yocto@lists.yoctoproject.org | Unable to get serial console login prompt

Elvis Dowson

Hi,

I am unable to get a serial console login prompt using yocto generate rootfilesystem (core-image-minimal), for a PowerPC 440 target.

I saw on another thread that even for the pandaboard, a similar situation exists:

On 2012-07-30 13:11, Gary Thomas wrote:

On 2012-07-30 12:49, Jim Abernathy wrote:

On 07/30/2012 01:16 PM, Gary Thomas wrote:

I got core-image-minimal built without errors, Thanks, now I need to ask some questions about booting that image. I'm assuming that I can follow the instructions on pandaboard.org

for creating the SD card format and just copy the deploy/image/ u-boot, MLO, uImage, and rootfs to the right places and boot the sdcard in the pandaboard. Anyway, that's what I

tried. I'm connected to the panadboard via serial port and the U-Boot works and the uImage seems to be found, but I don't get a login console on the serial port:

U-Boot SPL 2011.12-dirty (Jul 30 2012 - 13:44:03)

Texas Instruments OMAP4430 ES2.1

OMAP SD/MMC: 0

reading u-boot.img

U-Boot 2011.12-dirty (Jul 30 2012 - 13:44:03)

CPU : OMAP4430 ES2.1

Board: OMAP4 Panda

I2C: ready

DRAM: 1 GiB

MMC: OMAP SD/MMC: 0

Using default environment

In: serial

Out: serial

Err: serial

Hit any key to stop autoboot: 0

reading boot.scr

** Unable to read "boot.scr" from mmc 0:1 **

reading uImage

4176404 bytes read

Booting from mmc0 ...

## Booting kernel from Legacy Image at 82000000 ...

Image Name: Linux-3.1.0

Image Type: ARM Linux Kernel Image (uncompressed)

Data Size: 4176340 Bytes = 4 MiB

Load Address: 80008000

Entry Point: 80008000

Verifying Checksum ... OK

Loading Kernel Image ... OK

OK

Starting kernel ...

Uncompressing Linux... done, booting the kernel.

Start with the obvious - check the bootparams in U-Boot. Break into

the boot process and run the 'printenv' command. What's the value of

the "console" variable?

n.b. I've not tried this exact setup on the PandaBoard. I may have time

later today to do so.

I've just verified that this does fail when using yocto:master I'm pretty

sure that the problem is related to the use of GCC 4.7.1 - I've had similar

problems with ARM kernels & GCC 4.7.1 in the past.

Can someone confirm?

Any suggestions on how to get past this issue? Is serial console login prompt broken on yocto for targets other than Intel? Does it work on ARM or PowerPC at the moment, with the latest yocto updates as of today?

My /etc/inittab looks like this:

S:2345:respawn:/sbin/getty 9600 ttyS0

Here is the output of my kernel boot screen:

zImage starting: loaded at 0x00800000 (sp: 0x00d71fb0)

Allocating 0x4cea6c bytes for kernel ...

gunzipping (0x00000000 <- 0x0080f000:0x009ddcf9)...done 0x3b15c0 bytes

Attached initrd image at 0x009de000-0x00d7088a

initrd head: 0x1f8b0808

Linux/PowerPC load: console=ttyS0 ip=off root=/dev/ram rw

Finalizing device tree... flat tree at 0xd7e0e0

[ 0.000000] Using Xilinx Virtex440 machine description

[ 0.000000] Linux version 3.3.0-14.2-build1+ (elvis@eos) (gcc version 4.7.2 20120706 (prerelease) (GCC) ) #37 PREEMPT Tue Jul 31 21:12:34 GST 2012

[ 0.000000] Found initrd at 0xc09de000:0xc0d7088a

[ 0.000000] Zone PFN ranges:

[ 0.000000] DMA 0x00000000 -> 0x00010000

[ 0.000000] Normal empty

[ 0.000000] Movable zone start PFN for each node

[ 0.000000] Early memory PFN ranges

[ 0.000000] 0: 0x00000000 -> 0x00010000

[ 0.000000] MMU: Allocated 1088 bytes of context maps for 255 contexts

[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 65024

[ 0.000000] Kernel command line: console=ttyS0 ip=off root=/dev/ram rw

[ 0.000000] PID hash table entries: 1024 (order: 0, 4096 bytes)

[ 0.000000] Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)

[ 0.000000] Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)

[ 0.000000] Memory: 251200k/262144k available (3596k kernel code, 10944k reserved, 188k data, 1138k bss, 148k init)

[ 0.000000] Kernel virtual memory layout:

[ 0.000000] * 0xfffdf000..0xfffff000 : fixmap

[ 0.000000] * 0xfde00000..0xfe000000 : consistent mem

[ 0.000000] * 0xfde00000..0xfde00000 : early ioremap

[ 0.000000] * 0xd1000000..0xfde00000 : vmalloc & ioremap

[ 0.000000] NR_IRQS:512

[ 0.000000] clocksource: timebase mult[2800000] shift[24] registered

[ 0.000000] Console: colour dummy device 80x25

[ 0.000455] pid_max: default: 32768 minimum: 301

[ 0.000815] Mount-cache hash table entries: 512

[ 0.008275] NET: Registered protocol family 16

[ 0.014106] PCI: Probing PCI hardware

[ 0.041141] bio: create slab <bio-0> at 0

[ 0.042516] gpiochip_add: registered GPIOs 248 to 255 on device: /plb@0/gpio@81460000

[ 0.043034] gpiochip_add: registered GPIOs 240 to 247 on device: /plb@0/gpio@81440000

[ 0.043625] gpiochip_add: registered GPIOs 235 to 239 on device: /plb@0/gpio@81420000

[ 0.044150] gpiochip_add: registered GPIOs 230 to 234 on device: /plb@0/gpio@81400000

[ 0.045659] vgaarb: loaded

[ 0.049556] Switching to clocksource timebase

[ 0.088781] NET: Registered protocol family 2

[ 0.089206] IP route cache hash table entries: 2048 (order: 1, 8192 bytes)

[ 0.090770] TCP established hash table entries: 8192 (order: 4, 65536 bytes)

[ 0.091141] TCP bind hash table entries: 8192 (order: 3, 32768 bytes)

[ 0.091343] TCP: Hash tables configured (established 8192 bind 8192)

[ 0.091361] TCP reno registered

[ 0.091381] UDP hash table entries: 256 (order: 0, 4096 bytes)

[ 0.091425] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)

[ 0.092019] NET: Registered protocol family 1

[ 0.092849] RPC: Registered named UNIX socket transport module.

[ 0.092879] RPC: Registered udp transport module.

[ 0.092892] RPC: Registered tcp transport module.

[ 0.092906] RPC: Registered tcp NFSv4.1 backchannel transport module.

[ 0.093223] Trying to unpack rootfs image as initramfs...

[ 0.095276] rootfs image is not initramfs (no cpio magic); looks like an initrd

[ 0.128489] Freeing initrd memory: 3660k freed

[ 0.146291] msgmni has been set to 499

[ 0.147734] io scheduler noop registered

[ 0.147760] io scheduler deadline registered

[ 0.147911] io scheduler cfq registered (default)

[ 0.180521] Console: switching to colour frame buffer device 80x30

[ 0.444482] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled

[ 0.450055] 83e00000.serial: ttyS0 at MMIO 0x83e01003 (irq = 20) is a 16550

[ 4.334314] console [ttyS0] enabled

[ 4.395802] brd: module loaded

[ 4.441798] loop: module loaded

[ 4.478911] xsysace 83600000.sysace: Xilinx SystemACE revision 1.0.12

[ 4.555785] xsysace 83600000.sysace: No CF in slot

[ 4.614718] Xilinx SystemACE device driver, major=254

[ 4.675508] xilinx_emaclite 81000000.ethernet: Device Tree Probing

[ 4.749052] xilinx_emaclite 81000000.ethernet: error registering MDIO bus

[ 4.830133] xilinx_emaclite 81000000.ethernet: MAC address is now 00:0a:35:b7:78:00

[ 4.923700] xilinx_emaclite 81000000.ethernet: Xilinx EmacLite at 0x81000000 mapped to 0xD10A0000, irq=17

[ 5.038540] xilinx_ps2 81480000.ps2: Device Tree Probing 'ps2'

[ 5.107812] xilinx_ps2 81480000.ps2: Xilinx PS2 at 0x81480000 mapped to 0xd1036000, irq=22

[ 5.207016] xilinx_ps2 81481000.ps2: Device Tree Probing 'ps2'

[ 5.276713] xilinx_ps2 81481000.ps2: Xilinx PS2 at 0x81481000 mapped to 0xd1038000, irq=23

[ 5.377147] mousedev: PS/2 mouse device common for all mice

[ 5.444373] i2c /dev entries driver

[ 5.485910] Device Tree Probing 'i2c'

[ 5.530167] xilinx-iic #0 at 0x81600000 mapped to 0xD10C0000, irq=18

[ 5.607687] TCP cubic registered

[ 5.645541] NET: Registered protocol family 17

[ 6.441625] atkbd serio0: keyboard reset failed on xilinxps2/serio at 81480000

[ 6.925869] RAMDISK: gzip image found at block 0

[ 7.449824] input: AT Raw Set 2 keyboard as /devices/plb.0/xps-ps2.1/81481000.ps2/serio1/input/input0

[ 7.834586] VFS: Mounted root (ext2 filesystem) readonly on device 1:0.

[ 7.914175] Freeing unused kernel memory: 148k freed

Best regards,

Elvis Dowson

#8399

Hi,

On Jul 31, 2012, at 9:27 PM, Elvis Dowson wrote:

I am unable to get a serial console login prompt using yocto generate rootfilesystem (core-image-minimal), for a PowerPC 440 target.

I'm now starting the process of debugging the init process step by step.

I've just updated to the latest gcc-4.7.2 commit, as of today

SRCREV = "1653160670db186c6243997447ecbe6ce5056648"

I've created a simple hello world program, and used that as init, and I get an output as expected:

zImage starting: loaded at 0x00800000 (sp: 0x00d7bfb0)

Allocating 0x540e0c bytes for kernel ...

gunzipping (0x00000000 <- 0x0080f000:0x00a17dda)...done 0x4235c0 bytes

Attached initrd image at 0x00a18000-0x00d7a3e1

initrd head: 0x1f8b0808

Linux/PowerPC load: console=ttyS0,9600n8 ip=off root=/dev/ram rw rootwait init=/init

Finalizing device tree... flat tree at 0xd880e0

PM: Adding info for No Bus:ttyv9

[ 0.476678] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled

[ 0.481983] 83e00000.serial: ttyS0 at MMIO 0x83e01003 (irq = 20) is a 16550

[ 0.677477] console [ttyS0] enabled

[ 0.741448] brd: module loaded

[ 0.788283] loop: module loaded

[ 0.825575] xsysace 83600000.sysace: Xilinx SystemACE revision 1.0.12

[ 0.902300] xsysace 83600000.sysace: No CF in slot

[ 0.961302] Xilinx SystemACE device driver, major=254

[ 1.022246] xilinx_emaclite 81000000.ethernet: Device Tree Probing

[ 1.095778] xilinx_emaclite 81000000.ethernet: error registering MDIO bus

[ 1.176850] xilinx_emaclite 81000000.ethernet: MAC address is now 00:0a:35:b7:78:00

[ 1.270544] xilinx_emaclite 81000000.ethernet: Xilinx EmacLite at 0x81000000 mapped to 0xD10A0000, irq=17

[ 1.385416] xilinx_ps2 81480000.ps2: Device Tree Probing 'ps2'

[ 1.454651] xilinx_ps2 81480000.ps2: Xilinx PS2 at 0x81480000 mapped to 0xd1036000, irq=22

[ 1.554024] xilinx_ps2 81481000.ps2: Device Tree Probing 'ps2'

[ 1.623705] xilinx_ps2 81481000.ps2: Xilinx PS2 at 0x81481000 mapped to 0xd1038000, irq=23

[ 1.724252] mousedev: PS/2 mouse device common for all mice

[ 1.791648] i2c /dev entries driver

[ 1.833441] Device Tree Probing 'i2c'

[ 1.877646] xilinx-iic #0 at 0x81600000 mapped to 0xD10C0000, irq=18

[ 1.955298] TCP cubic registered

[ 1.993143] NET: Registered protocol family 17

[ 2.790356] atkbd serio0: keyboard reset failed on xilinxps2/serio at 81480000

[ 3.274628] RAMDISK: gzip image found at block 0

[ 3.798553] input: AT Raw Set 2 keyboard as /devices/plb.0/xps-ps2.1/81481000.ps2/serio1/input/input0

[ 4.178791] VFS: Mounted root (ext2 filesystem) on device 1:0.

