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170 lines
6.0 KiB
C
170 lines
6.0 KiB
C
/* Copyright (C) 1992, 1997, 1998, 1999, 2000, 2001, 2002, 2003
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Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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/* Alan Modra <amodra@bigpond.net.au> rewrote the INLINE_SYSCALL macro */
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#ifndef _LINUX_POWERPC_SYSDEP_H
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#define _LINUX_POWERPC_SYSDEP_H 1
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#include <sysdeps/unix/powerpc/sysdep.h>
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/* Define __set_errno() for INLINE_SYSCALL macro below. */
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#ifndef __ASSEMBLER__
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#include <errno.h>
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#endif
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/* Some systen calls got renamed over time, but retained the same semantics.
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Handle them here so they can be catched by both C and assembler stubs in
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glibc. */
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#ifdef __NR_pread64
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# ifdef __NR_pread
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# error "__NR_pread and __NR_pread64 both defined???"
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# endif
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# define __NR_pread __NR_pread64
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#endif
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#ifdef __NR_pwrite64
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# ifdef __NR_pwrite
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# error "__NR_pwrite and __NR_pwrite64 both defined???"
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# endif
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# define __NR_pwrite __NR_pwrite64
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#endif
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/* For Linux we can use the system call table in the header file
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/usr/include/asm/unistd.h
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of the kernel. But these symbols do not follow the SYS_* syntax
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so we have to redefine the `SYS_ify' macro here. */
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#undef SYS_ify
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#ifdef __STDC__
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# define SYS_ify(syscall_name) __NR_##syscall_name
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#else
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# define SYS_ify(syscall_name) __NR_/**/syscall_name
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#endif
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#ifdef __ASSEMBLER__
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/* This seems to always be the case on PPC. */
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#define ALIGNARG(log2) log2
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/* For ELF we need the `.type' directive to make shared libs work right. */
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#define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg;
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#define ASM_SIZE_DIRECTIVE(name) .size name,.-name
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#endif /* __ASSEMBLER__ */
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#undef INLINE_SYSCALL
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/* This version is for kernels that implement system calls that
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behave like function calls as far as register saving. */
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#define INLINE_SYSCALL(name, nr, args...) \
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({ \
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INTERNAL_SYSCALL_DECL (sc_err); \
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long sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, args); \
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if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err)) \
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{ \
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__set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err)); \
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sc_ret = -1L; \
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} \
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sc_ret; \
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})
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/* Define a macro which expands inline into the wrapper code for a system
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call. This use is for internal calls that do not need to handle errors
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normally. It will never touch errno. This returns just what the kernel
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gave back in the non-error (CR0.SO cleared) case, otherwise (CR0.SO set)
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the negation of the return value in the kernel gets reverted. */
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#undef INTERNAL_SYSCALL
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#define INTERNAL_SYSCALL(name, err, nr, args...) \
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({ \
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register long r0 __asm__ ("r0"); \
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register long r3 __asm__ ("r3"); \
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register long r4 __asm__ ("r4"); \
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register long r5 __asm__ ("r5"); \
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register long r6 __asm__ ("r6"); \
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register long r7 __asm__ ("r7"); \
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register long r8 __asm__ ("r8"); \
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LOADARGS_##nr(name, args); \
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__asm__ __volatile__ \
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("sc\n\t" \
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"mfcr %0\n\t" \
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"0:" \
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: "=&r" (r0), \
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"=&r" (r3), "=&r" (r4), "=&r" (r5), \
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"=&r" (r6), "=&r" (r7), "=&r" (r8) \
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: ASM_INPUT_##nr \
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: "r9", "r10", "r11", "r12", \
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"cr0", "ctr", "memory"); \
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err = r0; \
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(int) r3; \
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})
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#undef INTERNAL_SYSCALL_DECL
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#define INTERNAL_SYSCALL_DECL(err) long err
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#undef INTERNAL_SYSCALL_ERROR_P
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#define INTERNAL_SYSCALL_ERROR_P(val, err) \
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(__builtin_expect (err & (1 << 28), 0))
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#undef INTERNAL_SYSCALL_ERRNO
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#define INTERNAL_SYSCALL_ERRNO(val, err) (val)
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#define LOADARGS_0(name, dummy) \
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r0 = __NR_##name
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#define LOADARGS_1(name, arg1) \
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LOADARGS_0(name, 0); \
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extern void __illegally_sized_syscall_##name##_arg1 (void); \
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if (sizeof (arg1) > 8) __illegally_sized_syscall_##name##_arg1 (); \
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r3 = (long) (arg1)
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#define LOADARGS_2(name, arg1, arg2) \
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LOADARGS_1(name, arg1); \
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extern void __illegally_sized_syscall_##name##_arg2 (void); \
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if (sizeof (arg2) > 8) __illegally_sized_syscall_##name##_arg2 (); \
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r4 = (long) (arg2)
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#define LOADARGS_3(name, arg1, arg2, arg3) \
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LOADARGS_2(name, arg1, arg2); \
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extern void __illegally_sized_syscall_##name##_arg3 (void); \
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if (sizeof (arg3) > 8) __illegally_sized_syscall_##name##_arg3 (); \
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r5 = (long) (arg3)
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#define LOADARGS_4(name, arg1, arg2, arg3, arg4) \
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LOADARGS_3(name, arg1, arg2, arg3); \
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extern void __illegally_sized_syscall_##name##_arg4 (void); \
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if (sizeof (arg4) > 8) __illegally_sized_syscall_##name##_arg4 (); \
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r6 = (long) (arg4)
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#define LOADARGS_5(name, arg1, arg2, arg3, arg4, arg5) \
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LOADARGS_4(name, arg1, arg2, arg3, arg4); \
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extern void __illegally_sized_syscall_##name##_arg5 (void); \
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if (sizeof (arg5) > 8) __illegally_sized_syscall_##name##_arg5 (); \
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r7 = (long) (arg5)
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#define LOADARGS_6(name, arg1, arg2, arg3, arg4, arg5, arg6) \
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LOADARGS_5(name, arg1, arg2, arg3, arg4, arg5); \
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extern void __illegally_sized_syscall_##name##_arg6 (void); \
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if (sizeof (arg6) > 8) __illegally_sized_syscall_##name##_arg6 (); \
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r8 = (long) (arg6)
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#define ASM_INPUT_0 "0" (r0)
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#define ASM_INPUT_1 ASM_INPUT_0, "1" (r3)
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#define ASM_INPUT_2 ASM_INPUT_1, "2" (r4)
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#define ASM_INPUT_3 ASM_INPUT_2, "3" (r5)
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#define ASM_INPUT_4 ASM_INPUT_3, "4" (r6)
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#define ASM_INPUT_5 ASM_INPUT_4, "5" (r7)
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#define ASM_INPUT_6 ASM_INPUT_5, "6" (r8)
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#endif /* linux/powerpc/powerpc64/sysdep.h */
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