 1, NULL, 10);
Geert Uytterhoeven59d309f2009-12-11 08:43:15 -0600903 ptr = strchr(config, 'S');
Jason Wessele8d31c22008-03-07 16:34:17 -0600904 if (ptr)
Harvey Harrison001fddf2008-04-24 16:57:23 -0500905 do_sys_open_test = simple_strtol(ptr + 1, NULL, 10);
Geert Uytterhoeven59d309f2009-12-11 08:43:15 -0600906 ptr = strchr(config, 'N');
Jason Wessele8d31c22008-03-07 16:34:17 -0600907 if (ptr)
908 nmi_sleep = simple_strtol(ptr+1, NULL, 10);
Geert Uytterhoeven59d309f2009-12-11 08:43:15 -0600909 ptr = strchr(config, 'I');
Jason Wessel7cfcd9852008-04-24 16:57:23 -0500910 if (ptr)
911 sstep_test = simple_strtol(ptr+1, NULL, 10);
Jason Wessele8d31c22008-03-07 16:34:17 -0600912
913 /* required internal KGDB tests */
914 v1printk("kgdbts:RUN plant and detach test\n");
915 run_plant_and_detach_test(0);
916 v1printk("kgdbts:RUN sw breakpoint test\n");
917 run_breakpoint_test(0);
918 v1printk("kgdbts:RUN bad memory access test\n");
919 run_bad_read_test();
Jason Wessel7cfcd9852008-04-24 16:57:23 -0500920 v1printk("kgdbts:RUN singlestep test %i iterations\n", sstep_test);
921 for (i = 0; i < sstep_test; i++) {
922 run_singlestep_break_test();
923 if (i % 100 == 0)
924 v1printk("kgdbts:RUN singlestep [%i/%i]\n",
925 i, sstep_test);
926 }
Jason Wessele8d31c22008-03-07 16:34:17 -0600927
928 /* ===Optional tests=== */
929
930 /* All HW break point tests */
931 if (arch_kgdb_ops.flags & KGDB_HW_BREAKPOINT) {
Jason Wesselb33cb812008-05-28 12:49:57 -0500932 hwbreaks_ok = 1;
Jason Wessele8d31c22008-03-07 16:34:17 -0600933 v1printk("kgdbts:RUN hw breakpoint test\n");
934 run_breakpoint_test(1);
935 v1printk("kgdbts:RUN hw write breakpoint test\n");
936 run_hw_break_test(1);
937 v1printk("kgdbts:RUN access write breakpoint test\n");
938 run_hw_break_test(0);
939 }
940
941 if (nmi_sleep) {
942 v1printk("kgdbts:RUN NMI sleep %i seconds test\n", nmi_sleep);
943 run_nmi_sleep_test(nmi_sleep);
944 }
945
Jason Wesselb33cb812008-05-28 12:49:57 -0500946#ifdef CONFIG_DEBUG_RODATA
947 /* Until there is an api to write to read-only text segments, use
948 * HW breakpoints for the remainder of any tests, else print a
949 * failure message if hw breakpoints do not work.
950 */
951 if (!(arch_kgdb_ops.flags & KGDB_HW_BREAKPOINT && hwbreaks_ok)) {
952 eprintk("kgdbts: HW breakpoints do not work,"
953 "skipping remaining tests\n");
954 return;
955 }
956 force_hwbrks = 1;
957#endif /* CONFIG_DEBUG_RODATA */
958
Jason Wessele8d31c22008-03-07 16:34:17 -0600959 /* If the do_fork test is run it will be the last test that is
960 * executed because a kernel thread will be spawned at the very
961 * end to unregister the debug hooks.
962 */
963 if (fork_test) {
964 repeat_test = fork_test;
965 printk(KERN_INFO "kgdbts:RUN do_fork for %i breakpoints\n",
966 repeat_test);
Harvey Harrison001fddf2008-04-24 16:57:23 -0500967 kthread_run(kgdbts_unreg_thread, NULL, "kgdbts_unreg");
Jason Wessele8d31c22008-03-07 16:34:17 -0600968 run_do_fork_test();
969 return;
970 }
971
972 /* If the sys_open test is run it will be the last test that is
973 * executed because a kernel thread will be spawned at the very
974 * end to unregister the debug hooks.