[ 4.248993] Freeing unused kernel memory: 152k freed

Hello world from myinit.c!

Inside the ramdisk, I just have a /dev folder, and it has nodes for console and ttyS0. So this means that the Xilinx hardware project using xps_uart16550_v3_00_a and the kernel drivers, etc, are all working.

Now to try to debug the init process.

Best regards,

Elvis Dowson

#8400

Hi,

On Aug 4, 2012, at 12:59 AM, Elvis Dowson wrote:

Now to try to debug the init process.

I compiled bash statically by making the following changes:

diff --git a/meta/recipes-extended/bash/bash.inc b/meta/recipes-extended/bash/bash.inc

index 3684191..071d79e 100644

--- a/meta/recipes-extended/bash/bash.inc

+++ b/meta/recipes-extended/bash/bash.inc

@@ -11,7 +11,7 @@ inherit autotools gettext update-alternatives

PARALLEL_MAKE = ""

-EXTRA_OECONF = "--enable-job-control"

+EXTRA_OECONF = "--enable-job-control --without-gnu-malloc --enable-static-link"

export CC_FOR_BUILD = "${BUILD_CC}"

ALTERNATIVE_${PN} = "sh"

That seems to be working!

zImage starting: loaded at 0x00800000 (sp: 0x00d38fb0)

Allocating 0x540e0c bytes for kernel ...

gunzipping (0x00000000 <- 0x0080f000:0x00a17ddd)...done 0x4235c0 bytes

Attached initrd image at 0x00a18000-0x00d3797b

initrd head: 0x1f8b0808

Linux/PowerPC load: console=ttyS0,9600n8 ip=off root=/dev/ram rw rootwait init=/bash

Finalizing device tree... flat tree at 0xd450e0

PM: Adding info for No Bus:ttyv9

[ 0.473944] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled

[ 0.479429] 83e00000.serial: ttyS0 at MMIO 0x83e01003 (irq = 20) is a 16550

[ 0.674847] console [ttyS0] enabled

[ 0.738939] brd: module loaded

[ 0.785690] loop: module loaded

[ 0.823018] xsysace 83600000.sysace: Xilinx SystemACE revision 1.0.12

[ 0.899716] xsysace 83600000.sysace: No CF in slot

[ 0.958789] Xilinx SystemACE device driver, major=254

[ 1.019641] xilinx_emaclite 81000000.ethernet: Device Tree Probing

[ 1.093183] xilinx_emaclite 81000000.ethernet: error registering MDIO bus

[ 1.174263] xilinx_emaclite 81000000.ethernet: MAC address is now 00:0a:35:b7:78:00

[ 1.267929] xilinx_emaclite 81000000.ethernet: Xilinx EmacLite at 0x81000000 mapped to 0xD10A0000, irq=17

[ 1.382861] xilinx_ps2 81480000.ps2: Device Tree Probing 'ps2'

[ 1.452151] xilinx_ps2 81480000.ps2: Xilinx PS2 at 0x81480000 mapped to 0xd1036000, irq=22

[ 1.551544] xilinx_ps2 81481000.ps2: Device Tree Probing 'ps2'

[ 1.621222] xilinx_ps2 81481000.ps2: Xilinx PS2 at 0x81481000 mapped to 0xd1038000, irq=23

[ 1.721705] mousedev: PS/2 mouse device common for all mice

[ 1.789048] i2c /dev entries driver

[ 1.830824] Device Tree Probing 'i2c'

[ 1.874996] xilinx-iic #0 at 0x81600000 mapped to 0xD10C0000, irq=18

[ 1.952627] TCP cubic registered

[ 1.990531] NET: Registered protocol family 17

[ 2.786413] atkbd serio0: keyboard reset failed on xilinxps2/serio at 81480000

[ 3.270686] RAMDISK: gzip image found at block 0

[ 3.794609] input: AT Raw Set 2 keyboard as /devices/plb.0/xps-ps2.1/81481000.ps2/serio1/input/input0

[ 4.158841] VFS: Mounted root (ext2 filesystem) on device 1:0.

[ 4.229004] Freeing unused kernel memory: 152k freed

bash: cannot set terminal process group (-1): Inappropriate ioctl for device

bash: no job control in this shell

bash-4.2#

I get a bash shell prompt with no issues.

Not sure at this moment, if it was the updates to gcc-4.7.2 that fixed the problem or if there is still a problem with the init scripts.

I'll try to switch back to a non-static bash, and try booting the core-image-minimal filesystem once again.

Best regards,

Elvis Dowson

#8401

Hi,

On Aug 4, 2012, at 1:30 AM, Elvis Dowson wrote:

I'll try to switch back to a non-static bash, and try booting the core-image-minimal filesystem once again.

Switching back to the core-image-default non-static bash version, didn't work. I get no bash prompt, even through I specified init=/bin/sh for the kernel bootargs

zImage starting: loaded at 0x00800000 (sp: 0x00dacfb0)

Allocating 0x540e0c bytes for kernel ...

gunzipping (0x00000000 <- 0x0080f000:0x00a17ddd)...done 0x4235c0 bytes

Attached initrd image at 0x00a18000-0x00dab775

initrd head: 0x1f8b0808

Linux/PowerPC load: console=ttyS0,9600n8 ip=off root=/dev/ram rw rootwait init=/bin/sh

Finalizing device tree... flat tree at 0xdb90e0

PM: Adding info for No Bus:ttyv9

[ 0.478914] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled

[ 0.484189] 83e00000.serial: ttyS0 at MMIO 0x83e01003 (irq = 20) is a 16550

[ 0.679634] console [ttyS0] enabled

[ 0.743646] brd: module loaded

[ 0.790371] loop: module loaded

[ 0.827695] xsysace 83600000.sysace: Xilinx SystemACE revision 1.0.12

[ 0.904387] xsysace 83600000.sysace: No CF in slot

[ 0.963434] Xilinx SystemACE device driver, major=254

[ 1.024322] xilinx_emaclite 81000000.ethernet: Device Tree Probing

[ 1.097851] xilinx_emaclite 81000000.ethernet: error registering MDIO bus

[ 1.178937] xilinx_emaclite 81000000.ethernet: MAC address is now 00:0a:35:b7:78:00

[ 1.272553] xilinx_emaclite 81000000.ethernet: Xilinx EmacLite at 0x81000000 mapped to 0xD10A0000, irq=17

[ 1.387465] xilinx_ps2 81480000.ps2: Device Tree Probing 'ps2'

[ 1.456732] xilinx_ps2 81480000.ps2: Xilinx PS2 at 0x81480000 mapped to 0xd1036000, irq=22

[ 1.556112] xilinx_ps2 81481000.ps2: Device Tree Probing 'ps2'

[ 1.625786] xilinx_ps2 81481000.ps2: Xilinx PS2 at 0x81481000 mapped to 0xd1038000, irq=23

[ 1.726276] mousedev: PS/2 mouse device common for all mice

[ 1.793618] i2c /dev entries driver

[ 1.835429] Device Tree Probing 'i2c'

[ 1.879626] xilinx-iic #0 at 0x81600000 mapped to 0xD10C0000, irq=18

[ 1.957193] TCP cubic registered

[ 1.995099] NET: Registered protocol family 17

[ 2.790435] atkbd serio0: keyboard reset failed on xilinxps2/serio at 81480000

[ 3.274705] RAMDISK: gzip image found at block 0

[ 3.681850] atkbd serio1: Frame/parity error: 02

[ 3.858630] input: AT Raw Set 2 keyboard as /devices/plb.0/xps-ps2.1/81481000.ps2/serio1/input/input0

[ 4.242871] VFS: Mounted root (ext2 filesystem) on device 1:0.

[ 4.313049] Freeing unused kernel memory: 152k freed

What should I do now to debug this issue further?

I have disabled image-prelink by not including it in my local.conf as follows:

# Remove image-prelink for PowerPC 32-bit and 64-bit targets.

USER_CLASSES ?= "buildstats image-mklibs"

Any thoughts on what I can try to do next, to narrow down the issue, with bash working statically, but not when linked with shared libraries?

Best regards,

Elvis Dowson

Tim Bird <tim.bird@...>

#8402

On 08/03/2012 03:05 PM, Elvis Dowson wrote:
Hi,

On Aug 4, 2012, at 1:30 AM, Elvis Dowson wrote:

I'll try to switch back to a non-static bash, and try booting the 
core-image-minimal filesystem once again.Switching back to the core-image-default non-static bash version, didn't work. I 
get no bash prompt, even through I specified init=/bin/sh for the kernel bootargs

zImage starting: loaded at 0x00800000 (sp: 0x00dacfb0)
Allocating 0x540e0c bytes for kernel ...
gunzipping (0x00000000 <- 0x0080f000:0x00a17ddd)...done 0x4235c0 bytes
Attached initrd image at 0x00a18000-0x00dab775
initrd head: 0x1f8b0808

Linux/PowerPC load: console=ttyS0,9600n8 ip=off root=/dev/ram rw rootwait 
init=/bin/sh
Finalizing device tree... flat tree at 0xdb90e0
  PM: Adding info for No Bus:ttyv9
[    0.478914] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
[    0.484189] 83e00000.serial: ttyS0 at MMIO 0x83e01003 (irq = 20) is a 16550
[    0.679634] console [ttyS0] enabled
[    0.743646] brd: module loaded
[    0.790371] loop: module loaded
[    0.827695] xsysace 83600000.sysace: Xilinx SystemACE revision 1.0.12
[    0.904387] xsysace 83600000.sysace: No CF in slot
[    0.963434] Xilinx SystemACE device driver, major=254
[    1.024322] xilinx_emaclite 81000000.ethernet: Device Tree Probing
[    1.097851] xilinx_emaclite 81000000.ethernet: error registering MDIO bus
[    1.178937] xilinx_emaclite 81000000.ethernet: MAC address is now 
00:0a:35:b7:78:00
[    1.272553] xilinx_emaclite 81000000.ethernet: Xilinx EmacLite at 0x81000000 
mapped to 0xD10A0000, irq=17
[    1.387465] xilinx_ps2 81480000.ps2: Device Tree Probing 'ps2'
[    1.456732] xilinx_ps2 81480000.ps2: Xilinx PS2 at 0x81480000 mapped to 
0xd1036000, irq=22
[    1.556112] xilinx_ps2 81481000.ps2: Device Tree Probing 'ps2'
[    1.625786] xilinx_ps2 81481000.ps2: Xilinx PS2 at 0x81481000 mapped to 
0xd1038000, irq=23
[    1.726276] mousedev: PS/2 mouse device common for all mice
[    1.793618] i2c /dev entries driver
[    1.835429] Device Tree Probing 'i2c'
[    1.879626] xilinx-iic #0 at 0x81600000 mapped to 0xD10C0000, irq=18
[    1.957193] TCP cubic registered
[    1.995099] NET: Registered protocol family 17
[    2.790435] atkbd serio0: keyboard reset failed on xilinxps2/serio at 81480000
[    3.274705] RAMDISK: gzip image found at block 0
[    3.681850] atkbd serio1: Frame/parity error: 02
[    3.858630] input: AT Raw Set 2 keyboard as 
/devices/plb.0/xps-ps2.1/81481000.ps2/serio1/input/input0
[    4.242871] VFS: Mounted root (ext2 filesystem) on device 1:0.
[    4.313049] Freeing unused kernel memory: 152k freed

What should I do now to debug this issue further?

