Example Analysis of Linux loading vmlinux debugging
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Use gdb to load kernel symbol tables
Arm-eabi-gdb out/target/product/msm8625/obj/KERNEL_OBJ/vmlinux
Open DEBUG_INFO and DEBUG_VM in .config of the kernel
Locate the fault code
(gdb) l * qrd7627a_add_io_devices+0x1000xc07cd05c is in qrd7627a_add_io_devices (/ home/yejialong/GH700C/kernel/arch/arm/mach-msm/msm8x25/goso-msm7627a-io.c:1851). 1846} else if (machine_is_msm8625q_skud () | | machine_is_msm8625q_evbd ()) {1847 # ifndef CONFIG_CALA021848 platform_device_register (& pmic_mpp_leds_pdev_skud) 1849 # endif1850 / * enable the skud flash and torch by gpio leds driver * / 1851 platform_device_register (& gpio_flash_skud); 1852} else if (machine_is_msm8625q_skue ()) {1853 / * enable the skue flashlight by gpio leds driver * / 1854 platform_device_register (& gpio_flash_skue); 1855}
Here is how the mtk platform loads, but no matter which platform is the same, the reason is the same.
Weiqifa@weiqifa-Inspiron-3847:~/weiqifa/tm100 $. / prebuilts/gcc/linux-x86/arm/arm-eabi-4.7/bin/arm-eabi-gdb. / out/target/product/tm100/obj/KERNEL_OBJ/vmlinuxGNU gdb (GDB) 7.3.1-gg2Copyright (C) 2011 Free Software Foundation, Inc.License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it.There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details.This GDB was configured as "--host=x86_64-linux-gnu-- target=arm-linux-android" .for bug reporting instructions, please see:...Reading symbols from / home/weiqifa/weiqifa/tm100/out/target/product/tm100/obj/KERNEL_OBJ/vmlinux...done. (gdb)
Rockchip rk3399 debug vmlinux
. / prebuilts/gcc/linux-x86/aarch74/aarch74-linux-android-4.9/bin/aarch74-linux-android-addr2line-f-e kernel/vmlinuxweiqifa@dev:~/rk3399_7in1 $. / prebuilts/gcc/linux-x86/aarch74/aarch74-linux-android-4.9/bin/aarch74-linux-android-addr2line-f-e kernel/vmlinux ffffff8008459f3crk_iommu_domain_free/data/weiqifa/rk3399_7in1/kernel/drivers/iommu/rockchip-iommu.c:1005 (discriminator 2) weiqifa@dev:~/rk3399_7in1 $
Tombstone debugging of RK platform
. / prebuilts/gcc/linux-x86/arm/arm-eabi-4.8/bin/arm-eabi-addr2line-e. / out/target/product/rk3399_mid/symbols/system/lib/libspeexresampler.so 0x00002d54/proc/self/cwd/external/speex/libspeex/resample.c:376
Arm-eabi-gdb first uses the command to find this thing, and then goes to find vmlinux and I can only use this version of arm-eabi-4.7/. I tried this one.
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