CS644 Using remote gdb with Xinu
---------------first window: download and run mon-worker.lnx using Tutor------------
blade57(1)% ls
Makefile mon-worker.c mon-worker.lnx mon-worker.opc typescript
blade57(2)% make clean
rm -f *.opc *.lnx syms core *.o
blade57(3)% ls
Makefile mon-worker.c typescript
blade57(4)% make U=mon-worker
/groups/ulab/bin/i386-gcc -c -g -I/sources/xinu-pentium/include -Wall -Wstrict-prototypes -Wmissin
g-prototypes -Wno-uninitialized -Wshadow -ansi -o mon-worker.opc mon-worker.c
/groups/ulab/bin/i386-ld -N -Ttext 1000e0 -o mon-worker.lnx \
/sources/xinu-pentium/lib/startup0.opc /sources/xinu-pentium/lib/xinu_startup.opc /sources
/xinu-pentium/lib/support.opc /sources/xinu-pentium/lib/initialize.opc /sources/xinu-pentium/lib/i
ntr.opc /sources/xinu-pentium/lib/clkint.opc /sources/xinu-pentium/lib/ctxsw.opc /sources/xinu-pen
tium/lib/cpureg.opc /sources/xinu-pentium/lib/comint.opc /sources/xinu-pentium/lib/kbmint.opc /sou
rces/xinu-pentium/lib/nullnet.opc /sources/xinu-pentium/lib/lpstubs.opc mon-worker.opc \
/sources/xinu-pentium/lib/libxc.a /sources/xinu-pentium/lib/libx.a /sources/xinu-pentium/l
ib/libxc.a
/groups/ulab/bin/i386-nm -n mon-worker.lnx > syms
blade57(5)% mtip -b 14 -f mon-worker.lnx (1) Use systems 11 - 14 for fast download
For command help, type ~?
For help on args, rerun without args
Code starts at 0x100100
Using board # 14
Tutor> ~downloading mon-worker.lnx (2)~d for download
............................Done.
Download done, setting EIP to 100100.
Tutor> gdb (3)-----------> now use other window
Setting gdb dev to COM1, starting gdb (CTRL-C to abort).
maxaddr=3fffff (8)
PC Xinu
4194304 bytes real mem
clock enabled
Enter cycles of work for worker to do: 10000 (12)
Type <CR> for progress report, control-space or ~r to abort
Worker starting
(32)
worker at # 1348
(37)
worker at # 2080
Null char received on console, trapping to Tutor. (38) typed control-space
Tutor>
Tutor>
Quit handler: (40) typed control-C
killing process 25546 Leaving board #14
blade57(6)% exit
script done on Mon Feb 22 19:56:33 2010
--------------------------Second window: remote gdb-----------------------------
Script started on Mon Feb 22 19:50:24 2010 warning: could not update
utmp entry blade57(1)% blade57(1)% i386-gdb mon-worker.lnx (4)
GDB is free software and you are welcome to
distribute copies of it
under certain conditions; type "show copying" to see the conditions.
There is absolutely no warranty for GDB; type "show warranty" for details.
GDB 4.15.1 (sparc-sun-sunos4.1.3 --target i386-linuxaout),
Copyright 1995 Free Software Foundation, Inc...
(gdb) tar rem /dev/remgdb14 (5)
Remote debugging using /dev/remgdb14
0x100100 in /sources/xinu-pentium/lib/startup0.opc ()
(gdb) b main (6)
Breakpoint 1 at 0x10093b: file mon-worker.c, line 18.
(gdb) c (7)----------> look in other window for bootup
Continuing.
Breakpoint 1, main () at mon-worker.c:18 (9)
18 printf("Enter cycles of work for worker to do: ");
(gdb) n (10)
19 fgets(buf,BUFLEN,CONSOLE);
(gdb) n (11)------> enter # in other window
20 sscanf(buf,"%d",&nwork);
(gdb) b create (13)
Breakpoint 2 at 0x1021a7: file ../sys/create.c, line 31.
(gdb) c (14)
Continuing.
Breakpoint 2, create (procaddr=0x1009e0, ssize=1000, priority=20, name=0x100918 "worker",
nargs=1, args=10000) at ../sys/create.c:31
31 disable(ps);
(gdb) where (15)
#0 create (procaddr=0x1009e0, ssize=1000, priority=20, name=0x100918 "worker", nargs=1,
args=10000) at ../sys/create.c:31
#1 0x100996 in main () at mon-worker.c:22
#2 0x102198 in startmain () at ../sys/main.c:18
(gdb) l main (16)
9
10 void work(int ncycles);
11 void docycle(int n);
12
13 void main(void)
14 {
15 int nwork;
16 char buf[BUFLEN];
17
18 printf("Enter cycles of work for worker to do: ");
(gdb) l (17)
19 fgets(buf,BUFLEN,CONSOLE);
20 sscanf(buf,"%d",&nwork);
21 printf("Type <CR> for progress report, control-space or ~r to abort\n");
22 resume(create(work,1000,20,"worker",1,nwork));
23 while (1)
24 {
25 getc(CONSOLE); /* wait for <CR> from keyboard */
26 printf("worker at # %d\n",workcount); /* report on worker */
27 }
28 }
(gdb) l (18)
29
30 /* worker top-level function: do ncycles of "work" */
31 void work(int ncycles)
32 {
33 int i;
34 printf("Worker starting\n");
35 for (i=1;i<=ncycles;i++)
36 {
37 docycle(i); /* do ith work cycle */
38 workcount++; /* count it where parent can see it */
(gdb) b getc (19)
Breakpoint 3 at 0x102e3f: file ../sys/getc.c, line 16.
