[#4835] set kgdb hardware breakpoint when testing through uart would have error

Submitted By: Mingquan Pan

Open Date

2009-01-22 03:37:01 Close Date

2009-03-02 05:42:49

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:

BF537 Silicon Revision:

Is this bug repeatable?:

Yes Resolution:

Duplicate

Uboot version or rev.:

Toolchain version or rev.:

Jan 17,2009

App binary format:

N/A

Summary: set kgdb hardware breakpoint when testing through uart would have error

Details:

set kgdb hardware breakpoint when testing through uart would have error.

## Booting image at 02000000 ...

Image Name: Linux-2.6.28-ADI-2009R1-pre-svn6

Created: 2009-01-20 3:50:26 UTC

Image Type: Blackfin Linux Kernel Image (gzip compressed)

Data Size: 4076248 Bytes = 3.9 MB

Load Address: 00001000

Entry Point: 001923ec

Verifying Checksum ... OK

Uncompressing Kernel Image ... OK

Starting Kernel at = 1923ec

Linux version 2.6.28-ADI-2009R1-pre-svn6027 (test@uclinux50-bf537-ad9960-ad1836) (gcc version 4.1.2 (ADI svn)) #18 Tue Jan 20 11:50:03 CST 2009

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

Board Memory: 64MB

Kernel Managed Memory: 64MB

Memory map:

fixedcode = 0x00000400-0x00000490

text = 0x00001000-0x0010cd00

rodata = 0x0010cd00-0x0015fc3c

bss = 0x0015fc40-0x00173fac

data = 0x00173fac-0x00184000

stack = 0x00182000-0x00184000

init = 0x00184000-0x007b3000

available = 0x007b3000-0x037ff000

DMA Zone = 0x03f00000-0x04000000

Hardware Trace Active and Enabled

Boot Mode: 0

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

Instruction Cache Enabled for CPU0

Data Cache Enabled for CPU0 (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: 48876k/65536k RAM, (6332k init code, 1071k kernel code, 477k data, 1024k dma, 7756k reserved)

Calibrating delay loop... 995.32 BogoMIPS (lpj=1990656)

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 (41 KB free)

PDA for CPU0 reserved at 00160e70

net_namespace: 288 bytes

NET: Registered protocol family 16

Blackfin GPIO Controller

Blackfin DMA Controller

stamp_init(): registering device resources

Hardware Trace:

0 Target : <0x0000491c> { _dump_stack + 0x0 }

Source : <0x000066a8> { _bfin_gpio_request + 0xf4 } CALL pcrel

1 Target : <0x000066a8> { _bfin_gpio_request + 0xf4 }

Source : <0x0000661c> { _bfin_gpio_request + 0x68 } IF !CC JUMP

2 Target : <0x000065ee> { _bfin_gpio_request + 0x3a }

Source : <0x000065d0> { _bfin_gpio_request + 0x1c } IF !CC JUMP

3 Target : <0x000065ce> { _bfin_gpio_request + 0x1a }

Source : <0x000060c4> { _cmp_label + 0x30 } RTS

4 Target : <0x000060bc> { _cmp_label + 0x28 }

Source : <0x000060b4> { _cmp_label + 0x20 } IF !CC JUMP

5 Target : <0x000060ae> { _cmp_label + 0x1a }

Source : <0x000060b8> { _cmp_label + 0x24 } IF CC JUMP

6 Target : <0x000060ae> { _cmp_label + 0x1a }

Source : <0x000060b8> { _cmp_label + 0x24 } IF CC JUMP

7 Target : <0x000060ae> { _cmp_label + 0x1a }

Source : <0x000060b8> { _cmp_label + 0x24 } IF CC JUMP

8 Target : <0x000060ae> { _cmp_label + 0x1a }

Source : <0x000060b8> { _cmp_label + 0x24 } IF CC JUMP

9 Target : <0x00006094> { _cmp_label + 0x0 }

Source : <0x000065ca> { _bfin_gpio_request + 0x16 } CALL pcrel

10 Target : <0x000065b4> { _bfin_gpio_request + 0x0 }

Source : <0x001927aa> { _stamp_init + 0x32 } CALL pcrel

11 Target : <0x001927a0> { _stamp_init + 0x28 }

Source : <0x001992f8> { _i2c_register_board_info + 0x9c } RTS

12 Target : <0x001992f0> { _i2c_register_board_info + 0x94 }

Source : <0x0010be32> { _mutex_unlock + 0x22 } RTS

13 Target : <0x0010be10> { _mutex_unlock + 0x0 }

Source : <0x001992ec> { _i2c_register_board_info + 0x90 } CALL pcrel

14 Target : <0x001992e2> { _i2c_register_board_info + 0x86 }

Source : <0x001992c6> { _i2c_register_board_info + 0x6a } IF !CC JUMP

15 Target : <0x001992a0> { _i2c_register_board_info + 0x44 }

Source : <0x001992dc> { _i2c_register_board_info + 0x80 } IF CC JUMP

Stack info:

