[#4573] kgdb through uart writing to l1 get wrong number

Submitted By: Mingquan Pan

Open Date

2008-10-29 22:14:46 Close Date

2008-12-03 05:53:30

Priority:

Medium Assignee:

Sonic Zhang

Status:

Closed Fixed In Release:

N/A

Found In Release:

N/A Release:

Category:

N/A Board:

N/A

Processor:

N/A Silicon Revision:

Is this bug repeatable?:

Yes Resolution:

Rejected

Uboot version or rev.:

Toolchain version or rev.:

Oct 10

App binary format:

N/A

Summary: kgdb through uart writing to l1 get wrong number

Details:

kgdb through uart writing to l1 get wrong number.

kgdb_test.c do num1=num1+10 in l1, however, when debugging through uart port, num1 would remain 10 after the second round.

The log is:

Loading .text @ 0x00001000 (1107472 bytes)

Loading .rodata @ 0x0010f620 (279016 bytes)

Loading __ksymtab @ 0x00153808 (15488 bytes)

Loading __ksymtab_gpl @ 0x00157488 (4688 bytes)

Loading __ksymtab_strings @ 0x001586d8 (44782 bytes)

Loading __param @ 0x001635c8 (340 bytes)

Clearing .bss @ 0x00163720 (85104 bytes)

Loading .data @ 0x00178390 (64624 bytes)

Loading .init.text @ 0x00188000 (101320 bytes)

Loading .init.data @ 0x001a0bc8 (13620 bytes)

Loading .init.setup @ 0x001a40fc (700 bytes)

Loading .initcall.init @ 0x001a43b8 (496 bytes)

Loading .con_initcall.init @ 0x001a45a8 (4 bytes)

Loading .init.ramfs @ 0x001a45ac (3128340 bytes)

Loading .text_l1 @ 0xffa00000 (7256 bytes)

sh_addr: FFA00000, p_paddr: 004A01C0

Loading from: 0248D000 to 004A01C0, size: 7256

Loading .data_l1 @ 0xff800000 (224 bytes)

sh_addr: FF800000, p_paddr: 004A1E18

Loading from: 0248F000 to 004A1E18, size: 224

## Starting application at 0x001962c0 ...

Linux version 2.6.26.5-ADI-2009R1-pre-svn5497-dirty (test@uclinux50-bf537-ad9960-ad1836) (gcc version 4.1.2 (ADI svn)) #5 Wed Oct 29 13:59:12 CST 2008

Warning: limiting memory to 56MB due to hardware anomaly 05000263

Board Memory: 64MB

Kernel Managed Memory: 64MB

Memory map:

fixedcode = 0x00000400-0x00000490

text = 0x00001000-0x0010f610

rodata = 0x0010f620-0x0016371c

bss = 0x00163720-0x00178390

data = 0x00178390-0x00188000

stack = 0x00186000-0x00188000

init = 0x00188000-0x004a2000

available = 0x004a2000-0x037ff000

DMA Zone = 0x03f00000-0x04000000

Hardware Trace Active and Enabled

Reset caused by Software reset

Compiled for ADSP-BF537 Rev 0.2

Blackfin Linux support by blackfin.uclinux.org/

Processor Speed: 500 MHz core clock and 100 MHz System Clock

NOMPU: setting up cplb tables for global access

Instruction Cache Enabled

Data Cache Enabled (write-through)

Built 1 zonelists in Zone order, mobility grouping off. Total pages: 14223

Kernel command line: console=ttyBF0,57600 kgdboc=ttyBF1,57600n8

Configuring Blackfin Priority Driven Interrupts

PID hash table entries: 256 (order: 8, 1024 bytes)

console [ttyBF0] enabled

Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)

Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)

Memory available: 52016k/65536k RAM, (3176k init code, 1081k kernel code, 483k data, 1024k dma, 7756k reserved)

Security Framework initialized

Mount-cache hash table entries: 512

Blackfin Scratchpad data SRAM: 4 KB

Blackfin L1 Data A SRAM: 16 KB (15 KB free)

Blackfin L1 Data B SRAM: 16 KB (16 KB free)

Blackfin L1 Instruction SRAM: 48 KB (40 KB free)

net_namespace: 192 bytes

NET: Registered protocol family 16

Blackfin GPIO Controller

Blackfin DMA Controller

stamp_init(): registering device resources

NET: Registered protocol family 2

IP route cache hash table entries: 1024 (order: 0, 4096 bytes)

TCP established hash table entries: 2048 (order: 2, 16384 bytes)

TCP bind hash table entries: 2048 (order: 1, 8192 bytes)

TCP: Hash tables configured (established 2048 bind 2048)

