Commit 974460c5 authored by Jason Wessel's avatar Jason Wessel Committed by Ingo Molnar
Browse files

kgdb: allow static kgdbts boot configuration 



This patch adds in the ability to compile the kgdb internal test
string into the kernel so as to run the tests at boot without changing
the kernel boot arguments.  This patch also changes all the error
paths to invoke WARN_ON(1) which will emit the line number of the file
and dump the kernel stack when an error occurs.

You can disable the tests in a kernel that is built this way
using "kgdbts="

Signed-off-by: default avatarJason Wessel <jason.wessel@windriver.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent e3e2aaf7

drivers/misc/kgdbts.c

+24 −17
Original line number Diff line number Diff line
@@ -112,6 +112,10 @@ 
		printk(KERN_INFO a); \

		touch_nmi_watchdog();	\

	} while (0)

#define eprintk(a...) do { \

		printk(KERN_ERR a); \

		WARN_ON(1); \

	} while (0)

#define MAX_CONFIG_LEN		40



static const char hexchars[] = "0123456789abcdef";
@@ -145,7 +149,11 @@ static struct pt_regs kgdbts_regs; 
/* -1 = init not run yet, 0 = unconfigured, 1 = configured. */

static int configured		= -1;



#ifdef CONFIG_KGDB_TESTS_BOOT_STRING

static char config[MAX_CONFIG_LEN] = CONFIG_KGDB_TESTS_BOOT_STRING;

#else

static char config[MAX_CONFIG_LEN];

#endif

static struct kparam_string kps = {

	.string			= config,

	.maxlen			= MAX_CONFIG_LEN,
@@ -289,7 +297,7 @@ static int check_and_rewind_pc(char *put_str, char *arg) 
#endif

	if (strcmp(arg, "silent") &&

		instruction_pointer(&kgdbts_regs) + offset != addr) {

		printk(KERN_ERR "kgdbts: BP mismatch %lx expected %lx\n",

		eprintk("kgdbts: BP mismatch %lx expected %lx\n",

			   instruction_pointer(&kgdbts_regs) + offset, addr);

		return 1;

	}
@@ -313,7 +321,7 @@ static int check_single_step(char *put_str, char *arg) 
	v2printk("Singlestep stopped at IP: %lx\n",

		   instruction_pointer(&kgdbts_regs));

	if (instruction_pointer(&kgdbts_regs) == addr) {

		printk(KERN_ERR "kgdbts: SingleStep failed at %lx\n",

		eprintk("kgdbts: SingleStep failed at %lx\n",

			   instruction_pointer(&kgdbts_regs));

		return 1;

	}
@@ -378,7 +386,7 @@ static void emul_sstep_get(char *arg) 
		break_helper("z0", 0, sstep_addr);

		break;

	default:

		printk(KERN_ERR "kgdbts: ERROR failed sstep get emulation\n");

		eprintk("kgdbts: ERROR failed sstep get emulation\n");

	}

	sstep_state++;

}
@@ -404,26 +412,26 @@ static int emul_sstep_put(char *put_str, char *arg) 
		break;

	case 2:

		if (strncmp(put_str, "$OK", 3)) {

			printk(KERN_ERR "kgdbts: failed sstep break set\n");

			eprintk("kgdbts: failed sstep break set\n");

			return 1;

		}

		break;

	case 3:

		if (strncmp(put_str, "$T0", 3)) {

			printk(KERN_ERR "kgdbts: failed continue sstep\n");

			eprintk("kgdbts: failed continue sstep\n");

			return 1;

		}

		break;

	case 4:

		if (strncmp(put_str, "$OK", 3)) {

			printk(KERN_ERR "kgdbts: failed sstep break unset\n");

			eprintk("kgdbts: failed sstep break unset\n");

			return 1;

		}

		/* Single step is complete so continue on! */

		sstep_state = 0;

		return 0;

	default:

		printk(KERN_ERR "kgdbts: ERROR failed sstep put emulation\n");

		eprintk("kgdbts: ERROR failed sstep put emulation\n");