SP: [0x037e1e1c] <0x037e1e1c> /* kernel dynamic memory */

FP: (0x037e1e34)

Memory from 0x037e1e10 to 037e2000

037e1e10: 00000000 037e1e1c <0010beb4>[001992d8]<000066ac> 00000000 00000003 00000000

037e1e30: 001a06b4 (00000000)<001927ae> 0015fc64 00192778 001a06b4 00000000 00000000

037e1e50: 00000000 00000000 0018a928 0010d8dc 00000001 <00001028> 00181bf0 037fd220

037e1e70: 037e0000 000040d0 00000000 00000001 000240d0 00000000 00000000 00181bf0

037e1e90: 00000001 00000044 037e0000 037e0000 037e0000 000240d0 037e0000 00000010

037e1eb0: 007c8b60 00000000 00000000 00000000 00000000 00000000 00000000 00000000

037e1ed0: 00000000 ffffffff 037e1f08 <0008ae0e> 00179a88 0016f054 0016fb5c <0008ae82>

037e1ef0: 037fb6a4 00000000 000000d2 0016fb5c 000000d0 037e1f08 037e8e10 00000000

037e1f10: 00000000 001a06b4 <0008afe6> 0016fb5c 0016f054 00000000 <00070158> 00179a88

037e1f30: 0016f054 001a06b4 037e1f5c 0085b4a0 0085a300 00000000 00000000 0016fb5c

037e1f50: 037e1f5c <001420f8><00070374> 000000d2 <00070382> 00179a88 0085b4a0 00004000

037e1f70: 00000000 00000000 037e1f9c 7fffff00 00000001 <00031e6e> 037e1f9c 00000061

037e1f90:<00070446> 001a0474 0085a300 00003739 00000000 00190000 <00031eca> 001783c8

037e1fb0: 001a0474 00000061 00179a88 <001843b0> 001a04c8 001a0474 00000000 00000000

037e1fd0: 00000000 00000000 00000000 00000000 00000000 <0000145e> 00000000 00000000

037e1ff0: 00000000 00000000 ffffffff 00000006 037f74a0

Return addresses in stack:

address : <0x0010beb4> { _mutex_lock + 0xc }

address : <0x001992d8> { _i2c_register_board_info + 0x7c }

address : <0x000066ac> { _bfin_gpio_request + 0xf8 }

frame 1 : <0x001927ae> { _stamp_init + 0x36 }

address : <0x00001028> { _do_one_initcall + 0x28 }

address : <0x0008ae0e> { _ida_get_new_above + 0x96 }

address : <0x0008ae82> { _ida_get_new_above + 0x10a }

address : <0x0008afe6> { _ida_pre_get + 0xe }

address : <0x00070158> { _proc_register + 0x30 }

address : <0x001420f8> /* kernel dynamic memory */

address : <0x00070374> { _create_proc_entry + 0x3c }

address : <0x00070382> { _create_proc_entry + 0x4a }

address : <0x00031e6e> { _register_irq_proc + 0x76 }

address : <0x00070446> { _proc_mkdir_mode + 0x2e }

address : <0x00031eca> { _init_irq_proc + 0x42 }

address : <0x001843b0> { _kernel_init + 0x84 }

address : <0x0000145e> { _kernel_thread_helper + 0x6 }

bfin-gpio: GPIO 3 is already reserved as Peripheral by bfin-uart !

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 95

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 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 1971-10-09 19:40:28 UTC (55885228)

Freeing unused kernel memory: 6332k 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 v1.13.2 (2009-01-20 08:05:31 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 /home/test/work/cruise/checkouts/uclinux-dist/linux-2.6.x/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:1722

Case 2 ...PASS

1722 atomic_set(&kgdb_setting_breakpoint, 0);

(gdb) break kgdb_test

Breakpoint 1 at 0x86ae: file arch/blackfin/kernel/kgdb_test.c, line 54.

Case 3 ...PASS

(gdb) c

Continuing.

Case 4 ...PASS

B: not found

root:/> [New Thread 159]

[Switching to Thread 159]

Breakpoint 1, kgdb_test (name=0x8700 "J谩聽每\n谩\220\003b", len=1103916,

Case 5 ...PASS

count=12, z=85) at arch/blackfin/kernel/kgdb_test.c:54

54 printk(KERN_DEBUG "kgdb name(%d): %s, %d, %d\n", len, name, count, z);

(gdb) hbreak 56

Hardware assisted breakpoint 2 at 0x86d4: file arch/blackfin/kernel/kgdb_test.c, line 56.