I have disabled image-prelink by not including it in my local.conf as follows:

# Remove image-prelink for PowerPC 32-bit and 64-bit targets.
USER_CLASSES ?= "buildstats image-mklibs"

Any thoughts on what I can try to do next, to narrow down the issue, with bash 
working statically, but not when linked with shared libraries?I haven't debugged a static vs. dynamic boot-time issue for some years, but here
are a few ideas off the top of my head.

First, use readelf or objdump to validate where the binary is expecting to load the
dynamic linker from (that is, what directory path).  Check that the linker and
all libraries are in the proper places (in the paths as specified in the ELF
headers for the program - bash in this case).

Second, try instrumenting (ie adding printks to) the loader path, and see if the kernel
knows what is failing.  The way dynamic linking works is that the kernel loads the
program image (ELF file), and treats the dynamic linker (ldlinux.so) as it's "interpreter".
If you're not seeing an attempt to load the interpreter, then something is going wrong.
You could instrument the kernel "open" path to see all the files that are being opened
during the boot.  ldlinux.so should be one of them.  The linker should then be trying
to load the other libraries needed by the program.  This should also result in open
calls (or possibly mmap calls).

Good luck.
 -- Tim

=============================
Tim Bird
Architecture Group Chair, CE Workgroup of the Linux Foundation
Senior Staff Engineer, Sony Network Entertainment
=============================

Khem Raj

#8403

On Aug 3, 2012, at 3:05 PM, Elvis Dowson <elvis.dowson@...> wrote:

Hi,

On Aug 4, 2012, at 1:30 AM, Elvis Dowson wrote:

I'll try to switch back to a non-static bash, and try booting the core-image-minimal filesystem once again.

Switching back to the core-image-default non-static bash version, didn't work. I get no bash prompt, even through I specified init=/bin/sh for the kernel bootargs

zImage starting: loaded at 0x00800000 (sp: 0x00dacfb0)
Allocating 0x540e0c bytes for kernel ...
gunzipping (0x00000000 <- 0x0080f000:0x00a17ddd)...done 0x4235c0 bytes
Attached initrd image at 0x00a18000-0x00dab775
initrd head: 0x1f8b0808

Linux/PowerPC load: console=ttyS0,9600n8 ip=off root=/dev/ram rw rootwait init=/bin/sh
Finalizing device tree... flat tree at 0xdb90e0
PM: Adding info for No Bus:ttyv9
[ 0.478914] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
[ 0.484189] 83e00000.serial: ttyS0 at MMIO 0x83e01003 (irq = 20) is a 16550
[ 0.679634] console [ttyS0] enabled
[ 0.743646] brd: module loaded
[ 0.790371] loop: module loaded
[ 0.827695] xsysace 83600000.sysace: Xilinx SystemACE revision 1.0.12
[ 0.904387] xsysace 83600000.sysace: No CF in slot
[ 0.963434] Xilinx SystemACE device driver, major=254
[ 1.024322] xilinx_emaclite 81000000.ethernet: Device Tree Probing
[ 1.097851] xilinx_emaclite 81000000.ethernet: error registering MDIO bus
[ 1.178937] xilinx_emaclite 81000000.ethernet: MAC address is now 00:0a:35:b7:78:00
[ 1.272553] xilinx_emaclite 81000000.ethernet: Xilinx EmacLite at 0x81000000 mapped to 0xD10A0000, irq=17
[ 1.387465] xilinx_ps2 81480000.ps2: Device Tree Probing 'ps2'
[ 1.456732] xilinx_ps2 81480000.ps2: Xilinx PS2 at 0x81480000 mapped to 0xd1036000, irq=22
[ 1.556112] xilinx_ps2 81481000.ps2: Device Tree Probing 'ps2'
[ 1.625786] xilinx_ps2 81481000.ps2: Xilinx PS2 at 0x81481000 mapped to 0xd1038000, irq=23
[ 1.726276] mousedev: PS/2 mouse device common for all mice
[ 1.793618] i2c /dev entries driver
[ 1.835429] Device Tree Probing 'i2c'
[ 1.879626] xilinx-iic #0 at 0x81600000 mapped to 0xD10C0000, irq=18
[ 1.957193] TCP cubic registered
[ 1.995099] NET: Registered protocol family 17
[ 2.790435] atkbd serio0: keyboard reset failed on xilinxps2/serio at 81480000
[ 3.274705] RAMDISK: gzip image found at block 0
[ 3.681850] atkbd serio1: Frame/parity error: 02
[ 3.858630] input: AT Raw Set 2 keyboard as /devices/plb.0/xps-ps2.1/81481000.ps2/serio1/input/input0
[ 4.242871] VFS: Mounted root (ext2 filesystem) on device 1:0.
[ 4.313049] Freeing unused kernel memory: 152k freed

What should I do now to debug this issue further?

I have disabled image-prelink by not including it in my local.conf as follows:

# Remove image-prelink for PowerPC 32-bit and 64-bit targets.
USER_CLASSES ?= "buildstats image-mklibs"

Any thoughts on what I can try to do next, to narrow down the issue, with bash working statically, but not when linked with shared libraries?

OK couple of things. You could boot into static bash thats good, keep it that way and bundle some dynamically linked programs into the root file system

may be just a hello world which is dynamically linked. I would also compile a static version of gdb and strace but that could be next steps.

then boot into this static shell and try to run the dynamically linked hello world. Does that work ?

if not we have a dynamic linking issue.

Then you can go a step deeper and see whats going on. Many a times interpreter is specified wrongly in the elf file.

and there could be dynamic linker issues too. But step at a time.

Best regards,

Elvis Dowson

_______________________________________________
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Elvis Dowson

#8405

Hi,

On Aug 4, 2012, at 6:24 AM, Khem Raj wrote:

OK couple of things. You could boot into static bash thats good, keep it that way and bundle some dynamically linked programs into the root file system
may be just a hello world which is dynamically linked. I would also compile a static version of gdb and strace but that could be next steps.

then boot into this static shell and try to run the dynamically linked hello world. Does that work ?
if not we have a dynamic linking issue.

Then you can go a step deeper and see whats going on. Many a times interpreter is specified wrongly in the elf file.
and there could be dynamic linker issues too. But step at a time.

I created a new 16GB ramdisk file, and put the core-image-minimal root filesystem into it. I then created a static version and a dynamic version of the helloworld program.

I find that the static version of the helloworld loads okay, but the dynamic version of the helloworld program doesn't give any output.

I guess this means we have a dynamic linking issue.

I've attached the outputs of the readelf -h and -S commands, and the outputs of the objdump commands for the text and data sections for the helloworlddynamic program.

zImage starting: loaded at 0x00800000 (sp: 0x00f37fb0)

Allocating 0x540e0c bytes for kernel ...

gunzipping (0x00000000 <- 0x0080f000:0x00a17de4)...done 0x4235c0 bytes

Attached initrd image at 0x00a18000-0x00f36f10

initrd head: 0x1f8b0808

Linux/PowerPC load: console=ttyS0,9600n8 ip=off root=/dev/ram rw rootwait init=/helloworlddynamic

Finalizing device tree... flat tree at 0xf440e0

PM: Adding info for No Bus:ttyv9

[ 0.492863] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled

[ 0.498167] 83e00000.serial: ttyS0 at MMIO 0x83e01003 (irq = 20) is a 16550

[ 0.693672] console [ttyS0] enabled

[ 0.757577] brd: module loaded

[ 0.804366] loop: module loaded

[ 0.841663] xsysace 83600000.sysace: Xilinx SystemACE revision 1.0.12

[ 0.918399] xsysace 83600000.sysace: No CF in slot

[ 0.977368] Xilinx SystemACE device driver, major=254

[ 1.038331] xilinx_emaclite 81000000.ethernet: Device Tree Probing

[ 1.111862] xilinx_emaclite 81000000.ethernet: error registering MDIO bus

[ 1.192936] xilinx_emaclite 81000000.ethernet: MAC address is now 00:0a:35:b7:78:00

[ 1.286646] xilinx_emaclite 81000000.ethernet: Xilinx EmacLite at 0x81000000 mapped to 0xD10A0000, irq=17

[ 1.401504] xilinx_ps2 81480000.ps2: Device Tree Probing 'ps2'

[ 1.470737] xilinx_ps2 81480000.ps2: Xilinx PS2 at 0x81480000 mapped to 0xd1036000, irq=22

[ 1.570108] xilinx_ps2 81481000.ps2: Device Tree Probing 'ps2'

[ 1.639794] xilinx_ps2 81481000.ps2: Xilinx PS2 at 0x81481000 mapped to 0xd1038000, irq=23

[ 1.740312] mousedev: PS/2 mouse device common for all mice

[ 1.807658] i2c /dev entries driver

[ 1.849416] Device Tree Probing 'i2c'

[ 1.893623] xilinx-iic #0 at 0x81600000 mapped to 0xD10C0000, irq=18

[ 1.971280] TCP cubic registered

[ 2.009127] NET: Registered protocol family 17

[ 2.806385] atkbd serio0: keyboard reset failed on xilinxps2/serio at 81480000

[ 3.290656] RAMDISK: gzip image found at block 0

[ 3.818580] input: AT Raw Set 2 keyboard as /devices/plb.0/xps-ps2.1/81481000.ps2/serio1/input/input0

[ 4.750816] VFS: Mounted root (ext2 filesystem) on device 1:0.

