File: sysdep.h

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/* Copyright (C) 1992-2018 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, see
   <http://www.gnu.org/licenses/>.  */

/* Alan Modra <amodra@bigpond.net.au> rewrote the INLINE_SYSCALL macro */

#ifndef _LINUX_POWERPC_SYSDEP_H
#define _LINUX_POWERPC_SYSDEP_H 1

#include <sysdeps/unix/sysv/linux/sysdep.h>
#include <sysdeps/unix/powerpc/sysdep.h>
#include <tls.h>

/* Define __set_errno() for INLINE_SYSCALL macro below.  */
#ifndef __ASSEMBLER__
#include <errno.h>
#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
#define SYS_ify(syscall_name)	__NR_##syscall_name

#ifdef __ASSEMBLER__

/* This seems to always be the case on PPC.  */
# define ALIGNARG(log2) log2
# define ASM_SIZE_DIRECTIVE(name) .size name,.-name

#endif /* __ASSEMBLER__ */

/* This version is for internal uses when there is no desire
   to set errno */
#define INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK(name, err, type, nr, args...)   \
  ({									      \
    type sc_ret = ENOSYS;						      \
									      \
    __typeof (__vdso_##name) vdsop = __vdso_##name;			      \
    PTR_DEMANGLE (vdsop);						      \
    if (vdsop != NULL)							      \
      sc_ret =								      \
        INTERNAL_VSYSCALL_CALL_TYPE (vdsop, err, type, nr, ##args);	      \
    else								      \
      err = 1 << 28;							      \
    sc_ret;								      \
  })

/* List of system calls which are supported as vsyscalls.  */
#define HAVE_CLOCK_GETRES_VSYSCALL	1
#define HAVE_CLOCK_GETTIME_VSYSCALL	1
#define HAVE_GETCPU_VSYSCALL		1

/* 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.  */

#define INTERNAL_VSYSCALL_CALL_TYPE(funcptr, err, type, nr, args...)    \
  ({									\
    register void *r0  __asm__ ("r0");					\
    register long int r3  __asm__ ("r3");				\
    register long int r4  __asm__ ("r4");				\
    register long int r5  __asm__ ("r5");				\
    register long int r6  __asm__ ("r6");				\
    register long int r7  __asm__ ("r7");				\
    register long int r8  __asm__ ("r8");				\
    register type rval  __asm__ ("r3");				        \
    LOADARGS_##nr (funcptr, args);					\
    __asm__ __volatile__						\
      ("mtctr %0\n\t"							\
       "bctrl\n\t"							\
       "mfcr  %0\n\t"							\
       "0:"								\
       : "+r" (r0), "+r" (r3), "+r" (r4), "+r" (r5),  "+r" (r6),        \
         "+r" (r7), "+r" (r8)						\
       : : "r9", "r10", "r11", "r12", "cr0", "ctr", "lr", "memory");	\
    err = (long int) r0;						\
    __asm__ __volatile__ ("" : "=r" (rval) : "r" (r3));		        \
    rval;								\
  })

#define INTERNAL_VSYSCALL_CALL(funcptr, err, nr, args...)		\
  INTERNAL_VSYSCALL_CALL_TYPE(funcptr, err, long int, nr, args)

#undef INLINE_SYSCALL

/* This version is for kernels that implement system calls that
   behave like function calls as far as register saving.  */
#define INLINE_SYSCALL(name, nr, args...)				\
  ({									\
    INTERNAL_SYSCALL_DECL (sc_err);					\
    long int 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. 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_NCS(name, err, nr, args...) \
  ({									\
    register long int r0  __asm__ ("r0");				\
    register long int r3  __asm__ ("r3");				\
    register long int r4  __asm__ ("r4");				\
    register long int r5  __asm__ ("r5");				\
    register long int r6  __asm__ ("r6");				\
    register long int r7  __asm__ ("r7");				\
    register long int r8  __asm__ ("r8");				\
    LOADARGS_##nr (name, ##args);					\
    __asm__ __volatile__						\
      ("sc\n\t"								\
       "mfcr  %0\n\t"							\
       "0:"								\
       : "=&r" (r0),							\
         "=&r" (r3), "=&r" (r4), "=&r" (r5),				\
         "=&r" (r6), "=&r" (r7), "=&r" (r8)				\
       : ASM_INPUT_##nr							\
       : "r9", "r10", "r11", "r12",					\
         "cr0", "ctr", "memory");					\
	  err = r0;  \
    r3;  \
  })
#define INTERNAL_SYSCALL(name, err, nr, args...)			\
  INTERNAL_SYSCALL_NCS (__NR_##name, err, nr, args)