TCP reno registered

NET: Registered protocol family 1

msgmni has been set to 101

io scheduler noop registered

io scheduler anticipatory registered (default)

io scheduler cfq registered

Serial: Blackfin serial driver

bfin-uart.1: ttyBF0 at MMIO 0xffc00400 (irq = 18) is a BFIN-UART

bfin-uart.1: ttyBF1 at MMIO 0xffc02000 (irq = 20) is a BFIN-UART

kgdb: Registered I/O driver kgdboc.

brd: module loaded

bfin_mac_mdio: probed

bfin_mac: attached PHY driver [SMSC LAN83C185] (mii_bus:phy_addr=0:01, irq=-1, mdc_clk=2500000Hz(mdc_div=19)@sclk=100MHz)

bfin_mac bfin_mac.0: Blackfin on-chip Ethernet MAC driver, Version 1.1

bfin-spi bfin-spi.0: Blackfin BF5xx on-chip SPI Controller Driver, Version 1.0, regs_base@ffc00500, dma channel@7

rtc-bfin rtc-bfin: rtc core: registered rtc-bfin as rtc0

TCP cubic registered

NET: Registered protocol family 17

rtc-bfin rtc-bfin: setting system clock to 1970-01-01 00:38:28 UTC (2308)

Freeing unused kernel memory: 3176k freed

_____________________________________

a8888b. / Welcome to the uClinux distribution \

d888888b. / _ _ \

8P"YP"Y88 / | | |_| __ __ (TM) |

8|o||o|88 _____/ | | _ ____ _ _ \ \/ / |

8' .88 \ | | | | _ \| | | | \ / |

8`._.' Y8. \ | |__ | | | | | |_| | / \ |

d/ `8b. \ \____||_|_| |_|\____|/_/\_\ |

dP . Y8b. \ For embedded processors including |

d8:' " `::88b \ the Analog Devices Blackfin /

d8" 'Y88b \___________________________________/

:8P ' :888

8a. : _a88P For further information, check out:

._/"Yaa_: .| 88P| - blackfin.uclinux.org/

\ YP" `| 8P `. - docs.blackfin.uclinux.org/

/ \.___.d| .' - www.uclinux.org/

`--..__)8888P`._.' jgs/a:f - www.analog.com/blackfin

Have a lot of fun...

BusyBox v1.12.1 (2008-10-29 11:24:37 CST) built-in shell (msh)

Enter 'help' for a list of built-in commands.

root:/>

#### Debugging is through uart port.

************** STEP 3: Start KGDB TEST

ifconfig eth0 10.100.4.50

root:/> PHY: 0:01 - Link is Up - 100/Full

脗SysRq : GDB

Entering KGDB

Prepare KGDB through uart port debug!spawn bfin-uclinux-gdb /tftpboot/vmlinux

GNU gdb 6.6

GDB is free software, covered by the GNU General Public License, and you are

welcome to change it and/or 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.

This GDB was configured as "--host=i686-pc-linux-gnu --target=bfin-uclinux"...

(gdb)

Case 1 ...PASS

set remotebaud 57600

(gdb)

Case 2 ...PASS

target remote /dev/ttyUSB0

Remote debugging using /dev/ttyUSB0

kgdb_breakpoint () at kernel/kgdb.c:1675

Case 2 ...PASS

1675 atomic_set(&kgdb_setting_breakpoint, 0);

(gdb) break kgdb_test

Breakpoint 1 at 0x8c16: file arch/blackfin/kernel/kgdb_test.c, line 77.

Case 3 ...PASS

(gdb) c

Continuing.

Case 4 ...PASS

B: not found

root:/> [New Thread 148]

[Switching to Thread 148]

Breakpoint 1, kgdb_test (name=<value optimized out>, len=<value optimized out>, count=<value optimized out>, z=16) at arch/blackfin/kernel/kgdb_test.c:77

Case 5 ...PASS

77 arch/blackfin/kernel/kgdb_test.c: No such file or directory.

in arch/blackfin/kernel/kgdb_test.c

(gdb) hbreak 80

Hardware assisted breakpoint 2 at 0x8c34: file arch/blackfin/kernel/kgdb_test.c, line 80.

(gdb)

Case 6 ...PASS

info b

Num Type Disp Enb Address What

1 breakpoint keep y 0x00008c16 in kgdb_test at arch/blackfin/kernel/kgdb_test.c:77

breakpoint already hit 1 time

2 hw breakpoint keep y 0x00008c34 in kgdb_test at arch/blackfin/kernel/kgdb_test.c:80

Case 7 ...PASS

(gdb) list

72 in arch/blackfin/kernel/kgdb_test.c

(gdb)

Case 8 ...PASS

#0 kgdb_test (name=<value optimized out>, len=<value optimized out>, count=<value optimized out>, z=16) at arch/blackfin/kernel/kgdb_test.c:77

Case 9 ...PASS

#1 0x00008c5a in test_proc_output (buf=<value optimized out>) at arch/blackfin/kernel/kgdb_test.c:85

