#define SYSXTENSA_COUNT 5 /* count of syscall0 functions*/
-#ifdef __KERNEL__
-#include <linux/linkage.h>
-
-#define __syscall_return(type, res) return ((type)(res))
-
-/* Tensilica's xt-xcc compiler is much more agressive at code
- * optimization than gcc. Multiple __asm__ statements are
- * insufficient for xt-xcc because subsequent optimization passes
- * (beyond the front-end that knows of __asm__ statements and other
- * such GNU Extensions to C) can modify the register selection for
- * containment of C variables.
- *
- * xt-xcc cannot modify the contents of a single __asm__ statement, so
- * we create single-asm versions of the syscall macros that are
- * suitable and optimal for both xt-xcc and gcc.
- *
- * Linux takes system-call arguments in registers. The following
- * design is optimized for user-land apps (e.g., glibc) which
- * typically have a function wrapper around the "syscall" assembly
- * instruction. It satisfies the Xtensa ABI while minizing argument
- * shifting.
- *
- * The Xtensa ABI and software conventions require the system-call
- * number in a2. If an argument exists in a2, we move it to the next
- * available register. Note that for improved efficiency, we do NOT
- * shift all parameters down one register to maintain the original
- * order.
- *
- * At best case (zero arguments), we just write the syscall number to
- * a2. At worst case (1 to 6 arguments), we move the argument in a2
- * to the next available register, then write the syscall number to
- * a2.
- *
- * For clarity, the following truth table enumerates all possibilities.
- *
- * arguments syscall number arg0, arg1, arg2, arg3, arg4, arg5
- * --------- -------------- ----------------------------------
- * 0 a2
- * 1 a2 a3
- * 2 a2 a4, a3
- * 3 a2 a5, a3, a4
- * 4 a2 a6, a3, a4, a5
- * 5 a2 a7, a3, a4, a5, a6
- * 6 a2 a8, a3, a4, a5, a6, a7
- */
-
-#define _syscall0(type,name) \
-type name(void) \
-{ \
-long __res; \
-__asm__ __volatile__ ( \
- " movi a2, %1 \n" \
- " syscall \n" \
- " mov %0, a2 \n" \
- : "=a" (__res) \
- : "i" (__NR_##name) \
- : "a2" \
- ); \
-__syscall_return(type,__res); \
-}
-
-#define _syscall1(type,name,type0,arg0) \
-type name(type0 arg0) \
-{ \
-long __res; \
-__asm__ __volatile__ ( \
- " mov a3, %2 \n" \
- " movi a2, %1 \n" \
- " syscall \n" \
- " mov %0, a2 \n" \
- : "=a" (__res) \
- : "i" (__NR_##name), "a" (arg0) \
- : "a2", "a3" \
- ); \
-__syscall_return(type,__res); \
-}
-
-#define _syscall2(type,name,type0,arg0,type1,arg1) \
-type name(type0 arg0,type1 arg1) \
-{ \
-long __res; \
-__asm__ __volatile__ ( \
- " mov a4, %2 \n" \
- " mov a3, %3 \n" \
- " movi a2, %1 \n" \
- " syscall \n" \
- " mov %0, a2 \n" \
- : "=a" (__res) \
- : "i" (__NR_##name), "a" (arg0), "a" (arg1) \
- : "a2", "a3", "a4" \
- ); \
-__syscall_return(type,__res); \
-}
-
-#define _syscall3(type,name,type0,arg0,type1,arg1,type2,arg2) \
-type name(type0 arg0,type1 arg1,type2 arg2) \
-{ \
-long __res; \
-__asm__ __volatile__ ( \
- " mov a5, %2 \n" \
- " mov a4, %4 \n" \
- " mov a3, %3 \n" \
- " movi a2, %1 \n" \
- " syscall \n" \
- " mov %0, a2 \n" \
- : "=a" (__res) \
- : "i" (__NR_##name), "a" (arg0), "a" (arg1), "a" (arg2) \
- : "a2", "a3", "a4", "a5" \
- ); \
-__syscall_return(type,__res); \
-}
-
-#define _syscall4(type,name,type0,arg0,type1,arg1,type2,arg2,type3,arg3) \
-type name(type0 arg0,type1 arg1,type2 arg2,type3 arg3) \
-{ \
-long __res; \
-__asm__ __volatile__ ( \
- " mov a6, %2 \n" \
- " mov a5, %5 \n" \
- " mov a4, %4 \n" \
- " mov a3, %3 \n" \
- " movi a2, %1 \n" \
- " syscall \n" \
- " mov %0, a2 \n" \
- : "=a" (__res) \
- : "i" (__NR_##name), "a" (arg0), "a" (arg1), "a" (arg2), "a" (arg3) \
- : "a2", "a3", "a4", "a5", "a6" \
- ); \
-__syscall_return(type,__res); \
-}
-
-/* Note that we save and restore the a7 frame pointer.
- * Including a7 in the clobber list doesn't do what you'd expect.
- */
-#define _syscall5(type,name,type0,arg0,type1,arg1,type2,arg2,type3,arg3,type4,arg4) \
-type name(type0 arg0,type1 arg1,type2 arg2,type3 arg3,type4 arg4) \
-{ \
-long __res; \
-__asm__ __volatile__ ( \
- " mov a9, a7 \n" \
- " mov a7, %2 \n" \
- " mov a6, %6 \n" \
- " mov a5, %5 \n" \
- " mov a4, %4 \n" \
- " mov a3, %3 \n" \
- " movi a2, %1 \n" \
- " syscall \n" \
- " mov a7, a9 \n" \
- " mov %0, a2 \n" \
- : "=a" (__res) \
- : "i" (__NR_##name), "a" (arg0), "a" (arg1), "a" (arg2), \
- "a" (arg3), "a" (arg4) \
- : "a2", "a3", "a4", "a5", "a6", "a9" \
- ); \
-__syscall_return(type,__res); \
-}
-
-/* Note that we save and restore the a7 frame pointer.
- * Including a7 in the clobber list doesn't do what you'd expect.
- */
-#define _syscall6(type,name,type0,arg0,type1,arg1,type2,arg2,type3,arg3,type4,arg4,type5,arg5) \
-type name(type0 arg0,type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5) \
-{ \
-long __res; \
-__asm__ __volatile__ ( \
- " mov a9, a7 \n" \
- " mov a8, %2 \n" \
- " mov a7, %7 \n" \
- " mov a6, %6 \n" \
- " mov a5, %5 \n" \
- " mov a4, %4 \n" \
- " mov a3, %3 \n" \
- " movi a2, %1 \n" \
- " syscall \n" \
- " mov a7, a9 \n" \
- " mov %0, a2 \n" \
- : "=a" (__res) \
- : "i" (__NR_##name), "a" (arg0), "a" (arg1), "a" (arg2), \
- "a" (arg3), "a" (arg4), "a" (arg5) \
- : "a2", "a3", "a4", "a5", "a6", "a8", "a9" \
- ); \
-__syscall_return(type,__res); \
-}
-
/*
* "Conditional" syscalls
*
projects / linux-2.6 / blobdiff