sysdeps/powerpc/powerpc32/sysdep.h

   1 /* Assembly macros for 32-bit PowerPC.
   2    Copyright (C) 1999, 2001, 2002 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 #ifdef __ASSEMBLER__
  21
  22 #include <sysdeps/powerpc/sysdep.h>
  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 #ifdef PIC
  33 #define CALL_MCOUNT                                                           \
  34   .pushsection;                                                               \
  35   .section ".data";                                                           \
  36   .align ALIGNARG(2);                                                         \
  37 0:.long 0;                                                                    \
  38   .previous;                                                                  \
  39   mflr  r0;                                                                   \
  40   stw   r0,4(r1);                                                             \
  41   bl    _GLOBAL_OFFSET_TABLE_@local-4;                                        \
  42   mflr  r11;                                                                  \
  43   lwz   r0,0b@got(r11);                                                       \
  44   bl    JUMPTARGET(_mcount);
  45 #else  /* PIC */
  46 #define CALL_MCOUNT                                                           \
  47   .section ".data";                                                           \
  48   .align ALIGNARG(2);                                                         \
  49 0:.long 0;                                                                    \
  50   .previous;                                                                  \
  51   mflr  r0;                                                                   \
  52   lis   r11,0b@ha;                                                            \
  53   stw   r0,4(r1);                                                             \
  54   addi  r0,r11,0b@l;                                                          \
  55   bl    JUMPTARGET(_mcount);
  56 #endif /* PIC */
  57 #else  /* PROF */
  58 #define CALL_MCOUNT             /* Do nothing.  */
  59 #endif /* PROF */
  60
  61 #define ENTRY(name)                                                           \
  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   CALL_MCOUNT
  67
  68 #define EALIGN_W_0  /* No words to insert.  */
  69 #define EALIGN_W_1  nop
  70 #define EALIGN_W_2  nop;nop
  71 #define EALIGN_W_3  nop;nop;nop
  72 #define EALIGN_W_4  EALIGN_W_3;nop
  73 #define EALIGN_W_5  EALIGN_W_4;nop
  74 #define EALIGN_W_6  EALIGN_W_5;nop
  75 #define EALIGN_W_7  EALIGN_W_6;nop
  76
  77 /* EALIGN is like ENTRY, but does alignment to 'words'*4 bytes
  78    past a 2^align boundary.  */
  79 #ifdef PROF
  80 #define EALIGN(name, alignt, words)                                           \
  81   ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);                                   \
  82   ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)                          \
  83   .align ALIGNARG(2);                                                         \
  84   C_LABEL(name)                                                               \
  85   CALL_MCOUNT                                                                 \
  86   b 0f;                                                                       \
  87   .align ALIGNARG(alignt);                                                    \
  88   EALIGN_W_##words;                                                           \
  89   0:
  90 #else /* PROF */
  91 #define EALIGN(name, alignt, words)                                           \
  92   ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);                                   \
  93   ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)                          \
  94   .align ALIGNARG(alignt);                                                    \
  95   EALIGN_W_##words;                                                           \
  96   C_LABEL(name)
  97 #endif
  98
  99 #undef  END
 100 #define END(name)                                                             \
 101   ASM_SIZE_DIRECTIVE(name)
 102
 103 #define DO_CALL(syscall)                                                      \
 104     li 0,syscall;                                                             \
 105     sc
 106
 107 #ifdef PIC
 108 #define JUMPTARGET(name) name##@plt
 109 #else
 110 #define JUMPTARGET(name) name
 111 #endif
 112
 113 #define PSEUDO(name, syscall_name, args)                                      \
 114   .section ".text";                                                           \
 115   ENTRY (name)                                                                \
 116     DO_CALL (SYS_ify (syscall_name));
 117
 118 #define PSEUDO_RET                                                            \
 119     bnslr;                                                                    \
 120     b JUMPTARGET(__syscall_error)
 121 #define ret PSEUDO_RET
 122
 123 #undef  PSEUDO_END
 124 #define PSEUDO_END(name)                                                      \
 125   END (name)
 126
 127 /* Local labels stripped out by the linker.  */
 128 #undef L
 129 #define L(x) .L##x
 130
 131 /* Label in text section.  */
 132 #define C_TEXT(name) name
 133
 134 #endif /* __ELF__ */
 135
 136 #endif  /* __ASSEMBLER__ */