Mirrors_BOOKS/LDD-LinuxDeviceDrivers
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获取gdt...

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gatieme
2017-03-23 20:55:33 +08:00
parent dbabd18a46
commit 91aaf409d9
8 changed files with 1468 additions and 0 deletions
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study/kernel/03-vmarea/00-code/02-gdt_table/.get_gdt_table.ko.cmd
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cmd_/home/gatieme/Work/GitHub/LDD-LinuxDeviceDrivers/study/kernel/03-vmarea/00-code/02-gdt_table/get_gdt_table.ko := ld -r -m elf_x86_64 -T ./scripts/module-common.lds --build-id -o /home/gatieme/Work/GitHub/LDD-LinuxDeviceDrivers/study/kernel/03-vmarea/00-code/02-gdt_table/get_gdt_table.ko /home/gatieme/Work/GitHub/LDD-LinuxDeviceDrivers/study/kernel/03-vmarea/00-code/02-gdt_table/get_gdt_table.o /home/gatieme/Work/GitHub/LDD-LinuxDeviceDrivers/study/kernel/03-vmarea/00-code/02-gdt_table/get_gdt_table.mod.o
study/kernel/03-vmarea/00-code/02-gdt_table/.get_gdt_table.mod.o.cmd
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study/kernel/03-vmarea/00-code/02-gdt_table/.get_gdt_table.o.cmd
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study/kernel/03-vmarea/00-code/02-gdt_table/.tmp_versions/get_gdt_table.mod
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/home/gatieme/Work/GitHub/LDD-LinuxDeviceDrivers/study/kernel/03-vmarea/00-code/02-gdt_table/get_gdt_table.ko
/home/gatieme/Work/GitHub/LDD-LinuxDeviceDrivers/study/kernel/03-vmarea/00-code/02-gdt_table/get_gdt_table.o
study/kernel/03-vmarea/00-code/02-gdt_table/Module.symvers
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study/kernel/03-vmarea/00-code/02-gdt_table/get_gdt_table.c
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MODULE_LICENSE("Dual BSD/GPL");
#define BitGet(number, pos) ((number) >> (pos) & 1) /// 用宏得到某数的某位
#define BitSet(number, pos) ((number) |= 1 << (pos)) /// 把某位置1
#define BitClr(number, pos) ((number) &= ~(1 << (pos))) /// 把某位清0
#define BitCpl(number, pos) ((number) ^= 1 << (pos)) /// 把number的POS位取反
// http://lxr.free-electrons.com/source/arch/x86/include/asm/segment.h#L123
static void print_segment(void)
{
long data = 0;
/*
---------------------------------------------------------------------------------------------
| | INDEX | TI| RPL |
---------------------------------------------------------------------------------------------
__KERNEL_CS = 0x0010 = B 0 0 0 0 0 0 0 0 0 0 0 1 0 | 0 | 0 0 | index = 2, TI = 0, RPL = 0
---------------------------------------------------------------------------------------------
__KERNEL_DS = 0x0018 = B 0 0 0 0 0 0 0 0 0 0 0 1 1 | 0 | 0 0 | index = 3, TI = 0, RPL = 0
---------------------------------------------------------------------------------------------
__USER_DS = 0x0033 = B 0 0 0 0 0 0 0 0 0 0 1 1 0 | 0 | 1 1 | index = 6, TI = 0, RPL = 3
---------------------------------------------------------------------------------------------
__USER_DS = 0x002B = B 0 0 0 0 0 0 0 0 0 0 1 0 1 | 0 | 1 1 | index = 5, TI = 0, RPL = 3
---------------------------------------------------------------------------------------------
| LE little-endian | 低字节 -=> 高字节 |
---------------------------------------------------------------------------------------------
__KERNEL_CS = 0x0010 = | 00010000 00000000 |
__KERNEL_DS = 0x0018 = | 00011000 00000000 |
__USER_DS = 0x0033 = | 00110011 00000000 |
__USER_DS = 0x002B = | 00101011 00000000 |
*/
data = __KERNEL_CS;
printk("__KERNEL_CS = %0x\n", data);
data = __KERNEL_DS;
printk("__KERNEL_DS = %0x\n", data);
data = __USER_CS;
printk("__USER_CS = %0x\n", data);
data = __USER_DS;
printk("__USER_DS = %0x\n", data);
}
static void print_desc_struct(struct desc_struct *desc)
{
#if 0
study/kernel/03-vmarea/00-code/02-gdt_table/get_gdt_table.mod.c
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#include <linux/module.h>
#include <linux/vermagic.h>
#include <linux/compiler.h>
MODULE_INFO(vermagic, VERMAGIC_STRING);
__visible struct module __this_module
__attribute__((section(".gnu.linkonce.this_module"))) = {
.name = KBUILD_MODNAME,
.init = init_module,
#ifdef CONFIG_MODULE_UNLOAD
.exit = cleanup_module,
#endif
.arch = MODULE_ARCH_INIT,
};
static const struct modversion_info ____versions[]
__used
__attribute__((section("__versions"))) = {
{ 0x9d35aeec, __VMLINUX_SYMBOL_STR(module_layout) },
{ 0x5ecfeec6, __VMLINUX_SYMBOL_STR(__per_cpu_offset) },
{ 0x37f1ffbf, __VMLINUX_SYMBOL_STR(gdt_page) },
{ 0x27e1a049, __VMLINUX_SYMBOL_STR(printk) },
{ 0xbdfb6dbb, __VMLINUX_SYMBOL_STR(__fentry__) },
};
static const char __module_depends[]
__used
__attribute__((section(".modinfo"))) =
"depends=";
MODULE_INFO(srcversion, "453437B362D9501283E72EE");
study/kernel/03-vmarea/00-code/02-gdt_table/modules.order
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kernel//home/gatieme/Work/GitHub/LDD-LinuxDeviceDrivers/study/kernel/03-vmarea/00-code/02-gdt_table/get_gdt_table.ko