#undef INTERNAL_SYSCALL_DECL
#define INTERNAL_SYSCALL_DECL(err) long int err __attribute__ ((unused))

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

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

#define LOADARGS_0(name, dummy) \
	r0 = name
#define LOADARGS_1(name, __arg1) \
	long int arg1 = (long int) (__arg1); \
	LOADARGS_0(name, 0); \
	extern void __illegally_sized_syscall_arg1 (void); \
	if (__builtin_classify_type (__arg1) != 5 && sizeof (__arg1) > 8) \
	  __illegally_sized_syscall_arg1 (); \
	r3 = arg1
#define LOADARGS_2(name, __arg1, __arg2) \
	long int arg2 = (long int) (__arg2); \
	LOADARGS_1(name, __arg1); \
	extern void __illegally_sized_syscall_arg2 (void); \
	if (__builtin_classify_type (__arg2) != 5 && sizeof (__arg2) > 8) \
	  __illegally_sized_syscall_arg2 (); \
	r4 = arg2
#define LOADARGS_3(name, __arg1, __arg2, __arg3) \
	long int arg3 = (long int) (__arg3); \
	LOADARGS_2(name, __arg1, __arg2); \
	extern void __illegally_sized_syscall_arg3 (void); \
	if (__builtin_classify_type (__arg3) != 5 && sizeof (__arg3) > 8) \
	  __illegally_sized_syscall_arg3 (); \
	r5 = arg3
#define LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4) \
	long int arg4 = (long int) (__arg4); \
	LOADARGS_3(name, __arg1, __arg2, __arg3); \
	extern void __illegally_sized_syscall_arg4 (void); \
	if (__builtin_classify_type (__arg4) != 5 && sizeof (__arg4) > 8) \
	  __illegally_sized_syscall_arg4 (); \
	r6 = arg4
#define LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5) \
	long int arg5 = (long int) (__arg5); \
	LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4); \
	extern void __illegally_sized_syscall_arg5 (void); \
	if (__builtin_classify_type (__arg5) != 5 && sizeof (__arg5) > 8) \
	  __illegally_sized_syscall_arg5 (); \
	r7 = arg5
#define LOADARGS_6(name, __arg1, __arg2, __arg3, __arg4, __arg5, __arg6) \
	long int arg6 = (long int) (__arg6); \
	LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5); \
	extern void __illegally_sized_syscall_arg6 (void); \
	if (__builtin_classify_type (__arg6) != 5 && sizeof (__arg6) > 8) \
	  __illegally_sized_syscall_arg6 (); \
	r8 = 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)


/* Pointer mangling support.  */
#if IS_IN (rtld)
/* We cannot use the thread descriptor because in ld.so we use setjmp
   earlier than the descriptor is initialized.  */
#else
# ifdef __ASSEMBLER__
#  define PTR_MANGLE(reg, tmpreg) \
	ld	tmpreg,POINTER_GUARD(r13); \
	xor	reg,tmpreg,reg
#  define PTR_MANGLE2(reg, tmpreg) \
	xor	reg,tmpreg,reg
#  define PTR_MANGLE3(destreg, reg, tmpreg) \
	ld	tmpreg,POINTER_GUARD(r13); \
	xor	destreg,tmpreg,reg
#  define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
#  define PTR_DEMANGLE2(reg, tmpreg) PTR_MANGLE2 (reg, tmpreg)
#  define PTR_DEMANGLE3(destreg, reg, tmpreg) PTR_MANGLE3 (destreg, reg, tmpreg)
# else
#  define PTR_MANGLE(var) \
  (var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
#  define PTR_DEMANGLE(var)	PTR_MANGLE (var)
# endif
#endif

/* In the PowerPC64 ABI, the unadorned F_GETLK* opcodes should be used
   even by largefile64 code.  */
#define FCNTL_ADJUST_CMD(__cmd)				\
  ({ int cmd_ = (__cmd);				\
     if (cmd_ >= F_GETLK64 && cmd_ <= F_SETLKW64)	\
       cmd_ -= F_GETLK64 - F_GETLK;			\
     cmd_; })


#endif /* linux/powerpc/powerpc64/sysdep.h */