syscall-ppc.h

xen 3.2.2 源码

#include <asm/unistd.h>
#include <errno.h>

#define __NR_io_setup		227
#define __NR_io_destroy		228
#define __NR_io_getevents	229
#define __NR_io_submit		230
#define __NR_io_cancel		231

/* On powerpc a system call basically clobbers the same registers like a
 * function call, with the exception of LR (which is needed for the
 * "sc; bnslr" sequence) and CR (where only CR0.SO is clobbered to signal
 * an error return status).
 */
#ifndef __syscall_nr
#define __syscall_nr(nr, type, name, args...)				\
	unsigned long __sc_ret, __sc_err;				\
	{								\
		register unsigned long __sc_0  __asm__ ("r0");		\
		register unsigned long __sc_3  __asm__ ("r3");		\
		register unsigned long __sc_4  __asm__ ("r4");		\
		register unsigned long __sc_5  __asm__ ("r5");		\
		register unsigned long __sc_6  __asm__ ("r6");		\
		register unsigned long __sc_7  __asm__ ("r7");		\
		register unsigned long __sc_8  __asm__ ("r8");		\
									\
		__sc_loadargs_##nr(name, args);				\
		__asm__ __volatile__					\
			("sc           \n\t"				\
			 "mfcr %0      "				\
			: "=&r" (__sc_0),				\
			  "=&r" (__sc_3),  "=&r" (__sc_4),		\
			  "=&r" (__sc_5),  "=&r" (__sc_6),		\
			  "=&r" (__sc_7),  "=&r" (__sc_8)		\
			: __sc_asm_input_##nr				\
			: "cr0", "ctr", "memory",			\
			        "r9", "r10","r11", "r12");		\
		__sc_ret = __sc_3;					\
		__sc_err = __sc_0;					\
	}								\
	if (__sc_err & 0x10000000) return -((int)__sc_ret);		\
	return (type) __sc_ret
#endif

#define __sc_loadargs_0(name, dummy...)					\
	__sc_0 = __NR_##name
#define __sc_loadargs_1(name, arg1)					\
	__sc_loadargs_0(name);						\
	__sc_3 = (unsigned long) (arg1)
#define __sc_loadargs_2(name, arg1, arg2)				\
	__sc_loadargs_1(name, arg1);					\
	__sc_4 = (unsigned long) (arg2)
#define __sc_loadargs_3(name, arg1, arg2, arg3)				\
	__sc_loadargs_2(name, arg1, arg2);				\
	__sc_5 = (unsigned long) (arg3)
#define __sc_loadargs_4(name, arg1, arg2, arg3, arg4)			\
	__sc_loadargs_3(name, arg1, arg2, arg3);			\
	__sc_6 = (unsigned long) (arg4)
#define __sc_loadargs_5(name, arg1, arg2, arg3, arg4, arg5)		\
	__sc_loadargs_4(name, arg1, arg2, arg3, arg4);			\
	__sc_7 = (unsigned long) (arg5)

#define __sc_asm_input_0 "0" (__sc_0)
#define __sc_asm_input_1 __sc_asm_input_0, "1" (__sc_3)
#define __sc_asm_input_2 __sc_asm_input_1, "2" (__sc_4)
#define __sc_asm_input_3 __sc_asm_input_2, "3" (__sc_5)
#define __sc_asm_input_4 __sc_asm_input_3, "4" (__sc_6)
#define __sc_asm_input_5 __sc_asm_input_4, "5" (__sc_7)

#define io_syscall1(type,fname,sname,type1,arg1)				\
type fname(type1 arg1)							\
{									\
	__syscall_nr(1, type, sname, arg1);				\
}

#define io_syscall2(type,fname,sname,type1,arg1,type2,arg2)		\
type fname(type1 arg1, type2 arg2)					\
{									\
	__syscall_nr(2, type, sname, arg1, arg2);			\
}

#define io_syscall3(type,fname,sname,type1,arg1,type2,arg2,type3,arg3)	\
type fname(type1 arg1, type2 arg2, type3 arg3)				\
{									\
	__syscall_nr(3, type, sname, arg1, arg2, arg3);			\
}

#define io_syscall4(type,fname,sname,type1,arg1,type2,arg2,type3,arg3,type4,arg4) \
type fname(type1 arg1, type2 arg2, type3 arg3, type4 arg4)		\
{									\
	__syscall_nr(4, type, sname, arg1, arg2, arg3, arg4);		\
}

#define io_syscall5(type,fname,sname,type1,arg1,type2,arg2,type3,arg3,type4,arg4,type5,arg5) \
type fname(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5)	\
{									\
	__syscall_nr(5, type, sname, arg1, arg2, arg3, arg4, arg5);	\
}