为什么汇编中可以使用这种语法，我好像没有发现汇编中有这种语法？请指点
#include
#include
#include
#include
#include
EBX = 0x00
ECX = 0x04
EDX = 0x08
ESI = 0x0C
EDI = 0x10
EBP = 0x14
EAX = 0x18
DS = 0x1C
ES = 0x20
ORIG_EAX = 0x24
EIP = 0x28
CS = 0x2C
EFLAGS = 0x30
OLDESP = 0x34
OLDSS = 0x38
CF_MASK = 0x00000001
IF_MASK = 0x00000200
NT_MASK = 0x00004000
VM_MASK = 0x00020000
/*
* these are offsets into the task-struct.
*/
state = 0
flags = 4
sigpending = 8
addr_limit = 12
exec_domain = 16
need_resched = 20
tsk_ptrace = 24
processor = 52
ENOSYS = 38
#define SAVE_ALL \
cld; \
pushl %es; \
pushl %ds; \
pushl %eax; \
pushl %ebp; \
pushl %edi; \
pushl %esi; \
pushl %edx; \
pushl %ecx; \
pushl %ebx; \
movl $(__KERNEL_DS),%edx; \
movl %edx,%ds; \
movl %edx,%es;