[ 4.820805] Freeing unused kernel memory: 152k freed

Here is the output of the readelf -h and -S commands:

${CROSS_COMPILE}readelf -h helloworlddynamic

ELF Header:

Magic: 7f 45 4c 46 01 02 01 00 00 00 00 00 00 00 00 00

Class: ELF32

Data: 2's complement, big endian

Version: 1 (current)

OS/ABI: UNIX - System V

ABI Version: 0

Type: EXEC (Executable file)

Machine: PowerPC

Version: 0x1

Entry point address: 0x1000032c

Start of program headers: 52 (bytes into file)

Start of section headers: 4216 (bytes into file)

Flags: 0x0

Size of this header: 52 (bytes)

Size of program headers: 32 (bytes)

Number of program headers: 8

Size of section headers: 40 (bytes)

Number of section headers: 36

Section header string table index: 33

${CROSS_COMPILE}readelf -S helloworlddynamic

There are 36 section headers, starting at offset 0x1078:

Section Headers:

[Nr] Name Type Addr Off Size ES Flg Lk Inf Al

[ 0] NULL 00000000 000000 000000 00 0 0 0

[ 1] .interp PROGBITS 10000134 000134 00000d 00 A 0 0 1

[ 2] .note.ABI-tag NOTE 10000144 000144 000020 00 A 0 0 4

[ 3] .gnu.hash GNU_HASH 10000164 000164 000020 04 A 4 0 4

[ 4] .dynsym DYNSYM 10000184 000184 000070 10 A 5 1 4

[ 5] .dynstr STRTAB 100001f4 0001f4 000064 00 A 0 0 1

[ 6] .gnu.version VERSYM 10000258 000258 00000e 02 A 4 0 2

[ 7] .gnu.version_r VERNEED 10000268 000268 000030 00 A 5 1 4

[ 8] .rela.dyn RELA 10000298 000298 00000c 0c A 4 0 4

[ 9] .rela.plt RELA 100002a4 0002a4 00003c 0c A 4 23 4

[10] .init PROGBITS 100002e0 0002e0 00004c 00 AX 0 0 4

[11] .text PROGBITS 1000032c 00032c 000348 00 AX 0 0 4

[12] .fini PROGBITS 10000674 000674 000030 00 AX 0 0 4

[13] .rodata PROGBITS 100006a4 0006a4 000039 00 A 0 0 4

[14] .eh_frame_hdr PROGBITS 100006e0 0006e0 000014 00 A 0 0 4

[15] .eh_frame PROGBITS 100006f4 0006f4 00002c 00 A 0 0 4

[16] .ctors PROGBITS 10010720 000720 000008 00 WA 0 0 4

[17] .dtors PROGBITS 10010728 000728 000008 00 WA 0 0 4

[18] .jcr PROGBITS 10010730 000730 000004 00 WA 0 0 4

[19] .got2 PROGBITS 10010734 000734 000008 00 WA 0 0 1

[20] .dynamic DYNAMIC 1001073c 00073c 0000c8 08 WA 5 0 4

[21] .data PROGBITS 10010804 000804 000008 00 WA 0 0 4

[22] .got PROGBITS 1001080c 00080c 000014 04 WAX 0 0 4

[23] .plt NOBITS 10010820 000820 000084 00 WAX 0 0 4

[24] .bss NOBITS 100108a4 000820 000008 00 WA 0 0 4

[25] .comment PROGBITS 00000000 000820 000027 01 MS 0 0 1

[26] .debug_aranges PROGBITS 00000000 000847 000038 00 0 0 1

[27] .debug_info PROGBITS 00000000 00087f 0001d6 00 0 0 1

[28] .debug_abbrev PROGBITS 00000000 000a55 00014d 00 0 0 1

[29] .debug_line PROGBITS 00000000 000ba2 000113 00 0 0 1

[30] .debug_frame PROGBITS 00000000 000cb8 00005c 00 0 0 4

[31] .debug_str PROGBITS 00000000 000d14 000154 01 MS 0 0 1

[32] .debug_loc PROGBITS 00000000 000e68 0000cf 00 0 0 1

[33] .shstrtab STRTAB 00000000 000f37 000140 00 0 0 1

[34] .symtab SYMTAB 00000000 001618 000520 10 35 58 4

[35] .strtab STRTAB 00000000 001b38 0002d6 00 0 0 1

Key to Flags:

W (write), A (alloc), X (execute), M (merge), S (strings)

I (info), L (link order), G (group), T (TLS), E (exclude), x (unknown)

O (extra OS processing required) o (OS specific), p (processor specific)

Here is the output of the objdump command:

${CROSS_COMPILE}objdump -d -j .text helloworlddynamic

helloworlddynamic: file format elf32-powerpc

Disassembly of section .text:

1000032c <_start>:

1000032c: 7c 29 0b 78 mr r9,r1

10000330: 54 21 00 36 rlwinm r1,r1,0,0,27

10000334: 38 00 00 00 li r0,0

10000338: 94 21 ff f0 stwu r1,-16(r1)

1000033c: 7c 08 03 a6 mtlr r0

10000340: 90 01 00 00 stw r0,0(r1)

10000344: 3d 00 10 00 lis r8,4096

10000348: 85 a8 06 a4 lwzu r13,1700(r8)

1000034c: 48 01 05 34 b 10010880 <__libc_start_main@plt>

10000350 <deregister_tm_clones>:

10000350: 3d 20 10 01 lis r9,4097

10000354: 3c 60 10 01 lis r3,4097

10000358: 39 29 08 0c addi r9,r9,2060

1000035c: 38 63 08 0c addi r3,r3,2060

10000360: 39 29 00 03 addi r9,r9,3

10000364: 7d 23 48 50 subf r9,r3,r9

10000368: 2b 89 00 06 cmplwi cr7,r9,6

1000036c: 4c bd 00 20 blelr+ cr7

10000370: 3d 20 00 00 lis r9,0

10000374: 39 29 00 00 addi r9,r9,0

10000378: 2f 89 00 00 cmpwi cr7,r9,0

1000037c: 4d 9e 00 20 beqlr cr7

10000380: 7d 29 03 a6 mtctr r9

10000384: 4e 80 04 20 bctr

10000388 <register_tm_clones>:

10000388: 3c 60 10 01 lis r3,4097

1000038c: 3d 20 10 01 lis r9,4097

10000390: 38 63 08 0c addi r3,r3,2060

10000394: 39 29 08 0c addi r9,r9,2060

10000398: 7d 23 48 50 subf r9,r3,r9

1000039c: 7d 29 16 70 srawi r9,r9,2

100003a0: 7d 24 0e 70 srawi r4,r9,1

100003a4: 7c 84 01 95 addze. r4,r4

100003a8: 4d a2 00 20 beqlr+

100003ac: 3d 20 00 00 lis r9,0

100003b0: 39 29 00 00 addi r9,r9,0

100003b4: 2f 89 00 00 cmpwi cr7,r9,0

100003b8: 4d 9e 00 20 beqlr cr7

100003bc: 7d 29 03 a6 mtctr r9

100003c0: 4e 80 04 20 bctr

100003c4 <__do_global_dtors_aux>:

100003c4: 94 21 ff e0 stwu r1,-32(r1)

100003c8: 7c 08 02 a6 mflr r0

100003cc: 93 81 00 10 stw r28,16(r1)

100003d0: 3f 80 10 01 lis r28,4097

100003d4: 89 3c 08 a4 lbz r9,2212(r28)

100003d8: 90 01 00 24 stw r0,36(r1)

100003dc: 93 a1 00 14 stw r29,20(r1)

100003e0: 2f 89 00 00 cmpwi cr7,r9,0

100003e4: 93 c1 00 18 stw r30,24(r1)

100003e8: 93 e1 00 1c stw r31,28(r1)

100003ec: 40 9e 00 64 bne- cr7,10000450 <__do_global_dtors_aux+0x8c>

100003f0: 3f a0 10 01 lis r29,4097

100003f4: 3f c0 10 01 lis r30,4097

100003f8: 3f e0 10 01 lis r31,4097

100003fc: 3b bd 07 28 addi r29,r29,1832

10000400: 3b de 07 2c addi r30,r30,1836

10000404: 81 3f 08 a8 lwz r9,2216(r31)

10000408: 7f dd f0 50 subf r30,r29,r30

1000040c: 3b ff 08 a8 addi r31,r31,2216

10000410: 7f de 16 70 srawi r30,r30,2

10000414: 3b de ff ff addi r30,r30,-1

10000418: 7f 89 f0 40 cmplw cr7,r9,r30

1000041c: 40 9c 00 28 bge- cr7,10000444 <__do_global_dtors_aux+0x80>

10000420: 39 29 00 01 addi r9,r9,1

10000424: 55 2a 10 3a rlwinm r10,r9,2,0,29

10000428: 91 3f 00 00 stw r9,0(r31)

1000042c: 7d 3d 50 2e lwzx r9,r29,r10

10000430: 7d 29 03 a6 mtctr r9

10000434: 4e 80 04 21 bctrl

10000438: 81 3f 00 00 lwz r9,0(r31)

1000043c: 7f 89 f0 40 cmplw cr7,r9,r30

10000440: 41 9c ff e0 blt+ cr7,10000420 <__do_global_dtors_aux+0x5c>

10000444: 4b ff ff 0d bl 10000350 <deregister_tm_clones>

10000448: 39 20 00 01 li r9,1

1000044c: 99 3c 08 a4 stb r9,2212(r28)

10000450: 80 01 00 24 lwz r0,36(r1)

10000454: 83 81 00 10 lwz r28,16(r1)

10000458: 83 a1 00 14 lwz r29,20(r1)

1000045c: 7c 08 03 a6 mtlr r0

10000460: 83 c1 00 18 lwz r30,24(r1)

10000464: 83 e1 00 1c lwz r31,28(r1)

10000468: 38 21 00 20 addi r1,r1,32

1000046c: 4e 80 00 20 blr

10000470 <call___do_global_dtors_aux>:

10000470: 94 21 ff f0 stwu r1,-16(r1)

10000474: 7c 08 02 a6 mflr r0

10000478: 90 01 00 14 stw r0,20(r1)

1000047c: 80 01 00 14 lwz r0,20(r1)

10000480: 38 21 00 10 addi r1,r1,16

10000484: 7c 08 03 a6 mtlr r0

10000488: 4e 80 00 20 blr

1000048c <frame_dummy>:

1000048c: 3c 60 10 01 lis r3,4097

10000490: 81 23 07 30 lwz r9,1840(r3)

10000494: 38 63 07 30 addi r3,r3,1840

10000498: 2f 89 00 00 cmpwi cr7,r9,0

1000049c: 41 9e 00 38 beq- cr7,100004d4 <frame_dummy+0x48>

100004a0: 3d 20 00 00 lis r9,0

100004a4: 39 29 00 00 addi r9,r9,0

100004a8: 2f 89 00 00 cmpwi cr7,r9,0

100004ac: 41 9e 00 28 beq- cr7,100004d4 <frame_dummy+0x48>

100004b0: 94 21 ff f0 stwu r1,-16(r1)

100004b4: 7c 08 02 a6 mflr r0

100004b8: 7d 29 03 a6 mtctr r9

100004bc: 90 01 00 14 stw r0,20(r1)

100004c0: 4e 80 04 21 bctrl

100004c4: 80 01 00 14 lwz r0,20(r1)

100004c8: 38 21 00 10 addi r1,r1,16

100004cc: 7c 08 03 a6 mtlr r0

100004d0: 4b ff fe b8 b 10000388 <register_tm_clones>

100004d4: 4b ff fe b4 b 10000388 <register_tm_clones>

100004d8 <call_frame_dummy>:

100004d8: 94 21 ff f0 stwu r1,-16(r1)

100004dc: 7c 08 02 a6 mflr r0

100004e0: 90 01 00 14 stw r0,20(r1)

100004e4: 80 01 00 14 lwz r0,20(r1)

100004e8: 38 21 00 10 addi r1,r1,16

100004ec: 7c 08 03 a6 mtlr r0

100004f0: 4e 80 00 20 blr

100004f4 <main>:

100004f4: 94 21 ff f0 stwu r1,-16(r1)

100004f8: 7c 08 02 a6 mflr r0

100004fc: 90 01 00 14 stw r0,20(r1)

10000500: 93 e1 00 0c stw r31,12(r1)

10000504: 7c 3f 0b 78 mr r31,r1

10000508: 38 60 00 0a li r3,10

1000050c: 48 01 03 7d bl 10010888 <putchar@plt>

10000510: 3d 20 10 00 lis r9,4096

10000514: 38 69 06 b8 addi r3,r9,1720

10000518: 3d 20 10 00 lis r9,4096

1000051c: 38 89 06 d0 addi r4,r9,1744

10000520: 48 01 03 49 bl 10010868 <printf@plt>

10000524: 3d 20 3b 9a lis r9,15258

10000528: 61 23 c9 ff ori r3,r9,51711

1000052c: 48 01 03 45 bl 10010870 <sleep@plt>

10000530: 39 20 00 00 li r9,0

10000534: 7d 23 4b 78 mr r3,r9

10000538: 39 7f 00 10 addi r11,r31,16

1000053c: 80 0b 00 04 lwz r0,4(r11)

