Demo_gdb_session

Example of gdb session

Board: Microstick II with adapted PICkit3 scripting firmware (download here).

ejtagproxy log

$ ejtagproxy
GDB proxy for Microchip PIC32 processors, Version 1.0.11
Copyright (C) 2012 Serge Vakulenko

EJTAGproxy comes with ABSOLUTELY NO WARRANTY; for details
use `--warranty' option. This is Open Source software. You are
welcome to redistribute it under certain conditions. Use the
'--copying' option for details.

ejtagproxy: waiting on TCP port 2000
ejtagproxy: connected
adapter: PICkit3 Version 2.0.0
processor: MX150F128B
processor: reset occured
hardware: 6 breakpoints, 2 watchpoints
oscillator: internal Fast RC, PLL div 1:2:2 mult x20

gdb log

$ mipsel-elf32-gdb flash.elf
GNU gdb 6.8
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "--host=i386-apple-darwin10.4.0 --target=mipsel-elf32"...
(gdb) set remote hardware-breakpoint-limit 6
(gdb) set remote hardware-watchpoint-limit 2
(gdb) set endian little
The target is assumed to be little endian
(gdb) target remote localhost:2000
0xbfc00000 in ?? ()
(gdb) b main
Breakpoint 1 at 0x9fc00068: file flash.c, line 65.
(gdb) c
Continuing.

Breakpoint 1, main () at flash.c:65
65          mtc0 (C0_COUNT, 0, 0);
(gdb) n
66          mtc0 (C0_COMPARE, 0, -1);
(gdb) n
67          mtc0 (C0_EBASE, 1, 0x9fc00000);     /* Vector base */
(gdb) c
Continuing.
^C
Program received signal SIGTRAP, Trace/breakpoint trap.
udelay (usec=<value optimized out>) at flash.c:57
57              if ((int) (now - final) >= 0)
(gdb) bt
#0  udelay (usec=<value optimized out>) at flash.c:57
#1  0x9fc00118 in main () at flash.c:96
(gdb) i reg
          zero       at       v0       v1       a0       a1       a2       a3
 R0   00000000 00000000 0f4033d1 0fac0ff9 00f42400 00000000 00000000 00000000
            t0       t1       t2       t3       t4       t5       t6       t7
 R8   00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
            s0       s1       s2       s3       s4       s5       s6       s7
 R16  bf88603c 00000001 bf88613c 00000100 0007a120 00000000 00000000 00000000
            t8       t9       k0       k1       gp       sp       s8       ra
 R24  00000000 00000000 00000000 00000000 a0000000 a0000fd8 00000000 9fc00118
            sr       lo       hi      bad    cause       pc
      00000000 b8d52c8f 72e9e56d bf5c729b b0800038 9fc00038
           fsr      fir
      00000000 00000000
(gdb) b udelay
Breakpoint 2 at 0x9fc00020: file flash.c, line 51.
(gdb) c
Continuing.

Breakpoint 2, udelay (usec=500000) at flash.c:51
51          unsigned final = now + usec * MHZ / 2;
(gdb) n
54              now = mfc0 (C0_COUNT, 0);
(gdb) n
57              if ((int) (now - final) >= 0)
(gdb) n
60      }
(gdb) monitor reg
               t0=        0   s0= bf88603c   t8=        0        lo= b8d52c8f
at=        0   t1=        0   s1=        1   t9=        0        hi= 72e9e56d
v0= 1113bade   t2=        0   s2= bf88613c   k0=        0    status=        0
v1= 32fd594f   t3=        0   s3=      100   k1=        0     cause= b0800038
a0=   f42400   t4=        0   s4=    7a120   gp= a0000000  badvaddr= bf5c729b
a1=        0   t5=        0   s5=        0   sp= a0000fd8        pc= 9fc00044
a2=        0   t6=        0   s6=        0   s8=        0
a3=        0   t7=        0   s7=        0   ra= 9fc00118
(gdb) _