JTAG

1
???????????? ????????????? ? ???????????? ?
?????????? ?????????????? ???????????? 2

• ?????????? ?? ??????? ??

??????? ????, ??????????? ??????????????
?????????? ?.?.?. ???????? ???????? ???????????
2
?????????? ??????

• ?????????? ?? ??????? ???????
• ?????????? ???????????
• ??????????? ???????????
• ?????? ??????????? ??????????
• ???? ?????????? ? ???? ??????? ?????????

3
??????? ????????? (??? ??????????? ???????)

• ?????????? ?? ?????????? ???????
• ???????? ?????????? ???????? ??????? ?????????
• ??????????? ?? ???????
• ??????????? ? ?????????? ???????????

4
?????????? ???????????

• ?????????? ? ?????????? ???. ????.
• ?????????? ???????? ??????????
• JTAG
• ????????????? ???????
• ??????????? (????????) ???????????
• ?????????? ??????????
• ??????????????????
• ??????????? ????????????? ??????????

5
?????????? ???????? ?? x86

• 6 ????????? DR0-DR3,DR6,DR7
• ????? ???????? (4 ??.)
• ?? ??????
• ?? ?????? ? ??????
• ?? ??????????
• ?? ????????? ? ????? ?????-??????.
• ?????? ?????? ??????? ?? ????????? ???????

6
?????????? ?????????? ???????? (JTAG Joint Test
Action Group)

• ????? ??????????? ?????? ? ??????? ??
  (??????????? ??????? ?? ???? ??)
• ?????????? ????? ??????? ?? ?????????? JTAG
• ??????????? ????????? ????? ????? ??????? ??,
  ????????????? ???????? ???????? ?? ???????????
  ??????
• ?????????? ???????????????? ? ????? ???????
  ????? ????????, ???????? ? ?????? ?????????

7
????????????? ???????????

• ??????????
• ??????????? ???????????
• ??????????? ? ?????????? ???????
• ?????? 1-4 ??????
• ??????????? ? ?????? ?????????
• ???????? ??????? ?????????
• ?????????? ??????????
• ???????? ??????
• ???????-????? ???????
• ??????? ??????? ??????? ? ????????? ???????????

8
?????? ?????????

• ?????????? ????????? ????????? (?????????)
  (???????-?????)
• ???? ????? ?????????? ????? ??? ??????? ?????
  ????? ?????????? (???? ?????????? ??? ?????????
  ?????)
• ? ?????? ?????? ??????? ???????? ???????? ??????
  ????? ?????????
• ????????? ????????? ??? ????????? ??????????
• ??????????????? ?????????, ????????????? ?
  ???????????? ??????????????

9
??????????? ????
Ethernet, USB, LPT
VME, PCI, PCI-Express ? ?.?.
x86-windows
???. ?????
?? ??????????? ? ??????????

• ??????-??
• Silicon Control Inc
• Curtiss-Wright Electronics systems (???. VMETRO)
• LeCroy Inc
• Tektronix Inc

10
????????? ??????????? ????

• ??????? ?????? ? ????????? ???????????
• ??? ?????????????? (??????)
• ??? ??????????

11
??? 1 ??????? ???????
12
??? 2 ????????? ?????????
13
????? ??????? ??? ???????????

• ??????????? ???????
• ??????????? ????????
• ????? ????????? ????????
• ??????? ?????? ???????????
• ??????? ?????? ??????? (??????)

14
????? ??????? ??? ??????????? (2)
15
????? ??????? (3)

• ???????????? ???????
• ??????? ?? ????????? ????? ???????? ???? (, lt,
  gt, ?? .. ??)
• ???????????? ????? ??????? (8, 32)
• ????????? ??? ????????? (?, ???, ??)
• ???????? ??????? (8 ?????????)
• ??????? ???????? ? ????? ?????????
• ??? ??????????, ???????? ? ?????? ?????????
• ?????????? ?? ???????
• ????????? ???????? ???????????? ??????

16
?????????? ????????? ????????????

• ?????????
• ????????? ?????????? ???????
• ?????? ?? ??????? ???????? ????
• ????? ?? ??????? ???????? ????
• ?????????? ??????
• ????????? ?????
• ??????????? ?????????? (API)

17
?????? ??????????????????

• ?????????????
• BusBusy, BusIdle, DataPhase, WaitState
• ?????????? ???????????
• ??? ??????, ??? ?? ???????????
• ?? ?????????? ???????
• ????????????
• Master ?? ??????????? ?????? ?? ??????? ?????
  ??????
• Target ?? ??????? ??????? ????? ?????? ??
  ???????????
• Arbitration ?? ??????? ?? ??????????

18
???????? ???????? ????