10000540: 7c 08 03 a6 mtlr r0

10000544: 83 eb ff fc lwz r31,-4(r11)

10000548: 7d 61 5b 78 mr r1,r11

1000054c: 4e 80 00 20 blr

10000550: 00 01 81 d4 .long 0x181d4

10000554 <__libc_csu_init>:

10000554: 94 21 ff d0 stwu r1,-48(r1)

10000558: 7c 08 02 a6 mflr r0

1000055c: 42 9f 00 05 bcl- 20,4*cr7+so,10000560 <__libc_csu_init+0xc>

10000560: 93 c1 00 28 stw r30,40(r1)

10000564: 7f c8 02 a6 mflr r30

10000568: 90 01 00 34 stw r0,52(r1)

1000056c: 80 1e ff f0 lwz r0,-16(r30)

10000570: 93 21 00 14 stw r25,20(r1)

10000574: 7c 79 1b 78 mr r25,r3

10000578: 93 41 00 18 stw r26,24(r1)

1000057c: 7c 9a 23 78 mr r26,r4

10000580: 7f c0 f2 14 add r30,r0,r30

10000584: 93 61 00 1c stw r27,28(r1)

10000588: 93 81 00 20 stw r28,32(r1)

1000058c: 7c bb 2b 78 mr r27,r5

10000590: 93 a1 00 24 stw r29,36(r1)

10000594: 93 e1 00 2c stw r31,44(r1)

10000598: 4b ff fd 49 bl 100002e0 <_init>

1000059c: 81 3e 80 04 lwz r9,-32764(r30)

100005a0: 3b e0 00 00 li r31,0

100005a4: 83 9e 80 00 lwz r28,-32768(r30)

100005a8: 3b a9 ff fc addi r29,r9,-4

100005ac: 7f 89 e0 50 subf r28,r9,r28

100005b0: 7f 9c 16 71 srawi. r28,r28,2

100005b4: 41 82 00 28 beq- 100005dc <__libc_csu_init+0x88>

100005b8: 85 3d 00 04 lwzu r9,4(r29)

100005bc: 7f 23 cb 78 mr r3,r25

100005c0: 7f 44 d3 78 mr r4,r26

100005c4: 7f 65 db 78 mr r5,r27

100005c8: 3b ff 00 01 addi r31,r31,1

100005cc: 7d 29 03 a6 mtctr r9

100005d0: 4e 80 04 21 bctrl

100005d4: 7f 9f e0 00 cmpw cr7,r31,r28

100005d8: 40 9e ff e0 bne+ cr7,100005b8 <__libc_csu_init+0x64>

100005dc: 80 01 00 34 lwz r0,52(r1)

100005e0: 83 21 00 14 lwz r25,20(r1)

100005e4: 83 41 00 18 lwz r26,24(r1)

100005e8: 7c 08 03 a6 mtlr r0

100005ec: 83 61 00 1c lwz r27,28(r1)

100005f0: 83 81 00 20 lwz r28,32(r1)

100005f4: 83 a1 00 24 lwz r29,36(r1)

100005f8: 83 c1 00 28 lwz r30,40(r1)

100005fc: 83 e1 00 2c lwz r31,44(r1)

10000600: 38 21 00 30 addi r1,r1,48

10000604: 4e 80 00 20 blr

10000608 <__libc_csu_fini>:

10000608: 4e 80 00 20 blr

1000060c <__do_global_ctors_aux>:

1000060c: 94 21 ff f0 stwu r1,-16(r1)

10000610: 7c 08 02 a6 mflr r0

10000614: 90 01 00 14 stw r0,20(r1)

10000618: 93 e1 00 0c stw r31,12(r1)

1000061c: 3f e0 10 01 lis r31,4097

10000620: 3b ff 07 24 addi r31,r31,1828

10000624: 85 3f ff fc lwzu r9,-4(r31)

10000628: 2f 89 ff ff cmpwi cr7,r9,-1

1000062c: 41 9e 00 18 beq- cr7,10000644 <__do_global_ctors_aux+0x38>

10000630: 7d 29 03 a6 mtctr r9

10000634: 4e 80 04 21 bctrl

10000638: 85 3f ff fc lwzu r9,-4(r31)

1000063c: 2f 89 ff ff cmpwi cr7,r9,-1

10000640: 40 9e ff f0 bne+ cr7,10000630 <__do_global_ctors_aux+0x24>

10000644: 80 01 00 14 lwz r0,20(r1)

10000648: 83 e1 00 0c lwz r31,12(r1)

1000064c: 38 21 00 10 addi r1,r1,16

10000650: 7c 08 03 a6 mtlr r0

10000654: 4e 80 00 20 blr

10000658 <call___do_global_ctors_aux>:

10000658: 94 21 ff f0 stwu r1,-16(r1)

1000065c: 7c 08 02 a6 mflr r0

10000660: 90 01 00 14 stw r0,20(r1)

10000664: 80 01 00 14 lwz r0,20(r1)

10000668: 38 21 00 10 addi r1,r1,16

1000066c: 7c 08 03 a6 mtlr r0

10000670: 4e 80 00 20 blr

${CROSS_COMPILE}objdump -d -j .data helloworlddynamic

helloworlddynamic: file format elf32-powerpc

Disassembly of section .data:

10010804 <__data_start>:

10010804: 00 00 00 00 .long 0x0

10010808 <__dso_handle>:

10010808: 00 00 00 00 ....

I'm not sure what to infer with all this data, what should I be looking at or checking, to try to find out what's going wrong with dynamic linked programs built with gcc-4.7.2 for PowerPC440 ?

Best regards,

Elvis Dowson

#8406

Hi,

On Aug 4, 2012, at 5:56 PM, Elvis Dowson wrote:

On Aug 4, 2012, at 6:24 AM, Khem Raj wrote:

OK couple of things. You could boot into static bash thats good, keep it that way and bundle some dynamically linked programs into the root file system
may be just a hello world which is dynamically linked. I would also compile a static version of gdb and strace but that could be next steps.

then boot into this static shell and try to run the dynamically linked hello world. Does that work ?
if not we have a dynamic linking issue.

Then you can go a step deeper and see whats going on. Many a times interpreter is specified wrongly in the elf file.
and there could be dynamic linker issues too. But step at a time.

I created a new 16GB ramdisk file, and put the core-image-minimal root filesystem into it. I then created a static version and a dynamic version of the helloworld program.

I find that the static version of the helloworld loads okay, but the dynamic version of the helloworld program doesn't give any output.

I guess this means we have a dynamic linking issue.

In the objdump I see two version references for glibc, is that normal?

Version References:

required from libc.so.6:

0x0d696910 0x00 03 GLIBC_2.0

0x0d696914 0x00 02 GLIBC_2.4

Here is the full output of the readelf -a helloworlddynamic executable:

${CROSS_COMPILE}readelf -a helloworlddynamic

ELF Header:

Magic: 7f 45 4c 46 01 02 01 00 00 00 00 00 00 00 00 00

Class: ELF32

Data: 2's complement, big endian

Version: 1 (current)

OS/ABI: UNIX - System V

ABI Version: 0

Type: EXEC (Executable file)

Machine: PowerPC

Version: 0x1

Entry point address: 0x1000032c

Start of program headers: 52 (bytes into file)

Start of section headers: 4216 (bytes into file)

Flags: 0x0

Size of this header: 52 (bytes)

Size of program headers: 32 (bytes)

Number of program headers: 8

Size of section headers: 40 (bytes)

Number of section headers: 36

Section header string table index: 33

Section Headers:

[Nr] Name Type Addr Off Size ES Flg Lk Inf Al

[ 0] NULL 00000000 000000 000000 00 0 0 0

[ 1] .interp PROGBITS 10000134 000134 00000d 00 A 0 0 1

[ 2] .note.ABI-tag NOTE 10000144 000144 000020 00 A 0 0 4

[ 3] .gnu.hash GNU_HASH 10000164 000164 000020 04 A 4 0 4

[ 4] .dynsym DYNSYM 10000184 000184 000070 10 A 5 1 4

[ 5] .dynstr STRTAB 100001f4 0001f4 000064 00 A 0 0 1

[ 6] .gnu.version VERSYM 10000258 000258 00000e 02 A 4 0 2

[ 7] .gnu.version_r VERNEED 10000268 000268 000030 00 A 5 1 4

[ 8] .rela.dyn RELA 10000298 000298 00000c 0c A 4 0 4

[ 9] .rela.plt RELA 100002a4 0002a4 00003c 0c A 4 23 4

[10] .init PROGBITS 100002e0 0002e0 00004c 00 AX 0 0 4

[11] .text PROGBITS 1000032c 00032c 000348 00 AX 0 0 4

[12] .fini PROGBITS 10000674 000674 000030 00 AX 0 0 4

[13] .rodata PROGBITS 100006a4 0006a4 000039 00 A 0 0 4

[14] .eh_frame_hdr PROGBITS 100006e0 0006e0 000014 00 A 0 0 4

[15] .eh_frame PROGBITS 100006f4 0006f4 00002c 00 A 0 0 4

[16] .ctors PROGBITS 10010720 000720 000008 00 WA 0 0 4

[17] .dtors PROGBITS 10010728 000728 000008 00 WA 0 0 4

[18] .jcr PROGBITS 10010730 000730 000004 00 WA 0 0 4

[19] .got2 PROGBITS 10010734 000734 000008 00 WA 0 0 1

[20] .dynamic DYNAMIC 1001073c 00073c 0000c8 08 WA 5 0 4

[21] .data PROGBITS 10010804 000804 000008 00 WA 0 0 4

[22] .got PROGBITS 1001080c 00080c 000014 04 WAX 0 0 4

[23] .plt NOBITS 10010820 000820 000084 00 WAX 0 0 4

[24] .bss NOBITS 100108a4 000820 000008 00 WA 0 0 4

[25] .comment PROGBITS 00000000 000820 000027 01 MS 0 0 1

[26] .debug_aranges PROGBITS 00000000 000847 000038 00 0 0 1

[27] .debug_info PROGBITS 00000000 00087f 0001d6 00 0 0 1

[28] .debug_abbrev PROGBITS 00000000 000a55 00014d 00 0 0 1

[29] .debug_line PROGBITS 00000000 000ba2 000113 00 0 0 1

[30] .debug_frame PROGBITS 00000000 000cb8 00005c 00 0 0 4

[31] .debug_str PROGBITS 00000000 000d14 000154 01 MS 0 0 1

[32] .debug_loc PROGBITS 00000000 000e68 0000cf 00 0 0 1

[33] .shstrtab STRTAB 00000000 000f37 000140 00 0 0 1

[34] .symtab SYMTAB 00000000 001618 000520 10 35 58 4

[35] .strtab STRTAB 00000000 001b38 0002d6 00 0 0 1

Key to Flags:

W (write), A (alloc), X (execute), M (merge), S (strings)

I (info), L (link order), G (group), T (TLS), E (exclude), x (unknown)

O (extra OS processing required) o (OS specific), p (processor specific)

There are no section groups in this file.

Program Headers:

Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align

PHDR 0x000034 0x10000034 0x10000034 0x00100 0x00100 R E 0x4

INTERP 0x000134 0x10000134 0x10000134 0x0000d 0x0000d R 0x1

[Requesting program interpreter: /lib/ld.so.1]

LOAD 0x000000 0x10000000 0x10000000 0x00720 0x00720 R E 0x10000

LOAD 0x000720 0x10010720 0x10010720 0x00100 0x0018c RWE 0x10000

DYNAMIC 0x00073c 0x1001073c 0x1001073c 0x000c8 0x000c8 RW 0x4

NOTE 0x000144 0x10000144 0x10000144 0x00020 0x00020 R 0x4

GNU_EH_FRAME 0x0006e0 0x100006e0 0x100006e0 0x00014 0x00014 R 0x4

GNU_STACK 0x000000 0x00000000 0x00000000 0x00000 0x00000 RW 0x4

Section to Segment mapping:

Segment Sections...

