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POHello world kernel module for android & unknown relocation: 27 when insmod
 

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  1. POHello world kernel module for android & unknown relocation: 27 when insmod
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    <p>I am trying to create a simple kernel module. I am trying to print messages to dmesg but i keep getting</p> <p>insmod: init_module 'hello.ko' failed (Exec format error) in android</p> <p>after : dmesg: unknown relocation: 27</p> <pre><code>#include &lt;linux/module.h&gt; #include &lt;linux/kdb.h&gt; int init_module(void) { printk(KERN_ALERT "Hello world!\n"); return 1; } void cleanup_module(void) { printk(KERN_INFO "Goodbye world 1.\n"); } MODULE_AUTHOR("Robert P. J. Day"); MODULE_LICENSE("Dual BSD/GPL"); MODULE_VERSION("2:1.0") ; MODULE_DESCRIPTION("You have to start somewhere."); </code></pre> <p>The make file</p> <pre><code> obj-m +=hello.o KERNELDIR ?= ~/android/kernel/common #KERNELDIR ?= /lib/modules/$(shell uname -r)/build PWD := $(shell pwd) CROSS_COMPILE=~/android-ndk-r8/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86/bin/arm-linux-androideabi- ARCH=arm default: $(MAKE) -C $(KERNELDIR) M=$(PWD) ARCH=arm CROSS_COMPILE=$(CROSS_COMPILE) modules clean: $(MAKE) -C $(KERNELDIR) M=$(PWD) clean rm *.symvers </code></pre> <p>does anyone know why? And how to get it working?</p> <p>I found after doing a readelf that when it is compiled the relocation section is pointing to the wrong directions.</p> <pre><code>Offset Info Type Sym.Value Sym. Name 00000008 0000171b R_ARM_PLT32 00000000 printk </code></pre> <p>When in fact it should be:</p> <pre><code>Offset Info Type Sym.Value Sym. Name 00000008 0000171c R_ARM_CALL 00000000 printk </code></pre> <p>Can someone guess/know how this might be? Thanks @Chris Stratton for helping me this far.</p> <hr> <p>I found after doing a readelf that when it is compiled the relocation section is pointing to the wrong directions.</p> <pre><code>Offset Info Type Sym.Value Sym. Name 00000008 0000171b R_ARM_PLT32 00000000 printk </code></pre> <p>When in fact it should be:</p> <pre><code>Offset Info Type Sym.Value Sym. Name 00000008 0000171c R_ARM_CALL 00000000 printk </code></pre> <p>Can someone guess/know how this might be? Thanks @Chris Stratton for helping me this far.</p>
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    1. COProbably a build system problem. Are you sure you can use the ndk toolchain for a kernel? My recollection is that you could not in the past, but maybe that has changed. Could be worthwhile to objdump/readelf your module vs. any working one you can find and look at the types of relocations.
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    2. COI think we've got a lead.The difference i found when performing readelf was Flag was "0x5000000, Version5 EABI" for a running module and Flag is "0x4000000, Version4 EABI" for my module. Does this affect anything? I cannot find any place to change it. I am searching for it. If anyone knows please let me know.
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    3. COIt seems EABIs are backwards compatible so I was heading in the wrong direction there for a while.
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