(gdb)

Case 6 ...PASS

info b

Num Type Disp Enb Address What

1 breakpoint keep y 0x000086ae in kgdb_test

at arch/blackfin/kernel/kgdb_test.c:54

breakpoint already hit 1 time

2 hw breakpoint keep y 0x000086d4 in kgdb_test

Case 7 ...PASS

at arch/blackfin/kernel/kgdb_test.c:56

(gdb) list

49 #endif

52 int kgdb_test(char *name, int len, int count, int z)

53 {

54 printk(KERN_DEBUG "kgdb name(%d): %s, %d, %d\n", len, name, count, z);

55 count = z;

56 return count;

57 }

(gdb)

Case 8 ...PASS

#0 kgdb_test (name=0x8700 "J谩聽每\n谩\220\003b", len=1103916, count=12, z=85)

at arch/blackfin/kernel/kgdb_test.c:54

Case 9 ...PASS

#1 0x00001000 in ?? ()

#2 0x00008700 in test_proc_output (buf=0x0)

at arch/blackfin/kernel/kgdb_test.c:61

#3 0x00000000 in ?? ()

(gdb) c

Continuing.

cat /proc/kgdbtest

L1(before change) : data variable addr = 0xff800000, data value is 0

L1 : code function addr = 0xffa00390

L1(after change) : data variable addr = 0xff800000, data value is 10

NULL pointer access

Program received signal SIGSEGV, Segmentation fault.

0x00000000 in ?? ()

(gdb) spawn /bin/sh

db> ps aux | grep bfin-uclinux-gdbrk/cruise/checkouts/uclinux-dist/testsuites/kgd

test 19295 1.0 5.2 31340 26392 pts/4 Ss+ 11:51 0:00 bfin-uclinux-gdb /home/test/work/cruise/checkouts/uclinux-dist/linux-2.6.x/vmlinux

test 19308 0.0 0.1 3064 732 pts/5 S+ 11:52 0:00 grep bfin-uclinux-gdb

db> kill -9 `pidof bfin-uclinux-gdb`cruise/checkouts/uclinux-dist/testsuites/kgd

db> nux50-bf537-ad9960-ad1836:~/work/cruise/checkouts/uclinux-dist/testsuites/kgd

Case 11 ...FAIL

It is expected to stop at hbreakpoint2 56, but slip over it.

Follow-ups

--- Sonic Zhang 2009-02-03 23:23:09

Can't replicate.

--- Sonic Zhang 2009-02-03 23:25:44

(gdb)

Case 8 ...PASS

#0 kgdb_test (name=0x1112c8 "hello world!", len=12, count=85, z=16)

at arch/blackfin/kernel/kgdb_test.c:54

Case 9 ...PASS

#1 0x00008984 in test_proc_output (buf=0x838000 "") at

arch/blackfin/kernel/kgdb_test.c:61

#2 0x000089ae in test_read_proc (page=0x838000 "", start=0x835e64,

off=0, count=3072,

eof=0x835e68, data=0x0) at arch/blackfin/kernel/kgdb_test.c:75

#3 0x00071c2c in proc_file_read (file=<value optimized out>,

buf=0x3e8e90 "", nbytes=4096,

ppos=0x835eec) at fs/proc/generic.c:120

#4 0x0006e0a0 in proc_reg_read (file=<value optimized out>,

buf=<value optimized out>,

count=<value optimized out>, ppos=0x835eec) at fs/proc/inode.c:191

#5 0x000442cc in vfs_read (file=0x30a9b60, buf=0x3e8e90 "",

count=4096, pos=0x835eec)

at fs/read_write.c:279

#6 0x00044504 in sys_read (fd=<value optimized out>, buf=<value

optimized out>, count=4096)

at fs/read_write.c:368

#7 0xffa008dc in system_call () at include/linux/rcuclassic.h:122

(gdb) c

Continuing.

cat /proc/kgdbtest

<7>kgdb name(12): hello world!, 85, 16

Case 10 ...PASS

Breakpoint 2, kgdb_test (name=0x1112c8 "hello world!", len=12,

count=16, z=16)

at arch/blackfin/kernel/kgdb_test.c:56

56 return count;

Case 11 ...PASS

(gdb) print z

$1 = 16

Case 12 ...PASS

(gdb) c

Continuing.

L1(before change) : data variable addr = 0xff800000, data value is 0

L1 : code function addr = 0xffa003a4

L1(after change) : data variable addr = 0xff800000, data value is 10

Case 12 ...PASS

--- Mingquan Pan 2009-02-16 23:13:55

This bug should be happening again on trunk head from about Feb 10. And probably

duplicated with bug [4911].

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[#4835] set kgdb hardware breakpoint when testing through uart would have error