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sysdep.h

/* Copyright (C) 1992, 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2003 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>, August 1995.
   Changed by Kaz Kojima, <kkojima@rr.iij4u.or.jp>.

   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_SH_SYSDEP_H
#define _LINUX_SH_SYSDEP_H 1

/* There is some commonality.  */
#include <sysdeps/unix/sh/sysdep.h>

/* 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__

/* Linux uses a negative return value to indicate syscall errors,
   unlike most Unices, which use the condition codes' carry flag.

   Since version 2.1 the return value of a system call might be
   negative even if the call succeeded.  E.g., the `lseek' system call
   might return a large offset.  Therefore we must not anymore test
   for < 0, but test for a real error by making sure the value in R0
   is a real error number.  Linus said he will make sure the no syscall
   returns a value in -1 .. -4095 as a valid result so we can savely
   test with -4095.  */

#define _IMM1 #-1
#define _IMM12 #-12
#undef      PSEUDO
#define     PSEUDO(name, syscall_name, args) \
 .text; \
 ENTRY (name); \
    DO_CALL (syscall_name, args); \
    mov r0,r1; \
    mov _IMM12,r2; \
    shad r2,r1; \
    not r1,r1; \
    tst r1,r1; \
    bf .Lpseudo_end; \
    SYSCALL_ERROR_HANDLER; \
 .Lpseudo_end:

#undef      PSEUDO_END
#define     PSEUDO_END(name) \
  END (name)

#ifndef PIC
# define SYSCALL_ERROR_HANDLER      \
      mov.l 0f,r1; \
      jmp @r1; \
       mov r0,r4; \
      .align 2; \
     0: .long __syscall_error
#else
# if RTLD_PRIVATE_ERRNO
#  define SYSCALL_ERROR_HANDLER     \
      neg r0,r1; \
      mov.l 0f,r12; \
      mova 0f,r0; \
      add r0,r12; \
      mov.l 1f,r0; \
      mov.l r1,@(r0,r12)
      bra .Lpseudo_end; \
       mov _IMM1,r0; \
      .align 2; \
     0: .long _GLOBAL_OFFSET_TABLE_; \
     1: .long errno@GOTOFF

# elif defined _LIBC_REENTRANT

#  if USE___THREAD
#   ifndef NOT_IN_libc
#    define SYSCALL_ERROR_ERRNO __libc_errno
#   else
#    define SYSCALL_ERROR_ERRNO errno
#   endif
#   define SYSCALL_ERROR_HANDLER \
      neg r0,r1; \
      mov r12,r2; \
      mov.l 0f,r12; \
      mova 0f,r0; \
      add r0,r12; \
      mov.l 1f,r0; \
      stc gbr, r4; \
      mov.l @(r0,r12),r0; \
      mov r2,r12; \
      add r4,r0; \
      mov.l r1,@r0; \
      bra .Lpseudo_end; \
       mov _IMM1,r0; \
      .align 2; \
     0: .long _GLOBAL_OFFSET_TABLE_; \
     1: .long SYSCALL_ERROR_ERRNO@GOTTPOFF
#  else
#   define SYSCALL_ERROR_HANDLER \
      neg r0,r1; \
      mov.l r14,@-r15; \
      mov.l r12,@-r15; \
      mov.l r1,@-r15; \
      mov.l 0f,r12; \
      mova 0f,r0; \
      add r0,r12; \
      sts.l pr,@-r15; \
      mov r15,r14; \
      mov.l 1f,r1; \
      bsrf r1; \
         nop; \
     2: mov r14,r15; \
      lds.l @r15+,pr; \
      mov.l @r15+,r1; \
      mov.l r1,@r0; \
      mov.l @r15+,r12; \
      mov.l @r15+,r14; \
      bra .Lpseudo_end; \
       mov _IMM1,r0; \
      .align 2; \
     0: .long _GLOBAL_OFFSET_TABLE_; \
     1: .long PLTJMP(C_SYMBOL_NAME(__errno_location))-(2b+2-.)
/* A quick note: it is assumed that the call to `__errno_location' does
   not modify the stack!  */
#  endif
# else
/* Store (-r0) into errno through the GOT.  */
#  define SYSCALL_ERROR_HANDLER                                         \
      neg r0,r1; \
      mov r12,r2; \
      mov.l 0f,r12; \
      mova 0f,r0; \
      add r0,r12; \
      mov.l 1f,r0; \
      mov.l @(r0,r12),r0; \
      mov r2,r12; \
      mov.l r1,@r0; \
      bra .Lpseudo_end; \
       mov _IMM1,r0; \
      .align 2; \
     0: .long _GLOBAL_OFFSET_TABLE_; \
     1: .long errno@GOT
# endif     /* _LIBC_REENTRANT */
#endif      /* PIC */

#define SYSCALL_INST0   trapa #0x10
#define SYSCALL_INST1   trapa #0x11
#define SYSCALL_INST2   trapa #0x12
#define SYSCALL_INST3   trapa #0x13
#define SYSCALL_INST4   trapa #0x14
#define SYSCALL_INST5   mov.l @(0,r15),r0; trapa #0x15
#define SYSCALL_INST6   mov.l @(0,r15),r0; mov.l @(4,r15),r1; trapa #0x16

#undef      DO_CALL
#define DO_CALL(syscall_name, args) \
    mov.l 1f,r3;              \
    SYSCALL_INST##args;             \
    bra 2f;                   \
     nop;                     \
    .align 2;                       \
 1: .long SYS_ify (syscall_name);   \
 2:

# ifdef NEED_SYSCALL_INST_PAD
#  define SYSCALL_INST_PAD \
      or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0
# else
#  define SYSCALL_INST_PAD
# endif

