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    SubjectRe: Linux Kernel GDB tracepoint module support most collect now
    Do a small update to fix a dangerous bug.

    http://kgtp.googlecode.com/files/kgtp_20100823.tar.bz2

    Thanks,
    Hui

    On Sun, Aug 22, 2010 at 23:16, Hui Zhu <teawater@gmail.com> wrote:
    > Linux Kernel GDB tracepoint module support action X and all agent
    > expression except the trace state variable codes. So KGTP can support
    > a lot of collect command of tracepoint in x86-64 and x86-32.
    >
    > To get the new KGTP please goto http://code.google.com/p/kgtp/downloads/list
    >
    > To get more message about GDB tracepoint please goto
    > http://sourceware.org/gdb/current/onlinedocs/gdb/Tracepoints.html
    >
    > For example:
    >
    > make
    > sudo insmod gtp.ko
    > sudo gdb ./vmlinux
    >
    > (gdb) trace vfs_readdir
    > Tracepoint 1 at 0xffffffff8113f7fc: file
    > /home/teawater/kernel/linux-2.6/fs/readdir.c, line 24.
    > (gdb) actions
    > Enter actions for tracepoint 1, one per line.
    > End with a line saying just "end".
    >>collect *(unsigned char *)$rsp@512
    >>collect *file
    >>end
    > (gdb) target remote /proc/gtp
    > Remote debugging using /proc/gtp
    > 0x0000000000000000 in ?? ()
    > (gdb) tstart
    > (gdb) shell ls
    > 2      block    firmware  i        ipc     Makefile
    > modules.order   scripts   source      t~    vmlinux
    > a.out  crypto   fs        include  kernel  mm
    > Module.symvers  security  System.map  usr   vmlinux.o
    > arch   drivers  gdb.txt   init     lib     modules.builtin  net
    >     sound     t           virt
    > (gdb) tstop
    > (gdb) tfind
    > Found trace frame 0, tracepoint 1
    > #0  0xffffffff8113f7fd in vfs_readdir (file=0xffff880075f00780,
    > filler=0xffffffff8113f630 <filldir>, buf=0xffff880005785f38)
    >    at /home/teawater/kernel/linux-2.6/fs/readdir.c:24
    > 24      {
    > (gdb) bt
    > #0  0xffffffff8113f7fd in vfs_readdir (file=0xffff880075f00780,
    > filler=0xffffffff8113f630 <filldir>, buf=0xffff880005785f38)
    >    at /home/teawater/kernel/linux-2.6/fs/readdir.c:24
    > #1  0xffffffff8113fa14 in sys_getdents (fd=<value optimized out>,
    > dirent=0x801108, count=32768)
    >    at /home/teawater/kernel/linux-2.6/fs/readdir.c:214
    > #2  0xffffffff8100af42 in ?? () at
    > /home/teawater/kernel/linux-2.6/arch/x86/kernel/entry_64.S:487
    > #3  0x00007f3249a81765 in ?? ()
    > #4  0x00000018555503f7 in ?? ()
    > #5  0x0000015400000000 in ?? ()
    > #6  0x0000000000bf5048 in ?? ()
    > #7  0x0000000000000000 in ?? ()
    > (gdb) p file
    > $1 = (struct file *) 0xffff880075f00780
    > (gdb) p *file
    > $2 = {f_u = {fu_list = {next = 0xffff880075f00480, prev =
    > 0xffffe8ffffc06948}, fu_rcuhead = {next = 0xffff880075f00480,
    >      func = 0xffffe8ffffc06948}}, f_path = {mnt = 0xffff880037d92e00,
    > dentry = 0xffff8800353239c0}, f_op = 0xffffffff81622a60, f_lock = {{
    >      rlock = {raw_lock = {slock = 0}}}}, f_sb_list_cpu = 0, f_count =
    > {counter = 2}, f_flags = 624640, f_mode = 29, f_pos = 0, f_owner = {
    >    lock = {raw_lock = {lock = 16777216}}, pid = 0x0, pid_type =
    > PIDTYPE_PID, uid = 0, euid = 0, signum = 0}, f_cred =
    > 0xffff880079b40a80,
    >  f_ra = {start = 0, size = 0, async_size = 0, ra_pages = 32,
    > mmap_miss = 0, prev_pos = -1}, f_version = 0, f_security = 0x0,
    >  private_data = 0x0, f_ep_links = {next = 0xffff880075f00828, prev =
    > 0xffff880075f00828}, f_mapping = 0xffff88003539d6b8}
    > (gdb) tfind
    > Found trace frame 1, tracepoint 1
    > 0xffffffff8113f7fd      24      {
    > (gdb) bt
    > #0  0xffffffff8113f7fd in vfs_readdir (file=0xffff880075f00780,
    > filler=0xffffffff8113f630 <filldir>, buf=0xffff880005785f38)
    >    at /home/teawater/kernel/linux-2.6/fs/readdir.c:24
    > #1  0xffffffff8113fa14 in sys_getdents (fd=<value optimized out>,
    > dirent=0x801108, count=32768)
    >    at /home/teawater/kernel/linux-2.6/fs/readdir.c:214
    > #2  0xffffffff8100af42 in ?? () at
    > /home/teawater/kernel/linux-2.6/arch/x86/kernel/entry_64.S:487
    > #3  0x00007f3249a81765 in ?? ()
    > #4  0x00000018555503f7 in ?? ()
    > #5  0x0000015400000000 in ?? ()
    > #6  0x0000000000bf5048 in ?? ()
    > #7  0x0000000000000000 in ?? ()
    > (gdb) p *file
    > $3 = {f_u = {fu_list = {next = 0xffff880075f00480, prev =
    > 0xffffe8ffffc06948}, fu_rcuhead = {next = 0xffff880075f00480,
    >      func = 0xffffe8ffffc06948}}, f_path = {mnt = 0xffff880037d92e00,
    > dentry = 0xffff8800353239c0}, f_op = 0xffffffff81622a60, f_lock = {{
    >      rlock = {raw_lock = {slock = 0}}}}, f_sb_list_cpu = 0, f_count =
    > {counter = 2}, f_flags = 624640, f_mode = 29, f_pos = 2147483647,
    >  f_owner = {lock = {raw_lock = {lock = 16777216}}, pid = 0x0,
    > pid_type = PIDTYPE_PID, uid = 0, euid = 0, signum = 0},
    >  f_cred = 0xffff880079b40a80, f_ra = {start = 0, size = 0, async_size
    > = 0, ra_pages = 32, mmap_miss = 0, prev_pos = -1}, f_version = 16,
    >  f_security = 0x0, private_data = 0xffff8800755d5600, f_ep_links =
    > {next = 0xffff880075f00828, prev = 0xffff880075f00828},
    >  f_mapping = 0xffff88003539d6b8}
    >
    --
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