00

01 .interp

02 .interp .note.ABI-tag .gnu.hash .dynsym .dynstr .gnu.version .gnu.version_r .rela.dyn .rela.plt .init .text .fini .rodata .eh_frame_hdr .eh_frame

03 .ctors .dtors .jcr .got2 .dynamic .data .got .plt .bss

04 .dynamic

05 .note.ABI-tag

06 .eh_frame_hdr

07

Dynamic section at offset 0x73c contains 20 entries:

Tag Type Name/Value

0x00000001 (NEEDED) Shared library: [libc.so.6]

0x0000000c (INIT) 0x100002e0

0x0000000d (FINI) 0x10000674

0x6ffffef5 (GNU_HASH) 0x10000164

0x00000005 (STRTAB) 0x100001f4

0x00000006 (SYMTAB) 0x10000184

0x0000000a (STRSZ) 100 (bytes)

0x0000000b (SYMENT) 16 (bytes)

0x00000015 (DEBUG) 0x0

0x00000003 (PLTGOT) 0x10010820

0x00000002 (PLTRELSZ) 60 (bytes)

0x00000014 (PLTREL) RELA

0x00000017 (JMPREL) 0x100002a4

0x00000007 (RELA) 0x10000298

0x00000008 (RELASZ) 72 (bytes)

0x00000009 (RELAENT) 12 (bytes)

0x6ffffffe (VERNEED) 0x10000268

0x6fffffff (VERNEEDNUM) 1

0x6ffffff0 (VERSYM) 0x10000258

0x00000000 (NULL) 0x0

Relocation section '.rela.dyn' at offset 0x298 contains 1 entries:

Offset Info Type Sym.Value Sym. Name + Addend

1001080c 00000314 R_PPC_GLOB_DAT 00000000 __gmon_start__ + 0

Relocation section '.rela.plt' at offset 0x2a4 contains 5 entries:

Offset Info Type Sym.Value Sym. Name + Addend

10010868 00000115 R_PPC_JMP_SLOT 00000000 printf + 0

10010870 00000215 R_PPC_JMP_SLOT 00000000 sleep + 0

10010878 00000315 R_PPC_JMP_SLOT 00000000 __gmon_start__ + 0

10010880 00000415 R_PPC_JMP_SLOT 00000000 __libc_start_main + 0

10010888 00000515 R_PPC_JMP_SLOT 00000000 putchar + 0

There are no unwind sections in this file.

Symbol table '.dynsym' contains 7 entries:

Num: Value Size Type Bind Vis Ndx Name

0: 00000000 0 NOTYPE LOCAL DEFAULT UND

1: 00000000 0 FUNC GLOBAL DEFAULT UND printf@... (2)

2: 00000000 0 FUNC GLOBAL DEFAULT UND sleep@... (3)

3: 00000000 0 NOTYPE WEAK DEFAULT UND __gmon_start__

4: 00000000 0 FUNC GLOBAL DEFAULT UND __libc_start_main@... (3)

5: 00000000 0 FUNC GLOBAL DEFAULT UND putchar@... (3)

6: 100006b4 4 OBJECT GLOBAL DEFAULT 13 _IO_stdin_used

Symbol table '.symtab' contains 82 entries:

Num: Value Size Type Bind Vis Ndx Name

0: 00000000 0 NOTYPE LOCAL DEFAULT UND

1: 10000134 0 SECTION LOCAL DEFAULT 1

2: 10000144 0 SECTION LOCAL DEFAULT 2

3: 10000164 0 SECTION LOCAL DEFAULT 3

4: 10000184 0 SECTION LOCAL DEFAULT 4

5: 100001f4 0 SECTION LOCAL DEFAULT 5

6: 10000258 0 SECTION LOCAL DEFAULT 6

7: 10000268 0 SECTION LOCAL DEFAULT 7

8: 10000298 0 SECTION LOCAL DEFAULT 8

9: 100002a4 0 SECTION LOCAL DEFAULT 9

10: 100002e0 0 SECTION LOCAL DEFAULT 10

11: 1000032c 0 SECTION LOCAL DEFAULT 11

12: 10000674 0 SECTION LOCAL DEFAULT 12

13: 100006a4 0 SECTION LOCAL DEFAULT 13

14: 100006e0 0 SECTION LOCAL DEFAULT 14

15: 100006f4 0 SECTION LOCAL DEFAULT 15

16: 10010720 0 SECTION LOCAL DEFAULT 16

17: 10010728 0 SECTION LOCAL DEFAULT 17

18: 10010730 0 SECTION LOCAL DEFAULT 18

19: 10010734 0 SECTION LOCAL DEFAULT 19

20: 1001073c 0 SECTION LOCAL DEFAULT 20

21: 10010804 0 SECTION LOCAL DEFAULT 21

22: 1001080c 0 SECTION LOCAL DEFAULT 22

23: 10010820 0 SECTION LOCAL DEFAULT 23

24: 100108a4 0 SECTION LOCAL DEFAULT 24

25: 00000000 0 SECTION LOCAL DEFAULT 25

26: 00000000 0 SECTION LOCAL DEFAULT 26

27: 00000000 0 SECTION LOCAL DEFAULT 27

28: 00000000 0 SECTION LOCAL DEFAULT 28

29: 00000000 0 SECTION LOCAL DEFAULT 29

30: 00000000 0 SECTION LOCAL DEFAULT 30

31: 00000000 0 SECTION LOCAL DEFAULT 31

32: 00000000 0 SECTION LOCAL DEFAULT 32

33: 00000000 0 FILE LOCAL DEFAULT ABS init.c

34: 00000000 0 FILE LOCAL DEFAULT ABS crtstuff.c

35: 10010720 0 OBJECT LOCAL DEFAULT 16 __CTOR_LIST__

36: 10010728 0 OBJECT LOCAL DEFAULT 17 __DTOR_LIST__

37: 10010730 0 OBJECT LOCAL DEFAULT 18 __JCR_LIST__

38: 10000350 0 FUNC LOCAL DEFAULT 11 deregister_tm_clones

39: 10000388 0 FUNC LOCAL DEFAULT 11 register_tm_clones

40: 100003c4 0 FUNC LOCAL DEFAULT 11 __do_global_dtors_aux

41: 100108a4 1 OBJECT LOCAL DEFAULT 24 completed.6650

42: 100108a8 4 OBJECT LOCAL DEFAULT 24 dtor_idx.6652

43: 10000470 0 FUNC LOCAL DEFAULT 11 call___do_global_dtors_au

44: 1000048c 0 FUNC LOCAL DEFAULT 11 frame_dummy

45: 100004d8 0 FUNC LOCAL DEFAULT 11 call_frame_dummy

46: 00000000 0 FILE LOCAL DEFAULT ABS crtstuff.c

47: 10010724 0 OBJECT LOCAL DEFAULT 16 __CTOR_END__

48: 1000071c 0 OBJECT LOCAL DEFAULT 15 __FRAME_END__

49: 10010730 0 OBJECT LOCAL DEFAULT 18 __JCR_END__

50: 1000060c 0 FUNC LOCAL DEFAULT 11 __do_global_ctors_aux

51: 10000658 0 FUNC LOCAL DEFAULT 11 call___do_global_ctors_au

52: 00000000 0 FILE LOCAL DEFAULT ABS helloworld.c

53: 00000000 0 FILE LOCAL DEFAULT ABS elf-init.c

54: 10010720 0 NOTYPE LOCAL DEFAULT 16 __init_array_end

55: 1001073c 0 OBJECT LOCAL DEFAULT 20 _DYNAMIC

56: 10010720 0 NOTYPE LOCAL DEFAULT 16 __init_array_start

57: 10010814 0 OBJECT LOCAL DEFAULT 22 _GLOBAL_OFFSET_TABLE_

58: 10000608 4 FUNC GLOBAL DEFAULT 11 __libc_csu_fini

59: 00000000 0 NOTYPE WEAK DEFAULT UND _ITM_deregisterTMCloneTab

60: 10010804 0 NOTYPE WEAK DEFAULT 21 data_start

61: 00000000 0 FUNC GLOBAL DEFAULT UND printf@@GLIBC_2.4

62: 10010820 0 NOTYPE GLOBAL DEFAULT ABS _edata

63: 00000000 0 FUNC GLOBAL DEFAULT UND sleep@@GLIBC_2.0

64: 10000674 0 FUNC GLOBAL DEFAULT 12 _fini

65: 1001072c 0 OBJECT GLOBAL HIDDEN 17 __DTOR_END__

66: 10010804 0 NOTYPE GLOBAL DEFAULT 21 __data_start

67: 00000000 0 NOTYPE WEAK DEFAULT UND __gmon_start__

68: 10010808 0 OBJECT GLOBAL HIDDEN 21 __dso_handle

69: 100006b4 4 OBJECT GLOBAL DEFAULT 13 _IO_stdin_used

70: 00000000 0 FUNC GLOBAL DEFAULT UND __libc_start_main@@GLIBC_

71: 10000554 180 FUNC GLOBAL DEFAULT 11 __libc_csu_init

72: 10018820 0 NOTYPE GLOBAL DEFAULT 22 _SDA_BASE_

73: 00000000 0 FUNC GLOBAL DEFAULT UND putchar@@GLIBC_2.0

74: 100108ac 0 NOTYPE GLOBAL DEFAULT ABS _end

75: 1000032c 36 FUNC GLOBAL DEFAULT 11 _start

76: 10010820 0 NOTYPE GLOBAL DEFAULT ABS __bss_start

77: 100004f4 92 FUNC GLOBAL DEFAULT 11 main

78: 00000000 0 NOTYPE WEAK DEFAULT UND _Jv_RegisterClasses

79: 1001080c 0 OBJECT GLOBAL HIDDEN 21 __TMC_END__

80: 00000000 0 NOTYPE WEAK DEFAULT UND _ITM_registerTMCloneTable

81: 100002e0 0 FUNC GLOBAL DEFAULT 10 _init

Histogram for `.gnu.hash' bucket list length (total of 2 buckets):

Length Number % of total Coverage

0 1 ( 50.0%)

1 1 ( 50.0%) 100.0%

Version symbols section '.gnu.version' contains 7 entries:

Addr: 0000000010000258 Offset: 0x000258 Link: 4 (.dynsym)

000: 0 (*local*) 2 (GLIBC_2.4) 3 (GLIBC_2.0) 0 (*local*)

004: 3 (GLIBC_2.0) 3 (GLIBC_2.0) 1 (*global*)

Version needs section '.gnu.version_r' contains 1 entries:

Addr: 0x0000000010000268 Offset: 0x000268 Link: 5 (.dynstr)

000000: Version: 1 File: libc.so.6 Cnt: 2

0x0010: Name: GLIBC_2.0 Flags: none Version: 3

0x0020: Name: GLIBC_2.4 Flags: none Version: 2

Notes at offset 0x00000144 with length 0x00000020:

Owner Data size Description

GNU 0x00000010 NT_GNU_ABI_TAG (ABI version tag)

OS: Linux, ABI: 2.6.16

Here is the output of the objdump -x command:

${CROSS_COMPILE}objdump -x helloworlddynamic

helloworlddynamic: file format elf32-powerpc

helloworlddynamic

architecture: powerpc:common, flags 0x00000112:

