sysdeps/powerpc/powerpc32/sysdep.h

   1 /* Assembly macros for 32-bit PowerPC.
   2    Copyright (C) 1999, 2001-2003, 2006, 2011-2012
   3         Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA
  19    02110-1301 USA.  */
  20
  21 #include <sysdeps/powerpc/sysdep.h>
  22
  23 #ifdef __ASSEMBLER__
  24
  25 /* If compiled for profiling, call `_mcount' at the start of each
  26    function.  */
  27 #ifdef  PROF
  28 /* The mcount code relies on a the return address being on the stack
  29    to locate our caller and so it can restore it; so store one just
  30    for its benefit.  */
  31 # define CALL_MCOUNT                                                          \
  32   mflr  r0;                                                                   \
  33   stw   r0,4(r1);                                                             \
  34   cfi_offset (lr, 4);                                                         \
  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   cfi_startproc;                                                              \
  46   CALL_MCOUNT
  47
  48 /* helper macro for accessing the 32-bit powerpc GOT. */
  49
  50 #define SETUP_GOT_ACCESS(regname,GOT_LABEL)                                   \
  51         bcl     20,31,GOT_LABEL ;                                             \
  52 GOT_LABEL:                      ;                                             \
  53         mflr    (regname)
  54
  55 #define EALIGN_W_0  /* No words to insert.  */
  56 #define EALIGN_W_1  nop
  57 #define EALIGN_W_2  nop;nop
  58 #define EALIGN_W_3  nop;nop;nop
  59 #define EALIGN_W_4  EALIGN_W_3;nop
  60 #define EALIGN_W_5  EALIGN_W_4;nop
  61 #define EALIGN_W_6  EALIGN_W_5;nop
  62 #define EALIGN_W_7  EALIGN_W_6;nop
  63
  64 /* EALIGN is like ENTRY, but does alignment to 'words'*4 bytes
  65    past a 2^align boundary.  */
  66 #ifdef PROF
  67 # define EALIGN(name, alignt, words)                                          \
  68   ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);                                   \
  69   ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)                          \
  70   .align ALIGNARG(2);                                                         \
  71   C_LABEL(name)                                                               \
  72   cfi_startproc;                                                              \
  73   CALL_MCOUNT                                                                 \
  74   b 0f;                                                                       \
  75   .align ALIGNARG(alignt);                                                    \
  76   EALIGN_W_##words;                                                           \
  77   0:
  78 #else /* PROF */
  79 # define EALIGN(name, alignt, words)                                          \
  80   ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);                                   \
  81   ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)                          \
  82   .align ALIGNARG(alignt);                                                    \
  83   EALIGN_W_##words;                                                           \
  84   C_LABEL(name)                                                               \
  85   cfi_startproc;
  86 #endif
  87
  88 #undef  END
  89 #define END(name)                                                             \
  90   cfi_endproc;                                                                \
  91   ASM_SIZE_DIRECTIVE(name)
  92
  93 #define DO_CALL(syscall)                                                      \
  94     li 0,syscall;                                                             \
  95     sc
  96
  97 #undef JUMPTARGET
  98 #ifdef PIC
  99 # define JUMPTARGET(name) name##@plt
 100 #else
 101 # define JUMPTARGET(name) name
 102 #endif
 103
 104 #if defined SHARED && defined DO_VERSIONING && defined PIC \
 105     && !defined NO_HIDDEN
 106 # undef HIDDEN_JUMPTARGET
 107 # define HIDDEN_JUMPTARGET(name) __GI_##name##@local
 108 #endif
 109
 110 #define PSEUDO(name, syscall_name, args)                                      \
 111   .section ".text";                                                           \
 112   ENTRY (name)                                                                \
 113     DO_CALL (SYS_ify (syscall_name));
 114
 115 #define PSEUDO_RET                                                            \
 116     bnslr+;                                                                   \
 117     b __syscall_error@local
 118 #define ret PSEUDO_RET
 119
 120 #undef  PSEUDO_END
 121 #define PSEUDO_END(name)                                                      \
 122   END (name)
 123
 124 #define PSEUDO_NOERRNO(name, syscall_name, args)                              \
 125   .section ".text";                                                           \
 126   ENTRY (name)                                                                \
 127     DO_CALL (SYS_ify (syscall_name));
 128
 129 #define PSEUDO_RET_NOERRNO                                                    \
 130     blr
 131 #define ret_NOERRNO PSEUDO_RET_NOERRNO
 132
 133 #undef  PSEUDO_END_NOERRNO
 134 #define PSEUDO_END_NOERRNO(name)                                              \
 135   END (name)
 136
 137 #define PSEUDO_ERRVAL(name, syscall_name, args)                               \
 138   .section ".text";                                                           \
 139   ENTRY (name)                                                                \
 140     DO_CALL (SYS_ify (syscall_name));
 141
 142 #define PSEUDO_RET_ERRVAL                                                     \
 143     blr
 144 #define ret_ERRVAL PSEUDO_RET_ERRVAL
 145
 146 #undef  PSEUDO_END_ERRVAL
 147 #define PSEUDO_END_ERRVAL(name)                                               \
 148   END (name)
 149
 150 /* Local labels stripped out by the linker.  */
 151 #undef L
 152 #define L(x) .L##x
 153
 154 #define XGLUE(a,b) a##b
 155 #define GLUE(a,b) XGLUE (a,b)
 156 #define GENERATE_GOT_LABEL(name) GLUE (.got_label, name)
 157
 158 /* Label in text section.  */
 159 #define C_TEXT(name) name
 160
 161 #endif  /* __ASSEMBLER__ */