#2 0x00008c7e in test_read_proc (page=0x1eb000 "", start=0x3179e64, off=0, count=3072, eof=0x3179e68, data=0x0) at arch/blackfin/kernel/kgdb_test.c:98

#3 0x0007297e in proc_file_read (file=<value optimized out>, buf=0x2e7e90 "", nbytes=4096, ppos=0x3179eec) at fs/proc/generic.c:120

#4 0x0006ecf8 in proc_reg_read (file=<value optimized out>, buf=<value optimized out>, count=<value optimized out>, ppos=0x3179eec)

at fs/proc/inode.c:189

#5 0x0004439a in vfs_read (file=0x3091ac0, buf=0x2e7e90 "", count=4096, pos=0x3179eec) at fs/read_write.c:273

#6 0x000446e6 in sys_read (fd=<value optimized out>, buf=<value optimized out>, count=4096) at fs/read_write.c:362

#7 0xffa00984 in system_call () at include/linux/rcuclassic.h:105

(gdb) c

Continuing.

cat /proc/kgdbtest

kgdb name(12): hello world!, 85, 16

Case 10 ...PASS

Breakpoint 2, kgdb_test (name=<value optimized out>, len=<value optimized out>, count=<value optimized out>, z=16) at arch/blackfin/kernel/kgdb_test.c:81

81 in arch/blackfin/kernel/kgdb_test.c

Case 11 ...PASS

(gdb) print z

$1 = 16

Case 12 ...PASS

(gdb) c

Continuing.

L1(before change) : data variable addr = 0xff800010, data value is 0

L1 : code function addr = 0xffa003ac

L1(after change) : data variable addr = 0xff800010, data val

Case 12 ...PASS

[New Thread 149]

[Switching to Thread 149]

Breakpoint 1, kgdb_test (name=<value optimized out>, len=<value optimized out>, count=<value optimized out>, z=16) at arch/blackfin/kernel/kgdb_test.c:77

77 in arch/blackfin/kernel/kgdb_test.c

(gdb) break kgdb_l1_test

Breakpoint 3 at 0xffa003ae: file arch/blackfin/kernel/kgdb_test.c, line 53.

(gdb) break 57

Breakpoint 4 at 0xffa003f2: file arch/blackfin/kernel/kgdb_test.c, line 57.

(gdb) c

Continuing.

Breakpoint 2, kgdb_test (name=<value optimized out>, len=<value optimized out>, count=<value optimized out>, z=16) at arch/blackfin/kernel/kgdb_test.c:81

81 in arch/blackfin/kernel/kgdb_test.c

(gdb) ue is 10

root:/> cat /proc/kgdbtest

kgdb name(12): hello world!, 85, 16

Case 14 ...PASS

Continuing.

Breakpoint 3, kgdb_l1_test () at arch/blackfin/kernel/kgdb_test.c:53

53 in arch/blackfin/kernel/kgdb_test.c

(gdb) print num1

$2 = 10

Case 15 ...PASS

(gdb) c

Continuing.

Breakpoint 4, kgdb_l1_test () at arch/blackfin/kernel/kgdb_test.c:58

58 in arch/blackfin/kernel/kgdb_test.c

(gdb) print num1

$3 = 10

(gdb) spawn /bin/sh

uclinux50-bf537-ad9960-ad1836:~/work/cruise/checkouts/uclinux-dist/testsuites/kgdb> ps aux | grep bfin-uclinux-gdb

test 6256 0.8 5.4 32464 27316 pts/8 Ss+ 18:41 0:00 bfin-uclinux-gdb /tftpboot/vmlinux

uclinux50-bf537-ad9960-ad1836:~/work/cruise/checkouts/uclinux-dist/testsuites/kgdb> kill -9 `pidof bfin-uclinux-gdb`

uclinux50-bf537-ad9960-ad1836:~/work/cruise/checkouts/uclinux-dist/testsuites/kgdb>

Case 16 ...FAIL

And after that running :cat /proc/kgdbtest on target would get some random number:

root:/> cat /proc/kgdbtest

kgdb name(12): hello world!, 85, 16

L1(before change) : data variable addr = 0x03780010, data value is 795764860

L1 : code function addr = 0xffa003ac

L1(after change) : data variable addr = 0x03780010, data value is 795764870

kgdb name(12): hello world!, 85, 16

L1(before change) : data variable addr = 0x03780010, data value is 795764870

L1 : code function addr = 0xffa003ac

L1(after change) : data variable addr = 0x03780010, data value is 795764880

Follow-ups

--- Sonic Zhang 2008-11-10 23:14:40

Can't replicate by following steps:

p/x num1

0x0

set num1 = 0x50

Ctrl+c

p/x num1

0x50

cat proc/kgdb_test

Ctrl+c

p/x num1

0x5a

--- Mingquan Pan 2008-12-03 05:53:30

Yeah, it should be the breakpoint stop twice issue results in this test script

running chaos and has this error. Actually this operation is right.Close.

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