(gdb) c (20)
Continuing.
Breakpoint 3, getc (descrp=0) at ../sys/getc.c:16
16 if (isbaddev(descrp) )
(gdb) where (21)
#0 getc (descrp=0) at ../sys/getc.c:16
#1 0x1009b3 in main () at mon-worker.c:25
#2 0x102198 in startmain () at ../sys/main.c:18
(gdb) p proctab[0] (22)
$1 = {pstate = 3 '\003', pprio = 0, pesp = 4193940, psem = 0, pmsg = 0, phasmsg = 0 '\000',
pbase = 4194300, pstklen = 0, plimit = 4184064,
pname = "prnull\000\000\000\000\000\000\000\000\000", pargs = 0, paddr = 1048944}
(gdb) p/x proctab[0] (23)
$2 = {pstate = 0x3, pprio = 0x0, pesp = 0x3ffe94, psem = 0x0, pmsg = 0x0, phasmsg = 0x0,
pbase = 0x3ffffc, pstklen = 0x0, plimit = 0x3fd800, pname = {0x70, 0x72, 0x6e, 0x75, 0x6c,
0x6c, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, pargs = 0x0, paddr = 0x100170}
(gdb) p proctab[49] (24)
$3 = {pstate = 1 '\001', pprio = 20, pesp = 4183836, psem = 98, pmsg = 0, phasmsg = 0 '\000',
pbase = 4184056, pstklen = 20480, plimit = 4163580, pname = "main", '\000' <repeats 11 times>,
pargs = 1, paddr = 1057152}
(gdb) p/x proctab[49] (25)
$4 = {pstate = 0x1, pprio = 0x14, pesp = 0x3fd71c, psem = 0x62, pmsg = 0x0, phasmsg = 0x0,
pbase = 0x3fd7f8, pstklen = 0x5000, plimit = 0x3f87fc, pname = {0x6d, 0x61, 0x69, 0x6e,
0x0 <repeats 12 times>}, pargs = 0x1, paddr = 0x102180}
(gdb) p proctab[48] (26)
$5 = {pstate = 3 '\003', pprio = 20, pesp = 4163292, psem = 0, pmsg = 0, phasmsg = 0 '\000',
pbase = 4163576, pstklen = 10240, plimit = 4153340,
pname = "worker\000\000\000\000\000\000\000\000\000", pargs = 1, paddr = 1051104}
(gdb) p/x proctab[48] (27)
$6 = {pstate = 0x3, pprio = 0x14, pesp = 0x3f86dc, psem = 0x0, pmsg = 0x0, phasmsg = 0x0,
pbase = 0x3f87f8, pstklen = 0x2800, plimit = 0x3f5ffc, pname = {0x77, 0x6f, 0x72, 0x6b, 0x65,
0x72, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, pargs = 0x1, paddr = 0x1009e0}
(gdb) p currpid (28) kernel var
$7 = 49
(gdb) p workcount (29) user var
$8 = 237
(gdb) i loc (30) local vars
devptr = (struct devsw *) 0x3f0216
(gdb) c (31) ---> enter CR in other window
Continuing.
Breakpoint 3, getc (descrp=0) at ../sys/getc.c:16 (33)
16 if (isbaddev(descrp) )
(gdb) i b (34)
Num Type Disp Enb Address What
1 breakpoint keep y 0x0010093b in main at mon-worker.c:18
breakpoint already hit 1 time
2 breakpoint keep y 0x001021a7 in create at ../sys/create.c:31
breakpoint already hit 1 time
3 breakpoint keep y 0x00102e3f in getc at ../sys/getc.c:16
breakpoint already hit 2 times
(gdb) d (35)
Delete all breakpoints? (y or n) y
(gdb) c (36) ----> enter CR in other window
Continuing.
Program received signal SIGTRAP, Trace/breakpoint trap. (38)
monitor () at ../sys/evec.c:183
183 }
(gdb) q (39)
The program is running. Quit anyway (and kill it)? (y or n) y
blade57(2)% exit
script done on Mon Feb 22 19:56:26 2010