本文描述了搭建android核心除錯的過程，最終達到原始碼級除錯的目的。由於真機除錯核心的步驟比較複雜，這裡先用模擬器為例。
硬體環境
軟體環境
工具模擬器
android 4.4.2，核心：goldfish3.4
aosp prebuilt
使用/arch/arm/configs/goldfish_armv7_defconfig作為核心配置檔案進行配置，
root@tangxx
:~/android_source/android_442/kernel/goldfish
# export cross_compile=arm-eabi-
root@tangxx
:~/android_source/android_442/kernel/goldfish
# export subarch=arm
root@tangxx
:~/android_source/android_442/kernel/goldfish
# export arch=arm
root@tangxx
:~/android_source/android_442/kernel/goldfish
# make goldfish_armv7_defconfig
hostcc scripts/basic/fixdep
hostcc scripts/kconfig/conf.o
shipped scripts/kconfig/zconf.tab.c
shipped scripts/kconfig/zconf.lex.c
shipped scripts/kconfig/zconf.hash.c
hostcc scripts/kconfig/zconf.tab.o
hostld scripts/kconfig/conf
## configuration written to .config
#
config_highmem=y #允許設定模擬器記憶體
config_debug_info=y #顯示vmlinux符號
config_debug_kernel=y #開啟核心除錯
config_kgdb=y #開啟kgdb
root@tangxx
:~/android_source/android_442/kernel/goldfish
#make
…kernel
: arch/arm/boot/zimage is ready
root@tangxx
:~/android_source/android_442/kernel/goldfish
# emulator -verbose -show-kernel -kernel ./arch/arm/boot/zimage -qemu -s –s
開啟另外乙個終端啟動偵錯程式，載入核心符號，
root@tangxx:~/android_source/android_442# cd kernel/goldfish
root@tangxx:~/android_source/android_442/kernel/goldfish# arm-eabi-gdb ./vmlinuxgnu gdb (gdb) 7.3.1-gg2
license gplv3+: gnu gpl version
3or 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 /root/android_source/android_442/kernel/goldfish/vmlinux...done.
(gdb) target remote :1234
remote debugging using :1234
?? () at arch/arm/kernel/entry-armv.s:1181
1181 w(b) vector_rst
(gdb) list
1176
.globl vector_fiq_offset
1177
.equ vector_fiq_offset, vector_fiq
1178
1179
.section
.vectors, "ax", %progbits
1180 __vectors_start:
1181 w(b) vector_rst
1182 w(b) vector_und
1183 w(ldr) pc, __vectors_start + 0x1000
1184 w(b) vector_pabt
1185 w(b) vector_dabt
(gdb) c
continuing.
^cprogram received signal sigint, interrupt.
cpu_v7_do_idle () at arch/arm/mm/proc-v7.s:74
74mov pc, lr
(gdb) list
69 * irqs are already disabled.
70 */
71 entry(cpu_v7_do_idle)
72 dsb @ wfi may enter a low-power mode
73 wfi
74mov pc, lr
75 endproc(cpu_v7_do_idle)
7677 entry(cpu_v7_dcache_clean_area)
78#ifndef tlb_can_read_from_l1_cache
(gdb) disas
dump of assembler code for function cpu_v7_do_idle:
0xc00158e0
: dsb sy
0xc00158e4
: wfi
=> 0xc00158e8
: mov pc, lr
end of assembler dump.
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