EXEC_P, HAS_SYMS, D_PAGED

start address 0x1000032c

Program Header:

PHDR off 0x00000034 vaddr 0x10000034 paddr 0x10000034 align 2**2

filesz 0x00000100 memsz 0x00000100 flags r-x

INTERP off 0x00000134 vaddr 0x10000134 paddr 0x10000134 align 2**0

filesz 0x0000000d memsz 0x0000000d flags r--

LOAD off 0x00000000 vaddr 0x10000000 paddr 0x10000000 align 2**16

filesz 0x00000720 memsz 0x00000720 flags r-x

LOAD off 0x00000720 vaddr 0x10010720 paddr 0x10010720 align 2**16

filesz 0x00000100 memsz 0x0000018c flags rwx

DYNAMIC off 0x0000073c vaddr 0x1001073c paddr 0x1001073c align 2**2

filesz 0x000000c8 memsz 0x000000c8 flags rw-

NOTE off 0x00000144 vaddr 0x10000144 paddr 0x10000144 align 2**2

filesz 0x00000020 memsz 0x00000020 flags r--

EH_FRAME off 0x000006e0 vaddr 0x100006e0 paddr 0x100006e0 align 2**2

filesz 0x00000014 memsz 0x00000014 flags r--

STACK off 0x00000000 vaddr 0x00000000 paddr 0x00000000 align 2**2

filesz 0x00000000 memsz 0x00000000 flags rw-

Dynamic Section:

NEEDED libc.so.6

INIT 0x100002e0

FINI 0x10000674

GNU_HASH 0x10000164

STRTAB 0x100001f4

SYMTAB 0x10000184

STRSZ 0x00000064

SYMENT 0x00000010

DEBUG 0x00000000

PLTGOT 0x10010820

PLTRELSZ 0x0000003c

PLTREL 0x00000007

JMPREL 0x100002a4

RELA 0x10000298

RELASZ 0x00000048

RELAENT 0x0000000c

VERNEED 0x10000268

VERNEEDNUM 0x00000001

VERSYM 0x10000258

Version References:

required from libc.so.6:

0x0d696910 0x00 03 GLIBC_2.0

0x0d696914 0x00 02 GLIBC_2.4

Sections:

Idx Name Size VMA LMA File off Algn

0 .interp 0000000d 10000134 10000134 00000134 2**0

CONTENTS, ALLOC, LOAD, READONLY, DATA

1 .note.ABI-tag 00000020 10000144 10000144 00000144 2**2

CONTENTS, ALLOC, LOAD, READONLY, DATA

2 .gnu.hash 00000020 10000164 10000164 00000164 2**2

CONTENTS, ALLOC, LOAD, READONLY, DATA

3 .dynsym 00000070 10000184 10000184 00000184 2**2

CONTENTS, ALLOC, LOAD, READONLY, DATA

4 .dynstr 00000064 100001f4 100001f4 000001f4 2**0

CONTENTS, ALLOC, LOAD, READONLY, DATA

5 .gnu.version 0000000e 10000258 10000258 00000258 2**1

CONTENTS, ALLOC, LOAD, READONLY, DATA

6 .gnu.version_r 00000030 10000268 10000268 00000268 2**2

CONTENTS, ALLOC, LOAD, READONLY, DATA

7 .rela.dyn 0000000c 10000298 10000298 00000298 2**2

CONTENTS, ALLOC, LOAD, READONLY, DATA

8 .rela.plt 0000003c 100002a4 100002a4 000002a4 2**2

CONTENTS, ALLOC, LOAD, READONLY, DATA

9 .init 0000004c 100002e0 100002e0 000002e0 2**2

CONTENTS, ALLOC, LOAD, READONLY, CODE

10 .text 00000348 1000032c 1000032c 0000032c 2**2

CONTENTS, ALLOC, LOAD, READONLY, CODE

11 .fini 00000030 10000674 10000674 00000674 2**2

CONTENTS, ALLOC, LOAD, READONLY, CODE

12 .rodata 00000039 100006a4 100006a4 000006a4 2**2

CONTENTS, ALLOC, LOAD, READONLY, DATA

13 .eh_frame_hdr 00000014 100006e0 100006e0 000006e0 2**2

CONTENTS, ALLOC, LOAD, READONLY, DATA

14 .eh_frame 0000002c 100006f4 100006f4 000006f4 2**2

CONTENTS, ALLOC, LOAD, READONLY, DATA

15 .ctors 00000008 10010720 10010720 00000720 2**2

CONTENTS, ALLOC, LOAD, DATA

16 .dtors 00000008 10010728 10010728 00000728 2**2

CONTENTS, ALLOC, LOAD, DATA

17 .jcr 00000004 10010730 10010730 00000730 2**2

CONTENTS, ALLOC, LOAD, DATA

18 .got2 00000008 10010734 10010734 00000734 2**0

CONTENTS, ALLOC, LOAD, DATA

19 .dynamic 000000c8 1001073c 1001073c 0000073c 2**2

CONTENTS, ALLOC, LOAD, DATA

20 .data 00000008 10010804 10010804 00000804 2**2

CONTENTS, ALLOC, LOAD, DATA

21 .got 00000014 1001080c 1001080c 0000080c 2**2

CONTENTS, ALLOC, LOAD, CODE

22 .plt 00000084 10010820 10010820 00000820 2**2

ALLOC, CODE

23 .bss 00000008 100108a4 100108a4 00000820 2**2

ALLOC

24 .comment 00000027 00000000 00000000 00000820 2**0

CONTENTS, READONLY

25 .debug_aranges 00000038 00000000 00000000 00000847 2**0

CONTENTS, READONLY, DEBUGGING

26 .debug_info 000001d6 00000000 00000000 0000087f 2**0

CONTENTS, READONLY, DEBUGGING

27 .debug_abbrev 0000014d 00000000 00000000 00000a55 2**0

CONTENTS, READONLY, DEBUGGING

28 .debug_line 00000113 00000000 00000000 00000ba2 2**0

CONTENTS, READONLY, DEBUGGING

29 .debug_frame 0000005c 00000000 00000000 00000cb8 2**2

CONTENTS, READONLY, DEBUGGING

30 .debug_str 00000154 00000000 00000000 00000d14 2**0

CONTENTS, READONLY, DEBUGGING

31 .debug_loc 000000cf 00000000 00000000 00000e68 2**0

CONTENTS, READONLY, DEBUGGING

SYMBOL TABLE:

10000134 l d .interp 00000000 .interp

10000144 l d .note.ABI-tag 00000000 .note.ABI-tag

10000164 l d .gnu.hash 00000000 .gnu.hash

10000184 l d .dynsym 00000000 .dynsym

100001f4 l d .dynstr 00000000 .dynstr

10000258 l d .gnu.version 00000000 .gnu.version

10000268 l d .gnu.version_r 00000000 .gnu.version_r

10000298 l d .rela.dyn 00000000 .rela.dyn

100002a4 l d .rela.plt 00000000 .rela.plt

100002e0 l d .init 00000000 .init

1000032c l d .text 00000000 .text

10000674 l d .fini 00000000 .fini

100006a4 l d .rodata 00000000 .rodata

100006e0 l d .eh_frame_hdr 00000000 .eh_frame_hdr

100006f4 l d .eh_frame 00000000 .eh_frame

10010720 l d .ctors 00000000 .ctors

10010728 l d .dtors 00000000 .dtors

10010730 l d .jcr 00000000 .jcr

10010734 l d .got2 00000000 .got2

1001073c l d .dynamic 00000000 .dynamic

10010804 l d .data 00000000 .data

1001080c l d .got 00000000 .got

10010820 l d .plt 00000000 .plt

100108a4 l d .bss 00000000 .bss

00000000 l d .comment 00000000 .comment

00000000 l d .debug_aranges 00000000 .debug_aranges

00000000 l d .debug_info 00000000 .debug_info

00000000 l d .debug_abbrev 00000000 .debug_abbrev

00000000 l d .debug_line 00000000 .debug_line

00000000 l d .debug_frame 00000000 .debug_frame

00000000 l d .debug_str 00000000 .debug_str

00000000 l d .debug_loc 00000000 .debug_loc

00000000 l df *ABS* 00000000 init.c

00000000 l df *ABS* 00000000 crtstuff.c

10010720 l O .ctors 00000000 __CTOR_LIST__

10010728 l O .dtors 00000000 __DTOR_LIST__

10010730 l O .jcr 00000000 __JCR_LIST__

10000350 l F .text 00000000 deregister_tm_clones

10000388 l F .text 00000000 register_tm_clones

100003c4 l F .text 00000000 __do_global_dtors_aux

100108a4 l O .bss 00000001 completed.6650

100108a8 l O .bss 00000004 dtor_idx.6652

10000470 l F .text 00000000 call___do_global_dtors_aux

1000048c l F .text 00000000 frame_dummy

100004d8 l F .text 00000000 call_frame_dummy

00000000 l df *ABS* 00000000 crtstuff.c

10010724 l O .ctors 00000000 __CTOR_END__

1000071c l O .eh_frame 00000000 __FRAME_END__

10010730 l O .jcr 00000000 __JCR_END__

1000060c l F .text 00000000 __do_global_ctors_aux

10000658 l F .text 00000000 call___do_global_ctors_aux

00000000 l df *ABS* 00000000 helloworld.c

00000000 l df *ABS* 00000000 elf-init.c

10010720 l .ctors 00000000 __init_array_end

1001073c l O .dynamic 00000000 _DYNAMIC

10010720 l .ctors 00000000 __init_array_start

10010814 l O .got 00000000 _GLOBAL_OFFSET_TABLE_

10000608 g F .text 00000004 __libc_csu_fini

00000000 w *UND* 00000000 _ITM_deregisterTMCloneTable

10010804 w .data 00000000 data_start

00000000 F *UND* 00000000 printf@@GLIBC_2.4

10010820 g *ABS* 00000000 _edata

00000000 F *UND* 00000000 sleep@@GLIBC_2.0

10000674 g F .fini 00000000 _fini

1001072c g O .dtors 00000000 .hidden __DTOR_END__

10010804 g .data 00000000 __data_start

00000000 w *UND* 00000000 __gmon_start__

10010808 g O .data 00000000 .hidden __dso_handle

100006b4 g O .rodata 00000004 _IO_stdin_used

00000000 F *UND* 00000000 __libc_start_main@@GLIBC_2.0

10000554 g F .text 000000b4 __libc_csu_init

10018820 g .got 00000000 _SDA_BASE_

00000000 F *UND* 00000000 putchar@@GLIBC_2.0

100108ac g *ABS* 00000000 _end

1000032c g F .text 00000024 _start

10010820 g *ABS* 00000000 __bss_start

100004f4 g F .text 0000005c main

00000000 w *UND* 00000000 _Jv_RegisterClasses

1001080c g O .data 00000000 .hidden __TMC_END__

00000000 w *UND* 00000000 _ITM_registerTMCloneTable

100002e0 g F .init 00000000 _init

Elvis Dowson

Khem Raj

#8407

On Sat, Aug 4, 2012 at 8:12 AM, Elvis Dowson <elvis.dowson@...> wrote:
/lib/ld.so.1does this file exist on target ?

Elvis Dowson

#8408

Hi,

On Aug 4, 2012, at 8:31 PM, Khem Raj wrote:

On Sat, Aug 4, 2012 at 8:12 AM, Elvis Dowson <elvis.dowson@...> wrote:
/lib/ld.so.1does this file exist on target ?Yes, it does. It is a soft link to /lib/ld-2.16.so (136.4kb)

Both files exist on the target.

What should I do next?

