sysdeps/powerpc/powerpc32/sysdep.h

   1 /* Assembly macros for 32-bit PowerPC.
   2    Copyright (C) 1999, 2001, 2002, 2003 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., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <sysdeps/powerpc/sysdep.h>
  21
  22 #ifdef __ASSEMBLER__
  23
  24 #ifdef __ELF__
  25
  26 /* If compiled for profiling, call `_mcount' at the start of each
  27    function.  */
  28 #ifdef  PROF
  29 /* The mcount code relies on a the return address being on the stack
  30    to locate our caller and so it can restore it; so store one just
  31    for its benefit.  */
  32 # define CALL_MCOUNT                                                          \
  33   mflr  r0;                                                                   \
  34   stw   r0,4(r1);                                                             \
  35   bl    JUMPTARGET(_mcount);
  36 #else  /* PROF */
  37 # define CALL_MCOUNT            /* Do nothing.  */
  38 #endif /* PROF */
  39
  40 #define ENTRY(name)                                                           \
  41   ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);                                   \
  42   ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)                          \
  43   .align ALIGNARG(2);                                                         \
  44   C_LABEL(name)                                                               \
  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   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 #endif
  77
  78 #undef  END
  79 #define END(name)                                                             \
  80   ASM_SIZE_DIRECTIVE(name)
  81
  82 #define DO_CALL(syscall)                                                      \
  83     li 0,syscall;                                                             \
  84     sc
  85
  86 #undef JUMPTARGET
  87 #ifdef PIC
  88 # define JUMPTARGET(name) name##@plt
  89 #else
  90 # define JUMPTARGET(name) name
  91 #endif
  92
  93 #if defined SHARED && defined DO_VERSIONING && defined PIC \
  94     && !defined HAVE_BROKEN_ALIAS_ATTRIBUTE && !defined NO_HIDDEN
  95 # undef HIDDEN_JUMPTARGET
  96 # define HIDDEN_JUMPTARGET(name) __GI_##name##@local
  97 #endif
  98
  99 #define PSEUDO(name, syscall_name, args)                                      \
 100   .section ".text";                                                           \
 101   ENTRY (name)                                                                \
 102     DO_CALL (SYS_ify (syscall_name));
 103
 104 #define PSEUDO_RET                                                            \
 105     bnslr+;                                                                   \
 106     b __syscall_error@local
 107 #define ret PSEUDO_RET
 108
 109 #undef  PSEUDO_END
 110 #define PSEUDO_END(name)                                                      \
 111   END (name)
 112
 113 #define PSEUDO_NOERRNO(name, syscall_name, args)                              \
 114   .section ".text";                                                           \
 115   ENTRY (name)                                                                \
 116     DO_CALL (SYS_ify (syscall_name));
 117
 118 #define PSEUDO_RET_NOERRNO                                                    \
 119     blr
 120 #define ret_NOERRNO PSEUDO_RET_NOERRNO
 121
 122 #undef  PSEUDO_END_NOERRNO
 123 #define PSEUDO_END_NOERRNO(name)                                              \
 124   END (name)
 125
 126 #define PSEUDO_ERRVAL(name, syscall_name, args)                               \
 127   .section ".text";                                                           \
 128   ENTRY (name)                                                                \
 129     DO_CALL (SYS_ify (syscall_name));
 130
 131 #define PSEUDO_RET_ERRVAL                                                     \
 132     blr
 133 #define ret_ERRVAL PSEUDO_RET_ERRVAL
 134
 135 #undef  PSEUDO_END_ERRVAL
 136 #define PSEUDO_END_ERRVAL(name)                                               \
 137   END (name)
 138
 139 /* Local labels stripped out by the linker.  */
 140 #undef L
 141 #define L(x) .L##x
 142
 143 /* Label in text section.  */
 144 #define C_TEXT(name) name
 145
 146 #endif /* __ELF__ */
 147
 148 #endif  /* __ASSEMBLER__ */