glibc/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h

/* Copyright (C) 1992,97,98,99,2000,01,02,03 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifndef _LINUX_POWERPC_SYSDEP_H
#define _LINUX_POWERPC_SYSDEP_H 1

#include <sysdeps/unix/powerpc/sysdep.h>

/* Some systen calls got renamed over time, but retained the same semantics.
   Handle them here so they can be catched by both C and assembler stubs in
   glibc.  */

#ifdef __NR_pread64
# ifdef __NR_pread
#  error "__NR_pread and __NR_pread64 both defined???"
# endif
# define __NR_pread __NR_pread64
#endif

#ifdef __NR_pwrite64
# ifdef __NR_pwrite
#  error "__NR_pwrite and __NR_pwrite64 both defined???"
# endif
# define __NR_pwrite __NR_pwrite64
#endif

/* For Linux we can use the system call table in the header file
	/usr/include/asm/unistd.h
   of the kernel.  But these symbols do not follow the SYS_* syntax
   so we have to redefine the `SYS_ify' macro here.  */
#undef SYS_ify
#ifdef __STDC__
# define SYS_ify(syscall_name)	__NR_##syscall_name
#else
# define SYS_ify(syscall_name)	__NR_/**/syscall_name
#endif

#ifndef __ASSEMBLER__

# include <errno.h>

# undef INLINE_SYSCALL
# define INLINE_SYSCALL(name, nr, args...)				\
  ({									\
    INTERNAL_SYSCALL_DECL (sc_err);					\
    long sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, args);		\
    if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err))			\
      {									\
	__set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err));		\
	sc_ret = -1L;							\
      }									\
    sc_ret;								\
  })

/* Define a macro which expands inline into the wrapper code for a system
   call. This use is for internal calls that do not need to handle errors
   normally. It will never touch errno.
   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).  */

# undef INTERNAL_SYSCALL_DECL
# define INTERNAL_SYSCALL_DECL(err) long err

# undef INTERNAL_SYSCALL
# define INTERNAL_SYSCALL(name, err, nr, args...)			\
  ({									\
    register long r0  __asm__ ("r0");					\
    register long r3  __asm__ ("r3");					\
    register long r4  __asm__ ("r4");					\
    register long r5  __asm__ ("r5");					\
    register long r6  __asm__ ("r6");					\
    register long r7  __asm__ ("r7");					\
    register long r8  __asm__ ("r8");					\
    register long r9  __asm__ ("r9");					\
    register long r10 __asm__ ("r10");					\
    register long r11 __asm__ ("r11");					\
    register long r12 __asm__ ("r12");					\
    LOADARGS_##nr(name, args);						\
    __asm__ __volatile__						\
      ("sc   \n\t"							\
       "mfcr %0"							\
       : "=&r" (r0),							\
	 "=&r" (r3), "=&r" (r4), "=&r" (r5),  "=&r" (r6),  "=&r" (r7),	\
	 "=&r" (r8), "=&r" (r9), "=&r" (r10), "=&r" (r11), "=&r" (r12)	\
       : ASM_INPUT_##nr							\
       : "cr0", "ctr", "memory");					\
    err = r0;								\
    (int) r3;								\
  })

# undef INTERNAL_SYSCALL_ERROR_P
# define INTERNAL_SYSCALL_ERROR_P(val, err) \
  (__builtin_expect (err & (1 << 28), 0))

# undef INTERNAL_SYSCALL_ERRNO
# define INTERNAL_SYSCALL_ERRNO(val, err)     (val)

# define LOADARGS_0(name, dummy) \
	r0 = __NR_##name
# define LOADARGS_1(name, arg1) \
	LOADARGS_0(name, 0); \
	extern void __illegally_sized_syscall_##name##_arg1 (void); \
	if (sizeof (arg1) > 4) __illegally_sized_syscall_##name##_arg1 (); \
	r3 = (long) (arg1)
# define LOADARGS_2(name, arg1, arg2) \
	LOADARGS_1(name, arg1); \
	extern void __illegally_sized_syscall_##name##_arg2 (void); \
	if (sizeof (arg2) > 4) __illegally_sized_syscall_##name##_arg2 (); \
	r4 = (long) (arg2)
# define LOADARGS_3(name, arg1, arg2, arg3) \
	LOADARGS_2(name, arg1, arg2); \
	extern void __illegally_sized_syscall_##name##_arg3 (void); \
	if (sizeof (arg3) > 4) __illegally_sized_syscall_##name##_arg3 (); \
	r5 = (long) (arg3)
# define LOADARGS_4(name, arg1, arg2, arg3, arg4) \
	LOADARGS_3(name, arg1, arg2, arg3); \
	extern void __illegally_sized_syscall_##name##_arg4 (void); \
	if (sizeof (arg4) > 4) __illegally_sized_syscall_##name##_arg4 (); \
	r6 = (long) (arg4)
# define LOADARGS_5(name, arg1, arg2, arg3, arg4, arg5) \
	LOADARGS_4(name, arg1, arg2, arg3, arg4); \
	extern void __illegally_sized_syscall_##name##_arg5 (void); \
	if (sizeof (arg5) > 4) __illegally_sized_syscall_##name##_arg5 (); \
	r7 = (long) (arg5)
# define LOADARGS_6(name, arg1, arg2, arg3, arg4, arg5, arg6) \
	LOADARGS_5(name, arg1, arg2, arg3, arg4, arg5); \
	extern void __illegally_sized_syscall_##name##_arg6 (void); \
	if (sizeof (arg6) > 4) __illegally_sized_syscall_##name##_arg6 (); \
	r8 = (long) (arg6)

# define ASM_INPUT_0 "0" (r0)
# define ASM_INPUT_1 ASM_INPUT_0, "1" (r3)
# define ASM_INPUT_2 ASM_INPUT_1, "2" (r4)
# define ASM_INPUT_3 ASM_INPUT_2, "3" (r5)
# define ASM_INPUT_4 ASM_INPUT_3, "4" (r6)
# define ASM_INPUT_5 ASM_INPUT_4, "5" (r7)
# define ASM_INPUT_6 ASM_INPUT_5, "6" (r8)

#endif /* __ASSEMBLER__ */


#endif /* linux/powerpc/powerpc32/sysdep.h */