• ????????? (master)
• ?????, ?????
• ????? (?????????, ????????)
• ??????, ??????, ?????? ? ?????????
• ??????????? ?????????? (target)
• ???????? ???????
• ????? ?????? ????????
• ????? (OK, retry, fail)
• ????????????? ??????
• ???????? ? ??????????

19
???????? ????????? ????
20
??????????? ??????????? ??????? ????????????
???????

• ??????????? ????????? ???????
• strace /bin/cat

// ???????????? ???????? open("/lib/i386-linux-gnu
/libc.so.6", O_RDONLYO_CLOEXEC) 3read(3,
"\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\000
0\226\1\0004\0\0\0"..., 512) 512fstat64(3,
st_modeS_IFREG0755, st_size1734120, ...)
0mmap2(NULL, 1743580, PROT_READPROT_EXEC,
MAP_PRIVATEMAP_DENYWRITE, 3, 0)
0xb75a0000mmap2(0xb7744000, 12288,
PROT_READPROT_WRITE, MAP_PRIVATEMAP_FIXEDMAP_DE
NYWRITE, 3, 0x1a4) 0xb7744000mmap2(0xb7747000,
10972, PROT_READPROT_WRITE, MAP_PRIVATEMAP_FIXED
MAP_ANONYMOUS, -1, 0) 0xb7747000close(3)
0
21
????? strace(2)

• read(0, "fkjdfkjfd\n", 32768)
  10write(1, "fkjdfkjfd\n", 10)
  10read(0, "sdcdscdsv\n", 32768)
  10write(1, "sdcdscdsv\n", 10)
  10read(0, "fbfb\n", 32768)
  5write(1, "fbfb\n", 5)
  5read(0, "", 32768)
  0close(0)
  0close(1)
  0close(2)
  0exit_group(0) ?

22
??????????? ???????????? ???????

• ltrace /bin/cat 2gt ltrace.out

__libc_start_main(0x8049280, 1, 0xbfb66534,
0x80500d0, 0x8050140 ltunfinished
...gtgetpagesize()
4096strrchr("/bin/cat", '/')
"/cat"setlocale(6, "")

"en_US.UTF-8"bindtextdomain("coreutils",
"/usr/share/locale") "/usr/share/locale"
textdomain("coreutils")
"coreutils"__cxa_atexit(0x804a2f0, 0, 0,
0xb7769ff4, 0) 0getopt_long(1,
0xbfb66534, "benstuvAET", 0x08050840, NULL)
-1__fxstat64(3, 1, 0xbfb6641c)
0__fxstat64(3, 0, 0xbfb6641c)
0
23
??????????? ???????????? ??????? (2)
posix_fadvise64(0, 0, 0, 0, 0)
0malloc(36863)
0x097e0890read(0, "qwerty\n", 32768)
7write(1, "qwerty\n", 7)
7read(0, "", 32768)
0free(0x097e0890)
ltvoidgtclose(0)
0exit(0 ltunfinished ...gt
24
????? ? ???????????? ???????
include lttime.hgt struct timespec time_t
tv_sec int tv_usec // ????
struct tm time() sleep()
25
????????? ??????? ? ?? (2)

• /usr/bin/time myfile
• real
• user
• sys
• ??????? rdtsc ? x86 ????? ?????? ?? ? ???????
  ???????

26
?????????????? ???????? gprof

• gcc pg a.c
• a.out (????????? gmon.out)
• gprof
• ??????? 100 ??? ? ???????
• ????? ??????? ???????
• ?????, ??????????? ? ?????? ???????
• ???? ???????

27
valgrind

• valgrind myfile
• valgrind -- toolcachegrind myfile
• ???????? ????????? ??????? ???????????? ?????? ?
  ??????????? ? malloc/free
• ?????? ?????? ?????????????? ???-??????
• ?????????? ????? ??????? ???????
• ??????????? ?????????? ????????????
• www.valgrind.org

28
???????????? ?????? 1

• ????????? ??????? ?????????? ????????? (???? b.c)
• ???????????
• ??????? time
• rdtsc (??? ????????? asm ? ???)
• ????????? ????? ????????? ???
• ??? ????????? ??????? ????????????
• ????????? ??????? ?????? ???????. ??????
  ?????????? ??????
• ?????????? ?????? ?????? ??????????? ???????????

29
????????? ??? ?????? ??????? ??????????
include ltstdio.hgtdefine SIZE 10000float
aSIZESIZEvoid main( int argc, char argv
)float b int i,k b0 for( i 0 i lt
SIZE i ) for( k 0 k lt SIZE k )
b b aik
30
???????? ???????

• ????? ????? ?????? ????????? ?????????????
  ?????????????? ???????
• ??????????, ??? ??????????? ????????? ???? ??
  ???????? ???????????
• ??????????
• ????????? ????????, ??? ?????????? ? ???????