Hi Daniel,
you're right about the quota of the signal session. It gets upgraded dynamically and the "Quota exceeded!" warning can be ignored in this case.
I'm not sure about the cause of the breakpoint problem. Which version of GDB are you using? If it's not the current version 7.3.1, my first suggestion would be to try this version, which is also the version the GDB monitor implementation is based on. You can find the GDB 7.3.1 source archive in the 'ports/download' directory and build a GDB specifically for Genode by using the following 'configure' line:
configure --prefix=/usr/local/genode-gcc --program-prefix=genode-x86-
When starting GDB from a run script, the '[gdb]' function looks for CROSS_DEV_PREFIX-gdb first, so it already prefers the Genode-GDB to the host GDB.
There's currently no programmatic API to trigger a breakpoint, but it should work with asm("int $4").
Regards, Christian
On 10/20/2011 05:39 PM, Daniel Waddington wrote:
Hi Norman, This worked, but I am still not out of the woods. First, there seems to be a signal quota issue (although I think this may be OK as more quota is requested dynamically?). Second I have trouble setting break points. When I set a break point and continue in gdb, it reports warning: Error removing breakpoint X.
Also, is there a programmatic API to trigger a break into GDB (asm("int3") enters JDB)?
Regards, Daniel
[init -> gdb_monitor] Remote debugging using /dev/terminal [init -> gdb_monitor] Memory model: no memory at address 1009164 [init -> gdb_monitor] Memory model: no memory at address 1009165 [init -> gdb_monitor] Memory model: no memory at address 1009166 ... REPEAT MANY TIMES [init -> gdb_monitor] Memory model: no memory at address 1000160 [init -> gdb_monitor] Memory model: no memory at address 1000161 [init -> gdb_monitor] Memory model: no memory at address 1000162 [init -> gdb_monitor] Memory model: no memory at address 1000163 [init -> gdb_monitor] Memory model: no memory at address 1000164 [init -> gdb_monitor] Memory model: no memory at address 1000161 [init -> gdb_monitor] (attempted to write 0) [init -> gdb_monitor] linux_resume_one_lwp(step = 0, signal = 0) [init -> gdb_monitor] genode_store_registers() - not yet implemented [init -> gdb_monitor] genode_wait_for_signal_or_gdb_interrupt [init -> gdb_monitor -> thread-migration] Starting ldso ... [init -> gdb_monitor] received signal for lwpid 1 [init -> gdb_monitor] linux_resume_one_lwp(step = 1, signal = 0) [init -> gdb_monitor] genode_store_registers() - not yet implemented [init -> gdb_monitor] genode_wait_for_signal_or_gdb_interrupt [init -> gdb_monitor] received signal for lwpid 1 [init -> gdb_monitor] linux_resume_one_lwp(step = 0, signal = 0) [init -> gdb_monitor] genode_store_registers() - not yet implemented [init -> gdb_monitor] genode_wait_for_signal_or_gdb_interrupt [init -> gdb_monitor -> thread-migration] Starting application ... environ: 85004 [init -> gdb_monitor -> thread-migration] ==THREAD MIGRATION EXAMPLE=============== [init -> gdb_monitor -> thread-migration] Creating thread [0] [init -> gdb_monitor] add_lwp(1, 2, 0) [init -> gdb_monitor -> thread-migration] Creating thread [1] [init -> gdb_monitor] add_lwp(1, 3, 0) [init -> gdb_monitor -> thread-migration] Creating thread [2] [init -> gdb_monitor] received signal for lwpid 2 Quota exceeded! amount=4096, size=4096, consumed=4096 ??
---- GDB SIDE --- (gdb) target remote localhost:5555 Remote debugging using localhost:5555 Reading symbols from ld.lib.so...done. Loaded symbols for ld.lib.so 0x00055c50 in _start_ldso () from ld.lib.so (gdb) (gdb) break OmniOS::sleep Breakpoint 1 at 0x1000160: file /home/dwaddington/git/omnios/genode/base/../omnios/include/omnios/sleep.h, line 45. (gdb) c Continuing. warning: Error removing breakpoint 1
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