unistd.h

Linux内核源代码 为压缩文件 是<<Linux内核>>一书中的源代码

		  "move\t%1, $7" \
                  : "=r" (__res), "=r" (__err) \
                  : "i" (__NR_##name),"r" ((long)(a)), \
                                      "r" ((long)(b)), \
                                      "r" ((long)(c)) \
		  : "$2","$4","$5","$6","$7","$8","$9","$10","$11","$12", \
		    "$13","$14","$15","$24"); \
if (__err == 0) \
	return (type) __res; \
errno = __res; \
return -1; \
}

#define _syscall4(type,name,atype,a,btype,b,ctype,c,dtype,d) \
type name (atype a, btype b, ctype c, dtype d) \
{ \
long __res, __err; \
__asm__ volatile ("move\t$4, %3\n\t" \
                  "move\t$5, %4\n\t" \
                  "move\t$6, %5\n\t" \
                  "move\t$7, %6\n\t" \
		  "li\t$2, %2\n\t" \
		  "syscall\n\t" \
		  "move\t%0, $2\n\t" \
		  "move\t%1, $7" \
                  : "=r" (__res), "=r" (__err) \
                  : "i" (__NR_##name),"r" ((long)(a)), \
                                      "r" ((long)(b)), \
                                      "r" ((long)(c)), \
                                      "r" ((long)(d)) \
                  : "$2","$4","$5","$6","$7","$8","$9","$10","$11","$12", \
		    "$13","$14","$15","$24"); \
if (__err == 0) \
	return (type) __res; \
errno = __res; \
return -1; \
}

#if (_MIPS_SIM == _ABIN32) || (_MIPS_SIM == _ABI64)

#define _syscall5(type,name,atype,a,btype,b,ctype,c,dtype,d,etype,e) \
type name (atype a,btype b,ctype c,dtype d,etype e) \
{ \
long __res, __err; \
__asm__ volatile ("move\t$4, %3\n\t" \
                  "move\t$5, %4\n\t" \
                  "move\t$6, %5\n\t" \
                  "move\t$7, %6\n\t" \
		  "move\t$8, %7\n\t" \
		  "sw\t$2, 16($29)\n\t" \
		  "li\t$2, %2\n\t" \
		  "syscall\n\t" \
		  "move\t%0, $2\n\t" \
		  "move\t%1, $7" \
                  : "=r" (__res), "=r" (__err) \
                  : "i" (__NR_##name),"r" ((long)(a)), \
                                      "r" ((long)(b)), \
                                      "r" ((long)(c)), \
                                      "r" ((long)(d)), \
                                      "r" ((long)(e)) \
                  : "$2","$4","$5","$6","$7","$8","$9","$10","$11","$12", \
                    "$13","$14","$15","$24"); \
if (__err == 0) \
	return (type) __res; \
errno = __res; \
return -1; \
}

#define _syscall6(type,name,atype,a,btype,b,ctype,c,dtype,d,etype,e,ftype,f) \
type name (atype a,btype b,ctype c,dtype d,etype e,ftype f) \
{ \
long __res, __err; \
__asm__ volatile ("move\t$4, %3\n\t" \
                  "move\t$5, %4\n\t" \
                  "move\t$6, %5\n\t" \
                  "move\t$7, %6\n\t" \
                  "move\t$8, %7\n\t" \
                  "move\t$9, %8\n\t" \
		  "li\t$2, %2\n\t" \
		  "syscall\n\t" \
		  "move\t%0, $2\n\t" \
		  "move\t%1, $7" \
                  : "=r" (__res), "=r" (__err) \
                  : "i" (__NR_##name),"r" ((long)(a)), \
                                      "r" ((long)(b)), \
                                      "r" ((long)(c)), \
                                      "r" ((long)(d)), \
                                      "m" ((long)(e)), \
                                      "m" ((long)(f)) \
                  : "$2","$3","$4","$5","$6","$7","$8","$9","$10","$11", \
                    "$12","$13","$14","$15","$24"); \
if (__err == 0) \
	return (type) __res; \
errno = __res; \
return -1; \
}

#define _syscall7(type,name,atype,a,btype,b,ctype,c,dtype,d,etype,e,ftype,f,gtype,g) \
type name (atype a,btype b,ctype c,dtype d,etype e,ftype f,gtype g) \
{ \
long __res, __err; \
__asm__ volatile ("move\t$4, %3\n\t" \
                  "move\t$5, %4\n\t" \
                  "move\t$6, %5\n\t" \
                  "move\t$7, %6\n\t" \
                  "move\t$8, %7\n\t" \
                  "move\t$9, %8\n\t" \
                  "move\t$10, %9\n\t" \
		  "li\t$2, %2\n\t" \
		  "syscall\n\t" \
		  "move\t%0, $2\n\t" \
		  "move\t%1, $7" \
                  : "=r" (__res), "=r" (__err) \
                  : "i" (__NR_##name),"r" ((long)(a)), \
                                      "r" ((long)(b)), \
                                      "r" ((long)(c)), \
                                      "r" ((long)(d)), \
                                      "r" ((long)(e)), \
                                      "r" ((long)(f)), \
                                      "r" ((long)(g)) \
                  : "$2","$3","$4","$5","$6","$7","$8","$9","$10","$11", \
                    "$12","$13","$14","$15","$24"); \
if (__err == 0) \
	return (type) __res; \
errno = __res; \
return -1; \
}

#else /* not N32 or 64 ABI */

/* These are here for sake of fucking lusercode living in the fucking believe
   having to fuck around with the syscall interface themselfes.  */

