Kernel debug-objdump

objdump

Debugging Linux kernel using "objdump"

To create objdump file include source and symbol address and line numbers.
/home/satishg/gcc/arm-2010q1/bin/arm-none-linux-gnueabi-objdump -l -S -d vmlinux > vmlinux.asm

Use System.map file to find base address of function "am3517_evm_init"
cat System.map | grep -n am3517_evm_init
38140:c0623668 t am3517_evm_init

38140 is line number in System.map.
c0623668 is the address of function am3517_evm_init.

Using this address(c0623668), search in vmlinux.asm file, with following command
vim vmlinux.asm  |  grep  -n  c0623668


c0623668 <am3517_evm_init>:
am3517_evm_init():
/home/satishg/qemu/linux-3.2/arch/arm/mach-omap2/board-am3517evm.c:459

static struct omap_board_config_kernel am3517_evm_config[] __initdata = {
};

static void __init am3517_evm_init(void)
{
c0623668:       e92d4070        push    {r4, r5, r6, lr}
/home/satishg/qemu/linux-3.2/arch/arm/mach-omap2/board-am3517evm.c:461
        omap_board_config = am3517_evm_config;
        omap_board_config_size = ARRAY_SIZE(am3517_evm_config);
c062366c:       e3a04000        mov     r4, #0
c0623670:       e59f21a4        ldr     r2, [pc, #420]  ; c062381c <am3517_evm_init+0x1b4>
/home/satishg/qemu/linux-3.2/arch/arm/mach-omap2/board-am3517evm.c:460
static struct omap_board_config_kernel am3517_evm_config[] __initdata = {
};

static void __init am3517_evm_init(void)
{
        omap_board_config = am3517_evm_config;
c0623674:       e59f61a4        ldr     r6, [pc, #420]  ; c0623820 <am3517_evm_init+0x1b8>
c0623678:       e59f51a4        ldr     r5, [pc, #420]  ; c0623824 <am3517_evm_init+0x1bc>
/home/satishg/qemu/linux-3.2/arch/arm/mach-omap2/board-am3517evm.c:462
        omap_board_config_size = ARRAY_SIZE(am3517_evm_config);
        omap3_mux_init(board_mux, OMAP_PACKAGE_CBB);
c062367c:       e3a01004        mov     r1, #4
/home/satishg/qemu/linux-3.2/arch/arm/mach-omap2/board-am3517evm.c:460
static struct omap_board_config_kernel am3517_evm_config[] __initdata = {
};

static void __init am3517_evm_init(void)
{
        omap_board_config = am3517_evm_config;
c0623680:       e5865000        str     r5, [r6]
/home/satishg/qemu/linux-3.2/arch/arm/mach-omap2/board-am3517evm.c:461
        omap_board_config_size = ARRAY_SIZE(am3517_evm_config);
c0623684:       e5824000        str     r4, [r2]
/home/satishg/qemu/linux-3.2/arch/arm/mach-omap2/board-am3517evm.c:462
        omap3_mux_init(board_mux, OMAP_PACKAGE_CBB);
c0623688:       e1a00005        mov     r0, r5
c062368c:       ebffe9e6        bl      c061de2c <omap3_mux_init>
am3517_evm_i2c_init():

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