Elvis Dowson

Khem Raj

#8409

On Sat, Aug 4, 2012 at 9:53 AM, Elvis Dowson <elvis.dowson@...> wrote:
Hi,

On Aug 4, 2012, at 8:31 PM, Khem Raj wrote:

On Sat, Aug 4, 2012 at 8:12 AM, Elvis Dowson <elvis.dowson@...> wrote:
/lib/ld.so.1does this file exist on target ?Yes, it does. It is a soft link to /lib/ld-2.16.so (136.4kb)

Both files exist on the target.

What should I do next?
Try to see if /lib/ld.so.1 runs ok ?

Then try

LD_DEBUG=all /lib/ld.so.1 ./helloworlddynamic
and see how far it goes.

Elvis Dowson

Elvis Dowson

#8410

Hi Khem,

On Aug 4, 2012, at 9:12 PM, Khem Raj wrote:

Try to see if /lib/ld.so.1 runs ok ?How can I run /lib/ld.so.1?

Elvis Dowson

Khem Raj

#8414

On Sat, Aug 4, 2012 at 12:16 PM, Elvis Dowson <elvis.dowson@...> wrote:
Hi Khem,

On Aug 4, 2012, at 9:12 PM, Khem Raj wrote:

Try to see if /lib/ld.so.1 runs ok ?How can I run /lib/ld.so.1?
 /lib/ld.so.1

Elvis Dowson

Elvis Dowson

#8429

Hi,

I decided to modify the bash and busybox recipes to build statically, and try to create a core-image-minimal root filesystem, so that I can get a sensible prompt with paths set, etc, to debug the dynamic linking issue.

Just copying a static bash binary to the root of the ramdisk image and specifying init=/bash didn't work for a static bash+core-image-minimal root filesystem, it aborts with a panic. If I have only the bash executable in the ramdisk and nothing else, it displays the bash prompt.

Now, I've noticed something weird during core-image-minimal image generation.

When I build the static versions of bash, the size of the binary is 8MB, but when I explore the binary in the tar.gz image or extract it to my ramdisk, it shows as being only 1.6MB.

How can there be a difference between the statically built bash file

/tool/yocto/poky/build/tmp/work/ppc440-poky-linux/bash-4.2-r4/image/bin/bash (8MB)

and in the file contained in the core-image-minimal-virtex-5.tar.gz

/bin/bash (1.6MB)

I'm seeing the same discrepancy for busybox

/tool/yocto/poky/build/tmp/work/ppc440-poky-linux/busybox-1.19.4-r18/image/bin/busybox (8.2 MB)

and in the generate rootfs image

/bin/busybox (1.4MB)

This shouldn't happen, right?

Best regards,

Elvis Dowson

Khem Raj

#8430

On Tue, Aug 7, 2012 at 1:10 PM, Elvis Dowson <elvis.dowson@...> wrote:
Hi,
        I decided to modify the bash and busybox recipes to build
statically, and try to create a core-image-minimal root filesystem, so that
I can get a sensible prompt with paths set, etc, to debug the dynamic
linking issue.

Just copying a static bash binary to the root of the ramdisk image and
specifying init=/bash didn't work for a static bash+core-image-minimal root
filesystem, it aborts with a panic. If I have only the bash executable in
the ramdisk and nothing else, it displays the bash prompt.

Now, I've noticed something weird during core-image-minimal image
generation.

When I build the static versions of bash, the size of the binary is 8MB, but
when I explore the binary in the tar.gz image or extract it to my ramdisk,
it shows as being only 1.6MB.

How can there be a difference between the statically built bash file

/tool/yocto/poky/build/tmp/work/ppc440-poky-linux/bash-4.2-r4/image/bin/bash
(8MB)

and in the file contained in the core-image-minimal-virtex-5.tar.gz

/bin/bash (1.6MB)

I'm seeing the same discrepancy for busybox

/tool/yocto/poky/build/tmp/work/ppc440-poky-linux/busybox-1.19.4-r18/image/bin/busybox
(8.2 MB)

and in the generate rootfs image

/bin/busybox (1.4MB)

This shouldn't happen, right?I assume they are stripped in case where they are smaller.


Best regards,

Elvis Dowson

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Elvis Dowson

#8431

Hi,

On Aug 8, 2012, at 12:13 AM, Khem Raj wrote:

On Tue, Aug 7, 2012 at 1:10 PM, Elvis Dowson <elvis.dowson@...> wrote:
Hi,
I decided to modify the bash and busybox recipes to build
statically, and try to create a core-image-minimal root filesystem, so that
I can get a sensible prompt with paths set, etc, to debug the dynamic
linking issue.

Just copying a static bash binary to the root of the ramdisk image and
specifying init=/bash didn't work for a static bash+core-image-minimal root
filesystem, it aborts with a panic. If I have only the bash executable in
the ramdisk and nothing else, it displays the bash prompt.

Now, I've noticed something weird during core-image-minimal image
generation.

When I build the static versions of bash, the size of the binary is 8MB, but
when I explore the binary in the tar.gz image or extract it to my ramdisk,
it shows as being only 1.6MB.

How can there be a difference between the statically built bash file

/tool/yocto/poky/build/tmp/work/ppc440-poky-linux/bash-4.2-r4/image/bin/bash
(8MB)

and in the file contained in the core-image-minimal-virtex-5.tar.gz

/bin/bash (1.6MB)

I'm seeing the same discrepancy for busybox

/tool/yocto/poky/build/tmp/work/ppc440-poky-linux/busybox-1.19.4-r18/image/bin/busybox
(8.2 MB)

and in the generate rootfs image

/bin/busybox (1.4MB)

This shouldn't happen, right?

I assume they are stripped in case where they are smaller.

I tried running the newly created root filesystem, and passed init=/bin/bash to the kernel boot args, and get the kernel panic, as shown below. It doesn't happen when I just have only a static bash binary alone, in the ramdisk.

zImage starting: loaded at 0x00800000 (sp: 0x015cffb0)

Allocating 0x540e0c bytes for kernel ...

gunzipping (0x00000000 <- 0x0080f000:0x00a17de0)...done 0x4235c0 bytes

Attached initrd image at 0x00a18000-0x015cec21

initrd head: 0x1f8b0808

Linux/PowerPC load: console=ttyS0,9600n8 ip=off root=/dev/ram rw rootwait init=/bin/bash

Finalizing device tree... flat tree at 0x15dc0e0

PM: Adding info for No Bus:ttyv9

[ 0.555146] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled

[ 0.560456] 83e00000.serial: ttyS0 at MMIO 0x83e01003 (irq = 20) is a 16550

[ 0.755976] console [ttyS0] enabled

[ 0.820014] brd: module loaded

[ 0.866758] loop: module loaded

[ 0.903967] xsysace 83600000.sysace: Xilinx SystemACE revision 1.0.12

[ 0.980712] xsysace 83600000.sysace: No CF in slot

[ 1.039777] Xilinx SystemACE device driver, major=254

[ 1.100658] xilinx_emaclite 81000000.ethernet: Device Tree Probing

[ 1.174186] xilinx_emaclite 81000000.ethernet: error registering MDIO bus

[ 1.255272] xilinx_emaclite 81000000.ethernet: MAC address is now 00:0a:35:b7:78:00

[ 1.348888] xilinx_emaclite 81000000.ethernet: Xilinx EmacLite at 0x81000000 mapped to 0xD10A0000, irq=17

[ 1.463802] xilinx_ps2 81480000.ps2: Device Tree Probing 'ps2'

[ 1.533064] xilinx_ps2 81480000.ps2: Xilinx PS2 at 0x81480000 mapped to 0xd1036000, irq=22

[ 1.632441] xilinx_ps2 81481000.ps2: Device Tree Probing 'ps2'

[ 1.702118] xilinx_ps2 81481000.ps2: Xilinx PS2 at 0x81481000 mapped to 0xd1038000, irq=23

[ 1.802689] mousedev: PS/2 mouse device common for all mice

[ 1.870186] i2c /dev entries driver

[ 1.911796] Device Tree Probing 'i2c'

[ 1.956057] xilinx-iic #0 at 0x81600000 mapped to 0xD10C0000, irq=18

[ 2.033628] TCP cubic registered

[ 2.071533] NET: Registered protocol family 17

[ 2.866390] atkbd serio0: keyboard reset failed on xilinxps2/serio at 81480000

[ 3.350664] RAMDISK: gzip image found at block 0

<7>[ 3.870893] device: 'input0': device_add

[ 3.971153] input: AT Raw Set 2 keyboard as /devices/plb.0/xps-ps2.1/81481000.ps2/serio1/input/input0

[ 6.262826] VFS: Mounted root (ext2 filesystem) on device 1:0.

[ 6.332844] Freeing unused kernel memory: 152k freed

[ 6.439032] Kernel panic - not syncing: Attempted to kill init!

[ 6.509122] Rebooting in 180 seconds..

I need bash to run, with a representative rootfilesystem, with all the libraries, so that I can run the commands that you asked me to earlier:

/lib/ld.so.1

and then

LD_DEBUG=all /lib/ld.so.1 ./helloworlddynamic

Is there something that I can disable to get static bash to run to the prompt, with the core-image-minimal image?

Elvis Dowson

Khem Raj

#8432

On Tue, Aug 7, 2012 at 1:24 PM, Elvis Dowson <elvis.dowson@...> wrote:

Is there something that I can disable to get static bash to run to the
prompt, with the core-image-minimal image?well compile bash or dash as static and copy it manually into the
rootfile system
nfs root works well for such experiments. Do you have that option ?

Elvis Dowson

#8433

Hi,

On Aug 8, 2012, at 0:30, Khem Raj <raj.khem@...> wrote:

On Tue, Aug 7, 2012 at 1:24 PM, Elvis Dowson <elvis.dowson@...> wrote:

Is there something that I can disable to get static bash to run to the
prompt, with the core-image-minimal image?well compile bash or dash as static and copy it manually into the
rootfile system
nfs root works well for such experiments. Do you have that option ?I tired manually copying the static bash binary 8mb, over to the ramdisk root folder. The problem still manifests, if there is no other file other than the static bash file, it displays the prompt. If the core-minimal-console image exists, along with the static bash binary in the root location, it gives the kernel panic, as shown above.

Best regards,

Elvis

Elvis Dowson

#8436

Hi,

I was just going through the recipes-devtools/gcc/gcc-common.inc file, and noticed the following snippet:

def get_gcc_multiarch_setting(bb, d):

target_arch = d.getVar('TRANSLATED_TARGET_ARCH', True)

multiarch_options = {

"i586": "--enable-targets=all",

"powerpc": "--enable-targets=powerpc64",

"sparc": "--enable-targets=all",

}

My target is a 32-bit ppc440 cpu. What is the impact of an incorrectly set multiarch_options for powerpc to powerpc64 on the final build?

Elvis Dowson

Khem Raj

#8437

On Tue, Aug 7, 2012 at 7:36 PM, Elvis Dowson <elvis.dowson@...> wrote:
Hi,
      I was just going through the recipes-devtools/gcc/gcc-common.inc file,
and noticed the following snippet:

def get_gcc_multiarch_setting(bb, d):
    target_arch = d.getVar('TRANSLATED_TARGET_ARCH', True)
    multiarch_options = {
        "i586":    "--enable-targets=all",
        "powerpc": "--enable-targets=powerpc64",
        "sparc":   "--enable-targets=all",
    }

My target is a 32-bit ppc440 cpu. What is the impact of an incorrectly set
multiarch_options for powerpc to  powerpc64 on the final build?

thats not a issue.

Elvis Dowson

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Unable to get serial console login prompt - PowerPC 440 Virtex 5 processor