#define _syscall5(type,name,atype,a,btype,b,ctype,c,dtype,d,etype,e) \
type name (atype a,btype b,ctype c,dtype d,etype e) \
{ \
long __res, __err; \
__asm__ volatile ("move\t$4, %3\n\t" \
                  "move\t$5, %4\n\t" \
                  "move\t$6, %5\n\t" \
		  "lw\t$2, %7\n\t" \
                  "move\t$7, %6\n\t" \
		  "subu\t$29, 24\n\t" \
		  "sw\t$2, 16($29)\n\t" \
		  "li\t$2, %2\n\t" \
		  "syscall\n\t" \
		  "move\t%0, $2\n\t" \
		  "move\t%1, $7" \
		  "addiu\t$29,24" \
                  : "=r" (__res), "=r" (__err) \
                  : "i" (__NR_##name),"r" ((long)(a)), \
                                      "r" ((long)(b)), \
                                      "r" ((long)(c)), \
                                      "r" ((long)(d)), \
                                      "m" ((long)(e)) \
                  : "$2","$4","$5","$6","$7","$8","$9","$10","$11","$12", \
                    "$13","$14","$15","$24"); \
if (__err == 0) \
	return (type) __res; \
errno = __res; \
return -1; \
}

#define _syscall6(type,name,atype,a,btype,b,ctype,c,dtype,d,etype,e,ftype,f) \
type name (atype a,btype b,ctype c,dtype d,etype e,ftype f) \
{ \
long __res, __err; \
__asm__ volatile ("move\t$4, %3\n\t" \
                  "move\t$5, %4\n\t" \
                  "move\t$6, %5\n\t" \
		  "lw\t$2, %7\n\t" \
		  "lw\t$3, %8\n\t" \
                  "move\t$7, %6\n\t" \
		  "subu\t$29, 24\n\t" \
		  "sw\t$2, 16($29)\n\t" \
		  "sw\t$3, 20($29)\n\t" \
		  "li\t$2, %2\n\t" \
                  "syscall\n\t" \
		  "move\t%0, $2\n\t" \
		  "move\t%1, $7" \
		  "addiu\t$29, 24" \
                  : "=r" (__res), "=r" (__err) \
                  : "i" (__NR_##name),"r" ((long)(a)), \
                                      "r" ((long)(b)), \
                                      "r" ((long)(c)), \
                                      "r" ((long)(d)), \
                                      "m" ((long)(e)), \
                                      "m" ((long)(f)) \
                  : "$2","$3","$4","$5","$6","$7","$8","$9","$10","$11", \
                    "$12","$13","$14","$15","$24"); \
if (__err == 0) \
	return (type) __res; \
errno = __res; \
return -1; \
}

#define _syscall7(type,name,atype,a,btype,b,ctype,c,dtype,d,etype,e,ftype,f,gtype,g) \
type name (atype a,btype b,ctype c,dtype d,etype e,ftype f,gtype g) \
{ \
long __res, __err; \
__asm__ volatile ("move\t$4, %3\n\t" \
                  "move\t$5, %4\n\t" \
                  "move\t$6, %5\n\t" \
		  "lw\t$2, %7\n\t" \
		  "lw\t$3, %8\n\t" \
                  "move\t$7, %6\n\t" \
		  "subu\t$29, 32\n\t" \
		  "sw\t$2, 16($29)\n\t" \
		  "lw\t$2, %9\n\t" \
		  "sw\t$3, 20($29)\n\t" \
		  "sw\t$2, 24($29)\n\t" \
		  "li\t$2, %2\n\t" \
                  "syscall\n\t" \
		  "move\t%0, $2\n\t" \
		  "move\t%1, $7" \
		  "addiu\t$29, 32" \
                  : "=r" (__res), "=r" (__err) \
                  : "i" (__NR_##name),"r" ((long)(a)), \
                                      "r" ((long)(b)), \
                                      "r" ((long)(c)), \
                                      "r" ((long)(d)), \
                                      "m" ((long)(e)), \
                                      "m" ((long)(f)), \
                                      "m" ((long)(g)) \
                  : "$2","$3","$4","$5","$6","$7","$8","$9","$10","$11", \
                    "$12","$13","$14","$15","$24"); \
if (__err == 0) \
	return (type) __res; \
errno = __res; \
return -1; \
}

#endif

#ifdef __KERNEL_SYSCALLS__

/*
 * we need this inline - forking from kernel space will result
 * in NO COPY ON WRITE (!!!), until an execve is executed. This
 * is no problem, but for the stack. This is handled by not letting
 * main() use the stack at all after fork(). Thus, no function
 * calls - which means inline code for fork too, as otherwise we
 * would use the stack upon exit from 'fork()'.
 *
 * Actually only pause and fork are needed inline, so that there
 * won't be any messing with the stack from main(), but we define
 * some others too.
 */
#define __NR__exit __NR_exit
static inline _syscall0(int,sync)
static inline _syscall0(pid_t,setsid)
static inline _syscall3(int,write,int,fd,const char *,buf,off_t,count)
static inline _syscall3(int,read,int,fd,char *,buf,off_t,count)
static inline _syscall3(off_t,lseek,int,fd,off_t,offset,int,count)
static inline _syscall1(int,dup,int,fd)
static inline _syscall3(int,execve,const char *,file,char **,argv,char **,envp)
static inline _syscall3(int,open,const char *,file,int,flag,int,mode)
static inline _syscall1(int,close,int,fd)
static inline _syscall1(int,_exit,int,exitcode)
static inline _syscall3(pid_t,waitpid,pid_t,pid,int *,wait_stat,int,options)
static inline _syscall1(int,delete_module,const char *,name)

static inline pid_t wait(int * wait_stat)
{
	return waitpid(-1,wait_stat,0);
}

#endif /* !defined (__KERNEL_SYSCALLS__) */
#endif /* !defined (_LANGUAGE_ASSEMBLY) */

#endif /* _ASM_UNISTD_H */