975 */
Harvey Harrison001fddf2008-04-24 16:57:23 -0500976 if (do_sys_open_test) {
977 repeat_test = do_sys_open_test;
Jason Wessele8d31c22008-03-07 16:34:17 -0600978 printk(KERN_INFO "kgdbts:RUN sys_open for %i breakpoints\n",
979 repeat_test);
Harvey Harrison001fddf2008-04-24 16:57:23 -0500980 kthread_run(kgdbts_unreg_thread, NULL, "kgdbts_unreg");
Jason Wessele8d31c22008-03-07 16:34:17 -0600981 run_sys_open_test();
982 return;
983 }
984 /* Shutdown and unregister */
985 kgdb_unregister_io_module(&kgdbts_io_ops);
986 configured = 0;
987}
988
989static int kgdbts_option_setup(char *opt)
990{
991 if (strlen(opt) > MAX_CONFIG_LEN) {
992 printk(KERN_ERR "kgdbts: config string too long\n");
993 return -ENOSPC;
994 }
995 strcpy(config, opt);
996
997 verbose = 0;
998 if (strstr(config, "V1"))
999 verbose = 1;
1000 if (strstr(config, "V2"))
1001 verbose = 2;
1002
1003 return 0;
1004}
1005
1006__setup("kgdbts=", kgdbts_option_setup);
1007
1008static int configure_kgdbts(void)
1009{
1010 int err = 0;
1011
1012 if (!strlen(config) || isspace(config[0]))
1013 goto noconfig;
1014 err = kgdbts_option_setup(config);
1015 if (err)
1016 goto noconfig;
1017
1018 final_ack = 0;
1019 run_plant_and_detach_test(1);
1020
1021 err = kgdb_register_io_module(&kgdbts_io_ops);
1022 if (err) {
1023 configured = 0;
1024 return err;
1025 }
1026 configured = 1;
1027 kgdbts_run_tests();
1028
1029 return err;
1030
1031noconfig:
1032 config[0] = 0;
1033 configured = 0;
1034
1035 return err;
1036}
1037
1038static int __init init_kgdbts(void)
1039{
1040 /* Already configured? */
1041 if (configured == 1)
1042 return 0;
1043
1044 return configure_kgdbts();
1045}
1046
1047static void cleanup_kgdbts(void)
1048{
1049 if (configured == 1)
1050 kgdb_unregister_io_module(&kgdbts_io_ops);
1051}
1052
1053static int kgdbts_get_char(void)
1054{
1055 int val = 0;
1056
1057 if (ts.run_test)
1058 val = ts.run_test(1, 0);
1059
1060 return val;
1061}
1062
1063static void kgdbts_put_char(u8 chr)
1064{
1065 if (ts.run_test)
1066 ts.run_test(0, chr);
1067}
1068
1069static int param_set_kgdbts_var(const char *kmessage, struct kernel_param *kp)
1070{
1071 int len = strlen(kmessage);
1072
1073 if (len >= MAX_CONFIG_LEN) {
1074 printk(KERN_ERR "kgdbts: config string too long\n");
1075 return -ENOSPC;
1076 }
1077
1078 /* Only copy in the string if the init function has not run yet */
1079 if (configured < 0) {
1080 strcpy(config, kmessage);
1081 return 0;
1082 }
1083
1084 if (kgdb_connected) {
1085 printk(KERN_ERR
1086 "kgdbts: Cannot reconfigure while KGDB is connected.\n");
1087
1088 return -EBUSY;
1089 }
1090
1091 strcpy(config, kmessage);
1092 /* Chop out \n char as a result of echo */
1093 if (config[len - 1] == '\n')
1094 config[len - 1] = '\0';
1095
1096 if (configured == 1)
1097 cleanup_kgdbts();
1098
1099 /* Go and configure with the new params. */
1100 return configure_kgdbts();
1101}
1102
1103static void kgdbts_pre_exp_handler(void)
1104{
1105 /* Increment the module count when the debugger is active */
1106 if (!kgdb_connected)
1107 try_module_get(THIS_MODULE);
1108}
1109
1110static void kgdbts_post_exp_handler(void)
1111{
1112 /* decrement the module count when the debugger detaches */
1113 if (!kgdb_connected)
1114 module_put(THIS_MODULE);
1115}
1116
1117static struct kgdb_io kgdbts_io_ops = {
1118 .name = "kgdbts",
1119 .read_char = kgdbts_get_char,
1120 .write_char = kgdbts_put_char,
1121 .pre_exception = kgdbts_pre_exp_handler,
1122 .post_exception = kgdbts_post_exp_handler,
1123};
1124
1125module_init(init_kgdbts);
1126module_exit(cleanup_kgdbts);
1127module_param_call(kgdbts, param_set_kgdbts_var, param_get_string, &kps, 0644);
1128MODULE_PARM_DESC(kgdbts, "<A|V1|V2>[F#|S#][N#]");
1129MODULE_DESCRIPTION("KGDB Test Suite");
1130MODULE_LICENSE("GPL");
1131MODULE_AUTHOR("Wind River Systems, Inc.");
1132