#else /* not __ASSEMBLER__ */

#define SYSCALL_INST_STR0     "trapa #0x10\n\t"
#define SYSCALL_INST_STR1     "trapa #0x11\n\t"
#define SYSCALL_INST_STR2     "trapa #0x12\n\t"
#define SYSCALL_INST_STR3     "trapa #0x13\n\t"
#define SYSCALL_INST_STR4     "trapa #0x14\n\t"
#define SYSCALL_INST_STR5     "trapa #0x15\n\t"
#define SYSCALL_INST_STR6     "trapa #0x16\n\t"

# ifdef NEED_SYSCALL_INST_PAD
#  define SYSCALL_INST_PAD "\
      or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0"
# else
#  define SYSCALL_INST_PAD
# endif

#define ASMFMT_0
#define ASMFMT_1 \
      , "r" (r4)
#define ASMFMT_2 \
      , "r" (r4), "r" (r5)
#define ASMFMT_3 \
      , "r" (r4), "r" (r5), "r" (r6)
#define ASMFMT_4 \
      , "r" (r4), "r" (r5), "r" (r6), "r" (r7)
#define ASMFMT_5 \
      , "r" (r4), "r" (r5), "r" (r6), "r" (r7), "0" (r0)
#define ASMFMT_6 \
      , "r" (r4), "r" (r5), "r" (r6), "r" (r7), "0" (r0), "r" (r1)
#define ASMFMT_7 \
      , "r" (r4), "r" (r5), "r" (r6), "r" (r7), "0" (r0), "r" (r1), "r" (r2)

#define SUBSTITUTE_ARGS_0()
#define SUBSTITUTE_ARGS_1(arg1)                             \
      register long r4 asm ("%r4") = (long)(arg1)
#define SUBSTITUTE_ARGS_2(arg1, arg2)                       \
      register long r4 asm ("%r4") = (long)(arg1);          \
      register long r5 asm ("%r5") = (long)(arg2)
#define SUBSTITUTE_ARGS_3(arg1, arg2, arg3)                 \
      register long r4 asm ("%r4") = (long)(arg1);          \
      register long r5 asm ("%r5") = (long)(arg2);          \
      register long r6 asm ("%r6") = (long)(arg3)
#define SUBSTITUTE_ARGS_4(arg1, arg2, arg3, arg4)           \
      register long r4 asm ("%r4") = (long)(arg1);          \
      register long r5 asm ("%r5") = (long)(arg2);          \
      register long r6 asm ("%r6") = (long)(arg3);          \
      register long r7 asm ("%r7") = (long)(arg4)
#define SUBSTITUTE_ARGS_5(arg1, arg2, arg3, arg4, arg5)     \
      register long r4 asm ("%r4") = (long)(arg1);          \
      register long r5 asm ("%r5") = (long)(arg2);          \
      register long r6 asm ("%r6") = (long)(arg3);          \
      register long r7 asm ("%r7") = (long)(arg4);          \
      register long r0 asm ("%r0") = (long)(arg5)
#define SUBSTITUTE_ARGS_6(arg1, arg2, arg3, arg4, arg5, arg6)           \
      register long r4 asm ("%r4") = (long)(arg1);                \
      register long r5 asm ("%r5") = (long)(arg2);                \
      register long r6 asm ("%r6") = (long)(arg3);                \
      register long r7 asm ("%r7") = (long)(arg4);                \
      register long r0 asm ("%r0") = (long)(arg5);                \
      register long r1 asm ("%r1") = (long)(arg6)
#define SUBSTITUTE_ARGS_7(arg1, arg2, arg3, arg4, arg5, arg6, arg7)     \
      register long r4 asm ("%r4") = (long)(arg1);                \
      register long r5 asm ("%r5") = (long)(arg2);                \
      register long r6 asm ("%r6") = (long)(arg3);                \
      register long r7 asm ("%r7") = (long)(arg4);                \
      register long r0 asm ("%r0") = (long)(arg5)                 \
      register long r1 asm ("%r1") = (long)(arg6);                \
      register long r2 asm ("%r2") = (long)(arg7)

#undef INLINE_SYSCALL
#define INLINE_SYSCALL(name, nr, args...) \
  ({                                                                          \
    unsigned int resultvar = INTERNAL_SYSCALL (name, , nr, args);             \
    if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (resultvar, ), 0))         \
      {                                                                       \
        __set_errno (INTERNAL_SYSCALL_ERRNO (resultvar, ));                   \
        resultvar = 0xffffffff;                                               \
      }                                                                       \
    (int) resultvar; })

#undef INTERNAL_SYSCALL
#define INTERNAL_SYSCALL(name, err, nr, args...) \
  ({                                            \
    unsigned long resultvar;                          \
    register long r3 asm ("%r3") = SYS_ify (name);          \
    SUBSTITUTE_ARGS_##nr(args);                             \
                                                \
    asm volatile (SYSCALL_INST_STR##nr SYSCALL_INST_PAD           \
              : "=z" (resultvar)                      \
              : "r" (r3) ASMFMT_##nr                  \
              : "memory");                            \
                                                \
    (int) resultvar; })

#undef INTERNAL_SYSCALL_DECL
#define INTERNAL_SYSCALL_DECL(err) do { } while (0)

#undef INTERNAL_SYSCALL_ERROR_P
#define INTERNAL_SYSCALL_ERROR_P(val, err) \
  ((unsigned int) (val) >= 0xfffff001u)

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

#endif      /* __ASSEMBLER__ */

#endif /* linux/sh/sysdep.h */

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