Using GDB to find structure info

As usual  load elf file

$gdb vmlinux

We are going to inspect the address layout of structure platform_device,

struct platform_device {
        const char      *name;
        int             id;
        bool            id_auto;
        struct device   dev;
        u32             num_resources;
        struct resource *resource;

        const struct platform_device_id *id_entry;
        char *driver_override; /* Driver name to force a match */

        /* MFD cell pointer */
        struct mfd_cell *mfd_cell;

        /* arch specific additions */
        struct pdev_archdata    archdata;
};


(gdb) p &((struct platform_device *)0)->name
$2 = (const char **) 0x0
(gdb) p &((struct platform_device *)0)->id
$3 = (int *) 0x8
(gdb) p &((struct platform_device *)0)->id_auto
$4 = (bool *) 0xc
(gdb) p &((struct platform_device *)0)->dev
$5 = (struct device *) 0x10

Above output shows the offset of different variables in the structure.