l4/pkg/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, write to the Free
  17    Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA
  18    02110-1301 USA.  */
  19
  20 #ifdef __ASSEMBLER__
  21
  22 #ifdef __ELF__
  23
  24 /* If compiled for profiling, call `_mcount' at the start of each
  25    function.  */
  26 #ifdef  PROF
  27 /* The mcount code relies on a the return address being on the stack
  28    to locate our caller and so it can restore it; so store one just
  29    for its benefit.  */
  30 # define CALL_MCOUNT                                                          \
  31   mflr  r0;                                                                   \
  32   stw   r0,4(r1);                                                             \
  33   cfi_offset (lr, 4);                                                         \
  34   bl    JUMPTARGET(_mcount);
  35 #else  /* PROF */
  36 # define CALL_MCOUNT            /* Do nothing.  */
  37 #endif /* PROF */
  38
  39 #define ENTRY(name)                                                           \
  40   ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);                                   \
  41   ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)                          \
  42   .align ALIGNARG(2);                                                         \
  43   C_LABEL(name)                                                               \
  44   cfi_startproc;                                                              \
  45   CALL_MCOUNT
  46
  47 #define EALIGN_W_0  /* No words to insert.  */
  48 #define EALIGN_W_1  nop
  49 #define EALIGN_W_2  nop;nop
  50 #define EALIGN_W_3  nop;nop;nop
  51 #define EALIGN_W_4  EALIGN_W_3;nop
  52 #define EALIGN_W_5  EALIGN_W_4;nop
  53 #define EALIGN_W_6  EALIGN_W_5;nop
  54 #define EALIGN_W_7  EALIGN_W_6;nop
  55
  56 /* EALIGN is like ENTRY, but does alignment to 'words'*4 bytes
  57    past a 2^align boundary.  */
  58 #ifdef PROF
  59 # define EALIGN(name, alignt, words)                                          \
  60   ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);                                   \
  61   ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)                          \
  62   .align ALIGNARG(2);                                                         \
  63   C_LABEL(name)                                                               \
  64   cfi_startproc;                                                              \
  65   CALL_MCOUNT                                                                 \
  66   b 0f;                                                                       \
  67   .align ALIGNARG(alignt);                                                    \
  68   EALIGN_W_##words;                                                           \
  69   0:
  70 #else /* PROF */
  71 # define EALIGN(name, alignt, words)                                          \
  72   ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);                                   \
  73   ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)                          \
  74   .align ALIGNARG(alignt);                                                    \
  75   EALIGN_W_##words;                                                           \
  76   C_LABEL(name)                                                               \
  77   cfi_startproc;
  78 #endif
  79
  80 #undef  END
  81 #define END(name)                                                             \
  82   cfi_endproc;                                                                \
  83   ASM_SIZE_DIRECTIVE(name)
  84
  85 #define DO_CALL(syscall)                                                      \
  86     li 0,syscall;                                                             \
  87     sc
  88
  89 #undef JUMPTARGET
  90 #ifdef PIC
  91 # define JUMPTARGET(name) name##@plt
  92 #else
  93 # define JUMPTARGET(name) name
  94 #endif
  95
  96 #if defined SHARED && defined DO_VERSIONING && defined PIC \
  97     && !defined NO_HIDDEN
  98 # undef HIDDEN_JUMPTARGET
  99 # define HIDDEN_JUMPTARGET(name) __GI_##name##@local
 100 #endif
 101
 102 #define PSEUDO(name, syscall_name, args)                                      \
 103   .section ".text";                                                           \
 104   ENTRY (name)                                                                \
 105     DO_CALL (SYS_ify (syscall_name));
 106
 107 #define PSEUDO_RET                                                            \
 108     bnslr+;                                                                   \
 109     b __syscall_error@local
 110 #define ret PSEUDO_RET
 111
 112 #undef  PSEUDO_END
 113 #define PSEUDO_END(name)                                                      \
 114   END (name)
 115
 116 #define PSEUDO_NOERRNO(name, syscall_name, args)                              \
 117   .section ".text";                                                           \
 118   ENTRY (name)                                                                \
 119     DO_CALL (SYS_ify (syscall_name));
 120
 121 #define PSEUDO_RET_NOERRNO                                                    \
 122     blr
 123 #define ret_NOERRNO PSEUDO_RET_NOERRNO
 124
 125 #undef  PSEUDO_END_NOERRNO
 126 #define PSEUDO_END_NOERRNO(name)                                              \
 127   END (name)
 128
 129 #define PSEUDO_ERRVAL(name, syscall_name, args)                               \
 130   .section ".text";                                                           \
 131   ENTRY (name)                                                                \
 132     DO_CALL (SYS_ify (syscall_name));
 133
 134 #define PSEUDO_RET_ERRVAL                                                     \
 135     blr
 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__ */