linux-kernel - Re: kgdb errors with serial console

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-id: <C90C915C-B8A6-47F3-9935-63C9A060BDB1@mac.com>
Date:	Sat, 09 Oct 2010 02:33:30 +0400
From:	Elvis Dowson <elvis.dowson@....com>
To:	Jason Wessel <jason.wessel@...driver.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>
Subject: Re: kgdb errors with serial console

Hi Jason,
                    Some good news. I switch the GDB command set from mi to mi1, and it seems to be working now. 

What I did is added the kgdbwait command to the bootargs as follows (not sure if it was necessary, but will try once again without it)

setenv mmcargs 'setenv bootargs console=${console} vram=12M omapfb.vram=0:4M omapfb.mode=dvi:${dvimode} omapdss.def_disp=${defaultdisplay} root=/dev/mmcblk0p2 rw rootfstype=ext3 rootwait kgdb=${console} kgdboc=${console} kgdbwait'

Then I launched the debugger, and it did something, and resumed normally. 

Then I manually went to the console and activated kgdb by typing 

echo g > /proc/sysrq-trigger

This caused the debugger on the Eclipse side to process something, and then it stopped in file kgdb.c at the call to arch_kgdb_breakpoint(), in the following method:

void kgdb_breakpoint(void)
{
	atomic_set(&kgdb_setting_breakpoint, 1);
	wmb(); /* Sync point before breakpoint */
	arch_kgdb_breakpoint();
	wmb(); /* Sync point after breakpoint */
	atomic_set(&kgdb_setting_breakpoint, 0);
}

I can now clearly see all the registers and variables in Eclipse. 

Question 02: sys_sync doesn't seem to be called in the ARM arch files, it only exists for x86 and sparc architectures.

Is there any other kernel file I can set a break-point into, to be able to check if everything is working ok?

For example, if I type a normal cd or ls command? 

Best regards,

Elvis

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/