	}



	/* Continue on the same test line until emulation is complete */
@@ -668,8 +676,7 @@ static int run_simple_test(int is_get_char, int chr) 
		}



		if (get_buf[get_buf_cnt] == '\0') {

			printk(KERN_ERR

			   "kgdbts: ERROR GET: end of buffer on '%s' at %i\n",

			eprintk("kgdbts: ERROR GET: EOB on '%s' at %i\n",

			   ts.name, ts.idx);

			get_buf_cnt = 0;

			fill_get_buf("D");
@@ -684,13 +691,13 @@ static int run_simple_test(int is_get_char, int chr) 
	 */

	if (ts.tst[ts.idx].get[0] == '\0' &&

		ts.tst[ts.idx].put[0] == '\0') {

		printk(KERN_ERR "kgdbts: ERROR: beyond end of test on"

		eprintk("kgdbts: ERROR: beyond end of test on"

			   " '%s' line %i\n", ts.name, ts.idx);

		return 0;

	}



	if (put_buf_cnt >= BUFMAX) {

		printk(KERN_ERR "kgdbts: ERROR: put buffer overflow on"

		eprintk("kgdbts: ERROR: put buffer overflow on"

			   " '%s' line %i\n", ts.name, ts.idx);

		put_buf_cnt = 0;

		return 0;
@@ -708,7 +715,7 @@ static int run_simple_test(int is_get_char, int chr) 
		v2printk("put%i: %s\n", ts.idx, put_buf);

		/* Trigger check here */

		if (ts.validate_put && ts.validate_put(put_buf)) {

			printk(KERN_ERR "kgdbts: ERROR PUT: end of test "

			eprintk("kgdbts: ERROR PUT: end of test "

			   "buffer on '%s' line %i expected %s got %s\n",

			   ts.name, ts.idx, ts.tst[ts.idx].put, put_buf);

		}
@@ -772,7 +779,7 @@ static void run_breakpoint_test(int is_hw_breakpoint) 
	if (test_complete)

		return;



	printk(KERN_ERR "kgdbts: ERROR %s test failed\n", ts.name);

	eprintk("kgdbts: ERROR %s test failed\n", ts.name);

}



static void run_hw_break_test(int is_write_test)
@@ -791,7 +798,7 @@ static void run_hw_break_test(int is_write_test) 
	hw_break_val_access();

	if (is_write_test) {

		if (test_complete == 2)

			printk(KERN_ERR "kgdbts: ERROR %s broke on access\n",

			eprintk("kgdbts: ERROR %s broke on access\n",

				ts.name);

		hw_break_val_write();

	}
@@ -800,7 +807,7 @@ static void run_hw_break_test(int is_write_test) 
	if (test_complete == 1)

		return;



	printk(KERN_ERR "kgdbts: ERROR %s test failed\n", ts.name);

	eprintk("kgdbts: ERROR %s test failed\n", ts.name);

}



static void run_nmi_sleep_test(int nmi_sleep)
@@ -817,12 +824,12 @@ static void run_nmi_sleep_test(int nmi_sleep) 
	touch_nmi_watchdog();

	local_irq_restore(flags);

	if (test_complete != 2)

		printk(KERN_ERR "kgdbts: ERROR nmi_test did not hit nmi\n");

		eprintk("kgdbts: ERROR nmi_test did not hit nmi\n");

	kgdb_breakpoint();

	if (test_complete == 1)

		return;



	printk(KERN_ERR "kgdbts: ERROR %s test failed\n", ts.name);

	eprintk("kgdbts: ERROR %s test failed\n", ts.name);

}



static void run_bad_read_test(void)

lib/Kconfig.kgdb

+18 −0
Original line number Diff line number Diff line
@@ -38,3 +38,21 @@ config KGDB_TESTS 
	  See the drivers/misc/kgdbts.c for the details about

	  the tests.  The most basic of this I/O module is to boot

	  a kernel boot arguments "kgdbwait kgdbts=V1F100"



config KGDB_TESTS_ON_BOOT

	bool "KGDB: Run tests on boot"

	depends on KGDB_TESTS

	default n

	help

	  Run the kgdb tests on boot up automatically without the need

	  to pass in a kernel parameter



config KGDB_TESTS_BOOT_STRING

	string "KGDB: which internal kgdb tests to run"

	depends on KGDB_TESTS_ON_BOOT

	default "V1F100"

	help

	  This is the command string to send the kgdb test suite on

	  boot.  See the drivers/misc/kgdbts.c for detailed

	  information about other strings you could use beyond the

	  default of V1F100.

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