Hello Derek, What compile option do you give for your driver? -O2? Prologue of a function is something mysterious on -O2. I always give -O0 for the driver I want to debug. -caz
-----Original Message----- From: Derek Atkins [mailto:[email protected]] Sent: Thursday, April 30, 2009 11:30 AM To: Caz Yokoyama Cc: [email protected] Subject: Problems with "next" and "fin" debugging 2.6.27 Caz, Using your gdb-6.8-kgdblight and 2.6.27 I'm having some single-stepping problems that I didn't have with my pervious gdb-6.8 with kgdb-2.6.23. I was able to set a breakpoint just fine. The breakpoint hit. Then I wanted to step through the program but when I try I have issues. It seems like 'next' is acting just like 'step'.. And 'fin' just doesn't work at all. The "Unknown error" looks suspiciously like "(signed long)-1" -- I'm working on a 32-bit Host with a 32-bit target. Below is the gdb info... -derek (gdb) c Continuing. [Switching to Thread 1028] Breakpoint 2, mydriver_do_requests (q=0xde0857e8) at my-driver.c:699 699 { (gdb) n 701 struct mydriver_config *cfg = q->queuedata; (gdb) 704 ENTER("%p", q); (gdb) 701 struct mydriver_config *cfg = q->queuedata; (gdb) 704 ENTER("%p", q); (gdb) printk (fmt=0x14cc2 <Address 0x14cc2 out of bounds>) at kernel/printk.c:599 599 { (gdb) n 604 r = vprintk(fmt, args); (gdb) vprintk (fmt=0x8957e589 <Address 0x8957e589 out of bounds>, args=0x80be56c7 <Address 0x80be56c7 out of bounds>) at kernel/printk.c:666 666 { (gdb) vprintk (fmt=0xe09bfc23 "<6>ENTER[%p]: %s() %p\n", args=0xde54ebd4 "") at kernel/printk.c:210 210 if (boot_delay == 0 || system_state != SYSTEM_BOOTING) (gdb) 668 int current_log_level = default_message_loglevel; (gdb) fin Run till exit from #0 vprintk (fmt=0xe09bfc23 "<6>ENTER[%p]: %s() %p\n", args=0xde54ebd4 "") at kernel/printk.c:668 Warning: Cannot insert breakpoint 0. Error accessing memory address 0xc06409b5: Unknown error 4294967295. -- Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory Member, MIT Student Information Processing Board (SIPB) URL: http://web.mit.edu/warlord/ PP-ASEL-IA N1NWH [email protected] PGP key available ------------------------------------------------------------------------------ Register Now & Save for Velocity, the Web Performance & Operations Conference from O'Reilly Media. Velocity features a full day of expert-led, hands-on workshops and two days of sessions from industry leaders in dedicated Performance & Operations tracks. Use code vel09scf and Save an extra 15% before 5/3. http://p.sf.net/sfu/velocityconf _______________________________________________ Kgdb-bugreport mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/kgdb-bugreport
