l4/pkg/l4re-core/uclibc/lib/contrib/uclibc/libc/sysdeps/linux/powerpc/powerpc32/sysdep.h

   1 /* Assembly macros for 32-bit PowerPC.
   2    Copyright (C) 1999, 2001, 2002, 2003, 2006 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifdef __ASSEMBLER__
  20
  21 #ifdef __ELF__
  22
  23 /* If compiled for profiling, call `_mcount' at the start of each
  24    function.  */
  25 #ifdef  PROF
  26 /* The mcount code relies on a the return address being on the stack
  27    to locate our caller and so it can restore it; so store one just
  28    for its benefit.  */
  29 # define CALL_MCOUNT                                                          \
  30   mflr  r0;                                                                   \
  31   stw   r0,4(r1);                                                             \
  32   cfi_offset (lr, 4);                                                         \
  33   bl    JUMPTARGET(_mcount);
  34 #else  /* PROF */
  35 # define CALL_MCOUNT            /* Do nothing.  */
  36 #endif /* PROF */
  37
  38 #define ENTRY(name)                                                           \
  39   ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);                                   \
  40   ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)                          \
  41   .align ALIGNARG(2);                                                         \
  42   C_LABEL(name)                                                               \
  43   cfi_startproc;                                                              \
  44   CALL_MCOUNT
  45
  46 #define EALIGN_W_0  /* No words to insert.  */
  47 #define EALIGN_W_1  nop
  48 #define EALIGN_W_2  nop;nop
  49 #define EALIGN_W_3  nop;nop;nop
  50 #define EALIGN_W_4  EALIGN_W_3;nop
  51 #define EALIGN_W_5  EALIGN_W_4;nop
  52 #define EALIGN_W_6  EALIGN_W_5;nop
  53 #define EALIGN_W_7  EALIGN_W_6;nop
  54
  55 /* EALIGN is like ENTRY, but does alignment to 'words'*4 bytes
  56    past a 2^align boundary.  */
  57 #ifdef PROF
  58 # define EALIGN(name, alignt, words)                                          \
  59   ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);                                   \
  60   ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)                          \
  61   .align ALIGNARG(2);                                                         \
  62   C_LABEL(name)                                                               \
  63   cfi_startproc;                                                              \
  64   CALL_MCOUNT                                                                 \
  65   b 0f;                                                                       \
  66   .align ALIGNARG(alignt);                                                    \
  67   EALIGN_W_##words;                                                           \
  68   0:
  69 #else /* PROF */
  70 # define EALIGN(name, alignt, words)                                          \
  71   ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);                                   \
  72   ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)                          \
  73   .align ALIGNARG(alignt);                                                    \
  74   EALIGN_W_##words;                                                           \
  75   C_LABEL(name)                                                               \
  76   cfi_startproc;
  77 #endif
  78
  79 #undef  END
  80 #define END(name)                                                             \
  81   cfi_endproc;                                                                \
  82   ASM_SIZE_DIRECTIVE(name)
  83
  84 #define DO_CALL(syscall)                                                      \
  85     li 0,syscall;                                                             \
  86     sc
  87
  88 #undef JUMPTARGET
  89 #ifdef PIC
  90 # define JUMPTARGET(name) name##@plt
  91 #else
  92 # define JUMPTARGET(name) name
  93 #endif
  94
  95 #if defined SHARED && defined DO_VERSIONING && defined PIC \
  96     && !defined NO_HIDDEN
  97 # undef HIDDEN_JUMPTARGET
  98 # define HIDDEN_JUMPTARGET(name) __GI_##name##@local
  99 #endif
 100
 101 #define PSEUDO(name, syscall_name, args)                                      \
 102   .section ".text";                                                           \
 103   ENTRY (name)                                                                \
 104     DO_CALL (SYS_ify (syscall_name));
 105
 106 #define PSEUDO_RET                                                            \
 107     bnslr+;                                                                   \
 108     b __syscall_error@local
 109 #define ret PSEUDO_RET
 110
 111 #undef  PSEUDO_END
 112 #define PSEUDO_END(name)                                                      \
 113   END (name)
 114
 115 #define PSEUDO_NOERRNO(name, syscall_name, args)                              \
 116   .section ".text";                                                           \
 117   ENTRY (name)                                                                \
 118     DO_CALL (SYS_ify (syscall_name));
 119
 120 #define PSEUDO_RET_NOERRNO                                                    \
 121     blr
 122 #define ret_NOERRNO PSEUDO_RET_NOERRNO
 123
 124 #undef  PSEUDO_END_NOERRNO
 125 #define PSEUDO_END_NOERRNO(name)                                              \
 126   END (name)
 127
 128 #define PSEUDO_ERRVAL(name, syscall_name, args)                               \
 129   .section ".text";                                                           \
 130   ENTRY (name)                                                                \
 131     DO_CALL (SYS_ify (syscall_name));
 132
 133 #define PSEUDO_RET_ERRVAL                                                     \
 134     blr
 135 #undef ret_ERRVAL
 136 #define ret_ERRVAL PSEUDO_RET_ERRVAL
 137
 138 #undef  PSEUDO_END_ERRVAL
 139 #define PSEUDO_END_ERRVAL(name)                                               \
 140   END (name)
 141
 142 /* Local labels stripped out by the linker.  */
 143 #undef L
 144 #define L(x) .L##x
 145
 146 /* Label in text section.  */
 147 #define C_TEXT(name) name
 148
 149 #endif /* __ELF__ */
 150
 151 #endif  /* __ASSEMBLER__ */