sysdeps/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 #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   cfi_offset (lr, 4);                                                         \
  36   bl    JUMPTARGET(_mcount);
  37 #else  /* PROF */
  38 # define CALL_MCOUNT            /* Do nothing.  */
  39 #endif /* PROF */
  40
  41 #define ENTRY(name)                                                           \
  42   ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);                                   \
  43   ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)                          \
  44   .align ALIGNARG(2);                                                         \
  45   C_LABEL(name)                                                               \
  46   cfi_startproc;                                                              \
  47   CALL_MCOUNT
  48
  49 #define EALIGN_W_0  /* No words to insert.  */
  50 #define EALIGN_W_1  nop
  51 #define EALIGN_W_2  nop;nop
  52 #define EALIGN_W_3  nop;nop;nop
  53 #define EALIGN_W_4  EALIGN_W_3;nop
  54 #define EALIGN_W_5  EALIGN_W_4;nop
  55 #define EALIGN_W_6  EALIGN_W_5;nop
  56 #define EALIGN_W_7  EALIGN_W_6;nop
  57
  58 /* EALIGN is like ENTRY, but does alignment to 'words'*4 bytes
  59    past a 2^align boundary.  */
  60 #ifdef PROF
  61 # define EALIGN(name, alignt, words)                                          \
  62   ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);                                   \
  63   ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)                          \
  64   .align ALIGNARG(2);                                                         \
  65   C_LABEL(name)                                                               \
  66   cfi_startproc;                                                              \
  67   CALL_MCOUNT                                                                 \
  68   b 0f;                                                                       \
  69   .align ALIGNARG(alignt);                                                    \
  70   EALIGN_W_##words;                                                           \
  71   0:
  72 #else /* PROF */
  73 # define EALIGN(name, alignt, words)                                          \
  74   ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);                                   \
  75   ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)                          \
  76   .align ALIGNARG(alignt);                                                    \
  77   EALIGN_W_##words;                                                           \
  78   C_LABEL(name)                                                               \
  79   cfi_startproc;
  80 #endif
  81
  82 #undef  END
  83 #define END(name)                                                             \
  84   cfi_endproc;                                                                \
  85   ASM_SIZE_DIRECTIVE(name)
  86
  87 #define DO_CALL(syscall)                                                      \
  88     li 0,syscall;                                                             \
  89     sc
  90
  91 #undef JUMPTARGET
  92 #ifdef PIC
  93 # define JUMPTARGET(name) name##@plt
  94 #else
  95 # define JUMPTARGET(name) name
  96 #endif
  97
  98 #if defined SHARED && defined DO_VERSIONING && defined PIC \
  99     && !defined NO_HIDDEN
 100 # undef HIDDEN_JUMPTARGET
 101 # define HIDDEN_JUMPTARGET(name) __GI_##name##@local
 102 #endif
 103
 104 #define PSEUDO(name, syscall_name, args)                                      \
 105   .section ".text";                                                           \
 106   ENTRY (name)                                                                \
 107     DO_CALL (SYS_ify (syscall_name));
 108
 109 #define PSEUDO_RET                                                            \
 110     bnslr+;                                                                   \
 111     b __syscall_error@local
 112 #define ret PSEUDO_RET
 113
 114 #undef  PSEUDO_END
 115 #define PSEUDO_END(name)                                                      \
 116   END (name)
 117
 118 #define PSEUDO_NOERRNO(name, syscall_name, args)                              \
 119   .section ".text";                                                           \
 120   ENTRY (name)                                                                \
 121     DO_CALL (SYS_ify (syscall_name));
 122
 123 #define PSEUDO_RET_NOERRNO                                                    \
 124     blr
 125 #define ret_NOERRNO PSEUDO_RET_NOERRNO
 126
 127 #undef  PSEUDO_END_NOERRNO
 128 #define PSEUDO_END_NOERRNO(name)                                              \
 129   END (name)
 130
 131 #define PSEUDO_ERRVAL(name, syscall_name, args)                               \
 132   .section ".text";                                                           \
 133   ENTRY (name)                                                                \
 134     DO_CALL (SYS_ify (syscall_name));
 135
 136 #define PSEUDO_RET_ERRVAL                                                     \
 137     blr
 138 #define ret_ERRVAL PSEUDO_RET_ERRVAL
 139
 140 #undef  PSEUDO_END_ERRVAL
 141 #define PSEUDO_END_ERRVAL(name)                                               \
 142   END (name)
 143
 144 /* Local labels stripped out by the linker.  */
 145 #undef L
 146 #define L(x) .L##x
 147
 148 /* Label in text section.  */
 149 #define C_TEXT(name) name
 150
 151 #endif /* __ELF__ */
 152
 153 #endif  /* __ASSEMBLER__ */