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>

/* 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 INLINE_SYSCALL
# define INLINE_SYSCALL(name, 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");					\
    long ret, err;							\
    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;								\
    ret = r3;								\
    if (__builtin_expect (err & (1 << 28), 0))				\
      {									\
	__set_errno (ret);						\
	ret = -1L;							\
      }									\
    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. This returns just what the kernel
   gave back in the non-error (CR0.SO cleared) case, otherwise (CR0.SO set)
   the negation of the return value in the kernel gets reverted.  */

# undef INTERNAL_SYSCALL
# define INTERNAL_SYSCALL(name, 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"								\
       "bns+	0f\n\t"							\
       "neg	%1,%1\n"						\
       "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");					\
    (int) r3;								\
  })
  
# undef INTERNAL_SYSCALL_ERROR_P
# define INTERNAL_SYSCALL_ERROR_P(val)   ((unsigned long) (val) >= 0xfffff001u)
  
# undef INTERNAL_SYSCALL_ERRNO
# define INTERNAL_SYSCALL_ERRNO(val)     (-(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/sysdep.h */