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È磺#define _syscall1(type,name,type1,arg1) \
type name(type1 arg1) \
{ \
long __res; \
__asm__ volatile ("push %%ebx ; movl %2,%%ebx ; int $0x80 ; pop %%ebx" \
: "=a" (__res) \
: "0" (__NR_##name),"ri" ((long)(arg1)) : "memory"); \
__syscall_return(type,__res); \
}
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ouput£º _res 0%  __NR##name  “=a”±íʾ´æ·ÅÔÚeax¼Ä´æÆ÷
       Ò²¾ÍÊDZíʾ°Ñ±äÁ¿_res´æ·ÅÔÚeaxÖУ¬“0”±íʾ°Ñ_NR##name¹ØÁªµ½0%¼´_res£®·µ»ØÖµÒ²´æ·ÅÔÚeaxÖУ®
 
       #define _syscall2(type,name,type1,arg1,type2,arg2) \
type name(type1 arg1,type2 arg2) \
{ \
long __res; \
__asm__ volatile ("push %%ebx ; movl %2,%%ebx ; int $0x80 ; pop %%ebx" \
       : "=a" (__res) \
       : "0" (__NR_##name),"ri" ((long)(arg1)),"c" ((long)(arg2)) \
              : "memory"); \
__syscall_return(type,__res); \
}
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set_system_gate(SYSCALL_VECTOR,&system_call);
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ENTRY(system_call)
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