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path: root/drivers/misc/kgdbts.c
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2008-05-28kgdbts: Use HW breakpoints with CONFIG_DEBUG_RODATAJason Wessel
Whenever CONFIG_DEBUG_RODATA is set in the kernel config many kernel text sections become read-only, and the use of software breakpoints in the kgdb tests will cause the kernel to fail to complete the start up. Until such time that there is an official API for modifying read-only text sections hardware breakpoints must be used to run the do_fork or sys_open tests or the tests get skipped. Also fix the duplicated include reported by: Huang Weiyi <weiyi.huang@gmail.com> Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
2008-05-28kgdb: use common ascii helpers and put_unaligned_be32 helperHarvey Harrison
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
2008-05-05kgdb: 1000 loops for the single step test in kgdbtsJason Wessel
The single step test is not terribly costly and it should be able to pass at 1000 loops successfully in under 1 second. A non-kgdb timing regression was found using this test, but it did not occur frequently because by default the test was only executed a single time. This patch changes the default for the single step test to 1000 iterations and allows for individual configuration of the single step test to further exercise the kgdb subsystem when needed. Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
2008-05-05kgdb: trivial sparse fixes in kgdb test-suiteHarvey Harrison
Shadowed variable and integer as NULL pointer fixes: drivers/misc/kgdbts.c:877:6: warning: symbol 'sys_open_test' shadows an earlier one drivers/misc/kgdbts.c:537:27: originally declared here drivers/misc/kgdbts.c:378:22: warning: Using plain integer as NULL pointer drivers/misc/kgdbts.c:386:22: warning: Using plain integer as NULL pointer drivers/misc/kgdbts.c:468:30: warning: Using plain integer as NULL pointer drivers/misc/kgdbts.c:472:15: warning: Using plain integer as NULL pointer drivers/misc/kgdbts.c:502:30: warning: Using plain integer as NULL pointer drivers/misc/kgdbts.c:506:30: warning: Using plain integer as NULL pointer drivers/misc/kgdbts.c:509:30: warning: Using plain integer as NULL pointer drivers/misc/kgdbts.c:523:20: warning: Using plain integer as NULL pointer drivers/misc/kgdbts.c:527:20: warning: Using plain integer as NULL pointer drivers/misc/kgdbts.c:530:15: warning: Using plain integer as NULL pointer drivers/misc/kgdbts.c:541:21: warning: Using plain integer as NULL pointer drivers/misc/kgdbts.c:545:21: warning: Using plain integer as NULL pointer drivers/misc/kgdbts.c:548:15: warning: Using plain integer as NULL pointer drivers/misc/kgdbts.c:559:30: warning: Using plain integer as NULL pointer drivers/misc/kgdbts.c:563:15: warning: Using plain integer as NULL pointer drivers/misc/kgdbts.c:573:16: warning: Using plain integer as NULL pointer drivers/misc/kgdbts.c:574:19: warning: Using plain integer as NULL pointer drivers/misc/kgdbts.c:578:15: warning: Using plain integer as NULL pointer drivers/misc/kgdbts.c:588:16: warning: Using plain integer as NULL pointer drivers/misc/kgdbts.c:589:19: warning: Using plain integer as NULL pointer drivers/misc/kgdbts.c:593:15: warning: Using plain integer as NULL pointer drivers/misc/kgdbts.c:602:16: warning: Using plain integer as NULL pointer drivers/misc/kgdbts.c:604:15: warning: Using plain integer as NULL pointer drivers/misc/kgdbts.c:925:3: warning: Using plain integer as NULL pointer drivers/misc/kgdbts.c:938:3: warning: Using plain integer as NULL pointer Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
2008-04-29kgdbts: Sparc needs sstep emulation.David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-04-17kgdb: allow static kgdbts boot configurationJason Wessel
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: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-04-17kgdb: add kgdb internal test suiteJason Wessel
This patch adds regression tests for testing the kgdb core and arch specific implementation. The kgdb test suite is designed to be built into the kernel and not as a module because it uses a number of low level kernel and kgdb primitives which should not be exported externally. The kgdb test suite is designed as a KGDB I/O module which simulates the communications that a debugger would have with kgdb. The tests are broken up in to a line by line and referenced here as a "get" which is kgdb requesting input and "put" which is kgdb sending a response. The kgdb suite can be invoked from the kernel command line arguments system or executed dynamically at run time. The test suite uses the variable "kgdbts" to obtain the information about which tests to run and to configure the verbosity level. The following are the various characters you can use with the kgdbts= line: When using the "kgdbts=" you only choose one of the following core test types: A = Run all the core tests silently V1 = Run all the core tests with minimal output V2 = Run all the core tests in debug mode You can also specify optional tests: N## = Go to sleep with interrupts of for ## seconds to test the HW NMI watchdog F## = Break at do_fork for ## iterations S## = Break at sys_open for ## iterations NOTE: that the do_fork and sys_open tests are mutually exclusive. To invoke the kgdb test suite from boot you use a kernel start argument as follows: kgdbts=V1 kgdbwait Or if you wanted to perform the NMI test for 6 seconds and do_fork test for 100 forks, you could use: kgdbts=V1N6F100 kgdbwait The test suite can also be invoked at run time with: echo kgdbts=V1N6F100 > /sys/module/kgdbts/parameters/kgdbts Or as another example: echo kgdbts=V2 > /sys/module/kgdbts/parameters/kgdbts When developing a new kgdb arch specific implementation or using these tests for the purpose of regression testing, several invocations are required. 1) Boot with the test suite enabled by using the kernel arguments "kgdbts=V1F100 kgdbwait" ## If kgdb arch specific implementation has NMI use "kgdbts=V1N6F100 2) After the system boot run the basic test. echo kgdbts=V1 > /sys/module/kgdbts/parameters/kgdbts 3) Run the concurrency tests. It is best to use n+1 while loops where n is the number of cpus you have in your system. The example below uses only two loops. ## This tests break points on sys_open while [ 1 ] ; do find / > /dev/null 2>&1 ; done & while [ 1 ] ; do find / > /dev/null 2>&1 ; done & echo kgdbts=V1S10000 > /sys/module/kgdbts/parameters/kgdbts fg # and hit control-c fg # and hit control-c ## This tests break points on do_fork while [ 1 ] ; do date > /dev/null ; done & while [ 1 ] ; do date > /dev/null ; done & echo kgdbts=V1F1000 > /sys/module/kgdbts/parameters/kgdbts fg # and hit control-c Signed-off-by: Jason Wessel <jason.wessel@windriver.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>